JP2012115789A - Intermittent coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a coating agent uniformly and properly to a required part of a substrate conveyed at a high speed.SOLUTION: In an intermittent coating apparatus for intermittently applying the coating agent to the substrate 1 by contacting coating rolls 10 and 11 to the substrate 1 conveyed along a conveyance path, there are provided the plurality of coating rolls 10, 11 arranged in certain intervals along the conveyance path of the substrate 1, and a driving mechanism for driving so as to coat different areas of the substrate with the coating agent respectively by attaching and detaching each coating roll 10 and 11 to and from the substrate 1 individually.

Description

  The present invention relates to an intermittent coating apparatus that intermittently applies a coating agent to the substrate by bringing a coating roll into intermittent contact with the substrate conveyed along a conveyance path.

  Conventionally, as shown in the following Patent Document 1, in an intermittent coating method in which a coating solution is intermittently applied to a belt-like support (base material) that is continuously conveyed, the application is performed by rotating the lower surface of the support and rotating the support. The coating portion coated with the coating liquid on the lower surface of the support is coated by relatively contacting and separating the peripheral surface of the coating cylinder (coating roll) that entrains the liquid from the coating liquid reservoir with a cam mechanism. An uncoated portion is formed.

  Moreover, as shown in the following Patent Document 2, the die disposed opposite to the coating surface of the medium (base material) has a coating liquid reservoir for supplying the coating liquid and a slit for discharging the coating liquid. By providing a plurality of coating means and sequentially driving the coating means, the coating liquid is intermittently applied onto the medium continuously supplied along the die, and the coating liquid having a constant width and a constant length is applied. An intermittent coating apparatus configured to form a work pattern is known.

JP 2009-90274 A Japanese Patent Laid-Open No. 10-43659

  In the intermittent coating apparatus disclosed in Patent Document 1, the lower surface of the base material and the peripheral surface of the coating roll are relatively contacted and separated by a cam mechanism, so that the base material is continuously conveyed. Since the coating liquid is applied intermittently at regular intervals, when the width dimension of the non-coated part formed between adjacent coating liquid layers is short, the coating roll is advanced and retracted at high speed. It is necessary to repeatedly contact with and separate from the base material by driving so as to cause the substrate to move. Therefore, unless the conveyance speed of the base material is suppressed to a certain value or less, the coating liquid cannot be properly applied to a necessary portion of the base material, and it is difficult to improve productivity. It was.

  On the other hand, as disclosed in Patent Document 2, the coating liquid is applied to the substrate by applying pressure to the coating liquid in the coating liquid reservoir so that the coating liquid is ejected from the slit and applied to the coating liquid at a predetermined timing. In the die coat coating method configured to intermittently apply the coating liquid by cutting off the applied pressure and stopping the discharge of the coating liquid, there is no need to move the die body having a predetermined weight. It is possible to apply the coating liquid to a necessary portion without reducing the conveyance speed.

  The die coating method is suitable for forming a relatively thick coating film having a thickness of 10 μm or more. In addition, the distance between the coating nozzle and the surface to be coated greatly affects the coating thickness. However, the above-mentioned die coat coating method is a coating agent having a film pressure of 10 μm or less on a surface to be coated having a three-dimensional pattern such as a porous protective film formed on a negative electrode plate for a battery. It is difficult to form a layer. For this reason, it is hoped that the coating solution can be uniformly and properly applied to the substrate while keeping the thickness of the coating agent layer formed by applying the coating solution to the substrate to a certain value or less. It was rare.

  The present invention has been made in view of the above-described problems, and provides an intermittent coating apparatus capable of coating a coating agent uniformly and appropriately on a necessary portion of a substrate conveyed at high speed. It is an object.

  The invention according to claim 1 is the intermittent coating apparatus that intermittently coats the base material with the coating roll by intermittently contacting the base material transported along the transport path. A plurality of coating rolls arranged at regular intervals along the conveyance path of the base material, and the coating agent is applied to different regions of the base material by bringing each coating roll into and out of the base material individually. And a drive mechanism that drives each of them to be applied.

  The invention according to claim 2 is configured such that in the intermittent coating apparatus according to claim 1, a plurality of coating rolls are alternately brought into contact with the base material in a preset order. .

  The invention according to claim 3 is the intermittent coating apparatus according to claim 1 or 2, further comprising two coating rolls, wherein the coating agent is intermittently applied to the substrate at an interval between both coating rolls. This is set to an even multiple of the value obtained by adding the interval of the non-coating region to the entire length of the coated region.

  According to a fourth aspect of the present invention, in the intermittent coating apparatus according to any one of the first to third aspects, the battery negative electrode plate made of a sheet-like current collector is installed on the surface of the substrate at regular intervals. Provided with detection means for detecting the start and end portions of the battery active material layer formed, and by setting the operation timing of the drive mechanism according to the detection signal of the detection means, a large number of coatings on the peripheral surface The surface of the active material layer for a battery is obtained by contacting the peripheral surface of the coating roll with the substrate while rotating the gravure coating roll on which the cell pattern is formed in the direction opposite to the conveyance direction of the substrate. The coating liquid is applied so as to cover the surface, and a porous protective film that covers the surface is formed.

