JP2022155714A - Coating applicator - Google Patents

Abstract

To provide a coating applicator that can be reduced in costs required in measuring a state of a coated film more in comparison with a conventional coating applicator.SOLUTION: A coating applicator, which can measure a state of a coated film formed by an applying part that applies coating liquid, comprises: a coating sheet formed annularly; a plurality of circulating rolls that circulate the coating sheet at a predetermined speed; a first applying part that applies coating liquid to a predetermined surface of the coating sheet being circulated by the plurality of circulating rolls to form a coated film; first coated film measuring means that measures a state of the coated film formed on the predetermined surface of the coating sheet by the first applying part; and first coated film removing means that removes the coated film from the predetermined surface of the coating sheet until the coated film measured by the first coated film measuring means reaches the first applying part again, which is configured so that the first applying part, the first coated film measuring means and the first coated film removing means consecutively operate to the coating sheet being circulated.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a coating device for measuring the state of a coating film formed by a coating portion that applies a coating liquid.

Conventionally, a battery electrode plate for a lithium-ion battery is coated with an active material, a binder, and a conductive additive on a substrate that is transported by roll-to-roll by using a coating device equipped with a die for coating electrode material slurry. , and a solvent (hereinafter referred to as coating liquid) to form a coating film.

The precision with which the coating liquid is applied by the coating device directly affects the quality of the battery plate of the lithium ion battery. Specifically, when the application accuracy of the coating liquid by the coating device is poor, the state of the coating film is adversely affected, for example, the thickness of the coating film formed varies. In the manufacture of lithium-ion battery electrode plates (hereinafter referred to as products), the state of the coating film directly affects the amount of charge and discharge of the product, so control of coating accuracy is important.

In order to improve the coating accuracy, it is necessary to optimize the coating conditions (for example, the flow rate of the coating liquid to be applied). Therefore, it has been desired to evaluate the coating conditions and grasp the optimum coating conditions before actually manufacturing the product. This can be done by forming a coating film under the same coating conditions as when actually manufacturing a product, and measuring the state of the formed coating film. On the other hand, a coating device used when actually manufacturing a product is provided with a coating film measuring means for measuring the state of the coating film (hereinafter referred to as a coating device), and the coating liquid is applied and the coating It has been proposed to measure the state of the coating film formed by the liquid.

As shown in FIG. 6, the coating device 920 includes an unwinding roll 921 for unwinding a substrate 930, a die 922 for applying a coating liquid to form a coating film, and a state of the coating film formed by the die 922. , a drying section 923 for drying the coating liquid, and a winding roll 924 for winding the substrate 930 . The base material 930 is unwound by the unwinding roll 921 of the coating device 920, and the base material 930 is conveyed downstream in the conveying direction. to form At this time, the coating film is formed on the substrate 930 under the same coating conditions as those used when actually manufacturing the product. Then, the state of the coating film formed on the transported substrate 930 is measured by the coating film measuring means 910 . After that, the coating film is dried by the drying section 923 and the substrate 930 is wound on the winding roll 924 . This makes it possible to measure the state of the coating film (for example, Patent Document 1 below).

JP 2016-033884 A

However, the coating device 920 has a problem that the cost for measuring the state of the coating film increases.

A specific description will be given. In the coating device 920, in order to evaluate whether or not the coating conditions are optimum, a coating film is formed under the same coating conditions as those used when actually manufacturing a product. That is, in order to measure the state of the coating film using the coating device 920, it is necessary to consume the materials (eg, the base material 930 and the coating liquid) used in the actual manufacture of the product. Naturally, the coating film formed during the measurement of the state of the coating film cannot be used as a product, so the cost for the measurement increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating apparatus capable of reducing the cost of measuring the state of a coating film as compared with the prior art.

A coating device according to the present invention for solving the above problems is a coating device for measuring the state of a coating film formed by a coating portion that applies a coating liquid, comprising a coating sheet formed in a ring shape, and the coating sheet a plurality of circulation rolls that circulate at a predetermined speed; a first coating section that applies a coating liquid to a predetermined surface of the coating sheet circulating by the plurality of circulation rolls to form a coating film; a first coating film measuring means for measuring the state of the coating film formed on the predetermined surface of the coating sheet by one coating portion; and a first coating film removing means for removing the coating film from the predetermined surface of the coating sheet before reaching the first coating portion, wherein the first coating portion and the first and the first coating film removing means operate with respect to the continuously circulating coating sheet.

According to the coating apparatus, the coating film is formed on the predetermined surface of the coating sheet by the first coating unit, the state of the formed coating film is measured by the first coating film measuring means, and the measured coating film is measured. The film is removed from the predetermined surface of the coated sheet by the first coating film removing means. Since these operations are performed on the coating sheet which is continuously circulated at a predetermined speed by a plurality of circulation rolls, the surface of the coating sheet on which the coating liquid does not adhere can be obtained without consuming the base material. The formation of the coating film and the measurement of the state of the coating film can be continuously performed many times. Therefore, the cost can be reduced as compared with the conventional method in which the state of the coating film is measured by consuming the base material.

Further, the ejection port for applying the coating liquid of the first coating section may be arranged so as to face any one of the plurality of circulation rolls with the coating sheet interposed therebetween.

According to this configuration, the first coating section applies the coating liquid to the coating sheet supported by the circulation rolls. As a result, the first application section can apply the application liquid to the predetermined surface of the application sheet while maintaining a constant distance between the ejection port of the first application section and the application sheet.

The coating liquid recycling means recovers the coating liquid forming the coating film removed by the first coating film removing means, and re-applies the recovered coating liquid by the first coating unit. It is also possible to adopt a configuration in which

According to this configuration, the coating liquid applied by the first coating section can be reused. Therefore, the consumption of the coating liquid can be suppressed, and the cost can be further reduced.

Further, the first coating film removing means is formed in a thin plate shape, and the end portion of the first coating film removing means is pressed against the predetermined surface of the coating sheet, thereby removing the coating sheet. A configuration may be adopted in which the coating film is removed by scraping from a predetermined surface.

According to this configuration, it is possible to remove the coating film from the predetermined surface of the coating sheet without requiring a complicated mechanism.

Further, the coating sheet is arranged to face the first coating film removing means with the coating sheet interposed therebetween, and by supporting the coating sheet from the back surface of the predetermined surface of the coating sheet, the first coating film removing means A configuration having an auxiliary roll for assisting removal of the coating film may be employed.

