Apparatus for removing coating layer, and method for removing coating layer

Abstract

To provide an apparatus for removing a coating layer capable of stably processing a large amount of lamination film.SOLUTION: An apparatus 100 for removing a coating layer comprises: a roll delivery shaft 10 for delivering a lamination film 90; a first backup roll 21 that comes into contact with a base material film of the lamination film 90 to carry the lamination film toward the downstream side; a first jet unit 31 including one or more nozzles disposed opposite to the first backup roll 21; a second jet unit 32 including one or more nozzles disposed on the downstream side from the first jet unit, and disposed opposite to a second backup roll 22; a pressurized water feed unit 50 for feeding pressurized water to the first jet unit 31 and the second jet unit 32; and a roll winding shaft 40 for winding a base material film 91 after the coating layer is removed, into a roll shape. The pressurized water feed unit 50 includes one or more pumps.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for removing a coating layer. [Background technology]

[0002] In recent years, from the perspective of protecting global resources and the environment, there has been an increasing movement in various fields to build a recycling-oriented society through efforts such as reducing waste generation, reusing, and recycling. For example, Patent Document 1 discloses a method for recycling plastic products having a coating film, which comprises peeling off the coating film formed on the plastic body from the plastic body with a high-pressure water jet, and then crushing and recycling the plastic body. Patent Document 2 describes a method for applying a pressure of 300 kg / cm to a coating film of a resin molded product to which the coating film is applied. 2 or 2000 kg / cm 2 The present invention discloses a method for removing a coating film from a resin molded product, characterized in that high-pressure water pressurized to a range of 100 to 1500 mm is sprayed through a nozzle. Patent Document 3 describes a method for treating a deteriorated surface layer of a polycarbonate sheet with a pressure of 300 to 2000 kg / cm 2 This publication discloses a method for producing a recycled polycarbonate sheet, which comprises peeling and removing the polycarbonate using a water jet with high-pressure water, and then regenerating the polycarbonate sheet after peeling and removing by hot press molding. Patent Document 4 discloses a coating layer removal device that removes a coating layer from a laminated film having a base film and a coating layer, the coating layer removal device including: a payout means that pays out the laminated film from a roll on which the laminated film is wound; a stretching means that stretches the paid-out laminated film; a removal means that removes the coating layer from the stretched laminated film; and a winding means that winds up the base film into a roll. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-269743 [Patent Document 2] Japanese Patent Application Publication No. 6-246744 [Patent Document 3] Japanese Patent Application Publication No. 7-080839 [Patent Document 4] Japanese Patent Application Publication No. 2023-148861 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Documents 1 to 3 describe methods for removing a layer to be peeled (a coating film, a coating film, or a deteriorated surface layer) from a molded article such as a plastic body using high-pressure water. However, the methods described in Patent Documents 1 to 3 remove the layer to be peeled for each molded article, making it difficult to treat large quantities continuously. In addition, in the method described in Patent Document 1, after the coating film is peeled off, the plastic body is crushed and recycled. In the method described in Patent Document 3, after the deteriorated surface layer is removed, the polycarbonate sheet is recycled by hot press molding. As such, in the methods described in Patent Documents 1 and 3, the plastic body or polycarbonate sheet cannot be reused as is, and the process is complicated. Furthermore, the removal device described in Patent Document 4 is configured to stretch the laminated film with a stretching means and then remove the coating layer with a removing means, and therefore needs to be equipped with a stretching means.

[0005] An object of the present invention is to provide an apparatus and method for removing a coating layer that can stably process a large amount of laminated film. [Means for solving the problem]

[0006] [1] A coating layer removal device for removing a coating layer from a laminated film having a substrate film and a coating layer, a first backup roll disposed downstream of the roll-releasing roll and in contact with the base film of the laminate film to transport the laminate film downstream; a first spray unit including one or more nozzles disposed opposite the first backup roll; a second spray unit disposed downstream of the first spray unit and including one or more nozzles disposed opposite the first backup roll or a second backup roll different from the first backup roll; a pressurized water supply unit that pressurizes water and supplies pressurized water to the first spray unit and the second spray unit; and a roll take-up shaft that takes up the base film after the coating layer has been removed into a roll, wherein the pressurized water supply unit includes one or more pumps, and the first spray unit and the second spray unit are connected to at least one of the one or more pumps. Coating layer removal device. [2] When viewed in the transport direction of the laminated film, the one or more nozzles of the first jetting unit and the one or more nozzles of the second jetting unit are arranged alternately so as not to overlap at least partially with respect to the transport direction of the laminated film. The coating layer removal device according to [1] above. [3] When at least one of the first jetting unit and the second jetting unit includes a plurality of nozzles, the plurality of nozzles are arranged along at least one direction intersecting the conveying direction of the laminated film. The coating layer removal device according to [1] or [2] above. [4] The second spraying unit is arranged so that pressurized water hits an area of ​​the laminated film that was not hit by the pressurized water sprayed from the first spraying unit. The coating layer removal device according to any one of [1] to [3] above. [5] A water recovery and recycling device is provided that recovers and recycles the water sprayed from the first spray unit and the second spray unit, and the water recovery and recycling device is connected to the pressurized water supply unit. The coating layer removal device according to any one of [1] to [4] above. [6] A residual detection device is provided to detect the remaining coating layer, and the residual detection device is disposed downstream of the second backup roll and upstream of the roll winding shaft. The coating layer removal device according to any one of [1] to [5] above. [7] A residue removal device is provided to remove residue from the coating layer, the residue removal device being disposed downstream of the second backup roll and upstream of the roll winding shaft. The coating layer removal device according to any one of [1] to [6] above.

[0007] [8] A method for removing a coating layer, comprising: a step of unwinding a laminated film having a base film and a coating layer from a roll around which the laminated film is wound; a first spraying step of spraying pressurized water toward a first spraying area of ​​the coating layer as the unwound laminated film passes over at least one backup roll, thereby crushing the coating layer; a second spraying step of spraying pressurized water toward a second spraying area of ​​the coating layer, which includes at least an area other than the first spraying area, as the unwound laminated film passes over the at least one backup roll after the first spraying step, thereby crushing the coating layer in the second spraying area that was not crushed in the first spraying step; a step of washing away the crushed coating layer; and a step of winding up the base film into a roll after the coating layer has been washed away. [9] The first spraying step is a step of spraying pressurized water from a first spraying unit including one or more nozzles arranged opposite the at least one backup roll, and the second spraying step is a step of spraying pressurized water from a second spraying unit including one or more nozzles arranged opposite the at least one backup roll, and when viewed in a cross section perpendicular to the central axis of the at least one backup roll that supports the laminated film when the first spraying step and the second spraying step are performed, the spraying direction of the pressurized water sprayed from the first spraying unit and the spraying direction of the pressurized water sprayed from the second spraying unit are perpendicular to the outer circumferential tangent of the backup roll that supports the laminated film. The method for removing a coating layer according to [8] above.

