JP2021185093A - Packaging bag - Google Patents

Abstract

To provide a packaging bag for storing a hair color agent as a content, having a gas barrier property, resistance against a strong basic content, and softness as a packaging bag.SOLUTION: A packaging bag can store a hair color agent containing monoethanolamine as a content, and is formed by bag-forming a laminate having a plastic film as a substrate. The laminate is composed by laminating a substrate film layer, a gas barrier layer, a surface modification layer, an extruded resin layer and a sealant layer in this order from a bag outside. The substrate film layer is formed of polybutylene terephthalate resin, the gas barrier layer is formed of metal leaves, and a loop stiffness of the laminate is 100 mN or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag. In particular, it relates to a packaging bag that can store contents containing monoethanolamine such as a hair coloring agent inside, and in this case, it can withstand use under high temperature conditions of 50 ° C. or higher, and the contents on the base material layer. A packaging bag that is capable of preventing permeation, does not affect the appearance due to pinholes in the barrier layer, or deteriorates in the barrier layer, and is flexible and suitable for a filling machine. It is a thing.

In addition to its convenience and design, many types of packaging bags have been put into practical use according to the contents and usage environment. Particularly in recent years, packaging bags formed from a laminate having a sealant layer using a plastic film as a base film and capable of satisfying a required function have been commercialized in various fields.

In general, the role of packaging bags is to protect the contents from the external environment and external forces. In addition, the environment in which it is used varies, and the entire packaging bag may be heated, and suitability in each case is required. It goes without saying that it is required to prevent the contents from leaking to the outside, and in some cases, it is of utmost importance to prevent the odor from seeping out and leaking to the outside, especially for the contents having a strong odor.

For example, hair coloring agents for dyeing hair have a strong odor because they contain strong basic substances such as monoethanolamine and ammonia in the components of the chemical solution containing dyes, so they are resistant to the contents and also have gas barrier properties. Often required.

That is, since the contents of the packaging bag for storing the hair coloring agent are strongly basic, when a metal foil such as aluminum foil is used as the gas barrier layer, the metal foil is corroded due to the exudation of the contents and it. It is necessary to prevent the occurrence of poor appearance and the decrease in peel strength between the layers of the laminated body. Furthermore, it is also necessary to ensure the durability and peel strength of the components of the laminate constituting the packaging bag, such as preventing deterioration of the plastic film itself.

As a method for achieving both gas barrier properties and strong basic resistance, Patent Document 1 proposes a packaging bag in which aluminum foil is subjected to chemical conversion treatment to suppress corrosion of the aluminum foil. Further, in Prior Document 2, a proposal is made for a packaging bag using a laminated body using aluminum foil as a gas barrier layer, and a proposal for solving the problem by providing an extruded layer of a thermoplastic resin in order to improve the peel strength of the laminated body. Has been made.

However, in any case, the hard aluminum foil layer and the thermoplastic resin layer are laminated adjacent to each other in the laminated body, and the thickness of the laminated body becomes thick due to the provision of the intermediate base material layer. Along with this, the waist strength of the laminated body becomes stronger, and the flexibility becomes poor.

As a result, for example, the resistance at the time of half-folding in the filling process increases, the heat is not easily transferred to the sealant layer at the time of heat fusion, and as a result, the sealing temperature becomes high and the melting point of the material is approached. The suitability in the filling process is insufficient, and there are problems such as meandering of the laminated body and poor appearance.

Japanese Patent No. 5584970 Japanese Unexamined Patent Publication No. 2003-81285.

The present invention has been made in view of the above circumstances, and the content thereof is a hair coloring agent having gas barrier properties, resistance to strongly basic contents, and flexibility as a packaging bag. The subject is to provide a packaging bag that can be stored.