According to this configuration, when the coating film on the predetermined surface of the coating sheet is removed by the first coating film removing means, the auxiliary roll can support the coating sheet from the back surface of the predetermined surface of the coating sheet. As a result, the coating sheet can be prevented from bending when the coating film is removed from the predetermined surface of the coating sheet by the first coating film removing means, and the coating film can be easily removed.

Moreover, it is good also as a structure which has a circulation roll temperature control means which adjusts the temperature of the said circulation roll.

According to this configuration, the temperature of the application sheet in contact with the circulation rolls can be maintained at a desired temperature by adjusting the temperature of the circulation rolls. Therefore, it is possible to prevent the coating sheet from being heated and deformed by heat such as frictional heat generated when the coating liquid is applied by the first coating unit and when the coating film is removed by the first coating film removing means. Become.

Further, the coating condition adjusting means is provided for reflecting the result obtained by the coating film measuring means in the continuous circulation of the coating sheet and controlling the coating conditions for applying the coating liquid by the first coating section. may be configured.

According to this configuration, it is possible to efficiently improve the application accuracy of the application liquid by the first application unit and maintain the improved application accuracy.

Further, the coating condition adjusting means may have a width direction adjusting portion that adjusts the flow rate of the coating liquid applied by the first coating portion across the width direction of the first coating portion.

According to this configuration, it is possible to adjust the flow rate of the coating liquid applied by the first coating portion across the width direction of the first coating portion.

Further, the first application unit may be configured as a die for applying a slurry of an electrode material in order to manufacture a battery electrode plate.

According to this configuration, the state of the applied coating liquid can be measured by the die, and based on the measurement results, the coating conditions for forming a coating film that allows the battery to obtain a predetermined charge-discharge performance can be determined. can be guided.

a second coating unit that applies a coating liquid to the back surface of the predetermined surface of the circulating coating sheet to form the coating film; a second coating film measuring means for measuring the state of the formed coating film; and the coating film measured by the second coating film measuring means before reaching the second coating portion again and a second coating film removing means for removing the film from the back surface of the predetermined surface of the coating sheet.

According to this configuration, the coating film can be formed on the reverse side of the predetermined surface of the coating sheet by the second coating section, and the state of the formed coating film can be measured by the second coating film measuring means. That is, it is possible to form and measure coating films on both the outer peripheral surface and the inner peripheral surface of the coating sheet. As a result, even if the actual product is manufactured by forming coating films on both sides of the substrate, it is possible to measure the state of the coating film accordingly. Further, since the coating film measured by the second coating film measuring means is removed from the reverse side of the predetermined surface of the coating sheet by the second coating film removing means, the coating liquid adheres to the coating sheet without consuming the base material. Formation of a coating film on a surface free from contamination and measurement of the state of the coating film can be continuously performed many times. Therefore, the cost can be reduced as compared with the conventional method in which the state of the coating film is measured by consuming the base material.

Further, each of the first coating film removing means and the second coating film removing means has the coating film formed on both surfaces of the coating sheet, and the first coating film measuring means and the second coating film measuring means have the coating film formed on both sides of the coating sheet. After being measured by the film measuring means, the coating film may be removed from the coating sheet before reaching the first coating portion or the second coating portion, whichever comes first.

According to this configuration, the state of the coating film formed on the inner peripheral surface of the coating sheet can be measured in a state where the coating film is formed on both surfaces of the coating sheet. As a result, the influence of the weight of the coating film formed on the outer peripheral surface of the coating sheet, the coating distribution, and the coating width, and the speed at which the coating sheet circulates due to the formation of the coating film on the outer peripheral surface of the coating sheet and the coating It is possible to measure the state of the coating film formed on the inner peripheral surface of the coating sheet under the influence of the change in tension of the sheet. That is, it is possible to measure the state of the coating films on both sides of the coating sheet formed under conditions close to those of the actual manufacture of the electrode plate for a battery.

According to the coating apparatus of the present invention, it is possible to reduce the cost required for measuring the state of the coating film as compared with the conventional one.

It is a figure which shows roughly the coating device in 1st embodiment of this invention. It is a figure which shows the 1st coating film removal means and the 2nd coating film removal means in 1st embodiment of this invention. FIG. 2 is a view taken along the line AA in FIG. 1; It is a figure which shows the variation of the coating mechanism in 1st embodiment of this invention. It is a figure which shows the variation of the coating device in 1st embodiment of this invention. It is a schematic diagram showing a conventional coating device.

[First embodiment]
A coating device according to a first embodiment of the present invention will be described with reference to the drawings. In the following description, the three axes of the orthogonal coordinate system are X, Y, and Z, the horizontal direction is expressed as the X-axis direction and the Y-axis direction, and the direction perpendicular to the XY plane (that is, the vertical direction) is the Z-axis. expressed as direction.

Drawing 1 is a figure showing roughly coating device 1 in a first embodiment. FIG. 2 is a diagram showing the first coating film removing means 23 and the second coating film removing means 33 in the first embodiment. 3 is a view taken along line AA of FIG. 1. FIG. FIG. 4 is a diagram showing variations of the first coating mechanism 21 and the second coating mechanism 31 in the first embodiment.

As shown in FIG. 1, the coating apparatus 1 of this embodiment includes a coating sheet S formed in a ring shape, a plurality of circulation rolls 11 for circulating the coating sheet S, and a coating sheet S circulated by the plurality of circulation rolls 11. A coating liquid E (see FIG. 2) is applied to a predetermined surface to form a coating film T, and a first coating film measuring mechanism 2 for measuring the state of the coating film T; A coating liquid E is applied to form a coating film T, and a second coating film measuring mechanism 3 for measuring the state of the coating film T is provided. The predetermined surface of the coating sheet S in this embodiment is the outer peripheral surface of the coating sheet S, and the back surface of the predetermined surface of the coating sheet S is the inner peripheral surface of the coating sheet S. Hereinafter, the predetermined surface of the coating sheet S is called the outer peripheral surface of the coating sheet S, and the back surface of the predetermined surface of the coating sheet S is called the inner peripheral surface of the coating sheet S.

The coating apparatus 1 measures the state of the coating film T formed by coating the coating liquid E on both sides of the coating sheet S under arbitrary coating conditions. Based on this measurement result, it is possible to evaluate whether or not the arbitrary coating conditions are optimal.