[10] A coating layer removing step is included after the washing step and before the winding step, in which residues of the coating layer are removed. The method for removing a coating layer according to [8] or [9] above.

[11] A step of recovering water used in the first spraying step and the second spraying step; and a step of reusing at least a portion of the recovered water in the first injection step and the second injection step. The method for removing a coating layer according to any one of [8] to

[10] above. [Effects of the Invention]

[0008] According to one aspect of the present invention, it is possible to provide a coating layer removal device and a coating layer removal method that can stably process a large amount of laminated film. [Brief explanation of the drawings]

[0009] [Figure 1A] 1 is a schematic view of a coating layer removal device according to a first embodiment. [Figure 1B] FIG. 2 is a schematic diagram of a first injection unit and a first backup roll when viewed from the downstream side to the upstream side of the transport path of the laminated film in the first embodiment. [Figure 1C] FIG. 3 is a schematic diagram of a second injection unit and a second backup roll when viewed from the downstream side to the upstream side of the transport path of the laminated film in the first embodiment. [Figure 1D] FIG. 2 is a schematic diagram of the injection part and laminated film when viewed from the base end side of the nozzle toward the nozzle tip in the first embodiment. [Figure 2] 1 is a cross-sectional view of an example of a laminated film that can be used in a coating layer removal device. [Figure 3] FIG. 6 is a schematic view of a coating layer removal device according to a second embodiment. [Figure 4] FIG. 10 is a schematic view of a coating layer removal device according to a third embodiment. [Figure 5] 10 is a schematic diagram of the injection part and the laminated film when viewed from the base end side of the nozzle toward the nozzle tip in a modified embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] In this specification, ordinal expressions such as "first" and "second" are intended to distinguish components and do not imply an order. In this specification, expressions without ordinal numbers, such as "injection unit," are a general term for injection units and are used when describing injection units with ordinal numbers such as "first" and "second." For example, when a description is given that applies commonly to multiple configurations expressed with ordinal numbers, such as "first injection unit" and "second injection unit," the "first injection unit" and "second injection unit" are collectively expressed as "injection unit" without the ordinal number.

[0011] [First embodiment] [Coating layer removal device] This embodiment will be described with reference to the drawings. In this embodiment, the X-axis, Y-axis, and Z-axis 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 orthogonal to the predetermined plane. Furthermore, in this embodiment, when directions are indicated based on a view from the front direction of Fig. 1A, Fig. 3, or Fig. 4 parallel to the Y-axis, "up" is the direction of the arrow on the Z-axis, "down" is the opposite direction, "right" is the direction of the arrow on the X-axis, "left" is the opposite direction, "front" is the front direction of Fig. 1A, Fig. 3, or Fig. 4 parallel to the Y-axis, and "rear" is the opposite direction.

[0012] FIG. 1A is a schematic diagram of a coating layer removal device 100 according to this embodiment. The removal device 100 shown in FIG. 1A is a device that removes a coating layer from a laminated film while continuously transporting the laminated film by a roll-to-roll method. FIG. 2 is an example of a cross-sectional view of a laminated film 90 used in the removal device 100. The laminated film 90 has a base film 91 and a coating layer 92. The base film 91 and the coating layer 92 are in direct contact with each other. The base film 91 has a first film surface 91a and a second film surface 91b opposite the first film surface 91a. The coating layer 92 has a first coating surface 92a and a second coating surface 92b opposite the first coating surface 92a. The coating layer 92 is laminated on the base film 91 so that the second coating surface 92b of the coating layer 92 is in contact with the second film surface 91b of the base film 91. The laminated film 90 is not particularly limited as long as it has a base film 91 and a coating layer 92 . The substrate film 91 and the coating layer 92 will be described in detail later.

[0013] The removal device 100 according to this embodiment includes a roll-out shaft 10 that unwinds a laminated film 90, a first backup roll 21 that is disposed downstream of the roll-out shaft 10 and contacts the base film 91 of the laminated film 90 to transport the laminated film 90 downstream, a first spray unit 31 that includes one or more nozzles and faces the first backup roll 21, a second spray unit 32 that is disposed downstream of the first spray unit 31 and faces a second backup roll 22 that is different from the first backup roll 21, a pressurized water supply unit 50 that pressurizes water and supplies pressurized water W3 to the first spray unit 31 and the second spray unit 32, and a roll-up shaft 40 that winds up the base film 91 after the coating layer 92 has been removed. The pressurized water supply unit 50 includes a first supply pump 51 connected to the first spray unit 31 and a second supply pump 52 connected to the second spray unit 32. The removal device 100 also includes a water recovery and recycling device 60, a residue detection device 80, a residue removal device 70, a plurality of guide rolls GR, and a plurality of tension control rolls TR.

[0014] In the removal device 100 of this embodiment, the first spray section 31 and the second spray section 32 are arranged to face the first backup roll 21 and the second backup roll 22, respectively, and when the laminated film 90 passes through the two backup rolls 21, 22, pressurized water W3 is sprayed toward the coating layer 92 from the first spray section 31 and the second spray section 32 in turn. The spraying of pressurized water W3 from sprayers 31 and 32 applies an impact stress (compressive stress) greater than the breaking strength of coating layer 92 to the surface of coating layer 92, resulting in fracture of coating layer 92. In the case of Fig. 1A, the fractured coating layer 92 is washed away by the water flows from first sprayer 31 and second sprayer 32, and residue is removed by residue remover 70, after which only the base film 91 is wound onto roll take-up shaft 40 and recovered. The removal device according to this embodiment can continuously remove the coating layer from the laminated film by a roll-to-roll method, thereby enabling the processing of a large amount of laminated film. Furthermore, the removal device according to this embodiment can remove the coating layer using essentially only water without using chemicals, allowing for stable processing of laminated films. Furthermore, because the removal device according to this embodiment uses essentially only water, there is no need to treat waste liquid containing chemicals, which reduces waste liquid treatment costs and also reduces the impact on the global environment. Furthermore, the removal device according to this embodiment includes two ejection units 31 and 32, each of which includes one or more nozzles, allowing the nozzles to be arranged closely together, thereby improving the ability to remove the coating layer 92.

[0015] Each component of the removal device 100 according to this embodiment will be described.

[0016] <Roll unwinding shaft 10> The roll-paying shaft 10 pays out a roll-shaped laminated film 90. The roll-paying shaft 10 is connected to a drive roller (not shown).

