Coating layer removal device and coating layer removal method

Abstract

A coating layer removal device 100 includes: a roll-out shaft 10 that rolls out a laminated film 90; a first backup roll 21 that contacts a base film of the laminated film 90 and transports the laminated film downstream; a first spray unit 31 that is disposed facing the first backup roll 21 and that includes one or more nozzles; a second spray unit 32 that is disposed downstream of the first spray unit, is disposed facing a second backup roll 22 and includes one or more nozzles; a pressurized water supply unit 50 that supplies pressurized water to the first spray unit 31 and the second spray unit 32; and a roll take-up shaft 40 that takes up the base film 91 into a roll shape after the coating layer has been removed. The pressurized water supply unit 50 includes one or more pumps.

Description

Coating layer removal device and coating layer removal method

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

[0002] In recent years, from the viewpoint of global resource conservation and environmental protection, 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 a coating film formed on a plastic body from the plastic body with a high-pressure water jet, and then crushing and recycling the plastic body. Patent Document 2 discloses a method for recycling plastic products having a coating film, which comprises spraying a high-pressure water jet of 300 kg / cm onto the coating film of a resin molded product to which the coating film has been applied. ２ or 2000 kg / cm ２ Patent Document 3 discloses a method for removing a coating film from a resin molded product, which is characterized by spraying high-pressure water pressurized to a range of 300 to 2000 kg / cm through a nozzle. ２ and regenerating the polycarbonate sheet by hot press molding.Patent Document 4 discloses a coating layer removal device for removing a coating layer from a laminate film having a base film and a coating layer, the coating layer removal device including: a payout means for paying out the laminate film from a roll around which the laminate film is wound; a stretching means for stretching the paid-out laminate film; a removal means for removing the coating layer from the stretched laminate film; and a winding means for winding up the base film into a roll.

[0003] JP 5-269743, JP 6-246744, JP 7-080839, JP 2023-148861

[0004] Patent Documents 1 to 3 describe methods for removing a layer to be peeled (a coating film, a covering film, or a deteriorated surface layer) from a molded product 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 product, making it difficult to process large quantities continuously. Furthermore, 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, the methods described in Patent Documents 1 and 3 do not allow the plastic body or polycarbonate sheet to 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 removal means, so it requires 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.

[0006] a first backup roll disposed downstream of the roll-out roll and abutting the base film of the laminated film to transport the laminated 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 the pressurized water to the first spray unit and the second spray unit; and a roll take-up shaft that winds 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. [2] The coating layer removal device according to [1], wherein, when viewed in the transport direction of the laminated film, one or more nozzles of the first spray unit and one or more nozzles of the second spray unit are arranged alternately so as not to overlap at least partially with respect to the transport direction of the laminated film. [3] The coating layer removal device according to [1] or [2], wherein, when at least one of the first spray unit and the second spray unit includes multiple nozzles, the multiple nozzles are arranged along at least one direction intersecting the transport direction of the laminated film. [4] The coating layer removal device according to any one of [1] to [3], wherein the second spray unit is arranged so that pressurized water sprayed from the first spray unit hits areas of the laminated film that were not hit by the pressurized water. [5] The coating layer removal device according to any one of [1] to [4], further comprising 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 being connected to the pressurized water supply unit.[6] The coating layer removal device according to any one of [1] to [5], further comprising a residue detection device that detects the residue of the coating layer, the residue detection device being arranged downstream of the second backup roll and upstream of the roll winding shaft. [7] The coating layer removal device according to any one of [1] to [6], further comprising a residue removal device that removes the residue of the coating layer, the residue removal device being arranged downstream of the second backup roll and upstream of the roll winding shaft.