  According to a fifth aspect of the present invention, in the intermittent coating apparatus according to any one of the first to fourth aspects, a coating agent reservoir comprising a space portion opened so as to face the peripheral surface of the coating roll is formed. A coating case, a coating agent feeding means for feeding the coating agent into a coating agent reservoir of the coating case, and an upstream side and a downstream side in the rotation direction of the coating roll. And a sealing member that seals the coating agent reservoir of the coating case, and is configured to contact and separate the coating roll from a base material supported by the guide roll and conveyed in the vertical direction. It is a thing.

  The invention according to claim 6 is the intermittent coating apparatus according to claim 1, wherein a plurality of coating rolls are simultaneously brought into contact with the substrate.

  The invention according to claim 7 is the intermittent coating apparatus according to claim 6, comprising two coating rolls, wherein the coating agent is intermittently applied to the substrate at an interval between both coating rolls. The total length of the coating area and the width dimension of the non-coating area formed between adjacent coating areas are set to an odd multiple of the value.

  The invention which concerns on Claim 8 is the intermittent coating apparatus of any one of the said Claims 1-5. WHEREIN: By disposing the installation position of a coating roll along the conveyance path of a base material, adjacent coating is carried out. A drive mechanism for adjusting the installation interval of the work rolls is provided.

  The invention which concerns on Claim 9 is an intermittent coating apparatus of any one of the said Claims 1-5, By displacing the installation position of the guide roll arrange | positioned along the conveyance path of a base material. A drive mechanism for adjusting the installation interval of the coating rolls is provided.

  In the invention which concerns on Claim 1, since it comprised so that a coating agent might each be applied to a different area | region of a base material with the some coating roll installed along the conveyance path of a base material, Conventionally configured to intermittently apply the coating agent to the base material at a fixed interval via a single coating roll even when the width dimension of the non-coated part formed between the coating regions is short It is not necessary to frequently repeat the operation of moving the coating roll to and away from the base material by displacing the coating roll at a high speed as in the coating apparatus of the above, while suppressing the moving speed of the coating roll to a predetermined value or less. There is an advantage that the coating agent can be appropriately applied to a necessary portion of the base material conveyed at a speed of 5 mm.

  In the invention which concerns on Claim 2, since it comprised so that a some coating roll might be made to contact with a base material alternately in the preset order, the tension | tensile_strength which arises when making a coating roll contact with a base material There is an advantage that the coating agent layer in which the coating agent is intermittently applied to the surface can be appropriately formed while suppressing the fluctuation.

  In the invention which concerns on Claim 3, the installation space | interval of two coating rolls is an even multiple of the value which added the space | interval of the non-coating area | region to the full length of the coating area | region where a coating agent is intermittently applied to a base material. Therefore, at the same time as contacting one of the two coating rolls to the base material, by separating the other of the two coating rolls from the base material, while effectively suppressing the tension fluctuation of the base material, There exists an advantage that the coating agent layer by which the coating agent was intermittently coated on the surface can be formed appropriately.

  In the invention which concerns on Claim 4, the detection means which detects the start part and termination | terminus part of the active material layer for batteries installed in the surface of the base material of the negative electrode plate for batteries which consists of a sheet-like collector at a fixed space | interval The gravure coating roll having a large number of coating cell patterns formed on the peripheral surface thereof is opposite to the substrate transport direction by setting the operation timing of the drive mechanism according to the detection signal of the detection means. The coating roll is applied so as to cover the surface of the active material layer for the battery by the so-called kiss reverse method by contacting the peripheral surface of the coating roll with the substrate while rotating in the direction. Therefore, a coating layer made of a thin porous protective film covering the surface of the battery active material layer can be appropriately formed. While intermittently conveying the substrate, the above intermittent coating The battery electrode plate having excellent functions by location can be manufactured at low cost. In addition, the thickness of the porous protective film can be set to 10 μm or less, and the coating agent can be applied to the surface of the substrate without frequently repeating the operation of moving the gravure coating roll having a predetermined weight at a high speed. The intermittently applied coating layer can be properly formed, and the operation timing of the drive mechanism is set according to the detection signal of the detection means, and the coating roll is brought into contact with the substrate intermittently. Even when the base material expands or contracts due to an environmental change such as a change in the outside air temperature or the transport speed of the base material fluctuates, The coating agent layer in which the coating agent is intermittently applied on the surface of the base material can be appropriately formed.

  In the invention according to claim 5, the coating agent is applied to the substrate conveyed in the vertical direction from the coating roll provided in the so-called sealed chamber type coating unit provided with the sealed coating case. When configured so that the coating agent is applied to the lower surface of the substrate conveyed in the horizontal direction by the coating roll provided in the coating unit in which the coating agent reservoir has been opened. As described above, there is an advantage that the coating agent can be appropriately applied to the substrate without causing the problem that the coating agent drips.

  In the invention according to claim 6, since the plurality of coating rolls are configured to contact the substrate at the same time, the plurality of coating rolls are simultaneously driven by the single drive mechanism to contact and separate from the substrate. There is an advantage that the structure of the intermittent coating apparatus can be effectively simplified.

  In the invention which concerns on Claim 7, the installation space | interval of two coating rolls is formed between the coating area which adjoins the full length of the coating area | region where a coating agent is intermittently applied to a base material, and a coating area. Since it was set to an odd multiple of the value obtained by adding the width dimension of the coating region, the coating agent was applied onto the substrate by simultaneously contacting the two coating rolls with the substrate, and then the coating was performed. There is an advantage that the coating agent can be intermittently and properly applied to the base material by repeating the operation of separating the two coating rolls from the base material at the same time.

