JP2002001878A - Heat shrinkable packaging material having antibacterial properties and packaging material applied container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat shrinkable packaging material capable of efficiently suppressing the propagation of bacteria in the gap between an adherend such as a container or the like and the heat shrinkable packaging material. SOLUTION: The heat shrinkable packaging material is constituted of a laminated film wherein an antibacterial coating layer containing a naturally originating antibacterial agent is formed on the outermost surface on the side of the adherend of a heat-shrinkable film. The laminated film may be formed into a cylindrical shape so that the antibacterial coating layer becomes inside. The heat shrinkable packaging material is applied to a container and includes a heat-shrinkable packaging material having the antibacterial coating layer formed to at least the part, which covers the mouth part of the container, thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a heat-shrinkable packaging material such as a heat-shrinkable label or a cap seal having antibacterial properties.
The present invention relates to a packaging material mounting container equipped with the heat shrinkable packaging material.

[0002]

2. Description of the Related Art In recent years, heat-shrinkable films (shrink films) have been used as labels to be attached to food and beverage containers.
A so-called heat-shrinkable label using is widely used. In addition, in order to enhance safety and hygiene, beverage bottles such as milk bottles for home delivery are provided with a secondary cover outside a lid member such as a paper stopper (paper cap) for closing a drinking mouth. A cap seal (cap-shaped cover) for protecting members has been attached.

In a container equipped with such a heat-shrinkable packaging material such as a heat-shrinkable label and a cap seal, the container is usually filled with the contents and then the heat-shrinkable packaging material is attached. In a beverage bottle, the contents that have been scattered or overflowed at the time of filling may be packaged and distributed while being attached to the mouth of the container. In such a case, there is a possibility that bacteria such as bacteria and fungi may grow in the mouth to which the contents are attached. In addition, when the beverage filled in the beverage container with the heat-shrinkable label is not consumed all at once but is consumed in a number of portions, the beverage dripping from the mouth of the container when drinking the beverage is regarded as the container. Bacteria and mold may grow in the infiltrated portion of the beverage between the label and the next consumption.

Japanese Patent Application Laid-Open No. 9-248875 discloses silver,
An antibacterial shrink film in which a transparent ink layer containing a particulate antibacterial agent made of an aluminosilicate incorporating copper or zinc is provided on a shrink film is disclosed, with the transparent ink layer facing outward. It is described that an antibacterial treatment can be applied to the surface of a can, a bottle, and the like by covering the can, the bottle, and the like, and tightly mounting the container by heat shrinkage. However, in such an antibacterial shrink film, since a component containing silver, copper or zinc is used as an antibacterial agent, not only there are problems such as strong toxicity and high price, but also when the antibacterial agent is attached to a container, Since the ink layer containing is located on the outside, it is not possible to sufficiently suppress the growth of bacteria caused by the contents adhering to and seeping into the gap between the container and the label.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat-shrinkable packaging material capable of efficiently suppressing the growth of bacteria in the gap between an adherend such as a container and the heat-shrinkable packaging material. An object of the present invention is to provide a packaging material mounting container on which a shrinkable packaging material is mounted.

Another object of the present invention is to provide a heat-shrinkable packaging material capable of suppressing the growth of bacteria in the mouth of a container, and a packaging material-mounted container provided with the heat-shrinkable packaging material. Still another object of the present invention is to provide a heat-shrinkable packaging material which is highly safe for humans, is inexpensive, and has excellent antibacterial properties, and a packaging material mounting container to which the heat-shrinkable packaging material is mounted. .

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that an antibacterial coating layer containing a specific antibacterial agent is formed on the outermost surface of the heat-shrinkable film on the adherend side. The present inventors have found that the use of the provided heat-shrinkable packaging material has high safety for the human body and can significantly suppress the growth of bacteria between the packaging material and the adherend, thus completing the present invention.