[0007] [8] A method for removing a coating layer, comprising: a step of unwinding a laminate film having a base film and a coating layer from a roll around which the laminate film is wound; a first spraying step of spraying pressurized water toward a first spray area of ​​the coating layer as the unwound laminate film passes over at least one backup roll, thereby crushing the coating layer; a second spraying step of spraying pressurized water toward a second spray area of ​​the coating layer, which includes at least an area other than the first spray area, as the unwound laminate film passes over the at least one backup roll after the first spraying step, thereby crushing the coating layer in the second spray 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 method for removing a coating layer according to [8], wherein the first spraying step is a step of spraying pressurized water from a first spray 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 spray unit including one or more nozzles arranged opposite the at least one backup roll, and when viewed in a cross section of the at least one backup roll in a direction perpendicular to the central axis of the backup roll that supports the laminate film when the first spraying step and the second spraying step are performed, the spraying direction of the pressurized water sprayed from the first spray unit and the second spraying unit is perpendicular to a tangent to the outer periphery of the backup roll that supports the laminate film.

[10] The method for removing a coating layer according to [8] or [9], further comprising a coating layer removal step of removing residue of the coating layer after the washing step and before the winding step.

[11] The method for removing a coating layer according to any one of [8] to

[10] , comprising: 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 spraying step and the second spraying step.

[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.

[0009] FIG. 1 is a schematic diagram of a coating layer removal device according to a first embodiment; 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 a transport path of a laminated film in the first embodiment; 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 a transport path of a laminated film in the first embodiment; FIG. 4 is a schematic diagram of a injection unit and a laminated film when viewed from the base end side of a nozzle toward the nozzle tip in the first embodiment; FIG. 5 is a schematic diagram of an example of a cross-sectional view of a laminated film that can be used in a coating layer removal device; FIG. 6 is a schematic diagram of a coating layer removal device according to a second embodiment; FIG. 7 is a schematic diagram of a coating layer removal device according to a third embodiment; FIG. 8 is a schematic diagram of a injection unit and a laminated film when viewed from the base end side of a nozzle toward the nozzle tip in a modified embodiment.

[0010] In this specification, expressions using ordinal numbers such as "first" and "second" are intended to distinguish between components and do not indicate order. In this specification, expressions without an ordinal number, 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 components 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 perpendicular to the predetermined plane. Furthermore, in this embodiment, when viewed from the front direction of FIG. 1A, FIG. 3, or FIG. 4 parallel to the Y-axis, "up" refers to the direction of the arrow on the Z-axis, "down" refers to the opposite direction, "right" refers to the direction of the arrow on the X-axis, and "left" refers to the opposite direction, "front" refers to the front direction of FIG. 1A, FIG. 3, or FIG. 4 parallel to the Y-axis, and "rear" refers to the opposite direction.

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

[0013] The removal device 100 according to this embodiment includes a roll-out shaft 10 that unwinds a laminate 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 laminate film 90 to transport the laminate film 90 downstream, a first spray unit 31 that includes one or more nozzles and is disposed opposite the first backup roll 21, a second spray unit 32 that is disposed downstream of the first spray unit 31 and includes one or more nozzles and is disposed opposite 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 into a roll 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 according to this embodiment, the first spray unit 31 and the second spray unit 32 are disposed opposite the first backup roll 21 and the second backup roll 22, respectively. As the laminate film 90 passes between the two backup rolls 21 and 22, pressurized water W3 is sprayed sequentially from the first spray unit 31 and the second spray unit 32 toward the coating layer 92. The spraying of the pressurized water W3 from the spray units 31 and 32 applies impact stress (compressive stress) greater than the rupture strength of the coating layer 92 to the surface of the coating layer 92, causing the coating layer 92 to fracture. In the case of FIG. 1A , the fractured coating layer 92 is washed away by the water flow from the first spray unit 31 and the second spray unit 32, and residue is removed by the residue removal device 70. After that, only the substrate film 91 is wound around the roll take-up shaft 40 and recovered. The removal device according to this embodiment enables continuous removal of the coating layer from the laminate film using a roll-to-roll process. As a result, a large amount of laminated film can be processed. 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 film. Furthermore, since 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 further reduces the impact on the global environment. Furthermore, the removal device according to this embodiment includes two spray units 31 and 32, each of which includes one or more nozzles, allowing the nozzles to be densely arranged. As a result, the removal capability of the coating layer 92 can be improved.