The coating liquid E in the present embodiment is, for example, a slurry containing an active material, a binder, a conductive aid, and a solvent, and is a material (so-called electrode material) of a battery electrode plate (hereinafter referred to as a product) of a lithium ion battery. ).

Further, the coating conditions in the present embodiment are the conditions set for controlling the operation of each part constituting the coating apparatus 1 to apply the coating liquid E. have a direct impact. The application condition here means, for example, the flow rate of the application liquid E applied by the first application mechanism 21 and the second application mechanism 31, which will be described later. The state of the coating film T here means, for example, the thickness and width of the coating film T. Based on the state of the coating film T, it is evaluated whether or not the coating conditions are optimal.

The coating sheet S in this embodiment is a looped sheet, as shown in FIG. 1, and is circulated by a plurality of circulation rolls 11, which will be described later. The coating sheet S may be made of, for example, SUS (rolled stainless steel). Note that the material and dimensions of the coating sheet S can be appropriately changed depending on the application.

The plurality of circulating rolls 11 in this embodiment are for circulating the coating sheet S at a predetermined speed. The circulation roll 11 is formed in a columnar shape, and rotates about the central axis of the column. Some or all of the plurality of circulation rolls 11 are driven and controlled to rotate by a control unit (not shown) to continuously circulate the coating sheet S at a predetermined speed. The control unit is composed of, for example, a general-purpose computer device, and controls the rotation of the circulation rolls 11 so as to achieve a set circulation speed. The circulation speed of the coating sheet S by the circulation rolls 11 is preferably the same speed (for example, 100 m/min or more) as the transport speed of the base material transported when actually manufacturing the product.

Also, the arrangement of each of the plurality of circulation rolls 11 in this embodiment will be described with reference to FIG. Any one of the plurality of circulation rolls 11 is arranged so as to face the first coating section 21a of the first coating film measuring mechanism 2, which will be described later, with the coating sheet S interposed therebetween. The other circulating rolls 11 are arranged to apply a predetermined tension to the coating sheet S, and as shown in FIG. Arranged to form a route.

A specific description will be given. The plurality of circulation rolls 11 in this embodiment are a circulation roll 11a, a circulation roll 11b, a circulation roll 11c, a circulation roll 11d, and a circulation roll 11e, as shown in FIG. in contact with The circulation roll 11a and the circulation roll 11b are arranged so that the first coating film measuring mechanism 2 is positioned between the circulation roll 11a and the circulation roll 11b, and the first coating section 21a is positioned to face the circulation roll 11a. . The circulation rolls 11c are arranged so that the second coating film measuring mechanism 3 is positioned between the circulation rolls 11b and 11c. The circulation roll 11d and the circulation roll 11e are arranged at positions where the coating sheet S can be circulated from the circulation roll 11a to the circulation roll 11a via the circulation rolls 11b and 11c. Further, each circulation roll 11 is arranged at a position such that the embrace angle of each circulation roll 11 is such that a predetermined tension can be applied to the coating sheet S. As shown in FIG. That is, the plurality of circulation rolls 11 circulate the coating sheet S from the circulation roll 11a through the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 while applying a predetermined tension to the coating sheet S. It can be circulated to the roll 11a.

The first coating film measuring mechanism 2 in this embodiment will be described below.

The first coating film measuring mechanism 1 in this embodiment forms a coating film T by applying a coating liquid E to the outer peripheral surface of a circulating coating sheet S, and measures the state of the coating film T. be. The first coating film measuring mechanism 2 includes, as shown in FIG. and a first coating film removing means 23 for removing the coating film T from the outer peripheral surface of the coating sheet S.

The first coating mechanism 21 in this embodiment is for forming the coating film T by coating the coating liquid E on the outer peripheral surface of the coating sheet S continuously circulating at a predetermined speed. As shown in FIG. 1, the first coating mechanism 21 is composed of a first coating section 21a for coating the coating liquid E and coating liquid supply means 4 for supplying the coating liquid E to the first coating section 21a. . The operation of each part that constitutes the first coating mechanism 21 is controlled based on the coating conditions for the coating liquid E that have been set. Note that the control of the operation of each part that constitutes the first coating mechanism 21 may be performed by the control part described above.

The first application part 21a is for applying the application liquid E. As shown in FIG. In the present embodiment, an example in which the first application part 21a is a die for applying slurry of an electrode material will be described. Note that the first coating unit 21a is not limited to a die, and may be compatible with, for example, an inkjet coating method or a gravure coating method. Note that the second application portion 31a, which will be described later, is treated in the same way.

The first application portion 21a is formed long along the width direction of the application sheet S (the Y-axis direction in FIG. 1). Here, the rotation axis direction of the circulation roll 11a and the width direction of the first coating portion 21a (the Y-axis direction in FIG. 1) of the circulation roll 11a are parallel to the first coating portion 21a. are arranged at predetermined intervals.

1 and 3, the first coating portion 21a is connected to the coating liquid supply means 4, and is connected to a manifold 51, which is a space for storing the coating liquid E long in the width direction, and the manifold 51. It is composed of a slit 52 that is wide in the width direction and a discharge port 53 that has the same length as the slit 52 in the width direction and discharges the coating liquid E. As shown in FIG. As a result, the coating liquid E stored in the manifold 51 is discharged onto the outer peripheral surface of the coating sheet S from the discharge port 53 via the slit 52 . Further, the discharge port 53 faces the circulation roll 11a with the coating sheet S interposed therebetween. That is, the ejection port 53 faces the coating sheet S on the outer peripheral surface side of the coating sheet S. As shown in FIG. As a result, the coating liquid E can be applied to the outer peripheral surface of the coating sheet S while the gap between the ejection port 53 and the coating sheet S is kept constant.

The coating liquid supply means 4 is for supplying the coating liquid E to the first coating section 21a. As shown in FIG. 1, the coating liquid supply means 4 includes a supply tank 41 for storing the coating liquid E, a supply channel 42 connecting the supply tank 41 and the manifold 51, and a supply channel 42 for supplying the coating liquid E from the supply tank 41 to the manifold. It is composed of a pump 43 that feeds liquid to 51 . As a result, the application liquid E stored in the supply tank 41 is sent through the supply channel 42 by the pump 43 and supplied to the manifold 51 .

