JP2018149492A - Gravure coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gravure coating device which can adjust an amount of coating material transferred to a part of a base material sheet opposite to an end part of a gravure roll in a rotation shaft direction in the middle of coating.SOLUTION: A gravure coating device includes a storage part of ceramic slurry, and a gravure roll 25 on which coating material in the storage part is adhered to an outer circumference surface and which can integrally rotate with a rotation shaft 26 so as to transfer the coating material stored in the storage part to a conveyed base material sheet. A groove 29 extending obliquely to a rotation shaft direction exists on the outer circumference surface of the gravure roll 25 from one end part 25a to the other end part 25b of the gravure roll 25 in the rotation shaft direction. The gravure coating device includes a control part 33 which changes rotation angles of the one end part 25a and the other end part 25b of the gravure roll 25 with respect to a rotation angle of a center part 25c of the gravure roll 25 in the rotation shaft direction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a gravure coating apparatus that transfers a paint onto a base sheet by a gravure roll.

  A gravure coating apparatus is mentioned as an example of the coating apparatus for applying a coating material to the conveyed base material sheet. The gravure coating apparatus includes a paint storage unit, and a columnar gravure roll to which the paint stored in the storage unit is attached and can rotate integrally with a rotation shaft. On the outer peripheral surface of the gravure roll, a diagonal groove is engraved from one end to the other end in the direction of the rotation axis. And by rotating a gravure roll, the coating material adhering to the surface of a gravure roll is transcribe | transferred to the surface of a base material sheet, and the coating part of a coating material is formed. The coating part of the paint has the same width as the dimension of the gravure roll in the rotation axis direction.

  In such a gravure coating apparatus, the amount of paint transferred to the portion of the base sheet facing the end of the gravure roll in the rotation axis direction may increase. In this case, the thickness of the end portion in the width direction of the coated portion is thicker than the thickness of the central portion. In the gravure roll disclosed in Patent Document 1, in order to solve this problem, the inclination angle of the groove of the gravure roll with respect to the axis of the rotation shaft is made larger at one end than the central portion in the rotation shaft direction. As a result, the paint that has entered the groove existing at one end of the gravure roll is more likely to flow down due to gravity than the paint that has entered the groove present at the center, and the part of the base sheet facing the one end of the gravure roll The amount of paint transferred is reduced. As a result, the difference between the thickness of the one end portion in the width direction of the coated portion and the thickness of the central portion can be reduced.

Japanese Patent Laid-Open No. 11-005052

  Depending on the viscosity of the paint, the error in the rotation speed of the gravure roll, the surface tension, etc., the amount of the paint transferred to the base sheet may change during the coating of the paint. In the gravure roll disclosed in Patent Document 1, I can not cope.

  The objective of this invention is providing the gravure coating apparatus which can adjust the quantity of the coating material transferred to the part facing the rotation-axis direction edge part of a gravure roll in a base material sheet in the middle of coating.

  The gravure coating apparatus for solving the above-mentioned problems is a paint storage unit, and the coating material stored in the storage unit is transferred to the substrate sheet to be conveyed. And a gravure coating device provided with a gravure roll that can rotate integrally with a rotary shaft, wherein the outer peripheral surface of the gravure roll has a groove extending obliquely with respect to the rotation axis direction or the rotation axis direction. Is present from one end to the other end of the gravure roll in the rotation axis direction, and the rotation angle of at least one of the one end and the other end is relative to the rotation angle of the central portion in the rotation axis direction of the gravure roll. The gist is to provide a control unit to be changed.

  According to this, the end portion whose rotation angle has been changed by changing the rotation angle of at least one of the one end portion and the other end portion in the rotation axis direction of the gravure roll with respect to the rotation angle of the central portion by the control unit. Is twisted in the circumferential direction with respect to the central portion. For example, the rotation angle of the one end portion is changed with respect to the rotation angle of the central portion so that the inclination angle of the groove with respect to the axis of the rotation shaft is larger at the one end portion than the central portion. In this case, the paint that has entered the groove at one end is more likely to flow down by gravity than the paint that has entered the groove at the center, and the amount of paint transferred to the portion of the base sheet facing the one end of the gravure roll is small. The thickness is reduced. In this way, by changing the rotation angle of the end of the gravure roll with respect to the rotation angle of the central portion by the control unit, the coating material transferred to the portion of the base sheet facing the end where the rotation angle is changed. The amount can be adjusted during coating.

