JP6477236B2 - Coating apparatus and coating method - Google Patents

Description

  The present invention relates to a coating apparatus and a coating method.

  As a conventional coating apparatus, there exists a coating apparatus of patent document 1, for example. This coating apparatus is configured as an apparatus that intermittently coats a sheet-like base material conveyed by a roller by discharging a slurry-like paint from a die head. Further, in this coating apparatus, the actual shape of the coated material coated on the base material is sequentially stored, and the coating material discharged from the die head is discharged based on the deviation between the preset target shape and the actual shape. The amount is controlled.

JP 2011-88138 A JP 2010-86811 A

  The above-described conventional coating apparatus controls the shape of the coating start end and the shape of the coating end end (both end shapes in the transport direction of the base material) in the coated product to be the target shape. On the other hand, as an abnormality in the shape of the coated product, an end height at which both ends in the width direction of the substrate are increased, or a sagging (end height in the minus direction) at which both ends in the width direction of the substrate are decreased is known. However, in the said patent document 1, it does not touch about the both-ends shape of the width direction of a coated material.

  In such a coating apparatus, the initial value of the coating condition at the start of coating deviates from a preset target value due to, for example, environmental factors such as equipment stop / recovery and lot switching of paint, etc. In this case, an abnormality in the shape of both ends in the width direction such as the end height is likely to occur. It is difficult to solve this abnormality in the shape of both ends in the width direction only by controlling the discharge amount of the paint. The abnormality in the shape of the coating start end or the coating end end, which is a problem of Patent Document 1, is, in other words, an abnormality in the basis weight in the vicinity of the coating start end or the coating end end. Correction is possible. However, if, for example, the weight per unit area of the coated product is appropriate and the end height is generated at both ends in the width direction, changing the paint discharge amount to correct the end height will result in the vicinity of the center in the width direction. It is conceivable that the basis weight of deviates from the optimum value.

  On the other hand, in the coating apparatus described in Patent Document 2, a die head has been proposed in which the shape of the slit for discharging the coating material is devised to suppress the end height at both ends in the width direction. However, with the method of Patent Document 2, it is difficult to cope with sagging at both ends in the width direction. Therefore, in the past, once the end heights at both ends in the width direction once occurred, trials were made while gradually changing a plurality of coating conditions such as the coating discharge amount, coating gap, and coating viscosity (solvent ratio). It was necessary to obtain coating conditions that would make the shape of the coated product appropriate. Therefore, in order to improve the yield of the coated product, it is necessary to quickly optimize the coating conditions.

  The present invention has been made in order to solve the above-mentioned problems, and has a coating apparatus and a coating method capable of quickly optimizing the coating conditions in order to make the shape of both ends in the width direction of the coated material appropriate. The purpose is to provide.

  In order to solve the above problems, a coating apparatus according to one aspect of the present invention includes a transport unit that transports a sheet-like base material in a longitudinal direction, and a slurry-like paint toward the base material that is transported by the transport unit. Based on the coating portion that is intermittently discharged, the measuring portion that measures the end height in the width direction of the coating formed on the substrate by discharging the paint, and the end height measured by the measuring portion. The coating gap between the coating part and the base material and the base part from the coating part are set so that the end height of the coated material formed on the base material after the formation of the work piece becomes a preset target value. A control unit that controls a discharge amount of the paint discharged toward the material.

  In this coating apparatus, the end height in the width direction of the coated object is measured, and the coating gap and the discharge amount of the paint are controlled based on the measured end height. In this way, by controlling the coating gap and the discharge amount of the paint based on the measured end height, the width of the coated object is not adversely affected on the shape near the center in the width direction and the basis weight. The shape of both ends in the direction can be corrected quickly.

  Further, the measurement unit further measures the basis weight of the coated material formed on the substrate by discharging the paint, and the control unit is based on the basis weight measured by the measuring unit and thereafter the coating material is formed. The coating weight between the coating part and the base material is discharged so that the basis weight of the coated material formed on the base material reaches a preset target value. The amount of paint discharged may be controlled. In this case, the coating gap and the coating amount can be controlled based on the measured end height and basis weight, and the end height and basis weight can be corrected at a time, so that the coating conditions can be optimized more quickly.

