WO2017094729A1 - 食品包装用フィルム及び化粧箱付食品包装用小巻フィルム - Google Patents

食品包装用フィルム及び化粧箱付食品包装用小巻フィルム Download PDF

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Publication number
WO2017094729A1
WO2017094729A1 PCT/JP2016/085434 JP2016085434W WO2017094729A1 WO 2017094729 A1 WO2017094729 A1 WO 2017094729A1 JP 2016085434 W JP2016085434 W JP 2016085434W WO 2017094729 A1 WO2017094729 A1 WO 2017094729A1
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Prior art keywords
film
food packaging
mass
resin
food
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PCT/JP2016/085434
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English (en)
French (fr)
Inventor
裕幸 宮田
Original Assignee
日立化成株式会社
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Publication date
Application filed by 日立化成株式会社 filed Critical 日立化成株式会社
Priority to US15/779,882 priority Critical patent/US20180312313A1/en
Priority to CN201680069821.8A priority patent/CN108291040B/zh
Priority to SG11201804531RA priority patent/SG11201804531RA/en
Priority to EP16870666.1A priority patent/EP3385310B1/en
Priority to JP2017554115A priority patent/JP7089367B2/ja
Priority to KR1020187018230A priority patent/KR20180088691A/ko
Publication of WO2017094729A1 publication Critical patent/WO2017094729A1/ja

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    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/175—Plastic
    • B65H2701/1752—Polymer film
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1944—Wrapping or packing material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/08—Homopolymers or copolymers of vinylidene chloride

Definitions

  • the present invention relates to a food packaging film and a food packaging small roll film with a decorative box.
  • Patent Document 1 discloses that assimilation between food and container to be packaged and a film is prevented, the end face of the film can be easily discriminated, and the films on the end face, or the food, container and the film are more closely attached than necessary.
  • a food packaging film is disclosed in which embossing is applied to a predetermined portion of a film for the purpose of preventing the above.
  • An object of the present invention is to provide a food packaging film and a food packaging small roll film with a cosmetic box that are identifiable even when mixed in food and are excellent in film-forming property and productivity.
  • the present invention provides a food packaging film containing a thermoplastic resin, a blue colorant, and a white colorant.
  • the content of the blue colorant is preferably 0.45 to 2.2% by mass based on the total amount of the film.
  • the content of the white colorant is preferably 0.15 to 0.55% by mass based on the total amount of the film.
  • the thermoplastic resin may be at least one selected from the group consisting of polyvinyl chloride resins, polyvinylidene chloride resins, polyolefin resins, polyester resins, and polyamide resins.
  • the film may contain 70% by mass or more of at least one selected from the group consisting of a polyvinyl chloride resin, a polyvinylidene chloride resin and a polyolefin resin as a thermoplastic resin based on the total amount of the film.
  • the film may be a film that allows the packaged food to be visually recognized from the outside.
  • the total light transmittance of the film may be 70% or more.
  • the present invention also includes the above food packaging film, a core material in which the food packaging film is wound, and a cosmetic box in which the food packaging film and the core material are stored.
  • a food packaging small roll film with a decorative box provided with a blade for cutting the packaging film.
  • the film according to the present embodiment contains a thermoplastic resin, a blue colorant, and a white colorant, and is suitably used as a food packaging film.
  • the thermoplastic resin is polyvinyl chloride resin such as polyvinyl chloride; polyvinylidene chloride resin such as polyvinylidene chloride; polyolefin resin such as saponified polyethylene, polypropylene, ethylene-vinyl acetate copolymer; butadiene-styrene copolymer Polystyrene resins such as polymers, acrylonitrile-styrene copolymers, polystyrene, styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, styrene-acrylic acid copolymers; polyethylene terephthalate, polyethylene naphthalate, Polyester resins such as polybutylene terephthalate; polyamide resins such as 6-nylon, 6,6-nylon, and 12-nylon;
  • the thermoplastic resin is preferably a polyvinyl chloride resin
  • polyvinyl chloride resin a polyvinyl chloride resin having an average polymerization degree of 700 to 1300 is preferable from the viewpoint of excellent film moldability, heat resistance and fluidity.
  • the average degree of polymerization in this specification means an average degree of polymerization measured according to JIS K6720-2.
  • the polyvinyl chloride resin may be a vinyl chloride homopolymer (polyvinyl chloride resin) from the viewpoint of excellent mechanical properties, and for the purpose of imparting other properties, other vinyl chloride and other copolymerizable with this may be used. It may be a copolymer with a monomer.
  • the copolymer may be a graft copolymer, a block copolymer or a random copolymer.
  • Examples of other monomers include olefins such as ethylene, propylene, and polybutene; vinyl esters of saturated acids such as vinyl acetate and vinyl laurate; alkyl esters of unsaturated acids such as methyl acrylate and methyl methacrylate; lauryl Alkyl vinyl ethers such as vinyl ether; maleic acid, acrylonitrile, styrene, methylstyrene, vinylidene fluoride; and the like.
  • the polyvinyl chloride resin is a copolymer
  • the content of vinyl chloride units in the copolymer may be 10% by mass or more based on the total amount of monomer units, and is preferably 30 from the viewpoint of excellent mechanical properties. It is at least 50% by mass, more preferably at least 50% by mass.
  • the upper limit of the content of vinyl chloride units in the copolymer is not particularly limited, and may be 99% by mass or less based on the total amount of monomer units, for example.
  • the polyvinyl chloride resin may be, for example, a polymer blend with a three-dimensional polymer of acrylonitrile-butadiene-styrene, a post-treatment product with alcohol, or a post-treatment product with a chlorine-containing compound.
