WO2023189669A1 - Method for removing coating layer and device for removing coating layer - Google Patents

Abstract

This method for removing a coating layer has: a step for preparing a roll (1) on which is wound a laminated film (50) having a base film (51) and a coating layer; a step for unrolling the laminated film (50) from the roll (1); a step for stretching the unrolled laminated film (50); a step for immersing the stretched laminated film (50A) in hot water (HW) within a water tank (32), thereby removing the coating layer from the laminated film (50A); and a step for winding up the base film (51), from which the coating layer has been removed, into a roll. The coating layer includes an intermediate layer and a release agent layer, and the intermediate layer is disposed between the base film (51) and the release agent layer.

Description

Coating layer removal method and coating layer removal device

The present invention relates to a coating layer removal method and a coating layer removal device.

In recent years, from the perspective of global resource conservation and environmental protection, there has been an active movement in various fields to create a recycling-oriented society through efforts such as waste generation control, reuse, and recycling.
For example, Patent Document 1 describes at least a step of unwinding a laminated film, a step of supplying hot water to the surface of the unwound laminated film, a step of peeling a surface laminated portion from the laminated film, and a step of peeling off a base film after peeling. Disclosed is a method for peeling a laminated film comprising a step of winding up the laminated film, the method comprising bringing hot water into contact with the surface of the laminated film for 2 seconds or more, and then peeling off the surface laminated portion. There is.

Japanese Patent Application Publication No. 2004-363140

The laminated film used in Patent Document 1 has a structure in which a water-soluble resin layer is sandwiched between a water-insoluble base film and a surface functional layer. There is a problem in that the speed at which the surface functional layer is separated (peeled off) is limited.

An object of the present invention is to provide a coating layer removal method and a coating layer removal device that can easily remove the coating layer from a laminated film that is conveyed roll-to-roll in a laminated film that has a base film and a coating layer. There is a particular thing.

[1] A step of preparing a roll wound with a laminated film having a base film and a coating layer;
Paying out the laminated film from the roll;
a step of stretching the unrolled laminated film;
removing the coating layer from the laminated film by immersing the stretched laminated film in warm water in a water tank;
a step of winding up the base film from which the coating layer has been removed into a roll;
The coating layer includes an intermediate layer and a release agent layer,
the intermediate layer is disposed between the base film and the release agent layer,
How to remove coating layer.

[2] The step of removing the coating layer is a step of immersing the stretched laminated film in the warm water and then scraping off the coating layer from the base film.
The method for removing a coating layer according to [1] above.

[3] Further comprising the step of causing the hot water to overflow from the upper part of the water tank and discharging the residue of the coating layer that has fallen off from the laminated film to the outside of the water tank.
The method for removing a coating layer according to [1] or [2] above.

[4] The step of stretching the laminated film is performed while heating the laminated film.
The method for removing a coating layer according to any one of [1] to [3] above.

[5] After the base film from which the coating layer has been removed is taken out from the hot water and before the step of winding up the base film into a roll, further comprising the step of removing foreign matter on the base film. have,
The method for removing a coating layer according to any one of [1] to [4] above.

[6] The base film and the intermediate layer are in direct contact.
The method for removing a coating layer according to any one of [1] to [5] above.

[7] The intermediate layer is hydrophilic and water-insoluble.
The method for removing a coating layer according to any one of [1] to [6] above.

[8] The laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
The method for removing a coating layer according to any one of [1] to [7] above.

[9] A coating layer removal device for removing the coating layer from a laminated film having a base film and a coating layer,
A feeding means for feeding out the laminated film from a roll around which the laminated film is wound;
Stretching means for stretching the fed-out laminated film;
immersion means comprising a water tank for immersing the stretched laminated film in warm water;
a winding means for winding the base film taken out from the water tank into a roll;
Coating layer removal equipment.

[10] The immersion means includes means for scraping off the coating layer from the base film in the water tank,
The scraping means is a blade or a wire brush.
The coating layer removal device according to [9] above.

[11] The above-mentioned [9] or [10], wherein the immersion means has a structure that causes the hot water to overflow from the upper part of the water tank and discharges the residue of the coating layer that has fallen off from the laminated film to the outside of the water tank. The coating layer removal device described in ].

[12] The stretching means includes a heating means for heating the laminated film.
The coating layer removal device according to any one of [9] to [11].

[13] A foreign matter removing means for removing foreign matter on the base film is provided between the dipping means and the winding means;
The coating layer removal device according to any one of [9] to [12].

[14] The laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
The coating layer removal device according to any one of [9] to [13].

According to one aspect of the present invention, in a laminated film having a base film and a coating layer, a coating layer removal method and a coating layer removal apparatus capable of easily removing the coating layer from a laminated film conveyed roll-to-roll. can be provided.

1 is an example of a cross-sectional view of a laminated film that can be used in the coating layer removal method according to the first embodiment. It is an example of the cross-sectional view of the laminated film when the laminated film shown in FIG. 1 is stretched in the longitudinal direction by a stretching process. It is a micrograph showing a state in which cracks have occurred in the coating layer, and is a top view of the laminated film viewed from the coating layer side. It is a schematic diagram showing an example of a coating layer removal device concerning a 2nd embodiment. It is a schematic diagram of an example of an immersion means and a foreign matter removal means concerning a 3rd embodiment. It is a schematic diagram of an example of an immersion means and a foreign matter removal means concerning a 4th embodiment. It is a schematic diagram of an example of an immersion means and a foreign matter removal means concerning a 5th embodiment.

[First embodiment]
(Method for removing coating layer)
The coating layer removal method according to the present embodiment includes a step of preparing a roll around which a laminated film having a base film and a coating layer is wound (hereinafter also referred to as a preparation step), and removing the laminated film from the roll. A step of feeding out the film (hereinafter also referred to as a feeding step), a step of stretching the fed laminated film (hereinafter also referred to as a stretching step), and immersing the stretched laminated film in warm water in a water tank. a step of removing the coating layer from the laminated film (hereinafter also referred to as a removal step); and a step of winding up the base film from which the coating layer has been removed into a roll (hereinafter also referred to as a winding step). and has.
The coating layer includes an intermediate layer and a release agent layer, and the intermediate layer is disposed between the base film and the release agent layer.