  Further, the control unit (A) the relationship between the change amount of the end height with respect to the change amount of the coating gap, (B) the relationship of the change in basis weight with respect to the change amount of the coating gap, and (C) the discharge amount of the paint. The control value of the left and right average value of the coating gap is determined by previously holding the relationship of the amount of change of the basis weight with the amount of change and referring to the relationship of (A) based on the end height measured by the measurement unit. The left and right control values of the coating gap are determined by referring to the relationship (B) based on the left-right difference in the basis weight measured by the measuring unit and the control value of the left-right average value of the coating gap. The control value for the discharge amount of the paint may be determined by referring to the relationship (C) based on the left-right average value of the basis weight measured by the measurement unit. By such processing, it is possible to ensure the accuracy of the shape of both ends in the width direction of the coated product while quickly optimizing the coating conditions.

  Further, the control unit determines the control value of the paint discharge amount by correcting the fluctuation of the left-right average value of the basis weight by the control value of the left-right average value of the coating gap by referring to the relationship of (B). May be. By such processing, it is possible to ensure the accuracy of the shape of both ends in the width direction of the coated product while quickly optimizing the coating conditions.

  Moreover, the measurement part may be comprised by the non-contact displacement meter or the non-contact thickness meter. In this case, the shape can be measured without changing the state of the coated material.

  Moreover, the coating method which concerns on 1 side of this invention discharges a slurry-form coating material from the coating part toward the sheet-like base material conveyed by a conveyance part, and intermittently applies a coating material on a base material. Based on the coating step to be formed, the measuring step of measuring the end height in the width direction of the coated material formed on the substrate by discharging the paint, and the end height measured by the measuring unit, From the coating part and the coating gap between the coating part and the base material, so that the end height of the coating object formed on the base material after the formation of the coated product becomes a preset target value. And a control step of controlling a discharge amount of the paint discharged toward the base material.

  In this coating method, the end height in the width direction of the coated product is measured, and the coating gap and the discharge amount of the paint are controlled based on the measured end height. In this way, by controlling the coating gap and paint discharge amount based on the measured edge height, the coating conditions can be quickly adjusted without adversely affecting the shape and weight per unit area in the width direction. Can be corrected.

  Further, in the measurement process, the basis weight of the coated product formed on the substrate by further discharging the paint is further measured, and in the control step, based on the basis weight measured by the measurement unit, after the formation of the coated product The coating weight between the coating part and the base material is discharged so that the basis weight of the coated material formed on the base material reaches a preset target value. The amount of paint discharged may be controlled. In this case, the coating gap and the coating amount can be controlled based on the measured end height and basis weight, and the end height and basis weight can be corrected at a time, so that the coating conditions can be optimized more quickly.

  Further, in the control step, (A) the relationship between the change amount of the end height with respect to the change amount of the coating gap, (B) the relationship between the change amount of the basis weight with respect to the change amount of the coating gap, and (C) the discharge amount of the paint. The control value of the left and right average value of the coating gap is determined by previously holding the relationship of the amount of change of the basis weight with the amount of change and referring to the relationship of (A) based on the end height measured by the measurement unit. The left and right control values of the coating gap are determined by referring to the relationship (B) based on the left-right difference in the basis weight measured by the measuring unit and the control value of the left-right average value of the coating gap. The control value for the discharge amount of the paint may be determined by referring to the relationship (C) based on the left-right average value of the basis weight measured by the measurement unit. By such processing, it is possible to ensure the accuracy of the shape of both ends in the width direction of the coated product while quickly optimizing the coating conditions.

  Further, in the control step, by referring to the relationship (B), the control value of the paint discharge amount is determined by correcting the variation of the left-right average value of the basis weight due to the control value of the left-right average value of the coating gap. May be. By such processing, it is possible to ensure the accuracy of the shape of both ends in the width direction of the coated product while quickly optimizing the coating conditions.

