WO2023013689A1 - 熱収縮性フィルム及びその製造方法 - Google Patents
熱収縮性フィルム及びその製造方法 Download PDFInfo
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- WO2023013689A1 WO2023013689A1 PCT/JP2022/029831 JP2022029831W WO2023013689A1 WO 2023013689 A1 WO2023013689 A1 WO 2023013689A1 JP 2022029831 W JP2022029831 W JP 2022029831W WO 2023013689 A1 WO2023013689 A1 WO 2023013689A1
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Definitions
- the present invention relates to a heat-shrinkable film and its manufacturing method.
- Patent Document 1 discloses a method for manufacturing a heat-shrinkable film using recycled raw materials.
- the heat-shrinkable film produced by this production method contains virgin raw materials and recycled raw materials.
- the same raw material for example, a raw material containing polyester resin as a main component, is used as the virgin raw material and the recycled raw material in order to suppress deterioration of various physical properties such as optical properties.
- the purpose of the present invention is to provide a high-quality heat-shrinkable film using recycled raw materials and to provide a method for producing the same.
- a method for producing a heat-shrinkable film according to the first aspect of the present invention includes preparing a packaging material containing a plurality of film labels having a resin layer containing a thermoplastic resin as a main component and a printed layer, and the resin layer recovering a first recycled raw material and a second recycled raw material different from the first recycled raw material, a core layer containing at least the first recycled raw material and the second recycled raw material, and laminated on the core layer and forming a resin film comprising at least a surface layer containing a thermoplastic resin, and collecting the first recycled raw material and the second recycled raw material after the packaging material and the printed layer have been removed.
- a method for producing a heat-shrinkable film according to a second aspect of the present invention is the method for producing a heat-shrinkable film according to the first aspect, wherein the molding of the resin film comprises
- the thermoplastic resin is a polyester-based resin or a polystyrene-based resin.
- a method for producing a heat-shrinkable film according to a third aspect of the present invention is a method for producing a heat-shrinkable film according to the first aspect or the second aspect, wherein the polystyrene resin is removed from intermediate materials other than the packaging material. Further comprising recovering, and forming the resin film comprises forming the core layer containing the recovered polystyrene-based resin.
- a heat-shrinkable film according to the fourth aspect of the present invention comprises a core layer and a surface layer.
- the core layer is composed of a first recycled raw material obtained starting from a packaging material containing a plurality of film labels having a resin layer containing a thermoplastic resin as a main component and a printed layer, and a second recycled raw material different from the first recycled raw material. It contains at least a recycled raw material and an acrylic acid ester-based resin.
- the surface layer is laminated on at least one surface of the core layer and contains a thermoplastic resin.
- One of the first recycled raw material and the second recycled raw material is a polyester-based resin, and the other is a polystyrene-based resin.
- the starting material in which polystyrene-based resin and polyester-based resin are mixed can be used as it is as a recycled material. Moreover, according to the heat-shrinkable film of the present invention, the quality is high even when the above recycled raw materials are used.
- FIG. 1 is a cross-sectional view showing an example of the layer structure of the heat-shrinkable film 10 of the first embodiment.
- the heat-shrinkable film 10 of this embodiment is used, for example, as a base film for a heat-shrinkable film label attached to a container such as a PET bottle or a metal can.
- the heat-shrinkable film 10 includes a core layer 20 and a surface layer 30 laminated on the core layer 20 .
- the core layer 20 of the heat-shrinkable film 10 of the present embodiment is composed of a recycled raw material different from the virgin raw material.
- the heat-shrinkable film 10 of the present embodiment is configured so that the film surface is less likely to be roughened and the quality is high even when the core layer 20 is composed of a recycled raw material that is different from the virgin raw material. be done.
- the total thickness of the heat-shrinkable film 10 is, for example, preferably 10 ⁇ m or more, more preferably 12 ⁇ m or more, even more preferably 15 ⁇ m or more, preferably 70 ⁇ m or less, and 65 ⁇ m or less. and more preferably 60 ⁇ m or less. That is, the total thickness of the heat-shrinkable film 10 is preferably 10 ⁇ m or more and 70 ⁇ m or less, more preferably 12 ⁇ m or more and 65 ⁇ m or less, and even more preferably 15 ⁇ m or more and 60 ⁇ m or less.
- excellent heat-shrinkability, excellent converting properties such as printing and center sealing, or excellent wearability can be obtained.
- the core layer 20 contains at least recycled raw material and may further contain virgin raw material.
- a known thermoplastic resin can be appropriately selected and used.
- virgin raw materials for the core layer 20 include polyamide-based resins, polyester-based resins, polyethylene-based resins, polyvinyl alcohol-based resins, polypropylene-based resins, polystyrene-based resins, and cyclic olefin-based resins.
- the virgin raw material of the core layer 20 is preferably polystyrene-based resin, polyester-based resin, or polypropylene-based resin from the viewpoint of heat shrinkability.
- the virgin raw material of the core layer 20 is a polystyrene resin.
- polystyrene resins include styrene-butadiene copolymers, styrene-isoprene copolymers, styrene-isoprene-butadiene copolymers, styrene-acrylic copolymers, etc., from the viewpoint of exhibiting heat shrinkability.
- polyester-based resin for example, a resin obtained by condensation polymerization of a dicarboxylic acid component and a diol component can be used.
- the heat-shrinkable film 10 contains the polystyrene-based resin as a virgin raw material for the core layer 20, so that variations in heat-shrink properties at low temperatures and shape followability during heat shrink can be suppressed.
- the above-mentioned virgin raw materials may include recycled raw materials excluding fluff and repellets obtained by so-called mechanical recycling of thermoplastic resins contained in film labels and the like.
- Such recycled raw materials include, for example, recycled raw materials obtained by chemical recycling. More specifically, raw materials recycled from monomers obtained by chemically decomposing the thermoplastic resin contained in the molded product are used. mentioned.
- the virgin raw material may include a thermoplastic resin raw material derived from biomass (which is not so-called mechanically recycled).
- recycled raw materials which will be described later, by utilizing these environmental load-reducing raw materials as virgin raw materials, it is possible to provide the heat-shrinkable film 10 in which the thermoplastic resin component is 100% made from environmental load-reducing raw materials.
- the virgin raw material is not limited to the environmental load reducing raw material described above, and may include a raw material of petroleum-derived thermoplastic resin.
- the recycled raw material of the core layer 20 is, for example, a deinked packaging material including a film label including a printed layer collected from the market, or a deinked packaging material that has been downgraded in the printing process.
- a deinked packaging material including a film label including a printed layer collected from the market
- a deinked packaging material that has been downgraded in the printing process.
- one or more thermoplastic resins recovered from the resin composition that is not formed into a film such as resin composition lumps and strand waste generated in the molding apparatus during the film manufacturing process, may be included.
- the deinked material, offcuts and resin composition generated in the manufacturing process of the film label are collectively referred to as "manufacturing intermediate material".
