Removal device

Abstract

To provide a removal device capable of efficiently removing a functional layer from a film.SOLUTION: The removal device includes a first roller, a second roller, and a first removal unit that is disposed in the vicinity of the film that is wound between the first roller and the second roller and conveyed, and removes the functional layer from the film. The axis of the first roller and the axis of the second roller extend non-parallel to each other so that the film is repeatedly wound between the first roller and the second roller. The film repeatedly passes through the first removal unit while being transported so as to be repeatedly wound between the first roller and the second roller.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a removal device for removing a functional layer from a film, a method for producing a treated film using the same, a method for producing a recycled resin raw material, and a method for producing a recycled film. [Background technology]

[0002] Patent Document 1 discloses a recycling technology for heat-shrinkable films, in which heat-shrinkable films are produced using fluff and repellets obtained from packaging materials having a printed layer as starting materials. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6849141 Summary of the Invention [Problem to be solved by the invention]

[0004] In many film products, various functional layers, such as a printed layer, a matte layer, a protective layer, a slippery layer, a barrier layer, a light-shielding layer, an ultraviolet absorbing layer, a metal film, an easy-adhesion layer, a release layer, an antistatic layer, and a conductive layer, are laminated on a resin film body. When recycled films are produced using such waste film materials, various components contained in the functional layers may degrade the quality of the recycled film. For example, colorants contained in the printed layer may reduce the transparency of the recycled film. Therefore, when recycling waste film materials, it may be important to remove the functional layers from the waste film materials beforehand.

[0005] An object of the present invention is to provide a removal device capable of efficiently removing a functional layer from a film, as well as a method for manufacturing a treated film using the same, a method for manufacturing a recycled resin raw material, and a method for manufacturing a recycled film. [Means for solving the problem]

[0006] Item 1. A removal device for removing a functional layer from a film including the functional layer, The first roller, The second roller, a first removal unit that is disposed near the film that is wound between the first roller and the second roller and transported, and that removes the functional layer from the film; Equipped with an axis of the first roller and an axis of the second roller extend non-parallel to each other so that the film is repeatedly wound between the first roller and the second roller; the film repeatedly passes through the first removal section while being transported while being repeatedly wrapped between the first roller and the second roller; removal device.

[0007] Item 2. Third roller; The fourth roller, a second removal unit that is disposed near the film that is wound between the third roller and the fourth roller and transported, and that further removes the functional layer from the film; Furthermore, the third roller and the fourth roller are disposed downstream of the first roller and the second roller, an axis of the third roller and an axis of the fourth roller extend non-parallel to each other so that the film is repeatedly wound between the third roller and the fourth roller; the film repeatedly passes through the second removal section while being transported while being repeatedly wound between the third roller and the fourth roller; Item 1. The removal device according to item 1.

[0008] Item 3. The direction in which the film rotates between the first roller and the second roller is opposite to the direction in which the film rotates between the third roller and the fourth roller. Item 2. The removal device according to item 2.

[0009] Item 4. Using the removal device according to any one of items 1 to 3, a treated film is produced by removing the functional layer from the film. A method for producing a processed film, comprising:

[0010] Item 5. Produce recycled resin raw materials using the treated film produced by the manufacturing method described in Item 4 as a starting material. A method for producing recycled resin raw materials, comprising:

[0011] Item 6. Produce a recycled film using the recycled resin raw material produced by the production method according to item 5 as at least a part of the raw material. A method for producing a recycled film, comprising: [Effects of the Invention]

[0012] According to the present invention, there are provided a removal device capable of efficiently removing a functional layer from a film, as well as a method for producing a treated film using the same, a method for producing a recycled resin raw material, and a method for producing a recycled film. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a block diagram illustrating a resource circulation system according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a waste film according to an embodiment. [Figure 3] FIG. 2 is a plan view of a product film before film selvages are cut out according to one embodiment. [Figure 4] FIG. 2 is a plan view of a removal device according to one embodiment. [Figure 5] FIG. 5 is a front view of the removal device of FIG. 4. [Figure 6] FIG. 10 is a front view of a removal device according to a modified example. [Figure 7] FIG. 10 is a front view of a removal device according to another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and their description will not be repeated. The drawings are also drawn in a schematic manner, with objects appropriately omitted or exaggerated, for ease of understanding.

