JP7021951B2 - Film for food packaging and small roll film for food packaging with cosmetic box - Google Patents

Description

The present invention relates to a food packaging film and a small roll film for food packaging with a cosmetic box.

Conventionally, food packaging films have been widely used for business purposes in hotels, restaurants and the like, or at home for food preservation, cooking and the like. In recent years, in order to make it easy to visually distinguish the contamination of film fragments into food, a food packaging film containing a thermoplastic resin as a main component and further containing a colorant such as a copper phthalocyanine colorant has been proposed. (Patent Document 1).

On the other hand, in a film for food packaging, additives such as a plasticizer, an antifogging agent, and a stabilizer are generally used for the purpose of imparting functions such as flexibility to the film and facilitating the production of the film. There is.

By the way, in recent years, the standards and standards of the Food Sanitation Law have been studied in harmony with other countries, and the standard of the amount of additives contained in food packaging films to be eluted into food has become a problem. One of the most influential ideas at present is that the amount of the additive eluted into food should meet the assumed standard value of 25 μg / ml in EU standards / standards.

Japanese Unexamined Patent Publication No. 2015-7198

An object of the present invention is to provide a food packaging film and a small roll film for food packaging with a cosmetic box, which can suppress the elution of additives into food and have excellent film-forming properties and productivity.

The present invention provides a food packaging film containing a thermoplastic resin, a blue colorant, and a polyester-based plasticizer having a number average molecular weight of 1000 to 1800.

The content of the polyester-based plasticizer is preferably 6.5 to 12.5% 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-based resins, polyvinylidene chloride-based resins, polyolefin-based resins, polystyrene-based resins, polyester-based resins, and polyamide-based resins.

The film may contain at least one selected from the group consisting of a polyvinyl chloride resin and a polyvinylidene chloride resin as the thermoplastic resin in an amount of 70% by mass or more based on the total amount of the film.

Further, the present invention includes the above-mentioned food packaging film, a core material in which the food packaging film is wound in small rolls, and a cosmetic box containing the food packaging film and the core material. Provided is a small roll film for food packaging with a cosmetic box provided with a blade for cutting the packaging film.

According to the present invention, it is possible to provide a food packaging film and a small roll film for food packaging with a cosmetic box, which can suppress the elution of the additive into food and have excellent film-forming property and productivity.

It is a schematic diagram which shows the small roll film for food packaging with a cosmetic box.

The film according to the present embodiment contains a thermoplastic resin, a blue colorant, and a polyester-based plasticizer having a number average molecular weight of 1000 to 1800 (hereinafter, also referred to as “predetermined polyester-based plasticizer”). It is suitably used as a film for food packaging.

The thermoplastic resin is a polyvinyl chloride resin such as polyvinyl chloride; a polyvinylidene chloride resin such as polyvinylidene chloride; a polyolefin resin such as polyethylene, polypropylene, an ethylene-vinyl acetate copolymer saponified product; and a butadiene-styrene resin. Polystyrene resins such as polymers, acrylonitrile-styrene copolymers, polystyrenes, styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, styrene-acrylic acid copolymers; polyethylene terephthalates, polyethylene naphthalates, A polyester resin such as polybutylene terephthalate; a polyamide resin such as 6-nylon, 6,6-nylon, and 12-nylon; and the like may be used. The thermoplastic resin is preferably a polyvinyl chloride-based resin or a polyvinylidene chloride-based resin from the viewpoint of excellent handleability.

As the polyvinyl chloride resin, a polyvinyl chloride resin having an average degree of polymerization of 700 to 1300 is preferable from the viewpoint of excellent film formability, heat resistance and fluidity. The average degree of polymerization in the present specification means the 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 may be copolymerized with vinyl chloride for the purpose of imparting other properties. 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; and lauryl. Alkyl vinyl ethers such as vinyl ethers; maleic acid, acrylonitrile, styrene, methylstyrene, vinylidene fluoride; and the like can be mentioned. When the polyvinyl chloride resin is a copolymer, the content of the vinyl chloride unit in the copolymer may be 10% by mass or more based on the total amount of the monomer units, and is preferably 30 from the viewpoint of excellent mechanical properties. By mass or more, more preferably 50% by mass or more. The upper limit of the content of the vinyl chloride unit in the copolymer is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of the monomer units.