- the recycled raw material of the core layer 20 of the present embodiment includes a first recycled raw material and a second recycled raw material different from the first recycled raw material.
- the first recycled raw material is a polystyrene-based resin
- the second recycled raw material is a polyester-based resin.
- different recycled raw materials are not limited to cases where the types of thermoplastic resins used as recycled raw materials are different. A case where the copolymer composition, weight average molecular weight, etc. is different is also included.
- the first recycled raw material is preferably the same raw material as the virgin raw material of the core layer 20 .
- the packaging material may include an overcoat layer composed of an overcoat agent.
- the overcoat agent is generally an acrylic acid ester resin, and a trace amount of the overcoat agent remains even on the recycled raw material after the deinking treatment. Therefore, the core layer 20 may contain an acrylic acid (methacrylic acid) ester-based resin derived from the overcoat agent in addition to the recycled raw material.
- the ratio of the acrylic acid (methacrylic acid) ester resin to 100% by weight of the total thermoplastic resin constituting the heat-shrinkable film 10 is preferably 0.6% by weight or less, and is 0.4% by weight or less. is more preferable, and 0.2% by weight or less is even more preferable.
- the ratio RX of the recycled raw material in the entire thermoplastic resin of the core layer 20 can be arbitrarily selected.
- the ratio RX is preferably included in the range of 2.5% by weight or more and 100% by weight or less.
- the ratio RA of the second recycled raw material in the recycled raw material (the first recycled raw material + the second recycled raw material) in the entire thermoplastic resin of the core layer 20 can be arbitrarily selected.
- the ratio RA is preferably 80% by weight or less, and 45% by weight or less, from the viewpoint of improving the quality of the heat-shrinkable film 10. is more preferably 15% by weight or less.
- the thickness of the core layer 20 is, for example, preferably 5 ⁇ m or more and 50 ⁇ m or less, more preferably 7 ⁇ m or more and 40 ⁇ m or less.
- the surface layer 30 is laminated on at least one surface of the core layer 20 via an adhesive layer, for example. In this embodiment, the surface layers 30 are laminated on both surfaces of the core layer 20 . The surface layer 30 may be laminated on only one surface of the core layer 20 .
- the surface layer 30 is substantially composed only of virgin raw material different from the virgin raw material of the core layer 20 .
- the virgin raw material for the surface layer 30 can be arbitrarily selected from, for example, the thermoplastic resins exemplified as the virgin raw material for the core layer 20 .
- the virgin raw material of the surface layer 30 is a polyester-based resin.
- substantially composed only of a virgin raw material different from the virgin raw material of the core layer 20 means that the surface layer 30 is composed of the virgin raw material and the recycled material to such an extent that the surface is not substantially roughened. It includes cases where raw materials are included.
- the surface layer 30 is mainly composed of a virgin raw material different from the virgin raw material of the core layer 20 .
- the recycled raw material of the surface layer 30 is preferably the same raw material as the virgin raw material of the surface layer 30 .
- the virgin raw material contained in the surface layer 30 may contain an environmental load-reducing raw material similarly to the core layer 20, and the thermoplastic resin component of the surface layer 30 may be composed of 100% environmental load-reducing raw material.
- the proportion of the polyester resin in the entire thermoplastic resin of the surface layer 30 is preferably 85% by weight or more, more preferably 90% by weight or more. , more preferably 95% by weight or more.
- the thickness of the surface layer 30 is, for example, preferably 1 ⁇ m or more and 30 ⁇ m or less, more preferably 2 ⁇ m or more and 20 ⁇ m or less, and even more preferably 3 ⁇ m or more and 10 ⁇ m or less.
- the surface layer 30 may contain an antiblocking agent for exhibiting antiblocking performance.
- an antiblocking agent antiblocking fine particles
- organic fine particles organic fine particles such as acrylic resin fine particles, styrene resin fine particles, styrene-acrylic resin fine particles, urethane resin fine particles, and silicone resin fine particles can be used. These may or may not be crosslinked, but are preferably crosslinked in order to increase the heat resistance of the fine particles. Among them, from the viewpoint of compatibility with the styrene resin, acrylic resin fine particles are preferable, and polymethyl methacrylate crosslinked fine particles are more preferable.
- the surface of the core layer 20 containing the recycled raw material is covered with the surface layer 30 substantially composed only of the virgin raw material (in other words, the main component is the virgin raw material). , the optical properties and the like are less likely to deteriorate. Therefore, even if the core layer 20 is made of a recycled raw material different from the virgin raw material, the quality of the heat-shrinkable film 10 is high.
- the recycled raw material of the core layer 20 contains the first recycled raw material and the second recycled raw material different from the first recycled raw material, the layer composed of the first recycled raw material and the second recycled raw material are formed.
- a laminated film containing a layer to be formed in other words, a laminated film containing different raw materials can be used as the recycled raw material for the core layer 20 .
- thermoplastic resins contained in packaging materials collected from the market often contain a mixture of polyester resins and polystyrene resins without being separated, and these resins have a specific gravity greater than 1. It cannot be separated by specific gravity.
- the polyester-based resin and the polystyrene-based resin are mixed, they can be mechanically recycled without separation and used as a recycled raw material.
- the heat-shrinkable film 10 in which the core layer 20 contains recycled raw materials and the surface layer 30 is made of substantially virgin raw materials is, for example, a film that reduces the load on the environment due to the resource recycling rate and the like. can appeal.
- the surface layer 30 uses the environmental load reduction material such as the chemically recycled raw material or biomass raw material described above, and the core layer 20 is composed only of recycled raw materials, the resource circulation rate is 100% or the environmental load reduction rate is 100%. can claim.
- the heat-shrinkable film 10X of the second embodiment is different from the first embodiment in that it includes a core layer 20X and a surface layer 30X, and other configurations are the same as those of the first embodiment.
- the heat-shrinkable film 10X of the second embodiment will be described, focusing on the parts that differ from the first embodiment.
- FIG. 2 is a cross-sectional view showing an example of the layer structure of the heat-shrinkable film 10X of the second embodiment.
- the heat-shrinkable film 10X includes a core layer 20X and a surface layer 30X laminated on at least one surface of the core layer 20X.
- the surface layer of the heat-shrinkable film contains recycled raw materials, the surface of the film may be roughened and the glossiness, printing properties, etc. may be lowered.
- the heat-shrinkable film 10X of the present embodiment is configured so that the film surface is less likely to be roughened and the quality is high even when the surface layer 30X is composed of a recycled raw material.
- the core layer 20X is substantially composed of only virgin raw material (in other words, virgin raw material is the main component). Any thermoplastic resin exemplified for the core layer 20 of the heat-shrinkable film 10 of the first embodiment can be used as the virgin raw material of the core layer 20X, for example.
- the virgin raw material of the core layer 20X is polystyrene resin.
- the virgin raw material may be a petroleum-derived raw material, an environmental load-reducing raw material, or a combination of both.
- the surface layer 30X contains virgin raw materials and recycled raw materials.