  In the invention according to claim 8, since the installation position of one or both of the coating rolls is displaced along the conveyance path of the base material so as to adjust the installation interval of the adjacent coating rolls, Even when the total length of the coating area where the coating agent is intermittently applied to the surface of the material is increased or decreased, the installation interval of the coating roll is adjusted by a distance corresponding to the increase / decrease amount of the coating area. The interval can be maintained at a value corresponding to an even multiple of the added value. Accordingly, the coating agent layer can be appropriately formed by applying the coating agent intermittently on the surface of the substrate while effectively suppressing the tension fluctuation of the substrate with a simple configuration.

  In the invention according to claim 9, since it is configured to adjust the installation interval of the coating roll by displacing the installation position of the guide roll disposed along the conveyance path of the substrate, When the total length of the coating area on which the coating agent is intermittently applied increases or decreases, the distance between the coating area and the increase amount of the coating area is changed by displacing the installation position of the guide roll correspondingly. The installation interval of the coating rolls can be adjusted to maintain the installation interval at a value corresponding to an even multiple of the added value. Therefore, even when the total length of the coating region is changed, when the plurality of coating rolls are alternately moved to and away from the substrate without moving the coating unit or the like up and down, There is an advantage that the operation timing of the two coating rolls can be set so as to effectively suppress the occurrence of tension fluctuation.

It is sectional drawing which shows the principal part structure of the intermittent coating apparatus which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the whole structure of the said intermittent coating apparatus. It is explanatory drawing which shows the effect | action of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows the effect | action of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows the effect | action of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows 2nd Embodiment of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows 3rd Embodiment of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows 4th Embodiment of the intermittent coating apparatus which concerns on this invention. It is explanatory drawing which shows the effect | action of the said intermittent coating apparatus.

  1 and 2 show a first embodiment of an intermittent coating apparatus according to the present invention, which is applied to a base material 1 constituting a negative electrode plate for a battery such as a lithium ion secondary battery. The agent is applied intermittently. Specifically, a base material 1 in which a battery active material layer 3 having a thickness of about 80 μm is appropriately placed at predetermined intervals on a sheet-like current collector 2 made of a copper foil or the like having a thickness of about 10 μm. The surface of the battery active material layer 3 is made to have a film thickness of 10 μm or less, for example, 2 μm ± 1 μm, by intermittently applying and drying a coating agent made of ceramic paste on the surface of the battery active material layer at a predetermined speed. The thin-walled porous protective film 4 is formed so as to cover with a thickness of 5 mm.

  The intermittent coating apparatus includes first to third guide rolls 5 to 7 arranged at regular intervals so as to guide the substrate 1 along a conveyance path extending in the vertical direction, and a lower first guide roll 5. And the second coating roll disposed between the second guide roll 6 and the upper third guide roll 7. And a unit 9. The first coating unit 8 is provided with a first coating roll 10 for applying a coating agent on the surface of the substrate 1, and the second coating unit 9 is provided on the surface of the substrate 1. A second coating roll 11 for coating the coating agent is provided.

  On the upstream side (lower side) of the first coating unit 8 in the substrate transport direction, from the downstream end (hereinafter referred to as the start end) of the battery active material layer 3 formed on the surface of the current collector 2. The first detection comprising a reflective photoelectric sensor or the like for detecting the coating start position of the coating agent and the coating end position of the coating agent consisting of the upstream end portion (hereinafter referred to as the termination portion) of the battery active material layer 3 Means 12 are provided. In addition, a reflective photoelectric sensor that detects the start and end portions of the battery active material layer 3 formed on the surface of the current collector 2 also on the upstream side of the second coating units 8 and 9 in the substrate transport direction. Second detection means 13 including a sensor or the like is provided.

  The first and second coating units 8 and 9 have a coating case in which a coating agent reservoir 14 formed of a space portion opened so as to face the peripheral surfaces of the first and second coating rolls 10 and 11 is formed. 15, a doctor blade 16 made of steel, plastic or the like attached to the upper front end portion of the coating case 15, that is, the downstream side portion in the rotation direction of the coating rolls 10, 11, and the lower front end of the coating case 15 Part, that is, a seal plate 17 made of steel, plastic, or the like provided on the upstream side in the rotation direction of the coating rolls 10 and 11.

  The coating rolls 10 and 11 are formed of gravure coating rolls having a large number of coating cell patterns on the peripheral surface and an outer diameter of about 100 mm. Further, the coating roll 10 in a state where the coating agent fed into the coating agent reservoir 14 from the coating agent feeding means (not shown) is held in the coating cell pattern of the coating rolls 10 and 11. , 11 in accordance with the rotation of the blade, the excess coating agent adhering to the peripheral surface is scraped off by the doctor blade 16.

  And while the said coating rolls 10 and 11 are driven with the drive means outside a figure and rotated in the reverse direction to the conveyance direction of the base material 1, the surrounding surface of the said coating rolls 10 and 11 is the surface of the base material 1. The coating agent is configured to be applied by a so-called kiss-reverse method by contacting the substrate. That is, in this embodiment, as shown in FIG. 1 and FIG. 2, the coating rolls 10, 11 on the base material 1 transported upward from below by rotating the coating rolls 10, 11 counterclockwise. The thin and uniform coating is enabled by the kiss reverse method in which the coating agent on the coating rolls 10 and 11 is transferred onto the substrate 1 while moving the contact portion of 11 from the upper side to the lower side.

