WO2024058133A1 - Coating layer removal method and coating layer removal device - Google Patents

Abstract

This coating layer removal method includes: a step for delivering, from a first roll (1), a first laminated film (50) having a first base film and a first coating layer; a step for delivering a second film (e.g., second laminated film (50A)) from a second roll (1A); a step for causing a surface of the first laminated film (50) on the side of the first coating layer to face one surface of the second film, and bringing the surfaces into contact with each other; a step for stretching the first laminated film (50) and the second film; a step for releasing the contact between the surfaces; a step for removing the first coating layer by immersing the contact-released first laminated film (500) into process water (HW) inside a water tank (32); and a first winding step for winding up the first base film (51), wherein the first coating film includes a first intermediate layer and a first 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.
In order to promote the regeneration of the base film (substrate film), there is a need for a technology that can more easily remove the coating layer from the laminated film.

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 first roll around which a first laminated film having a first base film and a first coating layer is wound, and a second roll around which a second film is wound. a step of preparing, a step of feeding out the first laminated film from the first roll, a step of feeding out the second film from the second roll, and a step of feeding the first laminated film of the fed out first laminated film. a step of bringing the side surface of the first coating layer and one surface of the unrolled second film into contact with each other in a facing manner, and with the first laminated film and the second film in contact with each other; , a step of stretching the first laminate film and the second film, a step of releasing contact between the first laminate film and the second film, and a step of releasing the first laminate film from contact. a first removal step of removing the first coating layer from the first laminated film by immersing the film in treated water in a water tank; and a first removal step of removing the first coating layer from the first laminated film; a first winding step of winding the base film into a roll, the first coating layer includes a first intermediate layer and a first release agent layer, and the first laminated film A method for removing a coating layer in , wherein the first intermediate layer is disposed between the first base film and the first release agent layer.

[2] The first removing step is a step of immersing the first laminated film from which contact has been released in the treated water, and then scraping off the first coating layer from the first base film. The method for removing a coating layer according to [1] above.

[3] [1] above, further comprising the step of overflowing the treated water from the upper part of the water tank and discharging the residue of the first coating layer that has fallen off from the first laminated film to the outside of the water tank. Or the method for removing a coating layer according to [2].

[4] After the first base film from which the first coating layer has been removed is taken out from the treated water and before the first winding step, on the first base film The method for removing a coating layer according to any one of [1] to [3] above, further comprising a first foreign matter removal step of removing foreign matter.

[5] The coating layer removal method according to any one of [1] to [4], wherein the stretching step is performed while heating the first laminated film and the second film.

[6] The second film is a second laminated film, and the second laminated film has a second base film and a second coating layer, and the second laminated film has a second base film and a second coating layer. includes a second intermediate layer and a second release agent layer, and in the second laminated film, the second intermediate layer is between the second base film and the second release agent layer. and the contacting step is to make the surface of the first laminate film on the first coating layer side and the surface of the second laminate film on the second coating layer side face each other. After the step of releasing the contact, the second multilayer film from which the contact has been released is immersed in treated water in the water tank, thereby separating the second multilayer film from the second multilayer film. The method further comprises a second removing step of removing the second coating layer, and a second winding step of winding the second base film from which the second coating layer has been removed into a roll shape. The method for removing a coating layer according to any one of [1] to [5].

[7] A step of further feeding out one or more third laminated films having a third base film and a third coating layer, and a step in which the surface of the third coating layer of the third laminated film is on the outside. a step of stacking and contacting one or more of the third laminated films, the first laminated film, and the second film so that the first laminated film and the second laminated film Stretching the first laminated film, the second film, and the one or more third laminated films while the film No. 2 and one or more of the third laminated films are in contact with each other; , releasing the contact between the first laminated film, the second film, and one or more of the third laminated films after stretching; a third removing step of removing the third coating layer from the third multilayer film by immersing the multilayer film in treated water in the water tank; and a third removal step of removing the third coating layer from the third multilayer film; and a third winding step of winding up the base film of No. 3 into a roll shape.

[8] The method for removing a coating layer according to any one of [1] to [7], wherein the first intermediate layer is hydrophilic and water-insoluble.

[9] The first laminated film is a laminated film with a ceramic green sheet, and a ceramic green sheet is attached to the side of the first coating layer opposite to the first base film. The method for removing a coating layer according to any one of [1] to [8] above.

[10] A first feeding means that feeds out the first laminated film from a first roll around which a first laminated film having a first base film and a first coating layer is wound; a second feeding means for feeding out the second film from a second roll around which the film No. 2 is wound; a surface of the fed first laminated film on the side of the first coating layer; contacting means for bringing one side of the second film, which has been removed, into contact with the first laminate film and the second film in a state where the first laminate film and the second film are in contact with each other; a stretching means for stretching the film of No. 2; a contact release means for releasing the contact between the first laminated film and the second film; and immersing the first laminated film from which the contact has been released in treated water. A coating layer removal device comprising: a dipping device having a water tank; and a first winding device winding up the first base film taken out from the water tank into a roll.

[11] The method according to [10] above, wherein the dipping means includes a first blade or a first wire brush capable of scraping off the first coating layer from the first base film in the water tank. The coating layer removal device described.

[12] The immersion means has a structure that causes the treated water to overflow from the upper part of the water tank and discharges the residue of the first coating layer that has fallen off from the first laminated film to the outside of the water tank. The coating layer removal device according to [10] or [11].

[13] The coating layer removal device according to any one of [10] to [12], wherein the stretching means includes a heating means for heating the first laminated film and the second film.

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.

FIG. 3 is a cross-sectional view of the first laminated film used in the removal method according to the first embodiment. FIG. 2 is a perspective view of a laminated film with ceramic green sheets. It is a sectional view of two laminated films after a contact process concerning a 1st embodiment. FIG. 2 is a cross-sectional view of two laminated films after a stretching process according to the first embodiment. It is a schematic diagram of the removal device concerning a 2nd embodiment. 7 is a schematic diagram of a third foreign matter removing means according to Modification 1. FIG. 7 is a schematic diagram of third and fourth scraping means according to Modification 2. FIG. FIG. 7 is a cross-sectional view of three laminated films after the second contact step according to Modification 3.

