KR102003155B1 - Manufacturing method of paste-layer-attached sheet and coating applicator - Google Patents

Abstract

In forming the paste layer 6 on the substrate sheet 2 by using the three rolls 11, 12 and 13 arranged at right angles, the amount of variation (the number of turns) of the first gap KG1 The first sensor 21 for detecting the coating film surface 5s of the second roll top film 5 of the second roll and the second sensor 21 for detecting the second roll surface 12s The variation amount? G1 in the detection period DT (n) is calculated using the outputs PR5s and PR12s of the first rolls 22 and 22 and the first roll is moved using the first roll movement mechanism 25 .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a sheet having a paste layer,

The present invention relates to a method for producing a sheet having a belt-like paste layer on which a belt-like paste layer is formed on a belt-like base sheet, and a coating apparatus used for the production.

As an electrode plate (positive electrode plate or negative electrode plate) in the form of a strip used for a battery, an electrode plate in which a strip-shaped active material layer including active material particles and a binder is formed on a current collector foil is known. Such an electrode plate is manufactured, for example, by the following method. That is, an active material paste in which active material particles and a binder are dispersed in a solvent is prepared. And a second roll disposed parallel to the first roll through a first gap and a third roll disposed parallel to the second roll through a second gap, . Then, the active material paste is supplied to the first gap between the first roll and the second roll, and the non-dried film is formed on the second roll. Subsequently, the film is transferred onto a current collecting foil passed through a second gap between the second roll and the third roll, and the non-dried active material layer is applied to the current collecting foil. Thereafter, the non-dried active material layer on the current collector foil is dried to form an active material layer. Such a manufacturing method is disclosed, for example, in Japanese Laid-Open Patent Publication No. 2016-152169.

However, if the non-dried active material layer (paste layer) is continuously formed on the long strip-shaped current collector foil (base sheet) by the coating apparatus as described above, the first gap, the frictional heat generated in the vicinity of the second gap, And the size (radius) of each roll gradually increases due to thermal expansion. Then, as the radiuses of the first roll and the second roll become larger, the size of the first gap becomes smaller, and the thickness of the non-dried film (the second roll top film (upper coating film)) formed on the second roll becomes thinner . Therefore, the thickness and density of the non-dried active material layer (paste layer) formed on the current collector foil (base sheet) fluctuate.

The present invention provides a method for producing a sheet having a paste layer on which fluctuations due to thermal expansion of each roll of a paste layer formed on a base sheet are suppressed, and a coating device used for the production.

According to one aspect of the present invention, there is provided a method of producing a sheet having a belt-like paste layer formed by forming a belt-like paste layer on a strip-shaped base sheet, the method comprising: a first roll; A second roll which is arranged in parallel through a gap and rotates in a second roll rotation direction opposite to the first roll and a second roll which is arranged in parallel with the second roll via a second gap, The first roll, the second roll, and the third roll rotate in a direction opposite to the roll and convey the substrate sheet that has passed through the second gap, A second imaginary plane connecting the roll center axis and the first roll center axis of the first roll and a second imaginary plane connecting the second roll center axis of the second roll and the third roll center axis of the third roll, In the form of being orthogonal to the central axis of the second roll, And the second gap is formed on a portion of the second roll surface of the second roll from the first gap in the direction of the fourth roll rotation in the second roll rotation direction, Wherein the second roll surface is moved from the first gap to the second roll surface in the second roll rotation direction by a first angle advancement larger than 0 DEG and smaller than 90 DEG from among the coating surface of the second roll over film comprising the paste applied to the roll surface A first sensor for detecting a first radial position of the coating film surface of the second roll top film at a first angular position and a second sensor for detecting a position of the second roll top film in the first radial direction, And a second roll position detecting means for detecting a position in the second radial direction of the second roll surface at a second angular position which is 180 degrees from the first angular position in the second roll rotational direction, 2 sensor, A first roll moving mechanism configured to move the first roll in a first direction connecting the second roll and the first roll is used and the paste is supplied to the first gap, 2 transferring the second roll topcoat applied on the roll surface through the second gap to the base sheet conveying the third roll to form the paste layer on the base sheet, And a second roll position detecting means for detecting a roll position of the first roll and the second roll from the first radial position detected by the sensor and the second radial position detected by the second sensor, Detecting an amount of variation in the gap dimension of the first gap that occurs at each of the detection periods and using the first roll movement mechanism so as to cancel the fluctuation amount of the detected gap, The first roll is moved in the first direction, the movement of the first roll by the first roll moving mechanism is completed after the last detection period is completed, And starting detection in the new detection period after the second roll rotation time for rotating by the first angle has elapsed.

In the above-described method for producing a sheet with a paste layer, a coating apparatus in which first rolls and third rolls are arranged around a second roll is used. In this coating apparatus, even if the first roll is moved in the first direction in order to adjust the gap dimension of the first gap, the gap dimension of the second gap located in the second direction orthogonal to the first gap is hardly affected. Therefore, the first roll can be moved without considering the influence on the second gap. It is also understood that the thickness of the second roll top film is the same as the size of the first gap at the time of forming the second roll top film. Thus, in the detection step, the first sensor and the second sensor arranged as described above are used to detect the fluctuation amount of the first gap due to the thermal expansion of the first roll and the second roll generated in the detection period during the detection period And when the first roll is moved, the first roll is moved in the first direction so as to cancel the fluctuation amount of the detected first gap by using the first roll moving mechanism. Thus, the fluctuation of the thickness of the second rolled film caused by the variation of the first gap can be removed every detection period, and accumulation of fluctuation of the first gap can be prevented. Thus, according to this manufacturing method, the influence of the thermal expansion of the first roll and the second roll on the thickness and density of the paste layer formed on the base sheet is suppressed, It is possible to produce a sheet with a paste layer on which fluctuation of the paste layer is suppressed.

The first roll movement mechanism completes the movement of the first roll after the last detection period ends and then the second roll rotates by the first angle rotation This was done after the elapse of the 2 roll rotation time. By doing so, after the first gap becomes a new size by the movement of the first roll and the second roll top film formed by the first gap of the new gap dimension can be detected by the first sensor, Since the next detection period is started, the output of the first sensor can be used from the beginning of the detection period.

The radial position of the surface of the second roll and the surface of the coating film of the second roll top film formed on the second roll refers to a position in the radial direction of the second roll with respect to the second roll central axis. The first sensor and the second sensor are displacement sensors for detecting the radial position of the film surface or the second roll surface of the second roll top film. For example, the film thickness of the film surface of the second roll top film or the diameter It is possible to use a displacement meter such as a capacitance type, optical type or laser type which can detect the direction position in a noncontact manner. In these sensors, for example, in a state in which thermal expansion has not occurred in each roll before the paste is supplied to the first gap (the state where the paste is not applied to the second roll surface) The position of the film surface of the second roll top film or the position of the second roll surface in the radial direction may be detected on the basis of the radial position of the second roll surface before the start of production of the sheet.

The first angular position at which the first sensor detects the radial position of the coating surface of the second roll top coat is a position at which the first gap rotates on the second roll surface in the second roll rotation direction at the first angle? , and θ1 = 0 to 90 °. Preferably, the first angle? 1 may be selected in the range of? 1 = 25 to 65 占 and further in the range of? 1 = 40 to 50 占. This is because it is easy to arrange the first sensor between the first roll and the third roll and without interfering with them. As described above, the second sensor has a second angular position, that is, a second angular position that advances 180 degrees from the first angular position to the second roll rotational direction, that is, the second angular position, And detects the position of the second roll surface in the second roll diameter direction at the second angular position on the exactly opposite side sandwiching the center shaft therebetween.

Therefore, for example, the thickness of the second rolled top film can be detected from the radial position of the coated film surface of the second rolled top film detected by the output of the first sensor. In addition, it is possible to detect the fluctuation amount of the thickness of the second rolled film formed in the detection period and thus the fluctuation amount of the gap size of the first gap from the change of the output of the first sensor and the second sensor generated within the detection period.

More specifically, an example will be described.

The fluctuation amount of the radius (R1) of the first roll generated in any detection period:? R1,

A variation amount? R2 of the radius (R2) of the second roll generated during the detection period,

The variation amount of the first gap KG1 generated during the detection period:? G1,

The variation amount of the first radial position (PR5s) of the coating film surface of the second roll top film detected by the first sensor generated in the detection period: DELTA PR5s,

And the variation amount DELTA PR12s of the second radial position (PR12s) of the second roll surface detected by the second sensor generated during the detection period.

Here, it can be seen that the thickness of the second roll top film formed on the second roll surface is the same as the gap size of the first gap at the time of forming the second roll top film. From this, it can be seen that the amount of variation in the thickness of the second roll top film that occurs during any detection period (from the detection period to the end of the detection period) is the same as the variation amount of the gap size of the first gap in the detection period do.

During the detection period, when the radius (R2) of the second roll is expanded by the variation amount (DELTA R2) by the thermal expansion, the second radial position (PR12s) of the second roll surface detected by the second sensor also moves outside the diameter. More specifically, the fluctuation amount changes by the variation amount? PR 12s =? R 2. That is, in the second sensor, it is possible to detect the variation amount? R2 of the radius R2 due to the thermal expansion of the second roll. On the other hand, in the first sensor, the first radial position (PR5s) of the coating film surface of the second roll top film is detected. The first radial position PR5s of the film surface of the second roll top film is a position obtained by adding the thickness of the second roll top film to the radius R2 of the second roll and thus the radius R2 of the second roll And the gap dimension G1 of the first gap. This corresponds to the radial position of the first roll surface of the first roll in the first gap. Therefore, when the radius R1 of the first roll is increased by the amount of change DELTA R1 due to thermal expansion, the first radial position PR5s of the film surface of the second roll top film detected by the second sensor is reduced To the center side). That is, the variation amount? PR5s of the first radial position (PR5s) detected by the first sensor is a half of the variation amount? R1 of the radius (R1) due to the thermal expansion of the first roll generated in the detection period, (? PR5s = -ΔR1). The clearance dimension G1 of the first clearance can be determined by ignoring the movement of the first roll center axis and the second roll center axis in the detection period, Min. That is, the variation amount? G1 of the gap dimension G1 corresponds to half the sum of the variation amounts? R1 and? R2 of the radii R1 and R2 generated in the first and second rolls (? G1 = - (? R1 +? R2 )). Therefore, the variation amount? G1 of the gap dimension G1 can be detected from the variation amount? PR5s detected by the first sensor and the variation amount? PR12s detected by the second sensor.

As the detection period, for example, a detection period that is divided every predetermined time (for example, every minute) can be used. At the beginning of the coating apparatus, the detection period is relatively short (for example, every 5 minutes) after a period of time elapsing from the start and a gradual increase of the thermal expansion, You may. When the variation of the first gap from the detection period exceeds the predetermined value, the detection period may be terminated and the next detection period may be started after the first roll movement process and adjustment process .

The "paste" is a coating material obtained by mixing a solute (for example, active material particles and a binder) and a solvent, and includes a coating material composed of a plurality of wet assembly (granulated particles). Here, the wet assembly refers to a substance (a granular substance) in which the solvent is held (absorbed) by the particles of the solute and aggregated (bound) with the solvent. The wet assembly includes, for example, a mixture of active material particles, a binder and a solvent. This wet assembly is a substance (grains) formed by aggregating (binding) the solvent in a state where the solvent is held (absorbed) in the active material particles and the binder.

The method of manufacturing a sheet with a paste layer according to any one of the preceding claims, wherein the variation of the first gap generated within the detection period by the thermal expansion is detected by the first sensor From the difference between the variation in the first radial position of the coating film surface of the film and the variation in the second radial position of the second roll surface of the second roll detected by the second sensor, May be used.

In the production method of the sheet having the paste layer, the amount of change in the gap dimension of the first gap generated within the detection period is calculated by calculating the amount of change in the first radial direction position PR5s of the coating film surface of the second roll top film, And the variation amount DELTA PR12s of the second radial position PR12s of the second roll surface of the second roll are obtained from the difference between the difference DELTA PR5s of the first gap and the variation amount DELTA PR12s of the second radial position PR12s of the second roll, . In other words, the variation amount? G1 of the gap dimension G1 can be easily obtained from the difference between the variation amount? PM5s and the variation amount? PR12s since? G1 = - (? R1 +? R2) =?

In the above-described method for producing a sheet with a paste layer, it is preferable that the first sensor is arranged so that, at the first angular position measured by the first sensor before the supply of the paste to the first gap is started Is a sensor for detecting the first radial position of the coating film surface with the first radial position before start of the second roll surface of the second roll surface as a reference position, Of the second roll surface with the second radial position before the start of the second roll surface at the second angular position measured by the second sensor before starting the supply of the second roll surface Wherein the sensor is a sensor for measuring a second radial position, and at the start of the first detection period of the detection period which is repeatedly formed, from the time when supply of the paste is started to the first gap, Before the second roll is rotated by more than the first angle and before the second roll is rotated a predetermined number of times by the first sensor, the first pre-start radial position to the reference position Wherein the second roll surface is formed by measuring a first initial radial position of the coating film surface of the second roll top film and a second initial position of the second roll surface with the second pre- Measuring the initial second radial position and measuring the initial first radial position and the initial second radial position and at the end of each of the sensing periods, Measuring a first radial position at the end of the coating surface of the second roll top coat with a first radial position as a reference position and measuring a second radial position before the first radial position by the second sensor, To , Measuring a second radial position at the end of the second roll surface and determining a value of the variation of the first gap occurring within each sensing period by the thermal expansion, (L12 - L22), where L11 is a value of the initial radial position, L21 is a value of the initial second radial position, L12 is a value of the first radial position at the end, and L22 is a value of the second radial position at the end. - (L11 - L21).

When the supply of the paste to the first gap is started and processing for forming a film (coating film formation) is started while compressing the paste between the first roll and the second roll, the processing reaction force (reaction force The reaction force of the compressive force acting on the paste when forming the film while compressing the paste between the two rolls) acts on the first roll and the second roll. Immediately after the start of machining, a large machining reaction force is suddenly applied to the first roll and the second roll, so that the first gap between the first roll and the second roll is enlarged by the machining reaction force, (The rotational axis of the first roll is displaced in the direction away from the second roll, and the rotational axis of the second roll is displaced in the direction away from the first roll). Particularly, when a coating material composed of a wet assembly having a high solid content (a small amount of a solvent) is used as a paste, the processing reaction force becomes large, and positional shifts of the first roll and the second roll are likely to occur. Thus, the gap dimension of the first gap between the first roll and the second roll varies.

Further, the first roll and the second roll thermally expand due to the frictional heat generated in the vicinity of the first gap when the processing is started while forming the film while compressing the paste between the first roll and the second roll. Particularly, when a coating material composed of a wet assembly having a high solid content (a small amount of solvent) is used as the paste, the amount of frictional heat generated increases and thermal expansion of the first and second rolls is likely to occur. This thermal expansion also changes the gap dimension of the first gap between the first roll and the second roll.

Incidentally, the positional deviation of the first roll and the second roll due to the processing reaction force occurs mostly immediately after the start of machining (for example, from the start of machining to the first rotation of the second roll) (For example, when the number of revolutions of the second roll exceeds 30 rotations calculated from the start of machining) at the time of occurrence of thermal expansion of the first roll and the second roll (for example, Is a positional deviation of a certain degree). Therefore, after the gap dimension of the first gap changes with the positional deviation of the first roll and the second roll due to the processing reaction force, the gap size of the first gap with the thermal expansion of the first roll and the second roll becomes Can be thought of as fluctuating.

Thus, in the manufacturing method described above, the first gap (before thermal expansion of the first roll and the second roll) after the first gap changes due to the positional deviation of the first roll and the second roll due to the processing reaction force, The gap dimension of the first gap is set as the gap dimension of the target first gap (the first gap target value), and then, during the detection period, the gap dimension of the first gap is changed from the first gap target value, The fluctuation amount that was caused by the thermal expansion of the second roll was calculated as the variation amount? G1. Then, in the first roll moving step, the gap size of the first gap is adjusted to the first gap target value by moving the first roll so as to cancel out this variation amount? G1.

That is, in the manufacturing method described above, the first gap (before the first roll and the second roll do not thermally expand) after the first gap varies due to the positional deviation of the first roll and the second roll due to the processing reaction force, (The first gap target value), and feedback control is performed so that the gap dimension of the first gap becomes the first gap target value during the manufacturing period. By doing so, the thickness of the coating film formed between the first roll and the second roll can be set to the first gap target value or a dimension close to the first gap target throughout the manufacturing period.

More specifically, in the above-described manufacturing method, in the first initial detection step (first initial detection step) included in the detection step, from the time when the supply of the paste to the first gap is started, the second roll The initial first radial position and the initial second radial position are measured by the first sensor and the second sensor before the second roll has rotated a predetermined number of rotations by more than the first angle? do. More specifically, it is preferable that, as the radial position of the coating surface of the second roll top coat, the first sensor detects, as a position in the radial direction of the coating film surface of the second roll top coat, (That is, the initial radial position before starting, that is, the reference position, the initial radial position before start of the second roll surface at the reference position The second roll diameter direction distance from the second roll).

Further, it is preferable that, as the radial position of the second roll surface of the second roll by the second sensor, " before the supply of the paste to the first gap is started, at the second angular position measured by the second sensor (That is, the initial initial radial position of the second roll surface in the reference position (zero reference)), that is, the initial second radial position of the second roll surface of the second roll 2 < / RTI > radial distance from the radial position) is measured.

When the second roll is rotated by the first angle? 1, the leading end of the second roll top film (the leading end of the second roll in the circumferential direction) , &Quot; the first sensor reaches the first angular position for detecting the radial position of the film surface of the second roll top film ". It is also possible that no thermal expansion occurs or thermal expansion occurs in the first roll and the second roll until the second roll is rotated by a predetermined number of rotations since the supply of the paste is started to the first gap However, the amount of expansion is very small and negligible.

Therefore, when measuring the initial first radial position and the initial second radial position described above, the L11 measured by the first sensor is a deviation of the position of the first roll and the second roll due to the processing reaction force After the first gap has changed and the first roll and the second roll have been subjected to thermal expansion (or even when thermal expansion has occurred, the amount of expansion is negligible and negligible) (In other words, the second roll diameter direction distance from the first radial position before start, which is the reference position).

The L21 measured by the second sensor in the above-described first initial detection process is the one after the first gap fluctuates following the positional deviation of the first roll and the second roll due to the processing reaction force, (That is, the second position of the second roll before the thermal expansion of the second roll, that is, when the thermal expansion has occurred, the amount of expansion is negligibly small) The second roll radial distance from the radial position).

In addition, in the above-described manufacturing method, after the initial first radial position and the initial second radial position are measured, at the end of each of the detection periods, the first sensor and the second sensor determine, One radial position and a second radial position at the end are measured.

Specifically, by the first sensor, the radial position of the coating surface of the second roll top coat is set to the first radial position at the end of the coating film surface with the first radial position before the start as the reference position (zero reference) (In other words, the second roll diameter direction distance from the first radial position before start, which is the reference position).

Further, by the second sensor, at the end of the second roll surface of the second roll, in which the second radial position before the start is set as the reference position (zero reference) as the radial position of the second roll surface of the second roll, The second radial position (in other words, the second roll radial distance from the second pre-start radial position as the reference position) is measured.

Further, it is considered that the first roll and the second roll are thermally expanded not so much at the end of each detection period after measuring the initial first radial position and the initial second radial position. Therefore, L12 measured by the first sensor in the detecting process at the end of the first period is after the first gap changes due to the positional deviation of the first roll and the second roll due to the processing reaction force, (That is, the second roll diameter direction distance from the first radial position before the start, which is the reference position) of the coating film surface of the second roll top film after thermal expansion of the roll and the second roll.

The L22 measured by the second sensor is a value obtained after the first gap fluctuates following the positional deviation of the first roll and the second roll due to the processing reaction force and the first roll and the second roll are thermally expanded (In other words, the second roll diameter direction distance from the second pre-start radial position which is the reference position) of the second roll surface. Further, in the above-described manufacturing method, ΔG1, which is a variation amount of the first gap generated within each sensing period by the thermal expansion, is calculated by using the relational expression ΔG1 = (L12-L22) - (L11-L21).

The above relational expression is derived as follows. First, the set value of the gap dimension of the first gap (the gap dimension of the first gap before starting manufacturing) is G1S. Further, the positional shift amount of the first roll that is moved (displaced) in the first direction by the processing reaction force is defined as DELTA X1. Further, the increase amount of the radius due to the thermal expansion of the first roll is defined as DELTA R1. Further, the positional shift amount of the second roll that moves (displaces) in the first direction by the processing reaction force is defined as DELTA X2. Further, the positional shift amount of the second roll that moves (displaces) in the second direction due to the processing reaction force generated between the second roll and the third roll is defined as DELTA Y2. Further, the increase amount of the radius due to thermal expansion of the second roll is defined as DELTA R2.

With the above-described setting, the gap dimension G1 of the first gap when measuring L11 and L21 in the first initial detection step is G1 = G1S + DELTA X1 + DELTA X2 ... (Equation 1).

Further, L11 =? X2 cos? 1 +? Y2 sin? (Formula 2).

In addition, L21 = -ΔX2 cos θ1 - ΔY2 sin θ1 - G1 = - ΔX2 cos θ1 - ΔY2 sin θ1 - (G1S + ΔX1 + ΔX2) (Equation 3).

The gap dimension G1 of the first gap when measuring L12 and L22 at the end of the first period is G1 = G1S +? X1 +? X2 -? R1 -? R2 ... (Equation 4).

Further, L12 =? X2 cos? 1 +? Y2 sin? (Equation 5).

In addition, L22 = -ΔX2 cos θ1 - ΔY2 sin θ1 - ΔR2 - G1 = -ΔX2 cos θ1 - ΔY2 sin θ1 - ΔR2 - (G1S + ΔX1 + ΔX2 - ΔR1 - ΔR2) (Equation 6).