That is, the present invention provides a heat-shrinkable packaging material comprising a laminated film having an antibacterial coating layer containing an antibacterial agent derived from a natural product formed on the outermost surface on the adherend side of the heat-shrinkable film. provide. The laminated film may be formed in a cylindrical shape with the antibacterial coating layer inside. The heat-shrinkable wrapping material may be a heat-shrinkable wrapping material to be attached to a container, wherein a heat-shrinkable wrapping material having an antibacterial coating layer formed on at least a portion covering the mouth of the container. included. The present invention also provides a packaging material mounting container on which the above-mentioned heat shrinkable packaging material is mounted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a laminated film in the heat-shrinkable packaging material of the present invention, and FIG. 2 is a schematic sectional view showing another example of the laminated film. In the example of FIG. 1, a printing layer 2 and an antibacterial coating layer 3 are laminated in this order on the adherend side of the heat-shrinkable film 1. In the example of FIG. 2, the antimicrobial coating layer 3 is laminated on the adherend side of the heat-shrinkable film 1, and the printed layer 2 is laminated on the opposite side.

The heat-shrinkable film 1 may be any plastic film that shrinks by heat, such as a polyester film made of polyethylene terephthalate or the like, a styrene-based film made of a styrene-butadiene block copolymer or the like, or a polypropylene film. Olefin-based films, vinyl chloride resin films and the like can be mentioned. Among these, a polyester film is particularly preferable.

The heat-shrinkable film 1 can be produced, for example, by extruding a resin composition containing a resin constituting the film from a T-die or an annular die, and uniaxially or biaxially stretching the obtained unstretched sheet. . The heat shrinkage of the heat shrinkable film 1 in at least one direction X (main shrinkage direction) is preferably 30% or more from the viewpoint of shrink adhesion to various containers.
More preferably, it is 50% or more. The thickness of the heat-shrinkable film 1 can be appropriately selected in consideration of the handleability of the label and the like, but is usually about 10 to 100 μm, preferably about 2 to 100 μm.
It is about 0 to 60 μm.

An anchor coat layer is provided between the heat-shrinkable film 1 and the print layer 2 or the antibacterial coating layer 3 by a known anchor coat agent or the like, if necessary, in order to enhance the adhesion between the layers. Is also good.

The printing layer 2 is a layer provided with characters and patterns,
For example, it can be formed by a known printing method such as gravure printing. In addition, the printing layer 2 does not necessarily need to be provided.

The antibacterial coating layer 3 contains an antibacterial agent derived from a natural product. Examples of natural product-derived antibacterial agents include shells and shells of clams, oysters, scallops, clams, clams, turban shells, abalones, mussels, and the like, or fired products or hydrates thereof. Extract; plant extracts containing antibacterial components such as wasabi, tea, bamboo, hinoki and the like.

[0015] The fired material of shells and shells is obtained by firing shells and shells at a temperature of, for example, about 500 ° C or more. Can be obtained by The main component of the calcined product of the shell is calcium oxide, and the main component of the hydrate is calcium hydroxide.

The extract can be obtained by a conventional extraction method using water, an acid, an alkali or an organic solvent.
The extract also includes, for example, chitosan obtained by treating chitin such as crustacean shell with an alkali at a high temperature.

In the present invention, since a natural product is used as an antibacterial agent, it is highly safe for the human body.
It is cheaper than antibacterial agents containing silver and the like. In particular, antibacterial agents derived from shells and shells of shellfish are extremely easy to obtain,
Moreover, it is preferable because it has high heat resistance and is hardly deteriorated by heat during heat shrinkage.

The amount of the antibacterial agent in the antibacterial coating layer 3 can be appropriately set according to the degree of antibacterial activity of the antibacterial agent, but is usually about 3 to 30% by weight. The thickness of the antibacterial coating layer 3 is, for example, about 3 to 20 μm, and preferably about 5 to 10 μm. Antibacterial coating layer 3
Is preferably formed in a state where an antibacterial agent is exposed on the surface in order to enhance antibacterial properties.

The antimicrobial coating layer 3 can be formed by dissolving or dispersing the antimicrobial agent in a printing ink or varnish and using a conventional printing method or coating method such as gravure printing. When the antibacterial agent is insoluble in printing ink or the like, it has an appropriate particle size (for example, an average particle size of 100 μm).
m or less, preferably 50 μm or less, particularly preferably 20 μm or less.
(μm or less).