FIG. 1 is an example of a cross-sectional view of a laminated film 50 that can be used in the coating layer removal method according to the present embodiment.
Laminated film 50 has a base film 51 and a coating layer 52. The coating layer 52 includes an intermediate layer 521 and a release agent layer 522, and the intermediate layer 521 is disposed between the base film 51 and the release agent layer 522. That is, in the laminated film 50, a base film 51, an intermediate layer 521, and a release agent layer 522 are laminated in this order.
In FIG. 1, a indicates the surface of the intermediate layer 521 on the base film side, and b indicates the surface of the intermediate layer 521 on the release agent layer side. d indicates the surface of the release agent layer, and c indicates the surface of the release agent layer 522 on the intermediate layer side.
In the laminated film according to this embodiment, it is preferable that the base film and the intermediate layer are in direct contact with each other. In the case of the laminated film 50 shown in FIG. 1, the base film 51 and the intermediate layer 521 are in direct contact, and the intermediate layer 521 and the release agent layer 522 are in direct contact.
FIG. 2A is an example of a cross-sectional view of the laminated film 50A when the laminated film 50 shown in FIG. 1 is stretched in the longitudinal direction (conveyance direction) by the stretching process.
FIG. 2A shows a state in which a plurality of cracks 523 have occurred in the coating layer 52A (intermediate layer 521A and release agent layer 522A) of the stretched laminated film 50A. In the case of FIG. 2A, a plurality of cracks 523 are generated in both the intermediate layer 521A and the release agent layer 522A.

In this embodiment, the stretching process is a process of causing cracks in the coating layer. Creating cracks in the coating layer means that cracks occur in the thickness direction of the coating layer, and preferably cracks that reach the interface with the base film occur (for example, FIG. 2A).
Note that cracks in the thickness direction of the coating layer may occur in at least one of the intermediate layer and the release agent layer, but preferably occur in both the intermediate layer and the release agent layer.
Cracks that occur in the coating layer are initially formed along a direction substantially perpendicular to the stretching direction, and as the coating layer is further stretched, cracks are generated along the stretching direction. When cracks occur in the coating layer, when the laminated film is immersed in hot water in the next process, the area that the hot water infiltrates into the coating layer increases, making it possible to speed up the separation (peeling) of the coating layer. .
In addition, in the laminated film used in Patent Document 1, the laminated film is immersed in hot water without going through a stretching process. ) is considered to slow down the separation (peeling) speed.
It is preferable that by stretching the laminated film, the coating layer on the base film becomes a small piece surrounded by cracks. FIG. 2B is a micrograph showing a state in which cracks have occurred in the coating layer, and is a top view of the laminated film viewed from the coating layer side.
Furthermore, the impact caused when cracks occur in the coating layer may cause partial separation between the base film and the coating layer. In the micrograph of FIG. 2B, the areas where the outer periphery of the polygon appears white are areas where the coating layer has peeled off at the interface with the base film near the cracks, trapping air. If this kind of peeling occurs, when the laminated film is immersed in hot water in the next step, the area of hot water infiltrating the coating layer will increase, which will speed up the separation (peeling) of the coating layer. I can do it.
Moreover, according to the method for removing a coating layer according to the present embodiment, since each step is performed continuously in a roll-to-roll manner, the removal of the coating layer and the winding up of the base film can be performed efficiently.

In the laminated film according to this embodiment, the intermediate layer is preferably hydrophilic and water-insoluble. This will be explained using FIGS. 1 and 2A.
When the intermediate layer is hydrophilic, the effect of this embodiment (the effect that the coating layer can be easily removed from the laminated film) is more effectively achieved. The reason for this is thought to be as follows.
In the laminated film 50 before the stretching process, the intermediate layer 521 is in close contact with the base film 51 mainly due to hydrogen bonds and anchor effects (FIG. 1). In the laminated film 50A after the stretching process, a plurality of cracks 523 occur in the intermediate layer 521A and the release agent layer 522A (FIG. 2A). In the removal process, the laminated film 50A shown in FIG. 2A is immersed in hot water and transported. At that time, if the intermediate layer 521A is hydrophilic, hot water will more easily infiltrate into the interface between the base film 51 and the intermediate layer 521A through the cracks 523, and the Hydrogen bonds and anchoring effects are weakened. As a result, the intermediate layer 521A is more easily peeled off from the base film 51 together with the release agent layer 522A.

When the intermediate layer is water-insoluble, the components of the intermediate layer 521A are suppressed from eluting into hot water. Therefore, since the intermediate layer 521A is water-insoluble, it is possible to prevent contamination of the hot water used in the process of removing the coating layer 52A (removal process), and it becomes easy to reuse the hot water.

In this specification, whether an intermediate layer is "hydrophilic" is determined to be hydrophilic if the contact angle of water on the surface of the intermediate layer on the base film side is 55 degrees or less. do.
In the case of the laminated film 50 shown in FIG. 1, if the contact angle of water on the surface of the intermediate layer 521 on the base film side (in FIG. 1, reference numeral a) is 55 degrees or less, the intermediate layer 521 is hydrophilic.
Further, from the viewpoint of promoting the separability of the base film, the contact angle is preferably 50 degrees or less, more preferably 45 degrees or less. The contact angle is determined when the base film of the intermediate layer is contacted after the base film is separated from the laminated film, that is, after the intermediate layer is brought into contact with water and the interface between the intermediate layer and the base film is peeled off. This value is obtained by measuring the contact angle of water on the surface (peeled surface).

Specifically, the intermediate layer is separated from the base film and the contact angle of water on the surface of the intermediate layer on the base film side is measured by the following method. The obtained value is taken as the contact angle of water on the surface of the intermediate layer on the base film side.
Adhesive tape with a width of 50 mm (manufactured by Nitto Denko Corporation, product name "Polyester Adhesive Tape No. 31B") was pasted on the surface of the release agent layer of the laminated film, and then cut into a size of 50 mm x 50 mm to form a test piece. Create.
Next, a glass beaker with a capacity of 500 mL is filled with 300 mL of warm water, and the entire test piece is immersed in 90° C. warm water and left for 3 hours. After that, it was confirmed that the test piece was separated into a laminate in which the release agent layer and the intermediate layer were integrally supported on the adhesive tape, and a base film, and the release agent layer and the intermediate layer were supported. Remove the adhesive tape from the warm water and dry at room temperature for 24 hours. Thereafter, the contact angle is measured on the surface of the intermediate layer supported on the adhesive tape (the surface of the intermediate layer that was in contact with the surface of the base film). The contact angle is measured by the sessile drop method using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., product name "DM-701") according to JIS R3257:1999. For droplets, use distilled water.