With these configurations, the first coating mechanism 21 can apply the coating liquid E in a band shape to the outer peripheral surface of the coating sheet S continuously circulating at a predetermined speed to form the coating film T. FIG.

The first coating film measuring means 22 measures the state of the coating film T formed on the outer peripheral surface of the coating sheet S continuously circulating at a predetermined speed by the first coating mechanism 21 . The coating film measuring means 22 in the present embodiment includes a film thickness measuring means 61 (for example, a displacement meter) for measuring the thickness of the coating film T and a width measuring means 62 for measuring the width of the coating film T, as shown in FIG. (for example, an area camera). The operations of these film thickness measuring means 61 and width measuring means 62 may be controlled by the above-described control unit, and by operating these, the thickness and width of the coating film T formed on the outer peripheral surface of the coating sheet S are measured. can be measured.

In this embodiment, the result of measurement by the first coating film measuring means 22 is output to the aforementioned control section. By checking the output measurement result, it is possible to evaluate whether or not the coating conditions by the first coating mechanism 21 are optimal.

The first coating film removing means 23 is for removing the coating film T measured by the first coating film measuring means 22 from the outer peripheral surface of the coating sheet S. As shown in FIG. is positioned between the first coating film measuring means 22 and the first coating portion 21a in the direction of circulation. That is, the coating film T is removed from the outer peripheral surface of the coating sheet S at least until the coating film T measured by the first coating film measuring means 22 reaches the first coating portion 21a again. As shown in FIGS. 1 and 2, the first paint film removing means 23 in the present embodiment comprises a thin blade 71a and a blade holder 72a to which the blade 71a is attached.

The blade 71a is formed long along the width direction of the coating sheet S, and the outer peripheral surface of the coating sheet S is arranged so that the width direction of the blade 71a (the Y-axis direction in FIG. 1) and the width direction of the coating sheet S are parallel to each other. side facing the coating sheet S. By pressing the tip of the blade 71a against the outer peripheral surface of the coating sheet S, the coating film T is scraped off from the outer peripheral surface of the coating sheet S and removed. The blade 71a is made of, for example, PET (polyethylene terephthalate), epoxy resin, high polymer, or the like. Further, the thickness of the blade 71a is such that the blade 71a naturally follows the surface of the coating sheet S when the blade 71a is pressed against the coating sheet S, for example, 0.5 to 1.0 mm. good.

The blade holder 72b is for holding the blade 71a at a predetermined position, and has a structure in which the blade 71a can be freely attached and detached. That is, the material and dimensions of the blade 71a can be freely selected and used according to the application. Further, the blade holder 72a may have a mechanism (not shown) for moving the blade 71a toward and away from the outer peripheral surface of the application sheet S. As shown in FIG. As a result, the degree of pressing of the blade 71a against the outer peripheral surface of the application sheet S can be adjusted to the extent that abrasion of the application sheet S can be suppressed.

Further, an auxiliary roll 73a may be provided for assisting the scraping of the coating film T by the blade 71a of the first coating film removing means 23. As shown in FIG. The auxiliary roll 73a is formed in a columnar shape as shown in FIGS. 1 and 2, and rotates about the central axis of the column. The auxiliary roll 73a is arranged so that the rotation axis direction of the auxiliary roll 73a and the width direction of the blade 71a are parallel, and the coating sheet S is sandwiched between the blade 71a. Therefore, when the coating film T is scraped off from the outer peripheral surface of the coating sheet S by the blade 71a, the coating sheet S can be supported from the inner peripheral surface side of the coating sheet S by the auxiliary roll 73a. As a result, the coating sheet S can be prevented from bending when the coating film T is scraped off by the blade 71a, and the coating film T can be easily scraped off.

As described above, each of the first coating mechanism 21, the first coating film measuring means 22, and the first coating film removing means 23 constituting the first coating film measuring mechanism 2 is controlled by the circulation roll 11 to a predetermined value. It is operated against the outer peripheral surface of the coating sheet S continuously circulating at a high speed. As a result, it is possible to measure the state of the coating film T formed by applying the coating liquid E to a long base material that is continuously conveyed as in the conventional method. Specifically, the first coating film measuring mechanism 2 in this embodiment applies the coating liquid E to the outer peripheral surface of the coating sheet S that circulates at the same speed as the conventional substrate conveying speed, and forms a The state of the coated film T is measured, and the coated film T is removed after the measurement. As a result, without consuming the base material, the coating film T is formed on the surface of the coating sheet S on which the coating liquid E is not adhered, and the state of the formed coating film T is measured continuously any number of times. can be done. Therefore, the cost can be reduced as compared with the conventional method in which the state of the coating film T is measured by consuming the base material.

The second coating film measuring mechanism 3 in this embodiment will be described below. The same reference numerals are assigned to the same components as those of the first coating film measuring mechanism 2, and detailed description thereof will be omitted.

The second coating film measuring mechanism 3 applies the coating liquid E to the inner peripheral surface of the circulating coating sheet S to form the coating film T, and measures the state of the coating film T. As shown in FIG. The second coating film measuring mechanism 3 includes a second coating mechanism 31 for coating the inner peripheral surface of the coating sheet S with the coating liquid E to form the coating film T as shown in FIG. A second coating film measuring means 32 for measuring the state of the coating film T formed on the peripheral surface and a second coating film removing means 33 for removing the coating film T from the inner peripheral surface of the coating sheet S are provided. there is

The second coating mechanism 31 in this embodiment is for coating the coating liquid E on the inner peripheral surface of the coating sheet S continuously circulating at a predetermined speed to form the coating film T. As shown in FIG. The second coating mechanism 31 has, as shown in FIG. It is composed of a coating liquid supplying means 4 for supplying the liquid E. FIG. The operation of each part that constitutes the second coating mechanism 31 is controlled based on the coating conditions for the coating liquid E that have been set. Note that the control of the operation of each part that constitutes the second coating mechanism 31 may be performed by the above-described control part.

The second application part 31a has the same structure as the first application part 21a described above, and the ejection port 53 of the second application part 31a is located on the inner peripheral surface side of the application sheet S. They are arranged facing each other. As a result, the second coating portion 31 a is supplied with the coating liquid E from the coating liquid supply means 4 and coats the inner peripheral surface of the coating sheet S with the supplied coating liquid E. As shown in FIG. That is, the second coating mechanism 31 can apply the coating liquid E in a belt shape to the inner peripheral surface of the coating sheet S continuously circulating at a predetermined speed to form the coating film T. As shown in FIG.

