JP2023148861A - Coating layer removal method and coating layer removal device - Google Patents

Abstract

To provide a coating layer removal method that can easily remove a coating layer from a laminated film transported in a roll-to-roll manner, the laminated film having a base material film and the coating layer.SOLUTION: A coating layer removal method has: a process of preparing a roll 1 on which a laminated film 50 having a base material film and a coating layer is wound; a process of delivering the laminated film 50 from the roll 1; a process of drawing the delivered laminated film 50; a process of removing the coating layer from the drawn laminated film 50A; and a process of winding into a roll the base material film 51 from which the coating layer is removed.SELECTED DRAWING: Figure 3

Description

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 discloses that a plastic component with a coating film formed on the surface of the plastic component is exposed to a high temperature atmosphere of 400° C. or more and 1000° C. or less to embrittle the coating film and remove it. A method for treating a coated plastic part is disclosed.

JP2012-167213A

However, the treatment method described in Patent Document 1 directly exposes plastic parts of various sizes to a high-temperature atmosphere to embrittle the paint film on the surface. It may not be possible to remove it.

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.

According to one aspect of the present invention, the steps include: preparing a roll around which a laminated film having a base film and a coating layer is wound; a step of unwinding the laminated film from the roll; and a step of unwinding the laminated film from the roll. Removal of the coating layer, comprising the steps of stretching the film, removing the coating layer from the stretched laminated film, and winding up the base film from which the coating layer has been removed into a roll. A method is provided.

In the method for removing a coating layer according to one aspect of the present invention, the step of removing the coating layer is preferably a step of transferring the coating layer from the base film to an adhesive roll.

In the method for removing a coating layer according to one aspect of the present invention, the step of removing the coating layer is preferably a step of scraping off the coating layer from the base film using a blade or a wire brush.

In the method for removing a coating layer according to one aspect of the present invention, the step of removing the coating layer is preferably a step of scraping off the coating layer from the base film with a blasting material.

In the method for removing a coating layer according to one aspect of the present invention, the step of stretching the laminated film is preferably performed while heating the laminated film.

In the method for removing a coating layer according to one aspect of the present invention, after the step of stretching the laminated film and before the step of removing the coating layer, the coating layer of the stretched laminated film is heated. It is preferable to include a step of spraying water vapor.

In the method for removing a coating layer according to one aspect of the present invention, the laminated film is preferably used for manufacturing a ceramic green sheet and is a laminated film after the ceramic green sheet has been peeled off.

According to one aspect of the present invention, there is provided a coating layer removal device for removing a 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;
removing means for removing the coating layer from the stretched laminated film;
a winding means for winding the base film into a roll;
A coating layer removal device is provided.

In the coating layer removing device according to one aspect of the present invention, it is preferable that the removing means includes an adhesive roll and is a means for transferring the coating layer from the base film to the adhesive roll.

In the coating layer removing device according to one aspect of the present invention, it is preferable that the removing means includes a blade or a wire brush and is a means for scraping off the coating layer from the base film.

In the coating layer removing device according to one aspect of the present invention, it is preferable that the removing means includes a blasting device and scrapes the coating layer from the base film with a blasting material.

The coating layer removal apparatus according to one aspect of the present invention preferably further includes a steam spraying means, and the steam spraying means is preferably a means for spraying superheated steam toward the coating layer of the stretched laminated film. .

In the coating layer removal apparatus according to one aspect of the present invention, the stretching means preferably includes a heating means for heating the laminated film.

In the coating layer removal device according to one aspect of the present invention, the laminated film is preferably used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled from the laminated 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.

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. 1A is stretched|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 showing an example of a coating layer removal device concerning a 3rd embodiment. It is a schematic diagram showing an example of a coating layer removal device concerning a 4th embodiment. It is a schematic diagram showing an example of a coating layer removal device concerning a 5th embodiment. It is a schematic diagram showing an example of a coating layer removal device concerning a 6th 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-out laminated film (hereinafter also referred to as a stretching step), and a step of removing the coating layer from the stretched laminated film (hereinafter also referred to as a stretching step). , also referred to as a removing step), and a step of winding up the base film from which the coating layer has been removed into a roll shape (hereinafter also referred to as a winding step).