  • the content of the vinyl chloride unit in the polyvinyl chloride resin may be 10% by mass or more based on the total amount of the resin.
  • the polyvinylidene chloride-based resin may be a vinylidene chloride homopolymer (polyvinylidene chloride resin), for example, a copolymer containing, as monomer units, vinylidene chloride and other monomers copolymerizable with vinylidene chloride. It's okay.
  • Other monomers include vinyl chloride, acrylic acid esters of acrylic acid and alcohols having 1 to 8 carbon atoms, methacrylic acid esters of methacrylic acid and alcohols having 1 to 8 carbon atoms, vinyl esters of aliphatic carboxylic acids, unsaturated Aliphatic carboxylic acids, olefins, vinyl ethers and the like may be used.
  • the copolymer of vinylidene chloride and vinyl chloride belongs to the polyvinylidene chloride resin.
  • the content of the vinylidene chloride unit in the polyvinylidene chloride resin is, for example, 60% by mass or more, 70% by mass or more, or 80% by mass or more based on the total amount of the monomer units from the viewpoint of film moldability and heat resistance. It's okay.
  • the upper limit of the content of the vinylidene chloride unit in the polyvinylidene chloride resin is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of monomer units.
  • the content of vinylidene chloride units can be measured with a nuclear magnetic resonance (NMR) apparatus.
  • the weight average molecular weight of the polyvinylidene chloride resin may be, for example, 40,000 to 180,000, 60000 to 160000, or 80000 to 140000.
  • the weight average molecular weight of the polyvinylidene chloride resin can be measured by GPC method using polystyrene having a known molecular weight as a standard substance.
  • the conditions of the GPC method used for measuring the weight average molecular weight of the polyvinylidene chloride resin are as follows.
  • a gel chromatograph Alliance GPC2000 manufactured by Waters Co. is used as a measuring device.
  • a sample obtained by dissolving a polyvinylidene chloride resin in tetrahydrofuran so as to be 0.5% by weight is used as a sample.
  • Mobile phase Tetrahydrofuran Detector: Differential refractometer Flow rate: 1.0 mL / min Column temperature: 20 ° C Injection volume: 500 ⁇ L
  • the film may further contain a plasticizer.
  • the plasticizer include epoxidized linseed oil, epoxidized soybean oil, epoxidized oil such as epoxidized fatty acid alkyl ester, adipic acid ester having a linear or branched alkyl group having 6 to 10 carbon atoms, tributyl acetylcitrate, Hydroxypolycarboxylic acid esters such as acetylated triethyl, fatty acid dibasic acid esters such as dinormalbutyl sebacate, glycol esters such as pentaerythritol ester and diethylene glycol benzoate, phosphate esters such as triphenyl phosphate and tricresyl phosphate Glycerin diacetomonolaurate, chlorinated paraffin, polyester plasticizer and the like.
  • plasticizers are used alone or in combination of two or more.
  • the content of the plasticizer is appropriately adjusted within a range of, for example, 20 to 50 parts by mass with respect to 100 parts by mass of the polyvinyl chloride resin, depending on the type of food to be packaged, the packaging form, the packaging method, and the like. .
  • polyolefin resins examples include polyethylene resins, and polyethylene resins include low density polyethylene, linear low density polyethylene, linear ultra low density polyethylene, medium density polyethylene, high density polyethylene, and ethylene as monomer units. It may be a copolymer. Specifically, the polyethylene resin has 3 to 10 carbon atoms such as ethylene and propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, and the like.
  • ⁇ -olefins vinyl esters such as vinyl acetate and vinyl propionate, unsaturated carboxylic acid esters such as methyl acrylate, ethyl acrylate, methyl methacrylate and ethyl methacrylate, unsaturated compounds such as conjugated dienes and non-conjugated dienes; It may be a copolymer with one or more selected from the above.
  • the content of ethylene units in the polyethylene resin may be 50% by mass or more based on the total amount of monomer units.
  • the content of the thermoplastic resin may be 70% by mass or more or 75% by mass or more and 85% by mass or less or 80% by mass or less based on the total amount of the film from the viewpoint of excellent productivity.
  • the content of polyvinyl chloride resin, polyvinylidene chloride resin or polyolefin resin is preferably in the above range, and the content of polyvinyl chloride resin, polyvinylidene chloride resin or polyethylene resin is in the above range. It is more preferable that
  • the blue colorant is, for example, a colorant having a maximum absorption wavelength in the visible light region (380 to 750 nm) at 600 to 750 nm.
  • the absorbance of the blue colorant at the maximum absorption wavelength in the visible light region is preferably at least 2 times, more preferably at least 3 times the absorbance at 470 nm.
  • the blue colorant may be copper phthalocyanine (copper phthalocyanine blue), iron (III) hexacyanoferrate (ii), a cobaltous oxide / aluminum oxide mixture, indigo, ultramarine, or the like.
  • the content of the blue colorant is preferably 0.45% by mass or more, more preferably 0.6% by mass or more, still more preferably 0.75% by mass or more, based on the total amount of the film, from the viewpoint of further excellent discrimination. Especially preferably, it is 1.0 mass% or more.
  • the content of the blue colorant is preferably 2.2% by mass or less, more preferably 2.0% by mass or less, and further preferably 1.9%, based on the total amount of the film, from the viewpoint of further improving the film forming property and productivity. It is not more than mass%, particularly preferably not more than 1.8 mass%.
  • the content of the blue colorant is preferably 0.45 to 2.2% by mass, 0.45 to 2.0% on the basis of the total amount of the film, from the viewpoint that it is further excellent in all of distinguishability, film forming property and productivity.