  In the measurement process, a non-contact displacement meter or a non-contact thickness meter may be used. In this case, the shape can be measured without changing the state of the coated material.

  According to the coating apparatus and the coating method, since both end shapes in the width direction of the coated product are made into appropriate shapes, the coating conditions can be quickly optimized.

It is the schematic which shows the coating apparatus which concerns on one Embodiment of this invention. It is a figure which shows the functional component of the control part used for the coating apparatus shown in FIG. It is a top view which shows the mode of the measurement of the coating material by a non-contact displacement meter. It is a figure explaining the end height of a coating material, the fabric weight of a coating material, and a coating gap. It is a graph which shows an example of the relationship of the variation | change_quantity of the end height with respect to the variation | change_quantity of a coating gap. It is a graph which shows an example of the relationship of the variation | change_quantity of the fabric weight with respect to the variation | change_quantity of a coating gap. It is a graph which shows an example of the relationship of the variation | change_quantity of the fabric weight with respect to the variation | change_quantity of the discharge amount of a coating material. It is a flowchart which shows the coating method which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of a coating apparatus and a coating method according to one aspect of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing a coating apparatus according to an embodiment of the present invention. As shown in the figure, the coating apparatus 1 is incorporated in an electrode production line built in a power storage device such as a lithium ion secondary battery. The coating apparatus 1 is configured as an apparatus that intermittently coats an electrode paste (paint) P with a predetermined width on one surface side of a metal foil (base material) 2 conveyed in one direction by a back roller 6 by a die coating method. Yes.

  The coating apparatus 1 includes a transport mechanism (transport section) 3 that transports the metal foil 2, a coating mechanism 4 that coats the electrode paste P, and a control mechanism 5 that controls coating conditions in the coating apparatus 1. And. The transport mechanism 3 includes a feeding roller and a winding roller (not shown) of the sheet-like metal foil 2 and a back roller 6. By the cooperation of these rollers, the metal foil 2 is conveyed at a constant speed from the feeding roller disposed on the lower side toward the winding roller disposed on the upper side. The back roller 6 is disposed at a position facing a coating head 12 described later, and the conveying direction of the metal foil 2 is folded along the peripheral surface of the back roller 6. A drying device (not shown) for drying the electrode pattern Q formed by applying the electrode paste P is disposed between the back roller 6 and the winding roller. The temperature and path length of the drying apparatus are set so that most of the solvent in the electrode pattern Q (see FIG. 2) evaporates when the metal foil 2 passes through the path inside the drying apparatus at a constant speed. Yes.

  The coating mechanism 4 includes a paste tank 11 that stores the electrode paste P, a coating head (coating unit) 12 that discharges the electrode paste P, and a supply that supplies the electrode paste P from the paste tank 11 to the coating head 12. And a pump 13. Further, the coating mechanism 4 pastes the electrode paste P supplied from the first opening / closing valve 16 and the supply pump 13 for stopping the supply of the electrode paste from the supply pump 13 to the coating head 12 as needed. A second on-off valve 17 is provided for returning to the position. Each of the 1st on-off valve 16 and the 2nd on-off valve is comprised by the electromagnetic control valve, for example.

  The paste tank 11 and the supply pump 13 are connected to the coating head 12 by a pipe 14. By adjusting the rotation speed of the supply pump 13, the discharge amount of the electrode paste P discharged from the coating head 12 can be adjusted. Further, in the pipe 14, another pipe 18 connected to the paste tank 11 is connected between the supply pump 13 and the coating head 12. The first on-off valve 16 is arranged between the connection portion between the pipe 14 and the pipe 18 and the coating head 12, and the second on-off valve 17 is arranged on the pipe 18. Thereby, at the time of formation of the uncoated part in intermittent coating, the electrode paste P supplied from the paste tank 11 is not sent to the coating head 12 by the closing of the first opening / closing valve 16, but the second opening / closing. When the valve 17 is opened, it is circulated to the paste tank 11 via the pipe 18.