[0015] [1. Structure of the resource circulation system] In recent years, marine pollution caused by discarded plastics has become a global problem. Resource recycling has attracted attention as a means of addressing such problems. FIG. 1 is a diagram schematically illustrating a resource recycling system S1 that uses a method for manufacturing a recycled film 4 according to this embodiment. As shown in FIG. 1, in the resource recycling system S1, waste film (hereinafter referred to as "waste film") 1 is recycled to produce new film (hereinafter referred to as "recycled film") 4. The waste film 1 and recycled film 4 are packaging materials such as heat-shrinkable films or labels that can be used in various fields, such as food, beverages, pharmaceuticals, medical supplies, chemicals, cosmetics, toiletries, industrial products, and agricultural products.

[0016] FIG. 2 is a cross-sectional view of a waste material film 1 according to this embodiment. The waste material film 1 has a resin film body 11 and functional layers 12 and 13 laminated on both sides of the film body 11. The film body 11 is a transparent or translucent heat-shrinkable film, although not limited thereto. The functional layers 12 and 13 are, for example, a printing layer, a matte layer, a protective layer (e.g., an overcoat layer, a hard coat layer, etc.), a slippery layer (e.g., an inner coat layer, an anti-blocking layer, etc.), a barrier layer, a light-shielding layer, an ultraviolet absorbing layer, a metal film, an easy-adhesion layer, a release layer, an antistatic layer, a conductive layer, etc. Of these, the printing layer is a layer for applying a design to the film body 11 and contains a coloring component (colorant) such as ink. The design may be, for example, a pattern, letters, symbols (e.g., a barcode), or a combination thereof. The printing layer may be formed, for example, by using a gravure printing plate.

[0017] The thickness of the film body 11 is not particularly limited and can be appropriately selected depending on the application, etc., but is preferably 10 μm or more, more preferably 12 μm or more, and even more preferably 15 μm or more. When the thickness of the film body 11 is within this range, excellent heat shrinkability, printability, converting properties such as center sealing, and excellent wearability can be obtained. Furthermore, the thickness of the film body 11 is preferably 60 μm or less, more preferably 50 μm or less, and even more preferably 40 μm or less. When the thickness of the film body 11 is within this range, long winding is possible, improving productivity. The film body 11 may be a single layer or a multilayer. The film body 11 may contain a layer containing a mixture of different types of resins. The film body 11 may also contain multiple layers, each containing a different type of resin. Each layer constituting the film body 11 may contain components other than resin. Each layer constituting the film body 11 may contain a metal component such as aluminum, an antiblocking agent, an additive, etc. Examples of the additives include heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, lubricants, antistatic agents, flame retardants, antibacterial agents, and fluorescent whitening agents.

[0018] Examples of resins contained in the film body 11 include polyolefin-based resins, polystyrene-based resins, polyamide-based resins, and polyester-based resins. Examples of polyolefin-based resins include polypropylene-based, polyethylene-based, and cyclic polyolefin-based resins. Examples of polystyrene-based resins include styrene homopolymers, styrene-butadiene copolymers, styrene-isoprene copolymers, styrene-isoprene-butadiene copolymers, styrene-acrylic copolymers, acrylonitrile-butadiene-styrene copolymers, and acrylonitrile-styrene copolymers. Examples of polyamide-based resins include aliphatic polyamides such as nylon 6-based resins, nylon 66-based resins, and nylon 12-based resins, aromatic polyamides, amorphous polyamides, and polyamide elastomers. Examples of polyester-based resins include those obtained by condensation polymerization of a dicarboxylic acid component and a diol component. The type of the dicarboxylic acid component is not particularly limited, and examples include terephthalic acid, o-phthalic acid, isophthalic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, octylsuccinic acid, cyclohexanedicarboxylic acid, naphthalenedicarboxylic acid, fumaric acid, maleic acid, itaconic acid, decamethylenecarboxylic acid, anhydrides thereof, and lower alkyl esters thereof.The type of the diol component is not particularly limited, and examples thereof include ethylene glycol, 1,3-propanediol, 1,4-butanediol, diethylene glycol, 1,5-pentanediol, 1,6-hexanediol, dipropylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3-butanediol, 2,3-butanediol, neopentyl glycol (2,2-dimethylpropane-1,3-diol), 1,2-hexanediol, 2,5- Examples include aliphatic diols such as hexanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, and polytetramethylene ether glycol; and alicyclic diols such as 2,2-bis(4-hydroxycyclohexyl)propane, alkylene oxide adducts of 2,2-bis(4-hydroxycyclohexyl)propane, 1,4-cyclohexanediol, and 1,4-cyclohexanedimethanol.

