Recycled resin raw material manufacturing method, recycled film manufacturing method, and resin film processing device

Abstract

To provide a method for producing recycled resin raw materials with little foreign matter contamination. [Solution] A method for producing recycled resin raw materials includes preparing a roll of resin film spliced with a splice tape having an adhesive layer, unwinding the resin film from the roll, removing the splice tape from the resin film unwound from the roll, and producing recycled resin raw materials using the resin film from which the splice tape has been removed as a starting material.

Description

[Technical Field]

[0001] The present invention relates to a method for producing recycled resin raw materials, a method for producing recycled films, and a processing device for resin films. [Background technology]

[0002] Patent Document 1 discloses a technology for recycling recycled resin raw materials from rolled resin films such as scraps and unused stock products. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-163841 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the resin film wound onto a single film roll is not always a single piece without any seams. Rather, in many cases, there are breaks along the way, and the breaks are repaired with splice tape, such as aluminum tape or colored vinyl tape. This occurs because the resin film is cut off at a location where there is a problem, such as a printing defect, or because the length of the resin film to be wound onto the film roll is too short. When recycled resin raw materials are produced from such film rolls, the splice tape can become mixed into the recycled resin raw materials as a foreign matter, potentially degrading the quality of the recycled resin raw materials.

[0005] An object of the present invention is to produce recycled resin raw materials with little foreign matter contamination. Another object of the present invention is to produce recycled film with little foreign matter contamination using such recycled resin raw materials. Yet another object of the present invention is to provide a resin film processing device suitable for producing such recycled resin raw materials. [Means for solving the problem]

[0006] Item 1. Preparing a roll of a resin film spliced with a splice tape having an adhesive layer; unwinding the resin film from the roll; removing the splice tape from the resin film unwound from the roll; producing a recycled resin raw material using the resin film from which the splice tape has been removed as a starting material; A method for producing recycled resin raw materials, comprising:

[0007] Item 2. Connecting the separated ends of the resin film that have been separated by removing the splice tape. further comprising The manufacturing of the recycled resin raw material means manufacturing the recycled resin raw material using the resin film in which the separated ends are connected to each other as a starting material. Item 1. A method for producing recycled resin raw materials.

[0008] Item 3. Connecting the separated ends includes joining the separated ends with a resin tape; Item 2. A method for producing recycled resin raw materials.

[0009] Item 4. The resin film and the resin tape are heat-shrinkable films. Item 3. A method for producing recycled resin raw materials.

[0010] Item 5. Removing the splice tape Detecting the position of the splice tape included in the resin film; removing the splice tape from the resin film based on the detected position; Including, Item 5. A method for producing a recycled resin raw material according to any one of Items 1 to 4.

[0011] Item 6. The splice tape is an aluminum tape or a colored vinyl tape. Item 6. A method for producing a recycled resin raw material according to any one of Items 1 to 5.

[0012] Item 7. The recycled resin raw material produced by the production method according to any one of items 1 to 6 is used as at least a part of the raw material to produce a recycled film. A method for producing a recycled film, comprising:

[0013] Item 8. A feeding unit that feeds out a resin film from a roll around which the resin film is wound and spliced with a splice tape having an adhesive layer; a removal unit that removes the splice tape from the resin film unwound from the roll; A resin film processing device comprising: [Effects of the Invention]

[0014] According to the present invention, it is possible to produce recycled resin raw materials with little foreign matter contamination. Furthermore, it is possible to produce recycled films with little foreign matter contamination using such recycled resin raw materials. Furthermore, a resin film processing device suitable for producing such recycled resin raw materials is provided. [Brief explanation of the drawings]

[0015] [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. 1 is a diagram illustrating an example of a removal device according to an embodiment. [Figure 4] 4 is a plan view showing an example of a first processing device included in the removal device of FIG. 3. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] 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.