The invention according to claim 1 is a means for solving the above problems.
A packaging bag that can store a hair coloring agent containing monoethanolamine as its contents.
The packaging bag is formed by making a laminated body based on a plastic film.
The laminate is composed of a base film layer, a gas barrier layer, a surface modification layer, an extruded resin layer, and a sealant layer that are sequentially laminated from the outside of the packaging bag.
The base film layer is made of polybutylene terephthalate resin and is made of polybutylene terephthalate resin.
The gas barrier layer consists of metal leaf
It is a packaging bag characterized in that the loop stiffness strength of the laminated body is 100 mN or less.

Further, the invention according to claim 2 is based on the invention.
The packaging bag according to claim 1, wherein the surface-modified layer comprises an inorganic coating containing Zr, Cr or a salt thereof, and an organic polymer coating covering the inorganic coating.

The invention according to claim 3 is characterized in that the base film layer is made of a biaxially stretched polybutylene terephthalate resin having a thickness of 15 μm or more and 25 μm or less. It is a packaging bag described in.

Further, the invention according to claim 4 is the invention.
The packaging bag according to any one of claims 1 to 3, wherein the gas barrier layer is a foil made of aluminum or an aluminum alloy having a thickness of 5 μm or more and 50 μm or less.

Further, the invention according to claim 5 is
The extruded resin layer is formed by extruding low-density polyethylene or anhydrous maleic acid graft-polymerized polyethylene having a thickness of 10 μm or more and 35 μm or less, or by co-extrusion of low-density polyethylene and anhydrous maleic acid graft-polymerized polyethylene. The packaging bag according to any one of claims 1 to 4, characterized in that.

Further, the invention according to claim 6 is based on the invention.
The packaging bag according to any one of claims 1 to 4, wherein the extruded resin layer is made of a thermoplastic polyethylene resin having a thickness of 15 μm or more and 30 μm or less.

Further, the invention according to claim 7 is based on the invention.
The packaging bag according to any one of claims 1 to 6, wherein the sealant layer has a thickness of 20 μm or more and 100 μm or less.

According to the present invention, it is possible to provide a packaging bag that can store a hair coloring agent as a content, which has a gas barrier property and has both resistance to a strongly basic content and flexibility as a packaging bag. It is possible.

That is, the packaging bag is formed by making a laminate based on a plastic film, and the laminate is formed from the outside of the packaging bag, such as a substrate film layer, a gas barrier layer, a surface modification layer, an extruded resin layer, and a sealant. Since the layers are sequentially laminated, it is possible to seal the contents after filling them, and it is also possible to fill the contents by, for example, an automatic filling machine.

By adopting a polybutylene terephthalate resin whose SP value is different from that of the contents, the base film layer can reduce the thickness of the laminated body, and has excellent resistance and filling suitability. It is possible to make them compatible. Further, since the polybutylene terephthalate film is also excellent in pinhole resistance, it is also effective in improving the storage suitability after filling.

Since the gas barrier layer is made of a metal foil, it is possible to maintain a high level of gas barrier property.

Further, the laminate according to the present invention can have a loop stiffness strength of 100 mN or less, whereby the packaging bag can be sufficiently flexible and can satisfy the suitability for a filling machine.

Further, in particular, according to the invention of claim 2, the surface modification layer is a gas barrier made of a metal foil by being composed of an inorganic film containing Zr, Cr or a salt thereof and an organic polymer film covering the inorganic film. It is effective in improving the adhesiveness of the layer with the resin layer, and is effective in improving the interlayer strength of the laminated body.

Further, in particular, according to the invention of claim 3, the base film layer is made of a biaxially stretched polybutylene terephthalate resin having a thickness of 15 μm or more and 25 μm or less, thereby increasing the flexibility of the laminated body (10). It can be ensured, and it is more effective in improving the storage suitability after filling by achieving both the resistance to the contents and the suitability for the filling machine without adversely affecting the suitability for the filling machine.

Further, in particular, according to the invention of claim 4, the gas barrier layer is a foil made of aluminum or an aluminum alloy having a thickness of 5 μm or more and 50 μm or less, thereby ensuring sufficient gas barrier properties at a high level. It is possible to achieve both flexibility as a laminated body and a loop stiffness strength of 100 mN or less.