[0019] The thickness of each of the functional layers 12 and 13 is not particularly limited and can be appropriately selected depending on the application, etc., but is preferably 0.1 μm to 5.0 μm, more preferably 0.3 μm to 4.0 μm, and even more preferably 0.5 μm to 3.0 μm. The functional layers 12 and 13 may each be a single layer or multiple layers. The functional layers 12 and 13 may be the same type of layer or different types of layers. For example, the functional layer 12 may be composed of a printed layer laminated on the back surface of the film body 11 and an inner coat layer laminated on the printed layer, and the functional layer 13 may be composed of an overcoat layer laminated on the front surface of the film body 11. Note that the back surface here refers to the inner surface facing the target product when the target product is packaged with the film, and the front surface refers to the outer surface on the opposite side. The inner coat layer is formed, for example, to improve slippage between the target product and a labeling device that attaches the film to the target product as a label. The overcoat layer is formed, for example, for the purpose of reducing scratches on the outer surface of the label attached to the target product. Each of the inner coat layer and the overcoat layer is formed, for example, during a pattern printing process. In the description of this embodiment, an example is shown in which functional layers are laminated on both the front and back surfaces of the film body 11, but a functional layer may be laminated on only one surface of the film body 11. In other words, one of the functional layers 12 and 13 may be omitted.

[0020] The waste film 1 is a narrow, long film. Although not limited thereto, the width of the waste film 1 is typically about several mm to several cm. The waste film 1 is preferably 1.0 mm or more, more preferably 2.0 mm or more, and even more preferably 3.0 mm or more. The waste film 1 is preferably 80 mm or less, more preferably 50 mm or less, and even more preferably 30 mm or less. In the description of this embodiment, the following film selvage is exemplified as such a waste film 1. Hereinafter, the film selvage will also be given the symbol 1.

[0021] The film edge 1 is cut from a wide, long product film 5 shown in FIG. 3. As shown in FIG. 3, the product film 5 includes a product portion 50 and film edge portions 1, 1 adjacent to both ends of the product portion 50 in the width direction. While FIG. 3 shows the product film 5 in an unfolded state, the product film 5 is actually wound up and managed in the form of a roll for storage and handling. The product portion 50 is used to package various containers, such as plastic containers, glass containers, and paper containers. Before shipping the product portion 50, the film edge portions 1, 1 are separated from the product portion 50 by cutting the product film 5 along the boundary between the product portion 50 and the film edge portions 1, 1. The product portion 50 and the film edge portions 1, 1 are also each wound up and managed in the form of a roll for storage and handling.

[0022] The product section 50 has the same layer structure as the film edge 1 (waste film 1). That is, the product section 50 also has a resin film body 11 and functional layers 12, 13 laminated on the film body 11. The product section 50 includes, for example, a printed layer on which information about the target product to be packaged by the product section 50 is printed. The film edge 1 includes, for example, a printed layer on which information for checking the printing status of the product section 50 is printed.

[0023] Although not limited thereto, in this embodiment, the product film 5 and the film edge 1 cut out therefrom are heat-shrinkable films in a state before heat shrinkage. The product film 5 and the film edge 1 may be uniaxially stretched films that heat shrink primarily in the lateral direction (width direction), for example, so that the product portion 50 can be used as a tubular label. The heat shrinkage rate of the product film 5 and the film edge 1 in the main shrinkage direction is appropriately selected taking into consideration the ease of attachment to a container or the like when the product portion 50 is used as a label, and is preferably 30% or more, and more preferably 50% or more, when immersed in 90°C hot water for 10 seconds.

[0024] The history of the waste film 1 is not particularly limited, and it does not have to be waste material such as the above-mentioned film selvage 1. The waste film 1 can be, for example, lead film used for printing registration (pattern alignment), unused product parts 50, intermediate processed products, leftover products, defective products, prototypes, discarded products, etc. When a wide film such as a lead film or a product part 50 is used as the waste film 1, it is preferable that such a wide film be appropriately cut into a narrow film such as the film selvage 1 before being supplied to the removal device 10.

[0025] Referring again to FIG. 1, the resource circulation system S1 includes a removal device 10 according to this embodiment, a manufacturing device 20 for recycled resin raw material 3, and a film manufacturing device 30. The removal device 10 is a device that physically removes functional layers 12, 13 from waste film 1. In the resource circulation system S1, the removal device 10 is used to manufacture a film (hereinafter referred to as a processed film) 2 in which the functional layers 12, 13 have been removed from the waste film 1. The processed film 2 typically does not have the functional layers 12, 13 and is composed only of a film body 11, although some of the functional layers 12, 13 may remain. The processed film 2 is typically a narrow, long film, like the waste film 1.