[0017] [1. Structure of the resource circulation system] In recent years, marine pollution caused by plastic waste has become a global problem. Resource recycling has attracted attention as a means of addressing this problem. FIG. 1 is a schematic diagram showing a resource recycling system S1 that uses a method for producing recycled resin raw materials 3 and a method for producing recycled film 4 according to this embodiment. As shown in FIG. 1, in the resource recycling system S1, waste resin film (hereinafter referred to as "waste film") 1 is recycled to produce recycled resin raw materials 3. Various resin products can be produced from the recycled resin raw materials 3, and for example, new resin films (hereinafter referred to as "recycled films") 4 are produced. The waste film 1 is a packaging material in the form of a film or label that can be used in various fields, such as food, beverages, pharmaceuticals, medical products, chemicals, cosmetics, toiletries, industrial products, and agricultural products. The recycled film 4 can also be used as a similar packaging material.

[0018] Although not limited thereto, the waste film 1 is, for example, a heat-shrinkable film before heat shrinkage. In this case, the waste film 1 may be, for example, a uniaxially stretched film that heat shrinks mainly in the width direction, i.e., the TD (Transverse Direction). The heat shrinkage rate of the waste film 1 in the main shrinkage direction can be selected appropriately depending on the application, but when immersed in 90°C hot water for 10 seconds, it is preferably 30% or more, and more preferably 50% or more.

[0019] 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 resin 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 antiblocking 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. Among 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 can be, for example, a pattern, a letter, a symbol (e.g., a barcode), or a combination thereof. The printing layer can be formed, for example, by using a gravure printing plate.

[0020] The waste film 1 may be, for example, an unused product, scrap material, an intermediate processed product, a leftover product, a defective product, a prototype, or a discarded product. The waste film 1 may be, for example, a product film having a product portion used to package the target product and a film selvedge that is continuous with the edge of the product portion. Alternatively, the waste film 1 may be, for example, a product portion cut out from such a product film, a film selvedge, or a lead film used for printing registration (pattern alignment). The film selvedge is separated from the product portion by cutting the product film along the boundary between the product portion and the film selvedge before shipping the product portion. The product portion includes, as at least one of the functional layers 12 and 13, a printed layer on which, for example, information about the target product to be packaged by the product portion is printed. The film selvedge includes, as at least one of the functional layers 12 and 13, a printed layer on which, for example, information for checking the printing status of the product portion is printed. The product portion is used to package various containers, such as plastic containers, glass containers, and paper containers. When the product part is a heat-shrinkable film, it is heat-shrunk by heating and, for example, attached to the container by adhering closely to the outer surface of the container along the outer shape of the container. The product part is, for example, formed into a cylindrical shape and placed on the container so as to cover the container from the outside, and then heat-shrunk and attached to the container. The product part is formed into a cylindrical shape, for example, by overlapping both ends of the TD and sealing the overlapped portion in the MD (machine direction). In this case, when the product part is attached to the container as a label, the TD of the product part typically corresponds to the horizontal direction of the container, and the MD of the product part typically corresponds to the vertical direction of the container.

[0021] The thickness of the film body 11 is not particularly limited and can be selected appropriately depending on the application. However, it is preferably 10 μm or more, more preferably 12 μm or more, and even more preferably 15 μm or more. 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. The film body 11 may be a single layer or a multilayer. The film body 11 may include a layer containing a mixture of different types of resins. The film body 11 may also include 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 various additives. Examples of additives include antiblocking agents, heat stabilizers, antioxidants, UV absorbers, light stabilizers, lubricants, antistatic agents, flame retardants, antibacterial agents, and fluorescent brighteners.

[0022] 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.

[0023] The thickness of each of the functional layers 12 and 13 is not particularly limited and can be selected appropriately depending on the application. It 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. The back surface here refers to the inner surface facing the target product when packaging the target product, 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 design printing process.

[0024] The waste film 1 is a long film that is wound up and managed in the form of a film roll (rolled body) R1 for storage and handling reasons. The waste film 1 wound onto a single film roll R1 is not necessarily a single seamless piece; in many cases, it is broken along the way, and the broken portion is joined with splice tape 5. That is, the film roll R1 is wound with multiple pieces of waste film 1 that are connected to form a longer length by splicing them with splice tape 5. This is because a portion of the resin film that has a problem, such as a printing defect, has been cut off, or the length of the resin film that was intended to be wound onto the film roll R1 was too short. The splice tape 5 is an adhesive tape that has an adhesive layer and can be attached to the resin film, such as aluminum tape or colored vinyl tape.