Known or commonly used printing inks and varnishes can be used. For example, as a resin for printing ink or varnish, acrylic resin, polyester resin,
Polyamide resin, vinyl chloride-vinyl acetate copolymer, butyral resin, nitrocellulose, ethylcellulose,
Ethyl hydroxyethyl cellulose, chlorinated polypropylene, urea resin, melamine resin, ketone resin, cyclized rubber, chlorinated rubber and the like can be used. In addition, solvents used for inks and varnishes include aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, alcohols, esters, ketones, glycols, glycol ethers, glycol ether esters, water, and mixed solvents thereof. Is mentioned. Also, pigments that are usually used can be used. In particular, in the case where burned shells or the like are used as the antibacterial agent, they generally have a white color, so that they can be used without any problem in tint and the like by mixing and printing in white ink containing a white pigment.

The concentration of the antibacterial agent in the coating solution is as follows:
It can be appropriately selected within a range that does not impair applicability and the like, and varies depending on the type of antibacterial agent, but is usually about 0.1 to 30% by weight,
Preferably, it is about 0.5 to 15% by weight.

The antibacterial coating layer 3 can also be formed by coextrusion or extrusion coating using a resin composition containing an antibacterial agent and a binder resin. As the binder resin, for example, polyethylene, polyolefin resin such as polypropylene, polyester resin such as polyethylene terephthalate, vinyl chloride resin,
A thermoplastic resin such as a styrene-based resin may be used.

The antibacterial coating layer 3 may be formed on the entire surface of the film or may be formed partially. When the adherend is a container, at least the mouth of the container is required. It is preferably formed at the portion to be covered.

The shape of the laminated film can be appropriately selected and set according to the application, but a tubular (tube-shaped) film having the antibacterial coating layer 3 inside is often used. The cylindrical laminated film may be either a seamless film or a film formed by rolling a sheet material into a cylindrical shape and bonding the terminal end with a solvent, an adhesive, heat or the like.

The heat-shrinkable wrapping material of the present invention can be constituted not only by the laminated film, but also by the laminated film and other members. For example, the cylindrical laminated film can be used as a heat-shrinkable label mainly attached to a body such as a container. Further, the cylindrical laminated film can constitute a flared portion (flared side wall portion) of a cap seal to be attached to a mouth portion (a drinking mouth) of a container such as a milk bottle.

FIG. 3 is an explanatory view showing a process of attaching a heat-shrinkable label, which is an example of the heat-shrinkable packaging material of the present invention, to a container. The heat-shrinkable label 10 is made of the cylindrical laminated film, and is externally fitted to a container 11 (for example, a plastic or glass bottle-shaped container such as a polyethylene terephthalate bottle). And can be attached to the container 11 by heat shrinkage.

In the thus obtained container with a heat-shrinkable label, an antibacterial coating layer is provided on the outermost surface of the heat-shrinkable label 10 on the adherend side, so that the beverage or the like filled in the container 11 can be consumed. Even if a beverage or the like hangs down from the mouth of the container 11 and penetrates into the gap between the container 11 and the label 10, it is possible to suppress the growth of bacteria and mold from the site. Therefore, safety and hygiene can be maintained even when a beverage or the like is divided and consumed many times.

FIG. 4 is an explanatory view showing a step of attaching a cap seal as another example of the heat-shrinkable packaging material of the present invention to a container. The cap seal 20 is a flared portion (flared side wall portion) composed of a disc-shaped top plate 20a and the cylindrical laminated film.
20b.

The top plate 20a is made of a plastic sheet (for example, a styrene resin sheet,
It can be manufactured by punching a polyester resin sheet such as polyethylene terephthalate, a polyolefin resin sheet, or a laminate thereof into a circular shape having a desired size. The cap seal 20, the top plate 20a is placed on the flat top of a molding die having a shape corresponding to the shape of the target cap seal, the cylindrical laminated film is inserted into the molding die, and thermally shrunk by heating. Forming a flare portion 20b,
Next, a donut-shaped heat seal bar is pressed from above against the flat portion of the laminated film bent to the surface peripheral portion of the top plate 20a due to the heat shrinkage, and the top plate 20a and the laminated film are bonded and integrated. It can be manufactured by doing.