The values of L11, L21, L12 and L22 measured by the first sensor and the second sensor are set such that the reference position is set to 0 and the inner side (roll center side) with respect to the second roll diameter direction is set to " (Positive) ", and the outer side with respect to the second roll diameter direction than the reference position is " negative value ".

Here, the first gap target value G1T (the target value of the gap dimension of the first gap) is equal to the gap dimension G1 of the first gap when measuring L11 and L21 in the first initial detection process, G1S =? 1 +? X1 +? X2 = L11 - L21 + 2 (? X2cos? 1 +? Y2sin? 1) By (Equation 1), (Equation 2) and (Equation 3) (Equation 7).

The gap dimension G1N of the first gap when the radius of the first roll is increased by? R1 by thermal expansion and the radius of the second roll is increased by? R2 by thermal expansion is equal to L12 G1S + DELTA X1 + DELTA X2 - DELTA R1 - DELTA R2 = DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DEL L12 - L22 + 2 (? X2 cos? 1 +? Y2 sin? (Equation 8).

G1 = G1N - G1T = (L12 - L22) - (L11 - L21), which is the variation amount of the first gap generated within each sensing period by the thermal expansion, can do. Therefore, in the above-described manufacturing method, in the first roll moving step, the first roll is moved so as to cancel out this variation amount? G1 = (L12 - L22) - (L11 - L21) 1 can be adjusted (reversed) to the gap target value.

A method of manufacturing a sheet with a paste layer according to any one of the above-described aspects, wherein the first sensor and the second sensor are disposed on a first side opposite to the first side A first side first sensor and a first side second sensor, and a second side first sensor and a second side second sensor arranged to face each other via a second end of the second roll, A first side first roll moving mechanism for moving the first end of the first roll in the first direction and a second side first roll moving mechanism for moving the second end of the first roll in the first direction, Wherein the detection step detects a variation amount of the gap dimension of the first end portion of the first gap by using the first side first sensor and the first side second sensor, The amount of variation of the gap dimension at the second end portion of the gap, And the first roll moving step is performed by using the first side first roll moving mechanism to detect the gap dimension of the first end of the first gap detected The first end of the first roll is moved so as to offset the fluctuation amount and the fluctuation amount of the gap dimension at the second end of the first gap detected by using the second side first roll moving mechanism is offset A method of manufacturing a sheet having a paste layer for moving the second end of the first roll may be used.

In the method for producing a sheet having the paste layer, a pair of first sensors, a second sensor, and a first roll moving mechanism are formed at each of the first end and the second end of the second roll, The roll moving process is performed for the first end and the second end of the second roll, respectively. Therefore, the fluctuation of the thickness of the second roll upper film caused by the variation of the first gap can be eliminated over the entire axial direction of the second roll for every detection period. Thus, according to this manufacturing method, the influence of the thermal expansion of the first roll and the second roll on the thickness and density of the paste layer formed on the base sheet is suppressed, It is possible to manufacture a sheet with a paste layer on which variation of the paste layer is suppressed.

Wherein the surface of the layer of the paste layer transferred onto the base sheet wound on the third roll is a surface of the layer on which the paste layer is adhered, The third roll surface of the third roll in a third angular position that is greater than 0 degrees and less than 90 degrees at a third angular advance in the third roll rotation direction, A third sensor which is disposed opposite to the third sensor with the third roll interposed therebetween and which is wound around the third roll surface or the third roll of the third roll, A fourth radial position of the third roll surface or the outer diameter surface at a fourth angular position of the outer surface which is rotated 180 degrees from the third angular position in the third roll rotation direction, And a third roll moving mechanism configured to move the third roll in a second direction connecting the second roll and the third roll, and a third roll moving mechanism configured to move the third roll in the second direction connecting the second roll and the third roll, The thermal expansion occurring in the second roll and the third roll from the radial position and the fourth radial position detected by the fourth sensor causes the gap size of the second gap generated during the detection period Detecting the variation amount every the detection period and moving the third roll in the second direction so as to cancel out the variation amount of the second gap detected using the third roll movement mechanism, After completion of the movement of the first roll by the first roll moving mechanism and after the movement of the third roll by the third roll moving mechanism is completed, The roll is 1/4 turn A method of manufacturing a sheet having a paste layer for starting a new detection period after a lapse of two rolls of a 1/4 rotation time and after a lapse of a third roll rotation time of rotating the third roll by the third angle .

In the above-described method for producing a sheet with a paste layer, a coating apparatus in which the first roll and the third roll are arranged around the second roll as described above is used. Therefore, even if the third roll is moved in the second direction in order to adjust the gap dimension of the second gap, this coating apparatus does not affect the gap dimension of the first gap. Therefore, in order to compensate for the fluctuation of the gap dimension of the second gap due to the thermal expansion of the second roll and the third roll and to properly maintain the size of the second gap without considering the influence on the first gap, The roll can be moved. Thus, by using the third sensor and the fourth sensor arranged as described above, the variation amount of the second gap due to the thermal expansion of the second roll and the third roll is detected every detection period, and the third roll movement mechanism , The third roll is moved in the second direction so as to cancel the fluctuation amount of the detected second gap. Thus, fluctuations in the thickness of the paste layer transferred onto the substrate sheet caused by the variation of the second gap can be eliminated every detection period, and variation in the second gap can be prevented from accumulating. Thus, according to this manufacturing method, the influence of the thermal expansion of the second roll and the third roll on the thickness of the paste layer formed on the base sheet is also suppressed, so that the fluctuation of the paste layer is further suppressed A sheet with a paste layer can be produced.

Further, the detection period may be set such that the movement of the first and third rolls by the first and third roll movement mechanisms is completed after the last detection period ends, and thereafter, After the second roll 1/4 turn time has elapsed and the third roll turn time has elapsed. As a result, the first gap and the second gap become new sizes by the movement of the first and third rolls, and the second roll top film formed through the first gap having the new size touches the second gap, , And after the timing at which the paste layer from the second gap can be detected by the third sensor, the next detection period starts. Therefore, from the beginning of the detection period, the outputs of the first sensor and the third sensor can be used.

The radial position of the outer surface of the third roll and the outer surface of the base sheet that is wound on the third roll and the surface of the layer of the paste layer means the position in the radial direction of the third roll with respect to the third roll center axis It says. The third sensor and the fourth sensor are displacement sensors for detecting the radial position of the layer surface of the paste layer or the third roll surface or the outer surface of the base sheet that is wound on the third roll. For example, Optical, laser or the like which can detect the radial position of the layer surface or the third roll surface or the outer surface of the diameter of the base sheet in a noncontact manner can be used. In these sensors, for example, while the base sheet is wound around the third roll, it is preferable that before the paste is supplied to the first gap (the paste is not coated on the second roll surface and the paste layer is not formed The outer surface of the outer diameter of the base sheet or the radial position of the third roll surface in a state in which thermal expansion has not occurred in each roll (before the production of the sheet having the paste layer is started) The radial position of the surface or the third roll surface or the outer surface of the base sheet may be detected.

The third angular position at which the third sensor detects the third radial position of the layer surface of the paste layer is a position at which the third gap is advanced from the second gap on the third roll surface by the third angle? , and θ3 = 0 to 90 °. Preferably, the third angle? 3 may be selected in the range of? 3 = 25 to 65 degrees, and further, in the range of? 3 = 25 to 50 degrees. This is because the third sensor is easy to arrange without interfering with the second roll and the third roll. As described above, the fourth sensor is disposed at a fourth angular position, which is 180 degrees from the third angular position with respect to the third roll rotational direction, of the third roll surface or the outer diameter surface of the base sheet, And detects the fourth radial position of the third roll surface or the outer diameter surface of the base sheet at the fourth angular position which is exactly opposite to the angular position with the third roll central axis interposed therebetween.

Therefore, from the third radial position of the layer surface of the paste layer detected by the output of the third sensor, for example, the thickness of the paste layer formed on the base sheet can be detected. In addition, from the change in the output of the third sensor and the fourth sensor generated within the detection period, it is possible to detect the amount of variation in the thickness of the paste layer generated in the detection period and thus the variation amount of the gap size of the second gap.

More specifically, an example will be described.

A variation amount? R2 of the radius (R2) of the second roll generated in any detection period,

The variation amount of the radius (R3) of the third roll generated in the detection period:? R3,

The variation amount of the second gap KG2 generated in the detection period:? G2,

The variation amount of the third radial position (PR6s) of the layer surface of the paste layer detected by the third sensor generated in the detection period: DELTA PR6s,

And the variation amount DELTA PR13s or DELTA PR2s of the fourth radial position (PR13s or PR2s) of the outer surface of the third roll surface or the outer surface of the base sheet detected by the fourth sensor generated during the detection period.

It can be seen that the thickness of the base sheet is constant in the longitudinal direction and the total thickness of the base sheet and the paste layer formed on the outer surface of the base is the same as the gap dimension of the second gap at the time of forming the paste layer . From this, the variation amount of the total thickness of the base sheet and the paste layer generated during any detection period (from the detection period to the boil period) is equal to the variation amount of the gap size of the second gap in the detection period .

When the radius R3 of the third roll is expanded by the variation amount? R3 by the thermal expansion during the detection period, the fourth radial position PR13s of the third roll surface detected by the fourth sensor, The fourth radial position PR2s of the radially outer surface of the base sheet moves out of the diameter. More specifically, the fluctuation amount? PR13s =? R3 (or? PR2s =? R3). Therefore, the variation (? R3) of the radius (R3) due to the thermal expansion of the third roll can be detected by the fourth sensor. On the other hand, in the third sensor, the third radial position (PR6s) of the layer surface of the paste layer is detected. The third radial position PR6s of the layer surface of the paste layer is a position obtained by adding the gap size G2 of the second gap to the radius R3 of the third roll. This corresponds to the radial position of the second roll surface of the second roll in the second gap. Therefore, when the radius R2 of the second roll is increased by the amount of change? R2 by the thermal expansion, the third radial position PR6s of the layer surface of the paste layer detected by the third sensor is reduced Movement). That is, the variation amount? PR6s of the third radial position PR6s detected by the third sensor is equal to half the variation amount? R2 of the radius R2 due to the thermal expansion of the second roll generated in the detection period ( ? PR6s = -ΔR2). The gap dimension G2 of the second gap is equal to the gap dimension G2 of the second roll and the third roll in the detection period by ignoring the movement of the second roll central axis and the third roll central axis in the detection period Lt; / RTI > That is, the variation amount? G2 of the gap dimension G2 corresponds to half the sum of the variation amounts? R2 and? R3 of the radii R2 and R3 generated in the second and third rolls (? G2 = - (? R2 + )). Therefore, the variation amount? G2 of the gap dimension G2 can be detected from the variation amount? PR6s detected by the third sensor and the variation amount? PR13s detected by the fourth sensor.

As described above, the variation amount? PR6s of the third radial position (PR6s) detected by the third sensor is the change amount? R2 of the radius (R2) due to the thermal expansion of the second roll generated in the detection period, (? RP6s = -ΔR2). On the other hand, as described above, the variation amount? PR12s of the second radial position PR12s of the second roll surface detected by the second sensor is the same as the variation amount? R2 of the radius R2 due to the thermal expansion of the second roll Do. From this, the variation amount? R2 of the radius R2 obtained from the outputs of the second sensor and the third sensor may be compared or averaged to obtain the variation amount? R2 of the radius R2.

The method of manufacturing a sheet with a paste layer according to any one of the preceding claims, wherein the detection step is a step of detecting the fluctuation amount of the second gap generated during the detection period by the thermal expansion of the second roll and the third roll, Of the layer surface of the paste layer detected by the third sensor in the third radial direction detected by the fourth sensor and the fourth radial direction of the third roll surface or the outer diameter surface detected by the fourth sensor A method of manufacturing a sheet with a paste layer to be obtained from the difference in positional variation may be employed.

In the method for producing a sheet having the paste layer, the amount of change (? G2) of the gap dimension (G2) of the second gap generated within the detection period in the detection step is set to a value From the difference between the amount of variation DELTA PR6s in the radial direction position PR6s and the amount of variation DELTA PR13s and DELTA PR2s in the fourth radial direction positions PR13s and PR2s of the outer surface of the third roll surface or the outer surface of the base sheet, The variation amount? G2 of the gap dimension G2 of the gap 2 can be easily obtained. That is, since the variation amount? G2 of the gap dimension G2 is calculated from the difference between the variation amount? PR6s and the variation amount? PR13s or? PR2s because? G2 = - (? R2 +? R3) =? PR6s -? PR13s It can be easily obtained.

It is preferable that, in the above-described method for producing a sheet having a paste layer, the third sensor is arranged so that, at the third angular position measured by the third sensor before the supply of the paste to the first gap is started Is a sensor for measuring an initial third radial position of the layer surface of the paste layer with a third radial position before the third roll surface of the paste layer as a reference position, The fourth radial position before the start of the third roll surface at the fourth angular position measured by the fourth sensor before the supply of the paste to the gap is started is set as the reference position, Wherein the sensor is a sensor for measuring the radially outer surface of the third roll surface or the initial fourth radial position of the third roll surface and at the beginning of the first detection period in the repeated detection period, Wherein the third roll is calculated from the time when the second roll top film first reaches the gap between the third roll and the third roll, and before the third roll is rotated by the third angle or more, , The initial third radial position of the layer surface of the paste layer with the pre-start third radial position as the reference position, and the fourth sensor with the fourth radial position before the start Measuring an initial fourth radial position of the outer surface of the substrate or the third roll surface with the position as a reference position and measuring the initial third radial position and the initial fourth radial position The third sensor at the end of the layer surface of the paste layer with the third radial position as the reference position at the end of each sensing period, And measuring a fourth radial position at the end of the outer diameter surface of the base sheet or at the end of the third roll surface with the fourth radial position as the reference position by the fourth sensor (L42 - L32) - (L41 - L31), the value of? G2, which is the variation amount of the second gap generated within each sensing period by the thermal expansion, do.

When the second roll top film reaches the second gap and the processing of forming the paste layer by compressing the coating film between the second roll and the third roll is started, the processing reaction force acts on the second roll and the third roll . Immediately after the start of machining, a large machining reaction force is suddenly applied to the second roll and the third roll, so that the second gap between the second roll and the third roll is enlarged by the machining reaction force, (The rotational axis of the second roll is displaced in the direction away from the third roll, and the rotational axis of the third roll is displaced in the direction away from the second roll). Particularly, when a coating material composed of a wet assembly having a high solid content (a small amount of solvent) is used as a paste, the processing reaction force becomes large, and the positional shift of the second roll and the third roll is apt to occur. As a result, the gap dimension of the second gap between the second roll and the third roll varies.

Further, the second roll and the third roll are thermally expanded due to the frictional heat generated in the vicinity of the second gap after the start of the process of forming the paste layer while compressing the coating film between the second roll and the third roll. Particularly, when a coating material comprising a wet assembly having a high solid content (a small amount of solvent) is used as the paste, the amount of frictional heat generated becomes large, and thermal expansion of the second roll and the third roll is likely to occur. This thermal expansion also causes the gap dimension of the second gap between the second roll and the third roll to fluctuate.

Incidentally, the positional deviation of the second roll and the third roll due to the processing reaction force occurs mostly immediately after the start of machining (for example, from the start of machining to the first rotation of the third roll) (For example, when the number of revolutions of the third roll exceeds 30 rotations calculated from the start of machining) at the time of occurrence of thermal expansion of the second roll and the third roll (for example, Is a positional deviation of a certain degree). Therefore, after the gap dimension of the second gap changes due to the positional deviation of the second roll and the third roll due to the processing reaction force, the gap dimension of the second gap is increased along with the thermal expansion of the second roll and the third roll Can be thought of as fluctuating.

Therefore, in the above-described manufacturing method, the second gap (before thermal expansion of the second roll and the third roll) after the second gap changes due to the positional deviation of the second roll and the third roll due to the processing reaction force, (The second gap target value), and then, during the detection period, the gap dimension of the second gap is changed from the second gap target value to the second gap and the second gap target value The fluctuation amount that was varied in accordance with the thermal expansion of the third roll was calculated as the variation amount? G2. Then, in the third roll moving step, the gap size of the second gap is adjusted (turned back) to the second gap target value by moving the third roll to offset this variation amount? G2.

That is, in the manufacturing method described above, the second gap (before thermal expansion of the second roll and the third roll) after the second gap changes due to the positional deviation of the second roll and the third roll due to the processing reaction force, (The second gap target value), and feedback control is performed so that the gap dimension of the second gap becomes the second gap target value during the manufacturing period. By doing so, the thickness of the sheet having the paste layer formed by passing between the second roll and the third roll can be set to a second gap target value or a dimension close to the second gap target throughout the manufacturing period. Therefore, the thickness of the paste layer may be a dimension obtained by subtracting the thickness of the base sheet from the second gap target value, or a dimension close to the dimension, over the entire manufacturing period.

More specifically, in the above-described manufacturing method, after the first roll reaches the second gap, the third roll is rotated at the third angle? 3 or more, The initial third radial position and the initial fourth radial position are measured by the third sensor and the fourth sensor before the rotation of a few degrees.

More specifically, as the radial position of the layer surface of the paste layer by the third sensor, the " position of the paste at the third angular position measured by the third sensor before the supply of the paste to the first gap is started " (I.e., the third radial position before initiation, which is the reference position, that is, the radial position of the roll surface " 3 " The third roll diameter distance of the layer surface from the position).

Further, by the fourth sensor, the radial position of the outer surface of the base sheet or the radial position of the third roll surface is defined as " at the fourth angular position measured by the fourth sensor before the supply of the paste to the first gap is started Of the third roll surface, i.e., the fourth radial position of the third roll surface, i.e., the fourth radial position of the third roll surface before starting " The third radial distance of the third radial surface or the radially outer surface from the fourth radial position before starting, which is the reference position).

Further, when the third roll is rotated by the third angle? 3 or more, the leading end portion of the paste layer (leading end portion in the circumferential direction of the third roll) , &Quot; the third sensor reaches the third angular position at which the third radial position of the layer surface of the paste layer is detected ". It is also possible that no thermal expansion occurs in the second roll and the third roll until the third roll is rotated a predetermined number of times, or thermal expansion does not occur in the second roll and the third roll, Even if it occurs, the amount of expansion is very small and negligible.

Therefore, the L31 measured by the third sensor is set so that after the second gap changes due to the positional deviation of the second roll and the third roll due to the processing reaction force, and before the second roll and the third roll thermally expand (In other words, the position of the layer surface from the third radial position before initiation, which is the reference position), of the layer surface of the paste layer (when the thermal expansion occurs, the expansion amount is very small and negligible) Third roll diameter distance).

The L41 measured by the fourth sensor in the above-described second initial detection step is a value obtained after the second gap changes due to the positional deviation of the second roll and the third roll due to the processing reaction force, The outer surface of the outer diameter of the base sheet or the radial position of the third roll surface (that is, when the thermal expansion of the roll and the third roll is negligibly small even when thermal expansion occurs) The radially outer surface from the fourth radial position before start, which is the reference position, or the third roll radial distance of the third roll surface).

In addition, in the above-described manufacturing method, after the initial third radial position and the initial fourth radial position are measured, at the end of each detection period, the third sensor and the fourth sensor detect the third The radial position and the fourth radial position at the end are measured.

More specifically, at the end of the layer surface of the paste layer in which the third radial position before the start is set as the reference position (zero reference) as the radial position of the layer surface of the paste layer by the third sensor, (In other words, the third roll diameter-direction distance of the layer surface from the third radial position before the start, which is the reference position) is measured.

The outer surface of the base sheet or the radial position of the third roll surface may be a radially outer surface of the base sheet in which the fourth radial position is the reference position The third radial position of the third roll surface (in other words, the radially outer surface of the third roll surface from the fourth radial position before initiation which is the reference position, or the third roll radial distance of the third roll surface) is measured.

Further, at the end of each detection period, it is considered that the second roll and the third roll are thermally expanded considerably. Therefore, L32 measured by the third sensor in the detecting process at the end of the second period is after the second gap has fluctuated with the positional deviation of the second roll and the third roll due to the processing reaction force, (That is, the third roll diameter direction distance of the layer surface from the third radial position before start, which is the reference position) after the thermal expansion of the roll and the third roll.

The L42 measured by the fourth sensor in the detecting process at the end of the second period is after the second gap has changed due to the positional deviation of the second roll and the third roll due to the processing reaction force, The outer surface of the outer diameter of the base sheet or the radial position of the third roll surface (in other words, the radially outer surface from the fourth radial position before start, which is the reference position, or the outer surface of the third roll surface after the third roll has thermally expanded) Third roll diameter distance).

Further, in the above-described manufacturing method,? G2, which is the variation amount of the second gap generated within each detection period by the thermal expansion, is calculated using the relational expression? G2 = (L42 - L32) - (L41? L31).

Here, a method for deriving the above relational expression will be described. Here, the case where the fourth sensor detects the fourth radial position of the outer surface of the diameter of the base sheet will be described. Also, when the fourth sensor detects the fourth radial position of the third roll surface, the above relational expression can be derived in the same manner.

First, the set value of the gap dimension of the second gap (the gap dimension of the second gap before starting manufacturing) is G2S. Further, the positional shift amount of the third roll which is moved (displaced) in the second direction by the processing reaction force is defined as? Y3. Further, the increase amount of the radius due to thermal expansion of the third roll is defined as? R3. The positional shift amount of the second roll that moves (displaces) in the first direction due to the processing reaction force generated between the first roll and the second roll is represented by DELTA X2. Further, the positional shift amount of the second roll that moves (displaces) in the second direction due to the processing reaction force generated between the second roll and the third roll is defined as DELTA Y2. Further, the increase amount of the radius due to thermal expansion of the second roll is defined as DELTA R2. The thickness of the base sheet is defined as TH.

G2 = G2S + [Delta] Y2 + [Delta] Y3-TH [0040] In this case, the gap G2 of the second gap when measuring L31 and L41 in the second initial detection step is G2 = (Expression 11).