- the virgin raw material for the surface layer 30X is different from the virgin raw material for the core layer 20X.
- Any thermoplastic resin exemplified for the surface layer 30 of the heat-shrinkable film 10 of the first embodiment can be used as the virgin raw material for the surface layer 30X.
- the virgin raw material of the surface layer 30X is a polyester-based resin.
- the virgin raw material may be a petroleum-derived raw material, an environmental load-reducing raw material, or a combination of both.
- the recycled raw material of the surface layer 30X of the second embodiment includes a third recycled raw material and a fourth recycled raw material different from the third recycled raw material.
- the content that the regenerated raw material is different is the same as that defined in the first embodiment.
- the third recycled raw material is preferably the same raw material as the virgin raw material of the surface layer 30X.
- the third recycled raw material is a polyester-based resin
- the fourth recycled raw material is a polystyrene-based resin.
- the ratio RY of the recycled raw material in the entire thermoplastic resin of the surface layer 30X is 25% by weight or less from the viewpoint of suppressing the occurrence of roughness on the surface of the surface layer 30X.
- the ratio RB of the fourth recycled raw material in the recycled raw material (the third recycled raw material + the fourth recycled raw material) in the entire thermoplastic resin of the surface layer 30X can be arbitrarily selected.
- the ratio RB is preferably 15% by weight or less from the viewpoint of improving the quality of the heat-shrinkable film 10X.
- the recycled raw material of the surface layer 30X contains the third recycled raw material and the fourth recycled raw material different from the third recycled raw material
- the layer composed of the third recycled raw material and the fourth recycled raw material in other words, a laminated film containing different raw materials can be used as the recycled raw material for the surface layer 30X.
- thermoplastic resins contained in packaging materials collected from the market often contain a mixture of polyester resins and polystyrene resins without being separated, and these resins have a specific gravity greater than 1. It cannot be separated by specific gravity.
- the polyester-based resin and the polystyrene-based resin are mixed, they can be mechanically recycled without separation and used as a recycled raw material.
- FIG. 3 is a flow chart showing the flow of the method for manufacturing the heat-shrinkable film 10 using the packaging material as the starting material.
- a method for manufacturing the heat-shrinkable film 10 will be described with reference to FIG.
- packaging materials are prepared as starting materials for manufacturing the heat-shrinkable film 10 .
- the packaging material includes a plurality of film labels that are primarily salvaged from the market. These film labels have a resin layer containing a thermoplastic resin as a main component, and a printed layer composed of ink laminated on the resin layer.
- the resin layer of the film label of the present embodiment contains at least polystyrene-based resin and polyester-based resin.
- the film label may contain a mixture of polystyrene-based resin and polyester-based resin in one resin layer. Additionally, at least some film labels may have an overcoat layer comprised of an overcoat agent. Also, the film label may or may not be heat-shrinkable.
- the packaging material may include other packaging materials such as films containing polystyrene-based resins, polyester-based resins, and mixed resins thereof as main components.
- each of the packaging materials is separated into chips (step S1).
- the method for singulating the packaging material is not particularly limited, and can be performed using a known slitter, shredder, crusher, cutter, or the like.
- the individual pieces of packaging material thus obtained are also referred to as fluff.
- the size of the fluff is not particularly limited, it is preferably a size that can be supplied to an extruder.
- the printed layer is separated from the resin layer of the fluff, and a deinking process is performed to obtain individual pieces of the resin layer from which the printed layer has been removed (hereinafter also referred to as "deinked fluff") (step S2).
- a method of deinking treatment is not particularly limited, and a known method can be adopted. More specifically, as disclosed in Japanese Patent Application Laid-Open No. 11-333952, etc., a method of removing the printed layer by immersing the fluff in an alkaline aqueous solution can be used.
- the overcoat layer is also separated from the resin layer to some extent and removed from the resin layer.
- the deinking fluff obtained in step S2 contains polystyrene-based resin and polyester-based resin. Further, a small amount of acrylic acid (methacrylic acid) ester-based resin derived from the overcoat agent may remain in the deinking fluff.
- step S3 the deinked fluff obtained in step S2 is immersed in an acidic aqueous solution to neutralize the alkalinity.
- the acidic aqueous solution is not particularly limited, for example, an acetic acid aqueous solution can be used.
- an alkaline aqueous solution is used in step S2
- provision of step S3 can save the amount of water used in the cleaning process described later.
- the deinking fluff is washed with water to wash off at least one of the alkaline aqueous solution and the acidic aqueous solution adhering to the deinking fluff (step S4).
- the washed deinking fluff is dried to remove remaining moisture (step S5).
- the drying method is not particularly limited, and drying can be performed using a hot air dryer, a vacuum dryer, an air blower, or the like.
- the drying temperature is preferably lower than or equal to the temperature at which the thermoplastic resin (polystyrene-based resin and polyester-based resin in this embodiment) contained in the deinking fluff does not adhere.
- the deinked fluff obtained in step S5 is included in the raw material of the core layer 20, and a resin film comprising the core layer 20 and the surface layer 30 is molded (step S6). More specifically, the deinked fluff obtained in step S5 and other raw materials are supplied to an extruder and melt-kneaded to extrude a resin film in which at least the core layer 20 and the surface layer 30 are laminated. to mold.
- the extrusion molding may be co-extrusion of the core layer 20 and the surface layer 30 , and in this embodiment, the co-extrusion is performed so that the surface layers 30 are laminated on both sides of the core layer 20 . Additionally, co-extrusion may be performed such that an adhesive layer is laminated between the core layer 20 and the surface layer 30 .
- the core layer 20 is formed by including polystyrene-based resin as the first recycled raw material, polyester-based resin, and acrylic acid (methacrylic acid) ester-based resin as the second recycled raw material.
- the core layer 20 may be formed by including raw materials other than the packaging material used as the starting raw material, for example, the above-described production intermediate materials in the recycled raw materials.
- the core layer may be formed by including the above-described virgin raw material in the raw material. That is, step S6 may include molding the core layer 20 further containing a recycled raw material of polystyrene resin or polyester resin derived from a raw material other than the starting raw material. Alternatively, it may include molding the core layer 20 further containing a virgin raw material of polyester resin.
- Step S6 may further include forming the surface layer 30 whose main component is the above-described virgin raw material.
- the surface layer 30 is molded including a virgin raw material of polystyrene-based resin or polyester-based resin.
- the surface layer 30 is molded such that 100% of the thermoplastic resin forming the surface layer 30 is a virgin raw material of the polyester-based resin.
- step S6 the resin film formed in step S6 is cooled and solidified while being taken up by a take-up roll, and then uniaxially or biaxially stretched. Thereby, the heat-shrinkable film 10 is obtained (step S7).
- Table 1 is a table showing the specifications of the heat-shrinkable films of Examples 1 to 6, the heat-shrinkable film of Comparative Example 1, and the heat-shrinkable film of Reference Example.
- 13 is a table showing specifications of the heat-shrinkable film No. 13 and the heat-shrinkable film of Comparative Example 2.