  • % By mass, 0.45 to 1.9% by mass, 0.45 to 1.8% by mass, 0.6 to 2.2% by mass, 0.6 to 2.0% by mass, 0.6 to 1.9% Mass%, 0.6-1.8 mass%, 0.75-2.2 mass%, 0.75-2.0 mass%, 0.75-1.9 mass%, 0.75-1.8 %
  • the content of the blue colorant is preferably greater than the content of the white colorant described below.
  • the white colorant is, for example, a colorant having an absorbance of 0.3 or less (scatters visible light) in the entire visible light region (380 nm to 750 nm).
  • the white colorant may be titanium oxide, titanium oxide-barium sulfate, titanium oxide-magnesium silicate, titanium oxide-calcium sulfate, or zinc oxide.
  • the content of the white colorant is preferably 0.15% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.25% by mass or more, based on the total amount of the film, from the viewpoint of further excellent discrimination. Especially preferably, it is 0.3 mass% or more.
  • the content of the white colorant is preferably 0.55% by mass or less, more preferably 0.5% by mass or less, and still more preferably 0.45 on the basis of the total amount of the film from the viewpoint of further improving the film forming property and productivity. It is not more than mass%, particularly preferably not more than 0.4 mass%.
  • the content of the white colorant is preferably 0.15 to 0.55% by mass, 0.15 to 0.5% on the basis of the total amount of the film, from the viewpoint that it is further excellent in all of distinguishability, film forming property, and productivity.
  • the film may further contain other components in addition to the thermoplastic resin, the blue colorant and the white colorant.
  • Other components include antifogging agents, heat stabilizers, light stabilizers, lubricants, fillers, plate-out prevention agents, antioxidants, mold release agents, viscosity reducing agents, surfactants, blue colorants and white colorants.
  • Coloring agents other than the agents, fluorescent agents, surface treatment agents, crosslinking agents, processing aids, pressure-sensitive adhesives, antistatic agents, ultraviolet absorbers, antiblocking agents and the like can be mentioned.
  • the film may be composed of one layer containing a thermoplastic resin, a blue colorant and a white colorant, or may be composed of a plurality of layers.
  • the film may include, for example, a first surface layer, an intermediate layer, and a second surface layer in this order.
  • the intermediate layer may contain a blue colorant and a white colorant.
  • the film may further include, for example, an adhesive layer containing an acid-modified polyolefin resin or the like in order to improve the adhesion between the layers, and contains a polyamide-based resin in order to improve the heat resistance of the film.
  • a heat-resistant layer may be further provided.
  • the thermoplastic resin is a polyvinyl chloride resin
  • the film is preferably composed of one layer containing a thermoplastic resin (polyvinyl chloride resin), a blue colorant and a polyglycerol fatty acid ester.
  • the thickness of the film is preferably 5 ⁇ m or more, more preferably 6 ⁇ m or more from the viewpoint of efficiently blocking food from the outside air, and from the viewpoint of excellent handleability, the thickness is preferably 25 ⁇ m or less, more preferably 12 ⁇ m. It may be the following.
  • the total light transmittance of the film is preferably 70% or more, more preferably 75% or more, from the viewpoint of excellent food visibility.
  • the total light transmittance of the film is preferably 85% or less, more preferably 80% or less, and still more preferably 79% or less, from the viewpoint of further excellent discrimination for food.
  • the total light transmittance of the film is calculated according to the following formula based on the total transmitted light amount measured according to JIS K7361-1.
  • Total light transmittance (%) (total transmitted light amount) / (incident light amount) ⁇ 100
  • a composition containing a thermoplastic resin, a blue colorant, and a white colorant is mixed by a mixer such as a V-type blender, a ribbon blender, a Henschel mixer, and a super mixer, and further mixed rolls and banbury as necessary.
  • the composition is obtained by kneading with a kneader such as a mixer or a kneader, and then manufactured by, for example, extrusion molding.
  • the composition is supplied to a hopper of an extruder, and a target film is obtained by an inflation method, a T-die method, or the like.
  • the film is wound up while being produced, and the wound film is further rewinded (made in a small roll shape) for each desired length such as 20 m, 50 m, etc., and packed in a cosmetic box. It is said. That is, the film in the present embodiment may be in the form of a food packaging small roll film, or may be in the form of a food packaging small roll film with a decorative box.
  • a food packaging small roll film 1 with a cosmetic box includes a food packaging film 2, a core material 3 in which the food packaging film 2 is small wound, and a food packaging film. 2 and a cosmetic box 4 in which the core material 3 is housed, and the cosmetic box 4 may be provided with a blade portion 5 for cutting the food packaging film 2.
  • the material of the core material 3 and the decorative box 4 is not particularly limited. From the viewpoint of easily recognizing the color of the film 2 from the outside, at least a part of the decorative box 4 is preferably transparent or has a hole that does not impair the function of the box.
  • the film is composed of a plurality of layers
  • the film is obtained by putting the constituent materials of each layer into separate extruders, melt-extruding them, and co-extruding each layer by inflation, T-die method or the like and laminating them.
  • the film described above is a film that allows the packaged food to be visually recognized from the outside.
  • the film is a film (stretch film) having stretchability (also referred to as stretchability).
  • the film according to the present embodiment may be a food sorting film used for sorting food. If the film which concerns on this embodiment is used, two or more types of foodstuffs can be classified into at least two groups according to the kind of foodstuff. That is, for example, the first food is wrapped with the film according to the present embodiment and sorted into the first group, while the second food is a film having a color different from that of the film according to the present embodiment or colorless. It can be packaged with film and sorted into a second group.
  • first allergic substance when there is a first food containing a first allergic substance and a second food containing a second allergic substance, the first allergic substance has allergic symptoms.