[0017] <First backup roll 21, second backup roll 22> The first backup roll 21 is disposed downstream of the roll supply shaft 10 and upstream of the roll take-up shaft 40. The second backup roll 22 is disposed downstream of the first backup roll 21 and upstream of the roll take-up shaft 40. The backup rolls 21 and 22 are each disposed in contact with the surface of the base film 91 opposite to the coating layer 92 (first film surface 91a). By passing the laminated film 90 over the backup rolls 21 and 22, the play (escape) in the vertical direction (+Z-axis direction in the case of Figure 1A) of the laminated film 90 that occurs when the pressurized water W3 collides with it is eliminated, and the tension in the planar direction of the laminated film 90 is made uniform, thereby maximizing the effect of the collision force of the pressurized water W3. 1A, tension control rolls TR for strongly pressing the laminated film 90 against the first backup roll 21 are disposed on the upstream and downstream sides of the first jetting section 31. Similarly, tension control rolls TR are disposed on the upstream and downstream sides of the second jetting section 32. It is believed that by providing the tension control roll TR, play (escape) in the vertical direction of the laminated film 90 is reduced, and the tension in the surface direction becomes more uniform.

[0018] <First ejection unit 31, second ejection unit 32> The first spraying section 31 includes one or more nozzles arranged opposite the first backup roll 21. The second spraying section 32 includes one or more nozzles arranged opposite the second backup roll 22. The second spraying section 32 is arranged downstream of the first spraying section 31. In this embodiment, when viewed in a cross section perpendicular to the central axis 21a of the first backup roll 21, the central axis of each nozzle of the first injection section 31 is perpendicular to the outer peripheral tangent PT1 of the first backup roll 21. Therefore, the central axis of each nozzle of the first spraying unit 31 is arranged to face the central axis 21a of the first backup roll 21. For example, in FIG. 1B, of the nozzles of the first spraying unit 31, the central axis C1 of the nozzle 31a is shown. Similarly, when viewed in a cross section perpendicular to the central axis 22a of the second backup roll 22, the central axis of each nozzle of the second spraying unit 32 is perpendicular to the outer circumferential tangent PT2 of the second backup roll 22. Therefore, the central axis of each nozzle of the second spraying unit 32 is arranged facing the direction of the central axis 22a of the second backup roll 22. For example, FIG. 1C shows the central axis C2 of nozzle 32a, one of the nozzles of the second spraying unit 32. By arranging the nozzles of the injection sections 31, 32 as described above, the pressurized water W3 collides perpendicularly with the coating layer 92, so that at the point of collision with the coating layer, a greater impact stress is applied to the surface of the coating layer, making the coating layer more likely to be fractured.

[0019] In this embodiment, the spraying units 31 and 32 are disposed in the spraying chambers 301 and 302, respectively, and are configured so that the sprayed water is led to the second tank 63 of the water recovery and recycling device 60 through the outlets 1a and 2a.

[0020] In this embodiment, when at least one of the first spray section 31 and the second spray section 32 includes multiple nozzles, it is preferable that the multiple nozzles are arranged along at least one direction that intersects with the conveying direction of the laminated film 90. In this embodiment, when viewed from the base end of the nozzle toward the nozzle tip (jet nozzle), it is preferable that the width of the spread of the pressurized water sprayed from one or more nozzles of the first spraying unit 31 and one or more nozzles of the second spraying unit 32 does not at least partially overlap with each other within each spraying unit. This prevents the pressurized water sprayed from each nozzle from diffusing and interfering with the spray area of ​​an adjacent nozzle, thereby canceling out the power of the pressurized water before it reaches the laminated film. As a result, the entire coating layer 92 becomes more easily fractured. In this embodiment, when viewed in the transport direction of the laminated film 90 (for example, when viewed from the downstream side to the upstream side of the transport path of the laminated film), it is preferable that the one or more nozzles of the first injection section 31 and the one or more nozzles of the second injection section 32 are arranged so that at least a portion of them do not overlap with respect to the transport direction of the laminated film 90, and it is more preferable that all of the nozzles are arranged so that they do not overlap. Furthermore, in this embodiment, when viewed in the transport direction of the laminated film 90, it is further preferable that the one or more nozzles of the first spray section 31 and the one or more nozzles of the second spray section 32 are arranged alternately so that at least a portion of them do not overlap with each other in the transport direction of the laminated film 90. By arranging the nozzles alternately, the width of the spread of the pressurized water sprayed from each nozzle is shifted from one another, making it easier to crush the entire coating layer 92. In this embodiment, the second spraying unit 32 is preferably positioned so that the pressurized water impinges on areas of the laminated film 90 that were not impinged by the pressurized water sprayed from the first spraying unit 31.

[0021] An example of the nozzle arrangement of the spray units 31 and 32 will be described using Figures 1B, 1C, and 1D. Figure 1B is a schematic diagram of the first spray unit 31 and the first backup roll 21 when viewed from the downstream side to the upstream side of the transport path of the laminated film. Figure 1C is a schematic diagram of the second spray unit 32 and the second backup roll 22 when viewed from the downstream side to the upstream side of the transport path of the laminated film. Figure 1D is a schematic diagram of the spray units 31 and 32 and the laminated film 90 when viewed from the base end side of the nozzle toward the nozzle tip. In the first ejection section 31, five nozzles 31a, 31b, 31c, 31d, and 31e are arranged at equal intervals along the Y-axis direction (FIGS. 1B and 1D). In the second ejection section 32, four nozzles 32a, 32b, 32c, and 32d are arranged at equal intervals along the Y-axis direction (FIGS. 1C and 1D). Note that these nozzles do not have to be arranged at equal intervals.

[0022] As shown in FIG. 1D, arranging the nozzles while shifting them alternately in the X-axis direction and the Y-axis direction is sometimes called a staggered arrangement. By arranging the nozzles in a staggered pattern, even if a region R1 of the laminated film 90 is not hit by the pressurized water W3 sprayed from the first spraying unit 31, the pressurized water W3 sprayed from the second spraying unit 32 in the subsequent step hits the region including the region R1. This allows the entire coating layer 92 to be easily fractured. In FIG. 1D, region R2 indicates the region where the coating layer 92 is fractured.

[0023] In this embodiment, the distance from the nozzle outlets (nozzle tips) of the nozzles arranged in the injection sections 31 and 32 to the backup rolls 21 and 22 (indicated as D1 in Figures 1B and 1C) is preferably 10 mm or more and 300 mm or less, more preferably 30 mm or more and 300 mm or less, and even more preferably 40 mm or more and 150 mm or less. In this embodiment, when the distance from the nozzle outlets (nozzle tips) of the nozzles arranged in the spraying sections 31, 32 to the backup rolls 21, 22 is 300 mm, the spread width of the pressurized water is, for example, 50 mm or more and 700 mm or less. The spread width of the pressurized water means the dimension in the width direction of the backup roll when the pressurized water jetted from the nozzle outlet reaches the surface of the laminated film.