In this specification, whether or not the intermediate layer is "water-insoluble" is determined by the contact angle of water on the release agent layer surface (symbol d in FIG. 1) measured using the following method and the intermediate layer. If the difference between the water contact angle on the base film side surface (in FIG. 1, reference numeral a) is 30 degrees or more, the intermediate layer is determined to be water-insoluble. The difference in contact angle is preferably 40 degrees or more, more preferably 50 degrees or more. If the value of this difference is small, it means that the components constituting the intermediate layer were eluted into water and the partially exposed release agent layer was measured.
Further, the contact angle of water on the surface of the release agent layer is not particularly limited, but is usually 80 degrees or more, preferably 85 degrees or more, and more preferably 90 degrees or more. Further, the upper limit of the contact angle of water on the surface of the release agent layer is usually 150 degrees, preferably 140 degrees, and more preferably 130 degrees.
The contact angle of water on the surface of the release agent layer is measured by the sessile drop method using a contact angle meter (manufactured by Kyowa Kaimen Kagaku Co., Ltd., product name "DM-701") according to JIS R3257:1999. For droplets, use distilled water.

Details of the base film, intermediate layer, and release agent layer will be described later.

The coating layer removal method according to the present embodiment can be carried out using, for example, the coating layer removal apparatus according to the second to fifth embodiments.
First, a coating layer removal apparatus 100 according to a second embodiment will be described.

[Second embodiment]
[Coating layer removal device 100]
FIG. 3 is a schematic diagram of an example of a coating layer removing apparatus 100 according to the second embodiment.
Below, the stretched laminated film may be referred to as the "stretched laminated film", and the stretched coating layer may be referred to as the "stretched coating layer".
The X-axis, Y-axis, and Z-axis in FIG. 3 are orthogonal to each other, and the X-axis and Y-axis are axes within a predetermined plane, and the Z-axis is an axis perpendicular to the predetermined plane.

A coating layer removing device 100 according to the second embodiment is a coating layer removing device 100 that removes a coating layer 52 from a laminated film 50 having a base film 51 and a coating layer 52. A dipping device 30 comprising a feeding device 10 that feeds out the laminated film 50 from the wound roll 1, a stretching device 20 that stretches the fed laminated film 50, and a water tank 32 that immerses the stretched laminated film 50A in hot water HW. and a winding means 40 for winding up the base film 51 taken out from the water tank 32 into a roll.
Further, the removing device 100 includes a foreign matter removing means 70 for removing foreign matter on the base film 51 between the dipping means 30 and the winding means 40.

The laminated film 50 applied to the removal device 100 is preferably a laminated film used for manufacturing ceramic green sheets and after the ceramic green sheets have been peeled off. The ceramic green sheet manufactured in this manner is preferably used for manufacturing a multilayer ceramic capacitor (MLCC).

<Feeding means 10>
The feeding means 10 includes a roll 1 around which the laminated film 50 is wound, a support member (not shown) for rotatably directing the roll 1, and a drive roller (not shown).

<Stretching means 20>
The stretching means 20 includes a first stretching roll 3A, a second stretching roll 3B provided downstream of the first stretching roll 3A, and a circumferential roller that controls the circumferential speed of the first stretching roll 3A and the second stretching roll 3B. It is provided with a speed control means 3C, and a first nip roll 2A and a second nip roll 2B provided opposite to the first stretching roll 3A and the second stretching roll 3B, respectively.
Drive motors M1 and M2 are connected to the respective shaft portions of the first stretching roll 3A and the second stretching roll 3B. The peripheral speed control means 3C controls the peripheral speeds of the first stretching roll 3A and the second stretching roll 3B by controlling these drive motors M1 and M2. The circumferential speed control means 3C is, for example, a computer.

It is preferable that the stretching means 20 includes a heating means for heating the laminated film 50.
Although the heating means is not particularly limited, examples thereof include an infrared heater, a halogen heater, a UV lamp, and a hot air generator.
The heating means is preferably disposed on the base film 51 side of the laminated film 50 and heats the laminated film 50 from the base film 51 side, from the viewpoint of making it easier to stretch the base film. The heating means may be disposed on the coating layer 52 side of the laminated film 50 and heat the laminated film 50 from the coating layer 52 side.
In the case of FIG. 3, a heating means 60 for heating the laminated film 50 from the base film 51 side is provided between the first stretching roll 3A and the second stretching roll 3B.

<Immersion means 30>
The dipping means 30 includes a water tank 32 for dipping the stretched laminated film 50A in hot water HW. The water tank 32 is a heat-resistant water tank.
In the case of FIG. 3, the immersion means 30 includes a water tank 32 that stores hot water HW, and a plurality of guide rolls 31 that are placed in the hot water HW and that wrap around and convey the stretched laminated film 50A.
The number of guide rolls 31 arranged in the hot water HW is appropriately determined according to the size of the water tank. The number of guide rolls 31 is usually two or more.
Preferably, the immersion means 30 includes a heating means for adjusting the hot water to a predetermined temperature.
The heating means may be provided inside the water tank 32 (for example, FIG. 6) or may be provided outside the water tank 32. A known heater can be used as the heating means.
Preferably, the dipping means 30 includes a water flow guiding means for guiding the coating layer dregs that have fallen off from the base film and are released into the hot water HW to a predetermined position in the water tank 32.
The predetermined position refers to a position where the residue of the coating layer can be easily collected, and includes, for example, the upper end of the water tank 32.
Examples of the water flow guide means include rotary vanes, pumps, and the like.
In the case of FIG. 3, the water flow guide means includes a plurality of guide rolls 31 arranged when the water surface is viewed from the top surface of the water tank 32 (when viewed from the direction opposite to the Z-axis direction (-Z-axis direction)). It is preferable to direct the coating layer dregs to areas that are not covered (for example, the upper end of the water tank 32).
By providing the dipping means 30 with a water flow guiding means, the residue of the coating layer can be efficiently collected.