[0026] In the resource circulation system S1, a manufacturing apparatus 20 is used to further produce recycled resin raw material 3 from the processed film 2. The manufacturing apparatus 20 is an apparatus for producing recycled resin raw material 3 using the processed film 2 produced using the removal apparatus 10 as a starting material. The recycled resin raw material 3 is a resin raw material obtained by processing the processed film 2 into a shape that is easy to handle when producing recycled film 4 from the processed film 2. Specifically, the recycled resin raw material 3 can be in the form of fluff 3a, pellets 3b, powder 3c, granulated material 3d, or the like. Granulated material 3d is not formed by heating and melting a raw material and then solidifying it, as in pellets 3b, but is a mass formed by compressing and solidifying a powdered raw material without heating and melting it. Granulated material 3d is typically an opaque mass. Note that recycled resin raw material 3 in the form of fluff 3a, powder 3c, or granulated material 3d is less susceptible to thermal degradation than recycled resin raw material 3 in the form of pellets 3b because it has not undergone excessive thermal history, such as heating and melting, during processing.

[0027] The processed film 2 can be processed into fluff 3a by, for example, appropriately using a known crusher, shredder, cutter, etc., to shred the processed film 2. The size (area) of the fluff 3a is 500 mm 2 Less than 300mm is preferable 2 Less than 200mm is preferable 2 Less than 100mm is more preferable 2 The following are particularly preferred:

[0028] The processed film 2 can be processed into pellets 3b using, for example, a known resin pellet manufacturing machine. For example, fluff 3a is supplied to an extruder, heated and melted in the extruder, extruded through a die, and the extruded material is cut into an appropriate shape to produce pellets 3b. Note that pellets 3b may be produced using not only the processed film 2 (fluff 3a) but also virgin resin raw material. In this case, virgin resin raw material is supplied to the extruder in addition to fluff 3a.

[0029] The processed film 2 can be processed into powder 3c, for example, by the following method. First, fluff 3a is immersed in an appropriate solvent, and the resin component contained in fluff 3a is dissolved in the solvent to produce a solution containing the resin component. Then, the resin component is precipitated by cooling the solution, mixing a poor solvent into the solution, and / or heating the solution to evaporate the solvent. Thereafter, the precipitate of the resin component is dried to produce powder 3c.

[0030] The processed film 2 can be processed into granules 3d, for example, by drying the above-mentioned resin component precipitate while stirring it under vacuum. Alternatively, the granules 3d can be produced using a known granulator. In this case, the above-mentioned resin component precipitate or powder 3c can be introduced into the granulator. In this case, it is preferable to dry the resin component precipitate or powder 3c before or during granulation, or to dry the granules 3d after granulation.

[0031] In the resource circulation system S1, a film manufacturing apparatus 30 is used to further produce a recycled film 4 from the recycled resin raw material 3. The film manufacturing apparatus 30 is an apparatus that produces the recycled film 4 using the recycled resin raw material 3 produced using the manufacturing apparatus 20. A known film-forming method can be used to process the recycled film 4. For example, the recycled resin raw material 3 may be supplied to an extruder, heated and melted in the extruder, and then extruded through a die for extrusion molding. In this case, a laminated film can be produced by co-extrusion. After molding, the recycled film 4 is appropriately stretched to impart heat shrinkability and processed into a heat-shrinkable film. In addition, functional layers such as functional layers 12 and 13 may be appropriately laminated on the recycled film 4.

[0032] The recycled film 4 may be produced using not only the recycled resin raw material 3 but also virgin resin raw material. In this case, the extruder is supplied with both the recycled resin raw material 3 and the virgin resin raw material. The recycled film 4 may be constructed similarly to the film body 11 included in the product film 5 in terms of material, layer structure, thickness, etc. Therefore, the above description of the film body 11 also applies to the recycled film 4. The recycled film 4 may be single-layer or multi-layer. When the recycled film 4 is multi-layer, at least one layer included in the recycled film 4 may be made of recycled resin raw material 3, and at least one other layer may be made of only virgin resin raw material out of virgin resin raw material and recycled resin raw material 3. For example, if the recycled film 4 includes an intermediate layer and adjacent layers disposed on both sides of the intermediate layer, the intermediate layer may be made of a mixture of recycled resin raw material 3 and virgin resin raw material, and the adjacent layers may be made of only virgin resin raw material out of virgin resin raw material and recycled resin raw material 3.