The polyvinyl chloride resin may be, for example, a polymer blend with a three-dimensional polymer of acrylonitrile-butadiene-styrene, a post-treated product with alcohol or the like, or a post-treated product with a chlorine-containing compound. In these cases, 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 polyvinylidene chloride homopolymer (polyvinylidene chloride resin), and is, for example, a copolymer containing vinylidene chloride and another monomer copolymerizable with vinylidene chloride as a monomer unit. It's okay. Other monomers include vinyl chloride, acrylic acid ester of acrylic acid and alcohol having 1 to 8 carbon atoms, methacrylic acid ester of methacrylic acid and alcohol having 1 to 8 carbon atoms, vinyl ester of aliphatic carboxylic acid, and unsaturated. It may be an aliphatic carboxylic acid, an olefin, a vinyl ether or the like. The copolymer of vinylidene chloride and vinyl chloride belongs to the polyvinylidene chloride resin.

The content of 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 monomer units from the viewpoint of film moldability and heat resistance. It's okay. The upper limit of the content of 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 by a nuclear magnetic resonance (NMR) device.

The weight average molecular weight of the polyvinylidene chloride resin may be, for example, 40,000 to 180,000, 60,000 to 160000, or 80,000 to 140000. The weight average molecular weight of the polyvinylidene chloride resin can be measured by the 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., Ltd. is used as a measuring device. A polyvinylidene chloride-based resin dissolved in tetrahydrofuran so as to be 0.5% by weight is used as a sample.
Column: TSKgel GMHHR-H (S) HT 30 cm x 2 manufactured by Tosoh Corporation, TSKgel GMH6-HTL 30 cm x 2
Mobile phase: Tetrahydrofuran Detector: Differential refractometer Flow rate: 1.0 mL / min Column temperature: 20 ° C
Injection volume: 500 μL

From the viewpoint of excellent productivity, the content of the thermoplastic resin may be 70% by mass or more or 75% by mass or more, and may be 85% by mass or less or 80% by mass or less based on the total amount of the film. The content of the polyvinyl chloride resin or the polyvinylidene chloride resin is preferably in the above range.

The blue colorant is, for example, a colorant having a maximum absorption wavelength of 600 to 750 nm in the visible light region (380 to 750 nm). The absorbance of the blue colorant at the maximum absorption wavelength in the visible light region is preferably 2 times or more, more preferably 3 times or more the absorbance at 470 nm. Specifically, the blue colorant may be copper phthalocyanine (copper phthalocyanine blue), iron hexacyanoferrate (ii) (III), a mixture of primary cobalt oxide and aluminum oxide, indigo, ultramarine and the like.

The content of the blue colorant may be 0.5% by mass or more and may be 2.0% by mass or less based on the total amount of the film.

The number average molecular weight of the polyester-based plasticizer is 1000 to 1800, preferably 1200 to 1800, more preferably 1300 to 1800, still more preferably 1400 to 1800, from the viewpoint of further suppressing the elution of the additive into food. Particularly preferably, it is 1500 to 1800. The number average molecular weight in the present invention is a polystyrene-equivalent number average molecular weight measured by GPC (for example, model: Agilent 1260 Infinity GPC manufactured by Agilent Technologies, Inc.).

The conditions of GPC in measuring the number average molecular weight of the polyester-based plasticizer are as follows. A gel chromatograph Alliance GPC2000 manufactured by Waters Co., Ltd. is used as a measuring device. After completely dissolving 30 mg of the sample in 20 mL of o-dichlorobenzene at 145 ° C., the solution is filtered through a sintered filter having a pore size of 0.45 μm, and the filtrate is used as a sample solution. Other conditions are as follows.
Column: TSKgel GMHHR-H (S) HT 30 cm x 2 manufactured by Tosoh Corporation, TSKgel GMH6-HTL 30 cm x 2
Mobile phase: o-dichlorobenzene detector: differential refractometer Flow rate: 1.0 mL / min Column temperature: 140 ° C
Injection volume: 500 μL

Examples of the polyester-based plasticizer include aliphatic polybasic acid-based polyester plasticizers. The aliphatic polybasic acid-based polyester plasticizer may be, for example, a polyester resin containing an aliphatic polybasic acid such as adipic acid or sebacic acid and a polyhydric alcohol such as ethylene glycol, propylene glycol or butanediol. Specific examples of the aliphatic polybasic acid polyester plasticizer include poly (ethylene glycol / adipate) ester, poly (1,3-butanediol / adipate) ester, and poly (1,4-butanediol /). Examples thereof include adipate) ester and poly (propylene glycol / sebacic acid) ester. These polyester-based plasticizers may be used alone or in combination of two or more.