Further, L31 =? Y3cos? 3 -TH-G2 =? Y3cos? 3 -TH- (G2S +? Y2 +? Y3-TH) (Expression 12). Further, L41 = - DELTA Y3 cos [theta] 3 - TH ... (13). The gap dimension G2 of the second gap when measuring L32 and L42 in the detection process at the end of the second period is G2 = G2S + DELTA Y2 + DELTA Y3 - TH - DELTA R2 - DELTA R3 (14).

The relationship L32 =? Y3cos? 3 - TH -? R3 - G2 =? Y3cos? 3 - TH -? R3- (G2S +? Y2 +? Y3 - TH -? R2 - (Equation 15). Further, L42 = -ΔY3 cos θ3 - TH - ΔR3 (Expression 16). The values of L31, L41, L32 and L42 measured by the second sensor and the third sensor are set such that the reference position is set to 0 and the inner side (roll center side) with respect to the third roll diameter direction is defined as " Quot; value ", and the outer side with respect to the third roll diameter direction than the reference position is " negative value ".

Here, the second gap target value G2T (the target value of the gap dimension of the second gap) is equal to the gap dimension G2 of the second gap when the L31 and L41 are measured in the second initial detection process, G2 = G2S +? Y2 +? Y3 - TH = L41 - L31 + 2? Y3 cos? 3 ... TH3 by means of (Expression 11), (Expression 12) (Equation 17).

The gap dimension G2N of the second gap when the radius of the second roll is increased by DELTA R2 by thermal expansion and the radius of the third roll is increased by DELTA R3 by thermal expansion is calculated by L32 G2 = G2S + DELTA Y2 + DELTA Y3 - TH - DELTA R2 - DELTA G2 - DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA DELTA ? R3 = L42 - L32 + 2? Y3 cos? (Equation 18).

G2 = G2N - G2T = (L42 - L32) - (L41 - L31), which is a variation amount of the second gap generated within each sensing period due to thermal expansion, can do. Therefore, in the above-described manufacturing method, in the third roll moving step, the third roll is moved so as to cancel out this variation amount? G2 = (L42 - L32) - (L41 - L31) 2 can be adjusted (reversed) to the gap target.

In the method for producing a sheet having a paste layer described in any one of the above, a plurality of the third sensors and the fourth sensor are provided on the first side of the third roll, which is disposed to face each other via the first end of the third roll, Side sensor and a second-side fourth sensor disposed opposite to each other via a second end of the third roll, and the third roll-moving mechanism includes a third- A first side third roll moving mechanism configured to move the first end of the third roll in the second direction, and a third side roll moving mechanism configured to move the second end of the third roll in the second direction Side third roll moving mechanism and detects a variation amount of the gap dimension of the first end portion of the second gap by using the first side third sensor and the first side fourth sensor, 2, the amount of variation of the gap dimension at the second end portion of the gap Side third sensor and the second side-fourth sensor, and the first side-third roll-moving mechanism detects the variation in the gap dimension of the first end portion of the detected second gap by using the third side sensor and the second side- And the third side roll moving mechanism moves the first end of the third roll so that the amount of variation of the gap dimension of the second end of the detected second gap is canceled by the second side third roll moving mechanism, The second end of the roll may be moved.

In the production method of the sheet having the paste layer, a pair of the third sensor, the fourth sensor and the third roll moving mechanism are formed at each of the first end and the second end of the third roll, And the roll moving process is performed on the first end and the second end of the third roll, respectively. Therefore, the fluctuation of the thickness of the paste layer on the base sheet caused by the variation of the second gap can be eliminated over the entire axial direction of the second roll every detection period. Thus, according to this manufacturing method, the influence of the thermal expansion of the second roll and the third roll on the thickness of the paste layer formed on the base sheet can be suppressed, It is possible to manufacture a sheet with a paste layer on which fluctuation of the thickness of the paste layer is suppressed.

Another solution is a coating apparatus for forming a strip-shaped paste layer made of a paste on a strip-shaped base sheet, the apparatus comprising: a first roll; and a second roll arranged parallel to the first roll with a first gap therebetween, A second roll which is rotated in a second roll rotation direction opposite to the first roll and a second roll which is arranged in parallel with the second roll through a second gap and rotates in a direction opposite to the second roll, Wherein the first roll, the second roll, and the third roll are disposed so that the second roll center axis of the second roll and the third roll of the first roll A second imaginary plane connecting a first roll center axis and a second imaginary plane connecting the second roll center axis of the second roll and the third roll center axis of the third roll is perpendicular to the second roll center axis, The first gap and the second gap, And the second gap is formed on the second roll surface of the second roll in a direction of 1/4 rotation in the second roll rotation direction, In a first angular position of the coating film surface of the second roll top film at a first angle progressed from the first gap toward the second roll surface in the second roll rotation direction by more than 0 DEG and less than 90 DEG, A first sensor for detecting a first radial position of the coating film surface of the second roll top film; and a second sensor for detecting the position of the second roll top surface of the second roll, A second sensor for detecting a second radial position of the second roll surface at a second angular position that advances 180 degrees in the second roll rotation direction from the first angular position, The first roll- A first roll moving mechanism for moving the first roll in one direction and a second roll moving mechanism for feeding the paste to the first gap and passing the second roll top coat applied on the second roll surface through the second gap, The first roll and the second roll are transferred to the base sheet conveyed by the third roll, and the thermal expansion occurring in the first roll and the second roll along with the continuous formation of the paste layer on the base sheet, A first radial direction position detected by the first sensor and a second radial direction position detected by the second sensor are used to calculate a variation amount of the gap dimension of the first gap generated during the sensing period A first gap variation detection unit configured to detect a gap variation between the first gap variation detection unit and the first gap variation detection unit to cancel the variation amount of the first gap detected by the first gap variation detection unit toward the first roll movement mechanism, A first roll movement instruction unit configured to issue an instruction to move the first roll in one direction after the movement of the first roll by the first roll movement mechanism And an adjustment unit configured to start a new detection period after a second roll rotation time for which the second roll rotates by the first angle minute has elapsed thereafter.

In the above-described coating apparatus, the first roll and the third roll are disposed at right angles to each other with the second roll as the center. Therefore, even if the first roll is moved in the first direction in order to adjust the gap dimension of the first gap, the gap dimension of the second gap located in the second direction orthogonal to the first gap is hardly affected. Therefore, the first roll can be moved without considering the influence on the second gap. It is also understood that the thickness of the second roll top film is the same as the size of the first gap at the time of forming the second roll top film. In this coating apparatus, the coating film surface of the second roll top film detected by the first and second sensors and the radial position of the second roll surface are used by the first gap variation detecting section to detect the position of the first gap The variation amount of the gap dimension is detected every detection period. Further, in the first roll movement instructing section, an instruction to move the first roll in the first direction is given to the first roll movement mechanism so as to cancel the variation in the detected first gap. Thus, the fluctuation of the thickness of the second rolled film caused by the variation of the first gap can be removed every detection period, and accumulation of fluctuation of the first gap can be prevented. In this way, according to this coating apparatus, it is possible to suppress the fluctuation of the thickness of the second roll top film due to the thermal expansion of the first roll and the second roll, and further to suppress the fluctuation of the thickness and density in the longitudinal direction of the base sheet A paste layer can be applied on the base sheet.

Further, in the adjustment section, after the completion of the previous detection period, the movement of the first roll by the first roll movement mechanism is completed, and thereafter, the second roll is rotated by the first angle? After the rotation time has elapsed, a new detection period is started. Thereby, the first gap becomes a new size by the movement of the first roll, and after the timing at which the second roll top film by the new first gap becomes able to be detected by the first sensor, the next detection period The output of the first sensor can be used from the beginning of the detection period.

The first gap variation detection unit may change the variation amount of the first gap generated during the detection period by the thermal expansion of the first roll and the second roll to the coating amount A variation in the first radial position of the coating film surface of the second roll top film detected by the first sensor and a variation in the second radial position of the second roll surface of the second roll detected by the second sensor From the difference between the coating amount and the coating amount.

In this coating apparatus, the variation amount of the gap dimension of the first gap generated within the detection period in the first gap variation detection section is determined by the amount of variation in the first radial direction position of the coating film surface of the second roll coating film, Is obtained from the difference in the amount of variation in the second radial position of the roll surface of the two rolls, the amount of variation in the gap dimension of the first gap can be easily obtained.

It is preferable that, as the above-described application device, the first sensor is a sensor for measuring the position of the second roll surface at the first angular position, which is measured by the first sensor before the supply of the paste to the first gap is started And the second sensor is a sensor for detecting the first radial position of the coating film surface with the first radial position before start, and the second sensor is a sensor for detecting the position in the first radial direction, Measuring the second radial position of the second roll surface with the second radial position before the start of the second roll surface at the second angular position measured by the second sensor as the reference position And the first gap variation detection unit calculates the period from when the supply of the paste is started to the first gap at the start of the first detection period of the detection period which is repeatedly formed, Before the second roll is rotated by the first angle (? 1) or more and before the second roll is rotated a predetermined number of times, the first sensor moves the first radial position before the start to the reference position Wherein the first initial radial position of the coating film surface is measured and the initial second radial position of the second roll surface with the second pre-start radial position as the reference position A value of the initial initial radial position of the coating film surface measured and a value of the initial second radial position of the second roll surface are obtained, and thereafter, at the end of each of the detection periods , The first sensor measures the first radial position at the end of the coating film surface with the first radial position as the reference position before the start, and the second sensor measures the first radial position at the end of the coating film surface, Direction position is above the reference Measuring a second radial position at the end of the second roll surface to determine a value of a first radial position at the end of the measured coating film surface and a second radial position of the second roll surface at the end of the second roll surface, And a value of the variation amount of the first gap generated during each of the detection periods by the thermal expansion is set to a value of L11 at the initial initial radial position and a value of the initial secondary radial position (L12 - L22) - (L11 - L21), where L21 is a value at the end of the first radial direction, L12 is a value of the first radial position at the end, and L22 is a value of the second radial position at the end of the completion. Device.

In the above-described coating device, the first gap variation detecting unit may measure the value of the initial first radial position (L11) of the coating film surface measured by the first sensor, The value of the initial second radial position L21 of the roll surface is obtained. The first gap variation detecting unit may be configured to detect the value of the first radial position L12 at the end of the coated film surface measured by the first sensor and the value of the second radial position L12 measured at the end of the second roll surface measured by the second sensor And obtains the value of the radial direction position L22. Further, the first gap variation detection unit calculates the value of? G1, which is the variation amount of the first gap generated within each detection period by thermal expansion, using the relational expression? G1 = (L12 - L22) - (L11 - L21). The method of deriving the relational expression is as described in the above-described manufacturing method.

Therefore, in the above-described coating device, the first roll is moved by the first roll moving mechanism so as to cancel the variation amount? G1 = (L12 - L22) - (L11 - L21) The gap dimension of one gap can be adjusted (reversed) to the first gap target value. Thus, the thickness of the coating film formed by passing between the first roll and the second roll can be set to the first gap target value or a dimension close to the first gap target throughout the manufacturing period.

The first sensor and the second sensor may include a first side first sensor and a first side second sensor disposed opposite to each other via a first end of the second roll, And a second side first sensor and a second side second sensor disposed opposite to each other via a second end of the second roll, wherein the first roll moving mechanism includes a first roll Side first roll moving mechanism for moving the second end of the first roll in the first direction and a second side first roll moving mechanism for moving the second end of the first roll in the first direction, The detecting unit detects the amount of variation of the gap dimension at the first end of the first gap by using the first side first sensor and the first side second sensor and measures the gap dimension of the second end of the first gap Side first sensor and the second side second sensor And the first roll movement instruction unit is configured to move the first roll toward the first roll first movement mechanism so as to cancel the variation of the gap dimension of the first gap among the first gap detected, Side roll moving mechanism to perform a movement instruction of the first end and to cancel the variation amount of the gap dimension of the second gap of the first gap detected toward the second- Or may be an application device for instructing movement of the second end portion.

In this coating apparatus, a pair of first sensors, a second sensor, and a first roll moving mechanism are formed on the first end and the second end of the second roll, respectively. In the first gap variation detecting section, And the first roll movement instruction unit instructs movement of the first end and the second end of the first roll toward the pair of first roll movement mechanisms . Therefore, the fluctuation of the thickness of the second roll upper film caused by the variation of the first gap can be eliminated over the entire axial direction of the second roll for every detection period. In this way, the coating apparatus suppresses the influence of the thermal expansion of the first roll and the second roll on the thickness of the second roll top film, so that the thickness and the density It is possible to apply the paste layer suppressing the fluctuation to the base sheet.

Wherein the surface of the layer of the paste layer transferred on the base sheet wound around the third roll is the surface of the third roll of the third roll from the second gap to the third surface of the third roll, A third sensor for detecting a third radial position of the layer surface of the paste layer at a third angular position that is greater than 0 DEG and less than 90 DEG in the roll rotational direction and advanced at a third angle, Of the outer surface of the base sheet that is wrapped around the third roll surface or the third roll of the third roll, and the third outer surface of the base sheet, A fourth sensor for detecting a fourth radial position of the third roll surface or the outer surface of the diameter at a fourth angular position rotated 180 degrees in the roll rotational direction, Second A third roll moving mechanism for moving the third roll in the direction of the first roll and the second roll in the direction of the first roll, and a thermal expansion occurring in the second roll and the third roll, A second gap fluctuation detecting unit for detecting the second gap variation detecting unit for each sensing period using the third radial position detected by the third sensor and the fourth radial position detected by the fourth sensor, And a third roll movement instruction unit for instructing the mechanism to move the third roll in the second direction so as to cancel the variation of the second gap detected by the second gap variation detection unit, The adjustment unit may be configured such that the movement of the first roll by the first roll moving mechanism is completed after the previous sensing period ends and the movement of the third roll by the third roll moving mechanism After the lapse of the third roll? 3 rotation time in which the second roll 1/4 rotation time elapses and the third roll rotates by the third angle? 3, the new detection period Or the like.

In the above-described coating device, as described above, the first roll and the third roll are arranged around the second roll. Therefore, even if the third roll is moved in the second direction in order to adjust the gap dimension of the second gap, the gap dimension of the first gap located in the first direction orthogonal to the third gap is hardly affected. Therefore, the third roll can be moved without considering the influence on the first gap. In this coating apparatus, the second gap variation detecting section generates during the detection period, using the layer surface of the paste layer detected by the third and fourth sensors and the radial position of the third roll surface or the outer surface of the diameter of the base sheet The amount of variation in the gap dimension of the second gap is detected every detection period. Further, in the third roll movement instructing section, an instruction to move the third roll in the second direction is issued to the third roll movement mechanism so as to cancel the variation in the detected second gap. Thus, fluctuation of the thickness of the paste layer caused by variation of the second gap can be removed every detection period, and variation in the second gap can be prevented from accumulating. In this way, according to this coating device, not only the influence of the thermal expansion of the first roll and the second roll but also the influence of the thermal expansion of the third roll can be suppressed, so that the variation of the thickness is suppressed A paste layer can be applied on the substrate sheet.

Further, after the end of the previous sensing period, the adjustment unit completes the movement of the first and third rolls by the first and third roll movement mechanisms, respectively, and thereafter, A new detection period is started after the 1/4 rotation time of the roll has elapsed and the rotation time of the third roll 3 has elapsed. As a result, the first gap and the second gap become new sizes by the movement of the first and third rolls, and the second roll top film formed through the first gap having the new size touches the second gap, , And after the timing at which the paste layer from the second gap can be detected by the third sensor, the next detection period starts. Therefore, from the beginning of the detection period, the outputs of the first sensor and the third sensor can be used.

The second gap variation detecting unit may change the amount of variation of the second gap generated during the detection period by the thermal expansion of the second roll and the third roll, A variation in the third radial position of the layer surface of the paste layer detected by the third sensor and a variation in the third radial position of the third roll surface or the outer diameter surface detected by the fourth sensor Or from the difference in the amount of variation.

In this coating apparatus, the amount of variation in the gap dimension of the second gap generated within the detection period in the second gap variation detection section is determined by the amount of variation in the third radial position of the layer surface of the paste layer, From the difference in the amount of variation in the fourth radial position of the surface or the outer surface of the diameter of the base sheet, the amount of variation in the gap dimension of the second gap can be easily obtained.

It is preferable that, as the above-described application device, the third sensor is a sensor that measures the third gap between the third roll surface at the third angular position, measured by the third sensor before the supply of the paste to the first gap, Is a sensor for measuring the third radial position of the layer surface of the paste layer with the third radial position before start as the reference position and the fourth sensor is a sensor for measuring the supply of the paste to the first gap Wherein the fourth radial position of the third roll surface at the fourth angular position measured by the fourth sensor before starting is set as the reference position, And the second gap variation detection unit is a sensor for measuring the fourth radial position of the third roll surface, and the second gap variation detection unit is a sensor for detecting the fourth radial position of the third roll, Wherein the third roll is calculated from the time when the second roll top film first reaches the gap between the third roll and the third roll, and before the third roll is rotated by the third angle or more, The initial third radial position of the layer surface of the paste layer with the third radial position before the start is measured by the fourth sensor, Measuring an initial fourth radial position of the outer surface of the base sheet or the third roll surface with the direction position as a reference position and measuring the initial third radial position of the layer surface of the paste layer measured Of the base sheet and the value of the initial fourth radial position of the third roll surface, and then, at the end of each of the detection periods, The sensor measures the third radial position at the end of the layer surface of the paste layer with the third radial position as the reference position before the start, Measuring a fourth radial position of the outer surface of the substrate sheet or the third roll surface at the end of the third roll surface with the radial position as a reference position and measuring the third radial position of the layer surface of the paste layer measured at the end of the third radial direction Position of the base sheet and the value of the fourth radial position at the end of the third roll surface at the end of the base sheet, and calculating a value of the position of the second gap generated during each of the detection periods by the thermal expansion The value of the variation amount? G2 is set to L31, the value of the initial fourth radial position is L41, the value of the initial third radial position is L41, (L42 - L32) - (L41 - L31), where L32 is a value at the fourth radial position, and L42 is a value at the fourth radial position at the end of the process.

In the above-described coating device, the second gap variation detecting part measures the value of the initial third radial position (L31) of the layer surface of the paste layer measured by the third sensor, Or the initial fourth radial position L41 of the third roll surface. Further, the second gap variation detecting unit may determine the value of the third radial position (L32) at the end of the layer surface of the paste layer measured by the third sensor and the value of the third radial position And obtains the value of the fourth radial position L42 at the end of the third roll surface. Further, the second gap variation detecting unit calculates the value of? G2, which is the variation amount of the second gap generated within each sensing period by the thermal expansion, using the relational expression? G2 = (L42 - L32) - (L41? L31). The method of deriving the relational expression is as described in the above-described manufacturing method.

Therefore, in the above-described coating device, the third roll is moved by the third roll moving mechanism so as to cancel out this variation amount? G2 = (L42 - L32) - (L41 - L31) The gap dimension of the two gaps can be adjusted (reversed) to the second gap target value. Thus, the thickness of the coating formed by passing between the second roll and the third roll can be set to a second gap target value or a size close to the second gap target throughout the manufacturing period.

It is preferable that the third sensor and the fourth sensor include a first side third sensor and a first side fourth sensor disposed opposite to each other via a first end of the third roll, , A second side third sensor and a second side fourth sensor disposed opposite to each other via a second end of the third roll, and the third roll moving mechanism includes a third roll moving mechanism And a second side third roll moving mechanism for moving the second end of the third roll in the second direction, wherein the second side third roll moving mechanism moves the second end of the third roll in the second direction, The gap variation detecting unit detects the variation amount of the gap dimension at the first end of the second gap by using the first side third sensor and the first side fourth sensor, The amount of variation of the gap dimension is measured by the second side third sensor and the second side fourth sensor And the third roll movement instruction unit is configured to detect the movement of the first roll by using the sensor so as to cancel the variation of the gap dimension of the first gap among the second gaps detected, 3 roll is instructed to move the first end of the third roll toward the second side third roll moving mechanism so as to offset the amount of variation in the gap dimension of the second end of the detected second gap, And an instruction to move the second end of the roll is issued.

In this coating apparatus, a pair of the third sensor, the fourth sensor and the third roll moving mechanism are formed at each of the first end and the second end of the third roll, and the second gap variation detecting section And the third roll movement instruction unit instructs the movement of the first end and the second end of the third roll toward the pair of third roll movement mechanisms . Therefore, the fluctuation of the thickness of the paste layer caused by the variation of the second gap can be eliminated over the entire axial direction of the second roll every detection period. In this way, according to the application device, not only the influence of the thermal expansion of the first roll and the second roll but also the influence of the thermal expansion of the third roll on the thickness of the paste layer formed on the base sheet is suppressed, It is possible to coat the base sheet with a paste layer in which variations in the thickness are suppressed both in the width direction and the length direction of the sheet.