<Foreign matter removal means 70>
The foreign matter removing means 70 is provided between the dipping means 30 and the winding means 40, and is a means for removing foreign matter from the base film 51 taken out from the water tank 32.
The foreign matter is, for example, a coating layer remaining on the base film 51 and water droplets attached to the base film 51.
Although the foreign matter removing means 70 is not particularly limited, examples thereof include an air knife, a dryer, and the like. The foreign matter removing means 70 may be disposed at least on the side where the coating layer 52A is provided with respect to the base film 51.
In the case of FIG. 3, the foreign matter removing means 70 is an air knife 71, which is provided facing each other with the base film 51 in between. The air knife 71 blows air onto both sides of the base film 51 taken out from the water tank 32 to remove the coating layer remaining on the base film 51 and water droplets adhering to the base film 51.
When the foreign matter removing means is a dryer, hot air is blown onto the base film 51.

<Winding means 40>
The winding means 40 includes a winding roll 4 for winding up the base film 51 taken out from the water tank 32 into a roll shape, a support member (not shown) that rotatably supports the winding roll 4, and a drive roller. (not shown).

When the coating layer removal device 100 according to the second embodiment is used, the coating layer removal method according to the first embodiment is performed, for example, through the following steps.

<Preparation process>
The preparation step is a step of preparing a roll 1 around which a laminated film 50 having a base film 51 and a coating layer 52 is wound.
The preparation process may be a process of simply preparing a previously manufactured roll (roll 1 around which the laminated film 50 is wound), or a process of manufacturing the roll 1 around which the laminated film 50 is wound. There may be.
The laminated film 50 is preferably used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.

<Feeding process>
The unwinding process is a process of unwinding the laminated film 50 from the roll 1 around which the laminated film 50 is wound.
In the case of FIG. 3, the laminated film 50 fed out from the roll 1 by the feeding means 10 is conveyed toward the first nip roll 2A (in the X-axis direction in FIG. 3).
In FIG. 3, an enlarged view of the laminated film in region R1 is shown, for example, by rotating FIG. 1 by 180 degrees in the vertical direction.
In the region R1 of FIG. 3, the laminated film 50 unrolled from the roll 1 has a base film 51, an intermediate layer 521, and a release agent layer 522 laminated in this order in the Z-axis direction.

<Stretching process>
The stretching process is a process of stretching the laminated film 50.
In the case of FIG. 3, the laminated film 50 fed out from the roll 1 passes through the first nip roll 2A and the first stretching roll 3A while being curved in a substantially S-shape, and then passes from the first stretching roll 3A to the second stretching roll 3B. The laminated film 50 is stretched in the region R2 where it is transported. Due to the stretching process, cracks occur in the coating layer 52. In FIG. 3, an enlarged view of the stretched laminated film 50A in region R2 is shown, for example, by rotating FIG. 2A by 180 degrees in the vertical direction. Moreover, the state of the laminated film 50A after stretching in region R2 viewed from the Z axis is shown, for example, in FIG. 2B.
As a method for stretching the laminated film 50, for example,
- A method of controlling the circumferential speed of the second stretch roll 3B provided on the downstream side of the conveyance path to be faster than the circumferential speed of the first stretch roll 3A provided on the upstream side of the conveyance path; A method in which one or more other stretching rolls are provided between the first stretching roll 3A and the second stretching roll 3B, and the laminated film 50 is conveyed while being wound around the first stretching roll 3A, the other stretching rolls, and the second stretching roll 3B. etc.
As a method for stretching the laminated film 50, the circumferential speed of the second stretching roll 3B provided on the downstream side of the conveyance path is made faster than the circumferential speed of the first stretching roll 3A provided on the upstream side of the conveyance path. A method of controlling this is preferable.

The stretching step is preferably performed while heating the laminated film 50.
In the case of FIG. 3, in region R2 where the laminated film 50 is conveyed from the first stretching roll 3A to the second stretching roll 3B, the laminated film 50 is heated using the heating means 60 from the base film 51 side.
By performing the stretching process while heating the laminated film 50, cracks are more likely to occur in the coating layer 52 (intermediate layer 521 and release agent layer 522) compared to when the stretching process is performed at room temperature.
The heating in the stretching step is more effective when the laminated film 50 is, for example, a laminated film from which a ceramic green sheet has been peeled off.
The laminated film after the ceramic green sheet has been peeled off, that is, the used laminated film, is punched out for each ceramic green sheet, and minute cuts may occur on the remaining surface. The laminated film is likely to break starting from the cut. Therefore, when using a used laminated film, the laminated film is less likely to break by performing the stretching process while heating the laminated film. As a result, even when using a laminated film after the ceramic green sheet formed on the laminated film is cut to a predetermined size and the ceramic green sheet is peeled off, it is possible to remove the coating layer and remove the base material using a roll-to-roll method. Film winding can be completed without any problem.

The heating temperature and heating time when heating the laminated film 50 are determined by the materials of the base film 51 and coating layer 52 (intermediate layer 521 and release agent layer 522).

The laminated film 50 is preferably heated at a temperature equal to or higher than the glass transition temperature _Tg of the base film 51 for the following reasons.
The glass transition temperature Tg ₁ of the base film 51 in the laminated film 50 and the glass transition temperature Tg ₂ of the coating layer 52 are determined in accordance with the method specified in JIS K7121 (2012), and are determined using a differential scanning calorimeter ( DSC). The temperature at the time of stretching is preferably set to a glass transition temperature Tg of ₁ or more of the base film 51, in order to make it easier to stretch the base film 51 without breaking it, while also making it easier to break the coating layer 52. More preferably, the glass transition temperature Tg of the film 51 is ₁ or more and the glass transition temperature Tg of the coating layer 52 is ₂ or less.

<Removal process>
The removal step is a step in which the stretched laminated film 50A is immersed in hot water HW in the water tank 32 to remove the coating layer (coating layer 52A after stretching) from the laminated film 50A.
The laminated film 50A stretched in the stretching process is curved into a substantially S-shape through the second stretching roll 3B and the second nip roll 2B, passes through the guide roll 31a, and then is immersed in the hot water HW in the water tank 32.
The laminated film 50A is sequentially wound around a plurality of guide rolls 31 provided in the hot water HW and conveyed in the hot water HW. During this conveyance process, the coating layer (coating layer 52A after stretching) falls off from the base film and is released into the hot water HW.
The temperature of the hot water HW is, for example, preferably 40°C or higher, more preferably 60°C or higher. Further, the temperature is preferably less than 100°C, and more preferably 98°C or less.