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

[0016] <Roll Payout Shaft 10> The roll payout shaft 10 pays out the roll-shaped laminate film 90. The roll payout 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 payout 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 the coating layer 92 (first film surface 91a). By stretching the laminate film 90 over the backup rolls 21 and 22, play (escape) in the vertical direction (+Z-axis direction in the case of FIG. 1A ) of the laminate film 90 caused by the collision of the pressurized water W3 is eliminated, and the tension in the plane direction of the laminate 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 upstream and downstream of the first jetting section 31. Similar tension control rolls TR are disposed upstream and downstream of the second jetting section 32. It is believed that the provision of the tension control rolls TR reduces play (escape) in the vertical direction of the laminated film 90, making the tension in the surface direction more uniform.

[0018] <First Injection Unit 31, Second Injection Unit 32> The first injection unit 31 includes one or more nozzles arranged opposite the first backup roll 21. The second injection unit 32 includes one or more nozzles arranged opposite the second backup roll 22. The second injection unit 32 is arranged downstream of the first injection unit 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 unit 31 is perpendicular to the outer circumferential tangent PT1 of the first backup roll 21. Therefore, the central axis of each nozzle of the first injection unit 31 is arranged facing the central axis 21a of the first backup roll 21. For example, FIG. 1B shows the central axis C1 of nozzle 31a among the nozzles of the first injection unit 31. 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 spray 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 spray unit 32 is arranged to face the central axis 22a of the second backup roll 22. For example, FIG. 1C shows the central axis C2 of nozzle 32a of the nozzles of the second spray unit 32. By arranging the nozzles of the spray units 31 and 32 as described above, the pressurized water W3 collides perpendicularly with the coating layer 92, which imparts a greater impact stress to the surface of the coating layer at the point of collision with the coating layer, making the coating layer more likely to fracture.

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

[0020] In this embodiment, when at least one of the first spray unit 31 and the second spray unit 32 includes multiple nozzles, the multiple nozzles are preferably arranged along at least one direction intersecting the conveyance direction of the laminated film 90. In this embodiment, when viewed from the base end of the nozzle toward the nozzle tip (jet nozzle), the width of the pressurized water sprayed from one or more nozzles of the first spray unit 31 and one or more nozzles of the second spray unit 32 preferably does not at least partially overlap with each other within each spray 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 laminate film 90 (e.g., when viewed from downstream to upstream along the transport path of the laminate film), it is preferable that the one or more nozzles of the first spray unit 31 and the one or more nozzles of the second spray unit 32 are arranged so that they do not at least partially overlap with each other in the transport direction of the laminate film 90, and it is more preferable that all nozzles are arranged so that they do not overlap. Furthermore, in this embodiment, it is even more preferable that the one or more nozzles of the first spray unit 31 and the one or more nozzles of the second spray unit 32 are arranged alternately with each other in the transport direction of the laminate film 90 so that they do not at least partially overlap with each other in the transport direction of the laminate film 90. By arranging the nozzles alternately, the spread widths of the pressurized water sprayed from each nozzle are offset from each other, making it easier to fracture the entire coating layer 92. In this embodiment, it is preferable that the second spray unit 32 be arranged so that the pressurized water hits areas of the laminate film 90 that were not hit by the pressurized water sprayed from the first spray unit 31.

[0021] An example of the nozzle arrangement of the spraying units 31 and 32 will be described using FIGS. 1B, 1C, and 1D. FIG. 1B is a schematic diagram of the first spraying unit 31 and the first backup roll 21 when viewed from downstream to upstream along the transport path of the laminated film. FIG. 1C is a schematic diagram of the second spraying unit 32 and the second backup roll 22 when viewed from downstream to upstream along the transport path of the laminated film. FIG. 1D is a schematic diagram of the spraying units 31 and 32 and the laminated film 90 when viewed from the base end of the nozzle toward the nozzle tip. In the first spraying unit 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 spraying unit 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 Figure 1D, arranging the nozzles so that they are alternately shifted in the X-axis and Y-axis directions is sometimes referred to as a staggered arrangement. By arranging the nozzles in a staggered arrangement, 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 second spraying unit 32 will hit the region including this region R1. This allows the entire coating layer 92 to be easily fractured. In Figure 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 spraying sections 31, 32 to the backup rolls 21, 22 (shown 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 sprayed from the nozzle outlet reaches the surface of the laminated film.