The features, advantages, and technical and industrial significance of the exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like elements.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing an outline of a coating apparatus and a drying apparatus for producing an electrode plate (a sheet having a dry paste layer) related to the embodiment; FIG.
Fig. 2 is a flowchart showing a step of manufacturing an electrode plate, relating to the embodiment. Fig.
3 is a flowchart showing the content of the application step.
Fig. 4 is an explanatory view showing a coating apparatus including three rolls and a state of manufacture of a non-dried electrode plate using the same, according to the embodiment. Fig.
Fig. 5 is an explanatory view showing the relationship between the second roll and the second roll top film and the first sensor and the second sensor with respect to the second roll axis direction. Fig.
Fig. 6 is an explanatory diagram showing a pair of first roll moving mechanisms for moving the first roll and the other end of the first roll in the first direction, respectively, according to the embodiment.
Fig. 7 is an explanatory view showing the relationship between the third roll, the current collecting foil and the undried electrode plate, the third sensor and the fourth sensor with respect to the third roll axis direction. Fig.
Fig. 8 is an explanatory diagram showing a third roll moving mechanism and a pair of third roll moving mechanisms for moving the one end and the other end of the third roll in the second direction, respectively, according to the embodiment.
Fig. 9 relates to the embodiment, and is an explanatory diagram showing the change of each roll surface, the second roll top film and the undryed electrode plate when three rolls of the coating apparatus shown in Fig. 5 respectively thermally expand.
Fig. 10 relates to the embodiment, and is an enlarged explanatory diagram showing a change in the first roll surface, a second roll surface and a second roll top film and a measurement position of the first sensor in an enlarged manner, in Fig.
Fig. 11 relates to the embodiment, and is an enlarged explanatory view showing, on an enlarged scale, changes in the second roll surface, the third roll surface and the undried electrode plate and the measurement position of the third sensor in Fig.
Fig. 12 is an explanatory view showing the relationship between the control unit of the application device, the first to fourth sensors, and the first and third roll movement mechanisms, relating to the embodiment. Fig.
13 is a graph showing the time variation of the gap dimension of the first gap, and the solid line represents a case where the fluctuation due to the thermal expansion of the first and second rolls is canceled for each sensing period, And the case of not doing so.
14 is a graph showing a time variation of the gap dimension of the second gap, and the solid line represents a case where the fluctuation due to the thermal expansion of the second and third rolls is canceled for each sensing period, And the case of not doing so.
Fig. 15 is an explanatory view showing a coating apparatus including three rolls, and a state of manufacture of a non-dried electrode plate using the same, according to a first modification. Fig.
Fig. 16 is an explanatory diagram of a coating apparatus according to a second modification and a method for manufacturing an un-dried electrode plate using the same.
17 is a part of a flowchart showing the content of a coating process related to the second modification.
18 is a part of a flowchart showing the content of the coating process related to the second modification.
19 is an explanatory diagram of a first roll moving mechanism and a first roll driving mechanism according to a second modification.
20 is an explanatory diagram of a third roll moving mechanism and a third roll driving mechanism related to the second modification.
Fig. 21 is a graph showing the time variation of the gap dimension of the first gap according to the second modification. Fig.
22 is a graph showing the time variation of the gap dimension of the second gap according to the second modification.

(Embodiments)

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows a manufacturing process of an electrode plate 1 using a coating device 10 and a drying device 30 according to the present embodiment. Figs. 4 to 14 show the details of the coating device 10 and the flow charts of the steps of manufacturing the electrode plate 1 using the rolls 11, 12, The top coat film 5 and the non-dried active material layer 6 are formed.

As shown in Fig. 1, in the present embodiment, a coating apparatus 10 is used to coat a surface 2s of a current collecting foil 2 made of a strip-shaped aluminum foil and fed from a current collecting foil roll 2RL Dried electrode plate 7 on which the non-dried active material layer 6 is coated. The electrode plate 1 is formed by heating the non-dried electrode plate 7 with a heater of the drying device 30 to dry the current collector foil 2 so that the active material layer 3 is formed in a strip shape And wound as an electrode plate roll 1RL. The active material layer 3 is made of known positive electrode active material particles, conductive material particles, and a binder.

A manufacturing method of the electrode plate 1 will be described in detail with reference to the flowchart of Fig. First, in step S1, a non-dried active material layer 6 is coated on one surface 2sa of the current collector foil 2 by using the application device 10 to form a non-dried electrode plate 7 do. Subsequently, in the drying step S2, the non-dried active material layer 6 applied by using the drying device 30 is dried to form the active material layer 3, and the electrode plate 1 formed at one end is wound on the electrode plate roll ( 1RL). Next, in the coating step S3, the electrode plate roll 1RL is fed as a current collecting foil roll 2RL again to the coating device 10 (the current collecting foil 2 on which the active material layer 3 is formed on the opposite face) And the non-dried active material layer 6 is applied on the other surface (back side) 2sb of the current collector foil 2 to prepare an uncut electrode plate 7. [ In the drying step S4, the non-dried active material layer 6 applied by using the drying device 30 is dried, and the electrode plate 1 is wound as an electrode plate roll 1RL. Thus, the electrode plate 1 having the active material layers 3 and 3 on both surfaces 2sa and 2sb of the current collector foil 2 is completed.

4, the coating apparatus 10 includes a first roll 11 having a radius R1 and a second roller 11 disposed parallel to the first roller 11 via a first gap KG1 And a third roll 13 of a radius R3 disposed parallel to the second roll 12 via a second gap KG2. Four pairs of displacement sensors, i.e., the first sensors 21 (21a and 21b) and the fourth sensors 24 (24a and 24b) are provided on the second roll 12 and the third roll 13, ) (See Figs. 4, 5, and 7). The first roll moving mechanism 25 (25a and 25b) and the third roll moving mechanism 26 (26a and 26b) for moving the first roll 11 and the third roll 13 are respectively provided with 1 Pair. The detection and processing of the outputs of the first to fourth sensors 21 to 24 and the control of the first and third roll moving mechanisms 25 and 26 are performed by the controller 27 (see Figs. 1 and 12) .

The first roll 11 and the third roll 13 are arranged at right angles in the first to third rolls 11, 12 and 13 with the second roll 12 as the center. Specifically, the first to third rolls 11, 12, and 13 are disposed so that the second roll center axis 12ax of the second roll 12 and the first roll center axis 11ax of the first roll 11 are in contact with each other, And a second imaginary plane PL21 connecting the second roll center axis 12ax of the second roll 12 and the third roll center axis 13ax of the third roll 13 PL23 are disposed orthogonally to each other in the second roll central axis 12ax. In addition, a portion of the second clearance KG1 on the second roll surface 12s of the second roll 12 is moved in the second roll rotation direction RL2 by 1/4 rotation, (KG2) are formed.

As shown in Fig. 4, the first to third rolls 11, 12 and 13 are arranged so that the first roll rotation direction RL1 of the first roll 11 and the third roll rotation direction of the third roll 13 The second roll rotation direction RL2 of the second roll 12 rotates in the reverse direction (counterclockwise in this figure) only. The peripheral speed of the first roll 11, the second roll 12 and the third roll 13 is increased in this order.

A paste holding portion 14 for holding the active material paste 4 and supplying it toward the first gap KG1 is provided above the first gap KG1 between the first roll 11 and the second roll 12, Is formed.

When the active material paste 4 is supplied to the paste holding portion 14, the second roll top film 5 is formed on the second roll surface 12s of the second roll 12 through the first gap KG1 . The current collecting foil 2 is wound around the third roll 13 and is conveyed through the second gap KG2 together with the rotation. The second roll top film 5 on the second roll surface 12s is transferred to the current collecting foil 2 on the third roll 13 side in the second gap KG2, Dried electrode plate 7 on which the non-dried active material layer 6 is formed on the surface 2s of the electrode plate 2 is manufactured. Thereafter, as described above, it is sent to the drying device 30, and the non-dried active material layer 6 is dried to become the active material layer 3, and the strip-shaped electrode plate 1 is formed. When the active material layer 3 is formed on both sides of the current collector foil 2, the electrode plate roll 1RL in which the electrode plate 1 on which the active material layer 3 is formed on one side is wound, Dried electrode plate 7 is formed by forming a non-dried active material layer 6 on the other surface 2s of the current collector foil 2 with the application device 10 as the current collector foil roll 2RL, And then dried with the drying device 30.

A first sensor 21 and a second sensor 22, which are displacement sensors, are disposed around the second roll 12 of the application device 10. [ The first sensor 21 and the second sensor 22 are laser displacement gauges (for example, LK-H022 manufactured by Keyence). Of these, the first sensor 21 is disposed on the surface 5s of the second roll top film 5 made of the active material paste 4 applied to the second roll surface 12s from the first gap KG1 A first angular position in which the second roll surface 12s is moved in the second roll rotation direction RL2 by a first angle? 1 (where 0 占 <? 1 <90 占 (? 1 = 45 占 in this embodiment) Is arranged so as to detect the first radial position (PR5s) of the coating film surface (5s) of the second roll top coat (5) in the first roll (AG1).

On the other hand, the second sensor 22 is disposed so as to face the first sensor 21 with the second roll 12 sandwiched therebetween. That is, in the second angular position AG2 of the second roll surface 12s of the second roll 12 that has moved 180 degrees from the first angular position AG1 to the second roll rotational direction RL2, And to detect the second radial position PR12s of the second roll surface 12s.

A third sensor 23 and a fourth sensor 24 are disposed around the third roll 13. The third sensor 23 and the fourth sensor 24 are also the same laser displacement gauge as the first and second sensors 21 and 22. Of these, the third sensor is disposed between the second gap KG2 and the third roll (among the layer surfaces 6s of the non-dried active material layer 6 transferred onto the current collecting foil 2 wrapped around the third roll 13) (0 DEG &lt; [theta] 3 &lt; 90 DEG, in this embodiment, &amp;thetas; 3 = 45 DEG) in the third roll rotation direction RL3 on the third roll surface 13s And is arranged to detect the third radial position PR6s of the layer surface 6s of the non-dried active material layer 6 at the third angular position AG3.

The fourth sensor 24 is disposed so as to face the third sensor 23 with the third roll 13 interposed therebetween. That is, in the fourth angular position AG4, which is 180 degrees from the third angular position AG3, among the outside diameter surface 2sa of the diameter facing the outside of the current collector foil 2 wound around the third roll 13 Of the outer peripheral surface 2sa of the current collecting foil 2 to detect the fourth radial direction position PR2s.

The first sensor 21 and the second sensor 22 do not supply the active material paste 4 to the paste holding portion 14 and also cause the first and second rolls 11 and 12 to have thermal expansion The first radial position PR5s of the coating film surface 5s of the second roll top film 5 or the second roll surface 5s of the second roll top film 5s are measured with reference to the second roll surface 12s, 12s in the second radial direction position PR12s. The third sensor 23 and the fourth sensor 24 are arranged in such a state that the active material paste 4 is not supplied to the paste holding portion 14 and the current collecting foil 2 is wound around the third roll 23, The outer peripheral surface 2sa of the current collecting foil 2 wound around the third roll 13 measured on the first to third rolls 11-13 in a state in which no thermal expansion described later is generated, The displacement of the third radial position PR6s of the layer surface 6s of the dry active material layer 6 or the fourth radial position PR2s of the outer diameter side 2sa of the current collecting foil 2 is detected.

In this way, the thickness TH5 of the second roll top film 5 can be detected from the output of the first sensor 21. The thickness TH6 of the non-dried active material layer 6 or the thickness TH7 of the undried electrode plate 7 can be detected from the output of the third sensor 23.

However, as described above, in the coating device 10, when the non-dried active material layer 6 is continuously applied to the current collector foil 2 having a long strip shape, the first clearance KG1, the vicinity of the second clearance KG2 The rolls 11 to 13 are heated by frictional heat generated in the rolls 11 to 13 and the radii R1 to R3 of the rolls 11 to 13 gradually increase due to thermal expansion. That is, as shown in Figs. 9 to 11, the rolls 11 to 13 indicated by the chain double-dashed line gradually increase due to the thermal expansion, as shown by the solid line. 9 and 10, as the radii R1 and R2 of the first roll 11 and the second roll 12 gradually increase due to the thermal expansion, the first clearance KG1 The gap size G1 gradually decreases. Therefore, the thickness TH5 of the second roll top film 5 formed on the second roll surface 12s is also gradually thinned. Then, the thickness TH6 of the non-dried active material layer 6 formed on the current collector foil 2 is also gradually thinned.

In addition, as the radii R2, R3 of the second roll 12 and the third roll 13 gradually increase due to thermal expansion, the gap dimension G2 of the second gap KG2 also decreases. The thickness TH6 of the non-dried active material layer 6 formed on the outer diameter side surface 2sa of the current collector foil 2 is gradually thinned.

However, it is preferable that the radii R1, R2, and R3 of the respective rolls are R1, R1, and R1, R2, R2, and ΔR2 during the detection period due to the thermal expansion occurring in any detection period (from the detection period to the end) , And R3 → R3 + ΔR3. It is also assumed that the gap dimension G1 of the first gap KG1 is reduced from G1 to G1 -? G1. 9 and 10, the variation amount? G1 of the gap dimension G1 is set to be larger than the variation amount? R1 of the radius R1 of the first roll 11 and the variation amount? (ΔG1 = - (ΔR1 + ΔR2)) of the sum of the variation (ΔR2) of the radius (R2)

Similarly, as can be easily understood from Figs. 9 and 11, along with the thermal expansion of the second and third rolls 12 and 13, the gap dimension G2 of the second gap KG2 becomes G2 - &gt; G2 - Gt; G2. &Lt; / RTI &gt; On the other hand, the variation amount? G2 of the gap dimension G2 is set to be larger than the variation amount? R2 of the radius R2 of the second roll 12 and the variation amount? R3 of the radius R3 of the third roll 13, Is equal to the half of the agreement (ΔG2 = - (ΔR2 + ΔR3)).

As can be easily understood from Fig. 9, the second radial position PR12s of the second roll surface 12s, which is detected by the second sensor 22, is the variation amount? PR12s that occurs in any detection period (ΔPR12s = ΔR2) of the radius (R2) of the second roll (12) generated during the detection period. 9 and 10, the first radial position PR5s of the coating film surface 5s of the second roll top film 5, which is detected by the first sensor 21, The variation amount? PR5s occurring in the same detection period is equal to half the number of variations? R1 in the radius R1 of the first roll 11 generated during the detection period (? PR5s = -? R1).

Therefore, the output of the first sensor 21 and the output of the second sensor 22 can be used to calculate the variation amount? G1 of the gap dimension G1 of the first gap KG1 generated during the detection period. Specifically, the variation amount DELTA PR5s obtained from the output of the first sensor 21 and the variation amount DELTA PR12s obtained from the output of the second sensor 22 become equal to each other because DELTA G1 = - (DELTA R1 + DELTA R2) = DELTA PR5s - It can be seen that the variation amount? G1 of the gap dimension G1 is obtained from the difference? PR5s -? PR12s.

9 and 11, the fourth radial position PR2s of the radially outer surface 2sa of the current collecting foil 2 to be detected by the fourth sensor 24 is set to a value The fluctuation amount DELTA PR2s occurring during the period is equal to the fluctuation amount DELTA R3 of the radius R3 of the third roll 13 generated during the detection period (DELTA PR2s = DELTA R3). On the other hand, the fluctuation amount DELTA PR6s, which is generated in the third detection period by the third radial position PR6s of the layer surface 6s of the non-dried active material layer 6 detected by the third sensor 23, -R2 of the variation amount? R2 of the radius R2 of the generated second roll 12 (? PR6s = -? R2).

Therefore, the output of the third sensor 23 and the output of the fourth sensor 24 can be used to calculate the variation? G2 of the gap dimension G2 of the second gap KG2 generated during the detection period. Specifically, the variation amount DELTA PR6s obtained from the output of the third sensor 23 and the variation amount DELTA PR2s obtained from the output of the fourth sensor 24 become equal to each other because DELTA G2 = - (DELTA R2 + DELTA R3) = DELTA PR6s - DELTA PR2s. It can be seen that the variation amount? G2 of the gap dimension G2 can be obtained from the difference? PR6s -? PR2s.

5, the first sensor 21 and the second sensor 22 are disposed in the second roll 12 in the coating apparatus 10 of the present embodiment in such a manner that the second roll center axis 12ax One end 12A of one side HX12A (left side in Fig. 5) of the second roll axial direction HX12 along the second roll axial direction HX12 and the other side HX12B of the second roll axial direction HX12 , And the other end 12B of the right side (left side). That is, the coating apparatus 10 includes a first sensor 21a on one side and a second sensor 22a on the one side disposed opposite to each other via one end 12A of the second roll 12, Side first sensor 21b and the other-side second sensor 22b disposed opposite to each other with the other end 12B of the second sensor 12 interposed therebetween. In order to detect the fluctuation of the gap dimension G1 of the first gap KG1 over the entire second axial direction of roll HX12.

Therefore, in this embodiment, the output of the one-side first sensor 21a and the output of the one-side second sensor 22a are used to determine the gap dimension (i.e., the gap dimension) of one end KG1A of the first gap KG1 G1A) (see Figs. 4 and 6). Specifically, since? G1A = - (? R1 +? R2) =? PR5sa -? PR12sa, the fluctuation amount? PR5sa detected by the first sensor 21a on one side and the fluctuation amount A variation amount? G1A of the gap dimension G1A at the one end KG1A of the first gap KG1 is obtained from the difference? PR5sa-ΔPR12sa of the gap G1A.

The output of the first sensor 21b on the other side and the output of the second sensor 22b on the other side are used to calculate the variation amount G1B of the gap dimension G1B of the other end KG1B of the first gap KG1, (? G1B). Specifically, since? G1B = - (? R1 +? R2) =? PR5sb -? PR12sb, the fluctuation amount? PR5sb detected by the first sensor 21b on the other side and the fluctuation amount The variation amount? G1B of the gap dimension G1B of the other end KG1B of the first gap KG1 is obtained from the difference? PR5sb -? PR12sb of the gap?

7, the coating apparatus 10 is configured so that the third sensor 23 and the fourth sensor 24 are disposed on the third roll 13 along the third roll central axis 13ax One end 13A of one side HX13A (left side in Fig. 7) of the three roll axis direction HX13 and the other side HX13B (right side in Fig. 7) of the third roll axis direction HX13 And one pair at the other end 13B. That is, the application device 10 includes a third sensor 23a on one side and a fourth sensor 24a on the one side, which are disposed to face each other via one end 13A of the third roll 13, And a third sensor 23b on the other side and a fourth sensor 24b on the other side opposed to each other via the other end portion 13B of the second sensor 13.

Therefore, by using the outputs of the one-side third sensor 23a and the one-side fourth sensor 24a, the gap dimension G2A (also referred to as the gap G2A) of the one end portion KG2A of the second gap KG2 4, see Fig. 8). Specifically, since? G2A = - (? R2 +? R3) =? PR6sa -? PR2sa, the fluctuation amount? PR6sa detected by the one third sensor 23a and the fluctuation amount A variation amount? G2A of the gap dimension G2A of the one end portion KG2A of the second gap KG2 is obtained from the difference? PR6sa -? PR2sa of the second gap KG2.

The output of the third sensor 23b on the other side and the output of the fourth sensor 24b on the other side are used to calculate the variation G2B of the gap dimension G2B of the other end KG2B of the second gap KG2, (? G2B). Specifically, since? G2B = - (? R2 +? R3) =? PR6sb -? PR2sb, the fluctuation amount? PR6sb detected by the third sensor 23b on the other side and the fluctuation amount A variation amount? G2B of the gap dimension G2B of the other end KG2B of the second gap KG2 is obtained from the difference? PR6sb -? PR2sb of the gap G2B.

1 and 12) of the present embodiment uses the output of each of the sensors 21 to 24 in the control unit 27 and controls the first and third roll moving mechanisms The first roll 11 or the third roll 13 is intermittently moved using the first gap KG1 or the second gap KG2 due to the thermal expansion of each of the rolls 11 to 13, ) Is canceled.

Before describing the contents of the control, the first and third roll moving mechanisms 25 and 26 will be described. As shown in Fig. 6, the coating apparatus 10 of the present embodiment is provided with a device 11 for moving the first roll 11 in the first direction H21 (vertically in Fig. 6, leftward and rightward in Fig. 4) 1 roll moving mechanism 25 (25a, 25b). Concretely, one end 11A of the first roll 11 on one side HX11A (left side in Fig. 6) of the first roll axis direction HX11 along the first roll center axis 11ax And a first-side first roll moving mechanism 25a for moving the first roll moving mechanism 25a in the first direction H21. The other first roll moving mechanism 25b for moving the other end portion 11B of the other side HX11B (right side in Fig. 6) of the first roll axial direction HX11 in the first direction H21, .

8, the coating apparatus 10 of the present embodiment is provided with a third roll 13 for moving the third roll 13 in the second direction H23 (vertically in Figs. 8 and 4) And mechanisms 26 (26a, 26b). Concretely, one end 13A of the third roll 13 (one side in FIG. 8) HX13A (in the third roll axis direction HX13) along the third roll center axis 13ax And a one-side third roll moving mechanism 26a for moving the rollers in the second direction H23. The other third roll moving mechanism 26b for moving the other end portion 13B of the other side HX13B (right side in Fig. 8) of the third roll axial direction HX13 in the second direction H23 I have.

12, the control unit 27 of the application device 10 includes a CPU (central processing unit) 281, a ROM 282 storing a predetermined program, a RAM 283, an input / output circuit 285 and a bus 284 to which they are connected. Outputs from the sensors 21a and 21b to 24a and 24b are input to the bus 284 and output to the respective roll moving mechanisms 25a to 26b indicating the amounts of these movements. The CPU 281 controls the first gap variation detection unit 271, the second gap variation detection unit 272, the first roll movement instruction unit 273, the third roll movement instruction unit 274, and an adjustment unit 275. [

The coating apparatus 10 of the present embodiment is so constructed as to offset the variation amount? G1A of the gap dimension G1A with respect to the one end portion KG1A of the first gap KG1 calculated as described above, The one end 11A of the first roll 11 is moved in the first direction H21 by using the one roll moving mechanism 25a. Thus, the gap dimension G1A with respect to the one end KG1A of the first gap KG1 is kept substantially constant. Likewise, the other first roll moving mechanism 25b is moved so as to cancel the variation amount? G1B of the gap dimension G1B with respect to the other end portion KG1B of the first gap KG1 calculated as described above The other end portion 11B of the first roll 11 is moved in the first direction H21. In this way, the gap dimension G1B with respect to the other end KG1B of the first gap KG1 is also kept substantially constant. The fluctuation of the gap dimension G1 of the first clearance KG1 caused by the thermal expansion of the first roll 11 and the second roll 12 can be changed over the entirety of the second roll axial direction HX12, The clearance dimension G1 of the first clearance KG1 is maintained substantially constant and the first clearance KG1 caused by the thermal expansion is canceled by the movement of the first roll 11 in the first direction H21, Can be prevented from being accumulated.