[0033] [2. Configuration of removal device] Figure 4 shows a plan view of the removal device 10, and Figure 5 shows a front view of the removal device 10. In this description, up and down, front and back (front and back), and left and right are defined as shown in Figures 4 and 5 unless otherwise specified.

[0034] The removal device 10 produces a treated film 2 by physically removing the functional layers 12, 13 from the waste film 1 while transporting the waste film 1 unwound from the roll. As shown in Figures 4 and 5, the removal device 10 has a pair of rollers 21, 22. The waste film 1 unwound from the roll is wound between the rollers 21, 22 and transported along the rollers 21, 22. In this embodiment, the roller 21 (hereinafter sometimes referred to as the first roller 21) is positioned upstream of the roller 22 (hereinafter sometimes referred to as the second roller 22) in the transport direction of the waste film 1. Preferably, of the rollers 21, 22, the roller 21 can be a drive roller, and the roller 22 can be a drive roller or a driven roller.

[0035] The second roller 22 is a roller known as a Nelson roller, and is positioned so that its axis A2 is inclined relative to the axis A1 of the first roller 21. The angle of the axis A2 relative to the axis A1 can be appropriately set within a range such that the waste films 1 wound around the rollers 21 and 22 do not overlap. The removal device 10 further includes a support base 40 and a rear wall portion 41 standing upright on the rear side of the support base 40. The rear wall portion 41 has two surfaces 411 and 412 on its front side that are aligned in the left-right direction and perpendicular to the horizontal plane. The two surfaces 411 and 412 form a step in the front-rear direction, with the right surface 412 being positioned further forward than the left surface 411. The first roller 21 is rotatably fixed to the left surface 411 so that the axis A1 of the first roller 21 is perpendicular to the left surface 411. On the other hand, the second roller 22 is rotatably fixed to the left surface 411 so that the axis A2 of the second roller 22 is inclined with respect to the normal direction of the left surface 411. More specifically, the axis A2 of the second roller 22 is inclined with respect to the axis A1 of the first roller 21 as it moves away from the left surface 411 toward the front. In other words, the distance between the axis A1 and the axis A2 becomes narrower as it moves forward from the left surface 411.

[0036] As described above, the axis A1 of the first roller 21 and the axis A2 of the second roller 22 extend non-parallel to each other. As a result, the waste film 1 is repeatedly wound between the first roller 21 and the second roller 22. More specifically, after being unwound from the roll, the waste film 1 is first wound around the first roller 21, then wound around the second roller 22, and then wound around the first roller 21 again, and then wound around the second roller 22 again. This same winding is repeated a predetermined number of times. In other words, the waste film 1 is alternately wound around the rollers 21 and 22 multiple times. Furthermore, as the waste film 1 passes through the rollers 21 and 22 multiple times, it gradually moves forward along the axes A1 and A2 (in the direction in which the distance between the axes A1 and A2 narrows). As a result, the waste film 1 is conveyed while gradually shifting in a direction (the direction of axes A1 and A2) substantially perpendicular to the conveying direction, and follows a spiral trajectory. Therefore, the waste film 1 does not overlap on the conveying path while repeatedly circling around the rollers 21 and 22.

[0037] The removal device 10 further includes a first removal unit 31. The first removal unit 31, together with the first roller 21 and the second roller 22, constitutes a first removal mechanism M1. The first removal unit 31 is arranged near the waste film 1 that is wound around and transported between the first roller 21 and the second roller 22, and physically removes the functional layer 12 from the waste film 1. In this embodiment, the first removal unit 31 includes a blade 311. In the example of FIGS. 4 and 5, the blade 311 is arranged below the first roller 21 and the second roller 22, and between the first roller 21 and the second roller 22 in the left-right direction. The blade 311 is arranged so that its cutting edge comes into contact with one side of the waste film 1 that is wound around and transported between the first roller 21 and the second roller 22 (in the description of this embodiment, the side on which the functional layer 12 is present). This allows the blade 311 to scrape off the functional layer 12 from the waste film 1.

[0038] The blade 311 extends generally parallel to the axes A1 and A2 and occupies generally the same position as the rollers 21 and 22 in the width direction of the rollers 21 and 22. Therefore, the waste film 1 passes repeatedly through the blade 311 while being transported while being repeatedly wound between the first roller 21 and the second roller 22. In other words, the cutting edge of the blade 311 repeatedly comes into contact with the waste film 1 that is repeatedly wound around the rollers 21 and 22 with a slight gap in the width direction of the rollers 21 and 22. As a result, one side of the waste film 1 can be scraped repeatedly by the blade 311 while the first removal mechanism M1 has a compact configuration. Therefore, the functional layer 12 is efficiently removed from the waste film 1.