In addition, aluminum or aluminum alloy is generally a material that is stable in price and easily available, has sufficient flexibility in the state of foil, is easy to laminate, and can be used as a packaging bag. Has aptitude.

Further, according to the invention of claim 5, the extruded resin layer is made of low-density polyethylene having a thickness of 10 μm or more and 35 μm or less by extruding low-density polyethylene or maleic anhydride-grafted polymerized polyethylene, or low-density polyethylene and malean anhydride. By co-extruding with the acid graft polymerized polyethylene, it is possible to directly form the laminated body without providing the adhesive layer on the surface modification layer of the gas barrier layer.

Further, according to the invention of claim 6, the extruded resin layer is made of a thermoplastic polyethylene resin having a thickness of 15 μm or more and 30 μm or less, so that the adhesive layer and the sealant layer are laminated with the extruded resin layer. It is effective in improving the adhesiveness when performing.

Further, according to the invention of claim 7, the sealant layer has a thickness of 20 μm or more and 100 μm or less, so that sufficient sealing property can be ensured, and the sealing property in bag making can be improved. It can be secured and is effective in improving the sealing property of the contents after filling the contents.

FIG. 1 is a partial cross-sectional schematic diagram for explaining an embodiment of a laminate forming a packaging bag according to the present invention. FIG. 2 is another embodiment of the laminate forming the packaging bag according to the present invention, and is a partial cross-sectional schematic diagram for explaining Example 1.

Hereinafter, the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited to the examples shown here. The present invention is specified by the claims.

FIG. 1 is a partial cross-sectional schematic diagram for explaining an embodiment of a laminate forming a packaging bag according to the present invention.

The packaging bag according to the present invention is a packaging bag that can store a hair coloring agent containing monoethanolamine as a content.

This packaging bag is formed by making a laminate (10) using a plastic film as a base material. In general, hair coloring agents discolor when exposed to oxygen, and the metal is corroded by strong alkali. Therefore, pinholes are generated and the discoloration and appearance are poor. Is required to have special resistance and material composition corresponding to the contents.

In the present invention, the structure of the laminated body (10) is such that the base film layer (1), the gas barrier layer (2), the surface modification layer (3), the extruded resin layer (4), and the sealant layer (from the outside of the packaging bag). 5) are sequentially laminated, and the base film layer (1) is made of a polybutylene terephthalate resin, and the gas barrier layer (2) is made of a metal foil.

Further, the present invention is characterized in that the loop stiffness strength of the laminated body (10) is 100 mN or less. That is, it is possible to provide a packaging bag in which the laminated body (10) has resistance to the contents and at the same time has flexibility and can be compatible with the filling machine.

For the base film layer (1), polybutylene terephthalate, which has an SP value separated from that of monoethanolamine, which is the main component of the content, has excellent mechanical strength, and is also excellent in resistance to the generation of pin poles, is adopted. This makes it possible to reduce the thickness of the laminate (10), improve the flexibility of the packaging bag, and improve the suitability for the filling machine without impairing the resistance to the contents.

In particular, the base film layer can be a biaxially stretched polybutylene terephthalate resin having a thickness of 15 μm or more and 25 μm or less, and in this case, the flexibility of the laminated body (10) can be ensured. It is possible to achieve both resistance to the contents and suitability for the filling machine without adversely affecting the suitability for the filling machine, and to further improve the storage suitability after filling.

The base film layer (1) and the gas barrier layer (2) can be laminated, for example, via an adhesive layer.

Further, since the gas barrier layer (2) is made of a metal foil, the gas barrier property can be ensured at a high level, while by adopting polybutylene terephthalate for the base film layer (1) as described above. It is also possible to achieve both pinhole generation and suitability for filling machines.

In particular, the gas barrier layer (2) can be a foil made of aluminum or an aluminum alloy having a thickness of 5 μm or more and 50 μm or less. In this case, both the flexibility of the laminated body (10) and the gas barrier property are achieved. It is more effective.