  The electrode paste P stored in the paste tank 11 is a slurry-like paint containing, for example, an active material, a binder, and a solvent. The electrode paste P may further contain a conductive aid such as acetylene black or a thickener. The active material may be either a positive electrode active material or a negative electrode active material. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. The composite oxide includes, for example, at least one of manganese, nickel, cobalt, and aluminum and lithium.

  Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5 ) And the like, and boron-added carbon. The paste tank 11 may be provided with heating means such as a heater. In this case, the viscosity of the electrode paste P can be appropriately adjusted by heating the electrode paste P in the paste tank 11 with a heating means.

  The coating head 12 is a part that applies the electrode paste P to the metal foil 2. A slit-like discharge port 12 a (see FIG. 4) for discharging the electrode paste P is provided on the tip side of the coating head 12. The coating head 12 is disposed substantially horizontally so that one surface side of the metal foil 2 conveyed by the conveying mechanism 3 and the discharge port 12a face each other, and receives the supply of the electrode paste P from the paste tank 11 to receive the metal Electrode paste P is discharged onto the foil 2.

  In the present embodiment, the electrode paste P is discharged to the metal foil 2 at the folding position in the conveying direction of the metal foil 2 by the back roller 6, and a rectangular electrode pattern (coating material) Q is formed on one surface side of the metal foil 2. Are formed intermittently. The coating head 12 is provided with a coating head drive unit 15 (see FIG. 3) such as a servo motor. The position of the coating head 12 can be adjusted in the horizontal direction by the coating head drive unit 15. Thereby, adjustment of the space | interval (namely, coating gap) from the discharge outlet 12a to the one surface side of the metal foil 2 is possible.

The control mechanism 5 includes a displacement meter (measurement unit) 21 that measures the shape of the electrode pattern Q formed on the metal foil 2, and a control unit 22 that controls coating conditions based on the measurement result of the displacement meter 21. It has. The displacement meter 21 is a non-contact displacement meter such as a laser displacement meter, for example. The displacement meter 21 is arranged so as to face one surface side of the metal foil 2 above the position where the electrode paste P is applied. As shown in FIG. 2, the displacement meter 21 has an electrode pattern Q (hereinafter referred to as “initial electrode pattern Q ₀ ”) formed first after the application of the electrode paste P to the metal foil 2 by the coating apparatus 1 is started. and referred) is scanned in the width direction (direction perpendicular to the conveying direction of the metal foil 2) with respect to, the measurement of the shape of the width direction of the initial electrode pattern Q _0. The displacement meter 21 may be an X-ray non-contact thickness meter.

  The control unit 22 is physically a computer system including a storage unit such as a CPU, a memory, a communication interface, and a hard disk. The control unit 22 is connected to the displacement meter 21, the supply pump 13, and the coating head driving unit 15 so as to be able to transmit and receive signals. As shown in FIG. 3, the control unit 22 includes a measurement result receiving unit 23, a control amount calculation unit 24, and a reference information storage unit 25 as functional components.

  The measurement result receiving unit 23 is a part that receives the measurement result of the shape in the width direction of the electrode pattern Q from the displacement meter 21. The measurement result reception unit 23 outputs the received measurement result to the control amount calculation unit 24.

  The control amount calculation unit 24 is a part that calculates the control amount of the coating conditions. The control amount calculation unit 24 calculates the end height A in the width direction and the basis weight B in the electrode pattern Q based on the measurement result received from the measurement result reception unit 23. Further, the control amount calculation unit 24 calculates the discharge amount C of the electrode paste P based on the rotation speed of the supply pump 13 and applies the coating based on the position signal in the coating head driving unit 15 or the value of the dial gauge. The gap G is calculated.

FIG. 4 is a diagram for explaining the end height of the coated product, the basis weight of the coated product, and the coating gap. As shown in the figure, in the electrode pattern Q, the end height A indicates the raised height of the end portion in the width direction with respect to the center portion. The end height A has a positive value when the end portion is raised with respect to the central portion, and has a negative value when the end portion is recessed with respect to the central portion. In the present embodiment, of the rightmost high A _R and left height A _L, the larger value of the absolute value is used as an end height A.