<Foreign matter removal process>
In the coating layer removal method according to the first embodiment, after the base film from which the coating layer has been removed is taken out from hot water and before the step of winding up the base film into a roll, foreign particles on the base film are removed. The method further includes a step of removing foreign matter (hereinafter also referred to as a foreign matter removal step).
In the case of FIG. 3, the foreign matter removal step is performed by blowing air from the outlet (not shown) of the air knife 71 (an example of the foreign matter removing means 70) onto both sides of the base film 51 taken out from the hot water. This is a step of removing foreign matter on the film 51.
By performing the foreign matter removal step, the coating layer remaining on the base film 51 and the water droplets adhering to the base film 51 are removed.

<Wind-up process>
The winding process is a process of winding up the base film 51 from which the coating layer (coating layer 52A after stretching) has been removed into a roll.
In the case of FIG. 3, the base film 51 from which foreign matter has been removed by the air knife 71 passes through the guide roll 31b and is then wound up into a roll by the winding roll 4.

[Third embodiment]
The coating layer removal apparatus according to the third embodiment is different from the removal apparatus 100 according to the second embodiment except that the dipping means and the foreign matter removing means are changed to a dipping means 30A and a foreign matter removing means 70A shown in FIG. This is similar to the second embodiment.
In the third embodiment, differences from the second embodiment will be mainly explained, and explanations of similar items will be omitted or simplified by giving the same reference numerals.
FIG. 4 is a schematic diagram of an example of a dipping means and a foreign matter removing means according to the third embodiment.

<Immersion means 30A>
The dipping means 30A includes means 80 for scraping off the coating layer (coating layer 52A after stretching) from the base film 51 in the water tank 32.
In the case of FIG. 4, the scraping means 80 is a blade 81.
The blade 81 is provided on one side of the stretched laminated film 50A (the side on which the stretched coating layer 52A is provided) so as to come into contact with the laminated film 50A.
Although the arrangement position of the blade 81 is not particularly limited, it is preferable to provide the blade 81 on the downstream side of the conveyance path in the water tank 32 as shown in FIG. By providing the blade 81 on the downstream side of the conveyance path, the coating layer can be scraped off after sufficient immersion in water, and the number of surfaces to which scraps of the scraped coating layer are likely to adhere can be reduced. Two or more blades 81 may be provided. The material of the blade 81 is not particularly limited.

<Foreign matter removal means 70A>
In the case of FIG. 4, the foreign matter removing means 70A includes an air knife 71 and a high-pressure water nozzle 72.
The high-pressure water nozzle 72 sprays high-pressure water onto both sides of the base film 51 discharged from the water tank 32 to remove the coating layer remaining on the base film 51.

When the coating layer removal device according to the third embodiment is used, the coating layer removal method according to the first embodiment is performed in the same manner as the second embodiment except for the following steps.

<Removal process>
The removal step is a step of immersing the stretched coating layer 52A in hot water HW and then scraping off the coating layer 52A from the base film 51 using a blade 81 (an example of the scraping means 80).
In the stretched laminated film 50A, the coating layer (stretched coating layer 52A) falls off from the base film during the process of conveying in hot water HW, but in the case of FIG. is scraped off from the base film 51. This makes it more difficult for the coating layer 52A to remain on the base film 51.

<Foreign matter removal process>
In the case of FIG. 4, the foreign matter removal process is performed using an air knife 71 and a high-pressure water nozzle 72.
First, the coating layer remaining on the base film 51 is removed by injecting a high-pressure water stream from the high-pressure water nozzle 72 onto both sides of the base film 51 taken out from the hot water. Subsequently, water droplets adhering to the base film 51 are removed by blowing air onto both sides of the base film 51 from an air outlet (not shown) of the air knife 71.

[Fourth embodiment]
[Coating layer removal device]
The coating layer removing device according to the fourth embodiment is the same as the third embodiment except that the foreign matter removing means is changed to foreign matter removing means 70B shown in FIG. 5 in the removing device according to the third embodiment.
In the fourth embodiment, the explanation will focus on the differences from the third embodiment, and the explanation of the same items will be omitted or simplified by giving the same reference numerals, etc.
FIG. 5 is a schematic diagram of an example of a dipping means and a foreign matter removing means according to the fourth embodiment.

<Foreign matter removal means 70B>
In the case of FIG. 5, the foreign matter removing means 70B includes a high-pressure water nozzle 72 and a pair of water absorption rolls 73a and 73b provided downstream of the high-pressure water nozzle 72 in the conveyance path. A pair of metal rolls 74a, 74b are provided on the water absorption rolls 73a, 73b to face each other, respectively.
A pair of water absorption rolls 73a and 73b are provided facing each other with the base film 51 discharged from the water tank 32 in between.
The materials of the water absorption rolls 73a, 73b and the metal rolls 74a, 74b are not particularly limited.

When the coating layer removal apparatus according to the fourth embodiment is used, the same steps as in the third embodiment are performed except for the following steps.

<Foreign matter removal process>
In the case of FIG. 5, the foreign matter removal step is performed using a high-pressure water nozzle 72 and water absorption rolls 73a and 73b.
First, similarly to the third embodiment, the coating layer remaining on the base film 51 is removed by injecting a high-pressure water stream from the high-pressure water nozzle 72 onto both sides of the base film 51 taken out from the hot water. . Subsequently, the water droplets adhering to the base film 51 are absorbed by the water absorption rolls 73a and 73b. The water absorbed by the water absorption rolls 73a, 73b is pushed out by the pressure of the metal rolls 74a, 74b against the water absorption rolls 73a, 73b, respectively. In the case of FIG. 4, the water pushed out from the water absorption rolls 73a and 73b drips into the water tank 32.

[Fifth embodiment]
[Coating layer removal device]
The coating layer removal apparatus according to the fifth embodiment is the same as the fourth embodiment except that the immersion means 30A is changed to the immersion means 30C shown in FIG. 6 in the removal apparatus according to the fourth embodiment.
In the fifth embodiment, the explanation will focus on the differences from the fourth embodiment, and the explanation of the same items will be omitted or simplified by giving the same reference numerals.
FIG. 6 is a schematic diagram of an example of a dipping means and a foreign matter removing means according to the fifth embodiment.