- Table 2 also shows the specifications of the heat-shrinkable film of the reference example which is the same as Table 1.
- the heat-shrinkable film of Comparative Example 1 does not have a surface layer.
- both the surface layer and the core layer are composed of only a virgin raw material of a polyester-based resin obtained by chemical recycling.
- the surface layer and the core layer are composed only of petroleum-derived virgin raw materials.
- Examples 1 to 4 and 7 to 13 are examples relating to the heat-shrinkable film 10 of the first embodiment.
- Examples 5 and 6 are examples relating to the heat-shrinkable film 10X of the second embodiment.
- surface layers are laminated on both sides of the core layer.
- the virgin raw material of the petroleum-derived polyester resin contains 100 mol% of a component derived from terephthalic acid as a dicarboxylic acid component, 65 mol% of a component derived from ethylene glycol as a diol component, and 20 mol% of a component derived from diethylene glycol. and 15 mol % of a component derived from 1,4-cyclohexanedimethanol.
- the glass transition temperature is 70°C.
- polyester resin derived from chemical recycling is ECOTRIA R100 (manufactured by SK Chemicals).
- the deflection temperature under load at 0.455 MPa based on ISO 75 of this virgin material is 72°C.
- a virgin raw material for petroleum-derived polystyrene resin is a styrene-butadiene copolymer.
- the styrene-butadiene copolymer has a styrene content of 81.3% by weight and a butadiene content of 18.7% by weight.
- the Vicat softening temperature is 80°C.
- the method for producing the heat-shrinkable film of Reference Example is as follows. First, using the raw materials shown in Table 1 as the raw materials constituting the core layer and the surface layer, they were put into an extruder with a barrel temperature of 160 to 250 ° C., extruded from a multi-layer die at 210 ° C. into a sheet with a three-layer structure, and 30 It was solidified by cooling with a take-up roll at °C. Next, after stretching in a tenter stretching machine with a preheating zone of 105° C., a stretching zone of 89 to 91° C., and a heat setting zone of 85° C. at a stretching ratio of 6 times, it is wound up by a winder to obtain a direction perpendicular to the main shrinking direction. was MD (Machine Direction) and the main shrinking direction was TD (Transverse Direction).
- MD Machine Direction
- TD Transverse Direction
- the production method of the recycled raw materials of Examples and Comparative Examples is as follows.
- a printed layer was laminated on one side of the heat-shrinkable film of Reference Example using a gravure printing machine.
- an overcoat layer was laminated by applying an acrylic acid (methacrylic acid) ester resin.
- the heat-shrinkable film having the printed layer is processed into chips by a pulverizer, deinked to form deinked fluff, and further dried with hot air to obtain recycled raw materials of Examples and Comparative Examples. was made.
- the deinking fluff included in the core layer materials of Examples 7, 8, 12 and 13 consisted of 40 weight percent polystyrene and 60 weight percent polyester.
- the deinked fluff included in the core layer stock for Examples 9-11 was composed of 20% by weight polystyrene and 80% by weight polyester.
- the recycled raw material for the core layer of Example 12 included a recycled raw material derived from an intermediate material for the production of the heat-shrinkable film generated in the production process of the heat-shrinkable film of Reference Example.
- the ratio of the recycled raw material derived from the production intermediate material to the total thermoplastic resin constituting the core layer of Example 12 was 70% by weight.
- the ratio of the polyester-based resin in the recycled raw material derived from this production intermediate material was 30% by weight.
- the production methods of the heat-shrinkable films of Examples 1-13 and Comparative Examples 1-2 are as follows.
- Examples 1 to 13 and Comparative Examples 1 and 2 were obtained by using the raw materials shown in Tables 1 and 2 as the raw materials constituting the core layer and the surface layer and mixing them in the ratios shown in Tables 1 and 2.
- a raw material composition constituting a core layer and a surface layer according to No. was obtained.
- heat-shrinkable films of Examples 1-13 and Comparative Examples 1-2 were produced in the same manner as the heat-shrinkable films of Reference Examples.
- the content ratio of the acrylic acid (methacrylic acid) ester resin derived from the overcoat layer is obtained by NMR measurement of each heat-shrinkable film. It was calculated based on the area of the signal derived from the side chain of polymethyl methacrylate in the obtained 1 H-NMR spectrum.
- L MD in the following formula (1) is the length of the test piece in the MD direction after heat shrinking
- L TD in the following formula (2) is the length of the test piece in the MD direction after heat shrinking. It is.
- the wet heat shrinkage rate was measured using two test pieces for each heat-shrinkable film of each example, comparative example, and reference example, and the average value was used.
- Wet heat shrinkage rate (%) ⁇ (100-L MD )/100 ⁇ x 100 (1)
- Wet heat shrinkage rate (%) ⁇ (100-L TD )/100 ⁇ x 100 (2)
- the heat-shrinkable films of Examples 1-13, Comparative Examples 1-2, and Reference Example were cut into samples of 100 mm MD ⁇ 100 mm TD to obtain test pieces.
- the obtained test piece was measured by a method according to JIS P8134 using a film impact tester manufactured by Toyo Seiki Seisakusho. Specifically, a test piece is fixed on a table. Next, by removing the hook that fixes the arm of the film impact tester, the fan-shaped arm rotates around its axis, and the impact head attached to the tip of the arm breaks through the test piece. The impact strength is quantified as the energy required when the impact head breaks through the test piece. The impact strength is measured 5 times and the average value is obtained.
- Young's modulus> The heat-shrinkable films of Examples 1 to 13, Comparative Examples 1 to 2, and Reference Example were cut into samples of MD 250 mm ⁇ TD 5 mm to obtain test pieces. The obtained test piece was measured by a method based on ASTM D882 using Strograph VE-1D manufactured by Toyo Seiki Seisakusho. The Young's modulus was measured using four test pieces for each example, comparative example, and reference example, and the average value was calculated.
- Table 3 is a table showing test results of Examples 1 to 6, Comparative Example 1 and Reference Example.
- Table 3 is a table showing test results of Examples 1 to 6, Comparative Example 1 and Reference Example.
- the heat-shrinkable films of Examples 1 to 5 almost the same results as those of the heat-shrinkable films of Reference Examples were obtained for each measurement item.
- the heat-shrinkable film of Example 6 has a haze slightly higher than that of the heat-shrinkable film of Reference Example, and a glossiness slightly lower than that of the heat-shrinkable film of Reference Example. , substantially the same results as those of the heat-shrinkable film of Reference Example were obtained.
- the surface of the core layer containing the recycled raw material is covered with a surface layer composed substantially only of virgin raw material, and the heat-shrinkable films of Examples 5 and 6 are This is probably because the surface of the core layer is covered with the surface layer having a low ratio RY, and thus has physical properties close to those of the heat-shrinkable film of the reference example.