The cap seal 20 thus manufactured is
The lid is fitted with a mouth (a drinking spout) of a glass-made beverage bottle 21 (for example, a milk bottle or the like) filled with contents (beverage) and whose mouth is closed by a lid member such as a paper cap. By covering the member and passing through a steam tunnel or a hot air tunnel at a predetermined temperature to thermally shrink the flare portion 20b, the flare portion 20b can be attached to the beverage bottle 21.

In the thus obtained container such as a beverage bottle with a cap seal, since the antibacterial coating layer is provided on the outermost surface of the laminated film constituting the flare portion 20b on the adherend side, the container is filled with the contents. Even if the contents are scattered or overflowed and adhered to the mouth (drink) of the container and covered with the cap seal, the growth of bacteria and mold on the attached parts of the contents is suppressed. it can. Therefore, safety and hygiene of a beverage bottle and the like can be secured.

The heat-shrinkable packaging material of the present invention is not limited to the above-described heat-shrinkable label and cap seal, but can also be used as an overlap packaging material for covering cup noodle containers and the like, and a P-sealing packaging material. Also, the material of the adherend is not particularly limited, and the present invention can be applied to a wide range of adherends made of plastic, glass, metal, wood, and the like.

[0033]

According to the present invention, an antibacterial coating layer containing a specific antibacterial agent is formed on the outermost surface of the heat-shrinkable film on the side of the adherend, so that the heat-shrinkable film and the adherend such as a container can be heat-shrinkable. Bacterial growth in the gap with the packaging material can be efficiently suppressed. In particular, when an antibacterial coating layer is formed on a portion covering the mouth (mouth), the growth of bacteria in the mouth (mouth) of the container can be suppressed, and safety and hygiene are improved. it can. Furthermore, the heat-shrinkable packaging material of the present invention has high safety for humans and is inexpensive.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a laminated film in a heat-shrinkable packaging material of the present invention.

FIG. 2 is a schematic sectional view showing another example of a laminated film in the heat-shrinkable packaging material of the present invention.

FIG. 3 is an explanatory view showing a step of attaching a heat-shrinkable label, which is an example of the heat-shrinkable packaging material of the present invention, to a container.

FIG. 4 is an explanatory view showing a step of attaching a cap seal as another example of the heat-shrinkable packaging material of the present invention to a container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-shrinkable film 2 Printing layer 3 Antibacterial coating layer 10 Heat-shrinkable label 11 Container 20 Cap seal 20a Top plate 20b Flare part 21 Container (beverage bottle)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65D 71/08 B65D 71/08 A 81/28 81/28 A F term (Reference) 3E067 AA03 AB26 BA03A BA21C BB08A BB14A BB14C BC03A BC03C CA01 EE04 FB01 FC02 GC05 3E086 AA22 AB03 AD16 BA04 BA15 BA24 BB67 BB90 CA11 4F100 AJ00B AK42 BA02 CA30B CC00B DA04 DA11 EH20 EJ38 GB15 GB16 GB90 JA03A JC00B

Claims (4)

[Claims] 1. A heat-shrinkable packaging material comprising a laminated film in which an antibacterial coating layer containing an antibacterial agent derived from a natural product is formed on the outermost surface on the adherend side of the heat-shrinkable film. 2. The heat-shrinkable packaging material according to claim 1, wherein the laminated film is formed in a tubular shape with the antibacterial coating layer inside. 3. The heat-shrinkable packaging material according to claim 1, wherein the heat-shrinkable packaging material is mounted on a container, and an antibacterial coating layer is formed on at least a portion covering the mouth of the container. 4. A packaging material mounting container on which the heat-shrinkable packaging material according to claim 1 is mounted.