  In the gravure coating apparatus, the rotation shaft includes a first shaft portion that pivotally supports the one end portion, a second shaft portion that pivotally supports the other end portion, and a third shaft that pivotally supports the central portion. The third shaft portion, one end of which is connected to the first shaft portion by a first universal joint, and the other end of the third shaft portion is connected to the second shaft portion by a second universal joint. preferable.

  Accordingly, the first universal joint can smoothly change the rotation angle of the one end portion with respect to the rotation angle of the central portion. Similarly, the rotation angle of the other end can be smoothly changed with respect to the rotation angle of the central portion by the second universal joint.

  The gravure coating apparatus includes a first motor that rotationally drives the first shaft portion of the rotating shaft, and a second motor that rotationally drives the second shaft portion of the rotating shaft, and the control unit includes: It is preferable that the driving of the first motor and the second motor can be individually controlled.

  According to this, the first motor and the second motor are controlled by the control unit, and the rotation speed of the first shaft part and the rotation speed of the second shaft part are made different so that the one end part and the other end part of the gravure roll are different. The rotation angle can be changed with respect to the rotation angle at the center.

  Moreover, about the said gravure coating apparatus, it is preferable that the said control part controls the drive of a said 1st motor and a said 2nd motor based on the thickness of the said coating material transcribe | transferred to the said base material sheet.

According to this, the control part can change the rotational speed of a 1st axial part and a 2nd axial part based on the thickness of the coating material transcribe | transferred by the base material sheet.
Moreover, about the said gravure coating apparatus, it is preferable that the said gravure roll is hard rubber whose durometer hardness is 60-90.

  According to this, when the durometer hardness is less than 60, there is a possibility that the outer peripheral surface of the gravure roll is worn by repeating the transfer of the paint. When the outer peripheral surface is worn, the amount of paint entering the groove is reduced, and the amount of paint transferred to the base sheet may be smaller than before wear. When the durometer hardness exceeds 90, when the rotation angle of one end or the other end of the gravure roll is changed with respect to the rotation angle of the center, not only the one end or the other end but also the center is twisted. Therefore, there is a possibility that the angle of inclination of the central portion with respect to the axis of the rotating shaft may change. Thus, from the viewpoint of wear resistance and twist of the gravure roll, the gravure roll is preferably a hard rubber having a durometer hardness of 60 to 90.

  ADVANTAGE OF THE INVENTION According to this invention, the quantity of the coating material transferred to the part facing the edge part of the rotating shaft direction of a gravure roll in a base material sheet can be adjusted in the middle of coating.

The perspective view of an electrode. Sectional drawing of a gravure coating apparatus. The perspective view which shows a gravure coating apparatus partially. Sectional drawing of a gravure coating apparatus. (A), (b) is a side view which shows a gravure roll typically.

Hereinafter, an embodiment embodying a gravure coating apparatus will be described.
In the present embodiment, a gravure coating apparatus that transfers a ceramic slurry for forming a protective layer on a strip electrode in the process of manufacturing an electrode of a secondary battery will be described. In the present embodiment, the secondary battery is not shown, but is a square battery having a rectangular external appearance, and is a lithium ion battery. The secondary battery includes an electrode assembly in a case. The electrode assembly is a stacked type in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked with a separator therebetween being insulated by a separator.

  As shown in FIG. 1, an electrode 10 for a secondary battery is provided on a rectangular metal foil 11, a rectangular active material layer 12 provided on both surfaces of the metal foil 11, and a surface of the active material layer 12. The protective layer (insulating layer) 19 is provided. The electrode 10 has an uncoated portion 13 along which the active material layer 12 is not provided and the metal foil 11 is exposed. And in the electrode 10, the current collection tab 14 is provided in the state in which a part of the uncoated part 13 protrudes. In this embodiment, the negative electrode 10 is provided with a protective layer 19 that covers the entire surface of the active material layer 12 and a part of the uncoated portion 13. The protective layer 19 includes alumina particles as ceramic particles and a resin binder, and the alumina particles or the alumina particles and the active material particles on the surface of the active material layer 12 have a layer structure through the binder. .

