阅读说明：本技术 包装膜卷绕体和包装膜收容体及其制造方法 (Packaging film roll, packaging film container, and method for producing same ) 是由 佐原俊也 于 2018-06-14 设计创作，主要内容包括：本发明的一个方式涉及一种包装膜卷绕体,其具备筒状的卷芯、以及卷绕于卷芯的包装膜,卷芯的外径小于或等于20mm。(One embodiment of the present invention relates to a packaging film roll body including a cylindrical roll core and a packaging film wound around the roll core, wherein the outer diameter of the roll core is 20mm or less.)

1. A packaging film roll body comprising a cylindrical roll core and a packaging film wound around the roll core,

the outer diameter of the winding core is less than or equal to 20 mm.

2. The packaging film roll according to claim 1, wherein the inner diameter of the core is 18mm or less.

3. The wrapping film roll according to claim 1 or 2, which is a resin film.

4. The roll of packaging film according to claim 3, wherein the resin film comprises at least one resin selected from the group consisting of polyvinylidene chloride-based resins, polyvinyl chloride-based resins, and polyolefin-based resins.

5. The roll of packaging film according to any one of claims 1 to 4, which is used in at least one use selected from the group consisting of food packaging, medical packaging, odor barrier, and moisture barrier.

6. A packaging film container comprising:

the packaging film roll according to any one of claims 1 to 5, and

a box body for accommodating the packaging film roll body.

7. A method for manufacturing a packaging film container, comprising the steps of:

a step of winding the packaging film around a cylindrical winding core having an outer diameter of 20mm or less to obtain a wound body of the packaging film; and

and a step of housing the wound body of packaging film in a case to obtain a packaging film housing body.

8. A method of packaging a packaged object outdoors using the packaging film stored in the packaging film storage according to claim 6.

Technical Field

The present invention relates to a packaging film roll, a packaging film container, and a method for manufacturing the same.

Background

Conventionally, packaging films have been widely used for home use, or for business use in hotels, restaurants, and the like, for food storage, cooking, and the like (for example, patent document 1). The packaging film is generally in the form of a wound body of packaging film wound around a core, and is cut from the wound body of packaging film in a required amount for use.

Disclosure of Invention

Problems to be solved by the invention

According to the studies of the present inventors, the conventional wrapping film roll has a problem that cutting scraps are likely to be generated when the wrapping film is cut. If the cutting chips are generated, there is a concern that the packaging film may be mixed into the food.

Accordingly, an object of the present invention is to provide a wrapping film roll body capable of suppressing the generation of cutting chips when a wrapping film is cut.

Means for solving the problems

The present inventors have studied the cause of the generation of the cutting scraps, and as a result, have found that even if a case housing a roll of packaging film, a blade for cutting the packaging film, and the like are the same, the degree of generation of the cutting scraps varies depending on the diameter of a core around which the packaging film is wound, and have completed the present invention. One embodiment of the present invention relates to a packaging film roll body including a cylindrical roll core and a packaging film wound around the roll core, wherein the outer diameter of the roll core is 20mm or less.

The inner diameter of the winding core may be less than or equal to 18 mm.

The packaging film may be a resin film. The resin film may include at least one resin selected from the group consisting of a vinylidene chloride resin, a polyvinyl chloride resin, and a polyolefin resin.

The packaging film may be used in at least one use selected from the group consisting of food packaging, medical packaging, odor barrier, and moisture barrier.

In another aspect, the present invention relates to a packaging film container including: the above-described wrapping film roll and a case housing the wrapping film roll.

In another aspect, the present invention relates to a method for manufacturing a packaging film container, including the steps of: a step of winding the packaging film around a cylindrical winding core having an outer diameter of 20mm or less to obtain a wound body of the packaging film; and a step of housing the packaging film roll in a case to obtain a packaging film housing body.

In another aspect, the present invention relates to a method for packaging a packaged object outdoors using a packaging film stored in the packaging film storage body.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a wrapping film roll body capable of suppressing the generation of cutting chips when a wrapping film is cut can be provided.

Drawings

Fig. 1 is a schematic view of a wrapping film roll according to an embodiment.

Fig. 2 is a schematic cross-sectional view of a winding core according to an embodiment.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings as appropriate.