[0025] Referring again to FIG. 1, the resource circulation system S1 includes a removal device 10, a manufacturing device 20 for recycled resin raw material 3, and a film manufacturing device 30. FIG. 3 is a diagram showing an example of the removal device 10. To use the removal device 10, first, a film roll R1 around which a waste film 1 is wound is prepared and set in the removal device 10. Next, the waste film 1 is unwound from the film roll R1, and the unwound waste film 1 is processed to produce a processed film 2. The processed film 2 is obtained by removing the splice tape 5 and functional layers 12 and 13 from the waste film 1. Although not limited thereto, in this embodiment, the removal device 10 is an apparatus that processes a resin film while transporting it roll-to-roll.

[0026] As shown in FIG. 3, the removal device 10 includes a first processing device 40 and a second processing device 50. The first processing device 40 removes the splice tape 5 from the waste film 1 unwound from the film roll R1. When the splice tape 5 is removed by the first processing device 40, the waste film 1 is severed at the location where the splice tape 5 was attached. However, in this embodiment, the severed location in the waste film 1 is reconnected by a sealer 430 (see FIG. 4) included in the first processing device 40. Therefore, the treated film 2 also becomes a long film similar to the waste film 1. The second processing device 50 removes the functional layers 12 and 13 from the waste film 1 from which the splice tape 5 has been removed. The functional layers 12 and 13 are removed to prevent their mixing with the recycled resin raw material 3 from degrading the functionality of the recycled resin raw material 3 and the recycled film 4 produced from the recycled resin raw material 3. The processed film 2 typically does not have the functional layers 12, 13 and is composed of only the film body 11, but some of the functional layers 12, 13 may remain.

[0027] The removal device 10 further includes a control unit 100 that controls the operations of each unit (including the processing devices 40 and 50) of the removal device 10. The control unit 100 is composed of a CPU (Central Processing Unit), a storage device, and the like.

[0028] In the resource circulation system S1, a manufacturing device 20 further produces recycled resin raw material 3 from the treated film 2. The manufacturing device 20 uses the treated film 2 produced by the removal device 10 as a starting material to produce recycled resin raw material 3. The recycled resin raw material 3 is a resin raw material obtained by processing the treated film 2 into a shape that is easy to handle when producing recycled film 4 from the treated 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. Some types of pellets 3b are produced by heating and melting the raw material and then solidifying it, but granulated material 3d differs from such types of pellets 3b in that it is a mass obtained by compressing and solidifying powdered raw material without heating and melting it. In addition, recycled resin raw materials 3 that are produced without heating and melting the raw materials, such as fluff 3a, powder 3c, or granules 3d, can be more susceptible to thermal degradation than recycled resin raw materials 3 that are produced by heating and melting the raw materials and then solidifying them, such as the above-mentioned type of pellets 3b, because they do not undergo excessive thermal history such as heating and melting during processing.

[0029] 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:

[0030] The processed film 2 can be processed into pellets 3b using, for example, a known resin pellet manufacturing machine. For example, pellets 3b can be manufactured by supplying fluff 3a to an extruder, heating and melting it in the extruder, extruding it through a die, and cutting the extruded material into an appropriate shape. Note that pellets 3b may be manufactured using not only the processed film 2 (fluff 3a) but also virgin resin raw materials and / or chemically recycled resin raw materials (hereinafter referred to as virgin resin raw materials, etc.). In this case, virgin resin raw materials, etc. are also supplied to the extruder in addition to fluff 3a. This method produces pellets 3b of the type that are produced by heating and melting raw materials and then solidifying them.

[0031] Another type of processing method for pellets 3b is, for example, the following method. A narrow edge of the processed film 2 is unwound from a roll, and a single edge or a bundle of edges of the film is twisted by rotating it parallel to the conveying direction. The twisted edge is compressed and then cut to a predetermined size. In this method, pellets 3b are produced without heating and melting the raw material.

[0032] 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.

[0033] The processed film 2 can be processed into the 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.

[0034] In the resource circulation system S1, a film manufacturing apparatus 30 further produces a recycled film 4 from the recycled resin raw material 3. The film manufacturing apparatus 30 uses the recycled resin raw material 3 produced by the manufacturing apparatus 20 to produce the recycled film 4. 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 may be appropriately stretched to impart heat shrinkability and processed into a heat-shrinkable film. Furthermore, functional layers such as functional layers 12 and 13 may be appropriately laminated on the recycled film 4.