<Immersion means 30C>
The immersion means 30C includes a means 80 for scraping off the coating layer (coating layer 52A after stretching) from the base film 51 in the water tank 32, and a means 80 for overflowing hot water HW from the upper part of the water tank 32 to remove the coating layer (coating layer 52A after stretching) from the laminated film 50A. A structure (hereinafter also referred to as a discharge structure) for discharging the dregs of the coating layer 52A to the outside of the water tank 32 is provided.
In the case of FIG. 6, the scraping means 80 is a wire brush 82. The wire brush 82 is provided facing the guide roll 31c with the laminated film (stretched laminated film 50A) interposed therebetween. The wire brush 82 is provided on one side of the laminated film 50A (the side on which the coating layer 52A is provided) so as to come into contact with the laminated film 50A. Although the arrangement position of the wire brush 82 is not particularly limited, it is preferable to provide it on the downstream side of the conveyance path in the water tank 32 as shown in FIG. By providing the wire brush 82 on the downstream side of the conveyance path, the coating layer can be scraped off after sufficient immersion in water, and the number of surfaces on which scraps of the scraped coating layer are likely to adhere can be reduced. . Two or more wire brushes 82 may be provided.
Further, the immersion means 30C includes a heating means 95 that adjusts the hot water to a predetermined temperature. The heating means 95 is provided inside the water tank 32.
The discharge structure includes a coating separation tank 90 provided adjacent to the water tank 32, a circulation path 93 through which hot water discharged from the drain port 93A of the coating separation tank 90 circulates, and a circulation pump P that circulates the hot water. has.
The coating separation tank 90 has a filter 92 for filtering the coating layer dregs and a drain port 93A.
The circulation path 93 connects the drain port 93A of the coating separation tank 90 and the inlet 93B arranged at the upper part of the water tank 32.
The pore diameter of the filter 92 is preferably 1 μm or more and 100 μm or less.

When the coating layer removal apparatus according to the fifth embodiment is used, the steps are performed in the same manner as in the fourth embodiment except for the following steps.

<Removal process>
The removing step is a step of immersing the stretched coating layer 52A in hot water HW and then scraping off the coating layer 52A from the base film 51 using a wire brush 82 (an example of the scraping means 80).
In the stretched laminated film 50A, the coating layer (stretched coating layer 52A) falls off from the base film during the process of conveying in hot water HW, but in the case of FIG. 6, the coating layer is further removed by a wire brush 82. 52A is scraped off from the base film 51. This makes it more difficult for the coating layer 52A to remain on the base film 51.

<Coating layer discharge process>
The coating layer removal method according to the fifth embodiment further includes a step (coating layer discharge step) of causing hot water to overflow from the upper part of the aquarium and discharging the coating layer residue that has fallen off from the laminated film to the outside of the aquarium.
Methods for overflowing hot water include, for example, a method of injecting hot water or cold water into the aquarium from an overflow injection pipe, a method of circulating hot water discharged from the aquarium and supplying the hot water to the aquarium again, and these methods. Examples include a method of using a combination of methods.
In the case of FIG. 6, the coating layer residue that has fallen off from the laminated film (stretched laminated film 50A) overflows from the water tank 32 together with the hot water HW and is discharged into the coating separation tank 90 (coating layer discharge step).
In the coating separation tank 90, the residue of the coating layer is filtered by a filter 92. The hot water after being filtered by the filter 92 is discharged from the drain port 93A of the coating separation tank 90, flows through the circulation path 93, and is again supplied to the water tank 32 from the inlet 93B.

According to the fifth embodiment, the hot water used in the removal process can be reused in a simple manner. In addition, when the intermediate layer is water-insoluble, the components of the intermediate layer are prevented from eluting into hot water, so that contamination of the hot water can also be prevented.

[Modified example of embodiment]
For example, in the removing device according to the third embodiment or the fourth embodiment, the blade 81 as the means 80 for scraping off the coating layer (coating layer 52A after stretching) from the base film 51 is used in the fifth embodiment. The wire brush 82 may be used instead.
As shown in FIG. 6, the wire brush 82 is preferably provided facing the guide roll 31c with the laminated film (stretched laminated film 50A) interposed therebetween.
In the removing devices according to the second to fifth embodiments, the heating means 60 may be provided between the feeding means 10 and the first stretching roll 3A. That is, it is also preferable that the heating means 60 be arranged to heat the laminated film 50 before the laminated film 50 is stretched. In this case, the removal method according to the first embodiment further includes a step of heating the laminated film 50 after the feeding step and before the stretching step. By heating the laminated film 50 before carrying out the stretching process, cracks are likely to occur in the coating layer 52 (intermediate layer 521 and release agent layer 522).

In the removing apparatus according to the second embodiment to the fifth embodiment, the laminated film 50 fed out from the roll 1 is moved toward the Z-axis direction by the base film 51, the intermediate layer 521, and the release agent in the region R1 of FIG. Although this is the direction in which the layers 522 are stacked in this order, the stacking order may be reversed upside down.
In the removal device according to the third to fifth embodiments, the scraping means 80 (blade 81 or wire brush 82) is provided on one side of the stretched laminated film 50A so as to come into contact with the laminated film 50A. However, it is not limited to this. For example, the scraping means 80 may be provided on both sides of the stretched laminated film 50A so as to be in contact with the laminated film 50A.
In the removal apparatus according to the third to fifth embodiments, the scraping means 80 (blade 81 or wire brush 82) is provided on the downstream side of the conveyance path in the water tank 32, but is not limited to this, for example. , may be provided on the upstream side or near the center of the transport path within the water tank 32.
The invention is not limited to the embodiments described above. The present invention may include modifications, improvements, etc. within the scope that can achieve the objects of the present invention.

The structure of the laminated film used in the coating layer removal method according to the first embodiment and the coating layer removal apparatus according to the second to fifth embodiments will be described.

[Laminated film]
The laminated film used in any of the embodiments described above includes a base film and a coating layer. The coating layer includes an intermediate layer and a release agent layer. The intermediate layer is arranged between the base film and the release agent layer.
The intermediate layer may be a single layer, or may be a multilayer consisting of two or more intermediate layers of the same or different types. The release agent layer may be a single layer, or may be a multilayer consisting of two or more release agent layers of the same or different types.
The laminated film preferably has a structure in which the base film and the intermediate layer are directly laminated, from the viewpoint of removing the coating layer from the laminated film and making it easy to recover the remaining base film. Here, "direct lamination" refers to a configuration in which, for example, there is no other layer between the base film and the intermediate layer, and the layers are in direct contact with each other.
Further, in one embodiment of the laminated film, the base film, the intermediate layer, and the release agent layer may be directly laminated in this order. That is, the structure may be such that there is no other layer between the base film, the intermediate layer, and the release agent layer, and the layers are in direct contact with each other.