In the electrode pattern Q, the basis weight B indicates the mass per unit area in the portion excluding the end portion. In the present embodiment, a right eye amount _BR and a left eye amount _BL are used. The basis weight B is proportional to the thickness of each part of the electrode pattern Q when the component and the component ratio of the electrode paste P are constant. Therefore, the right eye weight _BR is calculated based on the thickness of an arbitrary position excluding the end in the region on the right side of the center line L in the width direction of the electrode pattern Q. Further, the left basis weight _BL is measured at an arbitrary position excluding the end portion in the region on the left side of the center line L in the width direction of the electrode pattern Q. The position for calculating the thickness is arbitrary, but it is preferable to set the thickness symmetrically so that the distance from the center line L is equal.

The coating gap G indicates the distance from the discharge port 12a to the one surface side of the metal foil 2. In the present embodiment, Miginuriko gap G _R and Hidarinuriko gap G _L are used, respectively. Miginuriko gap G _R is the spacing from the right edge of the discharge port 12a to the one surface side of the metal foil 2, Hidarinuriko gap G _L is the distance from the left edge of the discharge port 12a to the one surface side of the metal foil 2 is there.

After calculating the end height A and the basis weight B of the initial electrode pattern Q ₀ , the control amount calculation unit 24 refers to the reference information storage unit 25, and sets the discharge amount C of the electrode paste P and the control value of the coating gap G. calculate. The control unit 22 controls the rotation speed of the supply pump 13 and the position of the coating head driving unit 15 based on the calculated control value, and the discharge amount C of the electrode paste P and the coating gap G are preset. The discharge amount C and the coating gap G are adjusted with respect to the initial values so that the target values are obtained.

  The reference information storage unit 25 stores a target value of the end height A and a target value of the basis weight B for the electrode pattern Q in the coating currently being performed by the coating apparatus 1. These target values are, for example, values that are input to the control unit 22 by an operator in advance every time coating is performed. Further, in the reference information storage unit 25, for the coating apparatus 1, (A) the relationship between the variation amount of the end height A with respect to the variation amount of the coating gap G, and (B) the basis weight with respect to the variation amount of the coating gap G. The relationship between the change amount of B and the change amount of the basis weight B with respect to the change amount of the discharge amount C of the electrode paste P are stored.

  FIG. 5 is a graph showing an example of the relationship between the change amount of the end height A and the change amount of the coating gap G. In the example shown in the figure, the horizontal axis is the left-right average value of the coating gap G, the vertical axis is the end height A, the left-right average value of the coating gap G is the normalized value, and the end height A is the measured value. Has been. The coating gap G is standardized with the coating gap G when the end height A is 0 μm being 100. This graph is obtained in advance by measuring the end height A while changing the left-right average value of the coating gap G in the coating apparatus 1 while keeping the discharge amount C of the electrode paste P constant. It is. The graph shows that there is a proportional relationship between the end height A and the left-right average value of the coating gap G.

FIG. 6 is a graph showing an example of the relationship between the change amount of the basis weight B and the change amount of the coating gap G. In the example of the figure, the horizontal axis represents the left-right difference of the coating gap G, and the vertical axis represents the basis weight B. Both the coating gap G and the basis weight B are indicated by normalized values. The basis weight B is standardized with the target value of the basis weight B being 100. This graph, in the coating apparatus 1, while keeping constant the Hidarinuriko gap G _L, measuring quantity with right B _R and amount with left B _L respectively while changing the Miginuriko gap G _R Is obtained in advance. The graph shows that there is a proportional relationship between the basis weight B and the coating gap G.

Further, the graph shows a right-weight per unit of change in the coating gap G on the other side when the coating gap G on one side is fixed and the coating gap G on the other side is changed in the coating apparatus 1. the difference between the amount of change in the amount B _R and the variation of the left eye with the amount B _L (i.e., the difference between the slope of the graph) shows that occurs. This is the amount of difference between Miginuriko gap G _R and Hidarinuriko gap G _L, and further show that the right eye with the amount B _R and the left eye with the amount B _L is changed, respectively.