The second coating film measuring means 32 is for measuring the state of the coating film T formed on the inner peripheral surface of the coating sheet S continuously circulated at a predetermined speed by the second coating mechanism 31. . The second coating film measuring means 32 in this embodiment is composed of a film thickness measuring means 61 and a width measuring means 62 for measuring the width of the coating film T, like the first coating film measuring means 22 described above. be done. Thereby, the thickness and width of the coating film T formed on the inner peripheral surface of the coating sheet S can be measured.

In this embodiment, the result of measurement by the second coating film measuring means 32 is output to the aforementioned control section. By checking the output measurement results, it is possible to evaluate whether or not the coating conditions by the second coating mechanism 31 are optimal.

The second coating film removing means 33 is for removing the coating film T measured by the second coating film measuring means 32 from the inner peripheral surface of the coating sheet S. As shown in FIG. It is arranged so as to be positioned between the second coating film measuring means 32 and the second coating portion 31a in the direction in which S circulates. That is, the coating film T is removed from the inner peripheral surface of the coating sheet S at least until the coating film T measured by the second coating film measuring means 32 reaches the second coating portion 31a again. . Further, the second coating film removing means 33 is positioned so that the coating film T formed on the inner peripheral surface of the coating sheet S can be removed from the inner peripheral surface of the coating sheet S before the coating film T formed on the inner peripheral surface of the coating sheet S contacts the circulation roll 11c. should be placed in This can prevent the coating film T from adhering to the circulation roll 11c.

Further, the second coating film removing means 33 and the first coating film removing means 23 described above separate the first coating portion 21a and the second coating portion 21a after the coating film T is formed on both surfaces of the coating sheet S and measured. It is preferable to arrange the coating film T at a position where the coating film T can be removed from the coating sheet before reaching the first one of the coating portions 31a. In this embodiment, the first coating film removing means 23 and the second coating film removing means 33 are arranged in the direction in which the coating sheet S circulates, as shown in FIG. It is arranged so as to be positioned between the application portions 31a. That is, the first coating portion 31a forms the coating film T on the outer peripheral surface of the coating sheet S under the condition that there is no coating film T on either surface of the coating sheet S, and the second coating portion 31b forms the coating film T on the coating sheet S. The coating film T is formed on the inner peripheral surface of the coating sheet S under the condition that the coating film T is formed on the outer peripheral surface. After measuring the state of the coating film T formed on the inner peripheral surface of the coating sheet S by the second coating film measuring means 32, the first coating film removing means 23 and the second coating film removing means 33 The coating film T formed on both surfaces of the coating sheet S is removed. Thereby, the state of the coating film T formed on the inner peripheral surface of the coating sheet S can be measured in a state where the coating film T is formed on both surfaces of the coating sheet S.

The second coating film removing means 33 in this embodiment is composed of a blade 71b and a blade holder 72b, like the first coating film removing means 23 described above. The blade 71b in the second coating film removing means 33 coats on the inner peripheral surface side of the coating sheet S so that its width direction (the Y-axis direction in FIG. 2) and the width direction of the coating sheet S are parallel. It is arranged so as to face the seat S. By pressing the tip of the blade 71b against the inner peripheral surface of the coating sheet S, the coating film T is scraped off from the inner peripheral surface of the coating sheet S and removed.

The blade holder 72b in the second coating film removing means 33 may have a mechanism (not shown) for moving the attached blade 71b toward and away from the inner peripheral surface of the coating sheet S. As shown in FIG. As a result, the degree of pressing of the blade 71b against the inner peripheral surface of the application sheet S can be adjusted to the extent that abrasion of the application sheet S can be suppressed.

Further, an auxiliary roll 73b may be provided in the same manner as the first coating film removing means 23. As shown in FIG. 2, the auxiliary roll 73b is arranged such that the rotation axis direction of the auxiliary roll 73b and the width direction of the blade 71b constituting the second coating film removing means 33 are parallel to each other, and the coating sheet S is moved to the coating film removing means 33. It is arranged so as to be sandwiched with the blade 71b in . Therefore, when the blade 71b of the second coating film removing means 33 scrapes off the coating film T from the inner peripheral surface of the coating sheet S, the auxiliary roll 73b supports the coating sheet S from the inner peripheral surface side of the coating sheet S. be able to. As a result, the coating sheet S can be prevented from bending when the coating film T is scraped off by the blade 71b of the second coating film removing means 33, and the coating film T can be easily scraped off.

Here, when the auxiliary roll 73b is provided, the first coating film removing means 23 applies the coating film T formed on the surface of the coating sheet S by the first coating mechanism 21 before the coating film T contacts the auxiliary roll 73b. Film T is removed. That is, the first coating film removing means 23 is arranged so as to be positioned between the second coating film measuring means 32 and the auxiliary roll 73b in the direction in which the coating sheet S circulates. This can prevent the coating film T from adhering to the auxiliary roll 73b.

As described above, each of the second coating mechanism 31, the second coating film measuring means 32, and the second coating film removing means 33 constituting the second coating film measuring mechanism 3 is controlled by the circulation roll 11 to a predetermined level. It is operated against the inner peripheral surface of the coating sheet S continuously circulating at a high speed. As a result, without consuming the base material, the coating film T is formed on the surface of the coating sheet S on which the coating liquid E is not adhered, and the state of the formed coating film T is measured continuously any number of times. can be done. Therefore, the cost can be reduced as compared with the conventional method in which the state of the coating film T is measured by consuming the base material.

Further, the second coating film measuring means 32 measures the state of the coating film T formed on the inner peripheral surface of the coating sheet S in a state where the coating film T is formed on both surfaces of the coating sheet S. As a result, the influence of the weight of the coating film T formed on the outer peripheral surface of the coating sheet S, the coating distribution, and the coating width, and the coating sheet S caused by the coating film T formed on the outer peripheral surface of the coating sheet S are It is possible to measure the state of the coating film T formed on the inner peripheral surface of the coating sheet S under the influence of changes in the circulation speed and the tension of the coating sheet S. That is, it is possible to measure the state of the coating films on both sides of the coating sheet S formed under conditions close to those of the actual manufacturing of the electrode plate for a battery.

