JP2899904B2 - Packaging container and manufacturing method thereof - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for producing a packaging container, and more particularly to a food which is heated by a microwave oven together with the container, a food which excludes liquid in the packaging, a seasoning, The present invention relates to a method for producing a packaging container suitable for packaging food such as spices, or for packaging non-food such as insect repellents, fragrances, deodorants and the like.

[Conventional technology]

2. Description of the Related Art When a food packaged with a film using a synthetic resin film or a metal foil is heated in a microwave oven, various methods have conventionally been used in order to prevent an increase in internal pressure in the package due to steam generated during cooking. For example, in the case of a tray-type container that stores retort-sterilized cooked rice, etc.,
At the time of cooking in a microwave, a part of the lid material is peeled off, several holes are opened with a toothpick or the like, or the entire lid material is peeled off and another fitting lid is put on.

As a non-food product, for example, tablets containing an insect repellent are individually packaged in a gas-permeable packaging material such as a nonwoven fabric, and a plurality of the tablets are collectively packaged in a barrier packaging material. In some cases, the function of the storage portion is exerted by peeling or making a cut in a part.

[Problems to be solved by the invention]

However, if the lid material of the microwave oven food container is partially peeled off, moisture will evaporate more from this part, causing uneven cooking, and tools are needed to make holes in the lid material. Yes, and if the hole is insufficiently drilled,
During cooking, there is a danger that the pressure in the container will rise and burst. In the case of using the fitting lid, there is a problem in terms of packaging material cost.

In addition, foods that are filled and packaged with liquids, such as boiled heaven, konjac, tofu, and beans, need to be drained when eaten. Content food may be spilled.

Also, in non-food products such as the insect repellent, if the peeling of the barrier film of the packaging material is troublesome, or if the cuts or the formation of the through holes in the packaging material are uneven, the predetermined performance may not be exhibited. Was.

Therefore, an object of the present invention is to provide a method of manufacturing a packaging container provided with a lid material suitable for packaging various foods and non-foods that need to be provided with air permeability or water permeability during use.

[Means for solving the problem]

In order to achieve the above object, the packaging container of the present invention is a laminate in which a heat-resistant base film that does not melt at the heat sealing temperature and a perforated film having through holes are bonded with a peelable adhesive strength. When heat-sealing the container opening flange with the perforated film of the film inside to form a lid, a knob is formed on at least a part of a peripheral portion of the lid, and a heat-sealing portion of the knob is formed. The perforated film, characterized by forming a thin portion to trigger the peeling from the base film, and the manufacturing method, the laminated film is heat-sealed with a heat seal bar to the container opening flange portion. When forming a lid, at least a part of a peripheral portion of the lid is formed with a knob, and at the same time, the perforated film at a heat sealing portion of the knob is heat-sealed. Is characterized in that the thin-walled at over.

Using the laminated film configured as described above as a container lid material,
By peeling the base film from the perforated film immediately before use, only the perforated film can be left as a lid material of the container, and the lid material can be given appropriate air permeability and water permeability. In addition, when the laminated film is heat-sealed to the flange of the container, a knob is provided, and the thin film is subjected to heat-sealing of the perforated film at the heat-sealed portion so that the thin-walled portion starts to peel off the base film. And the base film can be easily peeled off from the perforated film.

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

1 to 4 show an embodiment of the packaging container of the present invention, FIG. 1 is a cross-sectional view of the packaging container, FIG. 2 is a cross-sectional view of a main part showing a state where the base film is peeled off, FIG. 3 is a plan view of a packaging container, FIG. 4 is a cross-sectional view of a laminated film serving as a lid material, and FIG. 5 is a cross-sectional view of a main part showing another embodiment of the present invention.

Laminated film 3 serving as lid 2 of packaging container 1 of the present invention
Is composed of a base film 4 and a perforated film 5.

As the base film 4, a film having heat resistance is used. Examples of such a film include various films. In particular, when a barrier property is required, aluminum foil, aluminum vapor-deposited film, nylon, polyvinylidene chloride, ethylene-vinyl alcohol copolymer and the like can be used. Preferably, it is used. When a laminated film obtained by laminating films of various performances is used as the base film 4, the outermost layer is made of a film that does not melt at the time of heat sealing and has a strength that does not break due to the force at the time of peeling off the seal portion. Is preferred. For example, it is preferable to use polyethylene terephthalate, stretched polypropylene, stretched nylon or the like as the outermost layer.

The perforated film 5 is formed with holes having appropriate diameters and intervals.
A film on which 5a is formed is used. Examples of such a film include various films. For example, a single film of polyethylene or polypropylene or a laminated film in which an easy-release agent layer is laminated on polyethylene or polypropylene can be used. The perforated film 5 has a thickness of 15 to 100 μm, and the diameter of the through hole 5 a is 0.1 to 3 mm.
It is preferable that the distance and the distance be about 0.5 to 20 mm.
The diameter and the interval of the through holes 5a should be appropriately set according to the purpose of use of the packaging container 1. In addition, a nonwoven fabric can be used as the perforated film 5.