- the heat-shrinkable film of the comparative example had higher haze among the measurement items than the heat-shrinkable film of the reference example and lower glossiness than the heat-shrinkable film of the reference example. This is probably because the heat-shrinkable film of the comparative example had a lower glossiness because the core layer contained a recycled raw material different from the virgin raw material.
- Table 4 is a table showing test results of Examples 7 to 13, Comparative Example 2 and Reference Example.
- the heat-shrinkable films of Examples 7 and 13 were almost the same as the heat-shrinkable films of Reference Examples, and exhibited good properties despite containing recycled raw materials. From the results of Examples 7 and 13, it was confirmed that the virgin raw material for the surface layer can be either a recycled raw material derived from chemical recycling or a virgin raw material derived from petroleum.
- the heat-shrinkable films of Examples 8, 10 and 12 tended to be higher than the heat-shrinkable films of Reference Examples in terms of haze, compressive strength and Young's modulus, but within a practically acceptable range. was confirmed.
- the haze was higher than that of the heat-shrinkable film of Reference Example, but the other physical properties were almost the same as those of the heat-shrinkable film of Reference Example, and were within a practically acceptable range. was confirmed.
- the heat-shrinkable film of Example 11 compared with the heat-shrinkable film of Reference Example, the haze, compressive strength, and Young's modulus were increased, and the heat-shrinkability was decreased. It was confirmed that it can be used as a low heat shrink film. The higher the impact strength, compressive strength and Young's modulus, the higher the strength of the heat-shrinkable film.
- each of the above embodiments is an illustration of the form that the heat-shrinkable film of the present invention can take, and is not intended to limit the form.
- the heat-shrinkable film relating to the present invention can take forms different from those exemplified in each embodiment.
- One example is a form in which a part of the configuration of each embodiment is replaced, changed, or omitted, or a form in which a new configuration is added to each embodiment.
- the first recycled raw material for the core layer 20 was the same raw material as the virgin raw material for the core layer 20, but the first recycled raw material may be a raw material different from the virgin raw material for the core layer 20. good. That is, in this modification, the virgin raw material of the core layer 20, the first recycled raw material, and the second recycled raw material are different raw materials.
- the recycled raw material of the core layer 20 contains the first recycled raw material and the second recycled raw material, but the recycled raw material of the core layer 20 may be only the first recycled raw material.
- the first recycled raw material may be the same raw material as the virgin raw material of the core layer 20 or may be a raw material different from the virgin raw material of the core layer 20 .
- the core layer 20X substantially contains only virgin raw materials, but the core layer 20X may contain recycled raw materials as in the first embodiment.
- the third recycled raw material for the surface layer 30X is the same raw material as the virgin raw material for the surface layer 30X, but the third recycled raw material may be a raw material different from the virgin raw material for the surface layer 30X. That is, in this modification, the virgin raw material of the surface layer 30X, the third recycled raw material, and the fourth recycled raw material are different raw materials.
- the recycled raw material for the surface layer 30X includes the third recycled raw material and the fourth recycled raw material, but the recycled raw material for the surface layer 30X may be only the third recycled raw material.