In this specification, ordinal expressions such as "first,""second," and "third" are for the purpose of distinguishing between structures and do not imply order.
In this specification, the expression without an ordinal number, for example, the expression "laminated film" is a general term for laminated films, and the expression without an ordinal number such as "first", "second", "third", etc. Used when giving explanations common to laminated films.
For example, when an explanation commonly applied to multiple structures is given with ordinal numbers, such as "first laminated film" and "second laminated film,""laminatedfilm" without ordinal numbers is given. By writing "film", "first laminated film" and "second laminated film" are collectively expressed.

[First embodiment]
[How to remove coating layer]
The coating layer removal method according to the present embodiment (hereinafter also referred to as the removal method according to the present embodiment) includes a method in which a first laminated film having a first base film and a first coating layer is wound. a step of preparing a first roll wound with a second film and a second roll wound with a second film (hereinafter also referred to as a preparation step); and a step of feeding out the first laminated film from the first roll. (hereinafter also referred to as a first feeding step), a step of feeding out the second film from the second roll (hereinafter also referred to as a second feeding step), and a step of feeding out the first laminated film from the second roll. A step of bringing the side surface of the first coating layer and one surface of the unrolled second film into contact with each other in a facing manner (hereinafter also referred to as a contact step); a step of stretching the first laminated film and the second film (hereinafter also referred to as a stretching step) while the first laminated film and the second film are in contact with each other; (hereinafter also referred to as a contact release step) and immersing the first laminated film from which contact has been released in treated water in a water tank, the first laminated film is removed from the first laminated film. and a first winding step of winding up the first base film from which the first coating layer has been removed into a roll.
The first coating layer includes a first intermediate layer and a first release agent layer, and in the first laminated film, the first intermediate layer is connected to the first base film and the first release agent layer. and the agent layer.

In this embodiment, the treated water is, for example, water for immersing the laminated film in the first removal step, and is water for penetrating the interface between the base film and the coating layer to reduce their mutual adhesion. used for The water used for the treated water is preferably ordinary water, ie, industrial water, and may be purified water or distilled water. Furthermore, the water may be water obtained by reusing wastewater used in various industrial productions, or may be water obtained by reusing wastewater after being used in the implementation of this embodiment. When wastewater is to be reused, wastewater may be recycled as appropriate.
From the viewpoint of improving work efficiency, the water used for the treated water may contain additives that add functionality, as appropriate, but it is preferable that they do not. Examples of additives include surfactants and water-soluble organic solvents. When the water used for the treated water contains an additive, the concentration of the active ingredient of the additive in the water is preferably 0.2% by mass or less, and preferably 0.1% by mass or less based on the total amount of water. More preferably, the water used for the treated water is not water to which additives have been intentionally added.
Further, the water used for the treated water is preferably not an alkaline aqueous solution prepared by intentionally adding a basic substance, and preferably not an acidic aqueous solution prepared by intentionally adding an acidic substance. The water used for treatment may contain basic substances and acidic substances as additives, as it is possible that wastewater can be easily recycled. In order to comply with uniform wastewater standards (other items), it is preferable that the pH of the treated water is 5.8 or more and 8.6 or less.
The temperature of the treated water is not particularly limited, and the temperature of the treated water may be room temperature. One embodiment of the treated water is hot water. When the treated water is used as hot water, the temperature of the hot water is, for example, preferably 40°C or higher, more preferably 60°C or higher. The temperature of the hot water is preferably less than 100°C, more preferably 98°C or less.

FIG. 1A is a cross-sectional view of the first laminated film 50 used in the removal method according to this embodiment.
The first laminated film 50 has a first base film 51 and a first coating layer 52. The first coating layer 52 includes a first intermediate layer 521 and a first release agent layer 522, and the first intermediate layer 521 is between the first base film 51 and the first release agent layer 522. It is located in
In FIG. 1A, a1 indicates the surface of the first intermediate layer 521 on the first base film side, and b1 indicates the surface of the first intermediate layer 521 on the first release agent layer side. d1 indicates the surface of the first release agent layer, and c1 indicates the surface of the first release agent layer 522 on the intermediate layer side.

In the first laminated film according to the present embodiment, it is preferable that the first base film and the first intermediate layer are in direct contact with each other. In the case of the first laminated film 50 shown in FIG. 1A, the first base film 51 and the first intermediate layer 521 are in direct contact, and the first intermediate layer 521 and the first release agent layer 522 are in direct contact with each other. are in direct contact.

The second film used in the removal method according to the present embodiment is not particularly limited as long as it has a base film.
The second film may be, for example, a film consisting only of a base film, a laminated film in which a coating layer is laminated on a base film, or a ceramic green sheet attached to the coating layer. A laminated film with a ceramic green sheet may be used (see FIG. 1B described later).

In the following description, the case where the second film is a second laminated film will be mainly described.

In the removal method according to the present embodiment, the coating layers of the first laminated film 50 and the second laminated film 50A are brought into contact with each other while facing each other (contact step), and in this state, the stretching step is performed.
FIG. 2A shows a cross-sectional view of the two laminated films after the contact step, and shows a structure in which the coating layers of the first laminated film 50 and the second laminated film 50A face each other and are in contact with each other. It is shown.
The structure shown in FIG. 2A may be referred to as a "laminated structure 600."
As shown in FIG. 2A, the second laminated film 50A includes a second base film 51A and a second coating layer 52A. The second coating layer 52A includes a second intermediate layer 521A and a second release agent layer 522A, and the second intermediate layer 521A is between the second base film 51A and the second release agent layer 522A. It is located in The second laminated film 50A may have the same configuration as the first laminated film 50, or may have a different configuration.
FIG. 2B shows a cross-sectional view of the two laminated films after the stretching process, and shows a state in which cracks 602 have occurred in the coating layer of the laminated structure 600. Specifically, cracks 602 occur in the first coating layer 520 (first intermediate layer 5210 and first release agent layer 5220) in the first laminated film 500 after the stretching process, and In the second laminated film 500A, cracks 602 have occurred in the second coating layer 520A (second intermediate layer 5210A and second release agent layer 5220A).
The structure shown in FIG. 2B may be referred to as a "stretched structure 600A."