[0039] The first removal section 31 further includes an air cylinder 312. The air cylinder 312 applies pressure to the blade 311 so as to press it against the waste film 1. This allows the cutting edge of the blade 311 to firmly contact the waste film 1 during transport with a certain level of pressure or more, enabling the functional layer 12 to be removed from the waste film 1 more efficiently.

[0040] The removal device 10 further includes another pair of rollers 23, 24 arranged downstream of the rollers 21, 22. The waste film 1 that finally passes through the rollers 21, 22 is then wound between the rollers 23, 24 and transported along the rollers 23, 24. In this embodiment, the roller 23 (hereinafter sometimes referred to as the third roller 23) is arranged upstream of the roller 24 (hereinafter sometimes referred to as the fourth roller 24) in the transport direction of the waste film 1. Preferably, of the rollers 23, 24, the roller 23 can be a drive roller, and the roller 24 can be a drive roller or a driven roller.

[0041] Like the second roller 22, the fourth roller 24 is also a Nelson roller, and is disposed so that its axis A4 is inclined relative to the axis A3 of the third roller 23. The swing angle of the axis A4 relative to the axis A3 can be appropriately set within a range in which the waste films 1 wound around the rollers 23, 24 do not overlap. The third roller 23 is rotatably fixed to the right surface 412 of the rear wall portion 41 so that the axis A3 of the third roller 23 is perpendicular to the right surface 412. Meanwhile, the fourth roller 24 is rotatably fixed to the right surface 412 so that the axis A4 of the fourth roller 24 is inclined relative to the normal direction of the right surface 412. More specifically, the axis A4 of the fourth roller 24 is inclined relative to the axis A3 so that it approaches the axis A3 of the third roller 23 as it moves forward away from the right surface 412. In other words, the distance between the axis A3 and the axis A4 becomes narrower from the right surface 412 toward the front.

[0042] As described above, the axis A3 of the third roller 23 and the axis A4 of the fourth roller 24 extend non-parallel to each other. As a result, the waste film 1 is repeatedly wound between the third roller 23 and the fourth roller 24. More specifically, after the waste film 1 finally passes through the rollers 21 and 22, it is first wound around the third roller 23, then around the fourth roller 24, and then again around the third roller 23, and then again around the fourth roller 24. This same winding is repeated a predetermined number of times. That is, the waste film 1 is alternately wound around the rollers 23 and 24 multiple times. Furthermore, while the waste film 1 passes through the rollers 23 and 24 multiple times, it gradually moves forward along the axes A3 and A4 (in the direction in which the distance between the axes A3 and A4 narrows). As a result, the waste film 1 is conveyed while gradually shifting in a direction (the direction of axes A3 and A4) substantially perpendicular to the conveying direction, and follows a spiral trajectory. Therefore, the waste film 1 does not overlap on the conveying path while repeatedly circling around the rollers 23 and 24.

[0043] The removal device 10 further includes a second removal unit 32. The second removal unit 32, together with the third roller 23 and the fourth roller 24, constitutes a second removal mechanism M2. The second removal unit 32 is disposed near the waste film 1 that is wound around and transported between the third roller 23 and the fourth roller 24, and physically removes the functional layer 13 from the waste film 1. In this embodiment, the second removal unit 32 includes a blade 321. In the example of FIGS. 4 and 5, the blade 321 is disposed below the third roller 23 and the fourth roller 24, and between the third roller 23 and the fourth roller 24 in the left-right direction. The blade 321 is disposed so that its cutting edge comes into contact with one side of the waste film 1 that is wound around and transported between the third roller 23 and the fourth roller 24 (in the description of this embodiment, the side on which the functional layer 13 is present). This allows the blade 321 to scrape off the functional layer 13 from the waste film 1.

[0044] The blade 321 extends generally parallel to the axes A3 and A4, and occupies generally the same position as the rollers 23 and 24 in the width direction of the rollers 23 and 24. Therefore, the waste film 1 passes repeatedly through the blade 321 while being transported while being repeatedly wound around the third roller 23 and the fourth roller 24. In other words, the cutting edge of the blade 321 repeatedly comes into contact with the waste film 1 that is repeatedly wound around the rollers 23 and 24, with a slight gap in the width direction of the rollers 23 and 24. As a result, one side of the waste film 1 can be scraped repeatedly by the blade 321, while the second removal mechanism M2 has a compact configuration. Therefore, the functional layer 13 is efficiently removed from the waste film 1.