[0024] In this embodiment, the distance between the central axes of nozzles in the same spray section (indicated by 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, more preferably 0.3 mm or more and 10 mm or less. The nozzle shape is not particularly limited, but a contraction nozzle is preferable. A contraction nozzle refers to a nozzle that sprays water from a contracted nozzle, such as an orifice or a flow nozzle. When the nozzle is a contraction nozzle, the inner diameter of the nozzle outlet is the inner diameter of the contraction section. 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, a flat pattern is preferable. When removing a coating layer from a laminated 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 and with a smaller amount of water than the full cone pattern.

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

[0026] <Pressurized Water Supply Unit 50> The pressurized water supply unit 50 is, for example, a known pressurized water generator. The water pressurized by the pressurized water supply unit 50 can be the "water used for pressurizing water" described in the fourth embodiment. This is also true for 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 the tanks 53 and 63 via pipes 531 and 631, respectively, and to the first spray unit 31 via pipe 511. The supply pump 52 is connected to the tanks 53 and 63 via pipes 532 and 632, respectively, and 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 generates pressurized water by using water W1 stored in a first tank 53 and reclaimed water W2 stored in a second tank 63. The pressurized water supply unit 50 pressurizes the water W1 and 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 Regeneration Device 60> In this embodiment, the water recovery and regeneration device 60 separates the water from the crushed coating layer by passing the water sprayed from the first spray unit 31 and the second spray unit 32 through filtration filters 601, 602. The water recovery and regeneration device 60 includes a second tank 63 that stores the separated water as reclaimed water W2, a first filtration filter 601 and a first recovery pump 61 that are disposed between the second tank 63 and the first spray chamber 301, and a second filtration filter 602 and a second recovery pump 62 that are disposed between the second tank 63 and the second spray chamber 302. The second tank 63 is connected to the two supply pumps 51, 52 of the pressurized water supply unit 50 via pipes 631, 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 from 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 laminate film 90. The residue removal device 70 is not particularly limited, and examples thereof include a draining nozzle (also referred to as an air knife) and a dryer. The residue removal device 70 only needs to be disposed on at least the side of the crushed coating layer 92. In the case of FIG. 1A , the residue removal device 70 is a pair of draining nozzles.

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

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

[0031] <Roll Take-up Shaft 40> The roll take-up shaft 40 takes up the substrate film 91 into 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 Apparatus A coating layer removal apparatus 100A according to a second embodiment will be described. In the second embodiment, differences from the first embodiment will be mainly described, and descriptions of similar elements will be omitted or simplified by using the same reference numerals, for example. FIG. 3 is a schematic diagram of the coating layer removal apparatus 100A according to the second embodiment. The removal apparatus 100A according to the second embodiment is similar to the first embodiment except that, in the removal apparatus 100 described in the first embodiment, both the first spray unit 31 and the second spray unit 32 are positioned to face the first backup roll 21. Therefore, the removal apparatus 100A does not include the second backup roll 22, the second filtration filter 602, the second recovery pump 62, or the like.

[0033] <First spray 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 the 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. 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 (e.g., 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 (e.g., 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 spray unit 31 and the second spray unit 32 can be, for example, the nozzle arrangement (staggered arrangement) shown in Figure 1D. When different spray 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 spray units (in the case of Figure 1D, the first spray unit 31 and the second spray unit 32) 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 trajectories drawn by the intersection of the central axis of the nozzle and the surface of the laminated film. In Figure 1D, the distance between the two trajectories is indicated by the distance P1 between the Y coordinates.

[0035] <Water Recovery and Regeneration 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. Furthermore, 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 Apparatus] A coating layer removal apparatus 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 assigning the same reference numerals, for example. Figure 4 is a schematic diagram of the coating layer removal apparatus 100B according to the third embodiment. The removal apparatus 100B according to the third embodiment differs from the removal apparatus 100A described in the second embodiment in the positions of the first ejection unit 31 and the second ejection unit 32. In other respects, the configuration is similar to that of the second embodiment.

