JP2022149458A - Coating device - Google Patents

Abstract

To provide a coating device capable of reducing the cost required for measuring a state of coating in relative to the prior arts.SOLUTION: The present invention relates to a coating device for measuring a state of coating formed by a coating part which applies a coating liquid. The coating device comprises: a substantially columnar coating roll which is rotated at a predetermined speed with a central axis defined as a rotation axis; the coating part which forms coating by coating an outer peripheral surface of the rotating coating roll with the coating liquid; coating measuring means for measuring the state of the coating formed on the outer peripheral surface of the coating roll; and coating removing means for removing the coating from the outer peripheral surface of the coating roll until the coating measured by the coating measuring means arrives at the coating part again. The coating part, the coating measuring means and the coating removing means are operated with respect to the continuously rotating coating roll.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 of the present invention for solving the above-mentioned problems is a coating device for measuring the state of a coating film formed by a coating portion that applies a coating liquid, and rotates at a predetermined speed with a central axis as a rotation axis. A substantially cylindrical coating roll, the coating section for forming a coating film by coating a coating liquid on the outer peripheral surface of the rotating coating roll, and the state of the coating film formed on the outer peripheral surface of the coating roll. and a coating film removing means for removing the coating film from the outer peripheral surface of the coating roll until the coating film measured by the coating film measuring means reaches the coating portion again. , wherein the coating section, the coating film measuring means, and the coating film removing means operate with respect to the continuously rotating coating roll.

According to the coating apparatus, the coating portion forms a coating film on the outer peripheral surface of the coating roll, the state of the formed coating film is measured by the coating film measuring means, and the measured coating film is removed. It is removed from the outer peripheral surface of the coating roll by means. Since these operations are performed on the coating roll that rotates continuously at a predetermined speed, a coating film can be formed on the surface where the coating liquid does not adhere and the state of the coating film can be obtained without using a substrate. measurements can be made many times in succession. Therefore, it is possible to reduce costs compared to the conventional method in which a coating film is formed on a substrate and the state of the coating film is measured.

Further, it may be configured to have a coating liquid recycling means for recovering the coating liquid forming the coating film removed by the coating film removing means and for re-coating the recovered coating liquid by the coating section. .

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

Further, the coating film removing means is formed in a thin plate shape, and the coating film is scraped off from the outer peripheral surface of the coating roll by pressing the end portion of the coating film removing means against the coating roll. It is good also as a structure which removes by

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

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

According to this configuration, the application roll can be maintained at a desired temperature by temperature control. Therefore, it is possible to prevent the application roll from being heated and deformed by heat such as frictional heat generated by the application of the application liquid by the application portion and the removal of the coating film by the coating film removing means.

Further, the coating condition adjusting means may be provided for reflecting the results obtained by the coating film measuring means during continuous rotation of the coating roll and controlling the coating conditions for the coating portion to apply the coating liquid. good.

According to this configuration, it is possible to efficiently improve the application accuracy of the application liquid by the 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 coating portion across the width direction of the coating portion.

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

Further, the application part may be a die for applying a slurry of an electrode material for manufacturing 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.

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 coating device in 1st embodiment of this invention. FIG. 3 is a view taken along the line AA of FIG. 2; It is a figure which shows the variation of the coating mechanism in 1st embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the coating system provided with the coating device in one Embodiment of this invention, (a) is a figure which shows the time of coating-film measurement, (b) is a figure which shows the time of manufacture of a product. 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 coating device 1 according to the first embodiment. 3 is a view taken along the line AA in FIG. 2. FIG. FIG. 4 is a diagram showing variations of the coating mechanism in the first embodiment.

As shown in FIG. 1, the coating device 1 in the present embodiment applies a coating liquid E (see FIG. 2) to form a coating film T (see FIG. 2), and the coating mechanism 20 itself. A coating roll 11 on which the coating film T is formed on the outer peripheral surface of the coating roll 11, a coating film measuring means 12 for measuring the state of the coating film T formed on the outer peripheral surface of the coating roll 11, and on the outer peripheral surface of the coating roll 11 and a coating liquid reusing means 14 for reusing the coating liquid E forming the coating T removed by the coating film removing means 13 .