Although not shown, the manufacturing process of the negative electrode 10 includes an active material layer forming process, a protective layer forming process, and a cutting process.
The active material layer forming step is a step of forming the active material layer 12 on both surfaces of the long metal foil 11a. Specifically, the active material paste is applied to the long metal foil 11a and then dried to form the active material layer precursor on the long metal foil 11a. By passing this through a roll press machine in the pressing step, the active material density of the active material layer precursor is increased, and the active material layer 12 having a predetermined density and thickness is formed. The long metal foil 11 a on which the active material layer 12 is formed becomes a strip electrode 16.

  As shown in FIG. 2, the protective layer forming step is a step of forming the protective layer 19 on the surface of the active material layer 12 by passing the strip electrode 16 through the gravure coating apparatus 20. The ceramic slurry 15 is applied to the active material layer 12 and a part of the uncoated portion 13 so as to cover the entire surface of the active material layer 12, but in FIG. 19 coatings are not shown. After the ceramic slurry 15 is applied, the protective layer 19 is formed by drying with a drying furnace 50. The strip electrode 16 on which the protective layer 19 is formed becomes the electrode material 17.

The cutting step is a step of punching and forming the electrode material 17 into the shape of the negative electrode 10 by press cutting. Thereby, the sheet-like negative electrode 10 is manufactured.
As shown in FIGS. 2 and 3, the gravure coating apparatus 20 for performing the coating process of the ceramic slurry 15 has a supply reel 21, and a strip electrode 16 is wound around the supply reel 21. . The supply reel 21 is rotatably supported by a support device (not shown). Further, the gravure coating device 20 has a take-up reel 22 on the side of the supply reel 21, and the take-up reel 22 is rotatably supported by a support device (not shown) and rotates at a constant rotational speed. To do. Further, the gravure coating apparatus 20 has a pair of backup rollers 23 that press the strip electrode 16 near the transfer position P of the ceramic slurry 15. Then, the supply reel 21, the take-up reel 22 and the backup roller 23 rotate in the rotation direction Y1, and the belt-like electrode 16 supplied from the supply reel 21 is taken up by the take-up reel 22, whereby the belt-like electrode 16 is conveyed. The A path through which the strip-shaped electrode 16 passes when the supply reel 21, the take-up reel 22, and the backup roller 23 rotate in the rotation direction Y <b> 1 is a transport path of the strip-shaped electrode 16. At the transfer position P of the ceramic slurry 15, the strip electrode 16 is conveyed in a state along the horizontal direction. Hereinafter, a direction in which the strip electrode 16 is transported is defined as a transport direction X1, and a direction along the surface of the strip electrode 16 and orthogonal to the transport direction X1 is defined as a width direction X2.

  The gravure coating apparatus 20 includes a reservoir 24 for the ceramic slurry 15 and a cylindrical gravure roll 25. The storage unit 24 is disposed below a portion sandwiched between the pair of backup rollers 23 in the belt-like electrode 16 transported in the transport direction X1. The gravure roll 25 is rotatably supported by a rotating shaft 26 between the strip electrode 16 and the storage unit 24. The gravure roll 25 is supported in a state in which a part in the circumferential direction is always exposed in the storage unit 24. The gravure roll 25 and the pair of backup rollers 23 are arranged in parallel to each other.

  As shown in FIG. 4, the rotating shaft 26 supports the first shaft portion 26 a that supports one end portion 25 a of the gravure roll 25 in the rotating shaft direction and the other end portion 25 b of the gravure roll 25 in the rotating shaft direction. A second shaft portion 26b and a third shaft portion 26c that pivotally supports a central portion 25c in the rotation axis direction of the gravure roll 25 are provided. One end of the third shaft portion 26c is connected to one end of the first shaft portion 26a by the first universal joint 27, and the other end of the third shaft portion 26c is connected to one end of the second shaft portion 26b by the second universal joint 28. It is connected. A universal joint or a ball joint is used for the first and second universal joints 27 and 28.