  The first and second coating units 8 and 9 are individually contacted and separated from the substrate 1 by driving the coating case 15 in the horizontal direction. A drive mechanism 18 is provided for driving the motor. The drive mechanism 18 is screwed into a guide member 19 that supports the coating case 15 so as to be horizontally movable, a nut plate 20 protruding from the coating case 15, and a screw hole formed in the nut plate 20. And a ball screw type (ball not shown) having a screw shaft 21 and a drive motor 22 that rotationally drives the screw shaft 21. Instead of the ball screw type drive mechanism 18, an air cylinder, a cam mechanism or a link mechanism type drive mechanism may be used.

  In the intermittent coating apparatus, a controller that sets the timing for operating the drive mechanism 18 of the first and second coating units 8 and 9 according to the output signals of the first and second detection means 12 and 13. 23 is provided. Then, as will be described later, the controller 23 outputs an operation command signal to the motor drivers 24 and 25 provided in the first and second coating units 8 and 9, respectively, at a predetermined timing. , And a control for rotating the drive motor 22 of the second coating unit 8 or 9 in the normal direction or the reverse direction.

  By rotating the drive motor 22 in the forward direction, the screw shaft 21 is rotationally driven in a direction in which the coating case 15 approaches the substrate 1 along the guide member 19, and the coating rolls 10 and 11 are moved to the substrate 1. It can be set as the coating state of the coating agent made to contact. Further, by rotating the drive motor 22 in the reverse direction, the screw shaft 21 is rotationally driven in a direction in which the coating case 15 is separated from the substrate 1, and the first and second coating rolls 10 and 11 are moved from the substrate 1. It can be set as the non-coating state of the separated coating agent. In this way, the coating agent adhering to the peripheral surfaces of the first and second coating rolls 10 and 11 is applied onto the battery active material layer 3 and the porous material covering the surface of the battery active material layer 3 is formed. The protective film 4 is formed intermittently.

  The installation interval K between the first coating roll 10 and the second coating roll 11 disposed adjacent to the conveyance path of the substrate 1 is such that the coating agent is intermittently applied to the substrate 1. It is set to a value corresponding to an even multiple of a value (L + N) obtained by adding the total length L of the applied areas and the interval N between the non-applied areas formed between adjacent application areas. For example, in the base material 1 in which the total length L of the coating region corresponding to the length of the battery active material layer 3 is set to 400 mm and the interval N of the non-coating regions is set to 20 mm, the first When the installation interval K between the second coating rolls 10 and 11 is set to be twice the addition value (L + N), the installation interval K between both coating rolls 10 and 11 is 840 mm.

  The installation interval K between the first coating roll 10 and the second coating roll 11 does not necessarily need to be set to a value corresponding to twice the addition value (L + N). If the installation interval K between the two coating rolls 10 and 11 is set to be approximately twice as large as (L + N), the coating rolls 10 and 11 are alternately brought into contact with the substrate 1 as will be described later. It is possible to appropriately form a coating agent layer (porous protective film 4) in which a coating agent is intermittently applied to the surface of the material 1 while suppressing fluctuations in tension generated in the material 1.

  In order to apply the coating agent on the surface of the base material 1 using the intermittent coating device, the current collector made of the base material 1 of the negative electrode plate for a battery manufactured in advance in a manufacturing device (not shown), that is, a copper foil or the like. A sheet-like body formed by properly forming a battery active material layer 3 having a predetermined thickness on the surface of the body 2 at a predetermined interval is placed on a conveyance path in which the first to third guide rolls 5 to 7 are installed. The first and second detection means 12 and 13 detect the start end and the end of the battery active material layer 3 corresponding to the coating start position and the coating end position of the coating agent while being transported at a constant speed. To do.

  As shown in FIG. 3, when the battery active material layer 3 that first reaches the installation portion of the first detection means 12 is the first battery active material layer 3 a, the start end of the battery active material layer 3 is the first detection means 12. The first battery is detected based on the distance from the installation part of the first detection means 12 to the installation part of the first coating roll 10 and the conveyance speed of the base material 1 when it is detected that the installation part has been reached. The controller 23 calculates the time until the starting end portion of the active material layer 3a reaches the installation portion of the first coating roll 10.

  And as shown with the virtual line of FIG. 3, just before the start end part of the active material layer 3a for 1st batteries arrives at the installation part of the 1st coating roll 10, this 1st coating roll 10 is made into the base material 1. The operation timing for normal rotation of the drive motor 22 of the first coating unit 8 is set according to the calculated value of the time so that the coating of the coating agent is started in contact with Further, it is detected that the terminal portion of the first battery active material layer 3 a has reached the installation portion of the first detection means 12, and the first battery according to the detection signal output from the first detection means 12. Immediately after the terminal portion of the active material layer 3a reaches the installation portion of the first coating roll 10, the first coating roll 10 is separated from the base material 1 to finish coating the coating agent. The operation timing for reversing the drive motor 22 is set.

  After separating the first coating roll 10 from the base material 1 as described above, the second battery active material layer 3b located at the downstream portion of the first battery active material layer 3a is When it is detected that the installation part has been reached, the first coating is performed until the second battery active material layer 3b passes through the installation part of the first coating roll 10, as shown in FIG. The drive motor 22 of the unit 8 is maintained in an inoperative state. Thereby, the said 1st coating roll 10 is hold | maintained at the non-coating state of the coating agent spaced apart from the base material 1, and the said 2nd battery active material layer 3b passes along the installation part of the 1st coating roll 10. It will be. Then, the first battery active material layer 3c located downstream of the second battery active material layer 3b reaches the first detection means 12 and is detected in response to a detection signal output from the first battery. The operation timing of the drive motor 22 is set so that the first coating roll 10 is brought into and out of contact with the substrate 1 at the same timing as the battery active material layer 3a.