[0038] <First spray 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 the 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 may 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 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 spraying units 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 along 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 more likely to peel off as the laminated film 90 passes through the spraying units 31 and 32, it is possible to recover the substrate film 91 without using the residue removal device 70. Alternatively, a removal device with a simpler mechanism may be used.

[0041] [Fourth embodiment] [Method of removing a coating layer] A method of removing a coating layer according to a fourth embodiment includes the steps of: unwinding a laminate film having a base film and a coating layer from a roll around which the laminate film is wound; a first spraying step of spraying pressurized water toward a first spray area of ​​the coating layer as the unwound laminate film passes over at least one backup roll, thereby crushing the coating layer; a second spraying step of spraying pressurized water toward a second spray area of ​​the coating layer, which includes at least an area other than the first spray area, as the unwound laminate film passes over the at least one backup roll after the first spraying step, thereby crushing the coating layer in the second spray 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 implemented, for example, using the removal devices according to the first to third embodiments. In the following description, the removal method according to the fourth embodiment will be described with reference to the case where the removal method is implemented using the removal device 100 ( FIG. 1A ) according to the first embodiment.

[0043] In the removal method according to the fourth embodiment, pressurized water W3 is sprayed sequentially from the first spraying unit 31 and the second spraying unit 32 toward the coating layer 92 as the laminated film 90 passes through the first backup roll 21 and the second backup roll 22. Thus, according to the removal method according to the fourth embodiment, a large amount of laminated film can be continuously processed using a roll-to-roll method, as in the first embodiment. Furthermore, according to the removal method according to this embodiment, the coating layer can be removed using essentially only water without using chemicals, allowing for stable processing of the laminated film. Furthermore, according to the removal method according to 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 further reduces the impact on the global environment.

[0044] <Water Used in 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 in 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 recycled, it may be recycled as appropriate. The water used in the pressurized water may contain additives that impart functionality, 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 an additive, the concentration of the active ingredient of the additive in the water is preferably 0.2% by mass or less, more preferably 0.1% by mass or less, relative to the total amount of water. Furthermore, it is preferable that the water used for the pressurized water is not water to which an additive has been intentionally added. Furthermore, it is preferable that the water used for the pressurized water is not an alkaline aqueous solution prepared by intentionally adding a basic substance, and it is also preferable that the water used for the pressurized water is not an acidic aqueous solution prepared by intentionally adding an acidic substance. Since wastewater may be recycled simply, the water used for the pressurized water may contain a basic substance and an acidic substance 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] <Unwinding Step> The unwinding step is a step of unwinding a laminate film having a base film and a coating layer from a roll around which the laminate film is wound. As the laminate film, for example, a laminate film 90 shown in Fig. 2 can be used. The laminate film 90 may be a laminate 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 spraying step, pressurized water is sprayed toward a first spray area of ​​the coating layer as the unwound laminate film passes through at least one backup roll to fracture the coating layer. In the second spraying step, pressurized water is sprayed toward a second spray area of ​​the coating layer, including at least an area other than the first spray area, as the unwound laminate film passes through at least one backup roll after the first spraying step to fracture the coating layer in the second spray area not fractured in the first spraying step. Preferably, the first spraying step is a step of spraying pressurized water from a first spray 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 spray unit including one or more nozzles arranged opposite the at least one backup roll. In the case of Figures 1A, 1B, and 1C, in the first spraying step, pressurized water W3 is sprayed from a first spray unit 31 including five nozzles arranged opposite the first backup roll 21. The first spraying step is carried out 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. The second spraying step involves spraying pressurized water W3 from a second spraying unit 32 including four nozzles arranged opposite the second backup roll 22. The second spraying step is carried out with the second backup roll 22 in contact with the surface of the base film 91 opposite the coating layer 92 of the laminate 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 Step> The rinsing step is a step of rinsing the broken coating layer together with the pressurized water W3 sprayed toward the first and second spraying areas. The rinsing step is a step of rinsing at least a portion of the broken coating layer. In the case of Fig. 1A, in the rinsing step, the broken coating layer 92 is washed away together with the pressurized water W3 by the spraying of the pressurized water W3 from the first spraying unit 31, and then the broken coating layer 92 is washed away together with the pressurized water W3 by the spraying of the pressurized water W3 from the second spraying unit 32. The washed-away coating layer 92 is discharged from the outlets 1a and 2a of the spraying 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 Step> In the fourth embodiment, it is preferable to include a coating layer removal step of removing coating layer residue after the washing step and before the winding step. The coating layer removal step is a step of removing coating layer residue that was not washed away in the washing step. Examples of the step of removing coating layer residue include a step of blowing off the coating layer 92 remaining on the substrate film 91 in a crushed state, and a step of drying water adhering to the substrate film 91. In the case of FIG. 1A , the coating layer removal step involves blowing air from a pair of water-removing nozzles (an example of a residue removal device 70) onto both sides of the laminated film 90 discharged from the second spray chamber 302 to blow off the crushed coating layer, thereby removing the coating layer residue.