[0035] The recycled film 4 may be produced using not only the recycled resin raw material 3 but also virgin resin raw materials, etc. In this case, for example, the extruder is supplied with virgin resin raw materials, etc. in addition to the recycled resin raw material 3. The recycled film 4 may be constructed similarly to the film body 11 contained in the waste film 1 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-layered or multi-layered. When the recycled film 4 is multi-layered, at least one layer contained in the recycled film 4 may be made of recycled resin raw materials 3, and at least one other layer may be made of only virgin resin raw materials, etc., out of virgin resin raw materials, etc. and recycled resin raw materials 3. For example, when 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 materials 3 and virgin resin raw materials, etc., and the adjacent layers may be made of only virgin resin raw materials, etc., out of virgin resin raw materials, etc. and recycled resin raw materials 3.

[0036] [2. Configuration of removal device] Referring again to FIG. 3 , the configuration of the removal device 10 will be described in detail. In addition to the two processing devices 40 and 50, the removal device 10 also includes an unwinder 61, a winder 62, and a guide roller 60. The unwinder 61 is located at the most upstream position of the removal device 10 and has a shaft that rotatably holds the film roll R1. When the film roll R1 set on the shaft of the unwinder 61 rotates, the waste film 1 is unwound from the unwinder 61 and transported downstream. A number of guide rollers 60 are installed on the transport path. At least some of the guide rollers 60 may be drive rollers. The waste film 1 is guided by these guide rollers 60 and transported to the winder 62, located at the most downstream position of the removal device 10. During this process, the waste film 1 passes through the two processing devices 40 and 50 and is processed into a processed film 2. The processed film 2 is wound up into a film roll R2 by the winder 62. The winder 62 has a shaft (typically a drive shaft) that rotatably holds the film roll R2. The unwinder 61 and the winder 62 can be, for example, a two-shaft turret type. The unwinder 61, the winder 62, and the guide roller 60 are a mechanism that unwinds and transports the waste film 1 from the film roll R1, and is an example of a unwinding section.

[0037] FIG. 4 is a plan view of the processing device 40. As shown in the figure, the processing device 40 includes a detection unit 410, a cutting device 420, and a sealer 430. The detection unit 410 is disposed near the transport path of the waste film 1 and detects the position of the splice tape 5 included in the waste film 1. The detection unit 410, for example, performs fixed-point observation of the waste film 1 at a position slightly upstream of the cutting device 420 and detects the position where the splice tape 5 has passed. In this embodiment, the detection unit 410 is composed of a camera and a processor (which may be integrated with the control unit 100 or separate) that processes images captured by the camera, but is not limited to this. For example, if the splice tape 5 is aluminum tape or the like, the detection unit 410 can also be composed of a metal detector.

[0038] When the position of the splice tape 5 is detected by the detection unit 410, the control unit 100 drives the cutting device 420 arranged near the conveying path of the waste film 1. The cutting device 420 removes the splice tape 5 from the waste film 1 based on the position of the splice tape 5 detected by the detection unit 410. The cutting device 420 is an example of a removing unit. For example, the cutting device 420 cuts the waste film 1 slightly upstream and slightly downstream of the location where the splice tape 5 is attached in a direction perpendicular to the conveying direction (TD). The cutting device 420 can be configured in any way as long as it has a mechanism that can cut the resin film, and for example, it may be configured to have a blade, or may be a laser cutter or the like. As a result, the splice tape 5 is cut off from the waste film 1, and the waste film 1 is separated into an upstream side and a downstream side at the location where the splice tape 5 was attached. The splice tape 5 cut off from the waste film 1 is appropriately collected by a suction device or the like. In the example of Figure 4, holding mechanisms 421 and 422 for holding the waste film 1 are arranged near the upstream side and downstream side of the cutting device 420, respectively, to prevent the waste film 1 from falling off the conveying path at the location where the splice tape 5 is cut off. The holding mechanisms 421 and 422 can each be composed of, for example, a pair of rollers (typically, driven rollers) arranged to sandwich the waste film 1.