It is also possible to use the one side third roll moving mechanism 26a so as to cancel the variation amount G2A of the gap dimension G2A with respect to the one end portion KG2A of the second gap KG2 calculated as described above And the one end 13A of the third roll 13 is moved in the second direction H23. Thus, the gap dimension G2A with respect to the one end KG2A of the second gap KG2 is kept substantially constant. Similarly, the other third roll moving mechanism 26b is moved so as to cancel the variation amount? G2B of the gap dimension G2B with respect to the other end portion KG2B of the second gap KG2 calculated as described above The other end portion 13B of the third roll 13 is moved in the second direction H23. In this way, the gap dimension G2B with respect to the other end KG2B of the second gap KG2 is also kept substantially constant. The fluctuation of the gap dimension G2 of the second gap KG2 caused by the thermal expansion of the second roll 12 and the third roll 13 can be changed over the entirety of the third roll axis direction HX13, The clearance dimension G2 of the second gap KG2 is maintained substantially constant and the second gap KG2 caused by the thermal expansion is canceled by the movement of the third roll 13 in the second direction H23, Can be prevented from being accumulated.

More specifically, the non-dried active material layer 6 is coated on one surface 2s (2sa) of the current collector foil 2 supplied from the current collector foil roll 2RL to form an undried electrode plate 7 In the application step S1 (see Fig. 2), the following steps S11 to S15 are carried out (see Fig. 3). In the coating device 10 of the present embodiment, as described above, a pair of roll moving mechanisms 25 and 26 is formed on one side and the other side of each of the sensors 21 to 24, The gap sizes G1A and G1B on one side and the other side of the first gap KG1 and the gap dimensions G2A and G2B on one side and the other side of the second gap KG2 are set to be independent . Therefore, in order to avoid redundant description, the following description will be made without distinguishing one side and the other side.

First, in step S11, which is a detection process, a first gap (KG1) generated during the detection period DT (n) repeatedly formed due to thermal expansion occurring in the first roll 11 and the second roll 12 (G1 (G1A, G1B)) of the gap dimension G1 of each of the plurality of sensor elements (G1, G2) in the detection period DT (n). The thermal expansion occurring in the second roll 12 and the third roll 13 causes a variation amount? G2 of the gap dimension G2 of the second gap KG2 generated during the detection period DT (n) (? G2A,? G2B) is detected every detection period DT (n). Also, n is a natural number. The length of the detection period DT (n) is a predetermined length, specifically one minute in the present embodiment.

In this detecting process (step S11), the process shown in Fig. 3 is performed. More specifically, in step S111, a new detection period DT (n) is started. In step S112, the outputs (the first radial position PR5s and the second radial position PR12s) of the first sensor 21 and the second sensor 22 input through the input / output circuit 285 are used , The gap dimension G1 of the first gap KG1 at each time point is calculated including the time point at which the detection period DT (n) starts. In step S113, the outputs (the third radial position PR6s and the fourth radial position PR2s) of the third sensor 23 and the fourth sensor input through the input / output circuit 285 are used, The gap dimension G2 of the second gap KG2 at each point of time is calculated including the point of time at the beginning of the detection period DT (n).

In step S114, it is determined whether or not the detection period DT (n) has ended. If the detection period DT (n) is not completed (No), steps S112 and S113 are repeated. If the detection period DT (n) has ended (YES), the process proceeds to step S115.

In step S115, the gap size (G1) of the first gap (KG1) at each time point detected in step S112 is used to calculate the amount of variation (G1) of the gap dimension (G1) of the first gap ? G1 (? G1A,? G1B)). Specifically, the variation amount? G1 is calculated from the gap dimension G1 detected at the start of the detection period DT (n) and just before the end thereof. In step S116, the gap dimension G2 of the second gap KG2 at each time point detected in step S113 is used to calculate the gap dimension G2 of the second gap KG2 generated in the detection period (? G2 (? G2A,? G2B)). Specifically, the variation amount? G2 is calculated from the gap dimension G2 detected at the start of the detection period DT (n) and just before the end thereof.

Subsequently, in step S12, which is the first roll moving step, a change amount? G1 of the gap dimension G1 of the first gap KG1 generated in the detection period DT (n) detected in step S11 (step S115) , The first roll moving mechanism 25 is moved so as to cancel this, and the flow advances to step S14. In parallel with step S12 described above, in step S13 which is the third roll moving step, based on the variation amount? G2 of the gap dimension G2 of the second gap KG2 detected in step S11 (step S116) , The third roll moving mechanism 26 is moved so as to cancel it, and the flow advances to step S14.

After the end of the previous sensing period DT (n), the first roll moving mechanism 25 completes the movement of the first roll 11 and the third roll After the movement of the third roll 13 by the moving mechanism 26 is completed, the second roll 1/4 rotation time (TQ) when the second roll 12 rotates 1/4 elapses, It is determined whether or not the third roll &amp;thetas; 3 rotation time T &amp;thetas; 3 in which the third roll 13 rotates by the third angle [theta] 3 has elapsed. If it is before the elapse of the third roll &amp;thetas; 3 rotation time T &amp;thetas; 3 (in the case of NO in step S14), step S14 is repeated to wait for elapse of time. On the other hand, if it is an example in step S14, the process returns to step S11 (S111) via step S15 to start a new detection period DT (n + 1).

This adjustment process is provided for the following reasons. By completing the movement of the first roll 11, the gap dimension G1 of the first gap KG1 becomes a predetermined target dimension. When the movement of the third roll 13 is completed, the gap dimension G2 of the second gap KG2 becomes a predetermined target dimension. However, in order for the second roll top film 5 formed by the dimensionally changed first gap KG1 to have a thickness TH5 of the target dimension to reach the second gap KG2, The elapsed time of the second roll 1/4 rotation time (TQ) required for 1/4 rotation of the second roll 12 is required. Further, in order to allow the non-dried active material layer 6 formed by the second gap KG2 to have a target thickness TH6 to be detected by the third sensor 13, It is necessary to elapse the third roll &amp;thetas; 3 rotation time T &amp;thetas; 3 that rotates by the third angle [theta] 3. In this adjustment process (step S14), the process waits for the elapse of the above described period and returns to step S111 to start the new detection period DT (n + 1). Thus, in the new detection period DT (n + From the beginning, the amounts of variation (? G1,? G2) of the gap sizes (G1, G2) can be obtained using the outputs of the first sensor (21) and the third sensor (23).

The timing for returning to the detection step (step S11) and starting the new detection period DT (n + 1) in this adjustment step (step S14) is the same as the timing for starting the first roll 11 And the second roll top film 5 formed by the dimensionally changed first gap KG1 (having the thickness TH5 of the target dimension) can be detected by the first sensor 21 The second roll? 1 rotation time T? 1 in which the second roll 12 rotates by the first angle? 1 has elapsed since the second roll? 1 rotation time T?

Subsequently, in step S15, it is detected whether or not the application of the non-dried active material layer 6 to the current collector foil 2 is completed. If it has not been terminated (NO), the flow returns to step S11 (step S111). On the other hand, when the application is completed (YES), the step S1 (coating step) is completed and the flow returns to the main routine (see Fig. 2).

As described above, when the active material layer 3 is formed on both surfaces of the current collector foil 2, the coating device 10 again applies the coating liquid to the other side of the current collector foil 2 in the coating step S3. A non-dried active material layer 6 is coated on the front surface (back surface) 2sb to form an undersized electrode plate 7. In this case, the same process as described above is performed, and the back side is also dried in step S4.

By doing so, it is possible to keep the gap dimension G1 of the first gap KG1 substantially constant, and to prevent accumulation of fluctuations in the first gap KG1 caused by thermal expansion. It is also possible to keep the gap dimension G2 of the second gap KG2 substantially constant and to prevent accumulation of fluctuations in the second gap KG2 caused by thermal expansion. Will be described in detail with reference to Figs. 13 and 14. Fig. 13 is a graph showing the time variation of the gap dimension G1 of the first gap KG1. It is assumed that the gap dimension G1 of the first gap KG1 is initially a predetermined target gap dimension G10. It is assumed that the active material paste 4 is supplied to the first clearance KG1 and the detection period DT (1) starts from the time t1. 14 is a graph showing the time variation of the gap dimension G2 of the second gap KG2. It is assumed that the gap dimension G2 of the second gap KG2 is initially a predetermined target gap dimension G20.

The first and second rolls 11 and 12 thermally expand due to friction with the lapse of time. Therefore, as shown by the broken line in Fig. 13, the gap dimension G1 of the first gap KG1 gradually decreases with time. That is, the effects of thermal expansion of the first and second rolls 11 and 12 are accumulated. Then, with the lapse of time, the thickness TH5 of the second roll top film 5 formed on the second roll 12 is also reduced (thinned), which is not preferable.

The third roll 13 also thermally expands due to friction with the lapse of time. Therefore, as shown by the broken line in Fig. 14, the gap dimension G2 of the second gap KG2 also gradually decreases with time. That is, the influence of the thermal expansion of the second and third rolls 12 and 13 is accumulated. Then, with the lapse of time, the thickness TH6 of the non-dried active material layer 6 formed on the current collector foil 2 also decreases (becomes thinner), which is not preferable.

In the coating device 10 of the present embodiment, as described above, the output of the first sensor 21 and the output of the second sensor 22 are used to determine the gap size G1 of the first gap KG1 The fluctuation amount? G1 is canceled every detection period DT (n). When the detection period DT (1) ends at the time t2 after the elapse of the predetermined time from the time t1, the variation amount? G1 is calculated and the first roll movement mechanism 25 is used to calculate the variation amount? 11 is moved, and the fluctuation of the gap dimension G1 of the first gap KG1 is canceled. That is, as shown by the solid line in Fig. 13, the gap dimension G1 is returned to the target gap dimension G10 (G1 = G10). Further, since the thermal expansion of the first and second rolls 11 and 12 continues thereafter, again, the gap dimension G1 decreases with time.

The coating device 10 of the present embodiment detects the variation amount? G2 of the gap dimension G2 of the second gap KG2 using the outputs of the third sensor 23 and the fourth sensor 24 Is canceled every time period DT (n). When the detection period DT (1) ends at the time t2 after a predetermined time from the time t1, the variation amount? G2 is calculated and the third roll movement mechanism 26 is used to calculate the variation? 13), and cancels the fluctuation of the gap dimension G2 of the second gap KG2. That is, as shown by the solid line in Fig. 14, the gap dimension G2 is returned to the target gap dimension G20 (G2 = G20). Further, since the thermal expansion of the second and third rolls 12 and 13 continues, again, the gap dimension G2 decreases with time.

3), the movement of the first roll 11 by the first roll moving mechanism 25 is completed, and the movement of the third roll moving mechanism 26 is completed, as described above with reference to Step S14 At the time t3 after the second roll 1/4 rotation time TQ elapses after the completion of the movement of the third roll 13 by the third roll 13 and the rotation time T? And starts the next new detection period DT (2). That is, as shown in Figs. 13 and 14, the adjustment period CT (1) is placed between the two detection periods DT (1) and DT (2).

Thereafter, in the same manner, the detection period DT (n) and the adjustment period CT (n) are alternately formed, and the gap size G1 of the first gap KG1 The first roll 11 is moved so as to cancel the variation amount? G1. 13, the gap dimension G1 of the first gap KG1 is set to the target gap dimension G10 at any time point, as shown by the solid line in Fig. 13, It is possible to prevent the cumulative variation of the first gap KG1 due to the thermal expansion from being accumulated. In this way, the thickness TH5 of the second roll top film 5 formed on the second roll 12 can be maintained at a substantially constant value.

Similarly, the third roll 13 is moved so as to cancel the variation amount? G2 of the gap dimension G2 of the second gap KG2 every detection period DT (n). In the coating device 10 of the present embodiment, as shown by the solid line in Fig. 14, the gap dimension G2 of the second gap KG2 at any time is set to be substantially constant close to the target gap dimension G20 And it is possible to prevent accumulation of fluctuations in the second gap KG2 due to thermal expansion. Thus, the thickness TH6 of the non-dried active material layer 6 formed on the current collecting foil 2 can be set to a substantially constant value even in the width direction WH and the longitudinal direction EH of the current collector foil 2 . The thickness of the active material layer 3 on which the non-dried active material layer 6 is dried can be kept substantially constant in both the width direction WH of the current collecting foil 2 and the longitudinal direction EH.

The gap between the first gap KG1 generated during the detection period DT (n) due to the thermal expansion occurring in the first roll 11 and the second roll 12 in the detection process (step S11) The variation amount? G1 of the dimension G1 is set to the first radial position PR5s of the coating film surface 5s of the second roll top film 5 which is detected by the first sensor 21, The CPU 281 for detecting the detection period DT (n) by using the second radial position PR12s of the second roll surface 12s detected by the first gap variation detection unit 271, .

The gap size of the second gap KG2 generated during the detection period DT (n) due to the thermal expansion occurring in the second roll 12 and the third roll 13 in the detection process (step S11) The third radial position PR6s of the layer surface 6s of the non-dried active material layer 6 (paste layer) detected by the third sensor 23 and the fourth radial position PR6s of the layer surface 6s detected by the third sensor 23, The CPU 281 for detecting every fourth detection period DT (n) using the fourth radial position PR2s of the outer diameter side surface 2sa of the current collecting foil 2 detected by the sensor 24, 2 gap variation detecting unit 272. [

In order to offset the variation amount? G1 of the first gap KG1 detected by the first gap variation detection unit 271 toward the first roll movement mechanism 25, The CPU 281 for instructing the movement of the first roll 11 is equivalent to the first roll movement instructing unit 273. [

In the same way, the third roll moving mechanism 26 is moved in the second direction H23 so as to offset the fluctuation amount? G2 of the second gap KG2 detected by the second gap variation detection unit 272, The CPU 281 for instructing the movement of the first roll movement instruction unit 13 corresponds to the third roll movement instruction unit 274.

After completion of the previous detection period DT (n), the movement of the first roll 11 by the first roll moving mechanism 25 is completed and the movement of the third roll moving mechanism 26 Rotation time TQ elapses after the completion of the movement of the third roll 13 by the rotation of the third roll 13 and after the lapse of the third roll? 3 rotation time T? DT (n + 1)) is equivalent to the adjustment unit 275. [ In the adjustment section 275 in the present embodiment, after the previous detection period DT (n) is completed, the movement of the first roll 11 by the first roll movement mechanism 25 is completed , And then the new detection period DT (n + 1) is started after the second roll? 1 rotation time T? 1 elapses after the second roll 12 rotates by the first angle? 1 .

(Modification 1)

Next, a coating apparatus 110 according to the first modification of the above-described embodiment and a manufacturing method of the un-dried electrode plate 7 using the coating apparatus will be described with reference to Fig. In the coating device 10 of the embodiment, the fourth sensor 24 (24a, 24b) rotates the outer peripheral surface 2sa of the current collecting foil 2 wound around the third roll 13 in the fourth radial direction And the position PR2s was detected (see Fig. 4). On the other hand, in the coating device 110 of the first modified embodiment, as shown in Fig. 15, the winding shape of the current collecting foil 2 with respect to the third roll 13 is different, and the fourth sensor 24 (24a And 24b) detect the fourth radial position PR13s of the third roll surface 13s of the third roll 13, as shown in Fig.

As can be easily understood from Fig. 15, in the coating device 110 of the first modified embodiment, the fourth roll 24 of the third roll 13, which is detected by the fourth sensor 24, The variation amount? PR13s in which the radial position PR13s occurred in the detection period is the same as the variation amount? R3 in the radius R3 of the third roller 13 generated during the detection period (? PR13s =? R3). This is because in the embodiment the fluctuation amount DELTA PR2s in which the fourth radial position PR2s of the outer diameter side surface 2sa of the current collecting foil 2 to be detected by the fourth sensor 24 occurs in the detection period, R3 of the radius R3 of the third roll 13 generated during the period.

Therefore, the output of the third sensor 23 and the output of the fourth sensor 24 can be used to calculate the variation? G2 of the gap dimension G2 of the second gap KG2 generated during the detection period. Specifically, in the same manner as in the embodiment, since? G2 = - (? R2 +? R3) =? PR6s -? PR13s, the variation amount? PR6s obtained from the output of the third sensor 23, It can be seen that the variation amount? G2 of the gap dimension G2 can be obtained from the difference (? PR6s -? PR13s) of the variation amount? PR13s obtained from the output. Hereinafter, it can be considered the same as the coating apparatus 10 of the embodiment.

Thus, in the coating apparatus 110 of the first modified embodiment, the variation amount? G2 of the gap dimension G2 is obtained by using the outputs of the third sensor 23 and the fourth sensor 24, and the detection period DT ( n), the third roll 13 is moved so as to offset the variation amount? G2 of the gap dimension G2 of the second gap KG2. Thus, accumulation of fluctuations in the second gap KG2 due to thermal expansion can be prevented. Thus, the thickness TH6 of the non-dried active material layer 6 formed on the current collector foil 2 can be maintained at a substantially constant value in the width direction WH and the longitudinal direction EH of the current collector foil 2 . The thickness of the active material layer 3 on which the non-dried active material layer 6 is dried can be kept substantially constant in the width direction WH and the longitudinal direction EH of the current collecting foil 2.

(Modification 2)

Next, a coating apparatus 310 related to the second modification and a method for manufacturing the un-dried electrode plate 7 using the same will be described. The coating device 310 of the second modified embodiment differs from the coating device 10 of the embodiment in that the control part is different and the other parts are the same. The manufacturing method of the undersurface electrode plate 7 of the second modified embodiment differs from that of the first embodiment in the detection process, and is otherwise identical. Therefore, the description will focus on the differences from the embodiment, and the description of the same points will be omitted or simplified.

The coating apparatus 310 of the second modified embodiment is provided with the first roll 11, the second roll 12, the third roll 13 and the first sensor 21 (21a, 21b ) To fourth sensors 24 (24a and 24b), a first roll moving mechanism 25 (25a and 25b) and a third roll moving mechanism 26 (26a and 26b). Unlike the embodiment, the coating apparatus 310 of the second modified embodiment has a control unit 327 (see Figs. 1, 12, and 16). The control unit 327 is a computer having a central processing unit (CPU) 381, a ROM 382 storing a predetermined program, a RAM 383, an input / output circuit 285, . The CPU 381 controls the first gap variation detection unit 371, the second gap variation detection unit 372, the first roll movement instruction unit 373, the third roll movement instruction unit 374, And functions as an adjustment unit 375 (see Fig. 12).

Also in this second modification, similarly to the embodiment, the active material paste 4 is a coating material obtained by mixing active material particles as a solute, a binder and a solvent, and uses a coating material composed of a plurality of wetting assemblies. Here, the wet assembly refers to a substance (grains) formed by aggregating (binding) a solvent in the state that the solvent is retained (absorbed) by the particles of the solute. The wetting assembly constituting the active material paste 4 is formed by mixing active material particles, a binder and a solvent. This wet assembly is a substance (grains) formed by aggregating (binding) the solvent in a state where the solvent is held (absorbed) in the active material particles and the binder.

In the second modification of the present embodiment, the first sensor 21 (one sensor 21a on the one side and the first sensor 21b on the other side) The pre-start radial position, which is the second radial position PR12s (PR12sa and PR12sb) of the second roll surface 12s in the first angular position AG1, measured by the first sensor 21 ( (The first sensor 21a on one side and the first sensor 21b on the other side). It is to be noted that before starting the production of the electrode plate 1, it is preferable that before the production of the electrode plate 1, the second angle (the second angle) measured by the second sensor 22 (the one sensor 22a and the second sensor 22b) Start radial position of the second roll surface 12s at the position AG2 in the second radial direction PR12s (PR12sa and PR12sb) is set to the second sensor 22 22a) and the second sensor 22b on the other side) (refer to Fig. 16).

It is to be noted that, in the second modification of the present embodiment, before the production of the electrode plate 1 is started, the third sensor 23 (the third sensor 23a on the one side and the third sensor 23b on the other side) Of the third roll surface 13s in the third angular position AG3 is the third radial position PR6s (PR6sa and PR6sb) of the third roll surface 13s measured by the third sensor 23 (The third sensor 23a on one side and the third sensor 23b on the other side). It is to be noted that before starting the production of the electrode plate 1, it is preferable that the angle of the fourth sensor 24 Start radial position, which is the fourth radial position PR13s (PR13sa and PR13sb) of the third roll surface 13s in the position AG4, to the fourth sensor 24 (one side fourth sensor 24a) and the fourth sensor 24b on the other side) (refer to Fig. 16).

The supply of the active material paste 4 to the first gap KG1 is started to form the active material paste 4 while compressing the active material paste 4 between the first roll 11 and the second roll 12 The reaction force of the compressive force acting on the active material paste 4 when forming the film while compressing the active material paste 4 between the first roll 11 and the second roll 12) , And acts on the first roll (11) and the second roll (12). A large machining reaction force is suddenly applied to the first roll 11 and the second roll 12 immediately after the start of machining so that the machining reaction force between the first roll 11 and the second roll 12 The first roll 11 and the second roll 12 may move in the first direction H21 (left-right direction in Fig. 16) so that the gap dimension G1 of the gap 1 is increased.

Specifically, the central axis 11ax of the first roll 11 is displaced in a direction away from the second roll 12 (leftward in Fig. 16), and the central axis 12ax of the second roll 12 is displaced In the direction away from the first roll 11 (toward the right in Fig. 16). Particularly, when a coating material comprising a wet assembly having a high solid content (a small amount of solvent) is used as the active material paste 4, the processing reaction force becomes large, and the positional deviation of the first roll 11 and the second roll 12 . Accordingly, the gap dimension G1 of the first gap KG1 between the first roll 11 and the second roll 12 fluctuates.

It is also possible to prevent the first roll 11 and the second roll 12 from being damaged by the frictional heat generated in the vicinity of the first gap when the operation for forming the film is started while compressing the active material paste 4 between the first roll 11 and the second roll 12. [ The second roll thermally expands. Particularly, when a coating material composed of a wet assembly having a high solid content (a small amount of solvent) is used as the active material paste 4, the amount of frictional heat generated increases and the thermal expansion of the first roll 11 and the second roll 12 . This thermal expansion also changes the gap dimension G1 of the first gap KG1 between the first roll 11 and the second roll 12.