In the present invention, the surface modification layer (3) is composed of an inorganic film containing Zr, Cr or a salt thereof, and an organic polymer film covering the inorganic film. This is because the gas barrier layer (2) uses a foil made of metal, and the adhesiveness with the extruded resin layer (4) and the sealant layer (5) is improved, and at the same time, the interlayer strength as a laminated body (10) is improved. It is provided on the surface of the metal foil of the gas barrier layer (2).

Further, the extruded resin layer (4) can be a thermoplastic polyethylene resin having a thickness of 15 μm or more and 30 μm or less, and the extruded resin layer (4) improves the adhesiveness when laminating the sealant layer (5). It is more effective. At this time, an adhesive layer can be provided between the surface modification layer (3) of the gas barrier layer (2) and the extruded resin layer (4), which is more effective in improving the interlayer strength of the entire laminated body (10). be.

The extruded resin layer (4) is made by extruding low-density polyethylene or maleic anhydride graft-polymerized polyethylene having a thickness of 10 μm or more and 35 μm or less, or by co-extrusion of low-density polyethylene and maleic anhydride graft-polymerized polyethylene. Can be. In this case, the extruded resin layer (4) is formed and the laminated body (10) forming the packaging bag is formed without providing the adhesive layer on the surface modification layer (3) of the gas barrier layer (2). Is possible.

The sealant layer (5) can have a thickness of 20 μm or more and 100 μm or less. In this case, it is necessary to achieve both flexibility and filling suitability of the laminated body (10) while ensuring sufficient sealing properties. It is effective.

In the sealant layer (5), two laminated bodies (10) are laminated so that the sealant layers (5) face each other, and the sealant layers (5) are heated and pressurized to be heat-sealed to adhere to each other, and the sealant layer (5) is made into a packaging bag. Allows you to do.

As the material of the sealant layer (5), a polyolefin-based resin is generally used among the thermoplastic resins, specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), and linear low. Ethylene-based resins such as density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, ethylene-methacrylic acid resin copolymer, blended resin of polyethylene and polybutene, and Polypropylene-based resins such as homopolypropylene resin (PP), propylene-ethylene random copolymer, propylene-ethylene block copolymer, and propylene-α-olefin copolymer can be used.

To form the sealant layer (10), a molten resin can be formed by using an extruder or the like to form a layer on the laminated body (10). Alternatively, it is also possible to form a sealant layer on the surface of the laminated body (10) by laminating a material that has been formed into a film state in advance by laminating.

A layer that can be seen from the outside of the packaging bag in the laminate (10) using a plastic film as a base material for the purpose of improving the image as a product, displaying necessary information about the contents, and improving the design as necessary. A print layer can be provided on the surface. The printing layer may be provided on the outermost layer of the packaging bag.

Here, the printing method and the printing ink are not particularly limited, but the printability on the plastic film, the design such as the color tone, the adhesion, the safety, etc. are taken into consideration from the known printing methods. It may be selected as appropriate.

For example, it can be selected from known printing methods such as a gravure printing method, an offset printing method, a gravure offset printing method, a flexo printing method, a silk screen printing method, and an inkjet printing method. Above all, the gravure printing method can be preferably used in terms of productivity, printability on a plastic film, and high definition of a pattern.

If necessary, a printing layer can be provided on the laminated body (10), and a base material having a light-shielding layer can be attached to the laminated body (10).

As described above, according to the present invention, a package capable of storing a hair coloring agent as a content, which has gas barrier properties and has both resistance to strongly basic contents and flexibility as a packaging bag. Bags can be provided.

Hereinafter, the present invention will be described in more detail with reference to Examples 1 to 2 and Comparative Examples 1 to 3. However, the present invention is not limited to the examples shown here. The present invention is specified by the claims.

A laminated body having a barrier property was prepared, laminated with a base material having a light-shielding layer with a urethane-based adhesive, and evaluated as a sample. Also, using this, a packaging bag was prepared, and the contents were filled and evaluated.

The evaluation items are as follows.
-Pinhole resistance evaluation-Loop stiffness strength evaluation-Content resistance evaluation The evaluation methods for each evaluation item are as follows.