- the third recycled raw material may be the same raw material as the virgin raw material of the surface layer 30X, or may be a raw material different from the virgin raw material of the surface layer 30X.
- steps S1 to S5 in the above embodiment may be changed. For example, after deinking to separate the printed layer from the packaging material, neutralization, washing, drying, etc. are performed as necessary, and then the resin layer of the packaging material from which the printed layer has been removed is separated into pieces and removed. You may gain Ink Fluff. In addition, at least one of singulation, neutralization, washing and drying may be omitted as appropriate, and may be performed twice or more as necessary. Also, the reclaimed raw material may be used in step S6 after going through a step of being pelletized instead of being in the form of fluff.
- the heat-shrinkable film 10X is manufactured by including the deinked fluff obtained in step S5 in the material of the surface layer 30X in step S6 of the above embodiment, and forming a resin film having the core layer 20X and the surface layer 30X. can do.
- the surface layer 30X is formed in step S6 using polystyrene-based resin as the third recycled raw material, polyester-based resin, and acrylic acid (methacrylic acid) ester-based resin as the fourth recycled raw material. It is molded including Further, the surface layer 30X may be formed by including a recycled raw material derived from the above-described intermediate manufacturing material in the raw material. Furthermore, the surface layer 30X and the core layer 20X may be molded using the virgin raw material described above.
- the first recycled raw material may be the polyester-based resin and the second recycled raw material may be the polystyrene-based resin.
- the third recycled raw material may be the polystyrene-based resin and the fourth recycled raw material may be the polyester-based resin.
- the virgin raw material of the surface layer 30 of the first embodiment may be a polystyrene resin.
- the proportion of the polystyrene resin in the entire thermoplastic resin is preferably 85% by weight or more, more preferably 90% by weight or more, and even more preferably 95% by weight or more.
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Abstract
Description
<1―1.熱収縮性フィルムの構成>
図1は、第1実施形態の熱収縮性フィルム10の層構成の一例を示す断面図である。本実施形態の熱収縮性フィルム10は、例えば、ペットボトル、または、金属罐等の容器に装着される熱収縮性のフィルムラベルのベースフィルムとして用いられる。熱収縮性フィルム10は、コア層20と、コア層20に積層される表層30と、を含む。本実施形態の熱収縮性フィルム10のコア層20は、バージン原料とは異なる原料の再生原料を含んで構成される。一般的に、熱収縮性フィルムにバージン原料の原料とは異なる再生原料を用いる場合、フィルム表面が荒れ、光沢度および印刷特性等が低下する傾向にある。本実施形態の熱収縮性フィルム10は、コア層20がバージン原料とは異なる原料の再生原料を含んで構成される場合であっても、フィルム表面に荒れが生じにくく、品質が高いように構成される。
コア層20は、少なくとも再生原料を含み、さらにバージン原料を含むことができる。コア層20のバージン原料は、公知の熱可塑性樹脂を適宜選択して用いることができる。コア層20のバージン原料は、例えば、ポリアミド系樹脂、ポリエステル系樹脂、ポリエチレン系樹脂、ポリビニルアルコール系樹脂、ポリプロピレン系樹脂、ポリスチレン系樹脂、環状オレフィン系樹脂等を挙げることができる。コア層20のバージン原料は、熱収縮性の観点から、ポリスチレン系樹脂、ポリエステル系樹脂、または、ポリプロピレン系樹脂が好ましい。本実施形態では、コア層20のバージン原料は、ポリスチレン系樹脂である。ポリスチレン系樹脂としては、熱収縮性を発現する観点から、例えば、スチレン-ブタジエン共重合体、スチレン-イソプレン共重合体、スチレン-イソプレン-ブタジエン共重合体、または、スチレン-アクリル系共重合体等を用いることができる。ポリエステル系樹脂としては、例えば、ジカルボン酸成分とジオール成分とを縮重合させることによって得られる樹脂を用いることができる。熱収縮性フィルム10は、コア層20のバージン原料として上記ポリスチレン系樹脂を含むことにより、低温での熱収縮特性及び熱収縮時の形状追従性のばらつきを抑制することができる。
表層30は、例えば、接着層を介してコア層20の表面の少なくとも一方に積層される。本実施形態では、表層30は、コア層20の表面の両面に積層される。表層30は、コア層20の表面の一方のみに積層されてもよい。
熱収縮性フィルム10によれば、実質的にバージン原料のみによって構成される(言い換えると、バージン原料を主成分とする)表層30によって、再生原料を含むコア層20の表面が覆われているため、光学特性等が低下しにくい。このため、コア層20にバージン原料とは異なる原料の再生原料を用いた場合であっても、熱収縮性フィルム10の品質が高い。
第2実施形態の熱収縮性フィルム10Xは、コア層20Xおよび表層30Xを備える点において、第1実施形態と異なり、その他の構成は、第1実施形態と同様である。以下では、第2実施形態の熱収縮性フィルム10Xについて、第1実施形態と異なる部分を中心に説明する。
図2は、第2実施形態の熱収縮性フィルム10Xの層構成の一例を示す断面図である。熱収縮性フィルム10Xは、コア層20X、および、コア層20Xの少なくとも一方の表面に積層される表層30Xを含む。熱収縮性フィルムの表層に再生原料が含まれる場合、フィルム表面が荒れ、光沢度および印刷特性等が低下するおそれがある。本実施形態の熱収縮性フィルム10Xは、表層30Xが再生原料を含んで構成される場合であっても、フィルム表面に荒れが生じにくく、品質が高いように構成される。
本実施形態では、コア層20Xは、実質的にバージン原料のみによって構成される(言い換えると、バージン原料を主成分とする)。コア層20Xのバージン原料は、例えば、第1実施形態の熱収縮性フィルム10のコア層20で例示した、任意の熱可塑性樹脂を用いることができる。本実施形態では、コア層20Xのバージン原料は、ポリスチレン系樹脂である。上述したように、このバージン原料は、石油由来の原料であってもよいし、環境負荷低減原料であってもよく、両者が併用されてもよい。