In addition, in the present embodiment, each part constituting each of the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 operates on the coating sheet S that continuously circulates. Thereby, the formation of the coating film T on both the outer peripheral surface and the inner peripheral surface of the coating sheet S and the measurement of the state of the formed coating film T can be continuously performed any number of times. As a result, the cost can be reduced as compared with the conventional method in which the state of the coating film T is measured by consuming the base material. Moreover, even if the actual product is manufactured by forming the coating T on both sides of the base material, it is possible to measure the state of the coating T accordingly.

Further, the first coating mechanism 21 and the second coating mechanism 31 in this embodiment further have coating condition adjusting means. The coating condition adjusting means is for controlling the coating conditions under which the coating liquid E is applied by each of the first coating mechanism 21 and the second coating mechanism 31 . The application condition adjusting means controls the application conditions by adjusting the operation and position of each part of the first application mechanism 21 and the second application mechanism 31 .

The coating condition adjusting means of the first coating mechanism 21 in this embodiment will be described below. The coating condition adjusting means has coating flow rate adjusting means. The coating flow rate adjusting means is for adjusting the flow rate of the coating liquid E applied by the first coating section 21a. This coating flow rate adjusting means is, for example, the pump 43 in this embodiment. By controlling the operation of the pump 43, the flow rate of the coating liquid E supplied to the first coating section 21a is adjusted.

Further, the coating flow rate adjusting means in this embodiment further has a width direction adjusting portion 44 . As shown in FIG. 3, the width direction adjusting portion 44 is composed of a plurality of branched flow paths 44a branched from the supply flow path 42 and valves 44b corresponding to the branched flow paths 44a. Each of these branch flow paths 44a is connected to the manifold 51 of the first application section 21a, and the flow rate of the application liquid E supplied to the manifold 51 from each of these branch flow paths 44a is adjusted by the opening degree of the valve 44b. be. Here, each of the branch flow paths 44a may be arranged at predetermined intervals in the width direction of the manifold 51 . Thereby, the flow rate of the coating liquid E supplied to the manifold 51 can be adjusted across the width direction. That is, the flow rate of the coating liquid E applied by the first coating portion 21a can be adjusted with high accuracy across the width direction.

It should be noted that the width direction adjusting portion 44 is not limited to the branch channel 44a and the valve 44b. For example, as shown in FIG. 4, by extracting the coating liquid E from a plurality of points in the flow path of the coating liquid E in the width direction of the first coating section 21a, the coating liquid E applied by the first coating section 21a is It may be configured to adjust the coating flow rate. In addition, a plurality of bolts are provided in the first application portion 21a, and the thrust force of these bolts is applied to the first application portion 21a, thereby deforming the first application portion 21a and increasing the width of the first application portion 21a. A configuration may be adopted in which the application flow rate of the application liquid E in the direction is adjusted.

Further, the coating condition adjusting means is not limited to having the coating flow rate adjusting means. For example, a mechanism for adjusting the distance between the first application section 21a and the application sheet S may be provided. Thereby, the width of the coating film T formed by the first coating portion 21a can be adjusted.

The coating condition adjusting means of the second coating mechanism 31 in this embodiment has the same configuration as the coating condition adjusting means of the first coating mechanism 21 . Therefore, similarly to the first coating mechanism 21, the coating condition of the second coating mechanism 31 can be adjusted by the coating condition adjusting means.

Here, the coating condition adjusting means in this embodiment, which each of the first coating mechanism 21 and the second coating mechanism 31 has, is the first coating film measuring means 22 and the second coating film measuring means 32 described above. The application conditions are adjusted based on the results measured by each. Specifically, the measurement results of the first coating film measuring means 22 and the second coating film measuring means 32 are confirmed, and the coating conditions by the first coating mechanism 21 and/or the second coating mechanism 31 are If it is not optimal, the operation and position of each part of the first coating mechanism 21 and/or the second coating mechanism 31 are adjusted by the coating condition adjusting means so that the state of the coating film T approaches the desired state. By doing so, the coating conditions are controlled. This makes it possible to optimize the coating conditions. That is, the first coating portion 21a and the second coating portion 31a can form the coating film T under the optimum coating conditions to manufacture the electrode plate for the battery, thereby improving the quality of the battery (for example, charging). It is possible to improve the discharge performance, etc.).

Each of the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 in this embodiment further has a coating liquid recycling means 8 .

The coating liquid recycling means 8 of the first coating film measuring mechanism 2 in this embodiment will be described below. The coating liquid reusing means 8 is for reusing the coating liquid E that forms the coating film T removed by the first coating film removing means 23 . In this embodiment, the coating liquid recycling means 8 includes a recovery tank 81 for recovering the coating liquid E forming the coating film T removed by the first coating film removing means 23 as shown in FIGS. a tray portion 82 for introducing the application liquid E to the recovery tank 81; a reuse flow path 83 connecting the recovery tank 81 and the supply tank 41; It is composed of a pump 84 .

The tray part 82 is formed in a flat plate shape, and is arranged to be inclined from the first coating film removing means 23 toward the recovery tank 81 so as to lead the coating liquid E to the recovery tank 81 as shown in FIGS. ing. As a result, the coating liquid E that forms the coating film T that has been removed by the first coating film removing means 23 can be reliably recovered in the recovery tank 81 . Note that the tray portion 82 may be formed in a substantially U-shaped or substantially V-shaped shape. This can prevent the coating liquid E from scattering.

Then, the coating liquid E that is guided to the recovery tank 81 by the tray part 82 and recovered by the recovery tank 81 is sent by the pump 84 to the supply tank 41 through the reuse channel 83 . Then, the coating liquid E sent to the supply tank 41 is again coated on the coating sheet S by the first coating section 21a. That is, it is possible to reuse the coating liquid E that has been applied once by the first coating unit 21a.

The coating liquid recycling means 8 of the second coating film measuring mechanism 3 in this embodiment has the same configuration as the coating liquid recycling means 8 of the first coating film measuring mechanism 2 . Therefore, the coating liquid E that forms the coating film T that has been removed by the second coating film removing means 33 can be applied again by the second coating part 31a. That is, it is possible to reuse the coating liquid E once applied by the second coating unit 31a.