Most of the positional deviation of the first roll 11 and the second roll 12 due to the processing reaction force is caused by the positional deviation of the second roll 12 from 1 (For example, from the start of machining to the rotation speed of the second roll 12) until the thermal expansion of the first roll 11 and the second roll 12 occurs 30 revolutions) (even if it occurs, the positional deviation is negligible). Therefore, after the clearance dimension G1 of the first clearance KG1 has changed due to the positional deviation of the first roll 11 and the second roll 12 due to the processing reaction force, It can be considered that the gap dimension G1 of the first gap KG1 varies with the thermal expansion of the second roll 12.

Therefore, in the second modified example, after the gap dimension G1 of the first gap KG1 varies with the positional deviation of the first roll 11 and the second roll 12 due to the processing reaction force The gap dimension G1 of the first gap KG1 before the thermal expansion of the roll 11 and the second roll 12 is started is set to the gap dimension G1 of the target first gap KG1 The gap size G1 of the first gap KG1 is set to the gap target value G1T from the first gap target value G1T during the detection period DT (n) The fluctuation amount that was caused by the thermal expansion of the first roll 11 and the second roll 12 was calculated as the variation amount? Thereafter, the first roll 11 is moved by the first roll moving mechanism 25 so as to offset the variation amount? G1 so that the gap size G1 of the first gap KG1 is set to the first gap target value G1T).

That is, in the second modified example, after the gap dimension G1 of the first gap KG1 varies with the positional deviation of the first roll 11 and the second roll 12 due to the processing reaction force The gap size G1 before the roll 11 and the second roll 12 are thermally expanded is set as the adjustment target value of the gap dimension G1 (the first gap target value G1T) The feedback control is performed such that the gap dimension G1 of the gap KG1 becomes the first gap target value G1T. By doing so, the thickness TH5 of the coating film (the second roll top film 5) formed by passing between the first roll 11 and the second roll 12 is made to be the same as the thickness The gap target value G1T or a dimension close to the gap target value G1T.

The above description also applies to the gap dimension G2 of the second gap KG2. Therefore, in the second modified example, after the gap dimension G2 of the second gap KG2 varies with the positional deviation of the second roll 12 and the third roll 13 due to the processing reaction force The gap dimension G2 of the second gap KG2 before the roll 12 and the third roll 13 thermally expand is set to be smaller than the gap dimension G2 of the target second gap KG2 And the gap dimension G2 of the second gap KG2 is set to be larger than the gap target value G2T from the second roll 12 and the second gap target G2T during the detection period DT (n) 3, the amount of fluctuation caused by the thermal expansion of the roll 13 is calculated as the amount of change? G2. The third roll 13 is moved by the third roll moving mechanism 26 so as to offset the variation G2 so that the gap dimension G2 of the second gap KG2 is set to the second gap target value G2T ).

That is, in the second modification, after the second clearance KG2 has changed due to the positional deviation of the second roll 12 and the third roll 13 due to the processing reaction force The gap size G2 of the second gap KG2 before the third roll 13 is thermally expanded is set as the adjustment target value (second gap target value G2T) of the gap dimension G2, And the gap dimension G2 of the second gap KG2 is the second gap target value G2T. By doing so, the thickness TH7 of the sheet (not-yet-dried electrode plate 7) having the paste layer formed by passing between the second roll 12 and the third roll 13 can be made to fall within the entire production period The second gap target value G2T or a dimension close to the second gap target value G2T. Therefore, the thickness TH6 of the paste layer (the non-dried active material layer 6) is changed from the second gap target value G2T to the thickness TH2 of the base sheet (current collecting foil 2) (TH6 = G2T - TH2), or a dimension close to this dimension.

Here, a method of manufacturing the electrode plate according to Modification 2 will be described. First, as shown in Figs. 1 and 2, on one surface 2s (2sa) of the current collector foil 2 supplied from the current collector foil roll 2RL in the step T1 (coating step) The layer 6 is applied to form a non-dried electrode plate 7. Specifically, when the supply of the active material paste 4 is started to the first clearance KG1, the process of step T11 (detection process) (see FIG. 17) is performed first. More specifically, as shown in Fig. 17, first, in step T111, the second gap variation detection unit 372 determines whether or not the rotation torque of the third roll 13 is equal to or greater than a specified value. The rotational torque of the third roll 13 is measured by a torque sensor (not shown), and the second gap variation detecting unit 372 acquires the measured value and determines whether or not the measured value is equal to or greater than a specified value.

Here, the specified value of the rotational torque of the third roll 13 is set such that when the second roll top film 5 and the non-dried active material layer 6 do not exist in the second gap KG2 (idle running state) And the value of the rotational torque when the leading end of the second roll top film 5 reaches (enters) the second gap KG2. Therefore, when the rotational torque of the third roll 13 becomes equal to or greater than the specified value, it can be determined that the leading end of the second roll top film 5 reaches (enters) the second gap KG2.

If it is determined in step T111 that the rotational torque of the third roll 13 is equal to or greater than the specified value (YES), the process proceeds to step T112. In step T112, the second gap variation detecting unit 372 detects The detection of the number of revolutions is started. The number of revolutions of the third roll 13 is obtained by measuring the number of revolutions of the motor 47 (refer to Fig. 20) that drives the rotation of the third roll 13. Then, the process advances to step T113 to start the detection of the number of revolutions of the third roll 13 (that is, after the leading end of the non-dried active material layer 6 reaches the second gap KG2) It is determined whether or not the roll 13 has made one turn.

After the supply of the active material paste 4 is started to the first clearance KG1 and the rotational torque of the third roll 13 becomes equal to or greater than a specified value, The second roll 12 is rotated after the second roll 12 has been rotated by the first angle? 1 or more since the supply of the active material paste 4 is started to the first clearance KG1, Quot; is greater than the predetermined number of revolutions of the first roll 12 when the second roll top film 5 reaches the second gap KG2 for the first time, 3 &quot; and further, &quot; before the third roll 13 rotates by a predetermined number of revolutions &quot;.

If it is determined that the third roll 13 has made one revolution (YES), the process proceeds to step T114. Based on the instruction of the first gap variation detection unit 371, the first sensor 21 and the second sensor 22 measure the second roll diameter positions L11 and L21. The process proceeds to step T115 and the third roll diameter position L31 and the fourth roll position L41 are set by the third sensor 23 and the fourth sensor 24 on the basis of the command of the second gap variation detection unit 372 .

Concretely, the first sensor 21 (the first sensor 21a on one side and the first sensor 21b on the other side) detects the first diameter 21c of the coating film surface 5s of the second roll top film 5 (That is, the reference position (reference position)) of the coating film surface 5s with the above-described pre-start radial position as the reference position (zero reference) as the orientation position PR5s (PR5sa and PR5sb) The second roll radial distance of the coating film surface 5s from the pre-start radial position) is measured. The measured value by the one first-side sensor 21a is L11A and the measured value by the first-side first sensor 21b is L11B.

The second radial position of the second roll surface 12s of the second roll 12 is determined by the second sensor 22 (the one-side second sensor 22a and the second sensor 22b on the other side) Of the second roll surface 12s in the radial direction of the second roll surface 12s (in other words, in the pre-start radial direction as a reference position) (The roll radial distance L21 of the second roll surface 12s from the position). The measured value by the one second sensor 22a is L21A and the measured value by the second sensor 22b by the other is L21B.

The third sensor 23 (the third sensor 23a on the one side and the third sensor 23b on the other side) has a third diameter of the layer surface 6s of the non-dried active material layer 6 (paste layer) The third roll radial position L31 of the layer surface 6s of the non-dried active material layer 6, in which the above-described pre-start radial position is the reference position (zero reference), is set as the direction position PR6s , The third roll radial distance of the layer surface 6s from the pre-start radial position as the reference position) is measured by the third sensor 23a as L31A and the measured value by the third sensor 23a as L31A, 23b is L31B.

The fourth sensor 24 (the fourth sensor 24a on the one side and the fourth sensor 24b on the other side) detects the fourth diameter 24c of the outer surface 2sa of the diameter of the collector foil 2 The radial position L41 of the radially outer surface 2sa of the current collecting foil 2 with the aforementioned pre-start radial position as the reference position (zero reference) as the direction position PR2s (in other words, The third roll radial distance of the radially outer surface 2sa from the pre-start radial position as the reference position) is measured. It is also assumed that the measured value by the one side fourth sensor 24a is L41A and the measured value by the fourth side sensor 24b is L41B.

When the supply of the active material paste 4 is started to the first clearance KG1 and the rotational torque of the third roll 13 becomes equal to or more than the specified value, the second roll 12 and the third roll 13 are rotated, When the leading end of the second roll top film 5 enters the second gap KG2 between the two rolls. At this time, the second roll top film 5 is compressed between the second roll 12 and the third roll 13 to form a non-dried active material layer 6 (FIG. 6) on the outer diameter side 2sa of the current collector foil 2 And the machining reaction force acts on the second roll 12 and the third roll 13. In this case, The positional deviation of the second roll 12 and the third roll 13 occurs due to the processing reaction force and the gap dimension G2 of the second gap KG2 fluctuates. At this time, processing for forming the film (forming the second roll top film 5) while compressing the active material paste 4 between the first roll 11 and the second roll 12 has already been described , The positional deviation of the first roll 11 and the second roll 12 occurs due to the processing reaction force and the gap dimension G1 of the first gap KG1 fluctuates (enlarges).

After the supply of the active material paste 4 is started to the first clearance KG1 and the rotational torque of the third roll 13 becomes equal to or larger than a specified value, The amount of expansion of the first roll 11, the second roll 12 and the third roll 13 is very small even when thermal expansion has not occurred or thermal expansion has occurred yet It is negligible.

Therefore, the values of L11 measured by the first sensor 21 and L21 measured by the second sensor 22 are set such that the positional deviation of the first roll 11 and the second roll 12 due to the processing reaction force The thermal expansion of the first roll 11 and the second roll 12 occurs after the clearance dimension G1 of the first clearance KG1 changes and the thermal expansion of the first roll 11 and the second roll 12 occurs Which is very small and negligible).

The value of L31 measured by the third sensor 23 and the value of L41 measured by the fourth sensor 24 are set such that the positional deviation of the second roll 12 and the third roll 13 After the gap dimension G2 of the second gap KG2 has changed and the second roll 12 and the third roll 13 have thermally expanded (or even if thermal expansion has occurred), the amount of expansion Which is very small and negligible).

Subsequently, the flow advances to step T116 to obtain the values of L11 and L21 by the first gap variation detecting unit 371, and the values of L31 and L41 are acquired by the second gap variation detecting unit 372. [ Then, the process advances to step T117 to start the detection period DT (n) for a predetermined length (for example, one minute). Thereafter, the process proceeds to step T118 to determine whether the detection period DT (n) is to be terminated.

If it is determined in step T118 that the detection period DT (n) is ended (YES), the process proceeds to step T119. Based on the instruction of the first gap variation detection unit 371, the detection period DT (n) The second roll diameter position L12 and the second roll position L22 are measured by the first sensor 21 and the second sensor 22 at the end of the second roll. At the end of the detection period DT (n), on the basis of the command of the second gap variation detection section 372, the third sensor 23 and the fourth sensor 24 generate 3 Measure the roll radial position (L32 and L42).

Concretely, the first sensor 21 (the first sensor 21a on one side and the first sensor 21b on the other side) detects the first diameter 21c of the coating film surface 5s of the second roll top film 5 The second roll radial position L12 (in other words, the reference position (reference position)) of the coating film surface 5s with the above-described pre-start radial position as the reference position The second roll radial distance of the coating film surface 5s from the pre-start radial position) is measured. The measured value by the first sensor 21a on one side is L12A, and the measured value by the first sensor 21b on the other side is L12B.

The second radial position of the second roll surface 12s of the second roll 12 is determined by the second sensor 22 (the one-side second sensor 22a and the second sensor 22b on the other side) (In other words, a reference position in the pre-start radial direction (in other words, a reference position in the pre-start radial direction) of the second roll surface 12s, The roll second roll radial distance of the second roll surface 12s from the position). The measured value by the one second sensor 22a is L22A and the measured value by the second sensor 22b by the other is L22B.

The third sensor 23 (the third sensor 23a on the one side and the third sensor 23b on the other side) has a third diameter of the layer surface 6s of the non-dried active material layer 6 (paste layer) The third roll radial position L32 of the layer surface 6s of the non-dried active material layer 6 in which the above-described pre-start radial position is set as the reference position (zero reference) as the direction position PR6s (in other words, , The third roll diameter direction distance of the layer surface 6s from the pre-start radial position which is the reference position) is measured. Further, the measured value by the one third sensor 23a is L32A, the third sensor 23b is L32B.

The fourth sensor 24 (the fourth sensor 24a on the one side and the fourth sensor 24b on the other side) is arranged in the fourth radial direction of the outer diameter surface 2sa of the current collector foil 2 The third roll diameter position L42 of the outer diameter side surface 2sa of the current collecting foil 2 with the aforementioned pre-start radial position as the reference position (0 reference) (in other words, (The third roll radial distance of the radially outer surface 2sa from the pre-start radial position, which is the position of the fourth sensor 24a, 24b) is L42A, the measured value by the fourth sensor 24a on one side is L42A, ) Is defined as L42B.

The first roll 11, the second roll 12, and the third roll 13 (not shown) are used at the end of the detection period DT (n), that is, at the time of measurement of L12, L22, L32, ) Is believed to be thermally expanding. Therefore, the value of L12 measured by the first sensor 21 and the value of L22 measured by the second sensor 22 are determined by the first roll 11 and the second roll 12 by the processing reaction force, After the clearance dimension G1 of the first clearance KG1 has changed with the positional deviation of the first clearance KG1 and the thermal expansion of the first and second rolls 11 and 12 has occurred. The value of L32 measured by the third sensor 23 and the value of L42 measured by the fourth sensor 24 are the same as those of the second roll 12 and the third roll 13, After the clearance dimension G2 of the second clearance KG2 has changed with the positional deviation of the second gap 12 and the thermal expansion of the second roll 12 and the third roll 13. [

Next, in step T121, the first gap variation detection unit 371 acquires the values of L12 and L22, and the second gap variation detection unit 372 acquires the values of L32 and L42. Thereafter, in the step T122 (the amount of variation (ΔG1) calculating step), the first gap variation detecting unit 371 calculates the gap size of the first gap KG1 generated within the sensing period DT (n) (G1) is calculated. More specifically, as the variation amount? G1, the variation amount? G1A of the gap dimension G1A of the one end portion KG1A of the first gap KG1 and the gap amount? G1A of the gap dimension KG1B of the first gap KG1 And calculates the variation amount? G1B of the difference G1B.

In the second modification, ΔG1 = (L12-L22) - (L11-L21). Specifically, the variation amount? G1A of the gap dimension G1A at the one end KG1A of the first gap KG1 is calculated using the relational expression? G1A = (L12A - L22A) - (L11A - L21A). The variation amount? G1B of the gap dimension G1B of the other end KG1B of the first gap KG1 is calculated using the relational expression? G1B = (L12B - L22B) - (L11B - L21B).

The above relational expression is derived as follows. First, the set value of the gap dimension G1 of the first gap KG1 (the gap dimension G1 of the first gap KG1 before starting the production of the electrode plate 1) is G1S. The positional shift amount of the first roll 11 moved (displaced) in the first direction H21 by the processing reaction force is set to DELTA X1 (see Fig. 16). Specifically, the position shift amount of the one end portion 11A of the first roll 11 is DELTA X1A and the position shift amount of the other end portion 11B is DELTA X1B. Further, the increase amount of the radius R1 due to the thermal expansion of the first roll 11 is set to DELTA R1 (see Fig. 9). Specifically, the increase amount at the one end portion 11A of the first roll 11 is? R1A and the increase amount at the other end portion 11B is? R1B.

The positional shift amount of the second roll 12 moved (displaced) in the first direction H21 by the processing reaction force is defined as DELTA X2. Specifically, the displacement amount of the one end portion 12A of the second roll 12 is DELTA X2A, and the displacement amount of the other end portion 12B is DELTA X2B. The positional shift amount of the second roll 12 moved (displaced) in the second direction H23 by the processing reaction force generated between the second roll 12 and the third roll 13 is represented by DELTA Y2 do. Specifically, the displacement amount of the one end 12A of the second roll 12 is DELTA Y2A, and the displacement of the other end 12B is DELTA Y2B. The increase amount of the radius R2 by the thermal expansion of the second roll 12 is defined as DELTA R2. Specifically, the increase amount at the one end portion 12A of the second roll 12 is DELTA R2A and the increase amount at the other end portion 12B is DELTA R2B (see Figs. 9 and 16).

G1 = G1S + DELTA X1 + DELTA X2, where G1 is the gap dimension of the first gap KG1 when measuring L11 and L21 in step T114 (first initial detection process) (Equation 1). Further, L11 =? X2 cos? 1 +? Y2 sin? (Formula 2). In addition, L21 = -ΔX2 cos θ1 - ΔY2 sin θ1 - G1 = - ΔX2 cos θ1 - ΔY2 sin θ1 - (G1S + ΔX1 + ΔX2) (Equation 3). The gap dimension G1 of the first gap KG1 when measuring L12 and L22 in the step T119 (detection process at the end of the first period) is G1 = G1S +? X1 +? X2 -? R1 - (Equation 4).

Further, L12 =? X2 cos? 1 +? Y2 sin? (Equation 5). In addition, L22 = -ΔX2 cos θ1 - ΔY2 sin θ1 - ΔR2 - G1 = -ΔX2 cos θ1 - ΔY2 sin θ1 - ΔR2- (G1S + ΔX1 + ΔX2 - ΔR1 - ΔR2) (Equation 6). The values of L11, L21, L12 and L22 measured by the first sensor 21 and the second sensor 22 are set such that the reference position is set to 0 and the inner side of the second roll diameter direction Quot; positive value &quot;, and the outer side with respect to the second roll diameter direction than the reference position is &quot; negative value &quot;.

Here, the first gap target value G1T (the target value of the gap dimension G1 of the first gap KG1) is set to be larger than the gap dimension G1 of the first gap KG1 measured at L11 and L21 in step T114 (1), (2) and (3), G1T = G1S +? X1 +? (Equation 7).

When the radius R1 of the first roll 11 is increased by? R1 by thermal expansion and the radius R2 of the second roll 12 is increased by? R2 by thermal expansion, the clearance of the first gap KG1 Since the dimension G1N is equal to the gap dimension G1 of the first gap KG1 at the time of measurement of L12 and L22 in step T119, G1N = G1S +? X1 +? X2 -? R1 -? R2 = L12 - L22 + 2 (? X2 cos? 1 +? Y2 sin? (Equation 8).

The variation amount? G1 of the gap dimension G1 of the first gap KG1 generated within each sensing period DT (n) by the thermal expansion can be calculated from the equations (7) and (8) - G1T = (L12 - L22) - (L11 - L21). Therefore, a relational expression of? G1A = (L12A-L22A) - (L11A-L21A) can be obtained for the variation amount? G1A of the gap dimension G1A at one end KG1A of the first gap KG1. Further, a relational expression of? G1B = (L12B-L22B) - (L11B-L21B) can be obtained for the variation amount? G1B of the gap dimension G1B of the other end KG1B of the first gap KG1.

The gap size G2 of the second gap KG2 generated within the detection period DT (n) by the thermal expansion by the second gap variation detection unit 372 in the step T123 (the variation amount (ΔG2) calculation step) ) Is calculated. In the second modification, ΔG2 = (L42-L32) - (L41-L31).

The above relational expression is derived as follows. First, the set value of the gap dimension G2 of the second gap KG2 (the gap dimension G2 of the second gap KG2 before starting the production of the electrode plate 1) is G2S. The position shift amount of the third roll 13 moved (displaced) in the second direction H23 by the processing reaction force is represented by DELTA Y3. Specifically, the position shift amount of the one end portion 13A of the third roll 13 is? Y3A and the position shift amount of the other end portion 13B is? Y3B. The increment of the radius R3 due to the thermal expansion of the third roll 13 is defined as? R3. Specifically, the increase amount at the one end portion 13A of the third roll 13 is? R3A and the increase amount at the other end portion 13B is? R3B (see Figs. 9 and 16).

The positional shift amount of the second roll 12 moved (displaced) in the first direction H21 by the processing reaction force generated between the first roll 11 and the second roll 12 is represented by DELTA X2 . Specifically, the displacement amount of the one end portion 12A of the second roll 12 is DELTA X2A, and the displacement amount of the other end portion 12B is DELTA X2B. The positional shift amount of the second roll 12 moved (displaced) in the second direction H23 by the processing reaction force generated between the second roll 12 and the third roll 13 is represented by DELTA Y2 do. Specifically, the displacement amount of the one end 12A of the second roll 12 is DELTA Y2A, and the displacement of the other end 12B is DELTA Y2B. The increase amount of the radius R2 by the thermal expansion of the second roll 12 is defined as DELTA R2. Specifically, the increase amount at the one end 12A of the second roll 12 is DELTA R2A and the increase amount at the other end 12B is DELTA R2B. The thickness of the current collector foil 2 (substrate sheet) is assumed to be TH2 (see Figs. 9 and 16).

G2 = G2S + DELTA Y2 + DELTA Y3 - TH2 ... DELTA Y2 - DELTA Y2 - DELTA Y2 - DELTA DELTA Y2 - (Expression 11).

L31 =? Y3cos? 3 - TH2 - G2 =? Y3cos? 3 - TH2 - (G2S +? Y2 +? Y3 - TH2) (Expression 12). Further, L41 = - DELTA Y3 cos [theta] 3 - TH2 ... (13). G2 = G2S + DELTA Y2 + DELTA Y3 - TH2 - DELTA R2 - DELTA R3 (DELTA R2) When the L32 and L42 are measured in step T120 (detection process at the end of the second period), the gap dimension G2 of the second gap KG2 is G2 = ... (14).