The base film 4 and the perforated film 5 need only be laminated with a peelable adhesive strength. For this purpose, for example, as shown in FIG. A polyolefin resin layer 6 is interposed between the base film 4 and the films 4 and 5 so that the base film 4 and the films 4 and 5 have an appropriate adhesive strength. . More specifically, polyolefins such as low density polyethylene, linear polyethylene, blends of polyethylene and polypropylene, polypropylene, ethylene-vinyl acetate copolymer and the like can be used. The adhesive strength of the polyolefin resin can be easily adjusted by extrusion lamination, pressure bonding after corona discharge, or the like.

It is preferable to provide a generally used polyurethane-based adhesive layer (AC agent layer) 4a at the interface of the base film 4 on the side of the polyolefin-based resin layer 6 in order to strengthen the adhesive strength between them. Thereby, a film in which the base film 4 and the polyolefin-based resin layer 6 are integrated can be obtained.

As the polyolefin-based resin layer 6, when the perforated film 5 is a polypropylene-based resin, it is preferable to use low-density polyethylene, linear polyethylene, or ethylene-vinyl acetate copolymer resin. In the case of a blend with polypropylene,
It is preferable that the content of polypropylene is 50% by weight or less, desirably 30% by weight or less so that the polyethylene component becomes rich. Thereby, the perforated film 5
The heat-sealing strength between the resin and the polyolefin-based resin layer 6 does not increase more than necessary, so that the laminate can be in a peelable laminated state.

When the perforated film 5 is a polyethylene resin, it is preferable to use polypropylene or a blend of polyethylene and polypropylene. When a blend is used, the polyethylene content is preferably 50% by weight or less, preferably 30% by weight or less so that the polypropylene component becomes rich.

The laminated film 3 can be formed by a commonly used method such as an extrusion lamination method in which the polyolefin resin is melt-extruded between the base film 4 and the perforated film 5 and laminated, or a dry lamination method on the base film 4. Thus, the polyolefin resin layer 6 can be manufactured by a method in which the polyolefin resin layer 6 is strongly adhered, the lamination surface of the polyolefin resin layer 6 and / or the perforated film 5 is subjected to a corona discharge treatment, and both are thermocompression-bonded.

The laminated film 3 thus formed is heat-sealed to the flange 1a of the container opening with the perforated film 5 of the laminated film 3 inside the container, and becomes the lid 2 of the container. At this time, a knob 3a is formed by projecting at least a part of a peripheral portion of the lid 2 from the outer periphery of the container opening lid 1a, and a film of the perforated film 5 is formed on a heat-sealed portion of the knob 3a. A thin portion 5 is formed in the perforated film 5 by performing a heat sealing process with a step to reduce the thickness.

The temperature during the heat sealing is equal to or higher than the temperature at which the perforated film 5 is fused to the container, and the base film (the outermost film when the base film is a laminated film) is not melted. Any temperature may be used, and it can be carried out by an appropriate heat sealing means. Further, the thin portion 5b is desirably provided on an outer peripheral portion of a heat sealing portion of the perforated film 5 to the flange portion 1a,
When the thin part 5b is located inside the heat sealing part,
It does not act as a trigger for peeling the base film 4 from the perforated film 5.

The shape of the heat seal bar 7 is such that the container flange portion 1a can be pressed over the entire surface by a certain width,
Any shape may be used as long as it can form a linear thin portion 5b crossing the direction in which peeling proceeds in the perforated film 5 of the heat seal portion corresponding to 3a). That is, the heat seal bar 7
In addition to the shape for forming the thin portion 5b having the shape shown in FIG. 1, the shape for forming the thin portion having an appropriate shape such as the semicircular thin portion 5c shown in FIG. Things can be used.

〔Example〕

 Hereinafter, examples and comparative examples of the present invention will be described.

Example 1 A biaxially stretched polyethylene terephthalate (16μ) / aluminum foil (12μ) / low-density polyethylene (35μ, lamination side) was dry-laminated in this order as a base film. Using a film (013C) (50μ, pore diameter 0.6mm, hole interval 4mm), using low density polyethylene as the polyolefin resin layer, the base film is fed from the primary side of the extrusion laminator, and the perforated film is the secondary side. While simultaneously feeding the low-density polyethylene resin,
The film was extruded between a base film and a perforated film from a T-die die at 0 ° C. and pressed while forming a polyolefin resin layer, followed by winding.

The adhesive strength between the base film and the polyolefin resin layer of the laminated film thus manufactured is 1500 g / 15 mm width, and the adhesive strength between the polyolefin resin layer and the perforated film is 130 g / 15 mm width (both at a pulling speed of 200 mm). / Min, 180
(Peeling).

