JP2713945B2 - Food container packaging method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a container packaging method for sealing a synthetic resin container such as a tray formed by compressed air or vacuum molding with a synthetic resin film. The present invention relates to a method for hermetically sealing a food container in which food such as fresh food is stored.

[Conventional technology]

Conventionally, when a food or the like is stored and packaged in a synthetic resin container manufactured by compressed air or vacuum molding, for example, a tray for meat or fruits and vegetables, the synthetic resin film is wrapped all around and polymerized on the bottom surface. The so-called wrap type in which the film portion is sealed is generally used. On the other hand, it is a very small part, but use a container with the outer fold surface of the upper peripheral edge of the container having a substantially flat surface, apply an adhesive to this outer flat surface, and leave only the container opening surface There has also been an adhesive type in which the film is adhered to the outer flat surface while being closed with the film, and the remaining part is cut off, so to speak, the upper outer surface.

The wrap type is relatively simple in packaging process, but wastes a lot of material in that it covers the entire periphery of the container except for the opening surface, and the wrapped product is wrapped or protruded from the container. However, there is a drawback that the film is often torn by the tensile pressure applied during wrapping and sealing. On the other hand, the adhesive type on the outer side of the upper edge is good for saving materials and preventing tearing of the film. Containers with stacking must be used so that they will not be done, and containers that can be used, such as requiring some strength in the container itself to apply adhesive to the outer flat surface, are limited, Further, there is a drawback that the work of applying the adhesive to the outer flat surface is considerably troublesome, and it is difficult to unify the packaging process into a continuous line.

The present invention is an improvement on the wrapping type packaging method.

[Problems to be solved by the invention]

It eliminates defects such as waste of materials and tearing of the film caused by the conventional wrapping method, and it was difficult to completely hermetically seal the entire container. There is a problem to be solved by the present invention in solving such a problem.

[Means for solving the problem]

The present invention has been developed in order to solve the above-mentioned problems, and at least the surface of the container is mainly composed of a thermoplastic resin and an antibacterial zeolite, and the antibacterial property is based on the total weight of the thermoplastic resin. 0.1 to 5 zeolite
And a food container molded from an antibacterial material in the range of weight%, and a countless porous body made of the same material as the food container and having at least one surface having a thickness of 30 microns, a pore diameter of 0.15 mm, and a hole gap of 0.7 mm. A food container packaging method, wherein a shrinkable film formed by fitting is provided, and the entire surface of the food container is hermetically sealed through the film. A food container packaging method comprising breaking a part and opening the food container.

[Action]

(1) At least the surface of the container is mainly formed of a thermoplastic resin and an antibacterial zeolite, and the antibacterial zeolite is formed of an antibacterial material in a range of 0.1 to 5% by weight based on the total weight of the thermoplastic resin. A food container, comprising the same material as the food container, provided on at least one surface of a shrinkable film having a thickness of 30 microns, a hole diameter of 0.15 mm, and a perforated body having an infinite number of holes having a hole gap of 0.7 mm. Since it is configured to hermetically seal the entire surface of the food container through a film, a sterilizing effect, which is a material characteristic of the container and the film, and a sterilizing effect of the container contents can be obtained by the shrinking effect of the film. The entire container can be completely hermetically sealed.

(2) Since the food container is opened by breaking a part of the shrinkable film that is hermetically sealed, the breakage is easy and easy, which is convenient for edible use.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a method for packaging a food container according to the present invention, wherein (a) is a packed lunch A, (b) is a packed confectionery B,
(C) illustrates three types of packaging cups C. Therefore, as a representative embodiment, a method of packing the lunch box shown in FIG.

The same antimicrobial material is used for the food containers of the package lunch A, the package confectionery B, and the package cup C shown in FIG. That is, the food container 1 of the packed lunch A used in the present invention has at least the surface of the container made of a thermoplastic resin and an antibacterial zeolite, and furthermore, the antibacterial zeolite has a weight of 0.1 to 5 weight based on the total weight of the thermoplastic resin. % Of the antibacterial material. On the other hand, the shrinkable film 2 of the packaging lunch A used in the present invention is made of the same material as the food container, and has a thickness of at least one surface.
It is a shrinkable film formed by innumerably inserting perforated bodies having a diameter of 30 microns, a diameter of 0.15 mm, and a gap of 0.7 mm. Next, a method of packaging the food container 1 using the shrinkable film 2 will be described.

First, rice and side dishes are packed in a lunch box formed of plastic or foamed steel, and the whole lunch box is hermetically sealed with a sheet such as a wrap. This sealing method is performed by a packaging device generally used conventionally. Then, the packed lunch box is sealed in a completely sealed state. In particular, since this sheet is a shrink film, the sealing state is a completely sealed state. Next, a method of peeling the seal will be described with reference to FIG. (A) The method shown in the figure is a method in which a cut tape a is attached to a packaging seal and the package seal is opened via the cut tape a. In FIG. 2B, the lid of the container can be cut simultaneously with the packaging seal. In any case, when a shrink film is used, it is difficult to break or cut it by a normal method if it is hermetically sealed. Therefore, the shrink film is opened by the above-described means.

Further, the material of the packaging seal composed of the shrinkable film used in the packaging method of the present invention will be described with reference to FIGS.