As described above, according to the coating apparatus 1 of the first embodiment, it is possible to obtain the same measurement result as the conventional measurement of the coating film T without consuming the substrate. Therefore, it is possible to reduce the cost required for the measurement as compared with the conventional method. In addition, since it is not necessary to dry the coating film T applied to the base material and wind up the base material as in the conventional art, the coating speed of the coating liquid E can be increased without considering the time required for drying the coating film T. The state of the coating film T can be measured by increasing the speed at which the coating sheet S circulates. That is, it is possible to form the coating film T at a speed exceeding the product production speed of the conventional coating apparatus and to measure the state of the coating film T. In addition, since a mechanism for drying the coating film T applied to the base material is not required as in the conventional art, it is possible to prevent an increase in the size of the apparatus and reduce the cost required to operate this mechanism. . Further, the coating liquid E can be reused by the coating liquid recycling means 8 . Therefore, since the consumption of the coating liquid E can be suppressed, the cost can be further reduced compared to the conventional art. Further, since the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 are provided, the actual product can be manufactured by forming the coating T on both sides of the base material. Even if there is, it is possible to measure the state of the coating film T correspondingly.

[Second embodiment]
Next, a coating device 1 according to a second embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in that the coating device 1 has feedback means.

In this embodiment, the coating device 1 has feedback means. The feedback means provides the measurement results obtained by each of the first coating film measuring means 22 and the second coating film measuring means 32 (hereinafter referred to as each coating film measuring means) to the first coating mechanism 21 immediately during coating. This is to reflect the application of the coating liquid E by each of the second coating mechanisms 31 (hereinafter referred to as each coating mechanism). In this embodiment, the controller is the feedback means. This feedback means determines whether or not the coating conditions by each coating mechanism are optimal based on the measurement results output by each coating film measuring means, and immediately determines whether the coating conditions by each coating mechanism are optimal. The coating condition adjusting means is controlled so as to obtain a satisfactory result.

A specific description will be given. For example, the state of the coating film T formed on the outer peripheral surface of the coating sheet S by the first coating mechanism 21 is measured by the first coating film measuring means 22 . When the feedback means determines that the coating conditions by the first coating mechanism 21 are not optimal from the measurement results, the feedback means immediately controls the coating conditions by the first coating mechanism 21 to optimize the coating conditions. It controls the condition adjusting means. While each coating mechanism is applying the coating liquid E to the coating sheet S continuously circulated at a predetermined speed to form the coating film T, the feedback means is adapted to determine the optimum coating conditions by each coating mechanism. The coating condition adjusting means is controlled so as to obtain a satisfactory result. This makes it possible to efficiently improve the application accuracy of the application liquid E by each application mechanism. In addition, it becomes possible to maintain the improved application accuracy.

[Third embodiment]
Next, a coating device 1 according to a third embodiment of the present invention will be described. This embodiment differs from the first and second embodiments in that the coating device 1 has a circulation roll temperature control means (not shown).

In this embodiment, the coating device 1 has a circulation roll temperature control means (not shown). The circulating roll temperature adjusting means is for adjusting the temperature of each of the plurality of circulating coating rolls 11, and is composed of, for example, a heater having a cooling function utilizing the Peltier effect. This circulation roll temperature control means is provided inside and/or outside each circulation roll 11 and cools the surface layer of the circulation roll 11 . Thereby, the temperature of the application sheet S in contact with the circulation rolls 11 can be maintained at a desired temperature. As a result, the application of the coating liquid E by the first coating unit 21a and the second coating unit 31a (hereinafter referred to as each coating unit), the first coating film removing means 23 and the second coating film removal are performed. While the coating sheet S is heated by the frictional heat generated when the coating film T is removed by each of the means 33 (hereinafter referred to as each coating film removing means), the temperature of the coating sheet S is set to a desired temperature. so that it can be cooled. Therefore, it is possible to prevent deformation of the coating sheet S due to heating.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the configurations and combinations thereof in each embodiment are examples, and additions, omissions, Substitutions and other modifications are possible. For example, in the above embodiment, the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 are used to form the coating film T on both sides of the coating sheet S, and the state of the formed coating film T is measured. Although an example of measurement has been described, the coating film T is formed on one side of the coating sheet S using either the first coating film measuring mechanism 2 or the second coating film measuring mechanism 3 depending on the application, The state of the formed coating film T may be measured. That is, the coating film measuring mechanism 1 has at least one of the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3, and the coating liquid is applied to only one of the outer peripheral surface and the inner peripheral surface of the coating sheet S. The application of E and the measurement of the state of the coating film T may be performed.

Further, in the above-described embodiment, an example was described in which the route along which the coating sheet S circulates is formed by the circulation rolls 11a, 11b, 11c, and 11d as shown in FIG. Not limited. For example, when the coating film T is formed on both surfaces of the coating sheet S using the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3, and the state of the formed coating film T is measured, at least The circulation rolls 11 may be arranged so as to form a route for the coating sheet S to pass through the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 .

Moreover, the arrangement of each part constituting the coating apparatus 1 is not limited to that shown in FIG. For example, as shown in FIG. 5, the first coating film removing means 23 is arranged at a position where the coating film T can be removed from the outer peripheral surface of the coating sheet S before the coating film T is formed on the inner peripheral surface of the coating sheet S. You may This prevents the coating film T from adhering to the auxiliary roll 73b facing the blade 71b of the second coating film removing means 33. As shown in FIG. Further, the state of the coating film T formed on the inner peripheral surface of the coating sheet S can be measured without being affected by the formation of the coating film T on the outer peripheral surface of the coating sheet S.

Further, in the above-described embodiment, an example in which each coating film measuring means is composed of the film thickness measuring means 61 and the width measuring means 62 has been described, but it may be changed as appropriate according to the purpose of measurement. For example, it may consist of lighting and a camera. As a result, even when each coating mechanism performs so-called intermittent coating in which a coated region coated with the coating liquid E and a non-coated region where the coating liquid E is not coated are continuously formed, the state of each formed region can be changed. can be inspected.

Further, the discharge port of each coating part and the blade of each coating film removing means are arranged so that the seam formed by forming the coating sheet S in a ring shape does not come into contact with the discharge port of each coating part and the blade 71 of each coating film removing means. Means for separating 71 from the coating sheet S may be provided. As a result, it is possible to prevent the discharge port of each coating section and the blade 71 of each coating film removing means from being damaged. The position of the seam of the coating sheet S may be detected by a camera or a sensor (not shown). Based on the detection result, the ejection port of each coating section and the blade 71 of each coating film removing means are separated from the coating sheet S. .