[0024] In this embodiment, the distance between the central axes of the nozzles in the same injection part (shown as P2 in FIG. 1D) is preferably 20 mm or more and 250 mm or less, more preferably 30 mm or more and 200 mm or less. The inner diameter of the nozzle outlet is preferably 0.2 mm or more and 30 mm or less, and more preferably 0.3 mm or more and 10 mm or less. The nozzle shape is not particularly limited, but a contracting nozzle is preferable. A contracting nozzle is a nozzle that sprays water from a contracted nozzle, such as an orifice or a flow nozzle. When the nozzle is a contracting nozzle, the inner diameter of the nozzle outlet is the inner diameter of the contracting part. The nozzle pattern is not particularly limited, but examples include a flat pattern (fan-shaped spray from the nozzle), a full cone pattern (conical spray from the nozzle), and a straight pattern (linear spray from the nozzle). Among these, the nozzle pattern is preferably a flat pattern. When removing a coating layer from a laminate film using a roll-to-roll method as in this embodiment, the flat pattern can crush the coating layer with fewer nozzles than the straight pattern. Furthermore, the flat pattern can crush the coating layer with a smaller amount of water than the full cone pattern.

[0025] In this embodiment, when the spraying units 31 and 32 have a plurality of nozzles along a direction (Y-axis direction) intersecting the conveyance direction of the laminated film 90, the number of nozzles that each of the spraying units 31 and 32 has is preferably 0.4 or more, and more preferably 0.5 to 2.5, per 100 mm width of the laminated film. The number of nozzles that each of the spraying units has may be the same or different. In this embodiment, when viewed from the base end side of the nozzle toward the nozzle tip (injection port), it is preferable that the treated surface of the laminated film 90 is located within the range from the central axis of the nozzles located at both ends of the width direction of the laminated film 90 to the outer edge of the nozzles of all the nozzles possessed by the injection sections 31, 32 (i.e., the width of the laminated film 90 is contained within the range). In the case of FIG. 1D, of all the nozzles possessed by the ejection units 31 and 32, the nozzles arranged at both ends in the width direction of the laminated film 90 are nozzle 31a and nozzle 31e. In FIG. 1D, the laminated film 90 is contained within the range from the central axis C1 of the nozzle 31a to the outer edge L1 of the nozzle 31a, and within the range from the central axis C11 of the nozzle 31e to the outer edge L2 of the nozzle 31e. In the case of FIG. 5 described later, of all the nozzles that the ejection unit has, the nozzles arranged at both ends in the width direction of the laminated film 90 are nozzle 35a and nozzle 35b. In FIG. 5, the laminated film 90 is contained within the range from the central axis C5 of the nozzle 35a to the outer edge L3 of the nozzle 35a, and within the range from the central axis C51 of the nozzle 35b to the outer edge L4 of the nozzle 35b.

[0026] <Pressurized water supply unit 50> The pressurized water supply unit 50 is, for example, a known pressurized water generating device. The "water used for pressurizing water" described in the fourth embodiment can be used as the water pressurized by the pressurized water supply unit 50. The same applies to the second and third embodiments. The pressurized water supply unit 50 includes a water supply source 55, a first tank 53 that stores water W1 supplied from the water supply source 55, a pipe 54 that connects the water supply source 55 and the first tank 53, and two supply pumps 51 and 52. The supply pump 51 is connected to tanks 53 and 63 via pipes 531 and 631, respectively, and is connected to the first spray unit 31 via pipe 511. The supply pump 52 is connected to tanks 53 and 63 via pipes 532 and 632, respectively, and is connected to the second spray unit 32 via pipe 521. The second tank 63 stores used and reclaimed water (also referred to as reclaimed water W2). The pressurized water supply unit 50 uses the water W1 stored in the first tank 53 and the reclaimed water W2 stored in the second tank 63 when generating pressurized water. The pressurized water supply unit 50 pressurizes the water W1 and the reclaimed water W2, and supplies pressurized water W3 to the injection units 31 and 32 via two supply pumps 51 and 52, respectively.

[0027] <Water recovery and recycling device 60> In this embodiment, the water recovery and recycling device 60 separates the water sprayed from the first spray unit 31 and the second spray unit 32 into the crushed coating layer by passing the water through filters 601 and 602. The water recovery and regeneration device 60 includes a second tank 63 for storing the separated water as reclaimed water W2, a first filtration filter 601 and a first recovery pump 61 arranged between the second tank 63 and the first spray chamber 301, and a second filtration filter 602 and a second recovery pump 62 arranged between the second tank 63 and the second spray chamber 302. The second tank 63 is connected to the two supply pumps 51 and 52 of the pressurized water supply unit 50 via pipes 631 and 632.

[0028] <Residue removal device 70> The residue removal device 70 is a device that removes residue from the coating layer 92, and is disposed downstream of the second backup roll 22 and upstream of the roll winding shaft 40. The residue of the coating layer 92 includes, for example, the coating layer 92 remaining on the substrate film 91 in a crushed state, as well as water and foreign matter adhering to the laminated film 90. The residue removal device 70 is not particularly limited, but examples thereof include a water drain nozzle (also called an air knife) and a dryer. The residue removal device 70 only needs to be disposed at least on the side of the crushed coating layer 92. In the case of FIG. 1A, the residue removal device 70 is a pair of drain nozzles.

[0029] <Residual detection device 80> The residue detection device 80 is a device that detects whether the coating layer 92 remains, and is disposed downstream of the second backup roll 22 and upstream of the roll winding shaft 40. The residue detection device 80 is, for example, a film thickness meter that measures the film thickness of the coating layer 92. The residue detection device 80 may have not only the function of detecting residues of the coating layer 92 but also the function of detecting foreign matter.

[0030] <Nip Roll NR1, NR2> In this embodiment, a pair of nip rolls NR1 and NR2 are disposed between the residue removal device 70 and the residue detection device 80.

[0031] <Roll winding shaft 40> The roll take-up shaft 40 takes up the base film 91 in a roll after the coating layer 92 has been removed. The roll take-up shaft 40 is connected to a drive roller (not shown).

[0032] Second Embodiment [Coating layer removal device] A coating layer removal device 100A according to the second embodiment will be described. In the second embodiment, differences from the first embodiment will be mainly described, and explanations of similar items will be omitted or simplified by using the same reference numerals, etc. FIG. 3 is a schematic diagram of a coating layer removal apparatus 100A according to the second embodiment. The removal device 100A according to the second embodiment is similar to the removal device 100 described in the first embodiment, except that both the first spray unit 31 and the second spray unit 32 are arranged to face the first backup roll 21. Therefore, the removal device 100A does not include the second backup roll 22, the second filtration filter 602, the second recovery pump 62, etc.