表層30Xは、バージン原料および再生原料を含む。表層30Xのバージン原料は、コア層20Xのバージン原料とは異なる。表層30Xのバージン原料は、第1実施形態の熱収縮性フィルム10の表層30で例示した、任意の熱可塑性樹脂を用いることができる。本実施形態では、表層30Xのバージン原料は、ポリエステル系樹脂である。上述したように、このバージン原料は、石油由来の原料であってもよいし、環境負荷低減原料であってもよく、両者が併用されてもよい。
熱収縮性フィルム10Xによれば、割合RYが低い表層30Xによって、コア層20Xの表面が覆われているため、光学特性等が低下しにくい。このため、再生原料を用いた場合であっても、熱収縮性フィルム10Xの品質が高い。
図3は、包装資材を出発原料として熱収縮性フィルム10を製造する方法の流れを示すフローチャートである。以下、図3を参照しながら、熱収縮性フィルム10の製造方法について説明する。
<4-1.全体概要>
本願発明者(ら)は、実施例の熱収縮性フィルム、比較例の熱収縮性フィルム、および、参考例の熱収縮性フィルムを製造し、熱収縮性フィルムの物性を測定する試験を実施した。表1は、実施例1~6の熱収縮性フィルム、比較例1の熱収縮性フィルム、および、参考例の熱収縮性フィルムに関する諸元を示す表であり、表2は、実施例7~13の熱収縮性フィルム、比較例2の熱収縮性フィルムに関する諸元を示す表である。なお、説明の便宜上、表2には表1と同じ参考例の熱収縮性フィルムに関する諸元も表されている。比較例1の熱収縮性フィルムは、表層を有していない。比較例2の熱収縮性フィルムは、表層及びコア層がともにケミカルリサイクルにより得られたポリエステル系樹脂のバージン原料のみによって構成される。参考例の熱収縮性フィルムは、表層およびコア層が石油由来のバージン原料のみによって構成される。実施例1~4及び7~13は、第1実施形態の熱収縮性フィルム10に関する実施例である。実施例5、6は、第2実施形態の熱収縮性フィルム10Xに関する実施例である。実施例1~13の熱収縮性フィルムは、コア層の両面に表層が積層されている。
実施例、比較例、および、参考例の熱収縮性フィルムに用いられるバージン原料の諸元は、次のとおりである。
石油由来のポリエステル系樹脂のバージン原料は、ジカルボン酸成分としてテレフタル酸に由来する成分を100モル%、ジオール成分としてエチレングリコールに由来する成分を65モル%、ジエチレングリコールに由来する成分を20モル%、および、1、4-シクロヘキサンジメタノールに由来する成分を15モル%含有する。ガラス転移温度は、70℃である。
ケミカルリサイクル由来のポリエステル系樹脂のバージン原料は、ECOTRIA R100(SKケミカルズ社製)である。このバージン原料のISO 75に基づいた0.455MPaにおける荷重たわみ温度は、72℃である。
石油由来のポリスチレン系樹脂のバージン原料は、スチレン-ブタジエン共重合体である。スチレン-ブタジエン共重合体は、スチレン含有量が81.3重量%、ブタジエン含有量が18.7重量%である。ビカット軟化温度は、80℃である。
参考例の熱収縮性フィルムの製造方法は、次のとおりである。まず、コア層および表層を構成する原料として表1に示される原料を用い、バレル温度が160~250℃の押出機に投入し、210℃の多層ダイスから3層構造のシート状に押出し、30℃の引き取りロールにて冷却固化した。次いで、予熱ゾーン105℃、延伸ゾーン89~91℃、熱固定ゾーン85℃のテンター延伸機内で延伸倍率6倍にて延伸した後、巻き取り機で巻き取ることによって、主収縮方向と直交する方向がMD(Machine Direction)、主収縮方向がTD(Transverse Direction)となる熱収縮性フィルムを得た。
実施例および比較例の再生原料の製造方法は、次のとおりである。参考例の熱収縮性フィルムの一方の面に、グラビア印刷機を用いて印刷層を積層した。また、参考例の熱収縮性フィルムの他方の面には、アクリル酸(メタクリル酸)エステル系樹脂を塗布してオーバーコート層を積層した。次に、印刷層を有する熱収縮性フィルムを粉砕機でチップ状に加工し、脱墨処理を施して脱墨フラフとし、さらに熱風で乾燥処理を行うことによって、実施例および比較例の再生原料を作製した。実施例7,8,12及び13のコア層の原料に含めた脱墨フラフは、ポリスチレン40重量%及びポリエステル60重量%で構成された。実施例9~11のコア層の原料に含めた脱墨フラフは、ポリスチレン20重量%及びポリエステル80重量%で構成された。また、実施例12のコア層の再生原料には、上記脱墨フラフに加え、参考例の熱収縮性フィルムの製造工程で発生した熱収縮フィルムの製造中間材に由来する再生原料を含めた。実施例12のコア層を構成する熱可塑性樹脂全体に対する製造中間材に由来する再生原料の割合は、70重量%であった。また、この製造中間材に由来する再生原料中のポリエステル系樹脂の割合は、30重量%であった。
実施例1~13、および、比較例1~2の熱収縮性フィルムの製造方法は次のとおりである。コア層および表層を構成する原料として表1及び表2に示される原料を用い、これらを表1及び表2に示す割合で混合することで、実施例1~13、および、比較例1~2に係るコア層および表層を構成する原料組成物を得た。この原料組成物を用いて、参考例の熱収縮性フィルムと同様の方法によって、実施例1~13、および、比較例1~2の熱収縮性フィルムを作製した。なお、オーバーコート層に由来するアクリル酸(メタクリル酸)エステル系樹脂の含有割合(各熱収縮性フィルムを構成する熱可塑性樹脂全体に対する割合)は、各熱収縮性フィルムをNMR測定することにより得られた1H-NMRスペクトルのポリメタクリル酸メチルの側鎖に由来するシグナルの面積に基づいて算出した。
本願発明者(ら)は、実施例1~13、比較例1~2、および、参考例の熱収縮性フィルムについて、以下の項目を測定する試験を実施した。
実施例1~13、比較例1~2、および、参考例で得られた熱収縮性フィルムを、MD100mm×TD100mmの大きさのサンプルにカットし、試験片を得た。得られた試験片を、70℃、80℃、90℃の温水、および、沸騰水(100℃)に10秒間浸漬させた後、試験片を取り出し、15℃の水に5秒間浸漬し、次式(1)に従いMD方向の湿熱収縮率を求め、次式(2)に従いTD方向の湿熱収縮率を求めた。なお、次式(1)中のLMDは、熱収縮後の試験片のMD方向の長さであり、次式(2)中のLTDは、熱収縮後の試験片のMD方向の長さである。なお、湿熱収縮率は、各実施例、比較例、および、参考例の熱収縮性フィルムにつき、2つの試験片を用いて測定し、その平均値を用いた。
湿熱収縮率(%)={(100-LMD)/100}×100・・・(1)
湿熱収縮率(%)={(100-LTD)/100}×100・・・(2)
JIS Z7136に準ずる方法により、ヘイズメーター(日本電色工業社製、NDH5000)を用いて、実施例1~13、比較例1~2、および、参考例の熱収縮性フィルムに対しヘイズを測定した。なお、ヘイズについては、各実施例、各比較例、および、参考例につき、4つの試験片を用いて測定し、その平均値を算出した。
JIS Z8741に準ずる方法により、日本電色工業社製のVG-2000型を用いて、各実施例、各比較例、および、参考例の熱収縮性フィルムに対し、入射角45°における光沢度を測定した。
実施例1~13、比較例1~2、および、参考例の熱収縮性フィルムを、MD100mm×TD100mmの大きさのサンプルにカットし、試験片を得た。得られた試験片を、(株)東洋精機製作所製のフィルムインパクトテスターを用いてJIS P8134に準ずる方法により、測定した。具体的には、台の上に、試験片を固定する。次に、フィルムインパクトテスターのアームを固定しているフックを取り外すことで、軸を中心に扇形のアームが回転し、アームの先端に取り付けられた衝撃ヘッドが試験片を突き破る。衝撃強度は、衝撃ヘッドが試験片を突き破る時に必要なエネルギーを衝撃強度として数値化する。衝撃強度は、5回測定を行い、平均値を求める。
実施例1~13、比較例1~2、および、参考例の熱収縮性フィルムについて、JIS P8126に準拠した方法で圧縮強度を測定した。具体的には以下の方法を用いた。得られた熱収縮性フィルムを長さ152.4mm、幅12.7mmの短冊状にカットし、予め作製した支持具に円筒状にセットした後、支持具をリングクラッシュテスタ(東洋精機製作所社製、型式D)の架台に乗せ、測定を行った。測定は縦方向(フィルムの流れ方向)の圧縮強度のみで行い、n=8としその平均値を値とした。
実施例1~13、比較例1~2、および、参考例の熱収縮性フィルムを、MD250mm×TD5mmの大きさのサンプルにカットし、試験片を得た。得られた試験片を、東洋精機製作所社製ストログラフVE-1Dを用いてASTM D882に準拠した方法で測定した。なお、ヤング率は、各実施例、比較例、および、参考例につき、4つの試験片を用いて測定し、その平均値を算出した。
実施例1~6、比較例1、および、参考例の熱収縮性フィルムを、東京精密株式会社製サーフコム570Aにセットし、ISO13565-1規格に準拠して、Ra(算術平均粗さ),Rmax(最大高さ粗さ),Rz(十点平均粗さ)を測定した。測定条件は次のとおりである。
・カットオフ:0.8mm
・測定端子の駆動速度:0.3mm/秒
・測定長さ:20.0mm
・測定倍率:縦倍率×10,000、横倍率×5