Pinhole resistance evaluation Using a gelboflex tester (manufactured by Tester Sangyo Co., Ltd.), the pinhole resistance was counted at room temperature and 1000 times.

Loop Stiffness Strength Evaluation Using a loop stiffness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.), the strength was confirmed under the conditions of a width of 15 mm, a circumference of 50 mm, and a pushing amount of 10 mm.

Evaluation of content resistance Physical characteristics Two rectangular samples were stacked with the sealants facing each other, and the three sides were sealed to form a three-sided bag. As the content, one hair color agent having a pH of 9 to 10 (main component: monoethanolamine, SP value 16.3) was filled and sealed.
After bending this sample 100 times in a normal temperature environment, it was stored in a constant temperature bath at 50 ° C., and after 2 weeks, it was taken out and the appearance was observed.

<Example 1>
FIG. 2 is another embodiment of the laminate forming the packaging bag according to the present invention, and is a partial cross-sectional schematic diagram for explaining Example 1.

The laminated body (10) having a barrier property has the following configuration.
From the outside of the packaging bag,
-Base film layer (1) Polybutylene terephthalate film (Kohjin Film & Chemicals Co., Ltd. Boblet (registered trademark) ST thickness 15 μm) /
-Adhesive layer (7) Urethane-based adhesive (main agent: Takelac (registered trademark) A525 manufactured by Mitsui Chemicals, Inc., curing agent: Takenate (registered trademark) A50 manufactured by Mitsui Chemicals, Inc.) /
・ Gas barrier layer (2) Aluminum foil (8079 material manufactured by Toyo Aluminum Co., Ltd., thickness 9 μm) /
-Surface modified layer (3) Zr-based coating agent (Nippon Paint Surf Chemicals Co., Ltd. Surf Coat (registered trademark) EC1000A / B) /
・ Adhesive layer (6) Adhesive containing the biuret type of hexamethylene diisocyanate as the main component /
・ Extruded resin layer (4) Low density polyethylene (LC600A manufactured by Japan Polyethylene Corporation) /
-Sealant layer (5) Linear low-density polyethylene resin (LL-MTNST manufactured by Futamura Chemical Co., Ltd.)
A laminated body having the layer structure of was created.
Further, a base material having a light-shielding layer was attached to this laminated body using a urethane-based adhesive.

<Example 2>
Compared to Example 1, instead of the adhesive layer (6) and the extruded resin layer (4), maleic anhydride graft-polymerized polyethylene (manufactured by Mitsubishi Chemical Corporation, melting point peak: 98 ° C., density 0.88 g / cm ³ MFR: 10 g) Examples except that a co-extruded layer of low-density polyethylene resin (LC600A manufactured by Japan Polyethylene Corporation) was formed, and after extrusion lamination, the film was heated at 140 ° C. for 15 seconds with a heater roll to form a laminated film. It was the same as 1.

<Comparative Example 1>
Example 1 was the same as that of Example 1 except that a polyethylene terephthalate film (FE2001, thickness 12 μm manufactured by Futamura Chemical Co., Ltd.) was used as the base film layer (1).

<Comparative Example 2>
Same as Example 1 except that a stretched polyamide film (Bonil (registered trademark) RX thickness 15 μm manufactured by Kohjin Film & Chemicals Co., Ltd.) was used as the base film layer (1). did.

<Comparative Example 3>
A polyethylene terephthalate film (FE2001, 12 μm thick, manufactured by Futamura Chemical Co., Ltd.) was used as the base film layer (1) with respect to Example 1, and between the base film layer (1) and the gas barrier layer (2). The same as in Example 1 was carried out except that a stretched polyamide film (Bonil (registered trademark) W thickness 15 μm manufactured by Kohjin Film & Chemicals Co., Ltd.) was laminated as an intermediate base material layer.

The evaluation results are shown in Table 1.

As can be seen from Table 1, in both Example 1 and Example 2 according to the present invention, the number of pinholes generated is smaller than that of Comparative Examples 1 to 3 in the evaluation of pinhole resistance.