The stretching process is, for example, a process of causing cracks in the coating layer by stretching the laminated structure 600 shown in FIG. 2A in the longitudinal direction (conveyance direction).
Creating cracks in the coating layer means that cracks occur in the thickness direction of the coating layer, and as shown in FIG. 2B, cracks that reach the interface with the base film are preferably generated. .
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.
Moreover, the coating layer may partially peel off from the surface of the base film due to the impact when cracks occur in the coating layer.
By creating cracks in the coating layer during the stretching process, it is possible to increase the infiltration area of the treated water into the coating layer when the laminated film is immersed in the treated water after the contact release process. As a result, the speed of separation (peeling) of the coating layer can be increased.
In addition, in the laminated film used in Patent Document 1, the laminated film is immersed in treated water without going through a stretching process, so compared to the removal method of this embodiment, the surface laminated part (water-soluble resin layer and It is thought that the speed of separation (peeling) of layers) is slowed down.

According to the removal method according to the present embodiment, since the stretching step is carried out with the coating layers of the two laminated films 50 and 50A facing each other and in contact with each other, the coating layer is removed from the surface of the base film during stretching. Even if it is peeled off, the fragments of the coating layer can remain inside the two base films 51, 51A. This allows the coating layer to be transported without scattering fragments of the coating layer.
In addition, when using a laminated film with a ceramic green sheet after it has been used in the production of a multilayer ceramic capacitor (MLCC) as a laminated film (see Figure 1B described later), half-cut portions (ceramic green sheet According to the removal method according to the present embodiment, the two laminated films 50, 50A are conveyed and stretched in contact with each other, where the laminated film is likely to be broken starting from the blade marks generated on the surface of the coating layer during punching. Therefore, the tension applied to the half-cut portion can be dispersed, and breakage of the laminated film during transportation and stretching can be suppressed.

In addition, according to the removal method according to the present embodiment, the laminated films 50 and 50A are paid out from two rolls in a roll-to-roll manner, and each step is performed continuously, so that the removal of the coating layer and the base film can be efficiently wound, the amount of base film recovered can be increased, and as a result, the recycling efficiency of the base film is improved.

In the laminated film according to this embodiment, the intermediate layer is preferably hydrophilic and water-insoluble.
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 will be explained using the first laminated film as an example. The same applies to the second laminated film.
In the laminated structure 600 before the stretching process, the first intermediate layer 521 of the first laminated film 50 is in close contact with the first base film 51 mainly due to hydrogen bonding and anchor effect (Fig. 1A).
In the stretching process, the laminated structure 600 shown in FIG. 2A is stretched, resulting in a plurality of cracks 602 in the coating layer disposed inside the structure (FIG. 2B). After the contact release step, the first laminated film 500 is immersed in treated water and transported. At that time, if the first intermediate layer is hydrophilic, the treated water will more easily infiltrate into the interface between the first base film 51 and the first intermediate layer 5210 through the cracks 602, The hydrogen bond and anchor effect between the intermediate layer 5210 and the first base film 51 are weakened. As a result, the first intermediate layer 5210 is more easily peeled off from the first base film 51 together with the first release agent layer 5220.

When the first intermediate layer is water-insoluble, the components of the first intermediate layer are prevented from eluting into the treated water. Therefore, since the first intermediate layer is water-insoluble, contamination of the treated water can be prevented and the treated water can be easily reused.

In this specification, whether the first intermediate layer is "hydrophilic" is determined if the contact angle of water on the surface of the first intermediate layer on the first base film side is 55 degrees or less. The first intermediate layer is determined to be hydrophilic. The same applies to the second intermediate layer.
In the case of the first laminated film 50 shown in FIG. 1A, if the contact angle of water on the surface of the first intermediate layer 521 on the first base film side (indicated by reference numeral a1 in FIG. 1A) is 55 degrees or less, The first intermediate layer 521 is hydrophilic.
Further, from the viewpoint of promoting the separability of the first base film, the contact angle is preferably 50 degrees or less, more preferably 45 degrees or less. The contact angle is calculated after the first base film is separated from the first laminated film, that is, after the first intermediate layer is brought into contact with water, the contact angle between the first intermediate layer and the first base film is determined. This is a value obtained by measuring the contact angle of water on the surface (separated surface) of the first intermediate layer that was in contact with the first base film after the interface was peeled off. Purified water is used as the water brought into contact with the intermediate layer when measuring the contact angle of water.

Specifically, the first intermediate layer is separated from the first base film and the contact angle of water on the surface of the first intermediate layer on the first 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 first intermediate layer on the first base film side.
Adhesive tape with a width of 50 mm (manufactured by Nitto Denko Corporation, product name "Polyester Adhesive Tape No. 31B") is pasted on the surface of the first release agent layer of the first laminated film, and then the size is reduced to 50 mm x 50 mm. Cut to prepare test pieces.
Next, a glass beaker with a capacity of 500 mL is filled with 300 mL of purified water at 90° C. as treated water, and the entire test piece is immersed in the purified water and left for 3 hours. After that, confirm that the test piece is separated into a laminate in which the first release agent layer and the first intermediate layer are integrally supported on the adhesive tape, and the first base film, The adhesive tape carrying the first release agent layer and the first intermediate layer is taken out of the purified water and dried at room temperature for 24 hours. Thereafter, the contact angle is measured on the surface of the first intermediate layer supported on the adhesive tape (the surface of the first intermediate layer that was in contact with the surface of the first 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 first intermediate layer is "water-insoluble" is determined by the amount of water on the surface of the first release agent layer (symbol d1 in FIG. 1A) measured using the following method. If the difference between the contact angle and the contact angle of water on the first base film side surface of the first intermediate layer (indicated by a1 in FIG. 1A) is 30 degrees or more, the first intermediate layer is non-contact. Judging to be water soluble. The same applies to the second intermediate layer. 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 first intermediate layer were eluted into water and the partially exposed first release agent layer was measured.
Further, the contact angle of water on the surface of the first 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 first 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 first release agent layer was measured according to JIS R3257:1999 by the sessile drop method using a contact angle meter (manufactured by Kyowa Interface Science Co., Ltd., product name "DM-701"). Ru. For droplets, use distilled water.