With the perforated film of this laminated film as the seal side,
190 ° C × 1kg / cm ² × 1.5 on opening flange of polypropylene container
Heat sealing was performed under the condition of seconds. At this time, as shown in FIG. 3, a knob was extended on one side of the container, and a thin-walled portion having the shape shown in FIG. 1 was formed on the heat-sealed portion of the perforated film at the base of the knob.

The adhesive strength of the heat-sealed part between the polyolefin resin layer and the perforated film after sealing is 950 g / 15 mm width.When the knob is peeled by hand, the perforated film is cut at the thin part and the base is cut from this part. The peeling of the interface between the film and the perforated film proceeded.

Example 2 A dry laminated film of a biaxially oriented polypropylene film (20μ) / aluminum foil (9μ) was used as a base film, and a CMPS film (013C) manufactured by Tocelo Chemical Co., Ltd. (013C) (50μ, pore diameter 0.6mm, hole interval 4mm) ), Using a blend of 30% by weight of polypropylene and 70% by weight of low-density polyethylene as the polyolefin resin, while feeding the base film from the primary side of the extrusion laminator and simultaneously feeding the perforated film from the secondary side. The blend was extruded from a T-die die between a base film and a perforated film at a resin temperature of about 300 ° C. to form a polyolefin resin layer, which was then pressed and wound. At this time, a polyester urethane-based adhesive was applied inline on the aluminum foil side of the base film in advance and dried. Also, on the laminated side of the perforated film,
A corona discharge treatment which was previously subjected to an outline treatment to increase the surface wetting index to 40 dyne or more was used.

The adhesive strength between the base film and the polyolefin resin layer of the laminated film thus manufactured is 1600 g / 15 mm width,
Adhesion strength between polyolefin resin layer and perforated film is 10
The width was 0 g / 15 mm (both at a pulling speed of 200 mm / min and 180 ° peeling).

Next, as in Example 1, a thin portion having the shape shown in FIG. 5 was provided and heat-sealed. At this time, the adhesive strength of the heat-sealed portion between the polyolefin resin layer and the perforated film was 1000 g / 15 mm width. Also, when the knob is peeled by hand, the perforated film is cut at the thin part,
From this part, peeling of the interface between the base film and the perforated film proceeded.

Comparative Example 1 A packaging container was manufactured in the same manner as in Example 1 except that the heat seal bar was changed to a normal whole flat seal type. And although it peeled from the knob part, since there was no trigger of peeling of a perforated film and a base film, the whole laminated film peeled from the container opening.

〔The invention's effect〕

As described above, the method for manufacturing a packaging container of the present invention uses a laminated film in which a perforated film is releasably laminated on a base film as a container lid material, so that the perforated film is exposed by peeling the base film. As a result, appropriate air permeability or water permeability can be imparted to the container lid material. Therefore, it can be widely used as a packaging material for the above-mentioned various foods and non-foods.

In particular, in the present invention, since the thin portion which is a trigger for peeling the perforated film and the base film is formed on the perforated film at the same time as heat sealing, the two films can be easily peeled off without separately providing a trigger for peeling. be able to. Further, since the thin portion is formed at the same time as the heat sealing, the manufacturing process of the packaging container can be simplified, and it is possible to cope with various containers simply by changing the seal type.

[Brief description of the drawings]

1 to 4 show a first embodiment of a packaging container according to the present invention. FIG. 1 is a sectional view of the packaging container, and FIG. 2 is a sectional view of a main part showing a state where a base film is peeled off. FIG. 3 is a plan view of a packaging container, FIG. 4 is a cross-sectional view of a laminated film serving as a lid material, and FIG. 5 is a cross-sectional view of a main part showing another embodiment of the present invention. 1 ... packaging container, 2 ... lid material, 3 ... laminated film, 3a
... knob, 4 ... base film, 5 ... perforated film, 5a ... through hole, 5b, 5c ... thin section, 6 ... polyolefin resin layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65D 77/20 B65D 81/34

Claims (2)

(57) [Claims] 1. A container opening with a perforated film of a laminated film in which a base film having heat resistance that does not melt at a heat sealing temperature and a perforated film having perforations are bonded with a peelable adhesive strength inside. In heat-sealing the flange to form a cover, a knob is formed on at least a part of the periphery of the cover, and the base film is peeled off from the perforated film at the heat-sealed portion of the knob. A packaging container characterized by forming a thin portion which triggers the above. 2. A container opening with a perforated film of a laminated film in which a base film having heat resistance that does not melt at the heat sealing temperature and a perforated film having through holes are bonded with a peelable adhesive strength. When the lid is heat-sealed with a heat-seal bar on the flange to form a lid, at least a part of the periphery of the lid is formed with a knob, and the perforated film of the heat-sealed portion of the knob is formed. A method for producing a packaging container, wherein the packaging container is formed to be thin with the heat seal bar.