The coating device 1 measures the state of the coating film T formed by coating the coating liquid E on the outer peripheral surface of the coating roll 11 under arbitrary coating conditions. Based on this measurement result, it is possible to evaluate whether or not 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 application mechanism 20 . 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 roll 11 in the present embodiment is formed in a substantially cylindrical shape, and can rotate continuously at a predetermined speed with the central axis of the cylinder as the rotation axis. The rotation speed of the application roll 11 is controlled by the control section 3 (see FIG. 1). The controller 3 is composed of, for example, a general-purpose computer device, and controls the rotation speed of the application roll 11 so as to achieve a set rotation speed. The rotation speed of the application roll 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. The coating film T is formed by coating the coating liquid E by the coating mechanism 20, which will be described later, on the outer peripheral surface of the coating roll 11 that continuously rotates at a predetermined speed.

The coating mechanism 20 in this embodiment is for coating the coating liquid E onto the outer peripheral surface of the coating roll 11 that continuously rotates at a predetermined speed to form the coating film T. As shown in FIG. As shown in FIG. 1, the coating mechanism 20 comprises a coating section 21 for coating the coating liquid and coating liquid supply means 22 for supplying the coating liquid to the coating section 21 . The operation of each part that constitutes the coating mechanism 20 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 constituting the application mechanism 20 may be performed by the control part 3 described above.

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

The application part 21 is for applying the application liquid E. As shown in FIG. The coating part 21 is formed long along the rotation axis direction of the coating roll 11 (the Y-axis direction in FIG. 1). Further, the coating unit 21 is spaced apart from the coating roll 11 by a predetermined distance so that its width direction (the Y-axis direction in FIG. 1) and the rotation axis direction of the coating roll 11 (hereinafter referred to as the rotation axis direction) are parallel. are placed.

As shown in FIGS. 2 and 3, the coating unit 21 is connected to the coating liquid supply means 22, and has a manifold 21a which is a space for storing the coating liquid E long in the width direction. It has a wide slit 21b and an ejection port 21c that has the same length as the slit 21b in the width direction and ejects the coating liquid E. As shown in FIG. The discharge port 21 c faces the outer peripheral surface of the coating roll 11 . As a result, the coating liquid E stored in the manifold 21a is discharged onto the outer peripheral surface of the coating roll 11 from the discharge port 21c via the slit 21b.

The coating liquid supply means 22 is for supplying the coating liquid E to the coating section 21 . As shown in FIG. 1, the coating liquid supply means 22 includes a supply tank 22a for storing the coating liquid E, a supply channel 22b connecting the supply tank 22a and the manifold 21a, and a supply channel 22b for supplying the coating liquid E from the supply tank 22a to the manifold. It is composed of a pump 22c that feeds liquid to 21a. As a result, the application liquid E stored in the supply tank 22a is sent through the supply channel 22b by the pump 22c and supplied to the manifold 21a.

With these configurations, the coating mechanism 20 can apply the coating liquid E in a band shape onto the outer peripheral surface of the coating roll 11 that continuously rotates at a predetermined speed to form the coating film T. As shown in FIG.

In addition, the coating mechanism 20 in this embodiment further has coating condition adjusting means. The coating condition adjusting means controls the coating conditions under which the coating liquid E is applied by the coating mechanism 20 . The application condition adjusting means controls the application conditions by adjusting the operation and position of each part of the application mechanism 20 . 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 coating section 21 . This coating flow rate adjusting means is, for example, the pump 22c in this embodiment. By controlling the operation of this pump 22c, the flow rate of the coating liquid E supplied to the manifold 21a is adjusted. That is, it becomes possible to adjust the flow rate of the coating liquid E applied by the coating unit 21 .

In addition, the coating flow rate adjusting means in this embodiment further has a width direction adjusting portion 23 . As shown in FIG. 3, the width direction adjusting portion 23 is composed of a plurality of branched flow paths 23a branched from the supply flow path 22b and valves 23b corresponding to the branched flow paths 23a. Each of these branch flow paths 23a is connected to the manifold 21a, and the flow rate of the coating liquid E supplied to the manifold 21a from each of these branch flow paths 23a is adjusted by the degree of opening of the valve 23b. Here, each of the branch flow paths 23a is preferably arranged at predetermined intervals in the width direction of the manifold 21a. Thereby, the flow rate of the coating liquid E supplied to the manifold 21a can be adjusted across the width direction. That is, the flow rate of the coating liquid E applied by the coating section 21 can be adjusted with high accuracy across the width direction.