FIG. 1A 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 first embodiment.
Laminated film 50 has a base film 51 and a coating layer 52. In the laminated film 50, the base film 51 and the coating layer 52 are in direct contact.
FIG. 1B shows an example of a cross-sectional view of the laminated film 50A when the laminated film 50 shown in FIG. 1A is stretched in the longitudinal direction (conveyance direction) by the stretching process.
FIG. 1B shows a state in which a plurality of cracks 522 have occurred in the coating layer 52A of the stretched laminated film 50A.

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. 1B). 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. By stretching, it is preferable that the coating layer on the base film becomes a small piece surrounded by cracks. FIG. 2 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. 2, 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 in the vicinity of the crack, trapping air. If such peeling occurs, the coating layer can be removed more reliably in the next step, which is preferable.
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.

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 sixth 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 FIGS. 3 to 7 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. shall be.

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 feeding means 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 coating layer (coating layer 52A after stretching) is removed from the stretched laminated film 50A. and a winding means 40 that winds up the base film 51 into a roll.
In the second embodiment, a case will be described in which the removing means 30 includes an adhesive roll 5.

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.
The respective shaft portions of the first stretching roll 3A and the second stretching roll 3B are connected to drive motors M1 and M2. 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, heating means 80 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.

<Removal means 30>
The removal means 30 is equipped with an adhesive roll 5 and is a means for transferring the coating layer (coating layer 52A after stretching) from the base film 51 to the adhesive roll 5.
The adhesive roll 5 is, for example, a roll around which an adhesive sheet 60 having a base sheet and an adhesive layer is wound. The base sheet is not particularly limited, and examples include paper and resin sheets. The adhesive layer is not particularly limited, and any known adhesive layer can be used.
The removing means 30 includes an adhesive roll 5, an adhesive paper winding roll 6, and a guide roll 7 provided opposite to the adhesive roll 5.
In the case of FIG. 3, the coating layer (coating layer 52A after stretching) is transferred to the adhesive layer of the adhesive sheet 60. The adhesive paper winding roll 6 winds up the adhesive sheet to which the coating layer 52A has been transferred (hereinafter also referred to as the adhesive sheet with coating layer 61).

<Winding means 40>
The winding means 40 includes a winding roll 4 for winding up the base film 51 into a roll, a support member (not shown) that rotatably supports the winding roll 4, and a drive roller (not shown). We are prepared.

When using the coating layer removal apparatus 100 according to the second embodiment, 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, in FIG. 1A. In the laminated film 50 fed out from the roll 1, in the region R1 of FIG. 3, a base film 51 and a coating layer 52 are 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, in FIG. 1B. Moreover, the state of the laminated film 50A after stretching in region R2 viewed from the Z axis is shown in FIG. 2, for example.
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 peripheral speed of the second stretching roll 3B provided on the downstream side of the transport path is made faster than the peripheral speed of the first stretching roll 3A provided on the upstream side of the transport 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 80 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, 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 the coating layer 52.

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 reason.
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 process is a process of removing the coating layer (coating layer 52A after stretching) from the stretched laminated film 50A.
In the case of FIG. 3, the removal process is a process of transferring the stretched coating layer 52A from the base film 51 to the adhesive roll 5.
The laminated film 50A stretched in the stretching step is conveyed toward the adhesive roll 5 after passing through the second stretching roll 3B and the second nip roll 2B while being curved in a substantially S-shape. When the stretched laminated film 50A passes between the adhesive roll 5 and the guide roll 7, the coating layer 52A is transferred from the base film 51 to the adhesive layer of the adhesive sheet 60. The adhesive sheet to which the coating layer 52A has been transferred (adhesive sheet with coating layer 61) is wound up by an adhesive paper winding roll 6.