[0039] When the removal of the splice tape 5 by the cutting device 420 is completed, the control unit 100 drives the sealer 430. More specifically, the control unit 100 retreats the cutting device 420 from the vicinity of the conveying path and moves the sealer 430 to the vicinity of the conveying path instead. In the example of Fig. 4, the cutting device 420 and the sealer 430 are connected to the same movable shaft, and the sealer 430 moves simultaneously with the retreat of the cutting device 420.

[0040] After being moved near the conveying path, the sealer 430 connects the upstream and downstream separated ends of the waste film 1 that have been separated by removing the splice tape 5. In this embodiment, the sealer 430 joins the upstream and downstream separated ends of the waste film 1 with a resin tape 6. The resin tape 6 is preferably a tape without an adhesive layer. Although not limited thereto, in this embodiment, the sealer 430 is an ultrasonic sealer. For example, the sealer 430 overlaps the resin tape 6 on the waste film 1 so as to cover the upstream and downstream separated ends, and then adheres (welds) the resin tape 6 to the portions of the waste film 1 near the upstream and downstream separated ends. This reconnects the disconnected portions of the waste film 1 via the resin tape 6. At this time, it is preferable to seal the waste film 1 in a broken line (perforated line) rather than a straight line so as to prevent the waste film 1 from tearing at the sealed portions with the resin tape 6. The resin tape 6 may be supplied to the sealer 430 by being unwound from a roll, and cut to an appropriate length in the sealer 430. Alternatively, a configuration may be adopted in which a large number of resin tapes 6 cut to an appropriate length in advance are prepared, and the tapes are supplied to the sealer 430 one by one when splicing the waste film 1.

[0041] It is preferable that the resin tape 6 is a film containing the same type of resin component as the film body 11 so as not to become a foreign substance to the resin component contained in the waste film 1 recycled into the recycled resin raw material 3. It is also preferable that the resin tape 6 is not laminated with functional layers such as functional layers 12 and 13 and is composed only of the film body. If the waste film 1 is a heat-shrinkable film before heat shrinkage, it is also preferable that the resin tape 6 is a heat-shrinkable film before heat shrinkage. In this case, when the waste film 1 joined with the resin tape 6 is heat-shrunk in the second processing device 50 at the subsequent stage, the resin tape 6 heat-shrinks in accordance with the waste film 1. This makes it difficult for the resin tape 6 to peel off from the waste film 1 as the waste film 1 heat-shrinks, preventing the waste film 1 from being broken again.

[0042] The control unit 100 temporarily stops the transport of the waste film 1 in the first processing device 40 while the cutting device 420 and the sealer 430 are operating. The removal device 10 further includes an accumulator 70 disposed between the first processing device 40 and the second processing device 50. The accumulator 70 has a plurality of accumulator rollers around which the waste film 1 is wound, and the amount of waste film 1 stored can be adjusted by raising and lowering these accumulator rollers. As a result, even if the transport of the waste film 1 in the first processing device 40 is stopped, the waste film 1 continues to be transported in the subsequent second processing device 50, allowing the second processing device 50 to continue its operation.

[0043] In the second processing device 50, the splice tape 5 is removed, and instead the functional layers 12, 13 are removed from the waste film 1 spliced with the resin tape 6. The second processing device 50 is configured, for example, to remove the functional layers 12, 13 by physical or chemical methods, or both. Examples of physical methods include removing the functional layers 12, 13 from the film body 11 by mechanical actions such as rubbing, scraping, or peeling using abrasive rollers, sandpaper, metal rotating brushes, rotating blades, scrapers, belt sanders, blasting devices (including wet blasting devices), etc. Examples of chemical methods include immersing the waste film 1 in a solution containing a solvent capable of dissolving the functional layers 12, 13, or applying such a solution to the waste film 1.

[0044] In the second processing device 50, the waste film 1 can be heat-treated and thermally shrunk in the process of removing the functional layers 12, 13. The heat treatment here includes clamping the waste film 1 between heated rollers, immersing it in hot water, passing it through a hot air tunnel, spraying it with steam, etc.

[0045] The waste film 1 (i.e., the treated film 2) from which the functional layers 12, 13 have been removed in the second processing device 50 is then wound up by a winder 62 to become a film roll R2. The film roll R2 is then provided to the manufacturing device 20, where the recycled resin raw material 3 is manufactured.