  The gravure roll 25 is made of hard rubber (for example, nitrile rubber). The gravure roll 25 has a diagonal gravure pattern on the outer peripheral surface. The gravure pattern is configured by a plurality of grooves 29 (see FIG. 3) engraved linearly on the outer peripheral surface of the gravure roll 25. The grooves 29 exist at equal intervals along the circumferential direction of the gravure roll 25. The groove 29 extends obliquely with respect to the axis L of the rotation shaft 26. The groove 29 exists in the entire rotation axis direction of the gravure roll 25, that is, from the outer end surface of the one end portion 25a of the gravure roll 25 to the outer end surface of the other end portion 25b. The groove 29 present at one end 25a of the gravure roll 25 is referred to as a first groove 29a, the groove 29 present at the other end 25b is referred to as a second groove 29b, and the groove 29 present at the center 25c is referred to as a third groove 29c. . The first to third groove portions 29a to 29c are continuous.

  As shown in FIG. 1, when the gravure roll 25 is rotationally driven in the rotation direction Y2, the ceramic slurry 15 in the reservoir 24 adheres to the gravure pattern. That is, the ceramic slurry 15 in the storage unit 24 adheres to the outer peripheral surface of the gravure roll 25 and enters the groove 29. The ceramic slurry 15 attached to the gravure pattern is transported from the storage unit 24 toward the strip electrode 16 by the rotation of the gravure roll 25. At the transfer position P, the ceramic slurry 15 is transferred to the surface of the active material layer 12 by the ceramic slurry 15 coming into contact with the surface of the active material layer 12 in the strip electrode 16 transported in the transport direction X1. As a result, a coating portion 18 of the ceramic slurry 15 is formed on the strip electrode 16.

  As shown in FIG. 4, one end portion 18 a in the width direction X <b> 2 of the coating portion 18 is a portion formed in a portion of the strip electrode 16 that faces the one end portion 25 a of the gravure roll 25. The other end portion 18 b in the width direction X <b> 2 of the coating portion 18 is a portion formed in a portion facing the other end portion 25 b of the gravure roll 25 in the strip electrode 16. A central portion 18 c in the width direction X <b> 2 of the coating portion 18 is a portion formed in a portion of the strip electrode 16 that faces the central portion 25 c of the gravure roll 25.

  The gravure roll 25 is rotationally driven by a first motor 31 connected to the other end of the first shaft portion 26a and a second motor 32 connected to the other end of the second shaft portion 26b. A controller 33 is connected to the first motor 31 and the second motor 32. The control unit 33 individually controls the driving of the first motor 31 and the second motor 32. An inspection device 40 for inspecting the thickness of the formed coating unit 18 is connected to the control unit 33.

The inspection device 40 includes a measurement unit 41, a calculation unit 42, and a determination unit 43.
The measurement unit 41 includes a first measurement unit 41a that measures the thickness H1 of the one end portion 18a in the width direction X2 of the coating portion 18 formed on the strip electrode 16, and a second measurement that measures the thickness H2 of the other end portion 18b. Part 41b.

  The calculation unit 42 calculates the differences H3 and H4 between the thicknesses H1 and H2 of the coating unit 18 measured by the measurement unit 41 and the specified thickness H0. The computing unit 42 includes a first computing unit 42a that is signal-connected to the first measuring unit 41a, and a second computing unit 42b that is signal-connected to the second measuring unit 41b. The first calculation unit 42a transmits the difference H3 between the thickness H1 of the one end 18a in the width direction X2 of the coating unit 18 and the specified thickness H0 obtained by the calculation to the determination unit 43. Similarly, the second calculation unit 42b transmits to the determination unit 43 the difference H4 between the thickness H2 of the other end 18b in the width direction X2 of the coating unit 18 and the specified thickness H0 obtained by the calculation.