Fig. 1 is a schematic view of a wrapping film roll according to an embodiment. As shown in fig. 1, the packaging film roll 1 includes a cylindrical winding core 2 and a packaging film 3 wound around the winding core 2.

The winding core 2 may be, for example, substantially cylindrical. The material of the winding core 2 may be paper such as paper tube stock, liner paper, parchment paper, forest paper, and cardboard. The length of the core 2 in the longitudinal direction is preferably 280mm or less, 240mm or less, 200mm or less, or 160mm or less, and may be 120mm or more, for example, from the viewpoint that the core 2 is easily bent and the core 2 (packaging film roll 1) is easily bent and discarded. If the length of the winding core 2 in the longitudinal direction is within the above range, it is easy to apply a force uniformly with one hand at the time of use, and it is possible to reduce the distortion of the packaging film 3. The thickness of the packaging film 3 may become uneven due to the twisting of the packaging film 3, and the cutting performance may be reduced, but if the length of the core 2 in the longitudinal direction is within the above range, the reduction in the cutting performance can be suppressed.

Fig. 2 is a schematic cross-sectional view showing a cross section (hereinafter, simply referred to as "cross section") of the winding core 2 perpendicular to the longitudinal direction. The cross-sectional shape of the winding core 2 is, for example, substantially circular. The outer diameter D1 of the core 2 is preferably equal to or less than 20mm from the viewpoint of suppressing the generation of cutting chips, and is more preferably equal to or less than 18mm, and even more preferably equal to or less than 15mm from the viewpoint of further suppressing the generation of cutting chips. The outer diameter D1 of the core 2 is preferably equal to or greater than 8mm, more preferably equal to or greater than 10mm, and still more preferably equal to or greater than 12mm, from the viewpoint of facilitating winding of the packaging film 3 around the core 2. The outer diameter D1 of the winding core 2 is defined as the maximum length connecting two points on the outer periphery of the cross-sectional shape of the winding core 2, and is calculated as the average value of the outer diameters measured on arbitrary 5 cross-sections of the winding core 2.

In the wrapping film roll 1 of the present embodiment, the outer diameter D1 of the winding core 2 is set to the above value, thereby effectively preventing the generation of cutting chips. The reason for this is not clear, but the present inventors have predicted that the reason for the generation of cutting debris is that a force applied when the packaging film 3 is cut is not uniformly applied to the packaging film 3, and it is considered that it is effective to set the outer diameter D1 of the winding core 2 to which a force is easily uniformly applied in order to eliminate this phenomenon. That is, it is considered that since the distance from the center of gravity of the core 2 to the packaging film 3 is short in the packaging film roll 1, the packaging film 3 is easily stably applied with force when cutting the packaging film 3, and the generation of cut debris can be suppressed. On the other hand, in the conventional wrapping film roll body in which the outer diameter of the winding core exceeds 20mm, it is considered that the stability against the force at the time of cutting can be secured by the weight of the wrapping film itself at the time of starting use, but the stability is lost by the weight of the wrapping film itself as the wrapping film is used, and the influence of the force to cut the wrapping film is relatively increased, so that cutting scraps are likely to be generated. In other words, the wrapping film roll 1 of the present embodiment can effectively suppress the generation of cutting chips particularly when the amount of the wrapping film 3 wound around the core 2 is small.

The inner diameter D2 of the core 2 is preferably 18mm or less, more preferably 15mm or less, and still more preferably 12mm or less, from the viewpoint of ensuring the strength of the core 2. The inner diameter D2 of the core 2 is preferably equal to or greater than 6mm, more preferably equal to or greater than 8mm, and still more preferably equal to or greater than 10mm, from the viewpoint of excellent easy-opening properties of the packaging film 3. The inner diameter D2 of the winding core 2 is defined as the maximum length connecting two points on the inner periphery of the cross-sectional shape of the winding core 2, and is calculated as the average value of the inner diameters measured on arbitrary 5 cross-sections of the winding core 2.

Such a winding core 2 can suppress the generation of cutting chips and can be easily bent. This makes it easy to bend the winding core 2 (packaging film roll 1) and discard it. The outer diameter D1 in the core 2 is within the above range, and the difference between the outer diameter D1 and the inner diameter D2 (D1-D2; corresponding to the thickness of the core 2) is preferably not more than 5mm, not more than 4mm, not more than 3mm, or not more than 2mm, for example, not less than 0.5mm, from the viewpoint of the flexibility of the core 2. The ratio (D2/D1) of the inner diameter D2 of the winding core 2 to the outer diameter D1 may be less than or equal to 0.95, less than or equal to 0.93 or less than or equal to 0.9, for example, greater than or equal to 0.1.