  When it is detected that the first battery active material layer 3a applied with the coating agent by the first coating unit 8 has reached the installation portion of the second detection means 13, FIG. As shown by the phantom line, the drive motor 22 of the second coating unit 9 is maintained in the non-operating state until the active material layer 3a for the first battery passes the installation portion of the second coating roll 11. Then, the second coating roll 11 is brought into the non-coating state of the coating agent separated from the substrate 1, and the first battery active material layer 3 a is passed through the installation portion of the second coating roll 11.

  Then, when it is detected that the starting end portion of the second battery active material layer 3b that has not been applied with the coating agent in the first coating unit 8 has reached the installation portion of the second detection means 13, As shown in FIG. 5, the second coating roll 11 is brought into contact with the substrate 1 immediately before the start end of the second battery active material layer 3 b reaches the installation portion of the second coating roll 11. Application of the coating agent is started, and immediately after the terminal portion of the second battery active material layer 3b reaches the installation portion of the second coating roll 11, the second coating roll 11 is attached to the base material 1. The operation timing of the drive motor 22 is set so as to finish the application of the coating agent separated from the drive motor 22. Moreover, if the installation distance of the 1st coating unit 8 and the 2nd coating unit 9 is set to the double of the said addition value (L + N), the 1st coating unit 8 and the 2nd coating unit 9 and Since the operation timings of the drive mechanism 18 provided in the above can be matched, the second detection means 13 can be omitted.

  When the drive motor 22 is rotated forward to bring the coating rolls 10 and 11 into contact with the substrate 1, if the moving speed is too fast, the coating rolls 10 and 11 are pressed against the substrate 1 with a strong force. Since the apparatus vibrates and the vibration is transmitted to the base material 1, the moving speed of the coating rolls 10 and 11 is reduced by the absorber means before the coating rolls 10 and 11 come into contact with the base material 1. Is preferred. Then, considering the separation distance between the coating rolls 10 and 11 in the standby position and the base material 1 and the deceleration of the moving speed of the coating rolls 10 and 11 by the absorber means, the battery active material layer 3 described above. The operation timing is set so that the operation of the drive motor 22 is started at a predetermined time before the coating start end composed of the downstream end of the roller reaches the installation portion of the coating rolls 10 and 11. Thus, the coating of the coating agent can be started when the downstream end of the battery active material layer 3 reaches the installation portion of the coating rolls 10 and 11.

  On the other hand, when the driving rolls 22 of the first and second coating units 8 and 9 are reversed to separate the coating rolls 10 and 11 from the substrate 1, the moving speed of the coating rolls 10 and 11 is reduced. Even if the speed is increased, the vibration is not transmitted to the substrate 1, and the coating rolls 10 and 11 can be moved as fast as possible. In addition, the drive motor 22 is operated so that the application terminal portion formed by the upstream end portion of the battery active material layer 3 reaches the installation portion of the coating rolls 10 and 11 substantially at the same time. By setting the operation timing, it is possible to properly finish the coating of the coating agent.

  In the intermittent coating apparatus that intermittently coats the base material 1 by bringing the coating rolls 10 and 11 into intermittent contact with the base material 1 transported along the transport path as described above, A plurality of coating rolls 10, 11 are arranged at regular intervals along the conveyance path of the substrate 1, and the coating rolls 10, 11 are individually brought into contact with and separated from the substrate 1. Since the drive mechanism 18 that drives the coating agent to be applied to different areas of the material 1 is provided, even when the substrate 1 is conveyed at high speed, the coating agent can be uniformly and properly applied to the necessary portions. There is an advantage.

  That is, in the first embodiment, the first and second coating rolls 10 and 11 made of gravure coating rolls are configured to apply the coating agent on the surface of the substrate 1 by the kiss reverse method. The coating unit 8 and the second coating unit 9 are arranged at a predetermined interval in the conveyance path of the substrate 1, and the coating cases 15 of the first and second coating units 8 and 9 are respectively set at predetermined timings. Since the first and second coating rolls 10 and 11 are individually brought into and out of contact with the substrate 1 by being driven in the horizontal direction, the first and second coating rolls 10 and 11 By alternately bringing the coating material into contact with the substrate 1 and intermittently applying the coating agent on the surface of the substrate 1, a thin coating agent layer can be appropriately formed.

  Accordingly, even when the interval N between the non-coating portions formed between the coating regions of the adjacent coating agents is short, the coating agent is fixed on the substrate continuously conveyed by a single coating roll. Unlike the conventional coating apparatus configured to intermittently coat at intervals, it is not necessary to frequently repeat the operation of contacting and separating the base material by displacing the coating roll at a high speed. There is an advantage that the coating agent can be properly applied to the necessary portion of the base material 1 conveyed at a predetermined speed while suppressing the moving speed of the two coating rolls 10 and 11 to a certain value or less.