It should be noted that the width direction adjusting portion 23 is not limited to the branch flow path 23a and the valve 23b. For example, as shown in FIG. 4, the application liquid E is removed from a plurality of locations in the flow path of the application liquid E in the width direction of the application section 21, thereby adjusting the application flow rate of the application liquid E applied by the application section 21. can be In addition, a plurality of bolts are provided in the application section 21, and the thrust of these bolts is applied to the application section 21, thereby deforming the application section 21 and adjusting the application flow rate of the application liquid E in the width direction of the application section 21. may be

Further, the coating condition adjusting means is not limited to having the coating flow rate adjusting means. For example, it may have a mechanism for adjusting the distance between the coating section 21 and the coating roll 11 . Thereby, the width of the coating film T formed by the coating part 21 can be adjusted.

The coating film measuring means 12 measures the state of the coating film T formed on the outer peripheral surface of the coating roll 11 that is continuously rotated at a predetermined speed by the coating mechanism 20 . The coating film measuring means 12 in this embodiment includes a film thickness measuring means 12a (for example, a displacement gauge) for measuring the thickness of the coating film T and a width measuring means 12b 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 12a and width measuring means 12b may be controlled by the control section 3 described above, and the thickness and width of the coating film T can be measured by operating these.

In this embodiment, the result of measurement by the coating film measuring means 12 is output to the control section 3 described above. By checking the output measurement results, it is possible to evaluate whether or not the coating conditions are optimal.

As a result of this evaluation, if the coating conditions are not optimal, the operation and position of each part of the coating mechanism 20 for coating the coating liquid E is adjusted by the coating condition adjusting means so that the state of the coating film T approaches the desired state. By adjusting the coating conditions are controlled. This makes it possible to optimize the coating conditions. That is, since the coating portion 21 can form the coating film T under the optimum coating conditions to manufacture the electrode plate for the battery, it is possible to improve the quality of the battery (for example, improve the charge/discharge performance). Become.

The coating film removing means 13 is for removing the coating film T measured by the coating film measuring means 12 from the outer peripheral surface of the coating roll 11. As shown in FIG. It is arranged so as to be positioned between the film measuring means 12 and the coating section 21 . That is, at least the coating film T measured by the coating film measuring means 12 is removed from the outer peripheral surface of the coating roll 11 until it reaches the coating section 21 again. As shown in FIG. 2, the coating film removing means 13 in this embodiment comprises a blade 13a formed in a thin plate shape and a blade holder 13b to which the blade 13a is attached.

The blade 13a is formed long along the direction of the rotation axis, and is arranged to face the outer peripheral surface of the coating roll 11 so that its width direction (the Y-axis direction in FIG. 2) and the direction of the rotation axis are parallel to each other. ing. By pressing the tip of the blade 13a against the outer peripheral surface of the coating roll 11, the coating film T is scraped off from the outer peripheral surface of the coating roll 11 and removed. Note that the blade 13a is made of, for example, PET (polyethylene terephthalate), epoxy resin, high polymer, or the like. Further, the thickness of the blade 13a is preferably such that the blade 13a naturally follows the outer peripheral surface of the coating roll 11 when the blade 13a is pressed against the outer peripheral surface of the coating roll 11 (for example, 0.5 mm). 5 to 1.0 mm).

The blade holder 13b is for holding the blade 13a at a predetermined position, and has a structure in which the blade 13a can be freely attached and detached. That is, the material and dimensions of the blade 13a can be freely selected and used according to the application. Further, the blade holder 13b may have a mechanism (not shown) for separating and contacting the blade 13a with respect to the outer peripheral surface of the coating roll 11. As shown in FIG. As a result, the degree of pressing of the blade 13a against the outer peripheral surface of the coating roll 11 can be adjusted to the extent that the wear of the coating roll 11 can be suppressed.

Also, the paint film removing means 13 may be provided with a blade cleaning means (not shown) for cleaning the blade 13a. 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 13a by scraping it from the width direction side of the blade 13a. Thereby, it is possible to prevent the coating liquid E from accumulating in the center from the vicinity of the tip of the blade 13a.

Each of the coating mechanism 20, the coating film measuring means 12, and the coating film removing means 13 as described above is operated with respect to the coating roll 11 which continuously rotates at a predetermined 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 coating device 1 in the present embodiment continuously rotates the coating roll 11 at the same speed as the conventional base material transport speed, applies the coating liquid E to the coating roll 11, The state of the formed coating film T is measured, and the coating film T is removed after measurement. It can be done continuously any number of times.