The packaging film 3 may be, for example, a resin film, a fiber film such as wood pulp, rag pulp, or cotton linter pulp, a metal film such as aluminum foil, or the like, and is preferably a resin film. The resin film may be, for example, a film of a thermoplastic resin. Such a packaging film 3 is suitable for food packaging, medical packaging, odor barrier, moisture barrier, and the like.

The thermoplastic resin may be polyvinyl chloride resin such as polyvinyl chloride; polyvinylidene chloride resins such as polyvinylidene chloride; polyolefin resins such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer saponified products; polystyrene resins such as butadiene-styrene copolymers, acrylonitrile-styrene copolymers, polystyrene, styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, and styrene-acrylic acid copolymers; polyester resins such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; polyamide resins such as 6-nylon, 6-nylon and 12-nylon.

The wrapping film roll 1 is suitable for use as a carrier. In this case, a high degree of odor barrier property is required for the packaging film 3. That is, in the case of using the packaging film 3 outdoors, it is necessary to suppress diffusion of odor more than in the case of using it in a kitchen, for example, and since the packaged body is carried along with other personal belongings, odor transfer from the packaged body to other personal belongings, odor transfer from the outside to the packaged body, and the like are likely to occur, and therefore, the odor barrier property of the packaging film 3 becomes important. In particular, the wrapping film 3 in the wrapping film roll 1 for carrying is desired to be capable of blocking an odor that is not considered when the wrapping film is used in a kitchen or the like, that is, an odor of an article such as a cosmetic, a health care product (for example, a hand cream), a cigarette, or a diaper after use, which is carried together with a packaged body. From the viewpoint of excellent characteristic odor barrier properties required for the packaging film 3 in the packaging film roll 1 for portable use, the thermoplastic resin is preferably a polyvinyl chloride resin, a polyvinylidene chloride resin, or a polyolefin resin, more preferably a polyvinyl chloride resin or a polyvinylidene chloride resin, and still more preferably a polyvinylidene chloride resin.

The polyvinyl chloride resin may be a vinyl chloride homopolymer (polyvinyl chloride) from the viewpoint of excellent mechanical properties, and may be a copolymer of vinyl chloride and another monomer copolymerizable therewith from the viewpoint of imparting other properties. The copolymer may be a graft copolymer, a block copolymer, or a random copolymer. Examples of the other monomer 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; alkyl vinyl ethers such as lauryl vinyl ether; maleic acid, acrylonitrile, styrene, methyl styrene, vinylidene fluoride; and the like. When the polyvinyl chloride-based 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% by mass or more, and more preferably 50% by mass or more, from the viewpoint of excellent mechanical properties. The upper limit of the content of vinyl chloride units in the copolymer is not particularly limited, and may be, for example, 99% by mass or less based on the total amount of monomer units.

The average polymerization degree of the polyvinyl chloride-based resin is preferably 700 or more and 1300 or less from the viewpoint of excellent moldability, heat resistance and fluidity of the film. The average polymerization degree in the present specification means an average polymerization degree measured in accordance with JIS K6720-2.

The polyvinylidene chloride resin may be a vinylidene chloride homopolymer (polyvinylidene chloride), and for example, may be a copolymer containing vinylidene chloride and another monomer copolymerizable with vinylidene chloride as monomer units. The other monomer may be vinyl chloride, acrylic acid ester of acrylic acid and an alcohol having 1 to 8 carbon atoms, methacrylic acid ester of methacrylic acid and an alcohol having 1 to 8 carbon atoms, vinyl ester of aliphatic carboxylic acid, unsaturated aliphatic carboxylic acid, olefin, vinyl ether, or the like. Further, a copolymer of vinylidene chloride and vinyl chloride belongs to a polyvinylidene chloride resin.

The content of the vinylidene chloride unit in the polyvinylidene chloride-based resin may be, 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 moldability and heat resistance of the film. The upper limit of the content of vinylidene chloride units in the polyvinylidene chloride-based 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) apparatus.