[0033] <First Ejection Chamber 301A> In the second embodiment, a first spray unit 31, a second spray unit 32, a first backup roll 21, and two tension control rolls TR are arranged in a first spray chamber 301A. The two tension control rolls TR are arranged upstream of the first spray unit 31 and downstream of the second spray unit 32, respectively. In the first spray chamber 301A, the first spray unit 31 and the second spray unit 32 are arranged above the first backup roll 21 (in the +Z-axis direction), and are each arranged opposite the first backup roll 21. In the second embodiment, when viewed in a cross section perpendicular to the central axis 21a of the first backup roll 21, the central axis of the nozzle of the first spray unit 31 (for example, the central axis C1 of the nozzle 31a in FIG. 1B) is perpendicular to the outer circumferential tangent PT1 of the first backup roll 21, and the central axis of the nozzle of the second spray unit 32 (for example, the central axis C2 of the nozzle 32a in FIG. 1C) is perpendicular to the outer circumferential tangent PT2 of the first backup roll 21. The relationships between the central axes of the nozzles of the spray units 31 and 32 and the outer circumferential tangents PT1 and PT2 of the backup roll 21 in the third embodiment are similar to the relationships between the central axes of the nozzles and the outer circumferential tangents PT1 and PT2 in the second embodiment.

[0034] In the second embodiment, the nozzle arrangement of the first ejection unit 31 and the second ejection unit 32 may be, for example, the nozzle arrangement (staggered arrangement) shown in FIG. 1D. When different jetting units are arranged facing the same backup roll as in the second embodiment, the "distance between adjacent nozzles in the Y-axis direction" arranged in adjacent jetting units (first jetting unit 31 and second jetting unit 32 in the case of FIG. 1D) is preferably 10 mm or more and 125 mm or less, more preferably 15 mm or more and 100 mm or less. The "distance between adjacent nozzles in the Y-axis direction" refers to the distance between two loci drawn by the intersections of the central axes of the nozzles and the surface of the laminated film. In the case of Figure 1D, the distance between the two loci is indicated by the distance P1 between the Y coordinates.

[0035] <Water recovery and recycling device 60A> In the second embodiment, the water recovery and regeneration device 60A discharges water sprayed from the first spray unit 31 and the second spray unit 32 from the outlet 1a and regenerates the water by passing it through a first filtration filter 601. The water recovery and regeneration device 60A includes a second tank 63 that stores regenerated water W2, the first filtration filter 601, and a first recovery pump 61.

[0036] The removal device 100A according to the second embodiment has the same effects as those of the first embodiment. Moreover, in the removal device 100A according to the second embodiment, both the first spray unit 31 and the second spray unit 32 are disposed opposite the first backup roll 21, thereby enabling space saving.

[0037] Third Embodiment [Coating layer removal device] A coating layer removal device 100B according to a third embodiment will be described. In the third embodiment, differences from the first and second embodiments will be mainly described, and explanations of similar items will be omitted or simplified by using the same reference numerals, etc. FIG. 4 is a schematic diagram of a coating layer removal apparatus 100B according to the third embodiment. The removal device 100B according to the third embodiment differs from the removal device 100A described in the second embodiment in the positions of the first ejection unit 31 and the second ejection unit 32. Other points are similar to those of the second embodiment.

[0038] <First Ejection Chamber 301B> In the third embodiment, a first spray unit 31, a second spray unit 32, a first backup roll 21, and two tension control rolls TR are arranged in a first spray chamber 301B. The two tension control rolls TR are arranged upstream of the first spray unit 31 and downstream of the second spray unit 32. In the first spray chamber 301B, the first spray unit 31 and the second spray unit 32 are arranged below the first backup roll 21 (in the -Z axis direction).

[0039] In the third embodiment, the nozzle arrangement of the first ejection unit 31 and the second ejection unit 32 can be, for example, the nozzle arrangement (staggered arrangement) shown in FIG. 1D.

[0040] The removal device 100B according to the third embodiment achieves the same effects as those of the first embodiment. Furthermore, in the removal device 100B according to the third embodiment, pressurized water is sprayed toward the coating layer 92 from the sprayers 31 and 32, which are located below the first backup roll 21 (in the −Z-axis direction), making it easier for the crushed coating layer 92 to peel off together with the pressurized water W3. As a result, it is possible to prevent residues of the coating layer 92 from clinging to the laminated film 90 and reaching the residue removal device 70. Furthermore, because the crushed coating layer 92 is easier to peel off as the laminated film 90 passes through the sprayers 31 and 32, it is also possible to recover the base film 91 without using the residue removal device 70. Alternatively, a removal device with a simpler mechanism may be used.

[0041] [Fourth embodiment] [Method for removing coating layer] A method for removing a coating layer according to a fourth embodiment includes the steps of: unwinding a laminated film having a base film and a coating layer from a roll on which the laminated film is wound; a first spraying step of spraying pressurized water toward a first spraying area of ​​the coating layer as the unwound laminated film passes over at least one backup roll, thereby crushing the coating layer; a second spraying step of spraying pressurized water toward a second spraying area of ​​the coating layer, which includes at least an area other than the first spraying area, as the unwound laminated film passes over the at least one backup roll after the first spraying step, thereby crushing the coating layer in the second spraying area that was not crushed in the first spraying step; a step of washing away the crushed coating layer; and a step of winding up the base film into a roll after the coating layer has been washed away.

[0042] The removal method according to the fourth embodiment can be carried out using, for example, the removal device according to the first to third embodiments. In the following description, a case will be described in which the removal method according to the fourth embodiment is carried out using the removal device 100 (FIG. 1A) according to the first embodiment.

[0043] In the removal method according to the fourth embodiment, when the laminated film 90 passes through the first backup roll 21 and the second backup roll 22, pressurized water W3 is sprayed toward the coating layer 92 from the first spraying section 31 and the second spraying section 32 in that order. Therefore, according to the removal method of the fourth embodiment, as in the first embodiment, a large amount of laminated film can be continuously processed using a roll-to-roll method. Furthermore, according to the removal method of this embodiment, the coating layer can be removed using essentially only water, without using chemicals, so laminated film can be processed stably. Furthermore, according to the removal method of this embodiment, since essentially only water is used, there is no need to treat waste liquid containing chemicals, which reduces waste liquid treatment costs and also reduces the impact on the global environment.

[0044] <Water used for pressurized water> In the fourth embodiment, pressurized water is sprayed toward the first and second spraying regions of the coating layer in the first and second spraying steps, for example, to fracture the coating layer. The water used as the pressurized water is preferably ordinary water, i.e., industrial water, and may be purified water or distilled water. It may also be water recycled from wastewater used in various industrial production processes. It may also be water recycled from wastewater used in implementing the fourth embodiment (e.g., recycled water W2 in Figures 1A, 3, and 4). When wastewater is reused, it may be recycled wastewater, as appropriate. The water used for the pressurized water may contain additives that impart functionality as appropriate, but it is preferable that it does not contain additives. Examples of additives include antistatic agents, surfactants, and water-soluble organic solvents. When the water used for the pressurized water contains additives, the concentration of the active ingredient of the additive in the water is preferably 0.2 mass% or less, more preferably 0.1 mass% or less, relative to the total amount of water. Furthermore, it is preferable that the water used for the pressurized water does not contain intentionally added additives. Furthermore, the water used for the pressurized water is preferably not an alkaline aqueous solution prepared by intentionally adding a basic substance, nor is it preferably an acidic aqueous solution prepared by intentionally adding an acidic substance. Because wastewater may be easily recycled, the water used for the pressurized water may contain basic and acidic substances as additives. In this case, the pH of the pressurized water is preferably 5.8 or more and 8.6 or less to comply with the uniform effluent standards (other items) under the Water Pollution Control Act. The temperature of the pressurized water is not particularly limited, and the temperature of the pressurized water may be room temperature.