<Base film>
As the base film, a resin film is used in which a resin component that is scheduled to be collected is formed into a film.
Examples of resin films include polyester films such as polyethylene terephthalate film, polybutylene terephthalate, and polyethylene naphthalate; polyolefin films such as polyethylene film and polypropylene film; polyimide film; polyamide film; polycarbonate film; polyacetate film; ethylene-vinyl acetate copolymer. Ethylene-(meth)acrylic acid copolymer film; ethylene-(meth)acrylic acid ester copolymer film; cycloolefin polymer film; polyurethane film; polyphenylene sulfide film; cellophane; etc. can be used. can.
Among these, polyester films are preferred from the viewpoint of heat resistance and strength. As the polyester film, from the viewpoint of easy recovery and recycling of the resin, a polyester film containing any one of polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as a main component is preferable.
Further, the resin film may contain known fillers, colorants, antistatic agents, antioxidants, organic lubricants, catalysts, and the like. Further, the resin film may be transparent or may be colored as desired. Furthermore, at least one surface of the base film may be subjected to surface treatment such as sputtering, corona discharge, flame, ultraviolet irradiation, electron beam irradiation, and etching treatment such as oxidation, as necessary.

The thickness of the base film is not particularly limited, but from the viewpoint of strength and rigidity, it is preferably 10 μm or more and 500 μm or less, more preferably 15 μm or more and 300 μm or less, and even more preferably 20 μm or more and 200 μm or less.

<Release agent layer>
The release agent layer is preferably a layer formed from a release agent composition.
The release agent composition used to form the release agent layer is not particularly limited as long as it has release properties, and examples include silicone compounds; fluorine compounds; long-chain alkyl group-containing compounds; olefin resins, diene A release agent composition having a thermoplastic resin material such as a thermoplastic resin as a main component can be used. Furthermore, it is preferable to use a release agent composition containing an energy ray-curable or thermosetting resin as a main component. These stripping agent compositions may be used alone or in combination of two or more.

In a release agent composition containing a silicone compound as a main component, examples of the silicone compound include silicone compounds having organopolysiloxane as a basic skeleton. Further, examples of the silicone compound include thermosetting silicone compounds such as addition reaction type and condensation reaction type; energy ray curing type silicone compounds such as ultraviolet ray curing type and electron beam curing type; and the like.

In a release agent composition containing a fluorine compound as a main component, examples of the fluorine compound include fluorine silicone compounds, fluorine boron compounds, and poly(perfluoroalkylene ether) chain-containing compounds.

In a release agent composition containing a long-chain alkyl group-containing compound as a main component, the long-chain alkyl group-containing compound may be, for example, a polyvinyl carbamate obtained by reacting a long-chain alkyl isocyanate with a polyvinyl alcohol-based polymer. , an alkyl urea derivative obtained by reacting polyethyleneimine with a long-chain alkyl isocyanate, or a copolymer of a long-chain alkyl (meth)acrylate. Furthermore, a long-chain alkyl-modified alkyd resin using a long-chain fatty acid as a modifier may be used as an alkyd resin obtained by a condensation reaction of a polyhydric alcohol and a polybasic acid.

A release agent composition containing an energy ray curable resin as a main component includes, for example, an energy ray curable compound having a reactive functional group selected from a (meth)acryloyl group, an alkenyl group, and a maleimide group, and a polyorganosiloxane. Preferably, those containing In the release agent layer formed by this release agent composition, an energy ray-curable compound and a polyorganosiloxane having mutually different molecular structures, polarities, and molecular weights are used, so components derived from the polyorganosiloxane are removed before curing. becomes segregated near the outer surface of the release agent layer, and is then hardened by energy rays to fix the segregation. Thereby, the releasability of the release agent layer can be improved. The release agent composition containing an energy ray curable resin as a main component may further contain a photopolymerization initiator.

Examples of release agent compositions containing a thermosetting resin as a main component include release agent compositions containing a melamine resin as a main component and release agent compositions containing an epoxy resin as a main component. Examples of release agent compositions containing a melamine resin as a main component include compositions containing a melamine resin as a main ingredient, an acid catalyst for thermally curing the melamine resin, and a polyorganosiloxane that imparts release properties to the release agent layer. In addition, a release agent composition containing an epoxy resin as a main component includes an epoxy resin as a main ingredient, an acidic or basic thermosetting catalyst for thermally curing the epoxy resin, and a polyorganosiloxane that imparts releasability to the release agent layer. Examples include compositions containing. Before curing, components derived from polyorganosiloxane become segregated near the outer surface of the release agent layer, and then harden to fix the segregation. Thereby, the releasability of the release agent layer can be improved.

Furthermore, the release agent layer may contain other additives in addition to the above-mentioned resin components. Examples of other additives include anti-aging agents, light stabilizers, flame retardants, conductive agents, antistatic agents, and plasticizers.

The thickness of the release agent layer can be selected as appropriate and is not particularly limited, but for example, preferably 0.02 μm or more and 5 μm or less, more preferably 0.03 μm or more and 2 μm or less, and still more preferably 0.03 μm or more and 5 μm or less. 05 μm or more and 1.5 μm or less.

<Middle layer>
The intermediate layer is a layer made of a silane compound that is hydrophilic and water-insoluble, and exhibits polycondensation properties by hydrolysis, from the viewpoint of easier removal of the coating layer from the surface of the intermediate layer on the base film side. It is preferable that there be.

The silane compound preferably contains at least one kind selected from a tetrafunctional silane compound represented by the following general formula (a) and an oligomer thereof as a main component.
Si(OR) _p (X) _4-p (a)
[In general formula (a), R represents an alkyl group, and X represents a halogen atom. When a plurality of R's exist, the plurality of R's may be the same or different from each other. When a plurality of Xs exist, the plurality of Xs may be the same or different from each other. p represents an integer from 0 to 4. ]
The number of carbon atoms in the alkyl group is preferably 1 or more and 4 or less.
The silane compounds represented by the general formula (a) may be used alone or in combination of two or more.