  The determination unit 43 determines pass / fail of the thicknesses H1 and H2 of the coating unit 18 based on the differences H3 and H4 between the thicknesses H1 and H2 of the coating unit 18 calculated by the calculation unit 42 and the specified thickness H0. The determination unit 43 includes a first determination unit 43a that receives the difference H3 from the first calculation unit 42a, and a second determination unit 43b that receives the difference H4 from the second calculation unit 42b. When the difference H3 is smaller than the predetermined difference, the first determination unit 43a determines that the thickness H1 of the one end portion 18a in the width direction X2 of the coating unit 18 is good. On the other hand, when the difference H3 is equal to or larger than the predetermined difference, the first determination unit 43a sets the thickness H1 of the one end 18a to be defective, and transmits the difference H3 to the control unit 33. Similarly, the second determination unit 43b determines that the thickness H2 of the other end portion 18b in the width direction X2 of the coating unit 18 is good when the difference H4 is smaller than a predetermined difference. On the other hand, when the difference H4 is greater than or equal to the predetermined difference, the second determination unit 43b sets the thickness H1 of the other end 18b to be defective and transmits the difference H4 to the control unit 33.

  By the way, the thickness of the coating part 18 is set to a thickness in consideration of the relationship with the case in which the electrode assembly is accommodated while ensuring the thickness that functions as the protective layer 19 after drying. Then, the number and shape of the gravure patterns formed on the surface of the gravure roll 25 and the rotation speed of the gravure roll 25 are adjusted so that the thickness of the coating part 18 becomes a set thickness. However, even if the thickness H3 of the central portion 18c of the coating portion 18 is formed to the set thickness, the thickness H1 of the one end portion 18a and the thickness H2 of the other end portion 18b of the coating portion 18 are caused by surface tension. It may be thicker than the thickness H3 of the central portion 18c. And if it continues coating with the one end part 18a and the other end part 18b becoming thick, thickness will differ in the whole product. For this reason, it is necessary to adjust the thickness of the coating part 18 in the middle of coating. Hereinafter, as an example of a method of adjusting the thicknesses H1 and H2 of the one end portion 18a and the other end portion 18b in the width direction X2 of the coating portion 18, the one end portion 18a and the other end portion 18b in the width direction X2 of the coating portion 18 A method of reducing the thicknesses H1 and H2 will be described together with the operation.

  During conveyance of the strip electrode 16, the measurement unit 41 of the inspection device 40 measures the thicknesses H1 and H2 of the one end 18a and the other end 18b of the coating unit 18. The calculation unit 42 calculates the differences H3 and H4 between the measured thicknesses H1 and H2 of the one end 18a and the other end 18b and the specified thickness H0, and the determination unit 43 determines one end from the calculated differences H3 and H4. The quality of the thicknesses H1 and H2 of the part 18a and the other end part 18b is determined. When it is determined that the thicknesses H1 and H2 of the one end 18a and the other end 18b of the coating unit 18 are good, the control unit 33 does not adjust the thicknesses H1 and H2.

  As shown in FIG. 5A, in the gravure roll 25 when the thickness of the coating part 18 is not adjusted, in each groove 29, the first groove part 29a, the second groove part 29b, and the third groove part 29c are on the same straight line. Located in. The inclination angle α1 of the first groove 29a with respect to the axis L of the rotation shaft 26, the inclination angle α2 of the second groove 29b with respect to the axis L of the rotation shaft 26, and the inclination angle α3 of the third groove 29c with respect to the axis L of the rotation shaft 26 Are the same angle. However, when the gravure roll 25 is rotated with the same inclination angles α1 to α3 of the first to third groove portions 29a to 29c and the ceramic slurry 15 is transferred to the strip electrode 16, the width direction of the coating portion 18 as described above. The thicknesses H1 and H2 of the one end portion 18a and the other end portion 18b of X2 may be thicker than the thickness H3 of the central portion 18c. And if thickness H1, H2 of the one end part 18a and the other end part 18b of the coating part 18 is determined to be bad by the determination part 43, the control part 33 will use the above differences H3, H4 to apply the coating part. The thickness of 18 is adjusted.