  • First food is sorted into a first group, which is a food group provided to a person who is not present, while a food group is provided to a person who does not have an allergic symptom against a second allergic substance. Sort the second food into two groups. In the above example, it is possible to suppress the occurrence of an accident in which a person who has allergic symptoms with respect to the first or second allergic substance is provided with the allergic substance.
  • surface is a value of solid content conversion, and represents the mass%.
  • Examples 7 to 15 and Comparative Examples 5 to 6> A resin composition is prepared using the following thermoplastic resin, blue colorant, white colorant and various additives shown in Tables 3 and 4, and each resin composition is extruded with an inflation film forming apparatus to form a film having a thickness of 9 ⁇ m. Produced.
  • surface is a value of solid content conversion, and represents the mass%.
  • Thermoplastic resin a1 Polyvinyl chloride resin (manufactured by Taiyo PVC Co., Ltd., “TH-1000”, average degree of polymerization: 1000)
  • Thermoplastic resin a2 Polyethylene resin (manufactured by Prime Polymer Co., Ltd., “Neozex 0234N”)
  • White colorant c1 Titanium oxide (manufactured by Sakai Chemical Industry Co., Ltd., “FTR-700”)
  • Additive d1 Dioctyl adipate (manufacture
  • Total light transmittance (%) (total transmitted light amount) / (incident light amount) ⁇ 100
  • evaluation of distinguishability A piece of 3 mm to 10 mm square was produced from the obtained film, and it was visually observed whether the piece of the film could be identified when the film was mixed into food.
  • the evaluation criteria are as follows. In addition, if evaluation is A or B, it can be said that it is excellent in distinguishability. A: It is very easy to identify the film for food. B: It is easy to identify the film for food. C: It is difficult to distinguish a film from food.
  • SYMBOLS 1 Small roll film for food packaging with a cosmetic box, 2 ... Film for food packaging, 3 ... Core material, 4 ... Cosmetic box, 5 ... Blade part.

Abstract

本発明は、熱可塑性樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルムを提供する。

Description

食品包装用フィルム及び化粧箱付食品包装用小巻フィルム
　本発明は、食品包装用フィルム及び化粧箱付食品包装用小巻フィルムに関する。
　従来、食品包装用フィルムは、ホテル、レストラン等において業務用として、あるいは家庭において食品保存時、調理時等に幅広く使用されている。食品包装用フィルムに対しては、使用時の利便性向上のために種々の改良が行われている。例えば特許文献１には、包装される食材及び容器とフィルムとの同化を防ぐと共に、フィルムの端面を容易に判別でき、かつ該端面におけるフィルム同士、又は食材及び容器とフィルムとの必要以上の密着を防止すること等を目的として、フィルムの所定の箇所にエンボス加工が施されてなる食品包装用フィルムが開示されている。
特開２００３－６３５５５号公報