The weight average molecular weight of the polyvinylidene chloride-based resin may be, for example, 40000 or more, 60000 or more, or 80000 or more, 180000 or less, 160000 or less, or 140000 or less. The weight average molecular weight of the polyvinylidene chloride resin can be measured by GPC 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. As a measuring apparatus, gel chromatography AllianceGPC2000 model manufactured by Waters corporation was used. A product obtained by dissolving a polyvinylidene chloride resin in tetrahydrofuran so that the content of the resin was 0.5 mass% was used as a sample.

A chromatographic column: TSKgel GMHHR-H (S) manufactured by Tosoh corporation of Tosoh, HT 30cm 2, TSKgel GMH6-HTL 30cm 2

Mobile phase: tetrahydrofuran (THF)

A detector: differential refractometer

Flow rate: 1.0 mL/min

Temperature of the column: 20 deg.C

Sample introduction amount: 500 μ L of

The polyolefin-based resin may be, for example, a homopolymer (polyethylene or polypropylene) of ethylene or propylene, or a copolymer of ethylene or propylene and another monomer copolymerizable therewith, containing ethylene or propylene as a monomer unit. The copolymer may be a graft copolymer, a block copolymer, or a random copolymer.

In the case where the thermoplastic resin is a polyolefin-based resin, for example, the packaging film 3 may be a 3-layer film formed of an intermediate layer and surface layers provided on both sides of the intermediate layer, and in this case, the polyolefin-based resin included in the intermediate layer may be, for example, a polypropylene-based resin including propylene as a monomer unit, and specifically, for example, a propylene homopolymer (polypropylene), a propylene-ethylene random copolymer, a propylene-ethylene- α -olefin random copolymer, a propylene-ethylene-butene random copolymer, a mixture of propylene and an amorphous polyolefin, a copolymer alloy of propylene and an amorphous rubber, or the like.

The content of the ethylene unit in the propylene-ethylene random copolymer is preferably 1% by mass or more and 20% by mass or less based on the total amount of all the monomer units, the content of the ethylene unit and the content of the α -olefin unit in the propylene-ethylene- α -olefin random copolymer are preferably 1% by mass or more and 10% by mass or less, respectively, based on the total amount of all the monomer units, and the total content of the ethylene unit and the butene unit in the propylene-ethylene-butene ternary random copolymer is preferably 1% by mass or more and 20% by mass or less based on the total amount of all the monomer units.

The MFR (Melt Flow Rate) of the polypropylene-based resin contained in the intermediate layer is preferably 0.1g/10 min or more, or 0.5g/10 min or more, 10g/10 min or less, 7g/10 min or less, or 5g/10 min or less. The MFR of the polypropylene resin in the present specification is a value measured at 230 ℃ according to JIS K6921-2.

The polyolefin resin included in the surface layer of the 3-layer film may be, for example, a polyethylene resin including ethylene as a monomer unit, and specifically, may be, for example, high-density polyethylene, low-density polyethylene having a branched structure, linear low-density polyethylene, or ultra-low-density polyethylene. The polyethylene resin is preferably low-density polyethylene, linear low-density polyethylene, or ultra-low-density polyethylene in terms of excellent transparency, and more preferably linear low-density polyethylene in terms of excellent cuttability and adhesion.

The MFR of the polyethylene resin is preferably 0.1g/10 min or 0.5g/10 min or more, 10g/10 min or less, 7g/10 min or less, or 5g/10 min or less. The MFR of the polyethylene resin in the present specification is a value measured at 190 ℃ in accordance with JIS K6922-2.

When the polyethylene resin contains linear low-density polyethylene, the linear low-density polyethylene preferably has a density of 0.900g/cm or more³Or greater than or equal to 0.905g/cm³Less than or equal to 0.925g/cm³Less than or equal to 0.920g/cm³Or less than or equal to 0.915g/cm³. In this case, the polyethylene resin may further contain a polyethylene having a density of 0.910 to 0.950g/cm in addition to the linear low-density polyethylene in order to improve the film-forming property and the surface smoothness of the packaging film 3³The low density polyethylene having a branched structure of (1). In this case, the content of the low-density polyethylene having a branched structure is preferably 5 parts by mass or more per 100 parts by mass of the linear low-density polyethyleneThe amount is less than or equal to 25 parts by mass.