The content of the predetermined polyester-based plasticizer is preferably 6.5% by mass or more, more preferably 7.0% by mass or more, and further, based on the total amount of the film, from the viewpoint of further suppressing the elution of the additive into food. It is preferably 8.0% by mass or more, and particularly preferably 10.0% by mass or more. The content of the predetermined polyester-based plasticizer is preferably 12.5% by mass or less, more preferably 12.0% by mass or less, based on the total amount of the film, from the viewpoint of further excellent film forming property and productivity. The content of the predetermined polyester-based plasticizer is preferably 6.5 to 12. 5% by mass, 6.5 to 12.0% by mass, 7.0 to 12.5% by mass, 7.0 to 12.0% by mass, 8.0 to 12.5% by mass, 8.0 to 12. It is 0% by mass, 10.0 to 12.5% by mass, or 10.0 to 12.0% by mass.

The film may further contain other components in addition to the thermoplastic resin, the blue colorant and the predetermined polyester-based plasticizer. Other components include heat stabilizers, light stabilizers, plasticizers other than predetermined polyester-based plasticizers, lubricants, fillers, plate-out inhibitors, antioxidants, mold release agents, viscosity reducing agents, and surfactants. , Colorants other than blue colorants, fluorescent agents, surface treatment agents, cross-linking agents, processing aids, pressure-sensitive adhesives, antistatic agents, ultraviolet absorbers, anti-blocking agents and the like.

The film may be composed of one layer containing a thermoplastic resin, a blue colorant and a predetermined polyester-based plasticizer, or may be composed of a plurality of layers. When the film is 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. In this case, for example, the first and second surface layers may contain a thermoplastic resin and a predetermined polyester-based plasticizer, and the intermediate layer may contain a thermoplastic resin and a blue colorant. The film may be further provided with an adhesive layer containing an acid-modified polyolefin resin or the like in order to improve the adhesiveness between the layers, and may contain a polyamide-based resin in order to improve the heat resistance of the film. A heat-resistant layer may be further provided. When the thermoplastic resin is a polyvinyl chloride resin, the film preferably consists of one layer of a layer containing a thermoplastic resin (polyvinyl chloride resin), a blue colorant and a predetermined polyester plasticizer. ..

The thickness of the film may be preferably 5 μm or more, more preferably 6 μm or more from the viewpoint of efficiently blocking food from the outside air, and preferably 25 μm or less, more preferably 12 μm from the viewpoint of excellent handleability. It may be as follows.

The elution amount of the additive contained in the film is preferably 25 μg / ml or less, more preferably 20 μg / ml or less, respectively, as the heptane elution amount and the isooctane elution amount measured according to the following procedure.

(Amount of heptane elution)
A sample of a certain area is cut from the film, and the sample is immersed in 2 ml of heptane per 1 ^cm2 of the surface area of the sample at a temperature of 25 ° C. for 1 hour. Next, the heptane solution after taking out the sample is evaporated to dryness, and the mass of the solid substance is measured to determine the elution amount of the additive from the film to heptane.

(Isooctane elution amount)
A sample of a certain area is cut from the film, and the sample is immersed in 2 ml of isooctane solution per 1 cm ² of the surface area of the sample at a temperature of 25 ° C. for 30 minutes. Next, the isooctane solution after taking out the sample is evaporated to dryness, and the mass of the solid substance is measured to determine the elution amount of the additive from the film to isooctane.