<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 is wound into a roll by the take-up roll 4.

[Third embodiment]
[Coating layer removal device 100A]
A coating layer removal apparatus 100A according to a third embodiment will be described.
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 coating layer removal apparatus 100A according to the third embodiment. A removal apparatus 100A shown in FIG. 4 is the same as the second embodiment except that the removal means is different from the removal apparatus 100 described in the second embodiment.

<Removal means 30A>
The removing means 30A includes a blade 5A and is a means for scraping off the stretched coating layer 52A from the base film 51.
The blade 5A is provided at any position downstream of the laminated film 50A stretched in the stretching process.
In the case of FIG. 4, the blade 5A is provided so as to come into contact with the laminated film (the stretched laminated film 50A) on the downstream side of the guide roll 7. The removing means 30A includes a blade 5A that scrapes off the stretched coating layer 52A, and a tray 63 that collects the scraped coating layer 52A.
The material of the blade 5A is not particularly limited.

When using the coating layer removal apparatus 100A according to the third embodiment, the coating layer removal method according to the first embodiment is performed, for example, through the following steps.
In the following, points different from the second embodiment will be mainly explained.

<Removal process>
The removal process is a process of scraping off the stretched coating layer 52A from the base film 51 using the blade 5A.
The coating layer scraped off by the blade 5A (coating layer 52A after stretching) is collected in the tray 63.

[Fourth embodiment]
[Coating layer removal device 100B]
A coating layer removal device 100B according to the fourth embodiment will be described.
In the fourth embodiment, the explanation will focus on the differences from the second 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 coating layer removal apparatus 100B according to the fourth embodiment. A removal apparatus 100B shown in FIG. 5 is the same as the second embodiment except that the removal means is different from the removal apparatus 100 described in the second embodiment.

<Removal means 30B>
The removing means 30B includes a wire brush 5B and is a means for scraping off the stretched coating layer 52A from the base film 51.
The wire brush 5B is rotatably provided at any position downstream of the stretched laminated film 50A.
In the case of FIG. 5, the wire brush 5B is provided facing the guide roll 7. The removing means 30B includes a wire brush 5B that scrapes off the stretched coating layer 52A, and a tray 63 that collects the scraped coating layer 52A.
The material of the wire brush 5B is not particularly limited.
As shown in FIG. 5, the coating layer 52A can be efficiently recovered by arranging the wire brush 5B and the guide roll 7 to face each other in the horizontal direction and scraping the coating layer 52A downward.

When using the coating layer removal device 100B according to the fourth embodiment, the coating layer removal method according to the first embodiment is performed, for example, through the following steps.
In the following, points different from the second embodiment will be mainly explained.

<Removal process>
The removal process is a process of scraping off the stretched coating layer 52A from the base film 51 using the wire brush 5B.
When the stretched laminated film 50A passes between the wire brush 5B and the guide roll 7, the coating layer (stretched coating layer 52A) is scraped off from the base film 51 by the rotation of the wire brush 5B. The scraped off coating layer (coating layer 52A after stretching) is collected in the tray 63.

[Fifth embodiment]
[Coating layer removal device 100C]
A coating layer removal device 100C according to the fifth embodiment will be described.
In the fifth embodiment, the explanation will focus on the differences from the second embodiment, and the explanation of the same items will be omitted or simplified by assigning the same reference numerals.
FIG. 6 is a schematic diagram of an example of a coating layer removing apparatus 100C according to the fifth embodiment. A removal apparatus 100C shown in FIG. 6 is the same as the second embodiment except that the removal means is different from the removal apparatus 100 described in the second embodiment.