  As illustrated in FIG. 5B, when adjusting the thicknesses H <b> 1 and H <b> 2 of the one end 18 a and the other end 18 b in the width direction X <b> 2 of the coating unit 18, the control unit 33 determines the rotational speed of the first motor 31. The rotational speed of the second motor 32 is made different. In the present embodiment, the rotational speed of the first motor 31 is made faster than the rotational speed of the second motor 32. Then, the 1st axial part 26a is twisted in the circumferential direction with respect to the 3rd axial part 26c, and the rotation angle of the one end part 25a of the gravure roll 25 becomes an advance angle with respect to the rotation angle of the center part 25c. Further, the second shaft portion 26b is twisted in the circumferential direction with respect to the third shaft portion 26c, and the rotation angle of the other end portion 25b of the gravure roll 25 is retarded with respect to the rotation angle of the central portion 25c. At this time, the inclination angle β3 of the third groove 29c with respect to the axis L of the rotation shaft 26 is the same as the inclination angle α3 before adjustment. On the other hand, the inclination angle β1 of the first groove 29a and the inclination angle β2 of the second groove 29b with respect to the axis L of the rotation shaft 26 are larger than the inclination angle β3. The 1st and 2nd groove parts 29a and 29b will be in the state extended in the perpendicular direction rather than the 3rd groove part 29c.

  As described above, when the gravure roll 25 is rotated with the inclination angles β1 and β2 of the first and second groove portions 29a and 29b larger than the inclination angle β3 of the third groove portion 29c, the ceramic slurry 15 entering the groove 29 The ceramic slurry 15 entering the first groove portion 29a and the second groove portion 29b is more likely to flow down to the storage portion 24 side by gravity than the ceramic slurry 15 entering the third groove portion 29c. For this reason, the amount of the ceramic slurry 15 that can be transferred to the belt-like electrode 16 is smaller at the one end portion 25a and the other end portion 25b of the gravure roll 25 than at the central portion 25c. Therefore, the thicknesses H1 and H2 of the one end portion 18a and the other end portion 18b in the width direction X2 of the coating portion 18 formed after the adjustment are thinner than before the adjustment. The amount of ceramic slurry 15 transferred before adjustment and the amount of ceramic slurry 15 transferred after adjustment become larger as the rotation angle of one end 25a and the other end 25b with respect to the rotation angle of the central portion 25c of the gravure roll 25 is greatly shifted. The difference in quantity also increases.

Next, characteristic effects of the present embodiment will be described.
(1) By changing the rotation angle of the one end 25a and the other end 25b of the gravure roll 25 with respect to the rotation angle of the center 25c by the control unit 33, the one end 25a and the other end 25b are changed to the center 25c. Can be twisted in the circumferential direction. Therefore, the amount of the ceramic slurry 15 transferred to the portion facing the one end portion 25a and the other end portion 25b in the strip electrode 16 can be adjusted during coating.

  (2) One end of the third shaft portion 26 c of the rotating shaft 26 is connected to one end of the first shaft portion 26 a by the first universal joint 27, and the other end of the third shaft portion 26 c is connected to the second universal joint 28 by the second universal joint 28. It is connected to one end of the biaxial portion 26b. The first universal joint 27 can smoothly change the rotation angle of the one end portion 25a of the gravure roll 25 with respect to the rotation angle of the central portion 25c. Similarly, the rotation angle of the other end portion 25b can be changed smoothly with respect to the rotation angle of the central portion 25c by the second universal joint 28.

  (3) The control unit 33 of the gravure coating apparatus 20 controls the first motor 31 connected to the first shaft portion 26a of the rotating shaft 26 and the second motor 32 connected to the second shaft portion 26b. Therefore, the control unit 33 controls the first motor 31 and the second motor 32 so that the rotation speed of the first shaft portion 26a and the rotation speed of the second shaft portion 26b are different, and thus the one end portion 25a of the gravure roll 25 and The rotation angle of the other end portion 25b can be changed with respect to the rotation angle of the central portion 25c.

  (4) The control unit 33 includes the first motor 31 and the second motor 32 based on the thicknesses H1 and H2 of the one end portion 18a and the other end portion 18b in the width direction X2 of the coating portion 18 formed on the strip electrode 16. The rotation speed of can be changed.