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

The removal method according to the present embodiment can be carried out using, for example, the coating layer removal apparatus according to the second embodiment (hereinafter also referred to as the removal apparatus 100 according to the second embodiment).
In the second embodiment, a case will be described in which the second film is the second laminated film 50A.

[Second embodiment]
[Coating layer removal device 100]
FIG. 3 is a schematic diagram of a removal device 100 according to the second embodiment.
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.

The removing device 100 according to the second embodiment removes the first laminated film from a first roll 1 around which a first laminated film 50 having a first base film 51 and a first coating layer 52 is wound. A first feeding device 10 that feeds out the film 50, and a second feeding device that feeds out the second laminated film 50A from the second roll 1A around which the second laminated film 50A (an example of the second film) is wound. 10A, a contact means 15 that brings the first coating layer 52 side surface of the unrolled first laminated film 50 and one side of the unrolled second laminated film 50A into contact with each other in a facing manner; A stretching means 20 for stretching the first laminated film 50 and the second laminated film 50A while the first laminated film 50 and the second laminated film 50A are in contact with each other; a contact release means 25 for releasing contact with the first laminated film 50A, an immersion means 30 including a water tank 32 for immersing the first laminated film 50 from which the contact has been released into the treated water HW; A first winding means 40 for winding up one base film 51 into a roll shape is provided.

The removal device 100 also includes a first foreign matter removing means 70 for removing foreign matter on the first base film 51 between the dipping means 30 and the first winding means 40; Between the winding means 40A, there is a second foreign matter removing means 70A for removing foreign matter on the second base film 51A, and a second foreign matter removing means for winding up the second base film 51A taken out from the water tank 32 into a roll. A winding means 40A is provided.

In the following description, the first feeding means 10, the first scraping means 80, the first winding means 40, and the first foreign matter removing means 70 are the second feeding means 10A, the second foreign matter removing means 70, respectively. Since they have the same configuration as the scraping means 80A, the second winding means 40A, and the second foreign matter removing means 70A and operate in the same manner, the first feeding means 10, the first scraping means 80, In the description of the first winding means 40 and the first foreign matter removing means 70, "first" can be read and used as "second", respectively.

<First feeding means 10, second feeding means 10A>
The first feeding means 10 includes a first roll 1 around which the first laminated film 50 is wound, a support member (not shown) that rotatably supports the first roll 1, and a drive roller (not shown). ). The configuration and operation of the second feeding means 10A are also similar.

<Contact means 15>
The contact means 15 makes the surface of the first coating layer 52 side of the unrolled first laminated film 50 and the surface of the second coating layer 52A side of the unrolled second laminated film 50A face each other. let them touch each other.
Examples of the contact means include known pressing means (for example, various rolls, etc.).
In the case of FIG. 3, the contact means 15 is a first nip roll NR1 and a first guide roll GR1 provided opposite to the first nip roll NR1.

<Stretching means 20>
The stretching means 20 includes a first stretching roll 21, a second stretching roll 22 provided downstream of the first stretching roll 21, and a periphery of the first stretching roll 21 and the second stretching roll 22. It includes a circumferential speed control means 23 for controlling the speed, and an upstream nip roll NR21 and a downstream nip roll NR22 provided opposite to the first stretching roll 21 and the second stretching roll 22, respectively.
Drive motors M1 and M2 are connected to the shaft portions of the first stretching roll 21 and the second stretching roll 22, respectively. The peripheral speed control means 23 controls the peripheral speeds of the first stretching roll 21 and the second stretching roll 22 by controlling these drive motors M1 and M2. The peripheral speed control means 23 is, for example, a computer.

It is preferable that the stretching means 20 includes a heating means for heating the first laminated film 50 and the second laminated film 50A. The heating means is not particularly limited, but examples include infrared heaters, halogen heaters, UV lamps, and hot air generators. The arrangement of the heating means is not particularly limited.
In the case of FIG. 3, a heating means 24 is provided in a region R2 between the first stretching roll 21 and the second stretching roll 22. The heating means 24 may be provided in a region R1 between the first nip roll NR1 or the first guide roll GR1 and the upstream nip roll NR21.

<Contact release means 25>
The contact release means 25 is a means for releasing the contact between the first multilayer film 500 and the second multilayer film 500A after stretching.
Examples of the contact release means 25 include a member that guides the first laminated film 500 and the second laminated film 500A to different paths.
In the case of FIG. 3, the contact release means 25 is a plurality of guide rolls GR31 for guiding the first laminated film 500 and a plurality of guide rolls GR32 for guiding the second laminated film 500A in the water tank 32.

<Immersion means 30>
The immersion means 30 includes a water tank 32 for immersing the first laminate film 500 and the second laminate film 500A, which are no longer in contact with each other, in the treated 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 for storing treated water HW, a heating means 95 for adjusting the treated water HW to a predetermined temperature, and a first coating layer 520 for scraping the first coating layer 520 from the first base film 51. and means 80 for dropping.
The immersion means 30 also causes the treated water HW to overflow from the upper part of the water tank 32 and discharges the dregs of the coating layers 520 and 520A that have fallen off from the first laminated film 500 and the second laminated film 500A to the outside of the water tank 32. (hereinafter also referred to as a discharge structure).

The number of guide rolls GR31 and GR32 arranged in the water tank 32 is appropriately determined according to the size of the water tank. The number of guide rolls GR31 and GR32 is usually two or more each.
The heating means 95 may be provided outside the water tank 32, or may be provided inside the water tank 32 as shown in FIG. A known heater can be used as the heating means.