The coating liquid reusing means 14 is for reusing the coating liquid E that forms the coating film T removed by the coating film removing means 13 . In this embodiment, the coating liquid recycling means 14 includes a recovery tank 14a for recovering the coating liquid E forming the coating film T removed by the coating film removing means 13 as shown in FIGS. By means of a tray portion 14b that guides the coating liquid E to the recovery tank 14a, a reuse channel 14c that connects the recovery tank 14a and the supply tank 22a, and a pump 14d that feeds the coating liquid E from the recovery tank 14a to the supply tank 22a. Configured.

The tray portion 14b is formed in a flat plate shape, and is arranged to be inclined from the coating film removing means 13 toward the recovery tank 14a so as to guide the coating liquid E to the recovery tank 14a as shown in FIG. As a result, the coating liquid E that forms the coating film T removed by the coating film removing means 13 can be reliably recovered in the recovery tank 14a. Note that the tray portion 14b 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, which is guided to the recovery tank 14a by the tray portion 14b and recovered by the recovery tank 14a, is sent by the pump 14d to the supply tank 22a through the reuse channel 14c. Then, the coating liquid E sent to the supply tank 22 a is again coated on the coating roll 11 by the coating section 21 . That is, the coating liquid E that has been applied once can be reused.

As described above, according to the coating apparatus 1 of the first embodiment, it is possible to obtain measurement results equivalent to conventional measurement of the state of the coating film T without using a base material. Therefore, it is possible to reduce the cost of measurement compared to 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 roll 11 rotates. 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, unlike conventional systems, there is no need for a mechanism for transporting the substrate or a mechanism for drying the coating film applied to the substrate, so the size of the device can be prevented and the cost required to operate these mechanisms can be reduced. It becomes possible to Further, the coating liquid E can be reused by the coating liquid recycling means 14 . As a result, the consumption of the coating liquid E can be suppressed, so that the cost can be further reduced as compared with the conventional method.

[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 is for immediately reflecting the result of measurement by the coating film measuring means 12 on the coating of the coating liquid E of the coating mechanism 20 during coating. In this embodiment, the controller 3 is feedback means. This feedback means determines whether or not the coating conditions by the coating mechanism 20 are optimal based on the measurement results output by the coating film measuring means 12, and the coating conditions by the coating mechanism 20 are immediately optimized. It controls the coating condition adjusting means. Specifically, the feedback means controls the coating condition adjustment means of the coating mechanism 20 so that the coating conditions for coating the coating liquid E by the coating mechanism 20 are optimized.

A specific description will be given. For example, the state of the coating film T formed on the outer peripheral surface of the coating roll 11 by the coating mechanism 20 is measured by the coating film measuring means 12 . When the feedback means determines that the coating conditions by the coating mechanism 20 are not optimal from the measurement results, the feedback means immediately controls the coating condition adjustment means to optimize the coating conditions by the coating mechanism 20. conduct. The feedback means optimizes the coating conditions of the coating mechanism 20 while the coating liquid E is applied to the coating roll 11 continuously rotating at a predetermined speed to form the coating film T. It controls the coating condition adjusting means as follows. This makes it possible to efficiently improve the application accuracy of the application liquid E by the application mechanism 20 . 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 roll temperature control means (not shown).

In this embodiment, the coating device 1 has roll temperature control means (not shown). The roll temperature control means is for controlling the temperature of the coating roll 11, and is composed of a heater having a cooling function utilizing the Peltier effect, for example. This roll temperature control means is provided inside and/or outside the coating roll 11 to cool the surface layer of the coating roll 11 . Thereby, the coating roll 11 can be cooled. That is, while the coating roll 11 is heated by the frictional heat generated when the coating liquid E is applied by the coating unit 21 and when the coating film T is removed by the coating film removing means 13, the temperature of the coating roll 11 is set to a predetermined temperature. can be maintained. Therefore, it is possible to prevent deformation of the coating roll 11 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, the coating device 1 may be provided in a coating system 2 (see FIG. 5) having a transport roll for transporting the base material W and a mechanism for drying the coating film T. FIG. Specifically, as shown in FIG. 5(a), the coating device 1 is provided in the coating system 2, and the coating system 2 conveys the base material W in order to actually manufacture the product as shown in FIG. 5(b). Then, the application accuracy can be evaluated before the application liquid E is applied to the conveyed base material W. Also, the coating device 1 may be independent of the coating system 2 .

In the above embodiment, the coating film measuring means 12 is composed of the film thickness measuring means 12a and the width measuring means 12b. For example, it may consist of lighting and a camera. As a result, even when the coating mechanism 20 performs so-called intermittent coating, in which coating regions coated with the coating liquid E and non-coating regions where the coating liquid E is not coated are continuously formed, the states of the formed regions can be changed. can be inspected.