In addition, you may change the said embodiment as follows.
The current collector is not limited to the long metal foil 11a as long as the active material layer 12 can be formed. For example, a woven or net-like sheet may be used.

  The gravure coating apparatus 20 is embodied to transfer the ceramic slurry 15 to the active material layer 12 of the strip electrode 16 for manufacturing the electrode 10, but is not limited thereto. The gravure coating apparatus 20 may be employed when an active material, an adhesive, or the like is used as a paint and transferred to a base sheet.

  ○ The transfer of the ceramic slurry 15 is continuous coating performed continuously in the longitudinal direction of the strip electrode 16, but the rotation of the gravure roll 25 is intermittently stopped to move the ceramic slurry 15 in the longitudinal direction of the strip electrode 16. It is good also as the intermittent coating which apply | coats at intervals.

  The electrode 10 may have the active material layer 12 and the protective layer 19 only on one side of the metal foil 11. In this case, the active material layer 12 is provided only on one surface of the belt-like electrode 16, and the coating portion 18 of the ceramic slurry 15 is formed on the active material layer 12.

  The protective layer 19 may be provided on the surface of the active material layer 12 in the positive electrode 10, or may be provided on the surface of the active material layer 12 in both the negative electrode and the positive electrode 10.

  (Circle) the material which comprises the gravure roll 25 is not limited to a nitrile rubber. Rubber hardness measured by a method using a "durometer" based on the new JIS standard (JIS K6253-3: 2012 vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 3: Durometer hardness) Can be used if it has a durometer hardness of 60-90. If the durometer hardness is less than 60, the outer peripheral surface of the gravure roll 25 may be worn by the hard ceramic particles in the ceramic slurry 15 by repeatedly performing the coating process. When the outer peripheral surface is worn, the amount of the ceramic slurry 15 entering the groove 29 decreases, and the amount of the ceramic slurry 15 transferred to the strip electrode 16 (thickness of the coating portion 18) becomes smaller (thinner) than before the wear. There is a fear. When the durometer hardness exceeds 90, the one end 25a and the other end 25b of the gravure roll 25 are twisted to the central portion 25c and change to the inclination angle of the third groove 29c with respect to the axis L of the rotating shaft 26. There is a risk of it. It is more preferable to use a rubber having a durometer hardness of 80 to 90. Examples of rubbers other than nitrile rubber include styrene butadiene rubber and silicon rubber.

  The material constituting the gravure roll 25 is not limited to rubber. The gravure roll 25 should just be comprised from the material whose Young's modulus is 30 GPa-60GPa and elongation rate (elastic elongation rate) is 2.2-2.6%. As this type of material, for example, there is rubber metal (registered trademark), which is a kind of superelastic-plastic titanium alloy.

The groove 29 of the gravure roll 25 may be a groove extending in parallel with the axis L of the rotation shaft 26.
In the above embodiment, the rotation angle of both the one end portion 25a and the other end portion 25b of the gravure roll 25 is changed with respect to the rotation angle of the central portion 25c, but either one of the one end portion 25a and the other end portion 25b is used. May be changed with respect to the rotation angle of the central portion 25c. For example, when the rotation angle of only the one end portion 25a is changed with respect to the rotation angle of the central portion 25c, the rotation speed of the one end portion 25a is different from the rotation speed of the central portion 25c, and the rotation speed of the other end portion 25b is It becomes equal to the rotational speed of the central portion 25c. At this time, a third motor (not shown) is connected to the central portion 25c, and the control unit 33 controls the rotation speeds of the second motor 32 and the third motor to be equal.

  In the above embodiment, the method of reducing the amount of the ceramic slurry 15 transferred to the portion of the belt-like electrode 16 facing the one end portion 25a and the other end portion 25b is shown, but it may be increased as follows. .