　本発明は、食品に混入した場合でも識別可能であり、かつ製膜性及び生産性に優れる食品包装用フィルム及び化粧箱付食品包装用小巻フィルムを提供することを目的とする。
　本発明は、熱可塑性樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルムを提供する。
　青色着色剤の含有量は、好ましくはフィルム全量基準で０．４５～２．２質量％である。
　白色着色剤の含有量は、好ましくはフィルム全量基準で０．１５～０．５５質量％である。
　熱可塑性樹脂は、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂及びポリアミド系樹脂からなる群より選ばれる少なくとも１種であってよい。
　フィルムは、熱可塑性樹脂として、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂及びポリオレフィン系樹脂からなる群より選ばれる少なくとも１種をフィルム全量基準で７０質量％以上含有してよい。
　フィルムは、包装した食品を外部から視認可能なフィルムであってよい。
　フィルムの全光線透過率は、７０％以上であってよい。
　また、本発明は、上記の食品包装用フィルムと、食品包装用フィルムが小巻された芯材と、食品包装用フィルム及び芯材が収納された化粧箱とを備え、化粧箱には、食品包装用フィルムを切断するための刃部が設けられている、化粧箱付食品包装用小巻フィルムを提供する。
　本発明によれば、食品に混入した場合でも識別可能であり、かつ製膜性及び生産性に優れる食品包装用フィルム及び化粧箱付食品包装用小巻フィルムを提供することができる。
化粧箱付食品包装用小巻フィルムを示す模式図である。
　本実施形態に係るフィルムは、熱可塑性樹脂と、青色着色剤と、白色着色剤と、を含有し、食品包装用フィルムとして好適に用いられる。
　熱可塑性樹脂は、ポリ塩化ビニル等のポリ塩化ビニル系樹脂；ポリ塩化ビニリデン等のポリ塩化ビニリデン系樹脂；ポリエチレン、ポリプロピレン、エチレン－酢酸ビニル共重合体ケン化物等のポリオレフィン系樹脂；ブタジエン－スチレン共重合体、アクリロニトリル－スチレン共重合体、ポリスチレン、スチレン－ブタジエン－スチレン共重合体、スチレン－イソプレン－スチレン共重合体、スチレン－アクリル酸共重合体等のポリスチレン系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂；６－ナイロン、６，６－ナイロン、１２－ナイロン等のポリアミド系樹脂；などであってよい。熱可塑性樹脂は、取扱い性に優れる観点から、好ましくは、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂又はポリオレフィン系樹脂であり、より好ましくは、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂又はポリエチレン系樹脂である。
　ポリ塩化ビニル系樹脂としては、フィルムの成形性、耐熱性及び流動性に優れる観点から、平均重合度７００～１３００のポリ塩化ビニル系樹脂が好ましい。本明細書における平均重合度は、ＪＩＳ　Ｋ６７２０－２に準じて測定された平均重合度を意味する。
　ポリ塩化ビニル系樹脂は、機械特性に優れる観点から、塩化ビニルホモポリマー（ポリ塩化ビニル樹脂）であってもよく、他の特性を付与する目的から、塩化ビニルとこれに共重合可能なその他のモノマーとの共重合体であってもよい。共重合体は、グラフト共重合体、ブロック共重合体又はランダム共重合体であってよい。その他のモノマーの例としては、エチレン、プロピレン、ポリブテン等のオレフィン；酢酸ビニル、ラウリン酸ビニル等の飽和酸のビニルエステル；アクリル酸メチルエステル、メタクリル酸メチルエステル等の不飽和酸のアルキルエステル；ラウリルビニルエーテル等のアルキルビニルエーテル；マレイン酸、アクリロニトリル、スチレン、メチルスチレン、フッ化ビニリデン；などが挙げられる。ポリ塩化ビニル系樹脂が共重合体である場合、共重合体における塩化ビニル単位の含有量は、モノマー単位全量基準で、１０質量％以上であってよく、機械特性に優れる観点から、好ましくは３０質量％以上、より好ましくは５０質量％以上である。共重合体における塩化ビニル単位の含有量の上限は、特に限定されず、例えば、モノマー単位全量基準で９９質量％以下であってよい。
　ポリ塩化ビニル系樹脂は、例えば、アクリロニトリル－ブタジエン－スチレンの三次元ポリマー等とのポリマーブレンド、アルコール等による後処理物、含塩素化合物による後処理物であってもよい。これらの場合、ポリ塩化ビニル系樹脂における塩化ビニル単位の含有量は、樹脂全量基準で１０質量％以上であってよい。
　ポリ塩化ビニリデン系樹脂は、塩化ビニリデンホモポリマー（ポリ塩化ビニリデン樹脂）であってもよく、例えば、塩化ビニリデンと、塩化ビニリデンと共重合可能なその他のモノマーとをモノマー単位として含む共重合体であってよい。その他のモノマーは、塩化ビニル、アクリル酸と炭素数１～８のアルコールとのアクリル酸エステル、メタクリル酸と炭素数１～８のアルコールとのメタクリル酸エステル、脂肪族カルボン酸のビニルエステル、不飽和脂肪族カルボン酸、オレフィン、ビニルエーテル等であってよい。なお、塩化ビニリデンと塩化ビニルとの共重合体は、ポリ塩化ビニリデン系樹脂に属するものとする。
　ポリ塩化ビニリデン系樹脂における塩化ビニリデン単位の含有量は、フィルムの成形性及び耐熱性の観点から、モノマー単位全量基準で、例えば、６０質量％以上、７０質量％以上、又は８０質量％以上であってよい。ポリ塩化ビニリデン系樹脂における塩化ビニリデン単位の含有量の上限は、特に限定されず、例えば、モノマー単位全量基準で９９質量％以下であってよい。塩化ビニリデン単位の含有量は、核磁気共鳴（ＮＭＲ）装置により測定することができる。