Further, in the above-described embodiment, an example in which the coating film removing means 13 is composed of the blade 13a and the blade holder 13b 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.

Also, a plurality of coating film removing means 13 may be provided. This makes it possible to reliably remove the coating film T on the outer peripheral surface of the coating roll 11 .

Further, a wiping mechanism may be provided for wiping off the portion of the outer peripheral surface of the coating roll 11 from which the coating film T has been removed by the coating film removing means 13 . This makes it possible to more reliably remove the coating film T on the outer peripheral surface of the coating roll 11 .

Further, in the above-described embodiment, an example in which the coating liquid recycling unit 14 is configured by the collection tank 14a, the tray part 14b, the recycling channel 14c, and the pump 14d has 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 22a, and the coating liquid E forming the coating film T removed by the coating film removing means 13 may be directly recovered. In other words, the supply tank 22a and the recovery tank 14a may be shared as one tank.

Further, in the above-described embodiment, an example in which the roll temperature control means is composed of a heater has been described, but the present invention is not limited to this. For example, before the coating film T is removed from the outer peripheral surface of the coating roll 11 by the coating film removing means 13 and the coating liquid E is applied again by the coating mechanism 20 to the portion from which the coating film T has been removed, The coating roll 11 may be cooled by spraying the solvent of the coating liquid E onto that portion.

Further, a mechanism for adjusting the temperature of the coating liquid E may be provided in the flow path of the coating section 21 and/or the coating liquid supply means 22 through which the coating liquid E flows. Thereby, the temperature of the coating liquid E applied by the coating part 21 can be adjusted, and the thickness of the coating film M 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 14 .

Also, the coating flow rate adjusting means may not have the width direction adjusting portion 23 . That is, the application flow rate of the application liquid E applied by the application unit 21 may be adjusted only by controlling the pump 22c without using the branch flow path 23a and the valve 23b.

REFERENCE SIGNS LIST 1 coating device 11 coating roll 12 coating film measuring means 12a film thickness measuring means 12b width measuring means 13 coating film removing means 13a blade 13b blade holder 14 coating liquid recycling means 14a collection tank 14b tray section 14c reuse channel 14d pump 2 Coating device 20 Coating mechanism 21 Coating part (die)
21a Manifold 21b Slit 21c Discharge port 22 Coating liquid supply means 22a Supply tank 22b Supply channel 22c Pump 23 Width direction adjusting part 23a Branch channel 23b Valve 3 Control part T Coating E Coating liquid W Base material

Claims (7)

A coating device for measuring the state of a coating film formed by a coating portion that applies a coating liquid,
a substantially cylindrical coating roll that rotates at a predetermined speed with a central axis as a rotation axis;
the coating unit for forming a coating film by coating a coating liquid on the outer peripheral surface of the rotating coating roll;
a coating film measuring means for measuring the state of the coating film formed on the outer peripheral surface of the coating roll;
a coating film removing means for removing the coating film from the outer peripheral surface of the coating roll by the time the coating film measured by the coating film measuring means reaches the coating portion again,
A coating apparatus, wherein the coating section, the coating film measuring means, and the coating film removing means operate with respect to the continuously rotating coating roll. The apparatus further comprises coating liquid recycling means for recovering the coating liquid forming the coating film removed by the coating film removing means and for re-coating the recovered coating liquid by the coating section. Item 1. The coating device according to item 1. The coating film removing means is formed in the shape of a thin plate,
3. The coating film is removed by scraping off the coating film from the outer peripheral surface of the coating roll by pressing the end of the coating film removing means against the coating roll. 1. The coating device according to claim 1. 4. The coating apparatus according to claim 1, further comprising roll temperature control means for controlling the temperature of said coating roll. It is characterized by comprising a coating condition adjusting means for reflecting the result obtained by the coating film measuring means during continuous rotation of the coating roll and controlling the coating conditions for applying the coating liquid to the coating section. The coating device according to any one of claims 1 to 4. 6. The coating apparatus according to claim 5, wherein said coating condition adjusting means has a width direction adjusting section for adjusting a flow rate of the coating liquid applied by said coating section across a width direction of said coating section. 7. The coating apparatus according to any one of claims 1 to 6, wherein the coating unit is a die for coating a slurry of an electrode material for manufacturing an electrode plate for a battery.

Images