[0045] The second removal section 32 further includes an air cylinder 322. The air cylinder 322 applies pressure to the blade 321 so as to press it against the waste film 1. This allows the cutting edge of the blade 321 to firmly contact the waste film 1 during transport with a certain level of pressure or more, enabling the functional layer 13 to be removed from the waste film 1 more efficiently.

[0046] 4 and 5, in the first removal mechanism M1, the direction in which the waste film 1 rotates between the first roller 21 and the second roller 22 (clockwise) is opposite to the direction in which the waste film 1 rotates between the third roller 23 and the fourth roller 24 (counterclockwise) in the second removal mechanism M2. As a result, the side of the waste film 1 that does not contact the rollers 21 and 22 and that contacts the blade 311 and the side of the waste film 1 that does not contact the rollers 23 and 24 and that contacts the blade 321 are opposite sides of the waste film 1. Therefore, in this embodiment, the functional layers 12 and 13 are removed from both sides of the waste film 1 while the waste film 1 passes through the two removal mechanisms M1 and M2.

[0047] The removal device 10 further includes a dust collector 35. The dust collector 35 has a suction port near the blades 311 and 321, and sucks in the debris of the functional layers 12 and 13 scraped off by the blades 311 and 321 through the suction port, collects the debris through a duct connected to the suction port, and separates it using a filter or the like for disposal.

[0048] The waste film 1 that has finally passed through the rollers 23 and 24, that is, the treated film 2, is then wound up into a roll.

[0049] [3. Features] In the above embodiment, the first roller 21 and the second roller 22 are arranged non-parallel, so that the waste film 1 is repeatedly wound between the rollers 21 and 22. Then, while the waste film 1 is repeatedly wound between the rollers 21 and 22 and transported, it passes through the blade 311 repeatedly, and the functional layer 12 is repeatedly scraped off. Similarly, the third roller 23 and the fourth roller 24 are arranged non-parallel, so that the waste film 1 is repeatedly wound between the rollers 23 and 24. Then, while the waste film 1 is repeatedly wound between the rollers 23 and 24 and transported, it passes through the blade 321 repeatedly, and the functional layer 13 is repeatedly scraped off. As a result, the removal device 10 can be configured compactly, while the surface of the waste film 1 can be scraped multiple times by the blades 311 and 321. Therefore, the functional layers 12 and 13 are efficiently removed from the waste film 1.

[0050] [4. Modifications] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible without departing from the spirit of the present invention. For example, the following modifications are possible. Furthermore, the gist of the following modifications can be combined as appropriate.

[0051] [4-1] In the above embodiment, the first removal unit 31 and the second removal unit 32 are configured to include blades 311 and 321, respectively. However, the configuration for physically removing the functional layers 12 and 13 from the waste film 1 is not limited to this. For example, both or one of the first removal unit 31 and the second removal unit 32 may be configured to include a polishing roller, a file, a metal rotating brush, a rotary blade, a scraper, a belt sander, a blasting device (including a wet blasting device), etc.

[0052] [4-2] The first removal unit 31 and the second removal unit 32 are not limited to the above-mentioned example and can be arranged in various positions. For example, as shown in Figure 6, the blade 311 included in the first removal unit 31 may be arranged in a position facing the first roller 21 and / or the second roller 22, or alternatively or in addition, the blade 321 included in the second removal unit 32 may be arranged in a position facing the third roller 23 and / or the fourth roller 24. Also, as also shown in Figure 6, the blade 311 may be arranged between the first roller 21 and the second roller 22 at a position facing the inner surface of the waste film 1 (the surface on the side that contacts the rollers 21 and 22), or alternatively or in addition, the blade 321 may be arranged between the third roller 23 and the fourth roller 24 at a position facing the inner surface of the waste film 1 (the surface on the side that contacts the rollers 23 and 24).

[0053] [4-3] As shown in FIG. 7, the direction in which the waste film 1 rotates in the first removal mechanism M1 and the direction in which the waste film 1 rotates in the second removal mechanism M2 may be the same. In this case, in the example of FIG. 7, the side of the waste film 1 that does not contact the rollers 21 and 22 but contacts the blade 311 and the side of the waste film 1 that does not contact the rollers 23 and 24 but contacts the blade 321 are the same side of the waste film 1. Therefore, while the waste film 1 passes through the two removal mechanisms M1 and M2, the functional layer 12 is removed from only one side of the waste film 1. In this case, the two removal mechanisms M1 and M2 may have different configurations for physically removing the functional layer 12. For example, the first removal unit 31 may include the blade 311, and the second removal unit 313 may include a polishing roller.