Further, blade cleaning means (not shown) for cleaning the blade 71 may be provided for each coating film removing means. The blade cleaning means may be formed of a sponge, for example, and may be configured to remove the coating liquid E on the blade 71 by scraping it from the width direction side of the blade 71 . As a result, it is possible to prevent the coating liquid E from accumulating in the center of the blade 71 from the vicinity of the tip.

Also, a plurality of coating film removing means may be provided. Thereby, the coating film T on the coating sheet S can be reliably removed.

Further, a wiping mechanism may be provided for wiping off the portion of the coating sheet S from which the coating film T has been removed by each of the coating film removing means. As a result, the coating film T on the coating sheet S can be removed more reliably.

Further, in the above-described embodiment, an example in which each coating film removing means is composed of the blade 71 and the blade holder 72 has been described, but the present invention is not limited to this. For example, it may be configured by a suction mechanism for sucking the coating film T, or may be configured by a wiping mechanism for wiping the coating film T.

Further, in the above-described embodiment, the coating liquid recycling means 8 included in each of the first coating film measuring mechanism 2 and the second coating film measuring mechanism 3 includes the recovery tank 81, the tray section 82, and the recycling channel. 83 and the pump 84 have been described, but the present invention is not limited to this. For example, an opening for collecting the coating liquid E may be provided in the supply tank 41 of each coating mechanism, and the coating liquid E forming the coating film T removed by each coating film removing means may be directly recovered. That is, the supply tank 41 and the recovery tank 81 may be shared as one tank.

Further, a mechanism for adjusting the temperature of the coating liquid E may be provided in the flow passage of the coating liquid E of the coating liquid supply means 4 of each coating section and/or each coating mechanism. Thereby, the temperature of the coating liquid E applied by each coating part can be adjusted, and the thickness of the coating film T can be stably maintained and managed.

Further, a mechanism for adjusting the temperature of the coating liquid E may be provided in the coating liquid recycling means 8 .

Also, the coating flow rate adjusting means of each coating mechanism may not have the width direction adjusting section 44 . That is, the application flow rate of the application liquid E applied by each application unit may be adjusted only by controlling the pump 43 without using the branch flow path 44a and the valve 44b.

1 coating device 11 circulation roll 11a circulation roll 11b circulation roll 11c circulation roll 11d circulation roll 11e circulation roll 2 first coating film measuring mechanism 21 first coating mechanism 21a first coating section 22 first coating film measuring means 23 First coating film removing means 3 Second coating film measuring mechanism 31 Second coating mechanism 31a Second coating section 32 Second coating film measuring means 33 Second coating film removing means 4 Coating liquid supply means 41 Supply Tank 42 Supply channel 43 Pump 44 Width direction adjusting part 44a Branch channel 44b Valve 51 Manifold 52 Slit 53 Discharge port 61 Film thickness measuring means 62 Width measuring means 71 Blade 71a Blade 71b Blade 72 Blade holder 72a Blade holder 72b Blade holder 73a Auxiliary Roll 73b Auxiliary Roll 8 Coating Liquid Recycling Means 81 Collection Tank 82 Tray Part 83 Recycling Channel 84 Pump S Coating Sheet T Coating Film E Coating Liquid

Claims (11)

A coating device for measuring the state of a coating film formed by a coating portion that applies a coating liquid,
an application sheet formed in an annular shape;
a plurality of circulation rolls for circulating the coating sheet at a predetermined speed;
a first coating unit that applies a coating liquid to a predetermined surface of the coating sheet circulating by the plurality of circulation rolls to form a coating film;
a first coating film measuring means for measuring the state of the coating film formed on the predetermined surface of the coating sheet by the first coating unit;
a first coating film removing means for removing the coating film from the predetermined surface of the coating sheet before the coating film measured by the first coating film measuring means reaches the first coating portion again; , and
A coating apparatus, wherein the first coating section, the first coating film measuring means, and the first coating film removing means operate with respect to the continuously circulating coating sheet. The ejection port for applying the coating liquid of the first coating part is
2. The coating apparatus according to claim 1, wherein the coating sheet is disposed so as to face any one of the plurality of circulation rolls. The coating liquid recycling means recovers the coating liquid forming the coating film removed by the first coating film removing means, and re-applies the recovered coating liquid by the first coating section. 3. The coating device according to claim 1 or 2, characterized in that: The first coating film removing means is formed in a thin plate shape,
3. The coating film is scraped off and removed from the predetermined surface of the coating sheet by pressing an end portion of the first coating film removing means against the predetermined surface of the coating sheet. The coating device according to any one of claims 1 to 3. The coating sheet is disposed so as to face the first coating film removing means with the coating sheet interposed therebetween, and the coating sheet is supported from the back surface of the predetermined surface of the coating sheet so that the coating by the first coating film removing means can be performed. 5. The coating apparatus according to any one of claims 1 to 4, further comprising an auxiliary roll for assisting removal of the film. 6. The coating apparatus according to any one of claims 1 to 5, further comprising circulating roll temperature control means for regulating the temperature of said circulating roll. coating condition adjusting means for reflecting the results obtained by the coating film measuring means in the continuous circulation of the coating sheet and controlling the coating conditions for applying the coating liquid to the first coating section; 7. The coating device according to any one of claims 1 to 6. 8. The applying condition adjusting means has a width direction adjusting portion for adjusting a flow rate of the application liquid applied by the first applying portion across a width direction of the first applying portion. Coating device according to. 9. The coating apparatus according to any one of claims 1 to 8, wherein the first coating unit is a die for coating a slurry of electrode material for manufacturing an electrode plate for a battery. a second coating unit that applies a coating liquid to the back surface of the predetermined surface of the circulating coating sheet to form the coating film;
a second coating film measuring means for measuring the state of the coating film formed on the back surface of the predetermined surface of the coating sheet by the second coating unit;
Second coating film removal for removing the coating film from the reverse side of the predetermined surface of the coating sheet until the coating film measured by the second coating film measuring means reaches the second coating portion again 10. The coating device according to any one of claims 1 to 9, comprising means. Each of the first coating film removing means and the second coating film removing means
After the coating film is formed on both surfaces of the coating sheet and measured by the first coating film measuring means and the second coating film measuring means, the first coating portion and the second coating portion are measured. 11. The coating apparatus according to claim 10, wherein the coating film is removed from the coating sheet before reaching whichever comes first.

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