  The rotation angle of the one end portion 25a of the gravure roll 25 is retarded with respect to the rotation angle of the central portion 25c, and the inclination angle β1 of the first groove portion 29a with respect to the axis L of the rotation shaft 26 is set to be smaller than the inclination angle β3 of the third groove portion 29c. Also make it smaller. The rotation angle of the other end portion 25b of the gravure roll 25 is set to an advance angle with respect to the rotation angle of the central portion 25c, and the inclination angle β2 of the second groove portion 29b with respect to the axis L of the rotation shaft 26 is set to the inclination angle β3 of the third groove portion 29c. Smaller than. In this case, the ceramic slurry 15 entering the first groove portion 29a and the second groove portion 29b is less likely to flow down due to gravity than the ceramic slurry 15 entering the third groove portion 29c. Therefore, the amount of the ceramic slurry 15 transferred to a portion of the strip electrode 16 facing the one end portion 25a and the other end portion 25b of the gravure roll 25 is increased, and the one end portion 18a and the other end of the coating portion 18 in the width direction X2 are increased. The thicknesses H1 and H2 of the part 18b are increased.

  In the above embodiment, there are two motors for rotating the rotating shaft 26, the first motor 31 and the second motor 32, but one motor may be used. For example, a motor is directly connected to the first shaft portion 26a of the rotary shaft 26, and a motor connected to the first shaft portion 26a is connected to the second shaft portion 26b via a gear. By making the rotation speed of the first shaft portion 26a and the rotation speed of the second shaft portion 26b different by the gear, the rotation angle of the one end portion 25a and the other end portion 25b of the gravure roll 25 is set with respect to the rotation angle of the central portion 25c. Can change.

If the entire rotation axis direction of the gravure roll 25 can rotate integrally with the rotation shaft 26, the first universal joint 27 and the second universal joint 28 may be omitted.
The gravure coating device 20 may not include the inspection device 40.

  In the transfer position P of the ceramic slurry 15, the strip electrode 16 may be conveyed so as to extend in the vertical direction. In this case, it is preferable that the gravure roll 25 and the storage part 24 are arranged on the side of the strip electrode 16.

  The gravure coating apparatus 20 may be employed for manufacturing electrodes used in power storage devices such as nickel hydride secondary batteries and electric double layer capacitors.

DESCRIPTION OF SYMBOLS 15 ... Ceramic slurry as a coating material, 16 ... Strip | belt-shaped electrode as a base material sheet, 20 ... Gravure coating apparatus, 24 ... Storage part, 25 ... Gravure roll, 25a ... One end part, 25b ... Other end part, 25c ... Center part , 26 ... Rotating shaft, 26a ... First shaft portion, 26b ... Second shaft portion, 26c ... Third shaft portion, 27 ... First universal joint, 28 ... Second universal joint, 29 ... Groove, 31 ... First motor 32 ... second motor 33 ... control unit.

Claims (5)

A paint reservoir,
In order to transfer the paint stored in the storage unit to the substrate sheet to be conveyed, the gravure roll to which the coating material of the storage unit is attached to the outer peripheral surface and can rotate integrally with the rotation shaft,
A gravure coating device comprising:
On the outer peripheral surface of the gravure roll, a groove extending obliquely with respect to the rotation axis direction or the rotation axis direction exists from one end portion to the other end portion in the rotation axis direction of the gravure roll,
A gravure coating apparatus comprising: a control unit configured to change a rotation angle of at least one of the one end part and the other end part with respect to a rotation angle of a central part in a rotation axis direction of the gravure roll. The rotating shaft includes a first shaft portion that pivotally supports the one end portion, a second shaft portion that pivotally supports the other end portion, and a third shaft portion that pivotally supports the central portion,
The gravure coating according to claim 1, wherein one end of the third shaft portion is connected to the first shaft portion by a first universal joint, and the other end is connected to the second shaft portion by a second universal joint. apparatus. A first motor that rotationally drives the first shaft portion of the rotating shaft, and a second motor that rotationally drives the second shaft portion of the rotating shaft,
The gravure coating apparatus according to claim 2, wherein the control unit can individually control driving of the first motor and the second motor.   The gravure coating apparatus according to claim 3, wherein the control unit controls driving of the first motor and the second motor based on a thickness of the paint transferred to the base sheet. The gravure roll according to any one of claims 1 to 4, wherein the gravure roll is a hard rubber having a durometer hardness of 60 to 90.