<Removal means 30C>
The removing means 30C includes a blasting device 5C and is a means for scraping off the stretched coating layer 52A from the base film 51 with a blasting material.
The blast processing device 5C is provided at any position downstream of the stretched laminated film 50A, and scrapes off the coating layer 52A by spraying a blasting material onto the coating layer (the stretched coating layer 52A).
In the case of FIG. 5, the removing means 30C includes a blasting device 5C and a receiving tray 63 that collects the scraped coating layer 52A together with a blasting material (not shown).
A known blasting device can be used as the blasting device 5C.
Examples of the blasting material include silica particles, calcium carbonate particles, silicon carbide particles, alumina particles, dry ice particles, and melamine resin particles. When dry ice particles are used as the blasting material, the dry ice particles disappear after the blasting process, so it is preferable that there is no need to remove the particles. The particle size of the blasting material is preferably 5 μm or more and 40 μm or less.
The conditions for spraying the blasting material are determined by the material of the coating layer.

When using the coating layer removal device 100C according to the fifth embodiment, the coating layer removal method according to the first embodiment is performed, for example, through the following steps.
In the following, points different from the second embodiment will be mainly explained.

<Removal process>
The removal step is a step of scraping off the coating layer (coating layer 52A after stretching) from the base film 51 with a blasting material.
When the stretched laminated film 50A passes between the blasting device 5C and the guide roll 7, a blasting material (not shown) is sprayed from the blasting device 5C, so that the stretched coating layer 52A becomes the base film. Scraped from 51. The scraped coating layer (coating layer 52A after stretching) is collected in the receiving tray 63 together with the blasting material.

[Sixth embodiment]
[Coating layer removal device 100D]
A coating layer removal device 100D according to the sixth embodiment will be described.
In the sixth embodiment, the explanation will focus on the differences from the second embodiment, and the explanation of the same items will be omitted or simplified by giving the same reference numerals.
FIG. 7 is a schematic diagram of an example of a coating layer removal device 100D according to the sixth embodiment.

A removing device 100D shown in FIG. 7 is similar to the removing device 100 described in the second embodiment except that a steam spraying device is provided between the stretching device and the removing device.

<Steam spraying means>
The steam spraying means is a means for spraying superheated steam toward the coating layer (coating layer 52A after stretching) of the stretched laminated film 50A.
The steam spraying means may include a heater for heating the steam and a steam spraying nozzle for spraying the superheated steam.
The steam spraying means is provided between the stretching means 20 and the removing means 30.

In the case of FIG. 7, the steam blowing means is a superheater 70 having a plurality of steam blowing nozzles 70a and a processing chamber 72. Superheater 70 is provided between boiler 71 and processing chamber 72. The superheater 70 is connected to the boiler 71, heats the steam generated in the boiler 71 to generate superheated steam, and sprays the steam from the steam spray nozzle 70a onto the coating layer (coating layer 52A after stretching) in the processing chamber 72. Spray superheated steam at the target.

When using the coating layer removal device 100D according to the sixth embodiment, the coating layer removal method according to the first embodiment is performed, for example, through the following steps.
In the following, points different from the second embodiment will be mainly explained.

<Steam spraying process>
The steam spraying step is a step of spraying superheated steam toward the coating layer (stretched coating layer 52A) of the stretched laminated film 50A after the stretching step and before the removal step.
In the case of FIG. 7, the stretched laminated film 50A is discharged from the processing chamber 72 and rapidly cooled after superheated steam is sprayed from the steam spray nozzle 70a toward the coating layer 52A. This rapid cooling tends to cause distortion in the coating layer 52A due to the difference in thermal expansion coefficient between the coating layer 52A and the base film 51, and promotes interfacial peeling of the coating layer 52A. As a result, the coating layer 52A is more easily removed from the base film 51 in the subsequent removal step.
The temperature of the superheated steam is preferably 100°C or more and 450°C or less, more preferably 150°C or more and 400°C or less, and even more preferably 200°C or more and 350°C or less.
The spraying time of the superheated steam is determined by the material of the coating layer, the conveyance speed of the laminated film 50, and the like.