[0045] <Reeling process> The unwinding step is a step of unwinding the laminated film from a roll on which the laminated film having the substrate film and the coating layer is wound. As the laminated film, for example, a laminated film 90 shown in FIG. 2 can be used. The laminated film 90 may be a laminated film used in the production of a ceramic green sheet, from which a necessary portion of the ceramic green sheet has been peeled off.

[0046] <First Spraying Step, Second Spraying Step> In the first jetting step, pressurized water is jetted toward a first jetting region of the coating layer when the unwound laminated film passes through at least one backup roll, thereby crushing the coating layer. In the second spraying step, pressurized water is sprayed toward a second spraying area of ​​the coating layer, which includes at least an area other than the first spraying area, as the coating layer passes through at least one backup roll after the first spraying step, to crush the coating layer in the second spraying area that was not crushed in the first spraying step. It is preferable that the first spraying step is a step of spraying pressurized water from a first spraying section including one or more nozzles arranged opposite the at least one backup roll, and the second spraying step is a step of spraying pressurized water from a second spraying section including one or more nozzles arranged opposite the at least one backup roll. 1A, 1B, and 1C, the first spraying step involves spraying pressurized water W3 from a first spraying unit 31 including five nozzles arranged opposite to a first backup roll 21. The first spraying step is performed with the first backup roll 21 in contact with the surface of the base film 91 opposite the coating layer 92 of the laminate film 90. In the second spraying step, pressurized water W3 is sprayed from a second spraying unit 32 including four nozzles arranged opposite to the second backup roll 22. The second spraying step is performed with the second backup roll 22 in contact with the surface of the base film 91 opposite the coating layer 92 of the laminated film 90.

[0047] In the first and second spraying steps, the nozzle pressure is preferably 3.0 MPa or more and 70 MPa or less, more preferably 10 MPa or more and 50 MPa or less. The nozzle pressure used in the first spraying step and the nozzle pressure used in the second spraying step may be the same as or different from each other.

[0048] In the fourth embodiment, when the first spraying step and the second spraying step are performed on the at least one backup roll, when viewed in a cross section perpendicular to the central axis of the backup roll supporting the laminated film, it is preferable that the spraying direction of the pressurized water sprayed from the first spraying section and the spraying direction of the pressurized water sprayed from the second spraying section are perpendicular to the outer circumferential tangent of the backup roll supporting the laminated film (for example, PT1 and PT2 in the case of Figure 1A).

[0049] <Rinsing process> The washing step is a step of washing away the broken coating layer together with pressurized water W3 sprayed toward the first spray area and the second spray area. The washing step is a step of washing away at least a portion of the crushed coating layer. 1A, in the washing-off process, the coating layer 92 broken up by the jetting of pressurized water W3 from the first jetting unit 31 is washed away together with the pressurized water W3, and then the coating layer 92 broken up by the jetting of pressurized water W3 from the second jetting unit 32 is washed away together with the pressurized water W3. The washed-off coating layer 92 is discharged from the discharge ports 1a and 2a of the jetting chambers 301 and 302, respectively. In the washing-off process, as in the third embodiment, pressurized water W3 is sprayed toward the coating layer 92 from spraying sections 31, 32 located below the first backup roll 21 (in the -Z axis direction), making the crushed coating layer 92 easier to wash away (easier to peel off).

[0050] <Coating layer removal process> In the fourth embodiment, it is preferable to have a coating layer removing step of removing the residue of the coating layer after the washing step and before the winding step. The coating layer removal step is a step of removing the coating layer residue that was not washed away in the washing step. Examples of the process for removing the residue of the coating layer include a process for blowing off the coating layer 92 remaining on the substrate film 91 in a crushed state, and a process for drying the water adhering to the substrate film 91. In the case of Figure 1A, the coating layer removal process involves blowing air from a pair of water drain nozzles (an example of a residue removal device 70) onto both sides of the laminated film 90 discharged from the second spray chamber 302, blowing away the crushed coating layer, thereby removing the coating layer residue.

[0051] <Recovery process, reuse process> The removal method according to the fourth embodiment preferably includes a step of recovering the water used in the first spraying step and the second spraying step, and a step of reusing at least a portion of the recovered water in the first spraying step and the second spraying step. 1A, the water sprayed from the first spray unit 31 and the second spray unit 32 is discharged from the outlets 1a and 2a of the spray chambers 301 and 302, respectively, and filtered and regenerated by the filtration filters 601 and 602. The filtered water (regenerated water W2) is supplied to the second tank 63 by the recovery pumps 61 and 62 (recovery step). The regenerated water W2 is used to generate pressurized water in the pressurized water supply unit 50, and is reused in the first spray step and the second spray step (reuse step).

[0052] <Winding process> In the winding step, the substrate film after the coating layer has been removed is wound into a roll. In the case of Fig. 1A, the substrate film 91 is wound into a roll by a roll winding shaft 40. The wound substrate film 91 can be recycled into the resin that constitutes the substrate film 91, for example, by material recycling and chemical recycling.

[0053] [Modifications of the embodiment] In the removal device according to the above-described embodiment, an aspect has been described in which the ejection unit includes two ejection units (first ejection unit 31 and second ejection unit 32), but the device may include, for example, three or more ejection units. The number of ejection units is, for example, 2 to 20, and preferably 2 to 10. The two or more ejection units may be arranged so as to face one backup roll, as in FIGS. 3 and 4, or may be divided into two or more backup rolls and arranged so as to face the backup rolls, respectively, as in FIG. 1A.