For example, when the moving speed V of the first and second coating rolls 10 and 11 having a predetermined mass M is set to ½ of the moving speed in a conventional apparatus using a single gravure coating roll. Can reduce the kinetic energy (= 1/2 MV ² ) generated when the first and second coating rolls 10 and 11 are moved to ¼ that of the conventional apparatus. For this reason, various adverse effects caused by moving the first and second coating rolls 10 and 11 at a high speed, for example, the coating position of the coating agent is shifted, or the coating layer thickness is not uniform. Current collector of the negative electrode plate for a battery by the kiss reverse method using the first and second coating rolls 10 and 11 made of the gravure coating roll while preventing the occurrence of harmful effects such as A thin porous protective film having a thickness of 10 μm or less, for example, 2 μm ± 1 μm, by uniformly coating the coating agent so as to cover the surface of the battery active material layer 3 formed on 2 The coating agent layer which consists of 4 can be formed appropriately. Accordingly, there is an advantage that a battery electrode plate having an excellent function can be manufactured at low cost by appropriately applying the coating agent by the intermittent coating apparatus while transporting the base material 1 of the battery negative plate at high speed. is there.

  Moreover, when comprised so that the 1st, 2nd coating rolls 10 and 11 may be made to contact / separate separately with respect to the base material 1 as mentioned above, it is continuously conveyed with a single coating roll. Compared to the conventional coating apparatus configured to intermittently apply the coating agent to the base material at regular intervals, the base material 1 is conveyed at a high speed, and the coating agent is appropriately applied to the necessary portions. Therefore, the interval N between the non-coated parts can be shortened as necessary. In addition, by shortening the interval N between the non-coating portions, the period during which the first and second coating rolls 10 and 11 are simultaneously separated from the base material 1 can be shortened. There is an advantage that it is possible to effectively prevent significant tension fluctuations in the material 1.

  In the first embodiment, the first and second detection means 12 for detecting the start end position and the end position of the coating material layer formed by intermittently coating the base material 1 with the coating agent. 13 and setting the operation timing of the drive mechanism 18 provided in the first and second coating units 8 and 9 according to the detection signals of the detection means 12 and 13, the first and second Although the example which comprised so that the coating rolls 10 and 11 were each made to contact with the base material 1 intermittently was demonstrated, it replaced with this structure, for example, the position of the registration mark which shows the reference position provided in the base material 1 It is also possible to set the operation timing of the drive mechanism 18 based on the data on the start and end positions of the coating material layer input to the controller 23 in advance, the conveyance speed of the substrate 1, and the like.

  However, as shown in the first embodiment, the operation timing of the drive mechanism 18 provided in the first and second coating units 8 and 9 is set according to the detection signals of the detection means 12 and 13. In such a case, even when the base material 1 expands or contracts due to an environmental change such as a change in the outside air temperature or the transport speed of the base material 1 fluctuates, the operation of each drive mechanism 18 is performed. There is an advantage that the timing can be set appropriately and the first and second coating rolls 10 and 11 can be brought into contact with and separated from the substrate 1 at an appropriate timing.

  For example, in the first embodiment, the battery active material is applied by coating the coating liquid so as to cover the surface of the battery active material layer 3 formed at regular intervals on the substrate 1 of the battery negative electrode plate. In the intermittent coating apparatus configured to form the porous protective film 4 that covers the surface of the layer 3, the start position and the end position of the coating agent layer composed of the start end and the end of the battery active material layer 3 Since the operation timing of the driving mechanism 18 provided in the first and second coating units 8 and 9 is set according to the detection signals of the first and second detection means 12 and 13 for detecting the The coating agent layer which consists of the thin porous protective film 4 etc. which coat | cover the surface of the battery active material layer 3 etc. can be formed appropriately.

  In addition, the coating agent reservoir 14 of the coating case 15 is sealed and applied to the base material 1 conveyed in the vertical direction from the coating rolls 10 and 11 provided in the so-called sealed chamber type coating units 8 and 9. Instead of the above-described embodiment configured to coat the coating agent, the lower surface of the substrate conveyed in the horizontal direction by the coating roll provided in the coating unit in which the coating agent reservoir is opened It is also possible to configure so that the coating agent is applied to the surface.

  However, in the case of a coating unit in which the coating agent reservoir is in an open state, there is a problem that the coating agent applied to the base material is liable to dripping. On the other hand, as shown in the above embodiment, the coating agent is applied to the substrate 1 conveyed in the vertical direction from the coating rolls 10 and 11 provided in the closed chamber type coating units 8 and 9. When configured to work, there is an advantage that the coating agent can be appropriately applied to the base material 1 without causing the liquid dripping.

  Moreover, in the said 1st Embodiment, the installation space | interval K of the 1st, 2nd coating rolls 10 and 11 is adjacent to the full length L of the coating area | region where a coating agent is intermittently applied to the base material 1. FIG. Since the distance N between the non-coating regions formed between the coating regions is set to a value that substantially corresponds to an even multiple of the added value (L + N), the first and second coating rolls 10 and 11 are alternated. The coating agent layer (porous protective film 4), in which the coating agent is intermittently applied to the surface of the base material 1 while suppressing the fluctuation in the tension of the base material 1 by moving to the base material 1 There is an advantage that it can be formed.