The dipping means 30 preferably includes a first scraping means 80 for scraping off the first coating layer 520 from the first base film 51 in the water tank 32 .
The immersion means 30 preferably includes a second scraping means 80A (in the case of FIG. 3, a second blade 81A) that scrapes off the second coating layer 520A from the second base film 51A in the water tank 32. .
In the case of FIG. 3, the first scraping means 80 is a first blade 81. The first blade 81 is provided so as to come into contact with the surface on the first coating layer 520 side.
The arrangement position of the first blade 81 is not particularly limited. The first blade 81 may be provided on the upstream side or near the center of the transport path within the water tank 32, but is preferably provided on the downstream side of the transport path within the water tank 32 as shown in FIG. By providing the first blade 81 on the downstream side of the conveyance path, the first coating layer can be scraped off after the treated water HW has been sufficiently immersed, and the scraped first coating layer can also be scraped off. Reduces the number of surfaces on which debris is likely to adhere.
Two or more first blades 81 may be provided. The material of the first blade 81 is not particularly limited.
The structure and operation of the second scraping means 80A are also similar. The first scraping means 80 and the second scraping means 80A may be the same or different.

The discharge structure includes a coating separation tank 90 provided adjacent to the water tank 32, a filter 92 for filtering the dregs of the coating layers 520 and 520A, and treated water HW discharged from the drain port 93A of the coating separation tank 90, which circulates. and a circulation pump P that circulates the treated water HW.
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.

The dipping means 30 is used to guide the dregs of the coating layers 520, 520A that have fallen off from the first base film 51 and the second base film 51A and are released into the treated water HW to a predetermined position in the water tank 32. It is preferable to include water flow guiding means.
The predetermined position is a position where the residue of the coating layers 520, 520A 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.
When the water surface is viewed from the top surface of the water tank 32 (when viewed from the Z-axis direction), the water flow guiding means directs the coating layer to an area (for example, the upper end of the water tank 32) where the plurality of guide rolls GR31 and GR32 are not arranged. It is preferable to induce dregs.
By providing the dipping means 30 with a water flow guiding means, the residue of the coating layers 520, 520A can be efficiently collected.

<First foreign matter removing means 70, second foreign matter removing means 70A>
The first foreign matter removing means 70 is provided between the dipping means 30 and the first winding means 40 and is a means for removing foreign matter on the first base film 51 taken out from the water tank 32.
The foreign matter is, for example, the first coating layer 520 remaining on the first base film 51 and water droplets attached on the first base film 51.
The first foreign matter removing means 70 is not particularly limited, and examples thereof include an air knife, a dryer, a high-pressure water nozzle, and the like. The first foreign matter removing means 70 may be disposed at least on the side of the first base film 51 on which the first coating layer 520 was provided.
When the foreign matter removing means is a dryer, hot air is blown onto the first base film 51.

In the case of FIG. 3, the foreign matter removing means 70 includes an air knife 71 and a high-pressure water nozzle 72. The air knives 71 are provided facing each other with the first base film 51 interposed therebetween. Similarly, the high-pressure water nozzles 72 are provided facing each other with the first base film 51 interposed therebetween.
The air knife 71 blows air onto both sides of the first base film 51 taken out from the water tank 32, thereby removing the first coating layer 520 remaining on the first base film 51 and the first base film. Remove water droplets adhering to 51.
The high-pressure water nozzle 72 injects high-pressure water onto both sides of the first base film 51 taken out from the water tank 32 to remove the first coating layer 520 remaining on the first base film 51.
The configuration and operation of the second foreign matter removing means 70A are also similar. The first foreign matter removing means 70 and the second foreign matter removing means 70A may be the same or different.

<First winding means 40, second winding means 40A>
The first winding means 40 includes a first winding roll 4 for winding up the first base film 51 taken out from the water tank 32 into a roll shape, and a first winding roll 4 rotatably. It includes a supporting member (not shown) and a driving roller (not shown).
The configuration and operation of the second winding means 40A are also similar.

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

In the following description, the first feeding step, the first removing step, the first foreign matter removing step, and the first winding step are respectively replaced by the second feeding step, the second removing step, and the second winding step. Since it has the same configuration as the foreign matter removal process and the second winding process and operates in the same way, the first feeding process, the first removal process, the first foreign body removal process, and the first winding process "First" in the parts explaining the process can be read and used as "second" respectively.

<Preparation process>
In the preparation step, the first roll 1 on which the first laminated film 50 having the first base film 51 and the first coating layer 52 is wound, the second base film 51A and the second This is a step of preparing a second roll 1A around which a second laminated film 50A having a coating layer 52A is wound.
In the preparation process, for example, the combination of the first roll 1 and the second roll 1A with the same width and length is selected, and the ease with which the coating layers 52, 52A break in the stretching process (coating It is preferable to select a combination of the first roll 1 and the second roll 1A that have the same susceptibility to cracks 602 in the layers 52 and 52A.
From the viewpoint of making the coating layers 52, 52A even in ruptureability, the first coating layer 52 and the second coating layer 52A are preferably made of the same material or similar materials.

The first laminated film 50 is a laminated film with a ceramic green sheet, and it is preferable that the ceramic green sheet is attached to the side of the first coating layer 52 opposite to the first base film 51. The same applies when the second laminate film 50A is a laminate film with ceramic green sheets.
FIG. 1B is a perspective view of a laminated film 50G when the first laminated film 50 is a laminated film 50G with ceramic green sheets.
FIG. 1B shows a state in which a ceramic green sheet-attached laminated film 50G is unwound from a roll 1G.
Ceramic green sheet residue 920 is attached to the surface of first coating layer 52 . After the ceramic green sheet is peeled off, a recess 910 is formed, and the first coating layer 52 is exposed from the recess 910.

<First feeding process, second feeding process>
The first unwinding step is a step of unwinding the first laminated film 50 from the first roll 1. The structure and operation of the second feeding step are also similar.