In this example, keeping the Hidarinuriko gap G _L constant, but by varying the Miginuriko gap G _R are respectively measured right eye with the amount B _R and the left eye with the amount B _L, Miginuriko gap keeping G _R constant, Hidarinuriko in the case of changing the gap G _L is the coating amount of change in the right eye with the amount B _R with respect to the amount of change in the gap G and the change amount of the difference (a graph of the left eye with the amount B _L Is reversed from the case of FIG.

  FIG. 7 is a graph showing an example of the relationship between the change amount of the basis weight B and the change amount of the discharge amount C of the electrode paste P. In the example of the figure, the horizontal axis represents the left and right average values of the discharge amount C and the vertical axis represents the basis weight B, and both the discharge amount C and the basis weight B are indicated by normalized values. The discharge amount C is standardized with the discharge amount C when the basis weight B is the target value being 100. This graph is obtained in advance in the coating apparatus 1 by measuring the left and right average value of the basis weight B while changing the discharge amount C while keeping the coating gap G constant. The graph shows that there is a proportional relationship between the discharge amount C and the basis weight B.

  Then, the coating method of the electrode paste P using the coating apparatus 1 mentioned above is demonstrated.

  FIG. 8 is a flowchart showing a method of applying the electrode paste P. As shown in the figure, in this coating method, first, by the cooperation of the transport mechanism 3 and the coating mechanism 4 of the coating apparatus 1, a slurry-like shape is applied from the coating head 12 toward the sheet-like metal foil 2. The electrode paste P is discharged, and intermittent application of the electrode pattern Q to one surface side of the metal foil 2 is started (step S01). At the start of coating, initial values of the coating gap G and discharge amount C, and target values of the end height A and basis weight B of the electrode pattern Q are input to the coating apparatus 1 in advance.

After the start of coating, with respect to the initial electrode pattern Q ₀ initially formed on the metal foil 2, the end height A (right end height _AR and left end height _AL ) by the displacement meter 21 and the basis weight B (right basis weight B) _R and left eye weight B _L ) are measured (step S02). After measuring the end height A and the basis weight B, the control unit 22 makes the end height A and the basis weight B become preset target values based on the actually measured end height A and the basis weight B. Control values for the coating gap G and the discharge amount C are calculated (step S03). And the control part 22 adjusts so that the coating gap G and the discharge amount C may become an appropriate value based on the calculated control value (step S04). The subsequent application of the electrode paste P is performed based on the adjusted coating gap G and discharge amount C (step S05).

  Hereinafter, an example of calculation of the control amount of the coating gap G and the discharge amount C will be shown.

In this example, 200 [mu] m an initial value of Miginuriko gap _{G R} and Hidarinuriko gap _{G L,} the initial value of the discharge amount C and 200 cc / min, ± a target value of the edge height A of the electrode pattern Q 0 .mu.m, right the target value of the biasing amount _{B R} and the left eye with the amount _{B L} and 200 g / ^{m 2.} The initial electrode pattern Q actually measured end height A is + 5 [mu] m in the displacement gauge 21 at _0, the amount with the right eye are calculated on the basis of the thickness B _R is 190 g / m ^2, the amount with the left eye calculated based on the thickness B Let _L be 193 g / m ² .

  In this case, it can be seen from the graph shown in FIG. 5 that the left-right average value of the coating gap G is 5.8% higher than the appropriate value. Therefore, in order to set the end height A to the target value of ± 0 μm, the left-right average value of the coating gap G may be changed from the initial value 200 μm to the appropriate value 189 μm. Thereby, the control value of the left-right average value of the coating gap G is determined to be -11 μm.

Further, in the above example, the ratio of the right eye with the amount _{B R} for the left eye with the amount _{B L} has a 101.6%. In this case, from the graph shown in FIG. 6, it can be seen that Miginuriko gap _{G R} becomes 11.5% higher than the Hidarinuriko gap _{G L.} Therefore, in order to equalize the right eye with the amount B _R and the left eye with the amount B _L, while maintaining the left and right average value of coating gap G to an appropriate value 189Myuemu, Miginuriko gap G _R is Hidarinuriko gap G so 11.5% lower than the _L, may be changed Miginuriko gap _{G R} to a proper value (189μm × 94.25% = 178μm) . Thus, the control value of Miginuriko gap _{G R} is -22Myuemu control value of Hidarinuriko gap _{G L} is determined to be 0 .mu.m.