[0054] Alternatively, the direction in which the waste film 1 rotates in the first removal mechanism M1 and the direction in which the waste film 1 rotates in the second removal mechanism M2 may be the same, and one of the first removal unit 31 and the second removal unit 32 may be positioned opposite the inner surface of the waste film 1 (the surface that comes into contact with the rollers 21, 22 or the rollers 23, 24), and the other may be positioned opposite the outer surface of the waste film 1 (the surface that does not come into contact with the rollers 21, 22 or the rollers 23, 24). In this case, the functional layers 12 and 13 are removed from both surfaces of the waste film 1 while the waste film 1 passes through the two removal mechanisms M1 and M2.

[0055] [4-4] One of the first removal mechanism M1 and the second removal mechanism M2 may be omitted from the removal device 10. Alternatively, multiple removal devices 10 may be connected together, and the functional layers 12, 13 may be removed from the waste film 1 by these removal devices 10 while the waste film 1 passes through these removal devices 10. In this case, the configurations for physically removing the functional layers 12, 13 included in the multiple removal devices 10 may be different. For example, the first removal device 10 may be configured to remove the functional layers 12, 13 from both sides of the waste film 1 using blades provided in the removal mechanisms M1, M2, and the second removal device 10 may be configured to remove the functional layers 12, 13 from both sides of the waste film 1 using polishing rollers provided in the removal mechanisms M1, M2.

[0056] [4-5] The waste film 1 may be heated and thermally shrunk before it reaches the first roller 21. In this case, the waste film 1 becomes thicker before the functional layers 12, 13 are removed, so that even if tension is applied to the waste film 1 during transport, it is possible to prevent the waste film 1 from breaking as the functional layers 12, 13 are removed. The waste film 1 can be heated, for example, by sandwiching it between heated rollers, immersing it in hot water, passing it through a hot air tunnel, or spraying it with steam. When performing such thermal shrinkage, the thickness of the film body 11 after thermal shrinkage can be, for example, 1.5 to 3 times the thickness of the film body 11 before thermal shrinkage. [Explanation of symbols]

[0057] 1. Waste film (film edges) 11 Film body 12,13 Functional Layer 2. Processed film 3 Recycled resin raw materials 3a Fluff 3b Pellets 3c powder 3d granules 4. Recycled film 5 Product Film 50 Product Department 10 Removal device 20. Recycled resin raw material manufacturing equipment 30 Film manufacturing equipment M1 1st removal mechanism M2 2nd removal mechanism 21 First Roller 22 Second Roller 23 Third Roller 24 Fourth Roller A1~A4 axis 31 1st removal section 32 Second removal section 311,321 blades 312,322 Air cylinder 35 Dust collector 40 Support stand 41 Rear wall 411 Left side 412 Right side S1 Resource Recycling System

Claims

1. A removal device for removing a functional layer from a film including the functional layer, A first roller; A second roller; a first removal unit that is disposed near the film that is wound between the first roller and the second roller and transported, and that removes the functional layer from the film; Equipped with an axis of the first roller and an axis of the second roller extend non-parallel to each other so that the film is repeatedly wound between the first roller and the second roller; the film repeatedly passes through the first removal section while being transported while being repeatedly wound between the first roller and the second roller; removal device.

2. A third roller; A fourth roller; a second removal unit that is disposed near the film that is wound between the third roller and the fourth roller and transported, and that further removes the functional layer from the film; Furthermore, the third roller and the fourth roller are disposed downstream of the first roller and the second roller, an axis of the third roller and an axis of the fourth roller extend non-parallel to each other so that the film is repeatedly wound between the third roller and the fourth roller; the film repeatedly passes through the second removal section while being transported while being repeatedly wound between the third roller and the fourth roller; The removal device of claim 1 .

3. a direction in which the film rotates between the first roller and the second roller is opposite to a direction in which the film rotates between the third roller and the fourth roller; The removal device of claim 2 .

4. 4. A method for manufacturing a processed film by removing the functional layer from the film using the removal device according to claim 1. A method for producing a processed film, comprising:

5. 10. A method for producing a recycled resin raw material using the treated film produced by the method according to claim 4 as a starting material. A method for producing recycled resin raw materials, comprising:

6. 10. A recycled film produced by using the recycled resin raw material produced by the production method according to claim 5 as at least a part of the raw material. A method for producing a recycled film, comprising:

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