  As shown in the first embodiment, when the installation interval K of the first and second coating rolls 10 and 11 is set to twice the addition value (L + N), as shown in FIG. The second battery active material immediately after the terminal portion of the third battery active material layer 3c passes through the installation portion of the first coating roll 10 and the first coating roll 10 is separated from the substrate 1. The starting end portion of the layer 3b reaches the installation portion of the second coating roll 11, and control for bringing the second coating roll 11 into contact with the substrate 1 is executed. For this reason, the tension | tensile_strength of the base material 1 which arises by making the said 2nd coating roll 11 contact the base material 1 for the tension | tensile_strength fall of the base material 1 which arises by separating the said 1st coating roll 10 from the base material 1 is demonstrated. Can be killed as it rises. Therefore, the coating agent layer can be appropriately formed by applying the coating agent intermittently on the surface of the substrate 1 while effectively suppressing fluctuations in the tension of the substrate 1.

  As shown in FIG. 5, at the time immediately after the terminal portion of the third battery active material layer 3 c passes through the installation portion of the first coating roll 10, the start end portion of the second battery active material layer 3 b is still present. Has not reached the installation portion of the first coating roll 10, the starting end portion of the second battery active material layer 3 b reaches the installation portion of the first coating roll 10 from that time point, and the first coating roll 10 Until the roll 10 is brought into contact with the substrate 1, both the first and second coating rolls 10 and 11 are in a separated state. However, since the period is very short, there is no large tension fluctuation in the base material 1 during that period, and the installation interval K of the first and second coating rolls 10 and 11 is an even number of the addition value (L + N). By setting the value substantially corresponding to double, it is possible to effectively suppress the tension fluctuation of the substrate 1.

  FIG. 6 shows a second embodiment of the intermittent coating apparatus according to the present invention. The intermittent coating apparatus moves the first coating unit 8 up and down and displaces the installation position of the first coating roll 10 along the conveyance path of the base material 1, thereby causing the first and second adjacent to each other. A drive mechanism 26 that adjusts the installation interval K of the coating rolls 10 and 11 is provided. According to the intermittent coating apparatus according to the second embodiment, the type of the base material 1 supplied to the intermittent coating apparatus changes, and for example, the coating agent is intermittently applied to the surface of the base material 1. When the overall length L of the coating area increases, the first coating unit 8 is lowered by a distance corresponding to the increase amount, thereby setting the installation interval K of the first and second coating rolls 10 and 11. , The value corresponding to an even multiple of the added value (L + N) can be maintained.

  According to the intermittent coating apparatus according to the second embodiment, the first coating unit 8 is moved up and down so that the installation position of the first coating roll 10 is displaced along the conveyance path of the substrate 1. By the operation, the installation interval K between the first and second coating rolls 10 and 11 adjacent to each other can be arbitrarily adjusted. Therefore, even when the total length L of the coating region where the coating agent is intermittently applied to the surface of the base material 1 is changed, the first and second coating rolls 10 and 11 are alternately moved. When the base material 1 is brought into contact with and separated from the base material 1, it is possible to appropriately form a coating agent layer in which the coating agent is intermittently applied on the surface while effectively suppressing the tension fluctuation of the base material 1. There are advantages.

  The first and second coating rolls 10 adjacent to each other by moving the first coating unit 8 up and down and displacing the installation position of the first coating roll 10 along the conveyance path of the substrate 1. In place of the above-described configuration in which the installation interval K of 11 is adjusted, both the first and second coating units 8 and 9 are moved up and down to change the installation positions of the first and second coating rolls 10 and 11, respectively. Needless to say, the same effect can be obtained even when the substrate 1 is displaced along the conveyance path.

  Moreover, while installing the 1st coating roll 10 and the 2nd coating roll 11 facing each other like 3rd Embodiment shown in FIG. 7, of this 1st, 2nd coating roll 10,11. The first and second intermediate guide rolls 31 and 32 are installed at regular intervals below, and a drive mechanism for moving up or down one or both of the first and second intermediate guide rolls 31 and 32 is provided. You may comprise so that the installation space | interval of the 1st, 2nd coating rolls 10 and 11 may be adjusted. For example, when the total length L of the coating region where the coating agent is intermittently applied to the surface of the substrate 1 is increased, one or both of the first and second intermediate guide rolls 31 are moved by the drive mechanism. By lowering, the installation interval of the first and second coating rolls 10 and 11 is adjusted by a distance corresponding to the increase amount of the coating region, and the installation interval corresponds to an even multiple of the addition value (L + N). Can be maintained at the value you want.

  Therefore, according to the intermittent coating apparatus according to the third embodiment, when the overall length L of the coating region on the surface of the substrate 1 is changed without moving the first coating unit 8 and the like up and down, Corresponding to this, since the installation interval of the first and second coating rolls 10 and 11 adjacent to each other can be adjusted, the first and second coating rolls 10 and 11 are alternately moved to form a base material. In order to properly form a coating agent layer in which a coating agent is intermittently applied to the surface of the substrate 1 while effectively suppressing the occurrence of fluctuations in the tension of the substrate 1 when contacting and separating from the substrate 1, The operation timing of both coating rolls 10 and 11 can be set.

  In each of the above-described embodiments, the example in which the two coating rolls 10 and 11 including the first and second coating rolls 10 and 11 are installed in the conveyance path of the base material 1 has been described. It is good also as a structure which has arrange | positioned the 3 or more coating roll in the conveyance path of the base material 1. FIG. Further, the plurality of coating rolls arranged in the conveyance path of the substrate 1 do not necessarily need to be configured to contact the substrate alternately in a preset order. You may comprise so that a work roll may be made to contact with respect to the base material 1 simultaneously.