<Contact process>
The contacting step is a step of bringing the surface of the first unrolled laminated film on the first coating layer side and the surface of the unrolled second laminated film on the second coating layer side to face each other and come into contact with each other. It is.
In the case of FIG. 3, the first laminated film 50 fed out from the first roll 1 and the second laminated film 50A fed out from the second roll 1A are connected to the first nip roll NR1 and the first guide. When passing between the roll GR1, a structure (laminated structure 600) is formed in which the coating layers of the two laminated films 50 and 50A face each other and are in contact with each other.

<Stretching process>
The stretching process is a process of stretching the first laminated film and the second laminated film while the first laminated film and the second laminated film are in contact with each other.
In the case of FIG. 3, the laminated structure 600 after the contact step is wound around the upstream nip roll NR21 and the first stretching roll 21 in order and conveyed, and is conveyed between the first stretching roll 21 and the second stretching roll 22. (stretching process). This stretching process causes cracks 602 in the coating layer of the laminated structure 600, resulting in a stretched structure 600A (FIG. 2B).
As a method for stretching the laminated structure 600 after the contact step, for example, the circumferential speed of the second stretching roll 22 provided on the downstream side of the conveyance path is set to the same value as that of the first stretching roll 22 provided on the upstream side of the conveyance path. A method of controlling the circumferential speed of the roll 21 to be faster than the circumferential speed of the roll 21, and providing one or more other stretching rolls between the first stretching roll 21 and the second stretching roll 22, so that the laminated structure 600 is Examples include a method of conveying the material while winding it around the stretching roll 21, another stretching roll, and the second stretching roll 22.

The stretching process is preferably performed while heating the laminated structure 600 (first laminated film 50 and second laminated film 50A) after the contacting process. As a result, cracks are more likely to occur in the coating layer than when the stretching process is performed at room temperature. In the case of FIG. 3, the laminated structure 600 is heated using the heating means 24.
The heating in the stretching process is more effective when at least one of the first laminate film 50 and the second laminate film 50A is a laminate film with a ceramic green sheet.
As described above, the laminated film with ceramic green sheets is likely to break during transportation, starting from the half-cut portion created after punching out the ceramic green sheet.
On the other hand, in the stretching process of this embodiment, a structure (laminated structure 600) is formed in which two laminated films 50 and 50A are brought into contact with each other, and this laminated structure 600 is stretched while being heated. , it is possible to suppress breakage of the laminated film with ceramic green sheets during stretching. As a result, even when a laminated film with ceramic green sheets is used as the laminated film, removal of the coating layer and winding of the base film can be completed without problems in a roll-to-roll manner.

In the stretching process, the heating temperature and heating time when heating the laminated structure 600 are determined by the materials of the base film and the coating layer (intermediate layer and release agent layer).
Note that after the contacting step and before the stretching step, there may be a further step of heating the laminated structure 600. By heating the laminated structure 600 before performing the stretching process, cracks are likely to occur in the coating layer arranged inside the laminated structure 600.

It is preferable to heat the laminated structure 600 at a temperature equal to or higher than the glass transition temperature _Tg of the base film for the following reason.
The glass transition temperature Tg ₁ of the base film and the glass transition temperature Tg ₂ of the coating layer are determined in accordance with the method specified in JIS K7121 (2012) and measured using a differential scanning calorimeter (DSC). do. The temperature during stretching is preferably set to a glass transition temperature Tg _{of 1} or more of the base film, in order to make it easier to stretch the base film without breaking it, while also making it easier to break the coating layer. More preferably, the transition temperature Tg is ₁ or more and the glass transition temperature Tg of the coating layer is ₂ or less.

<Contact release process>
The contact release process is a process of releasing contact between the first laminated film 50 and the second laminated film 50A.
In the case of FIG. 3, the stretched structure 600A is immersed in the treated water HW and transported via the second guide roll GR2 and the third guide roll GR3. In the treated water HW, the first laminated film 500 is wound around a plurality of guide rolls GR31, and the second laminated film 500A is wound around a plurality of guide rolls GR32, and guided to different paths from each other. . Thereby, the contact between the first laminated film 500 and the second laminated film 500A is released.

<First removal step, second removal step>
The first removal step is a step of removing the first coating layer 520 from the first laminated film 500 by immersing the first laminated film 500 from which contact has been released into treated water HW in a water tank. .
In the first removal step, the first coating is removed from the first base film 51 while the first laminated film 500 is being conveyed while being wound around a plurality of guide rolls GR31 provided in the treated water HW. Layer 520 falls off and is released into the treated water HW.
The first removal step may be a step of immersing the first laminated film 500 from which contact has been released in the treated water HW, and then scraping off the first coating layer 520 from the first base film 51. preferable. In the case of FIG. 3, the first removal step is a step of scraping off the first coating layer 520 from the first base film 51 using a blade 81 (an example of the first scraping means 80). This makes it more difficult for the first coating layer 520 to remain on the first base film 51.
The structure and operation of the second removal step are also similar.
The treated water HW used in the contact release step, the first removal step, and the second removal step can be the treated water described in the first embodiment. When the treated water HW is used as hot water, the temperature of the hot water 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. The temperature of the treated water HW may be room temperature.

The removal method according to the first embodiment is a step (coating It is preferable to further include a layer discharge step).
Methods for overflowing the treated water HW include, for example, a method of injecting the treated water HW into the water tank from an overflow injection pipe, a method of circulating the treated water HW discharged from the water tank, and supplying the treated water HW to the water tank again. and a method of using these methods in combination.
In the case of FIG. 3, the residue of the coating layers 520, 520A that has fallen off from the two laminated films 500, 500A overflows from the water tank 32 together with the treated 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 layers 520, 520A is filtered by a filter 92. The treated water HW 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.

The removal method according to the first embodiment includes the coating layer discharge step, so that the treated water HW used in the first removal step and the second removal step 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 the treated water HW, so that contamination of the treated water HW can also be prevented.