Further, in the evaluation of the loop stiffness strength, both Example 1 and Example 2 have values satisfying 100 mN or less specified in the present invention. As a result, the laminated body has flexibility and can be suitable for a filling machine.

These show the effect of using the polybutylene terephthalate film (Kohjin Film & Chemicals Co., Ltd. Boblet (registered trademark) ST thickness 15 μm) specified in the present invention for the base film layer (1). Conceivable.

In Comparative Example 1, as a result of using a polyethylene terephthalate film (FE2001 thickness 12 μm manufactured by Futamura Chemical Co., Ltd.) for the base film layer (1) outside the range specified in the present invention, the pinhole resistance is inferior. The result is.

In Comparative Example 2, a stretched polyamide film (Bonil (registered trademark) RX thickness 15 μm manufactured by Kohjin Film & Chemicals Co., Ltd.) is used for the base film layer (1) beyond the range specified in the present invention. Since the SP value is close to that of monoethanolamine, which is the main component of the contents, partial discoloration (brown spots) is observed after storage at 50 ° C in the content resistance evaluation, which is a practical problem as a packaging bag. ..

In Comparative Example 3, a polyethylene terephthalate film (FE2001 thickness 12 μm manufactured by Futamura Chemical Co., Ltd.) was used as the base film layer (1), and between the base film layer (1) and the gas barrier layer (2). As a result of laminating a stretched polyamide film (Bonil (registered trademark) W thickness 15 μm manufactured by Kojin Film & Chemicals Co., Ltd.) as an intermediate base material layer, the thickness of the entire laminate is increased and the loop steffinity strength is defined in the present invention. It is larger than 100 mN, and it lacks flexibility, and there is a risk that it will not be compatible with filling machines as packaging bags.

As described above, according to the present invention, a packaging bag capable of storing a hair coloring agent as a content, which has gas barrier properties and has both resistance to strongly basic contents and flexibility as a packaging bag. We were able to verify that it is possible to provide.

1 ... Base film layer 2 ... Gas barrier layer 3 ... Surface modification layer 4 ... Extruded resin layer 5 ... Sealant layer 6 ... Adhesive layer 7 ... Adhesive layer 10・ ・ ・ Laminated body

Claims (7)

A packaging bag that can store a hair coloring agent containing monoethanolamine as its contents.
The packaging bag is formed by making a laminated body based on a plastic film.
The laminate is composed of a base film layer, a gas barrier layer, a surface modification layer, an extruded resin layer, and a sealant layer that are sequentially laminated from the outside of the packaging bag.
The base film layer is made of polybutylene terephthalate resin and is made of polybutylene terephthalate resin.
The gas barrier layer consists of metal leaf
A packaging bag characterized in that the loop stiffness strength of the laminated body is 100 mN or less. The packaging bag according to claim 1, wherein the surface-modified layer comprises an inorganic coating containing Zr, Cr or a salt thereof, and an organic polymer coating covering the inorganic coating. The packaging bag according to claim 1 or 2, wherein the base film layer is made of a biaxially stretched polybutylene terephthalate resin having a thickness of 15 μm or more and 25 μm or less. The packaging bag according to any one of claims 1 to 3, wherein the gas barrier layer is a foil made of aluminum or an aluminum alloy having a thickness of 5 μm or more and 50 μm or less. The extruded resin layer is formed by extruding low-density polyethylene or anhydrous maleic acid graft-polymerized polyethylene having a thickness of 10 μm or more and 35 μm or less, or by co-extrusion of low-density polyethylene and anhydrous maleic acid graft-polymerized polyethylene. The packaging bag according to any one of claims 1 to 4, wherein the packaging bag is characterized by the above. The packaging bag according to any one of claims 1 to 4, wherein the extruded resin layer is made of a thermoplastic polyethylene resin having a thickness of 15 μm or more and 30 μm or less. The packaging bag according to any one of claims 1 to 6, wherein the sealant layer has a thickness of 20 μm or more and 100 μm or less.

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