? L3 =? Y3 cos? 3 - TH2 -? R3 - G2 =? Y3 cos? 3 - TH2 -? R3 - (G2S +? Y2 +? Y3 - TH2 -? R2 - (Equation 15). Further, L42 = -ΔY3 cosθ3 - TH2 - ΔR3 ... (Expression 16). The values of L31, L41, L32 and L42 measured by the second sensor 22 and the third sensor 23 are set such that the reference position is set to 0 and the inner side with respect to the third roll diameter direction Quot; positive value &quot;, and the outer side with respect to the third roll diameter direction than the reference position is &quot; negative value &quot;.

Here, the second gap target value G2T (the target value of the gap dimension G2 of the second gap KG2) is set to be larger than the gap dimension G2 of the second gap KG2 measured at L31 and L41 in step T115 G2 = G2S + DELTA Y2 + DELTA Y3 - TH2 = L41 - L31 + 2 DELTA Y3 cos &thetas; 3 by the above-mentioned (Expression 11), (Expression 12) (Equation 17).

The gap R2 of the second gap KG2 when the radius R2 of the second roll 12 is increased by? R2 by thermal expansion and the radius R3 of the third roll 13 is increased by? R3 by thermal expansion Since the dimension G2N is equal to the gap dimension G2 of the second gap KG2 measured at L32 and L42 at step T120, G2N = G2S +? Y2 +? Y3 - TH2 -? R2 -? R3 = L42 - L32 + 2? Y3 cos? (Equation 18).

The variation amount? G2 of the gap dimension G2 of the second gap KG2 generated within each detection period DT (n) by thermal expansion can be calculated from? G2 = G2N - G2T = (L42 - L32) - (L41 - L31). Therefore, a relational expression of? G2A = (L42A - L32A) - (L41A - L31A) can be obtained for the variation amount? G2A of the gap dimension G2A at one end KG2A of the second gap KG2. The relationship of? G2B = (L42B-L32B) - (L41B-L31B) can be obtained for the amount of change? G2B of the gap dimension G2B of the other end KG2B of the second gap KG2.

Next, as shown in Fig. 18, the process proceeds to step T12, where the amount of variation (G1) of the gap dimension G1 of the first gap KG1 generated in the detection period DT (n) detected in step T11 The first roll 11 is moved in the first direction H21 by the first roll moving mechanism 25 so as to cancel it. Specifically, based on a command from the first roll movement instructing section 373, the one-side first roll moving mechanism 25a rotates the one end 11A of the first roll 11 so as to cancel the variation? ) In the first direction (H21). The first roll moving mechanism 25b on the other side moves the other end 11B of the first roll 11 so as to cancel the variation G1B on the basis of the command of the first roll movement instructing section 373. [ Is moved in the first direction (H21).

As shown in Fig. 19, the one-side first roll moving mechanism 25a is configured such that the thickness becomes thinner toward the other side X11B (the right side in Fig. 19) of the first roll axial direction HX11 The wedge-shaped first portion 25a1 and the wedge-shaped second portion 25a2 that is thinner in thickness toward the one side X11A (left side in Fig. 19) of the first roll axial direction HX11 . The first portion 25a1 is configured to move in the first roll axis direction HX11 (left-right direction in Fig. 19) by driving of a motor (not shown). When the first portion 25a1 is moved in the first roll axis direction HX11 (the left-right direction in Fig. 19), the slope 25a3 of the first portion 25a1 is shifted to the second portion The slope 25a3 of the first portion 25a1 and the slope 25a2 of the second portion 25a2 are moved so as to move along the slope 25a4 in the first roll axial direction HX11 without being separated from the slope 25a4 of the first portion 25a1, Is slidably connected. The first portion H21A of the first portion H21A and the portion H21A of the second portion 25A2 of the first roll 11 are located on one side of the rotary shaft portion 35 of the first roll 11, (One side HX11A of the first roll axis direction HX11, the left side in Fig. 19).

Therefore, when the first portion 25a1 is moved in the first roll axis direction HX11 (left and right direction in Fig. 19) by driving of a motor (not shown), the slope 25a3 of the first portion 25a1 The slope 25a4 of the second portion 25a2 is moved in the first direction H21 (the up-and-down direction in Fig. 19) by moving in the first roll axial direction HX11 , Whereby the one end portion 11A of the first roll 11 moves in the first direction H21 (the up-and-down direction in Fig. 19). For example, when the first portion 25a1 is moved from the state shown in Fig. 19 to the other side HX11B (the right side in Fig. 19) of the first roll axial direction HX11, The slope 25a4 of the second portion 25a2 is pushed out to the one side H21A of the first direction H21 by the inclined surface 25a3 so that the first roll 11 Is moved to one side H21A (upper side in Fig. 19) of the first direction H21.

The first roll moving mechanism 25b on the other side also has the same structure as the one-side first roll moving mechanism 25a described above. Therefore, when the first portion 25b1 is moved in the first roll axial direction HX11 (left-right direction in Fig. 19) as in the one-side first roll moving mechanism 25a described above, the first portion 25b1 The slope 25b3 of the second portion 25b2 moves in the first direction H21 (see FIG. 19) by moving the slope 25b3 of the second portion 25b2 in the first roll axial direction HX11 So that the other end portion 11B of the first roll 11 moves in the first direction H21 (vertical direction in Fig. 19).

In this way, the one-side first roll moving mechanism 25a moves the one end portion 11A of the first roll 11 in the first direction H21 so as to cancel the variation amount? G1A (i.e., by? , The one end 11A of the first roll 11 is moved in the first direction H21). Further, the other-end first roll moving mechanism 25b moves the other end portion 11B of the first roll 11 in the first direction H21 so as to cancel the variation amount? G1B (i.e., by? G1B , The other end portion 11B of the first roll 11 is moved in the first direction H21).

Accordingly, the gap dimension G1 of the first gap KG1 can be adjusted (reversed) to the first gap target value G1T. In detail, the gap dimension G1A (see Fig. 19) of the one end KG1A of the first gap KG1 can be adjusted (reversed) to the one first gap target value G1TA. Further, the gap dimension G1B (see FIG. 19) of the other end KG1B of the first gap KG1 can be adjusted (reversed) to the other first gap target value G1TB. The first gap target value G1TA on the one side is the same as the gap dimension G1A of the one gap KG1A of the first gap KG1 measured in L11A and L21A in step T114. The first gap target value G1TB on the other side is the same as the gap dimension G1B of the other end KG1B of the first gap KG1 measured in L11B and L21B in step T114.

19, the rotary shaft portion 35 of the first roll 11 and the rotary shaft 37b of the drive motor 37 for rotating the first roll 11 are connected to each other by the Schmidt coupling 36, Respectively. The drive motor 37 is held and fixed by a bracket (not shown). With this structure, the first roll 11 (rotary shaft portion 35) can be moved independently of the drive motor 37 in the first direction H21 (up and down in Fig. 19) have. Even when the first roll center shaft 11ax and the center of the rotation shaft 37b of the drive motor 37 are displaced from each other by the movement of the rotary shaft portion 35 of the first roll 11, 37, the first roll 11 can be rotated appropriately.

On the basis of the variation amount? G2 of the gap dimension G2 of the second gap KG2 generated in the detection period DT (n) detected in step T11 (step T123) in step T13, The third roll 13 is moved by the third roll moving mechanism 26 in the second direction H23. More specifically, on the basis of a command from the third roll movement instructing section 374, the one end side third roll moving mechanism 26a moves the one end 13A of the third roll 13 ) In the second direction (H23). The third roll moving mechanism 26b on the other side moves the other end 13B of the third roll 13 to cancel the variation G2B based on the command of the third roll movement instructing section 374. [ In the second direction H23 (see Fig. 20).

The one-side third roll moving mechanism 26a has the same structure as the one-side first roll moving mechanism 25a described above. Therefore, when the first portion 26a1 is moved in the third roll axial direction HX13 (left-right direction in Fig. 20) similarly to the one-side first roll moving mechanism 25a described above, the first portion 26a1 The slope 26a4 of the second portion 26a2 moves in the second direction H23 (see FIG. 20) by moving the slope 26a3 of the second portion 26a2 in the third roll axial direction HX13 Thereby moving the one end portion 13A of the third roll 13 in the second direction H23 (vertical direction in Fig. 20).

The third roll moving mechanism 26b on the other side also has the same structure as the above-described first roll moving mechanism 25b on the other side. Therefore, when the first portion 26b1 is moved in the third roll axis direction HX13 (the left-right direction in Fig. 20) similarly to the above-described first-side first roll moving mechanism 25b, the first portion 26b1 The slope 26b4 of the second portion 26b2 moves in the second direction H23 (see FIG. 20) by moving the slope 26b3 of the second portion 26b2 in the third roll axial direction HX13 And the other end 13B of the third roll 13 moves in the second direction H23 (the up-and-down direction in Fig. 20).

In this manner, the one-end third roll moving mechanism 26a moves the one end portion 13A of the third roll 13 in the second direction H23 to cancel the variation amount? G2A (i.e.,? G2A , One end 13A of the third roll 13 is moved in the second direction H23). Further, the other end third roll moving mechanism 26b moves the other end portion 13B of the third roll 13 in the second direction H23 to cancel the variation amount? G2B (i.e., by? G2B) , And the other end 13B of the third roll 13 is moved in the second direction H23).

Accordingly, the gap dimension G2 of the second gap KG2 can be adjusted (reversed) to the second gap target value G2T. More specifically, the gap dimension G2A (see FIG. 20) of the one end KG2A of the second gap KG2 can be adjusted (reversed) to the one second gap target value G2TA. Further, the gap dimension G2B (see FIG. 20) of the other end KG2B of the second gap KG2 can be adjusted (reversed) to the second gap target value G2TB on the other side. The one-side second gap target value G2TA is equal to the gap dimension G2A of one end KG2A of the second gap KG2 measured at L31A and L41A at step T115. The second gap target value G2TB on the other side is the same as the gap dimension G2B of the other end KG2B of the second gap KG2 measured in L31B and L41B in step T115.

20, the rotary shaft portion 45 of the third roll 13 and the rotary shaft 47b of the motor 47 for rotating the third roll 13 are connected to the Schmidt coupling 46 Lt; / RTI &gt; The motor 47 is held and fixed by a bracket (not shown). With this structure, the third roll 13 (rotary shaft portion 45) can be moved in the second direction H23 (vertical direction in Fig. 20) independently of the motor 47 . Even when the third roll center shaft 13ax and the center of the rotational axis 47b of the motor 47 are shifted from each other due to the movement of the rotational axis portion 45 of the third roll 13, The third roll 13 can be rotated appropriately.

Then, the process proceeds to step T14 (adjustment process), and the adjustment unit 375 completes the movement of the first roll 11 by the first roll movement mechanism 25 as in step S14 of the embodiment, , And after the movement of the third roll 13 by the third roll moving mechanism 26 is completed, the second roll 1/4 rotation time TQ at which the second roll 12 rotates 1/4 has elapsed , And further determines whether or not the third roll 13 rotation time T? 3 has elapsed since the third roll 13 rotates by the third angle? 3. If it is determined that the third roll &amp;thetas; 3 rotation time T &amp;thetas; 3 has not elapsed (NO), the process of step T14 is repeated to wait for the elapse of time. On the other hand, if it is determined to be YES in step T14, the process proceeds to step T15, and the adjustment unit 375 applies the uncoated active material layer 6 to the current collecting foil 2 in the same manner as in step S15 of the embodiment Is terminated.

When the application is not completed (NO), the process returns to step T117 (see FIG. 17) to start the new detection period DT (n + 1). On the other hand, when the application is completed (YES), the step T1 (coating step) is completed and the flow returns to the main routine (see Fig. 2). Subsequently, in the drying step S2, the non-dried active material layer 6 is dried using the drying apparatus 30 to form the active material layer 3, and the material layer 3 Is wound around the electrode plate roll 1RL.

By doing so, the gap dimension G1 of the first gap KG1 and the gap dimension G2 of the second gap KG2 are kept almost constant over the entire period of the step T1 (coating step) It is possible to prevent the variation of the first gap KG1 and the variation of the second gap KG2 caused by the thermal expansion of the rolls 11 to 13 from accumulating.

Here, it will be described in detail with reference to Figs. 21 and 22. Fig. 21 is a graph showing a time variation of the gap dimension G1 of the first gap KG1. 22 is a graph showing the time variation of the gap dimension G2 of the second gap KG2. As shown in Figs. 21 and 22, after the supply of the active material paste 4 to the first gap KG1 is started, the detection period DT (1) is started from the time t1. Further, as shown in Fig. 21, the gap dimension G1 of the first gap KG1 at time t1 is the first gap target value G1T. As shown in Fig. 22, the gap dimension G2 of the second gap KG2 at time t1 is the second gap target value G2T.

After the detection period DT (1) is started, the first roll 11, the second roll 12, and the third roll 13 thermally expand due to friction with time. Therefore, as shown by the broken line in Fig. 21, the gap dimension G1 of the first gap KG1 gradually decreases with time. Further, as shown by the broken line in Fig. 22, the gap dimension G2 of the second gap KG2 also gradually decreases with time.

However, in the second modification, the variation amount? G1 of the gap dimension G1 of the first gap KG1 is calculated using the measured values of the first sensor 21 and the second sensor 22 as described above And is canceled every detection period DT (n). Specifically, after a predetermined time has elapsed from the time t1 and the detection period DT (1) has ended at the time t2, the variation amount? G1 is calculated and the first roll movement mechanism 25 is used , The first roll 11 is moved and the fluctuation of the gap dimension G1 of the first gap KG1 is canceled. That is, as shown by the solid line in Fig. 21, the gap dimension G1 is returned to the first gap target value G1T.

As described above, by using the measured values of the third sensor 23 and the fourth sensor 24, the variation amount? G2 of the gap dimension G2 of the second gap KG2 is detected in the detection period DT (n )). More specifically, after a predetermined time has elapsed from the time t1 and the detection period DT (1) has ended at the time t2, the variation amount? G2 is calculated and the third roll movement mechanism 26 is used The third roll 13 is moved to cancel the fluctuation of the gap dimension G2 of the second gap KG2. That is, as shown by the solid line in Fig. 22, the gap dimension G2 is returned to the second gap target value G2T.

Thereafter, at the time t3, the next new detection period DT (2) starts. Thereafter, the first roll 11 is moved so as to cancel the variation amount? G1 of the gap dimension G1 of the first gap KG1 every detection period DT (n). Thus, as shown by the solid line in Fig. 21, the gap dimension G1 of the first gap KG1 is maintained at a substantially constant value close to or equal to the first gap target value G1T at any time, Accumulation of the fluctuation of the first gap KG1 due to thermal expansion can be prevented. In this way, the thickness TH5 of the second roll top film 5 formed on the second roll 12 can be maintained at a substantially constant value.

Similarly, the third roll 13 is moved so as to cancel the variation amount? G2 of the gap dimension G2 of the second gap KG2 every detection period DT (n). 22, the gap dimension G2 of the second gap KG2 is maintained at a substantially constant value close to or equal to the second gap target value G2T at any time, as shown by the solid line in Fig. 22, Accumulation of the fluctuation of the second gap KG2 due to thermal expansion can be prevented. Thus, the thickness TH6 of the non-dried active material layer 6 formed on the current collector foil 2 can be maintained at a substantially constant value.

Subsequently, the process proceeds to Step T3 (see Fig. 2) to apply the non-dried active material layer 6 to the other surface (back surface) 2sb of the current collecting foil 2 to produce an un- dried electrode plate 7 . Concretely, as shown in Figs. 17 and 18, the processes of steps T31 to T35 are performed in the same manner as the processes of steps T11 to T15 which were performed first. In step T31 (detecting process), the processes in steps T311 to T323 are performed in the same manner as the processes in steps T111 to T123. Specifically, in step T322, the variation amount? G1 of the gap dimension G1 of the first gap KG1 is calculated using the relational expression of? G1 = (L12 - L22) - (L11 - L21) , So that the first roll 11 is moved so as to cancel the variation amount? G1. In step T323, the variation amount? G2 of the gap dimension G2 of the second gap KG2 is calculated using the relational expression of? G2 = (L42 - L32) - (L41 - L31) The third roll 13 is moved so as to cancel out the variation amount? G2.

Thereafter, in the drying step S4, the non-dried active material layer 6 is dried by using the drying apparatus 30 to form the electrode plate 1 as the electrode plate roll 1RL Wind it. Thus, the electrode plate 1 having the active material layers 3 and 3 on both surfaces 2sa and 2sb of the current collector foil 2 is completed.

According to the above-described embodiment or the manufacturing method of Modifications 1 and 2, the influence of the thermal expansion of the first roll 11 and the second roll 12 on the second gap KG2 It is possible to move the first roll 11 in order to offset the variation amount? G1 of the gap dimension G1 of the gap 1 and to properly maintain the gap dimension G1 of the first gap KG1. Then, the fluctuation of the thickness TH5 of the second roll top film 5 caused by the variation of the first gap KG1 is removed every detection period DT (n), and the gap of the first gap KG1 It is possible to prevent accumulation of variations in the dimension G1. In this way, the influence of the thermal expansion of the first roll 11 and the second roll 12 on the thickness TH6 and the density of the non-dried active material layer 6 formed on the current collecting foil 2 is suppressed Dried electrode plate 7 in which the variation in the thickness (TH6) of the non-dried active material layer 6 and the like is suppressed can be produced in the longitudinal direction EH of the current collector foil 2. Further, according to the application devices 10 and 110, the fluctuation of the thickness TH5 of the second roll top film 5 due to the thermal expansion of the first roll 11 and the second roll 12 can be suppressed, Dry active material layer 6 in which the variation in thickness TH6 or the like is suppressed with respect to the longitudinal direction EH of the current collector foil 2 can be applied on the current collector foil 2. [

According to the manufacturing method of the embodiment or the modified forms 1 and 2, the second gap 12 due to the thermal expansion of the second roll 12 and the third roll 13 can be formed without considering the influence on the first gap KG1, It is possible to move the third roll 13 in order to offset the variation amount? G2 of the gap dimension G2 of the gap KG2 and properly maintain the gap dimension G2 of the second gap KG2. The fluctuation of the thickness TH6 of the non-dried active material layer 6 caused by the variation of the second gap KG2 is removed every detection period DT (n), and the gap dimension of the second gap KG2 It is possible to prevent accumulation of fluctuations in the gap G2. Thus, the influence of the thermal expansion of the second roll 12 and the third roll 13 on the thickness TH6 of the non-dried active material layer 6 formed on the current collecting foil 2 is suppressed, The undried electrode plate 7 in which the variation of the thickness TH6 of the non-dried active material layer 6 is suppressed with respect to the longitudinal direction EH of the foil 2 can be produced. Further, according to the application devices 10 and 110, the fluctuation of the thickness TH6 due to the thermal expansion of the second roll 12 and the third roll 13 with respect to the longitudinal direction EH of the current collecting foil 2 Dried active material layer 6 can be applied on the current collecting foil 2.

While the present invention has been described based on the embodiments and the modifications 1 and 2, the present invention is not limited to the above-described embodiments and the like, but can be appropriately changed and applied within the scope not departing from the gist of the invention Needless to say, there is. For example, in the embodiment and Modifications 1 and 2, the first to fourth sensors 21 to 24 are disposed on one side of the second roll 12 or on the third roll 13, Two examples are shown. However, each of the first to fourth sensors 21 to 24 may be used to detect the center portion of the second roll 12 or the third roll 13, respectively. In the embodiments and the like, the electrode plate 1 is obtained by applying the non-dried active material layer 6 on the current collecting foil 2 and drying the electrode plate 1. However, the present invention is not limited to the production of the electrode plate, It can be applied to the production of a sheet having a paste layer applied thereon.

In the second modification, the fourth radial position PR2s of the radially outer surface 2sa of the current collecting foil 2 wound around the third roll 13 by the fourth sensor 24 (24a, 24b) (See Fig. 16). However, like the first modification, the winding shape of the current collecting foil 2 with respect to the third roll 13 is changed so that the fourth sensor 24 (24a, 24b) The fourth radial position PR13s of the third roll surface 13s may be detected (see Fig. 15). Even in such a case, the process of steps T11 to T15 (steps T31 to T35) is performed in the same manner as in the second modification, so that the gap dimension G1 of the first gap KG1 and the gap dimension G2 of the second gap KG2 The variation of the first gap KG1 and the variation of the second gap KG2 caused by the thermal expansion of the first to third rolls 11 to 13 are accumulated Can be prevented.