Furthermore, in the above example, the left-right average value of the basis weight B is 191.5 g / m ² . In this case, the discharge amount C is determined from the graph shown in FIG. 7. At this time, the fluctuation of the left and right average value of the basis weight B with respect to the control value of the left and right average value of the coating gap G determined from the graph of FIG. It is preferable to determine the discharge amount C by correcting the above. In this example, the control value of the left-right average value of the coating gap G is −11 μm, and the change amount of the left-right average value of the basis weight B corresponding to this is −0.7% from the graph of FIG. The left and right average value of the estimated basis weight B after correction is 190.2 g / m ² . Thereby, the appropriate value of the discharge amount C is 212 cc / min, and the control value of the discharge amount is determined to be +12 cc / min.

By the above processing, the electrode pattern Q of the initial electrode pattern _{Q 0} later, Miginuriko gap _G R 178 um, Hidarinuriko gap _G L 200 [mu] m, are coated by the coating conditions of the discharge amount C212cc / min.

  As described above, in the coating apparatus 1 and the coating method, the end height A and the basis weight B in the width direction of the electrode pattern Q are measured, and the coating gap is based on the measured end height A and the basis weight B. G and the discharge amount C of the electrode paste P are controlled. Thus, by controlling the coating gap G and the discharge amount C of the electrode paste P based on the measured end height A and basis weight B, the shape near the center in the width direction and the basis weight are adversely affected. Without giving, the shape of both ends of the electrode pattern Q in the width direction can be quickly corrected. Further, by controlling the coating gap G and the discharge amount C of the electrode paste P with respect to the initial values, even when the coating conditions of the coating apparatus 1 are changed due to environmental factors or continuous factors, The working conditions can be optimized quickly, and the yield of the electrode pattern Q can be improved.

In the present embodiment, (A) the relationship between the change amount of the end height A with respect to the change amount of the coating gap G, (B) the relationship between the change amount of the basis weight B with respect to the change amount of the coating gap G, and (C). The relationship between the change amount of the basis weight B with respect to the change amount of the discharge amount C of the electrode paste P is held in advance. Then, by referring to the relationship (A) based on the end height A of the initial electrode pattern Q ₀ measured by the displacement meter 21, the control value of the left-right average value of the coating gap G is determined, and the displacement meter 21. The left and right control values of the coating gap G are determined by referring to the relationship (B) based on the left-right difference of the basis weight B measured by the above and the control value of the left-right average value of the coating gap G. The control value of the discharge amount C of the electrode paste P is determined by referring to the relationship (C) based on the left-right average of the basis weight B measured by the displacement meter 21. By such processing, it is possible to ensure the accuracy of the shape of both ends of the electrode pattern Q in the width direction while quickly optimizing the coating conditions.

  Further, in the present embodiment, the control unit corrects the left-right average fluctuation of the basis weight B by the control value of the left-right average value of the coating gap G by referring to the relationship (B) above, and the electrode paste P The control value of the discharge amount C is determined. By such processing, it is possible to ensure the accuracy of the shape of both ends of the electrode pattern Q in the width direction while quickly optimizing the coating conditions.

  Moreover, in this embodiment, the displacement meter 21 is comprised with the non-contact displacement meter or the non-contact thickness meter. Thereby, the thickness of the electrode pattern Q before drying immediately after coating can be measured. When using a contact-type displacement meter or a contact-type thickness meter, it is necessary to measure the thickness after completion of drying, and coating under inappropriate conditions is continued until the first electrode pattern Q is dried. However, by using a non-contact displacement meter or a non-contact thickness meter, it is possible to measure the thickness immediately after coating and change the coating conditions, thereby further improving the yield.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the displacement gauge 21 is scanned in the width direction of the initial electrode pattern Q _0, is performed to measure the shape of the width direction of the initial electrode pattern Q _0, the width of the initial electrode pattern Q ₀ The shape may be measured only at four points, that is, the measurement positions of the end heights at both ends in the direction and the measurement positions of the left and right basis weights. Moreover, although the non-contact displacement meter was illustrated as the displacement meter 21 in the said embodiment, you may use a contact displacement meter. In this case, for example, it is preferable to measure the shape of the electrode pattern Q in a dry state through a drying furnace using a contact displacement meter.