実施例7~13、比較例1及び参考例の熱収縮性フィルムの任意の箇所から、MD100mm×TD100mmのサンプルをそれぞれ3枚ずつ切り出した。各サンプルを一定温度に調整した低温恒温器(IL-82 ヤマト科学社製)に7日間静置した後、各サンプルのMD方向の長さLMD(mm)及びTD方向の長さLTD(mm)をそれぞれ計測した。温度条件は、30℃及び40℃とした。各サンプルについて、上記の式(1)及び(2)に従い、MD方向及びTD方向の自然収縮率(%)の平均値を算出した。
表3は、実施例1~6、比較例1及び参考例の試験結果を示す表である。実施例1~5の熱収縮性フィルムは、各測定項目について、参考例の熱収縮性フィルムと概ね同様の結果が得られた。また、実施例6の熱収縮性フィルムは、ヘイズが参考例の熱収縮性フィルムよりも若干高く、かつ、光沢度が参考例の熱収縮性フィルムよりも若干低いものの、他の測定項目については、参考例の熱収縮性フィルムと概ね同様の結果が得られた。実施例1~4の熱収縮性フィルムは、実質的にバージン原料のみによって構成される表層によって、再生原料を含むコア層の表面が覆われており、実施例5、6の熱収縮性フィルムは、割合RYが低い表層によって、コア層の表面が覆われているため、参考例の熱収縮性フィルムの物性に近い物性を有しているためと考えられる。一方、比較例の熱収縮性フィルムは、各測定項目のうちのヘイズが参考例の熱収縮性フィルムよりも高く、光沢度が参考例の熱収縮性フィルムよりも低かった。比較例の熱収縮性フィルムは、コア層がバージン原料とは異なる原料の再生原料を含むため、光沢度が低下したためであると考えられる。
上記各実施形態は本発明に関する熱収縮性フィルムが取り得る形態の例示であり、その形態を制限することを意図していない。本発明に関する熱収縮性フィルムは、各実施形態に例示された形態とは異なる形態を取り得る。その一例は、各実施形態の構成の一部を置換、変更、もしくは、省略した形態、または、各実施形態に新たな構成を付加した形態である。以下に各実施形態の変形例の幾つかの例を示す。
第1実施形態では、コア層20の第1再生原料は、コア層20のバージン原料と同じ原料であったが、第1再生原料は、コア層20のバージン原料とは異なる原料であってもよい。すなわち、この変形例では、コア層20のバージン原料と、第1再生原料と、第2再生原料とは、異なる原料である。
第1実施形態では、コア層20の再生原料は、第1再生原料および第2再生原料を含んでいたが、コア層20の再生原料は、第1再生原料のみであってもよい。この変形例では、第1再生原料は、コア層20のバージン原料と同じ原料であってもよく、コア層20のバージン原料とは異なる原料であってもよい。
第2実施形態では、コア層20Xは、実質的にバージン原料のみを含んでいたが、コア層20Xは、第1実施形態と同様に、再生原料を含んでいてもよい。
第2実施形態では、表層30Xの第3再生原料は、表層30Xのバージン原料と同じ原料であったが、第3再生原料は、表層30Xのバージン原料とは異なる原料であってもよい。すなわち、この変形例では、表層30Xのバージン原料と、第3再生原料と、第4再生原料とは、異なる原料である。
第2実施形態では、表層30Xの再生原料は、第3再生原料および第4再生原料を含んでいたが、表層30Xの再生原料は、第3再生原料のみであってもよい。この変形例では、第3再生原料は、表層30Xのバージン原料と同じ原料であってもよく、表層30Xのバージン原料とは異なる原料であってもよい。
上記実施形態のステップS1~ステップS5の順序は、変更されてもよい。例えば、包装資材から印刷層を分離する脱墨処理を行った後、必要に応じて中和、洗浄および乾燥等を行い、その後印刷層が除去された包装資材の樹脂層を個片化し、脱墨フラフを得てもよい。また、個片化、中和、洗浄および乾燥のうち少なくとも1つは適宜省略されてもよいし、必要に応じて2回以上行われてもよい。また、再生原料は、フラフの形態ではなく、ペレット化される工程を経た後に、ステップS6で用いられてもよい。
熱収縮性フィルム10Xは、上記実施形態のステップS6において、ステップS5で得られた脱墨フラフを表層30Xの原料に含め、コア層20Xと表層30Xとを備える樹脂フィルムの成形を行うことにより製造することができる。上記実施形態のコア層20と同様、表層30Xは、ステップS6において、第3再生原料としてのポリスチレン系樹脂、第4再生原料としてのポリエステル系樹脂、アクリル酸(メタクリル酸)エステル系樹脂を原料に含めて成形される。また、表層30Xは、上述した製造中間材に由来する再生原料を原料に含めて成形されてもよい。さらに、表層30X及びコア層20Xは、上述したバージン原料を原料に含めて成形されてもよい。
第1再生原料及び第2再生原料の組み合わせがポリスチレン系樹脂及びポリエステル系樹脂である場合、第1再生原料がポリエステル系樹脂であり、第2再生原料がポリスチレン系樹脂であってもよい。また、第3再生原料及び第4再生原料の組み合わせがポリスチレン系樹脂及びポリエステル系樹脂である場合、第3再生原料がポリスチレン系樹脂であり、第4再生原料がポリエステル系樹脂であってもよい。また、第1実施形態の表層30のバージン原料は、ポリスチレン系樹脂であってもよい。この場合、熱可塑性樹脂全体における上記ポリスチレン系樹脂の割合は、85重量%以上であることが好ましく、90重量%以上であることがより好ましく、95重量%以上であることがさらに好ましい。上記ポリスチレン系樹脂の割合を上記下限以上とすることで、熱収縮性フィルム10の自然収縮率を低く抑制でき、耐熱性及び耐薬品性を向上させることができる。
20、20X:コア層
30、30X:表層
Claims (5)
- 熱可塑性樹脂を主成分とする樹脂層と、印刷層とを有するフィルムラベルを複数含む包装資材を準備することと、
前記樹脂層から、第1再生原料と、前記第1再生原料とは異なる第2再生原料とを回収することと、
前記第1再生原料及び前記第2再生原料を少なくとも含むコア層と、前記コア層に積層され、熱可塑性樹脂を含む表層とを少なくとも備える樹脂フィルムを成形することと
を含み、
前記第1再生原料及び前記第2再生原料を回収することは、
前記包装資材及び前記印刷層が除去された前記樹脂層の少なくとも一方を個片化することと、
前記包装資材及び前記包装資材の個片の少なくとも一方から前記印刷層を分離して、前記印刷層が除去された前記樹脂層及び前記印刷層が除去された前記樹脂層の個片の少なくとも一方を得ることと、
を含み、
前記第1再生原料及び前記第2再生原料のうち一方はポリエステル系樹脂であり、他方はポリスチレン系樹脂である、
熱収縮性フィルムの製造方法。 - 前記樹脂フィルムを成形することは、熱可塑性樹脂のバージン原料を主成分とする前記表層を成形することを含み、
前記熱可塑性樹脂は、ポリエステル系樹脂またはポリスチレン系樹脂である、
請求項1に記載の熱収縮性フィルムの製造方法。 - 前記包装資材以外の製造中間材からポリスチレン系樹脂を回収すること
をさらに含み、
前記樹脂フィルムを成形することは、前記回収されたポリスチレン系樹脂を含む前記コア層を成形することを含む、
請求項1に記載の熱収縮性フィルムの製造方法。 - 前記包装資材以外の製造中間材からポリスチレン系樹脂を回収すること
をさらに含み、
前記樹脂フィルムを成形することは、前記回収されたポリスチレン系樹脂を含む前記コア層を成形することを含む、
請求項2に記載の熱収縮性フィルムの製造方法。 - 熱可塑性樹脂を主成分とする樹脂層と、印刷層とを有するフィルムラベルを複数含む包装資材を出発原料として得られる第1再生原料と、前記第1再生原料とは異なる第2再生原料と、アクリル酸エステル系樹脂とを少なくとも含むコア層と、
前記コア層の少なくとも一方の表面に積層され、熱可塑性樹脂を含む表層と
を備え、
前記第1再生原料及び前記第2再生原料のうち一方はポリエステル系樹脂であり、他方はポリスチレン系樹脂である、
熱収縮性フィルム。
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- 2022-08-03 TW TW111129222A patent/TW202313806A/zh unknown
- 2022-08-03 JP JP2023540389A patent/JPWO2023013690A1/ja active Pending
- 2022-08-03 JP JP2023540388A patent/JPWO2023013689A1/ja active Pending
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US20240326390A1 (en) | 2024-10-03 |
JPWO2023013690A1 (ja) | 2023-02-09 |
US20240326389A1 (en) | 2024-10-03 |
JPWO2023013689A1 (ja) | 2023-02-09 |
CN117715751A (zh) | 2024-03-15 |
TW202313806A (zh) | 2023-04-01 |
TW202313805A (zh) | 2023-04-01 |
CN117729998A (zh) | 2024-03-19 |
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