The antibacterial material of the packaging sheet 21 is a thermoplastic resin 22.
And the antibacterial zeolite 23 is in the range of 0.1 to 5% by weight based on the total weight of the thermoplastic resin 22.

The thermoplastic resin 22 can be mixed with the antibacterial zeolite 23 and has properties required as a packaging sheet for food and drink, for example, it can withstand a certain low temperature and high temperature, and has a heat retaining property and a heat retaining property. If there is, there is a certain degree of elasticity, that the food does not smell, and if it is water-resistant and non-toxic,
Anything is fine.

Thermoplastic resin 22, polyethylene, polystyrene, ABS
Resin, thermoplastic resin such as acrylic styrene, polypropylene, ethylene vinyl copolymer, polyvinyl chloride, methacryl, polyamide (nylon), polycarbonate, polyethylene terephthalate, polymethylpentene, fluororesin, polysulfone, oxybenzoyl polyester and polybutene If you can use it. Among them, polyethylene (PE), high density polyethylene (HDPE), polystyrene (PS), and ABS resin are most suitable. However, from the viewpoint of workability, a material having plasticity at a relatively low temperature is preferable. However, there are cases in which a material which is plastic at a high temperature is good depending on the use.

The antibacterial zeolite 23 may be such that some or all of the ion-exchangeable ions of natural zeolite or synthetic zeolite are replaced with antibacterial metal ions, for example, silver, copper, zinc, etc. -181002).

That is, the zeolite is generally aluminosilicate having a three-dimensional skeleton structure, the general formula ^{_{XM 2 / n O · Al 2}} O
Appears as ₃ · YSiO ₂ · ZH ₂ O. Here, M represents an ion-exchangeable ion, usually a monovalent or divalent metal ion,
For example, each ion such as sodium, potassium, magnesium, iron, etc., n is the valence of a metal ion, X is the coefficient of a metal oxide, Y is the coefficient of silica, and Z is the number of molecules of crystallization water. Such general formula ^{_{XM 2 / n O · Al 2}} O 3 · YSiO 2 · ZH
The ion exchange capacity of zeolite represented by ₂ O is 2.6 meq
/ g to 11.5 meq / g. Therefore, the antibacterial zeolite 2
No. 6 is obtained by replacing the ion-exchangeable ion with an antibacterial metal ion, for example, silver, copper, zinc or the like. The antibacterial zeolite 26 desirably contains these antibacterial metal ions in the zeolite in an amount of about 0.1 to 15% by weight (shown on a dry basis at 110 ° C.) in terms of antibacterial properties.

The antibacterial zeolite 23 may be obtained by substituting a part or all of ion-exchangeable ions of natural zeolite or synthetic zeolite with ammonium ions and antibacterial metal ions (Japanese Patent Application No. 61-290144). 1987 of the priority claim under Article 42bis (1) of the Patent Act
(See “Antibacterial zeolite” filed on December 4). The reason why ammonium ions are added in this way is to effectively prevent discoloration of the antibacterial zeolite 23, and it is preferable that the ammonium ions in the antibacterial zeolite 23 be in the range of 0.5 to 2.0% by weight. Further, from the viewpoint of substantially preventing discoloration of the thermoplastic resin 22, the content of the antibacterial zeolite 23 containing the ammonium ion with respect to the thermoplastic resin 22 is preferably 0.1 to 3.0%. .

The antibacterial properties, persistence of antibacterial activity, heat resistance and safety of these two kinds of antibacterial zeolites 23 are described in detail in these publications or application examples.

(Effect of the Invention) Since the present invention is configured as described above, it has the following effects.

A. Since a shrinkable film is used for the packaging material, the food container can be completely hermetically sealed by sealing the entire surface of the food container.

B) Also, since a smooth perforated body having an infinite number of fitting holes is formed inside the film (inside of the container), steam generated when heating or heating the contents of the container flows out of the film. It is easy to come out, and it is difficult for moisture or the like generated on the outside of the film to enter the container, so that it can be stored or eaten without impairing the quality such as the flavor and aroma of the stored items.

C) Since the container and the film are made of a sterile material, not only does the germ not adhere to the inside of the container and the film, but it also has many effects on hygiene, such as preventing the occurrence of food poisoning due to germs. doing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a specific sealing state of the food container packaging method of the present invention, FIG. 2 is a perspective view showing a method of opening the sealing state shown in FIG. FIG. 4 and FIG. 4 are partially enlarged sectional views of the packaging seal used in the present invention. 21 …… Packing sheet 23 …… Antibacterial zeolite A …… Packing lunch B …… Packing confectionery C …… Packing cup

Claims (2)

(57) [Claims] At least the surface of the container is mainly formed of a thermoplastic resin and an antibacterial zeolite, and the antibacterial zeolite is formed of an antibacterial material in a range of 0.1 to 5% by weight based on the total weight of the thermoplastic resin. A food container made of the same material as the food container, and provided on at least one surface with a shrinkable film having a thickness of 30 microns, a hole diameter of 0.15 mm, and a perforated body having an infinite number of holes of 0.7 mm between holes. A method for packaging a food container, wherein the whole surface of the food container is hermetically sealed via the film. 2. A food container is opened by breaking a part of the hermetically sealed shrink film.
The method for packaging a food container according to the above.