In the above embodiment, the end height A and the basis weight B are calculated by measuring the shape in the width direction of the initial electrode pattern Q _{0 with} the displacement meter 21. is not limited to the pattern Q _0, it may be an electrode pattern Q formed after this.

  DESCRIPTION OF SYMBOLS 1 ... Coating apparatus, 2 ... Metal foil (base material), 3 ... Conveyance mechanism (conveyance part), 12 ... Coating head (coating part), 21 ... Displacement meter (measurement part), 22 ... Control part, A ... end height, B ... basis weight, C ... discharge amount, G ... coating gap, P ... electrode paste (paint), Q ... electrode pattern (coating material).

Claims (4)

A transport unit for transporting a sheet-like base material in the longitudinal direction;
A coating unit that intermittently discharges slurry-like paint toward the base material transported by the transport unit;
A measuring unit that measures an end height in a width direction of a coated material formed on the base material by discharging the paint and a basis weight of the coated material formed on the base material by discharging the paint. When,
Based on the end height measured by the measuring unit, the coating height is set so that the end height of the coated material formed on the base material after the formation of the coated material becomes a preset target value. A control unit that controls a coating gap between the coating part and the base material, and a discharge amount of the paint discharged from the coating part toward the base material ,
The controller is
(A) The relationship of the amount of change of the end height to the amount of change of the coating gap, (B) The relationship of the change of the basis weight to the amount of change of the coating gap, and (C) The change of the discharge amount of the paint. Pre-holding the relationship between the amount of change in the basis weight with respect to the amount,
By determining the control value of the left and right average value of the coating gap by referring to the relationship (A) based on the end height measured by the measurement unit,
By referring to the relationship (B) based on the left-right difference in the basis weight measured by the measuring unit and the control value of the left-right average value of the coating gap, the left and right control of the coating gap Determine the value,
After correcting the left-right average value of the basis weight measured by the measurement unit based on the variation by the control value of the left-right average value of the coating gap, by referring to the relationship of (C), A coating device that determines the control value of the discharge rate . The measurement unit coating apparatus of claim 1, wherein is formed by a non-contact displacement gauge or a non-contact thickness meter. A coating process in which slurry-like paint is discharged from the coating unit toward the sheet-like base material transported by the transport unit, and a coating material is intermittently formed on the base material, and
The measurement unit measures the end height in the width direction of the coated material formed on the substrate by discharging the coating material and the basis weight of the coated material formed on the substrate by discharging the coating material. Measuring process to
Based on the end height measured by the measuring unit, the coating height is set so that the end height of the coated material formed on the base material after the formation of the coated material becomes a preset target value. A control step for controlling a coating gap between the coating part and the base material, and a discharge amount of the paint discharged from the coating part toward the base material ,
In the control step,
(A) The relationship of the amount of change of the end height to the amount of change of the coating gap, (B) The relationship of the change of the basis weight to the amount of change of the coating gap, and (C) The change of the discharge amount of the paint. Pre-holding the relationship between the amount of change in the basis weight with respect to the amount,
By determining the control value of the left and right average value of the coating gap by referring to the relationship (A) based on the end height measured by the measurement unit,
By referring to the relationship (B) based on the left-right difference in the basis weight measured by the measuring unit and the control value of the left-right average value of the coating gap, the left and right control of the coating gap Determine the value,
After correcting the left-right average value of the basis weight measured by the measurement unit based on the variation by the control value of the left-right average value of the coating gap, by referring to the relationship of (C), A coating method that determines the control value of the discharge rate . The coating method according to claim 3 , wherein a non-contact displacement meter or a non-contact thickness meter is used in the measuring step.

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