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 packaging film 3 (resin film), from the viewpoint of excellent productivity.

The packaging film 3 (resin film) may further contain other components in addition to the thermoplastic resin. Examples of the other components include an antifogging agent, a heat stabilizer, a light stabilizer, a lubricant, a filler, an antifouling agent, an antioxidant, a mold release agent, a viscosity reducing agent, a surfactant, a colorant, a fluorescent agent, a surface treatment agent, a crosslinking agent, a processing aid, a tackifier, an antistatic agent, an ultraviolet absorber, an antiblocking agent, and the like.

When the thermoplastic resin is a polyvinyl chloride resin or a polyvinylidene chloride resin, the packaging film 3 (resin film) may further contain a plasticizer as another component. Examples of the plasticizer include epoxidized oils such as epoxidized linseed oil, epoxidized soybean oil and epoxidized fatty acid alkyl esters; an adipate having a linear or branched alkyl group having 6 to 10 carbon atoms; hydroxyl polycarboxylic acid esters such as acetyl tributyl citrate and acetyl triethyl citrate; fatty acid dibasic acid esters such as di-n-butyl sebacate, and glycol esters such as pentaerythritol ester and diethylene glycol benzoate; phosphoric acid esters such as triphenyl phosphate and tricresyl phosphate; glycerol diacetylmonolaurate, chlorinated paraffin, a polyester plasticizer, and the like. These plasticizers are used singly or in combination of two or more. The content of the plasticizer may be appropriately adjusted, for example, within a range of 20 to 50 parts by mass per 100 parts by mass of the polyvinyl chloride resin or polyvinylidene chloride resin, depending on the type of the object to be packaged, the packaging form, the packaging method, and other uses.

The packaging film 3 may further contain a red colorant such as quinacridone red, a blue colorant such as copper phthalocyanine (copper phthalocyanine blue) or iron (III) hexacyanoferrate, a yellow colorant such as a mixture of o-nitroaniline and acetoacetanilide or a mixture of 4-chloro-2-nitroaniline and acetoacetanilide, a green colorant such as α -nitroso- β -naphthol iron complex, a purple colorant such as quinacridone violet, and a white colorant such as titanium oxide or zinc oxide, and the packaging film 3 contains the above colorants, whereby the packaging film 3 can be colored and easily distinguish a package from a personal belonging, for example, when carried.

When the packaging film 3 is a resin film, the packaging film 3 may be formed of one layer or a plurality of layers. In the case where the wrapping film 3 is formed of a plurality of layers, the wrapping film 3 may be provided with, for example, a first surface layer, an intermediate layer, and a second surface layer in this order. The packaging film 3 may further include an adhesive layer containing an acid-modified polyolefin resin or the like, for example, in order to improve the adhesiveness between the layers, and may further include a heat-resistant layer containing a polyamide resin in order to improve the heat resistance of the film. In the case where the thermoplastic resin is a polyvinyl chloride-based resin, the packaging film 3 is preferably formed of one layer containing the thermoplastic resin (polyvinyl chloride-based resin) and other components.

The thickness of the packaging film 3 is preferably 50 μm or less, more preferably 20 μm or less, and further preferably 15 μm or less. When the thickness of the packaging film 3 is within this range, the odor barrier property can be further improved, and the amount of the packaging film 3 that can be wound around the core 2 (the length in the winding direction X) can be increased relative to the volume of the packaging film roll 1. When the packaging film 3 is a resin film, it is preferably not more than 12 μm, and more preferably not more than 10 μm from the same viewpoint as described above. The thickness of the packaging film 3 may be, for example, 0.01 μm or more.

The wrapping film roll 1 may be housed in a case (not shown). That is, the packaging film roll 1 and the case that houses the packaging film roll 1 are provided in the packaging film container according to one embodiment. The box body may be provided with a blade for cutting the packaging film.

The packaging film container is manufactured by a manufacturing method including, for example, the steps of: a step of preparing a case, a step of winding the packaging film 3 around the winding core 2, and a step of housing the winding core 2 and the packaging film 3 in a case to obtain a packaging film housing body.

The wrapping film roll 1 described above is suitable for portable use and outdoor use. That is, one embodiment of the present invention is a method of packaging a packaged body outdoors using the packaging film 3 stored in the packaging film roll 1.