In the film, a composition containing a thermoplastic resin, a blue colorant and a predetermined polyester-based plasticizer is mixed by a mixer such as a V-type blender, a ribbon blender, a henschel mixer, a super mixer, etc., and further mixed as necessary. The composition is obtained by kneading with a kneader such as a roll, a Banbury mixer, or a kneader, and then produced by, for example, extrusion molding. Specifically, the composition is supplied to the hopper of the extruder to obtain a target film by an inflation method, a T-die method, or the like. In general, the film is wound while being produced, and the wound film is further rewound (in the form of a small roll) at a desired length such as 20 m or 50 m, and is packed in a cosmetic box to produce a product. It is said that. That is, the film in the present embodiment may be in the form of a small roll film for food packaging, or may be in the form of a small roll film for food packaging with a cosmetic box.

Specifically, as shown in FIG. 1, the small roll film 1 for food packaging with a cosmetic box includes a food packaging film 2, a core material 3 in which the food packaging film 2 is wrapped in small rolls, and a food packaging film. 2 and a decorative box 4 in which the core material 3 is housed may be provided, and the decorative box 4 may be provided with a blade portion 5 for cutting the food packaging film 2. The materials of the core material 3 and the decorative box 4 are 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 holes to the extent that the function as a box is not impaired.

When the film is composed of a plurality of layers, the film is obtained by putting the constituent raw materials of each layer into separate extruders, melt-extruding them, and co-extruding each layer by inflation, T-die method or the like to laminate them. At this time, it is preferable to form a film by taking the melt extruded from the T-die as it is while quenching it with a casting roll or the like.

For the film thus obtained, longitudinal stretching between heating rolls, various heat fixing, and aging are performed according to the purpose of reducing the heat shrinkage rate, the natural shrinkage rate, etc., and suppressing the occurrence of width shrinkage. For the purpose of imparting and promoting anti-fog property, antistatic property, adhesiveness, etc., heat treatment such as corona treatment, aging treatment, printing, surface treatment such as coating, and surface treatment are performed. May be good.

The film described above is a film in which the packaged food can be visually recognized from the outside. Further, 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 food sorting. By using the film according to the present embodiment, two or more kinds of foods can be sorted into at least two groups according to the kind of foods. That is, for example, the first food is wrapped in the film according to the present embodiment and sorted into the first group, while the second food is a film having a different color from the film according to the present embodiment or colorless. It can be wrapped in film and sorted into a second group.

Specifically, for example, when there is a first food containing the first allergic substance and a second food containing the second allergic substance, the person has an allergic symptom to the first allergic substance. The first food group is sorted into the first group, which is a food group provided to those who do not have it, while the first food group is provided to people who do not have allergic symptoms to the 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 an allergic substance is provided to a person who has allergic symptoms to the first or second allergic substance.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to Examples.

After adding the thermoplastic resin, blue colorant, and various additives shown in Tables 1 and 2 to the super mixer, the material temperature was raised from room temperature to 130 ° C. with stirring, mixed, and then cooled to 70 ° C. At this point, the resin composition was taken out to prepare a resin composition, and each resin composition was subjected to a Φ40 mm single-screw extruder (L / D = 20) equipped with a T-die (width 350 mm, gap 0.4 mm) at a resin temperature of 200 ° C. Extruded to prepare a film having a thickness of 8 μm. The numerical values in the table are values in terms of solid content and represent% by mass.

Thermoplastic resin a1: Polyvinyl chloride resin (manufactured by Taiyo PVC Co., Ltd., "TH-1000", average degree of polymerization: 1000)
Blue colorant b1: Copper phthalocyanine (copper phthalocyanine blue, manufactured by Dainichiseika Kogyo Co., Ltd., "NX-053 blue")
Additive c1: Polyester-based plasticizer (manufactured by ADEKA Corporation, "PN-150", number average molecular weight: 1000, adipic acid-based polyester)
Additive c2: Polyester-based plasticizer (manufactured by J-PLUS Co., Ltd., "D623", number average molecular weight: 1800, adipic acid-based polyester)
Additive c3: Polyester-based plasticizer (manufactured by J-PLUS Co., Ltd., "D620N", number average molecular weight: 800, adipic acid-based polyester)
Additive c4: Polyester-based plasticizer (manufactured by ADEKA Corporation, "P-200", number average molecular weight: 2000, adipic acid-based polyester)
Additive c5: Dioctyl adipate (manufactured by Shin Nihon Rika Co., Ltd., "Sun Sizar DOA")
Additive c6: Epoxidized soybean oil (manufactured by Sanwa Synthetic Chemical Co., Ltd., "Chemisizer SE-100")
Additive c7: Glycerin fatty acid ester (manufactured by RIKEN Vitamin Co., Ltd., "XO-100")
Additive c8: Ca / Zn-based stabilizer (manufactured by ADEKA Corporation, "SC-308E")

For each of the obtained films, the elution amount of the additive was measured by the following procedure.