[0054] An example of an ejection unit having five ejection units will be described with reference to FIG. 5 shows the nozzles and laminated film when viewed from the base end of the nozzle toward the nozzle tip (jet nozzle). A first jetting unit 31, a second jetting unit 32, a third jetting unit 33, a fourth jetting unit 34, and a fifth jetting unit 35 are arranged in this order from the upstream side in the conveyance direction (+X-axis direction) of the laminated film 90. The single nozzle 31a of the first injection unit 31 is positioned at the center of the width direction (Y-axis direction) of the laminated film, the two nozzles 32a, 32b of the second injection unit 32 are positioned one each in the -Y-axis direction and +Y-axis direction relative to nozzle 31a, the two nozzles 33a, 33b of the third injection unit 33 are positioned one each in the -Y-axis direction and +Y-axis direction relative to nozzles 32a, 32b, the two nozzles 34a, 34b of the fourth injection unit 34 are positioned one each in the -Y-axis direction and +Y-axis direction relative to nozzles 33a, 33b, and the two nozzles 35a, 35b of the fifth injection unit 35 are positioned one each in the -Y-axis direction and +Y-axis direction relative to nozzles 34a, 34b. As shown in Figure 5, the nozzle 31a of the first spray unit 31 is positioned at the center of the width of the laminated film, and the nozzles are shifted in an inverted V shape from that center to the fifth spray unit 35, widening outward toward both ends of the width of the laminated film 90 (in the -Y axis direction and +Y axis direction), thereby achieving the following effects. In the spraying sections excluding the first spraying section 31 at the front (the second spraying section 32 to the fifth spraying section 35 in the case of Figure 5), when the pressurized water hits the coating layer 92, the coating layer 92 has already been fractured in the spraying area downstream of the spraying section, making it easier for the spraying section to fracture the coating layer 92 starting from this fracture point. This allows the pressure of the pressurized water to be reduced without including the first spraying section 31, potentially resulting in energy savings. Furthermore, by arranging the spraying sections as shown in Figure 5, the fractured coating layer can be naturally washed away toward both ends of the laminated film 90 in the width direction, reducing the burden on the residue removal device 70.

[0055] In the removal device according to the above-described embodiment, the areas hit by the pressurized water jetted from the nozzles of different jetting units may partially overlap as long as the effect of this embodiment is not impaired.

[0056] In the removal device according to the above embodiment, the pressurized water supply unit 50 uses both the water W1 stored in the first tank 53 and the reclaimed water W2 stored in the second tank 63. However, the pressurized water supply unit 50 may generate pressurized water using either the water W1 or the reclaimed water W2. The pressurized water supply unit 50 may include at least one pump that supplies pressurized water to each injection unit.

[0057] Although the removal device according to the above embodiment includes the residue removal device 70, the residue removal device 70 is an optional device. The removal device according to the above embodiment does not necessarily need to include the residue removal device 70.

[0058] In the removal method according to the above-described embodiment, a mode of removing the coating layer using a removal device (FIGS. 1A, 3, and 4) equipped with both the roll unwinding shaft 10 and the roll winding shaft 40 has been described. However, instead of the removal device, an apparatus system may be used in which an apparatus that performs a pre-process (e.g., a green sheet laminating apparatus) and the removal device according to the above-described embodiment are integrated. In the following description, a specific example of an apparatus system will be described, with an apparatus that performs the pre-processing referred to as a "pre-processing apparatus" and the removal apparatus according to the above-described embodiment referred to as a "removal apparatus." When applying the removal method in the above-described embodiment, the removal method according to the above-described embodiment can be applied to a combination of a front-end process performing device including (a) a roll feed shaft for the front-end process performing device and (b) a roll take-up shaft for the front-end process performing device, and a removal device including (c) a roll feed shaft for the removal device (reference numeral 10 in FIGS. 1A, 3, and 4) and (d) a roll take-up shaft for the removal device (reference numeral 40 in FIGS. 1A, 3, and 4). In contrast, in this modified example, the removal method according to the above-described embodiment is applied to a combined device system in which the front-end process performing device and the removal device are connected, omitting the (b) roll take-up shaft and the (c) roll feed shaft. In this modified example, the process of unwinding the laminated film is performed by the (a) roll feed shaft of the front-end process performing device. By using such an apparatus system (composite apparatus) to carry out the removal method according to the above-described embodiment, the manufacturing process of the multilayer ceramic capacitor (MLCC) and the coating layer removal process can be carried out seamlessly using a roll-to-roll method, thereby making it possible to significantly reduce operating costs.

[0059] The present invention is not limited to the above-described embodiment, and may include modifications and improvements within the scope of achieving the object of the present invention.

[0060] The structure of the laminated film will be described.

[0061] [Laminated film] The laminated film used in the above-described embodiment has a substrate 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. From the viewpoint of facilitating removal of the coating layer from the laminate film and recovery of the remaining substrate film, the laminate film preferably has a configuration in which the substrate film and the coating layer are directly laminated together. Here, "directly laminated" refers to, for example, a configuration in which the substrate film and the coating layer are in direct contact with each other without any other layer between them.

[0062] <Base film> The substrate film is a resin film formed from the resin component to be recovered. Examples of the resin film 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 (EVA) film; ethylene-(meth)acrylic acid copolymer film; ethylene-(meth)acrylic acid ester copolymer film; cycloolefin polymer film; polyurethane film; polyphenylene sulfide film; cellophane; and the like. Among the substrate films, polyester films are preferred because of their excellent heat resistance and strength. As the polyester film, polyester films containing polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate as the main component are preferred because the resin can be easily recovered and recycled. In this specification, the term "main component" or "principal component" means that the proportion of the main component to the total mass of the material is 50% by mass or more. The resin film may also contain known fillers, colorants, antistatic agents, antioxidants, organic lubricants, catalysts, etc. The resin film may be transparent or may be colored as desired. At least one surface of the substrate film may be subjected to a surface treatment such as sputtering, corona discharge, flame, ultraviolet irradiation, electron beam irradiation, or etching such as oxidation, as needed.

[0063] The thickness of the substrate 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.

[0064] <Coating layer> The coating layer is preferably a functional layer. Examples of functional layers include a release agent layer, a printing layer, a hard coat layer, an easy-adhesion layer, and a pressure-sensitive 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 releasability, and examples thereof include release agent compositions containing as a main component a silicone compound, a fluorine compound, a long-chain alkyl group-containing compound, or a thermoplastic resin material such as an olefin resin or a diene resin. It is also preferable to use a release agent composition containing as a main component an energy ray-curable or thermosetting resin. These release agent compositions may be used alone or in combination of two or more.

[0065] In the release agent composition containing a silicone compound as a main component, the silicone compound may be a silicone compound having an organopolysiloxane as a basic skeleton. Examples of the silicone compound include heat-curable silicone compounds such as addition reaction type and condensation reaction type; and energy beam-curable silicone compounds such as ultraviolet-curable and electron beam-curable types.

[0066] In the release agent composition containing a fluorine compound as a main component, the fluorine compound may include a fluorine silicone compound, a fluorine boron compound, and a compound containing a poly(perfluoroalkylene ether) chain.

[0067] In the release agent composition containing a long-chain alkyl group-containing compound as a main component, examples of the long-chain alkyl group-containing compound include polyvinyl carbamate obtained by reacting a polyvinyl alcohol polymer with a long-chain alkyl isocyanate, alkyl urea derivatives obtained by reacting a polyethyleneimine with a long-chain alkyl isocyanate, and copolymers of long-chain alkyl (meth)acrylates. Furthermore, a long-chain alkyl-modified alkyd resin may be used, which is an alkyd resin obtained by the condensation reaction of a polyhydric alcohol and a polybasic acid and which uses a long-chain fatty acid as a modifier.