　ポリ塩化ビニリデン系樹脂の重量平均分子量は、例えば、４００００～１８００００、６００００～１６００００、又は８００００～１４００００であってよい。ポリ塩化ビニリデン系樹脂の重量平均分子量は、ＧＰＣ法により、分子量既知のポリスチレンを標準物質として測定することができる。
　ポリ塩化ビニリデン系樹脂の重量平均分子量測定に用いるＧＰＣ法の条件は、以下のとおりである。測定装置としてウォーターズ社製ゲルクロマトグラフＡｌｌｉａｎｃｅ ＧＰＣ２０００型を使用する。ポリ塩化ビニリデン系樹脂を０．５重量％となるようにテトラヒドロフランに溶解させたものを、試料として用いる。
　カラム：東ソー株式会社製ＴＳＫｇｅｌ　ＧＭＨＨＲ－Ｈ（Ｓ）ＨＴ　３０ｃｍ×２、ＴＳＫｇｅｌ　ＧＭＨ６－ＨＴＬ　３０ｃｍ×２
　移動相：テトラヒドロフラン
　検出器：示差屈折計
　流速：１．０ｍＬ／分
　カラム温度：２０℃
　注入量：５００μＬ
　熱可塑性樹脂がポリ塩化ビニル系樹脂又はポリ塩化ビニリデン系樹脂である場合、フィルムは、可塑剤を更に含有していてよい。可塑剤としては、エポキシ化アマニ油、エポキシ化大豆油、エポキシ化脂肪酸アルキルエステル等のエポキシ化油、炭素数６～１０個の直鎖又は分岐アルキル基を有するアジピン酸エステル、アセチルクエン酸トリブチル、アセチル化トリエチル等のヒドロキシ多価カルボン酸エステル、セバシン酸ジノルマルブチル等の脂肪酸族二塩基酸エステル、ペンタエリスリトールエステル、ジエチレングリコールベンゾエート等のグリコールエステル、トリフェニルホスフェート、トリクレジルホスフェート等のリン酸エステル、グリセリンジアセトモノラウレート、塩素化パラフィン、ポリエステル系可塑剤などが挙げられる。これらの可塑剤は、１種単独又は２種以上を組み合わせて用いられる。可塑剤の含有量は、包装される食品の種類、包装形態、包装方法等の用途に応じて、ポリ塩化ビニル系樹脂１００質量部に対して例えば２０～５０質量部の範囲で適宜調整される。
　ポリオレフィン系樹脂としては、ポリエチレン系樹脂等が挙げられ、ポリエチレン系樹脂は、低密度ポリエチレン、線状低密度ポリエチレン、線状超低密度ポリエチレン、中密度ポリエチレン、高密度ポリエチレン、エチレン等をモノマー単位とする共重合体であってよい。具体的には、ポリエチレン系樹脂は、エチレンと、プロピレン、１－ブテン、１－ペンテン、１－ヘキセン、４－メチル－１－ペンテン、１－ヘプテン、１－オクテン等の炭素数３～１０のα－オレフィン、酢酸ビニル、プロピオン酸ビニル等のビニルエステル、アクリル酸メチル、アクリル酸エチル、メタクリル酸メチル、メタクリル酸エチル等の不飽和カルボン酸エステル、共役ジエン、非共役ジエン等の不飽和化合物；などから選ばれる１種又は２種以上との共重合体であってよい。ポリエチレン系樹脂におけるエチレン単位の含有量は、モノマー単位全量基準で５０質量％以上であってよい。
　熱可塑性樹脂の含有量は、生産性に優れる観点から、フィルム全量基準で、７０質量％以上又は７５質量％以上であってよく、また、８５質量％以下又は８０質量％以下であってよい。ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂又はポリオレフィン系樹脂の含有量が上記の範囲であることが好ましく、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂又はポリエチレン系樹脂の含有量が上記の範囲であることがより好ましい。
　青色着色剤は、例えば、可視光領域（３８０～７５０ｎｍ）における最大吸収波長が６００～７５０ｎｍに存在する着色剤である。青色着色剤の可視光領域における最大吸収波長での吸光度は、４７０ｎｍでの吸光度の好ましくは２倍以上、より好ましくは３倍以上である。具体的には、青色着色剤は、銅フタロシアニン（銅フタロシアニンブルー）、ヘキサシアノ鉄（ｉｉ）酸鉄（ＩＩＩ）、酸化第一コバルト・酸化アルミニウム混合物、インジゴ、ウルトラマリン等であってよい。
　青色着色剤の含有量は、識別性に更に優れる観点から、フィルム全量基準で、好ましくは０．４５質量％以上、より好ましくは０．６質量％以上、更に好ましくは０．７５質量％以上、特に好ましくは１．０質量％以上である。青色着色剤の含有量は、製膜性及び生産性に更に優れる観点から、フィルム全量基準で、好ましくは２．２質量％以下、より好ましくは２．０質量％以下、更に好ましくは１．９質量％以下、特に好ましくは１．８質量％以下である。青色着色剤の含有量は、識別性、製膜性及び生産性のすべてで更に優れる観点から、好ましくは、フィルム全量基準で、０．４５～２．２質量％、０．４５～２．０質量％、０．４５～１．９質量％、０．４５～１．８質量％、０．６～２．２質量％、０．６～２．０質量％、０．６～１．９質量％、０．６～１．８質量％、０．７５～２．２質量％、０．７５～２．０質量％、０．７５～１．９質量％、０．７５～１．８質量％、１．０～２．２質量％、１．０～２．０質量％、１．０～１．９質量％、又は１．０～１．８質量％である。青色着色剤の含有量は、好ましくは、後述する白色着色剤の含有量より多い。
　白色着色剤は、例えば、可視光領域（３８０ｎｍ～７５０ｎｍ）の全範囲における吸光度が０．３以下である（可視光線を散乱させる）着色剤である。具体的には、白色着色剤は、酸化チタン、酸化チタン－硫酸バリウム、酸化チタン－ケイ酸マグネシウム、酸化チタン－硫酸カルシウム、酸化亜鉛であってよい。
　白色着色剤の含有量は、識別性に更に優れる観点から、フィルム全量基準で、好ましくは０．１５質量％以上、より好ましくは０．２質量％以上、更に好ましくは０．２５質量％以上、特に好ましくは０．３質量％以上である。白色着色剤の含有量は、製膜性及び生産性に更に優れる観点から、フィルム全量基準で、好ましくは０．５５質量％以下、より好ましくは０．５質量％以下、更に好ましくは０．４５質量％以下、特に好ましくは０．４質量％以下である。白色着色剤の含有量は、識別性、製膜性及び生産性のすべてで更に優れる観点から、好ましくは、フィルム全量基準で、０．１５～０．５５質量％、０．１５～０．５質量％、０．１５～０．４５質量％、０．１５～０．４質量％、０．２～０．５５質量％、０．２～０．５質量％、０．２～０．４５質量％、０．２～０．４質量％、０．２５～０．５５質量％、０．２５～０．５質量％、０．２５～０．４５質量％、０．２５～０．４質量％、０．３～０．５５質量％、０．３～０．５０質量％、０．３～０．４５質量％、又は０．３～０．４質量％である。