  That is, in the fourth embodiment of the intermittent coating apparatus according to the present invention, as shown in FIG. 8, two coating rolls 10 and 11 are disposed along the conveyance path of the substrate 1, and both coatings are performed. The installation interval K of the rolls 10 and 11 is set to an odd multiple of, for example, 1 times the value obtained by adding the interval N of the non-coating region to the total length L of the coating region to which the coating agent of the base material 1 is applied. ing. And according to the output signal of the detection means which abbreviate | omitted illustration, the starting end part of the 1st, 2nd battery active material layer 3a, 3b provided on the base material 1 becomes the installation part of both coating rolls 10,11. Immediately before reaching, the coating rolls 10 and 11 are simultaneously driven to come into contact with the base material 1 to thereby apply the coating agent to the first and second battery active material layers 3a and 3b. Immediately after the terminal portions of the first and second battery active material layers 3a and 3b pass through the installation portions of both coating rolls 10 and 11, as shown in FIG. The coating agent is intermittently applied to the substrate 1 by repeating the operation of separating from the substrate 1.

  Even in the case where the plurality of coating rolls 10 and 11 are simultaneously brought into contact with and separated from the base material 1 as described above, the coating agent is applied to the base material continuously conveyed by the single coating roll. It is not necessary to dispose the coating roll at high speed and repeatedly contact and separate from the substrate as in the conventional coating apparatus configured to intermittently coat the coating roll at a constant interval. 10 and 11 are brought into contact with the base material 1 for a certain period of time, and then the coating agent is intermittently applied to the base material 1 by maintaining it in a state of being separated from the base material 1 for the same amount of time. Can do. Therefore, it is possible to appropriately apply the coating agent to a necessary portion of the base material 1 that is transported at a predetermined speed while suppressing the moving speed of the coating rolls 10 and 11 to a certain value or less. In addition, since both the coating rolls 10 and 11 can be driven by a single drive mechanism and can be brought into and out of contact with the substrate 1 at the same time, the structure of the intermittent coating apparatus is effectively simplified. There is an advantage that can be made.

  In addition, when comprised so that both the coating rolls 10 and 11 may contact the base material 1 simultaneously like the said 4th Embodiment, the state which made the both coating rolls 10 and 11 contact the base material 1, and The tension generated in the base material 1 tends to fluctuate significantly in the state of being separated from the base material 1. For this reason, in order to prevent the fluctuation | variation of the tension | tensile_strength of the base material 1 produced when making the said coating rolls 10 and 11 contact / separate with respect to the base material 1, the said tension roll (not shown) is provided and the base material 1 is provided. It is preferable that the tension is adjusted.

DESCRIPTION OF SYMBOLS 1 Base material 2 Current collector 3 Battery active material layer 4 Porous protective film 10 1st coating roll 11 2nd coating roll 12, 13 Detection means 18 Drive mechanism 31, 32 Guide roll

Claims (9)

  In an intermittent coating apparatus that intermittently coats the base material with a coating roll by intermittently contacting the base material transported along the transport path, along the transport path of the base material A plurality of coating rolls arranged at regular intervals, and each coating roll is driven to be separately applied to and separated from the base material to apply the coating agent to different regions of the base material. An intermittent coating apparatus comprising a drive mechanism.   The intermittent coating apparatus according to claim 1, wherein a plurality of coating rolls are alternately brought into contact with a base material in a preset order.   Two coating rolls are provided, and the installation interval between both coating rolls is an even multiple of the total length of the coating area where the coating agent is intermittently applied to the substrate plus the spacing of the non-coating area. The intermittent coating apparatus according to claim 1, wherein the intermittent coating apparatus is set.   A detecting means for detecting a start end and a terminal end of a battery active material layer disposed at regular intervals on a surface of a base material of a battery negative electrode plate made of a sheet-like current collector, and a detection signal of the detection means Accordingly, by setting the operation timing of the drive mechanism according to the above, the gravure coating roll having a large number of coating cell patterns formed on the peripheral surface is rotated in the direction opposite to the conveying direction of the base material, and the coating mechanism is rotated. That the peripheral surface of the work roll is brought into contact with the base material to apply the coating liquid so as to cover the surface of the active material layer for the battery and form a porous protective film covering the surface The intermittent coating apparatus according to any one of claims 1 to 3.   A coating case in which a coating agent reservoir composed of a space portion opened so as to face the peripheral surface of the coating roll is formed, and a coating for feeding the coating agent into the coating agent reservoir of the coating case And a seal member that seals the upstream and downstream portions in the rotational direction of the coating roll to seal the coating agent reservoir in the coating case, and is supported by the guide roll The intermittent coating apparatus according to any one of claims 1 to 4, wherein the coating roll is configured to be brought into contact with and separated from a base material that is transported in a vertical direction. (Intermittent coating 1 is also common)   The intermittent coating apparatus according to claim 1, wherein a plurality of coating rolls are configured to contact the substrate at the same time.   With two coating rolls, the installation interval of both coating rolls is an odd multiple of the total length of the coating area where the coating agent is intermittently applied to the substrate plus the spacing of the non-coating area The intermittent coating apparatus according to claim 6, which is set.   6. A drive mechanism that adjusts the installation interval of adjacent coating rolls by displacing the installation position of the coating rolls along the conveyance path of the base material. The intermittent coating apparatus according to item.   The driving mechanism for adjusting the installation interval of the coating rolls by displacing the installation position of the guide rolls arranged along the conveyance path of the substrate is provided. 2. The intermittent coating apparatus according to item 1.

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