<First foreign matter removal process, second foreign matter removal process>
The removal method according to the first embodiment is performed after the first base film from which the first coating layer has been removed is taken out from the treated water HW and before the step of winding the first base film into a roll. The method further includes a first foreign matter removal step of removing foreign matter on the first base film.
In the case of FIG. 3, the first foreign matter removal step is to apply a high pressure water stream from a high pressure water nozzle 72 (an example of the first foreign matter removing means 70) to both sides of the first base film 51 taken out from the treated water HW. This is a step of removing foreign matter on the first base film 51 by spraying and then blowing air from an outlet (not shown) of an air knife 71 (an example of the first foreign matter removing means 70). By performing the first foreign matter removal step, the first coating layer remaining on the first base film 51 and water droplets attached on the first base film 51 are removed.
The structure and operation of the second foreign matter removal step are also similar.

<First winding process, second winding process>
The first winding step is a step of winding up the first base film 51 from which the first coating layer 520 has been removed into a roll shape.
In the case of FIG. 3, the first base film 51 from which foreign matter has been removed by the high-pressure water nozzle 72 and the air knife 71 passes through the guide roll GR5 and is then wound up into a roll by the first winding roll 4. The structure and operation of the second winding step are also similar.

[Modified example of embodiment]
[Modification 1]
In the removal device 100 according to the second embodiment, at least one of the first foreign matter removing means 70 in the region R4 and the second foreign matter removing means 70A in the region R5 is replaced with the third foreign matter removing means shown in FIG. 4A. It may be changed to 70B.
In the following, a case will be described in which the first foreign matter removing means 70 is changed to the third foreign matter removing means 70B shown in FIG. 4A.
The third 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.
The materials of the water absorption rolls 73a, 73b and the metal rolls 74a, 74b are not particularly limited.
First, the first coating layer remaining on the first base film 51 is removed by jetting a high-pressure water stream from the high-pressure water nozzle 72, and then the water droplets attached on the first base film 51 absorb water. Water is absorbed by the 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. The water pushed out from the water absorption rolls 73a and 73b drips into the water tank 32.

[Modification 2]
In the removal device 100 according to the second embodiment, the first scraping means 80 in the region R3 may be changed to the third scraping means 80B shown in FIG. 4B, or the second scraping means 80 in the region R3 The scraping means 80A may be changed to a fourth scraping means 80C shown in FIG. 4B.
Below, a case where the first scraping means 80 is changed to a third scraping means 80B shown in FIG. 4B will be described.
The third scraping means 80B is the first wire brush 82. The first wire brush 82 is provided facing the guide roll GR4, and is provided so as to come into contact with the surface of the first laminated film 500 on the first coating layer 520 side.
The third scraping means 80B may include two or more first wire brushes 82.

[Modification 3]
The removal method according to the first embodiment can also be carried out using one or more third laminated films having a third base film and a third coating layer.
In the case of this aspect, the removal method according to the first embodiment includes a step of further feeding out one or more third laminated films having a third base film and a third coating layer (hereinafter referred to as a third feeding step). one or more third laminated films, the first laminated film, and the second film so that the surface of the third coating layer of the third laminated film is not located on the outside. (hereinafter also referred to as a second contact step) in which the first laminated film, the second film, and one or more third laminated films are in contact with each other. A step of stretching the laminated film, the second film, and one or more third laminated films (hereinafter also referred to as a second stretching step), and after stretching, the first laminated film and the second film, A step of releasing the contact with the one or more third laminated films (hereinafter also referred to as a second contact removing step), and removing the one or more third laminated films from which the contact has been released into the treated water in the aquarium. a third removing step of removing the third coating layer from the third laminated film by immersing it in water; and a third removing step of winding the third base film from which the third coating layer has been removed into a roll. 3 winding steps.

The first feeding process, contact process, stretching process, contact release process, first removal process, and first winding process described in the first embodiment are the third feeding process according to Modification 3, respectively. , the second contact step, the second stretching step, the second contact release step, the third removal step, and the third winding step, and operate in the same manner. In the portions describing the feeding process, the first removing process, and the first winding process, "first" can be read and used as "second", respectively. Regarding the parts explaining the contact process, the stretching process, and the contact release process, each process can be read and referred to as the second contact process, the second stretching process, and the second contact release process, respectively.

FIG. 5 shows a cross-sectional view of the three laminated films after the second contact step, and the surfaces of all the coating layers 52, 52A, 52B of the three laminated films 50, 50A, 50B are on the outside. The state in which three laminated films 50, 50A, and 50B are stacked and in contact with each other is shown so that the coating layers 52, 52A, and 52B are not disposed on the inside (that is, the surfaces of the coating layers 52, 52A, and 52B are disposed on the inside).
The structure shown in FIG. 5 may be referred to as a "laminated structure 600B."
The third laminated film 50B includes a third base film 51B and a third coating layer 52B. The third coating layer 52B includes a third intermediate layer 521B and a third release agent layer 522B, and the third intermediate layer 521B is between the third base film 51B and the third release agent layer 522B. It is located in The third laminated film 50B, the first laminated film 50, and the second laminated film 50A may have the same configuration or different configurations.

Below, the case where the removal method of 1st Embodiment is implemented using three laminated films 50, 50A, and 50B as a laminated film is demonstrated. Points different from the first embodiment will be explained.
In the second stretching process according to Modification Example 3, the laminated structure 600B (FIG. 5) obtained in the second contact process is stretched in the longitudinal direction (conveyance direction), so that the laminated structure 600B is placed inside the laminated structure 600B. Cracks are generated in the three coating layers 52, 52A, and 52B.
According to the removal method according to Modification 3, the second stretching step is carried out in a state where the surfaces of all the coating layers 52, 52A, 52B of the three laminated films 50, 50A, 50B are not arranged on the outside. Therefore, even if the coating layer is peeled off from the surface of the base film during stretching, fragments of the coating layer can be retained inside the laminated structure 600B. This allows the coating layer to be transported without scattering fragments of the coating layer.

The second contact release step is a step in which the stretched first laminated film, second laminated film, and third laminated film are released from contact with each other.
The first laminated film, the second laminated film, and the third laminated film are released from contact by, for example, being wound around guide rolls that are guided along different routes.
After that, for the third laminated film, the third coating layer is removed from the third laminated film (the third coating layer is 3), the third base film is wound up into a roll (third winding step).

