EP-4737023-A1 - COATING PEELING DEVICE AND COATING PEELING METHOD

Abstract

Provided are a coating film removing device and a coating film removing method capable of reducing a coating film remaining on a base film. A coating film removing device of the present invention is a coating film removing device that removes a coating film containing a water-soluble resin from a coated film including the coating film on at least one surface of a base film and includes: a conveyance mechanism configured to convey the coated film; a cleaning liquid applying mechanism configured to apply a cleaning liquid to a surface of the coating film; a coating film removing mechanism that is disposed on a downstream side of the cleaning liquid applying mechanism in a conveyance direction, the cleaning liquid applying mechanism being configured to remove the coating film containing the cleaning liquid from the coated film in which the cleaning liquid is applied to the surface of the coating film; a cleaning liquid reapplying mechanism that is disposed on a downstream side of the coating film removing mechanism in the conveyance direction, the cleaning liquid reapplying mechanism being configured to apply the cleaning liquid to the surface of the coating film remaining on the base film; and a suction mechanism that is disposed on a downstream side of the cleaning liquid reapplying mechanism in the conveyance direction, the suction mechanism being configured to suck residues of the coating film remaining on the base film together with the cleaning liquid.

Inventors

• HIGASHIDA, YOSHIHISA
• TANINO, KIYOSHI
• WATANABE, KAZUTAKA

Assignees

• Toray Industries, Inc.

Dates

Publication Date

20260506

Application Date

20240507

Claims (6)

1. A coating film removing device that removes a coating film containing a water-soluble resin from a coated film including the coating film on at least one surface of a base film, the device comprising: a conveyance mechanism configured to convey the coated film; a cleaning liquid applying mechanism configured to apply a cleaning liquid to a surface of the coating film; a coating film removing mechanism that is disposed on a downstream side of the cleaning liquid applying mechanism in a conveyance direction, the cleaning liquid applying mechanism being configured to remove the coating film containing the cleaning liquid from the coated film in which the cleaning liquid is applied to the surface of the coating film; a cleaning liquid reapplying mechanism that is disposed on a downstream side of the coating film removing mechanism in the conveyance direction, the cleaning liquid reapplying mechanism being configured to apply the cleaning liquid to the surface of the coating film remaining on the base film; and a suction mechanism that is disposed on a downstream side of the cleaning liquid reapplying mechanism in the conveyance direction, the suction mechanism being configured to suck residues of the coating film remaining on the base film together with the cleaning liquid.
2. The coating film removing device according to claim 1, wherein the suction mechanism is a suction roll including a tubular main body portion including a hollow portion therein and having a plurality of holes, and a roll layer made of a nonwoven fabric and formed on an outer peripheral portion of the main body portion.
3. The coating film removing device according to claim 2, wherein the suction mechanism includes a speed control mechanism configured to control a rotation speed of the suction roll.
4. The coating film removing device according to claim 2, wherein the suction mechanism includes: a back roll disposed at a position facing the suction roll with the coated film interposed therebetween; and a nip mechanism configured to presses the suction roll and/or the back roll against the coated film.
5. A coating film removing method for removing a coating film containing a water-soluble resin from a coated film including the coating film on at least one surface of a base film using the coating film removing device according to any one of claims 1 to 4, the method comprising: while conveying the coated film, applying a cleaning liquid to a surface of the coating film and bringing the coating film removing mechanism into contact with the surface of the coating film to remove the coating film containing the cleaning liquid; and thereafter, applying the cleaning liquid to the surface remaining on the base film to suck and remove residues of the coating film remaining on the base film together with the cleaning liquid.
6. The coating film removing method according to claim 5, wherein the coating film contains a curable silicone.

Description

Field The present invention relates to a coating film removing device and a coating film removing method capable of efficiently removing a coating film on a surface of a base film. Background While a plastic is used in various fields, a plastic such as a microplastic is considered to be a cause of marine pollutions, and reduction of environmental load by a plastic is urgently needed. In recent years, with evolution of Internet of Things (IoT), the number of electronic devices mounted on computers and smartphones, such as CPU, has increased, and as a result, the number of multilayer ceramic capacitors (MLCCs) required to drive the electronic devices has also rapidly increased. A general method for manufacturing this MLCC includes a step of forming a ceramic green sheet layer on a release film obtained by forming a release layer on a plastic base film using the release film as a carrier sheet, and a step of removing the ceramic green sheet layer to form a ceramic green sheet. In these steps, the release film from which the ceramic sheet has been removed is discarded as an unnecessary material. That is, an increase in the number of release films as a waste due to a rapid increase in the number of manufactured MLCCs in recent years is an environmental problem, and efforts for reuse of a base film have been activated. A component of a release layer contained in the release film generally has a different composition from a component constituting the base film from a viewpoint of releasability. Therefore, when the release film with the release layer is remelted as it is to form a regenerated film, the component of the release layer is present as a foreign substance, and therefore stable film formation cannot be performed. Patent Literature 1 discloses, as a method for removing a release layer containing a water-soluble resin from a release film, a method in which a cleaning liquid in a form of droplets is applied to the release layer, the cleaning liquid is held in the form of droplets on a surface of the release layer, and then the release layer containing the cleaning liquid is removed. Citation List Patent Literature Patent Literature 1: WO 2022/190713 A Summary Technical Problem The removing method of Patent Literature 1 has a problem that when a surface roughness of a base film is large or when there is a scratch, a coating film, particularly a water-soluble resin layer formed in contact with the base film remains, and the quality of the base film as a recycled chip is deteriorated. Therefore, an object of the present invention is to provide a coating film removing device and a coating film removing method capable of reducing a coating film remaining on a base film. Solution to Problem [1] A coating film removing device of the present invention that solves the above problems is a coating film removing device that removes a coating film containing a water-soluble resin from a coated film including the coating film on at least one surface of a base film. The device includes: a conveyance mechanism configured to convey the coated film; a cleaning liquid applying mechanism configured to apply a cleaning liquid to a surface of the coating film; a coating film removing mechanism that is disposed on a downstream side of the cleaning liquid applying mechanism in a conveyance direction, the cleaning liquid applying mechanism being configured to remove the coating film containing the cleaning liquid from the coated film in which the cleaning liquid is applied to the surface of the coating film; a cleaning liquid reapplying mechanism that is disposed on a downstream side of the coating film removing mechanism in the conveyance direction, the cleaning liquid reapplying mechanism being configured to apply the cleaning liquid to the surface of the coating film remaining on the base film; and a suction mechanism that is disposed on a downstream side of the cleaning liquid reapplying mechanism in the conveyance direction, the suction mechanism being configured to suck residues of the coating film remaining on the base film together with the cleaning liquid. The coating film removing device of the present invention is preferably any one of the following [2] to [4].[2] The coating film removing device according to [1}, in which the suction mechanism is a suction roll including a tubular main body portion including a hollow portion therein and having a plurality of holes, and a roll layer made of a nonwoven fabric and formed on an outer peripheral portion of the main body portion.[3] The coating film removing device according to [1] or [2], in which the suction mechanism includes a speed control mechanism configured to control a rotation speed of the suction roll.[4] The coating film removing device according to [2] or [3], in which the suction mechanism includes: a back roll disposed at a position facing the suction roll with the coated film interposed therebetween; and a nip mechanism configured to presses the suction roll an