Claims (17)

1. A method of producing a sheet (1) having a paste layer formed by forming a strip-shaped paste layer made of paste on a strip-like base material sheet (2)
A first roll 11 and a second roll 11 disposed parallel to each other with a first clearance KG1 interposed therebetween and rotating in a second roll rotation direction opposite to the first roll 11 A second roll 12 and a second gap 12 disposed parallel to the second roll 12 via a second clearance KG2 and rotated in a direction opposite to the second roll 12, Wherein the first roll (11), the second roll (12), and the third roll (13) have a third roll (13) A first imaginary plane PL21 connecting the second roll center axis of the second roll 12 and the first roll center axis of the first roll 11 and a second imaginary plane PL21 connecting the second roll center axis of the second roll 12, The second virtual plane PL23 connecting the third roll center axis of the third roll 13 is perpendicular to the second roll center axis and the second virtual plane PL23 extends from the first gap KG1 to the second roll (12) on the second roll surface And the second gap (KG2) is formed at a position where the second roll (1) is rotated by 1/4 rotation in the second roll rotation direction, and the second gap (1) that is larger than 0 DEG and smaller than 90 DEG in the second roll rotation direction from the first gap (KG1) on the surface of the coating film of the upper coating film (upper coating film) A first sensor (21) for detecting a first radial position of the coating film surface of the second roll top coat at the first angular position (AG1), and a second sensor (21) for sandwiching the second roll 1 sensor 21 that is disposed at a second angular position (AG1) of the second roll 12, which is disposed opposite to the second roll 12, and which advances 180 degrees from the first angular position AG1 in the second roll rotational direction AG2) for detecting a second radial position of the second roll surface And a first roll moving mechanism (25) configured to move the first roll (11) in a first direction connecting the second roll (12) and the first roll (11) The paste is supplied to the first clearance KG1 and the second roll top coat applied to the second roll surface is passed through the second clearance KG2 so that the third roll 13 is transported To form a paste layer on the substrate sheet (2); and a step of forming the paste layer on the substrate sheet (2)
(11) and the second roll (12) from the first radial position detected by the first sensor (21) and the second radial position detected by the second sensor (22) Detecting the amount of variation of the gap dimension of the first gap KG1 during the detection period which is repeatedly formed due to the thermal expansion occurring in the first gap (KG1)
Moving the first roll (11) in the first direction so as to cancel the variation of the detected gap (KG1) using the first roll moving mechanism (25)
The movement of the first roll 11 is completed by the first roll moving mechanism 25 after the last sensing period has ended and then the second roll 12 is rotated at the first angle (1) after the elapse of the second roll rotation time for rotating the roller (1) by a predetermined amount. The method according to claim 1,
The variation amount of the first gap KG1 generated within the detection period due to the thermal expansion is detected by the first sensor 21 ) Of the second roll (12) detected by the second sensor (22) and the amount of change in the first radial position of the second roll surface detected by the second sensor From the difference in the amount of change in the radial position of the sheet (1). The method according to claim 1,
The first sensor 21 is configured to measure the difference between the first sensor 21 and the second sensor 21 in the first angular position AG1 measured by the first sensor 21 before the supply of the paste to the first gap KG1 is started. 2 is a sensor for detecting the first radial position of the coating film surface with the first radial position before start of the roll surface as the reference position,
The second sensor (22) is configured to measure the second gap (AG2) at the second angular position (AG2) measured by the second sensor (22) before the supply of the paste to the first gap 2 is a sensor for measuring the second radial position of the second roll surface with the second radial position before start of the roll surface as the reference position,
(Counting) from the time when supply of the paste is started to the first clearance (KG1) at the start of the first detection period of the repeatedly formed detection period, so that the second roll (12) Before the first roll 21 is rotated by one angle? 1 or before the second roll 12 is rotated by the first predetermined number, the first sensor 21 detects the first pre- Measuring an initial first radial position (L11) of the coating surface of the second roll top coat,
Wherein said second roll (12) is calculated at the start of the first detection period in the detection period which is repeatedly formed from when the supply of the paste is started to the first gap (KG1) before the second roll 12 rotates by the first predetermined number of revolutions after the rotation of the second roll 12 by the first sensor 22 or by the second sensor 22 before the rotation of the second roll 12 by the first predetermined number, , Measuring an initial second radial position (L21) of the second roll surface,
After the initial first radial position L11 and the initial second radial position L21 are measured and at the end of each of the detection periods, the first sensor 21 detects the initial first radial position L11 and the initial second radial position L21, Measuring a first radial position (L12) at the end of the coating surface of the second roll top coat with the radial position as a reference position,
After the initial first radial position L11 and the initial second radial position L21 are measured, at the end of each detection period, the second sensor 22 detects the initial second radial position L11 and the initial second radial position L21, Measuring a second radial position (L22) at the end of the second roll surface with the radial position as a reference position,
The value of ΔG1, which is the variation amount of the first gap (KG1) generated within each sensing period by the thermal expansion, is set to L11, the value of the initial second radial position is L21 (L12 - L22) - (L11 - L21), where L12 is a value at the first radial position at the end, and L22 is a value at the end at the second radial position at the end. (1) with a paste layer. 4. The method according to any one of claims 1 to 3,
The first sensor and the second sensor may include a first side first sensor and a first side second sensor arranged to face each other via a first end of the second roll (12) A second side first sensor and a second side second sensor disposed opposite to each other via a second end of the second roll (12)
The first roll moving mechanism (25) includes a first side first roll moving mechanism configured to move the first end of the first roll (11) in the first direction, And a second side first roll moving mechanism configured to move the second end of the first roll in the first direction,
When detecting the amount of variation of the gap dimension of the first gap KG1,
Side first sensor and the first-side second sensor, the amount of variation of the gap dimension of the first end of the first gap KG1 is detected,
Side first sensor and the second-side second sensor, the amount of variation of the gap dimension of the second end of the first gap KG1 is detected,
When the first roll 11 is moved in the first direction,
The first end of the first roll (11) is moved so as to offset the fluctuation amount of the gap dimension at the first end of the first gap (KG1) detected using the first side first roll moving mechanism And,
The second end of the first roll (11) is moved so as to offset the fluctuation amount of the gap dimension at the second end of the first gap (KG1) detected using the second side first roll moving mechanism (1), wherein the paste layer (1) is formed on the surface of the sheet (1). 4. The method according to any one of claims 1 to 3,
The coating device includes:
The surface of the layer of the paste layer transferred onto the substrate sheet 2 wound around the third roll 13 is peeled off from the second gap KG2 on the third roll surface of the third roll 13 (3) for detecting the third radial position of the layer surface of the paste layer in the third angular position (AG3) where the third angle (? 3) is larger than 0 and smaller than 90 degrees in the third roll rotation direction 3 sensor 23,
Wherein the third roll (13) is arranged to face the third sensor (23) with the third roll (13) sandwiched therebetween and the third roll (13) In the fourth angular position (AG4), which is 180 degrees from the third angular position (AG3) in the third roll rotation direction, out of the diameter outer surface of the sheet (2) A fourth sensor 24 for detecting a fourth radial direction position of the fourth sensor 24,
And a third roll moving mechanism (26) configured to move the third roll (13) in a second direction connecting the second roll (12) and the third roll,
(12) and the third roll (13) from the third radial position detected by the third sensor (23) and the fourth radial position detected by the fourth sensor (24) Detecting a variation amount of the gap dimension of the second gap KG2 generated during the detection period by the thermal expansion occurring in the detection period for each detection period,
Moving the third roll (13) in the second direction so as to cancel the variation amount of the second clearance (KG2) detected using the third roll moving mechanism (26)
The movement of the first roll 11 by the first roll moving mechanism 25 is completed after the last detection period is completed and the movement of the third roll moving mechanism 26 by the third roll moving mechanism 26 is completed, After the completion of the movement of the roll 13, the second roll 1/4 rotation time in which the second roll 12 rotates 1/4 elapses, and the third roll 13 rotates in the third angle? 3 ) After the rotation time of the third roll (13) that rotates by a predetermined number of revolutions per minute. 6. The method of claim 5,
The fluctuation amount of the second gap KG2 generated within the detection period by the thermal expansion of the second roll 12 and the third roll 13 when detecting the amount of variation of the gap dimension of the second gap KG2 Of the layer thickness of the paste layer detected by the third sensor (23) during the detection period and the amount of change in the third radial position of the layer surface of the paste layer detected by the fourth sensor (24) From the difference in the amount of variation of the surface or the fourth radial position of the outer surface of the diameter. 6. The method of claim 5,
The third sensor 23 is configured to measure the third gap 231 at the third angular position AG3 measured by the third sensor 23 before the supply of the paste to the first gap KG1 is started. 3 is a sensor for measuring the third radial position of the layer surface of the paste layer with the third radial position before the roll surface as the reference position,
The fourth sensor 24 may be configured to measure the second gap G2 at the fourth angular position AG4 measured by the fourth sensor 24 before the supply of the paste to the first gap KG1 is started. 3 is a sensor for measuring the radial outer surface of the base material sheet (2) or the fourth radial position of the third roll surface with the fourth radial position before start of the roll surface as a reference position,
Wherein the third roll (13) is calculated from the time when the second roll top film first reaches the second gap (KG2) at the beginning of the first detection period during the repeated detection period, and the third roll Before the third roll 13 is rotated a second predetermined number of times after the rotation of the third roll 13 by the angle? 3 or more, the third sensor 23, by the third sensor 23, , Measuring an initial third radial position (L31) of the layer surface of the paste layer,
Wherein the third roll (13) is calculated from the time when the second roll top film first reaches the second gap (KG2) at the beginning of the first detection period during the repeated detection period, and the third roll Before the third roll 13 is rotated a second predetermined number of times, the fourth sensor 24 rotates the fourth pre-start radial position to the reference position (L41) of the outer diameter surface of the base material sheet (2) or an initial fourth radial position of the third roll surface,
After the initial third radial position and the initial fourth radial position are measured, at the end of each detection period, the third sensor (23) sets the third radial position before the start to the reference position , Measuring a third radial position (L32) at the end of the layer surface of the paste layer,
After the initial third radial position and the initial fourth radial position are measured, at the end of each detection period, the fourth sensor (24) sets the fourth radial position before the start to the reference position , Measuring the fourth radial position (L42) at the end of the radially outer surface of the base sheet (2) or at the end of the third roll surface,
The value of? G2, which is the variation amount of the second gap KG2 generated within the sensing period by the thermal expansion, is set to L31, the value of the initial fourth radial position is L41 (L42 - L32) - (L41 - L31), where L32 is a value at the third radial position at the end, and L42 is a value at the fourth radial position at the end of the calculation. (1) with a paste layer. 6. The method of claim 5,
The plurality of third sensors and the fourth sensor may include a first side third sensor and a first side fourth sensor arranged to face each other via a first end of the third roll 13, Side third sensor and a second-side fourth sensor disposed opposite to each other via a second end of the second side-end sensor (13)
The third roll moving mechanism (26) includes a first side third roll moving mechanism configured to move the first end of the third roll (13) in the second direction, and a third side roll moving mechanism And a second side third roll moving mechanism configured to move the second end portion of the second roll moving mechanism in the second direction,
When detecting the amount of variation of the gap dimension of the second gap KG2,
A change amount of the gap dimension of the first end of the second gap KG2 is detected using the first side third sensor and the first side fourth sensor,
The amount of variation of the gap dimension of the second end of the second gap KG2 is detected using the second side third sensor and the second side fourth sensor,
When the third roll (13) is moved in the second direction,
The first end of the third roll (13) is moved by the first side third roll moving mechanism so as to offset the variation amount of the gap dimension of the first end of the second gap (KG2) And,
The second end of the third roll (13) is moved by the second side third roll moving mechanism so as to offset the variation amount of the gap dimension at the second end of the detected second gap (KG2) (1). &Lt; / RTI &gt; The method of claim 3,
Wherein the first predetermined number and the second predetermined number are 30, wherein the first predetermined number and the second predetermined number are 30. As a coating apparatus for forming a strip-shaped paste layer made of paste on a strip-like base material sheet 2,
A first roll 11,
A second roll 12 disposed parallel to the first roll 11 via a first clearance KG1 and rotating in a second roll rotation direction opposite to the first roll 11,
The second roller 12 is disposed in parallel with the second gap KG2 via the second gap 12 and rotates in a direction opposite to the second roll 12 and passes through the second gap KG2, The third roll 13 carrying the second roll 12 and the first roll 11, the second roll 12 and the third roll 13 are driven by the second roll 12, A first virtual plane PL21 connecting an axis of the third roll 13 and a first roll center axis of the first roll 11 and a second virtual plane PL21 connecting the second roll center axis of the second roll 12 and the third roll center axis of the third roll 13, A second imaginary plane PL23 connecting the roll center axes is arranged on the second roll surface of the second roll 12 from the first gap KG1 in a form orthogonal to the second roll center axis, And the second clearance KG2 is formed at a position where the second clearance KG2 has been formed by a quarter rotation in the second roll rotation direction,
The surface of the second roll from the first clearance KG1 to the surface of the second roll top coat made of the paste applied to the second roll surface is greater than 0 DEG and less than 90 DEG A first sensor (21) for detecting a first radial position of the coating film surface of the second roll top film at a first angular position (AG1) where a small first angle (? 1)
(AG1) from the second roll surface (12) of the second roll (12) so as to face the first sensor (21) with the second roll (12) A second sensor (22) for detecting a second radial position of the second roll surface at a second angular position (AG2) that has advanced 180 ° in the roll rotational direction,
A first roll moving mechanism (25) configured to move the first roll (11) in a first direction connecting the second roll (12) and the first roll (11)
The paste is supplied to the first clearance KG1 and the second roll top coat applied on the second roll surface is passed through the second gap KG2 to convey the third roll 13, Is transferred to the base sheet (2), and the thermal expansion occurring in the first roll (11) and the second roll (12) along with the continuous formation of the paste layer on the base sheet (2) The first radial position of the coating film surface of the second roll top film detected by the first sensor (21), and the second radial position of the coating film surface of the second roll top film detected by the first sensor , A first gap variation detecting unit configured to detect the second radial position of the second roll surface detected by the second sensor (22)
The movement of the first roll (11) in the first direction is adjusted so as to offset the variation amount of the first gap (KG1) detected by the first gap variation detection unit toward the first roll movement mechanism (25) A first roll movement instruction unit configured to perform an instruction,
The movement of the first roll 11 is completed by the first roll moving mechanism 25 after the last sensing period has ended and then the second roll 12 is rotated at the first angle and the control unit is configured to start the new detection period after the second roll rotation time that has elapsed since the second roll rotation time has elapsed. 11. The method of claim 10,
The first gap variation detection unit detects the variation amount of the first gap (KG1) generated within the detection period by the thermal expansion of the first roll (11) and the second roll (12) , The variation of the first radial position of the coating film surface of the second roll top film detected by the first sensor (21) and the variation of the first radial position of the second roll (12) detected by the second sensor From the difference in the amount of variation of the second radial position of the second roll surface. 11. The method of claim 10,
The first sensor 21 is configured to measure the difference between the first sensor 21 and the second sensor 21 in the first angular position AG1 measured by the first sensor 21 before the supply of the paste to the first gap KG1 is started. 2 is a sensor for detecting the first radial position of the coating film surface with the first radial position before start of the roll surface as the reference position,
The second sensor (22) is configured to measure the second gap (AG2) at the second angular position (AG2) measured by the second sensor (22) before the supply of the paste to the first gap 2 is a sensor for measuring the second radial position of the second roll surface with the second radial position before start of the roll surface as the reference position,
The first gap variation detection unit counts the time from when the supply of the paste is started to the first gap (KG1) at the start of the first detection period in the detection period which is repeatedly formed, Before the rotation of the second roll (12) by the first sensor (21) before the rotation of the first roll (12) by more than the first angle (? 1) The initial initial radial position (L11) of the coating film surface is measured with the radial position as a reference position, and the second sensor (22) measures the initial radial position Measuring an initial second radial position (L21) of the second roll surface to determine a value of the initial first radial position (L11) of the measured coating film surface and a value of the initial second radial position The value of the radial direction position L21 is acquired,
Thereafter, at the end of each of the detection periods, the first sensor (21) sets the first radial position (L12) at the end of the coating film surface with the first radial position as the reference position as the reference position And measuring the second radial position (L22) at the end of the second roll surface, with the second radial position before the start as the reference position, by the second sensor (22) The value of the first radial position L12 at the end of the surface and the value of the second radial position L22 at the end of the second roll surface are obtained,
The value of ΔG1, which is the variation amount of the first gap KG1 generated within the sensing period by the thermal expansion, is set to L11, the value of the initial second radial position is L21 (L12 - L22) - (L11 - L21), where L12 is a value at the first radial position at the end, and L22 is a value at the end at the second radial position at the end, Device. 13. The method according to any one of claims 10 to 12,
A plurality of the first sensors and the second sensor may include a first side first sensor and a first side second sensor disposed opposite to each other via a first end of the second roll 12, And a second side first sensor and a second side second sensor disposed opposite to each other via a second end of the second side plate (12)
The first roll moving mechanism (25) includes a first side first roll moving mechanism configured to move the first end of the first roll (11) in the first direction, And a second side first roll moving mechanism configured to move the second end of the first roll in the first direction,
The first gap variation detection unit detects the variation amount of the gap dimension at the first end of the first gap KG1 using the first sensor at the first side and the second sensor at the first side, The amount of variation of the gap dimension at the second end of the gap KG1 is detected using the second side first sensor and the second side second sensor,
The first roll movement instruction unit is configured to move the first roll (11) so as to offset the variation amount of the gap dimension at the first end of the first gap (KG1) detected toward the first side first roll movement mechanism To the second side first roll moving mechanism so as to cancel the variation amount of the gap dimension of the second end of the first gap (KG1) detected by the first side roll moving mechanism And instructs movement of the second end of the first roll (11). 13. The method according to any one of claims 10 to 12,
The surface of the layer of the paste layer transferred onto the substrate sheet 2 wound around the third roll 13 is peeled off from the second gap KG2 on the third roll surface of the third roll 13 (3) for detecting the third radial position of the layer surface of the paste layer in the third angular position (AG3) where the third angle (? 3) is larger than 0 and smaller than 90 degrees in the third roll rotation direction 3 sensor 23,
Wherein the third roll (13) is arranged to face the third sensor (23) with the third roll (13) sandwiched therebetween and the third roll (13) In the fourth angular position (AG4), which is 180 degrees from the third angular position (AG3) in the third roll rotation direction, out of the diameter outer surface of the sheet (2) A fourth sensor 24 for detecting a fourth radial direction position of the fourth sensor 24,
A third roll moving mechanism (26) configured to move the third roll (13) in a second direction connecting the second roll (12) and the third roll (13)
The amount of variation in the gap dimension of the second gap KG2 generated during the detection period is increased by the thermal expansion occurring in the second roll 12 and the third roll 13 to the third sensor 23 A second gap variation detecting unit for detecting the third radial direction position detected by the fourth sensor 24 and the fourth radial position detected by the fourth sensor 24,
The movement of the third roll (13) in the second direction is adjusted so as to cancel the variation of the second gap (KG2) detected by the second gap variation detection unit toward the third roll movement mechanism (26) Further comprising a third roll movement instruction unit for performing an instruction,
The adjustment unit may be configured such that the movement of the first roll 11 by the first roll movement mechanism 25 is completed after the last sensing period is ended and the movement of the first roll by the third roll movement mechanism 26 The third roll 13 is rotated by the third angle? 3 after the completion of the movement of the third roll 13 by the third roll 13, And the new detection period is started after the roll rotation time has elapsed. 15. The method of claim 14,
The second gap variation detecting unit may detect the variation amount of the second gap KG2 generated during the detection period by the thermal expansion of the second roll 12 and the third roll 13 in the detection period , The amount of change in the third radial position of the layer surface of the paste layer detected by the third sensor (23) and the amount of change in the third radial position detected on the third roll surface or the outer diameter surface From the difference in the amount of variation in the fourth radial position. 15. The method of claim 14,
The third sensor 23 is configured to measure the third gap 231 at the third angular position AG3 measured by the third sensor 23 before the supply of the paste to the first gap KG1 is started. 3 is a sensor for measuring the third radial position of the layer surface of the paste layer with the third radial position before the roll surface as the reference position,
The fourth sensor 24 may be configured to measure the second gap G2 at the fourth angular position AG4 measured by the fourth sensor 24 before the supply of the paste to the first gap KG1 is started. 3 is a sensor for measuring the radially outer surface of the base sheet 2 or the fourth radial position of the third roll surface with the fourth radial position before the start of the roll 13 as a reference position ,
The second gap variation detecting unit calculates the period from the time when the second roll top film first reaches the second gap KG2 at the start of the first detection period of the repeatedly formed detection period, Before the start of rotation by the third sensor 23 after the roll 13 has been rotated by the third angle? 3 or more and before the third roll 13 has rotated by the second predetermined number, The initial third radial position L31 of the layer surface of the paste layer is measured with the third radial position as the reference position and the fourth sensor 24 measures the initial radial position (L41) of the outer surface of the base sheet (2) or the surface of the third roll (L41) with the direction position as the reference position, The value of the initial third radial position L31, Get the value of the initial diameter of the fourth position (L41) of the radial outer surface or the third surface of the roll of the base sheet (2),
Thereafter, at the end of each detection period, the third sensor (23) detects the third radial position at the end of the layer surface of the paste layer with the third radial position as the reference position before the start Of the base sheet (2) is measured by the fourth sensor (24) and the fourth radial position of the base sheet (2) is measured by the fourth sensor (24) Measuring the fourth radial position L42 at the end of the base sheet 2 and measuring the value of the third radial position L32 at the end of the layer surface of the measured paste layer, Or the value of? G2, which is the variation amount of the second gap (KG2) generated within the detection period by the thermal expansion, of the third roll surface Initial third diameter direction L42 - L32 (L42 - L32) where L31 is the value of the initial radial position, L41 is the value of the initial fourth radial position, L32 is the value of the third radial position at the end, and L42 is the value of the fourth radial position at the end. ) - (L41 - L31). 15. The method of claim 14,
The plurality of third sensors and the fourth sensor may include a first side third sensor and a first side fourth sensor arranged to face each other via a first end of the third roll 13, Side third sensor and a second-side fourth sensor disposed opposite to each other via a second end of the second side-end sensor (13)
The third roll moving mechanism (26) includes a first side third roll moving mechanism configured to move the first end of the third roll (13) in the second direction, and a third side roll moving mechanism And a second side third roll moving mechanism configured to move the second end portion of the second roll moving mechanism in the second direction,
The second gap variation detection unit detects the variation amount of the gap dimension of the first end of the second gap KG2 using the first side third sensor and the first side fourth sensor, The amount of variation of the gap dimension at the second end of the gap KG2 is detected using the second side third sensor and the second side fourth sensor,
The third roll movement instruction unit is configured to move toward the first side third roll movement mechanism such that the third roll (13) is moved toward the first side third roll movement mechanism so as to offset the variation amount of the gap dimension at the first end, To the second side third roll moving mechanism so as to cancel the variation of the gap dimension of the second end of the second gap KG2 detected by the second side roll moving mechanism, And instructs movement of the second end of the third roll (13).

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