[0051] <Recovery Step, Reuse Step> The removal method according to the fourth embodiment preferably includes a step of recovering the water used in the first and second spraying steps, and a step of reusing at least a portion of the recovered water in the first and second spraying steps. In the case of FIG. 1A , the water sprayed from the first and second spraying units 31 and 32 is discharged from outlets 1 a and 2 a of the spray chambers 301 and 302, respectively, and filtered and regenerated by filters 601 and 602. The filtered water (regenerated water W2) is supplied to a second tank 63 by 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 reused in the first and second spraying steps (reuse step).

[0052] <Winding Step> 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 Figures 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 Figure 1A.

[0054] An example of an injection unit having five injection units will be described using Fig. 5. Fig. 5 shows each nozzle and laminate film when viewed from the base end of the nozzle toward the nozzle tip (injection port). A first injection unit 31, a second injection unit 32, a third injection unit 33, a fourth injection unit 34, and a fifth injection unit 35 are arranged in this order from the upstream side in the conveyance direction (+X-axis direction) of the laminate 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 the 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 the 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 the 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 the 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 laminate film. The nozzles are then staggered in an inverted V-shape from the center to the fifth spray unit 35, expanding toward both ends of the width of the laminate film 90 (in the -Y and -axis directions). This achieves the following benefits: In the spray units (in Figure 5, the second spray unit 32 to the fifth spray unit 35) other than the first spray unit 31, when the pressurized water hits the coating layer 92, the coating layer 92 is already fractured in the spray area downstream of the first spray unit. This makes it easier for the spray unit to fracture the coating layer 92 starting from this fractured point. This allows the pressure of the pressurized water to be reduced except for the first spray unit 31, potentially saving energy. Furthermore, by arranging the spray units as shown in Figure 5, the crushed coating layer can be naturally washed away toward both ends of the width of the laminate film 90, 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 spray 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, the coating layer is removed using a removal device ( FIGS. 1A , 3 , and 4 ) including both the roll payout shaft 10 and the roll take-up shaft 40. However, instead of the removal device, an apparatus system may be used in which an apparatus for performing 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, the apparatus for performing a pre-process will be referred to as the “pre-processing apparatus,” and the removal device according to the above-described embodiment will be referred to as the “removal device,” and a specific example of the apparatus system will be described. When the removal method according to the above-described embodiment is applied, the removal method according to the above-described embodiment may be applied to a combination of an apparatus in which the pre-processing apparatus includes (a) a roll feed shaft for the pre-processing apparatus and (b) a roll take-up shaft for the pre-processing apparatus, and the removal device includes (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 composite device in which the (b) roll winding shaft and the (c) roll feeding shaft are omitted and the front-end process device and the removal device are connected. In this modified example, the process of unwinding the laminated film is performed by the (a) roll feeding shaft of the front-end process device. By using such an apparatus system (composite device) to carry out the removal method according to the above-described embodiment, the multilayer ceramic capacitor (MLCC) manufacturing process and the coating layer removal process can be carried out seamlessly using a roll-to-roll method, thereby significantly reducing 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] [Laminate Film] The laminate film used in the above-described embodiment has a substrate film and a coating layer. The coating layer may be a single layer, or may be 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. 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] <Substrate Film> The substrate film is a resin film formed from a resin component to be recycled. Examples of resin films that can be used 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; and cellophane. Among the substrate films, polyester film is preferred due to its excellent heat resistance and strength. As the polyester film, a polyester film containing polyethylene terephthalate, polybutylene terephthalate, or polyethylene naphthalate as the main component is preferred from the viewpoint of easy resin recovery and recycling. In this specification, the term "main component" or "principal component" means that the proportion of 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 previously 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. For example, a release agent composition containing as its main component a silicone-based compound; a fluorine compound; a long-chain alkyl group-containing compound; or a thermoplastic resin material such as an olefin-based resin or a diene-based resin can be used. It is also preferable to use a release agent composition containing as its 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, examples of the silicone compound include silicone compounds 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, examples of the fluorine compound include fluorine silicone compounds, fluorine boron compounds, and poly(perfluoroalkylene ether) chain-containing compounds.