　フィルムは、熱可塑性樹脂、青色着色剤及び白色着色剤に加えて、その他の成分を更に含有していてもよい。その他の成分としては、防曇剤、熱安定剤、光安定剤、滑剤、充填剤、プレートアウト防止剤、抗酸化剤、離型剤、粘度低下剤、界面活性剤、青色着色剤及び白色着色剤以外の着色剤、蛍光剤、表面処理剤、架橋剤、加工助剤、粘着剤、帯電防止剤、紫外線吸収剤、アンチブロッキング剤等が挙げられる。
　フィルムは、熱可塑性樹脂、青色着色剤及び白色着色剤を含有する層の一層からなっていてもよく、複数の層からなっていてもよい。フィルムが複数の層からなる場合、フィルムは、例えば第１の表面層と中間層と第２の表面層とをこの順に備えていてよい。この場合、例えば、中間層が青色着色剤及び白色着色剤を含有していてよい。フィルムは、例えば、各層間の接着性を向上させるために、酸変性ポリオレフィン樹脂等を含有する接着層を更に備えていてもよく、フィルムの耐熱性を向上させるために、ポリアミド系樹脂を含有する耐熱層を更に備えていてもよい。熱可塑性樹脂がポリ塩化ビニル系樹脂である場合、フィルムは、好ましくは、熱可塑性樹脂（ポリ塩化ビニル系樹脂）、青色着色剤及びポリグリセリン脂肪酸エステルを含有する層の一層からなっている。
　フィルムの厚さは、食品を外気から効率良く遮断する観点から、好ましくは５μｍ以上、より好ましくは６μｍ以上であってよく、また、取扱い性に優れる観点から、好ましくは２５μｍ以下、より好ましくは１２μｍ以下であってよい。
　フィルムの全光線透過率は、食品の視認性に優れる観点から、好ましくは７０％以上、より好ましくは７５％以上である。フィルムの全光線透過率は、食品に対する識別性に更に優れる観点から、好ましくは８５％以下、より好ましくは８０％以下、更に好ましくは７９％以下である。フィルムの全光線透過率は、ＪＩＳ　Ｋ７３６１－１に準拠して測定された全透過光量に基づき、下記式に従って算出される。
　全光線透過率（％）＝（全透過光量）／（入射光量）×１００
　フィルムは、熱可塑性樹脂、青色着色剤及び白色着色剤を含有する組成物を、Ｖ型ブレンダー、リボンブレンダー、ヘンシェルミキサー、スーパーミキサー等の混合機により混合し、更に必要に応じてミキシングロール、バンバリーミキサー、ニーダ等の混練機により混練することで組成物を得た後、例えば押出成形することにより製造される。具体的には、該組成物を押出機のホッパーに供給しインフレーション法、Ｔダイ法等で目的とするフィルムが得られる。一般に、フィルムは、作製しつつ巻き取られ、巻き取られたフィルムは、２０ｍ、５０ｍ等の所望の長さごとに更に巻き替えられ（小巻状とされ）、化粧箱に詰められることで製品とされる。すなわち、本実施形態におけるフィルムは、食品包装用小巻フィルムの形態であってもよく、化粧箱付食品包装用小巻フィルムの形態であってもよい。
　具体的には、図１に示すように、化粧箱付食品包装用小巻フィルム１は、食品包装用フィルム２と、食品包装用フィルム２が小巻された芯材３と、食品包装用フィルム２及び芯材３が収納された化粧箱４とを備え、化粧箱４には、食品包装用フィルム２を切断するための刃部５が設けられている形態であってよい。芯材３及び化粧箱４の材質は、特に限定されない。フィルム２の色を外部から認識しやすい観点から、化粧箱４の少なくとも一部は、好ましくは透明であるか、箱としての機能を損なわない程度に穴が開いている。
　フィルムが複数の層からなる場合、フィルムは、各層の構成原料を、それぞれ別々の押出機に投入して溶融押出し、インフレーション、Ｔダイ法等により各層を共押出して積層することにより得られる。この際、Ｔダイより押出した溶融物をそのまま、キャスティングロール等で急冷しながら引き取るようにしてフィルムを形成することが好ましい。
　このようにして得られたフィルムに対して、熱収縮率、自然収縮率等の軽減、幅収縮の発生の抑制などの目的に応じて、加熱ロール間での縦延伸、各種の熱固定、エージング等の熱処理を行ってもよく、防曇性、帯電防止性、粘着性等を付与、促進させる目的で、コロナ処理、熟成等の処理、印刷、コーティング等の表面処理及び表面加工などを行ってもよい。
　以上説明したフィルムは、包装した食品を外部から視認可能なフィルムである。また、フィルムは、延伸性（伸縮性ともいう）を有するフィルム（ストレッチフィルム）である。
　本実施形態に係るフィルムは、食品の仕分けに用いられる食品の仕分け用フィルムであってよい。本実施形態に係るフィルムを用いると、２種類以上の食品を食品の種類に応じて少なくとも２つのグループに仕分けることができる。すなわち、例えば、第１の食品を本実施形態に係るフィルムで包装して第１のグループに仕分け、その一方で、第２の食品を、本実施形態に係るフィルムと異なる色を有するフィルム又は無色フィルムで包装して第２のグループに仕分けることができる。
　具体的には、例えば、第１のアレルギー物質を含む第１の食品と、第２のアレルギー物質を含む第２の食品とがある場合に、第１のアレルギー物質に対してアレルギー症状を有さない人に供される食品群である第１のグループに第１の食品を仕分け、その一方で、第２のアレルギー物質に対してアレルギー症状を有さない人に供される食品群である第２のグループに第２の食品を仕分ける。上記例では、第１又は第２のアレルギー物質に対してアレルギー症状を有する人に、当該アレルギー物質を供してしまう事故の発生を抑制できる。
　以下、実施例に基づいて本発明を更に具体的に説明するが、本発明は実施例に限定されるものではない。
＜実施例１～６及び比較例１～４＞