The present invention is not limited to the above embodiments. 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 above embodiment will be explained.

[Laminated film]
The laminated film used in the above-described embodiments has 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. In this specification, the term "main component" or "main component" means that the proportion of the material in the entire mass is 50% by mass or more.
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, rigidity, etc., 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. The components become segregated near the outer surface of the release agent layer, and are 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 thermosetting 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 polyorganic resin that imparts releasability to the release agent layer. Compositions containing siloxanes may be mentioned. 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 to protect the surfaces of other functional sheets and various parts used for specific purposes during manufacture, transportation, storage, etc. 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... First roll, 4... First winding roll, 10... First feeding means, 15... Contact means, 20... Stretching means, 21... First stretching roll, 22... Second stretching roll, 23... Peripheral speed control means, 24, 95... Heating means, 25... Contact release means, 30... Immersion means, 32... Water tank, 40... First winding means, 50,500... First laminated film, 51... 1st base film, 52, 520... 1st coating layer, 70... 1st foreign matter removing means, 71... air knife, 72... high pressure water jet nozzle, 80... 1st scraping means, 81... 1st blade, 82...first wire brush, 90...coating separation tank, 92...filter, 93...circulation path, 100...removal device, 521,5210...first intermediate layer, 522,5220...first stripping agent Layer, 600, 600B...Laminated structure, 600A...Stretched structure, 602...Crack.

Claims (13)

1. A step of preparing a first roll around which a first laminated film having a first base film and a first coating layer is wound, and a second roll around which a second film is wound. and,
   Paying out the first laminated film from the first roll;
   Paying out the second film from the second roll;
   A step of bringing the first coating layer side surface of the unrolled first laminated film and one side of the unrolled second film to face each other and come into contact with each other;
   stretching the first laminated film and the second film while the first laminated film and the second film are in contact with each other;
   a step of releasing contact between the first laminated film and the second film;
   a first removing step of removing the first coating layer from the first laminated film by immersing the first laminated film from which contact has been released in treated water in a water tank;
   a first winding step of winding the first base film from which the first coating layer has been removed into a roll;
   The first coating layer includes a first intermediate layer and a first release agent layer,
   In the first laminated film, the first intermediate layer is disposed between the first base film and the first release agent layer.
   How to remove coating layer.
2. The first removal step is a step of immersing the first laminated film from which contact has been released in the treated water, and then scraping off the first coating layer from the first base film.
   The method for removing a coating layer according to claim 1.
3. The method further comprises a step of causing the treated water to overflow from the upper part of the water tank and discharging the residue of the first coating layer that has fallen off from the first laminated film to the outside of the water tank.
   The method for removing a coating layer according to claim 1.
4. After the first base film from which the first coating layer has been removed is removed from the treated water and before the first winding step, foreign matter on the first base film is removed. further comprising a first foreign matter removal step;
   The method for removing a coating layer according to claim 1.
5. The stretching step is performed while heating the first laminated film and the second film.
   The method for removing a coating layer according to claim 1.
6. The second film is a second laminated film,
   The second laminated film has a second base film and a second coating layer,
   The second coating layer includes a second intermediate layer and a second release agent layer,
   In the second laminated film, the second intermediate layer is disposed between the second base film and the second release agent layer,
   The contacting step is a step of bringing a surface of the first laminate film on the first coating layer side and a surface of the second laminate film on the second coating layer side to face each other and bring them into contact. and
   After the step of releasing the contact,
   a second removal step of removing the second coating layer from the second laminated film by immersing the second laminated film from which contact has been released in treated water in the water tank;
   further comprising a second winding step of winding the second base film from which the second coating layer has been removed into a roll;
   The method for removing a coating layer according to claim 1.
7. Further unrolling one or more third laminated films having a third base film and a third coating layer;
   One or more of the third laminate film, the first laminate film, and the second film are arranged so that the surface of the third coating layer of the third laminate film is not placed on the outside. A step of repeatedly contacting the
   With the first laminated film, the second film, and one or more of the third laminated films in contact with each other, the first laminated film, the second film, and one or more of the third laminated films are in contact with each other. Stretching the third laminated film;
   a step of releasing contact between the first laminated film, the second film, and one or more of the third laminated films after stretching;
   a third removing step of removing the third coating layer from the third laminated film by immersing one or more of the third laminated films from which contact has been released in treated water in the water tank; ,
   The method for removing a coating layer according to claim 1, further comprising a third winding step of winding up the third base film from which the third coating layer has been removed into a roll.
8. the first intermediate layer is hydrophilic and water-insoluble;
   The method for removing a coating layer according to claim 1.
9. The first laminated film is a laminated film with ceramic green sheets,
   A ceramic green sheet is attached to a side of the first coating layer opposite to the first base film.
   The method for removing a coating layer according to claim 1.
10. a first feeding means that feeds out the first laminated film from a first roll around which a first laminated film having a first base film and a first coating layer is wound;
    a second feeding device that feeds out the second film from a second roll around which the second film is wound;
    a contact means for bringing a surface of the first coating layer side of the unrolled first laminated film and one surface of the unrolled second film into contact with each other in a facing manner;
    Stretching means for stretching the first laminate film and the second film while the first laminate film and the second film are in contact with each other;
    contact release means for releasing contact between the first laminated film and the second film;
    immersion means comprising a water tank for immersing the first laminated film out of contact in treated water;
    a first winding means for winding the first base film taken out from the water tank into a roll;
    Coating layer removal equipment.
11. The dipping means includes a first blade or a first wire brush that can scrape off the first coating layer from the first base film in the water tank.
    The coating layer removal device according to claim 10.
12. The immersion means has a structure that causes the treated water to overflow from the upper part of the water tank and discharges the residue of the first coating layer that has fallen off from the first laminated film to the outside of the water tank.
    The coating layer removal device according to claim 10.
13. The stretching means includes a heating means for heating the first laminated film and the second film.
    The coating layer removal device according to claim 10.
    

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