[Variation of embodiment]
In the removing devices according to the second to sixth embodiments, the heating means 80 may be provided between the feeding means 10 and the first stretching roll 3A. That is, it is also preferable that the heating means 80 be arranged so as 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.
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 sixth 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 may be a single layer or a multilayer consisting of two or more coating layers of the same or different types. Further, coating layers may be formed on both sides of the base film.
The laminated film preferably has a structure in which the base film and the coating 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, for example, a configuration in which the base film and the coating layer are in direct contact with each other without any other layer between the base film and the coating layer.

<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, 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 still more preferably 20 μm or more and 200 μm or less.

<Coating layer>
Preferably, the coating layer is a functional layer. Examples of the functional layer include a release agent layer, a printing layer, a hard coat layer, an easily adhesive layer, and an adhesive layer. Among these, the coating layer is preferably a release agent layer.
When the coating layer is a 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 an 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 the release agent composition containing a fluorine compound as a main component, examples of the fluorine compound include fluorine silicone compounds, fluorine boron compounds, poly(perfluoroalkylene ether) chain-containing compounds, and the like.

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 the release agent composition containing a thermosetting resin as a main component include a release agent composition containing a melamine resin as a main component and a release agent composition 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 polyorganosiloxane that imparts releasability to the release agent layer. Examples include compositions containing the following. 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.

Further, the coating layer may contain other additives in addition to the resin component described above. Examples of other additives include anti-aging agents, light stabilizers, flame retardants, conductive agents, antistatic agents, and plasticizers.

The thickness of the coating 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 even more preferably 0.05 μm. The thickness is not less than 1.5 μm.

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... 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, 5... Adhesive roll, 5A... Blade, 5B...wire brush, 5C...blasting device, 6...adhesive paper winding roll, 7...guide roll, 10...feeding means, 20...stretching means, 30, 30A, 30B, 30C...removal means, 40...winding up Means, 50, 50A... Laminated film, 51... Base film, 52, 52A... Coating layer, 60... Adhesive sheet, 61... Adhesive sheet with coating layer, 63... Receiver, 70... Superheater, 70a... Steam spray nozzle, 71...Boiler, 72...Processing chamber, 80...Heating means, 100, 100A, 100B, 100C, 100D...Removal device, 522...Crack.

Claims (14)

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 stretched laminated film;
winding up the base film from which the coating layer has been removed into a roll;
How to remove coating layer. The step of removing the coating layer is a step of transferring the coating layer from the base film to the adhesive roll.
The method for removing a coating layer according to claim 1. The step of removing the coating layer is a step of scraping off the coating layer from the base film using a blade or a wire brush.
The method for removing a coating layer according to claim 1. The step of removing the coating layer is a step of scraping the coating layer from the base film with a blasting material.
The method for removing a coating layer according to claim 1. 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 claims 1 to 4. After the step of stretching the laminated film and before the step of removing the coating layer, there is a step of spraying superheated steam toward the coating layer of the stretched laminated film.
The method for removing a coating layer according to any one of claims 1 to 5. 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 claims 1 to 6. 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;
removing means for removing the coating layer from the stretched laminated film;
a winding means for winding the base film into a roll;
Coating layer removal equipment. The removing means includes an adhesive roll and is a means for transferring the coating layer from the base film to the adhesive roll.
The coating layer removal device according to claim 8. The removing means includes a blade or a wire brush and is a means for scraping off the coating layer from the base film.
The coating layer removal device according to claim 8. The removing means includes a blasting device and scrapes the coating layer from the base film with a blasting material.
The coating layer removal device according to claim 8. further comprising water vapor spraying means,
The steam spraying means is a means for spraying superheated steam toward the coating layer of the stretched laminated film.
The coating layer removal device according to any one of claims 8 to 11. The stretching means includes a heating means for heating the laminated film.
The coating layer removal device according to any one of claims 8 to 12. The laminated film is used for manufacturing a ceramic green sheet, and is a laminated film after the ceramic green sheet is peeled from the laminated film.
The coating layer removal device according to any one of claims 8 to 13.

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