　表１，２に示す熱可塑性樹脂、青色着色剤、白色着色剤及び各種添加剤をスーパーミキサーに投入した後、攪拌しながら材料温度を常温から１３０℃まで昇温し、混合した後、７０℃まで冷却した時点で取り出して樹脂組成物を調製し、各樹脂組成物をＴダイ（幅３５０ｍｍ、ギャップ０．４ｍｍ）を装着したΦ４０ｍｍ単軸押出機（Ｌ／Ｄ＝２０）にて、樹脂温度２００℃で押出し、厚み８μｍのフィルムを作製した。なお、表中の数値は固形分換算の値であり、質量％を表す。
＜実施例７～１５及び比較例５～６＞
　表３，４に示す以下の熱可塑性樹脂、青色着色剤、白色着色剤及び各種添加剤を用いて樹脂組成物を調製し、各樹脂組成物をインフレーション製膜装置で押出し、厚み９μｍのフィルムを作製した。なお、表中の数値は固形分換算の値であり、質量％を表す。
熱可塑性樹脂ａ１：ポリ塩化ビニル系樹脂（大洋塩ビ株式会社製、「ＴＨ－１０００」、平均重合度：１０００）
熱可塑性樹脂ａ２：ポリエチレン系樹脂（株式会社プライムポリマー製、「ネオゼックス０２３４Ｎ」）
塩化ビニリデン系樹脂ａ３：塩化ビニリデンと塩化ビニルとの共重合体（塩化ビニリデン／塩化ビニル（質量比）＝９０／１０）、重量平均分子量：８００００
青色着色剤ｂ１：銅フタロシアニン（銅フタロシアニンブルー、大日精化工業株式会社製、「ＮＸ－０５３ブルー」）
白色着色剤ｃ１：酸化チタン（堺化学工業株式会社製、「ＦＴＲ－７００」）
添加剤ｄ１：アジピン酸ジオクチル（新日本理化株式会社製、「サンソサイザーＤＯＡ」）
添加剤ｄ２：エポキシ化大豆油（三和合成化学株式会社製、「ケミサイザーＳＥ－１００」）
添加剤ｄ３：グリセリン脂肪酸エステル（理研ビタミン株式会社製、「ＸＯ－１００」）
添加剤ｄ４：Ｃａ／Ｚｎ系安定剤（株式会社ＡＤＥＫＡ製、「ＳＣ－３０８Ｅ」）
添加剤ｄ５：セバシン酸ジブチル（豊国製油株式会社製、「ＤＢＳ」）
添加剤ｄ６：アセチルクエン酸トリブチル（旭化成ファインケム株式会社製、「ＡＴＢＣ」）
　得られた各フィルムについて、以下に示すとおり、全光線透過率の測定及び食品に対する識別性の評価を実施した。結果を表１～４に示す。
（全光線透過率の測定）
　日本電色工業社製ヘーズメーター（型式：ＮＤＨ５０００）にてＪＩＳ　Ｋ７３６１－１に準拠してフィルムの全透過光量を測定し、下記式に従ってフィルムの全光線透過率を算出した。
　全光線透過率（％）＝（全透過光量）／（入射光量）×１００
（識別性の評価）
　得られたフィルムから３ｍｍ～１０ｍｍ角の破片を作製し、食品へフィルムを混入させた際に、フィルムの破片を識別できるかを目視で観察した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、識別性に優れているといえる。
Ａ：食品に対してフィルムを識別することが極めて容易である。
Ｂ：食品に対してフィルムを識別することが容易である。
Ｃ：食品に対してフィルムを識別することが困難である。
（製膜性の評価）
　Ｔダイ押出機にて、各樹脂組成物を樹脂温度２００℃で押出してフィルムの成形を行い、得られたフィルムの外観を観察することで製膜性を評価した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、製膜性に優れているといえる。
Ａ：ほぼ均一の厚みのフィルムが得られ、２４時間の押出でヤケが発生しなかった。
Ｂ：フィルムの厚みにわずかにむらが見られ、２４時間の押出でヤケが発生した。
Ｃ：フィルムの厚みむらが激しく、８時間の押出でヤケが発生した。
（生産性の評価）
　Ｔダイ押出機にて、各樹脂組成物を樹脂温度２００℃で押出してフィルムの成形を行う際に生じる生産トラブル（穴開き、フィルム切れ及びスリット不具合）の２４時間あたりの発生回数をカウントすることで生産性を評価した。評価基準は、以下のとおりである。なお、評価がＡ又はＢであれば、生産性に優れているといえる。
Ａ：生産トラブル回数が０～２回
Ｂ：生産トラブル回数が３～４回
Ｃ：生産トラブル回数が５回以上
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000004
　１…化粧箱付食品包装用小巻フィルム、２…食品包装用フィルム、３…芯材、４…化粧箱、５…刃部。

Claims (8)

  1. 　熱可塑性樹脂と、青色着色剤と、白色着色剤と、を含有する食品包装用フィルム。
  2. 　前記青色着色剤の含有量が、フィルム全量基準で０．４５～２．２質量％である、請求項１に記載の食品包装用フィルム。
  3. 　前記白色着色剤の含有量が、フィルム全量基準で０．１５～０．５５質量％である、請求項１又は２に記載の食品包装用フィルム。
  4. 　前記熱可塑性樹脂が、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂及びポリアミド系樹脂からなる群より選ばれる少なくとも１種である、請求項１～３のいずれか一項に記載の食品包装用フィルム。
  5. 　前記熱可塑性樹脂として、ポリ塩化ビニル系樹脂、ポリ塩化ビニリデン系樹脂及びポリオレフィン系樹脂からなる群より選ばれる少なくとも１種をフィルム全量基準で７０質量％以上含有する、請求項１～４のいずれか一項に記載の食品包装用フィルム。
  6. 　前記フィルムが、包装した食品を外部から視認可能なフィルムである、請求項１～５のいずれか一項に記載の食品包装用フィルム。
  7. 　前記フィルムの全光線透過率が７０％以上である、請求項１～６のいずれか一項に記載の食品包装用フィルム。
  8. 　請求項１～７のいずれか一項に記載の食品包装用フィルムと、前記食品包装用フィルムが小巻された芯材と、前記食品包装用フィルム及び前記芯材が収納された化粧箱とを備え、
    　前記化粧箱には、前記食品包装用フィルムを切断するための刃部が設けられている、化粧箱付食品包装用小巻フィルム。
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