[0068] A preferred example of a release agent composition containing an energy ray-curable resin as a primary component is one containing 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. In a release agent layer formed from this release agent composition, an energy ray-curable compound and a polyorganosiloxane having different molecular structures, polarities, and molecular weights are used. Therefore, before curing, components derived from the polyorganosiloxane are segregated near the outer surface of the release agent layer, and then cured by energy rays, solidifying the segregation. This improves the releasability of the release agent layer. A release agent composition containing an energy ray-curable resin as a primary component may further contain a photopolymerization initiator.

[0069] Examples of release agent compositions containing a thermosetting resin as a primary component include release agent compositions containing a melamine resin as a primary component and release agent compositions containing an epoxy resin as a primary component. Release agent compositions containing a melamine resin as a primary component include compositions containing a melamine resin as a primary component, an acid catalyst for thermally curing the melamine resin, and a polyorganosiloxane that imparts release properties to the release agent layer. Furthermore, release agent compositions containing an epoxy resin as a primary component include compositions containing an epoxy resin as a primary component, an acid or basic thermosetting catalyst for thermally curing the epoxy resin, and a polyorganosiloxane that imparts release properties to the release agent layer. Before curing, components derived from the polyorganosiloxane segregate near the outer surface of the release agent layer, and then cure to solidify the segregation. This improves the release properties of the release agent layer.

[0070] The coating layer may contain other additives in addition to the resin component, such as an antioxidant, a light stabilizer, a flame retardant, a conductive agent, an antistatic agent, and a plasticizer.

[0071] The thickness of the coating layer can be selected appropriately and is not particularly limited, but is, 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 or more and 1.5 μm or less.

[0072] The laminate film used in each embodiment is generally used for the purpose of protecting the surfaces of other functional sheets or various parts used for specific purposes during the manufacture, transportation, storage, etc. of these functional sheets or parts. In fact, after fulfilling its role of protecting these parts, it is often peeled off from the surface and discarded. Therefore, by using the laminate film, the coating layer and the base film can be easily separated from the laminate film, which is an application that greatly contributes from the viewpoints of resource conservation and environmental protection. [Explanation of symbols]

[0073] 10...roll unwinding shaft, 21...first backup roll, 22...second backup roll, 31...first spray unit, 32...second spray unit, 33...third spray unit, 34...fourth spray unit, 35...fifth spray unit, 40...roll winding shaft, 50...pressurized water supply unit, 51...first supply pump, 52...second supply pump, 53...first tank, 54...piping, 55...water supply source, 60, 60A...water recovery and recycling device, 61...first recovery pump, 62...second recovery pump, 63...second tank, 70 ...residue removal device, 80...residue detection device, 90...laminated film, 91...base film, 92...coating layer, 100, 100A, 100B...removal device, 301...first spray chamber, 302...second spray chamber, 511, 521, 531, 532, 631, 632...piping, 601...first filtration filter, 602...second filtration filter, 1a, 2a...discharge port, 21a, 22a...central axis, nozzle...31a-31e, 32a-32d, 33a-33b, 34a-34b, 35a-35b.

Claims

1. 1. A coating layer removal device for removing a coating layer from a laminated film having a substrate film and a coating layer, comprising: a roll-out shaft that unwinds the laminated film; a first backup roll disposed downstream of the roll-releasing shaft, in contact with the base film of the laminate film, and transporting the laminate film downstream; a first jetting unit including one or more nozzles arranged opposite the first backup roll; and a second jetting unit including one or more nozzles arranged downstream of the first jetting unit and opposite the first backup roll or a second backup roll different from the first backup roll; a pressurized water supply unit that pressurizes water and supplies pressurized water to the first injection unit and the second injection unit; a roll winding shaft that winds up the base film into a roll after the coating layer has been removed, the pressurized water supply includes one or more pumps; the first injection unit and the second injection unit are connected to at least one of the one or more pumps; Coating layer removal device.

2. When viewed in the transport direction of the laminate film, the one or more nozzles of the first jetting unit and the one or more nozzles of the second jetting unit are arranged alternately so as not to overlap at least partially with each other in the transport direction of the laminate film. The coating layer removal device according to claim 1 .

3. When at least one of the first injection unit and the second injection unit includes a plurality of nozzles, the plurality of nozzles are arranged along at least one direction intersecting with the transport direction of the laminated film. The coating layer removing device according to claim 1 or 2.

4. the second spraying unit is arranged so that pressurized water impinges on an area of ​​the laminated film that has not been impinged by the pressurized water sprayed from the first spraying unit; The coating layer removing device according to claim 1 or 2.

5. a water recovery and recycling device that recovers and recycles water sprayed from the first spray unit and the second spray unit; The water recovery and recycling device is connected to the pressurized water supply unit. The coating layer removing device according to claim 1 or 2.

6. a residue detection device for detecting the residue of the coating layer, the remaining part detection device is disposed downstream of the second backup roll and upstream of the roll winding shaft. The coating layer removing device according to claim 1 or 2.

7. a residue removal device for removing residues of the coating layer; the residue removal device is disposed downstream of the second backup roll and upstream of the roll winding shaft. The coating layer removing device according to claim 1 or 2.

8. a step of unwinding a laminate film having a substrate film and a coating layer from a roll on which the laminate film is wound; a first spraying step of spraying pressurized water toward a first spray area of ​​the coating layer when the unwound laminated film passes through at least one backup roll, thereby crushing the coating layer; a second spraying step in which, after the first spraying step, pressurized water is sprayed toward a second spraying area of ​​the coating layer including at least an area other than the first spraying area when the coating layer passes through the at least one backup roll, thereby crushing the coating layer in the second spraying area that has not been crushed in the first spraying step; Washing away the crushed coating layer; and winding up the substrate film into a roll after the coating layer has been washed away. How to remove the coating layer.

9. the first spraying step is a step of spraying pressurized water from a first spraying unit including one or more nozzles arranged opposite the at least one backup roll, the second spraying step is a step of spraying pressurized water from a second spraying unit including one or more nozzles arranged opposite the at least one backup roll, When viewed in a cross section perpendicular to a central axis of the backup roll supporting the laminated film when the first spraying step and the second spraying step are performed, the spraying direction of the pressurized water sprayed from the first spraying section and the spraying direction of the pressurized water sprayed from the second spraying section are perpendicular to a tangent to an outer periphery of the backup roll supporting the laminated film. The method for removing a coating layer according to claim 8.

10. a coating layer removing step of removing residue of the coating layer after the washing step and before the winding step; The method for removing a coating layer according to claim 8 or 9.

11. a step of recovering water used in the first spraying step and the second spraying step; and a step of reusing at least a portion of the recovered water in the first injection step and the second injection step. The method for removing a coating layer according to claim 8 or 9.

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