[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 is modified with a long-chain fatty acid as a modifier.

[0068] As a release agent composition mainly composed of an energy ray-curable resin, for example, 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 is preferred. In the 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, so that before curing, components derived from the polyorganosiloxane are segregated near the outer surface of the release agent layer, and then cured by energy rays, and the segregation is fixed. This improves the releasability of the release agent layer. The release agent composition mainly composed of an energy ray-curable resin 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 components described above, such as antioxidants, light stabilizers, flame retardants, conductive agents, antistatic agents, and plasticizers.

[0071] The thickness of the coating layer can be appropriately selected 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.

[0073] 10...roll payout 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...substrate 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, 31a to 31e, 32a to 32d, 33a to 33b, 34a to 34b, 35a to 35b...nozzle.

Claims

1. A coating layer removal device for removing a coating layer from a laminated film having a base film and a coating layer, comprising: a roll payout shaft that pays out the laminated film; a first backup roll that is located downstream of the roll payout shaft and abuts against the base film of the laminated film and transports the laminated film downstream; a first spray unit that includes one or more nozzles and is located opposite the first backup roll; a second spray unit that is located downstream of the first spray unit and includes one or more nozzles and is located 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 winds up the base film into a roll after the coating layer has been removed, 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.

2. The coating layer removal device according to claim 1, wherein, when viewed in the transport direction of the laminated film, the one or more nozzles of the first spray unit and the one or more nozzles of the second spray unit 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.

3. A coating layer removal device as described in claim 1 or claim 2, wherein 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 the transport direction of the laminated film.

4. A coating layer removal device as described in claim 1 or claim 2, wherein the second spray unit is positioned so that pressurized water hits areas of the laminated film that were not hit by the pressurized water sprayed from the first spray unit.

5. A coating layer removal device as described in claim 1 or claim 2, comprising a water recovery and recycling device that recovers and recycles the water sprayed from the first spray section and the second spray section, the water recovery and recycling device being connected to the pressurized water supply section.

6. A coating layer removal device according to claim 1 or claim 2, further comprising a residue detection device that detects the presence of the coating layer remaining, the residue detection device being positioned downstream of the second backup roll and upstream of the roll winding shaft.

7. The coating layer removal device according to claim 1 or claim 2, further comprising a residue removal device that removes residue from the coating layer, the residue removal device being positioned downstream of the second backup roll and upstream of the roll winding shaft.

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 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.

9. A method for removing a coating layer as described in claim 8, wherein 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, and when viewed in a cross section of the at least one backup roll in a direction perpendicular to the central axis of the 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 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 that supports the laminated film.

10. The method for removing a coating layer according to claim 8 or claim 9, further comprising a coating layer removing step of removing residues of the coating layer after the washing step and before the winding step.

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

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