[0046] [3. Features] In the above embodiment, the recycled resin raw material 3 is produced using the waste film 1 from which the splice tape 5 has been removed as the starting material. Therefore, it is possible to produce a recycled resin raw material 3 with little foreign matter mixed in. In turn, it is possible to produce a recycled film 4 with little foreign matter mixed in using such recycled resin raw material 3.

[0047] In addition, in the above embodiment, the disconnected portions of the waste film 1 caused by the removal of the splice tape 5 are reconnected by the sealer 430. Therefore, even after the splice tape 5 is removed, the resin film can be efficiently processed while being transported roll to roll.

[0048] In addition, in the above embodiment, the disconnected portions of the waste film 1 caused by removing the splice tape 5 are reconnected by joining with the resin tape 6. Therefore, it is possible to prevent new foreign matter from being mixed into the treated film 2, which is the starting material for the recycled resin raw material 3.

[0049] [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.

[0050] [4-1] The method for removing the splice tape 5 from the waste film 1 is not limited to the above example. For example, the splice tape 5 may be automatically peeled off by gripping and pulling the end portion.

[0051] [4-2] The method for connecting the disconnected portions of the waste film 1 is not limited to the above-mentioned method (ultrasonic sealing), but may be high-frequency sealing, heat sealing, or solvent sealing.

[0052] [4-3] In the above embodiment, the broken portion of the waste film 1 is joined with the resin tape 6, but it may also be joined without using the resin tape 6. For example, the portion near the upstream separated end of the waste film 1 that has been separated by removing the splice tape 5 may be overlapped with the portion near the downstream separated end, and the overlapped portions may be directly bonded (welded).

[0053] [4-4] In the above embodiment, the disconnected portions of the waste film 1 are reconnected, but the waste film 1 may be collected without reconnecting the disconnected portions and used as the starting material to manufacture the recycled resin material 3. In this case, the splice tape 5 may be removed after the functional layers 12, 13 are removed from the waste film 1.

[0054] [4-5] In the above embodiment, an example has been shown in which functional layers are laminated on both the front and back surfaces of the film body 11, but the functional layer may be laminated on only one surface of the film body 11. That is, one of the functional layers 12, 13 may be omitted. In this case, it is preferable that the resin tape 6 be placed on the surface of the film body 11, of the front and back surfaces, on which the functional layer is not laminated, and adhered (welded) to it, so as not to interfere with the removal of the functional layer by the second processing device 50 in the subsequent stage. [Explanation of symbols]

[0055] 1. Waste film 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 splice tape 6 Resin tape 10 Removal device 20. Recycled resin raw material manufacturing equipment 30 Film manufacturing equipment 40 1st processing device 410 Detection unit 420 Cutting Device 421,422 Pressing mechanism 430 Sealer 50 2nd processing device 60 Guide roller 61 Unwinding machine 62 Winder 70 Accumulator 100 control section S1 Resource Recycling System R1, R2 film roll

Claims

1. preparing a roll of a resin film spliced with a splice tape having an adhesive layer; unwinding the resin film from the roll; removing the splice tape from the resin film unwound from the roll; connecting the separated ends of the resin film separated by removing the splice tape; The splice tape is removed, and the resin film from which the separated ends are connected is used as a starting material to manufacture a recycled resin material. A method for producing recycled resin raw materials, comprising:

2. Connecting the separated ends includes joining the separated ends with a resin tape. A method for producing the recycled resin raw material according to claim 1.

3. The resin film and the resin tape are heat-shrinkable films. The method for producing the recycled resin raw material according to claim 2.

4. removing the splice tape Detecting the position of the splice tape included in the resin film; removing the splice tape from the resin film based on the detected position; Including, A method for producing the recycled resin raw material according to any one of claims 1 to 3.

5. The splice tape is an aluminum tape or a colored vinyl tape. A method for producing the recycled resin raw material according to any one of claims 1 to 3.

6. A recycled film is produced by using the recycled resin raw material produced by the production method according to any one of claims 1 to 3 as at least a part of the raw material. A method for producing a recycled film, comprising:

7. a feeding section that feeds out a resin film from a roll around which the resin film is wound and spliced with a splice tape having an adhesive layer; a removal unit that removes the splice tape from the resin film unwound from the roll; a connecting portion that connects the separated ends of the resin film that have been separated by removing the splice tape; A resin film processing device comprising:

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