The silane compound represented by the general formula (a) preferably includes a silane compound in which p in the general formula (a) is 4.
The silane compound in which p in the general formula (a) is 4 (ie, the tetrafunctional silane compound) is preferably a tetraalkoxysilane. More preferable specific examples of the tetraalkoxysilane include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, and tetrabutoxysilane. Among these, from the viewpoint of availability and reactivity in hydrolysis reaction, at least one of tetramethoxysilane and tetraethoxysilane, or a mixture of tetramethoxysilane and tetraethoxysilane is preferred.

Commercially available products can also be used as the hydrolyzed polycondensates of the silane compounds, and preferred examples of the commercially available products include "Colcoat (registered trademark) N-103X", "Colcoat (registered trademark) PX", and Tetra. "Methylsilicate 51" is an average tetramer oligomer of methoxysilane, "Methylsilicate 53A" is an average heptamer oligomer of tetramethoxysilane, "Ethylsilicate 40" is an average pentamer oligomer of tetraethoxysilane, "Ethylsilicate 48" which is an average 10-mer oligomer of tetraethoxysilane, and "EMS-485" which is a mixture of an average 10-mer oligomer of tetramethoxysilane and an average 10-mer oligomer of tetraethoxysilane (both , manufactured by Colcoat Co., Ltd.).

The thickness of the intermediate layer is preferably 0.01 μm or more and 1 μm or less, more preferably 0.03 μm or more and 0.5 μm or less, and even more preferably 0.01 μm or more and 1 μm or less, from the viewpoint of easy water infiltration when the intermediate layer comes into contact with water. is 0.05 μm or more and 0.3 μm or less.

Since the laminated film used in each embodiment of the present invention has a hydrophilic and water-insoluble intermediate layer, the removed coating layer residue has a structure having a release agent layer surface and a hydrophilic intermediate layer surface. becomes. When the residue with this structure is immersed in water, the release agent layer surface faces the air due to surface tension, and the intermediate layer surface faces the water, resulting in stability. In other words, debris with this configuration is more likely to exist at the boundary between water and air than in water. Here, since the coating layer scum is an extremely thin film, it is thought that even if the density is a little high, the buoyancy due to surface tension will prevail, and since the intermediate layer is water-insoluble, it can continue to float on the water surface.

The laminated film used in each embodiment is generally used for the purpose of protecting the surfaces of other functional sheets and various parts used for specific applications during the manufacture, transportation, and storage of these functional sheets and various parts. used in After actually fulfilling the role of protecting these parts, etc., they are often peeled off from the surface and discarded. Therefore, by using the laminated film, the coating layer and the base film can be easily separated from the laminated film, so this application has a high degree of contribution from the viewpoint of resource conservation and environmental protection.

DESCRIPTION OF SYMBOLS 1...roll, 2A...first nip roll, 2B...second nip roll, 3A...first stretching roll, 3B...second stretching roll, 3C...peripheral speed control means, 4...winding roll, 10...feeding out means, 20... Stretching means, 30, 30A, 30C... Immersion means, 31, 31a, 31b, 31c... Guide roll, 32... Water tank, 40... Winding means, 50, 50A... Laminated film, 51... Base film, 52, 52A... Coating layer, 60... Heating means, 70, 70A, 70B... Foreign matter removing means, 71... Air knife, 72... High pressure water jet nozzle, 73a, 73b... Water absorption roll, 74a, 74b... Metal roll, 80... Scraping means, 81 ...Blade, 82...Wire brush, 90...Coating separation tank, 92...Filter, 93...Circulation path, 93A...Drain port, 93B...Inlet, 95...Heating means, 100...Removal device, 521, 521A...Intermediate layer, 522, 522A... Release agent layer, 523... Crack.

Claims (14)

1. a step of preparing a roll wound with a laminated film having a base film and a coating layer;
   Paying out the laminated film from the roll;
   a step of stretching the unrolled laminated film;
   removing the coating layer from the laminated film by immersing the stretched laminated film in warm water in a water tank;
   a step of winding up the base film from which the coating layer has been removed into a roll;
   The coating layer includes an intermediate layer and a release agent layer,
   the intermediate layer is disposed between the base film and the release agent layer,
   How to remove coating layer.
2. The step of removing the coating layer is a step of immersing the stretched laminated film in the warm water and then scraping off the coating layer from the base film.
   The method for removing a coating layer according to claim 1.
3. The method further comprises a step of causing the hot water to overflow from the upper part of the water tank and discharging the residue of the coating layer that has fallen off from the laminated film to the outside of the water tank.
   The method for removing a coating layer according to claim 1 or 2.
4. The step of stretching the laminated film is performed while heating the laminated film.
   The method for removing a coating layer according to claim 1 or 2.
5. After the base film from which the coating layer has been removed is taken out from the hot water and before the step of winding up the base film into a roll, the method further includes the step of removing foreign matter on the base film.
   The method for removing a coating layer according to claim 1 or 2.
6. The base film and the intermediate layer are in direct contact with each other,
   The method for removing a coating layer according to claim 1 or 2.
7. the intermediate layer is hydrophilic and water-insoluble;
   The method for removing a coating layer according to claim 1 or 2.
8. The laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
   The method for removing a coating layer according to claim 1 or 2.
9. A coating layer removal device for removing the coating layer from a laminated film having a base film and a coating layer,
   A feeding means for feeding out the laminated film from a roll around which the laminated film is wound;
   Stretching means for stretching the fed-out laminated film;
   immersion means comprising a water tank for immersing the stretched laminated film in warm water;
   a winding means for winding the base film taken out from the water tank into a roll;
   Coating layer removal equipment.
10. The immersion means includes means for scraping off the coating layer from the base film in the water tank,
    The scraping means is a blade or a wire brush.
    The coating layer removal device according to claim 9.
11. The immersion means has a structure that causes the warm water to overflow from the upper part of the water tank and discharges the coating layer residue that has fallen off from the laminated film to the outside of the water tank.
    The coating layer removal device according to claim 9 or 10.
12. The stretching means includes a heating means for heating the laminated film.
    The coating layer removal device according to claim 9 or 10.
13. A foreign matter removing means for removing foreign matter on the base film is provided between the dipping means and the winding means;
    The coating layer removal device according to claim 9 or 10.
14. The laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled off.
    The coating layer removal device according to claim 9 or 10.

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