(Amount of heptane elution)
A sample of 5 cm × 10 cm was cut from the film so that the total surface area of the front and back surfaces was 100 cm ² , and the sample was immersed in 2 ml of heptane per 1 cm ² of the surface area of the sample at a temperature of 25 ° C. for 1 hour. Then, the test solution after taking out the sample was evaporated to dryness at 105 ° C. and allowed to cool. The mass of the solid content after cooling was measured, and the amount of the component eluted from the film to heptane was determined by calculating according to the following formula. In the case of a polyvinyl chloride resin, it can be said that it is good if it is 150 μg / ml or less, and it can be said that it is very good if it is 30 μg / ml or less.
Evaporation residue (μg / ml) = weight of solid content (μg) / amount of test solution collected (ml)

(Isooctane elution amount)
A 5 cm × 10 cm sample was cut from the film so that the total surface area of the front and back surfaces was 100 cm ² , and the sample was immersed in 2 ml of isooctane solution per 1 cm ² of the surface area of the sample at a temperature of 25 ° C. for 30 minutes. Then, the test solution after taking out the sample was evaporated to dryness at 105 ° C. and allowed to cool. The mass of the solid matter after cooling was measured, and the amount of elution of the component from the film to isooctane was determined by calculating according to the following formula. In the case of a polyvinyl chloride resin, it can be said that 90 μg / ml or less is good, and 30 μg / ml or less is very good.
Evaporation residue (μg / ml) = weight of solid content (μg) / amount of test solution collected (ml)

(Evaluation of film-forming property)
Each resin composition was extruded at a resin temperature of 200 ° C. to form a film with a T-die extruder, and the film-forming property was evaluated by observing the appearance of the obtained film. The evaluation criteria are as follows. If the evaluation is A or B, it can be said that the film-forming property is excellent.
A: A film having a substantially uniform thickness was obtained, and no discoloration occurred after 24 hours of extrusion.
B: The thickness of the film was slightly uneven, and the film was burnt after 24 hours of extrusion.
C: The thickness of the film was uneven, and the film was burnt after 8 hours of extrusion.

(Evaluation of productivity)
Count the number of production troubles (perforations, film breakage, slit defects) that occur when each resin composition is extruded at a resin temperature of 200 ° C. to form a film with a T-die extruder per 24 hours. The productivity was evaluated in. The evaluation criteria are as follows. If the evaluation is A or B, it can be said that the productivity is excellent.
A: The number of production troubles is 0 to 2 times B: The number of production troubles is 3 to 4 times C: The number of production troubles is 5 times or more

1 ... Small roll film for food packaging with cosmetic box, 2 ... Film for food packaging, 3 ... Core material, 4 ... Cosmetic box, 5 ... Blade.

Claims (3)

With a thermoplastic resin of 73% by mass or more based on the total amount of film ,
With blue colorant,
It contains a polyester-based plasticizer having a number average molecular weight of 1000 to 1800, which is 7.0% by mass or more based on the total amount of the film .
The thermoplastic resin is a polyvinyl chloride resin, a polyvinylidene chloride resin, a polyolefin resin which is polyethylene or polypropylene, a polystyrene resin, a polyethylene terephthalate, a polyester resin which is polyethylene naphthalate or polybutylene terephthalate, and a polyamide resin. A film for food packaging consisting of at least one selected from the group consisting of resins . The food packaging film according to claim 1, wherein the content of the polyester-based plasticizer is 7.0 to 12.5% by mass based on the total amount of the film. The food packaging film according to claim 1 or 2 , a core material in which the food packaging film is wrapped in small rolls, and a cosmetic box containing the food packaging film and the core material are provided.
The cosmetic box is provided with a blade for cutting the food packaging film, and is a small roll film for food packaging with a cosmetic box.

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