JP2899901B2 - Packaging container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a packaging container, and more particularly to a packaging container suitable for packaging a beverage or viscous food to be eaten by heating.

[Prior art] When heating liquids, viscous foods, etc. packaged in a synthetic resin film or a film using a metal foil in a microwave oven, in order to prevent an increase in internal pressure in the package due to steam generated during cooking. Conventionally, various methods have been used.
For example, a method in which a part of the lid material is cut or peeled, a method in which a hole is formed in the lid material with a toothpick or the like, a method in which the lid material is entirely peeled, and the like are used.

[Problems to be solved by the invention]

However, in any of the above-described methods, an operation of providing an opening before heating is required, which is troublesome, and the contents may be scattered or adhere to fingers. In addition, if the above-described cutting or drilling operation is forgotten, there is a risk that the packaging container may burst due to an increase in internal pressure during heating.

Further, some beverages require a good temperature for texture, but conventional containers of this type do not have a function of indicating an optimal heating state. For example, when heating with a microwave oven or the like, if the setting of the heating time is incorrect, heating may be excessive, and the texture may be impaired.

Further, in packaging of liquid or viscous food, etc., the lid material is a drop lid shape, in order to reduce the head space in the container, that is, a lid material that fits concavely into the container opening is used, During eating and drinking, a step was formed at the edge of the container, so that a drinking mouth could not be made, and all the lids had to be peeled off.

Accordingly, an object of the present invention is to provide a packaging container provided with a lid member that can be heated in a microwave oven or the like in a packaged state and can also exhibit an optimal heating state.

[Means for solving the problem]

In order to achieve the above-mentioned object, a packaging container according to the present invention has a first configuration in which a heat-shrinkable film is releasably laminated on one surface of a base material having an opening in the shape of a drinking spout so as to be capable of being covered. The cover material is formed in a concave shape so as to fit into the container from the container opening with the base material inside, and as a second configuration, one side of the air-permeable base material A heat-shrinkable film is releasably laminated to form a lid material, and the lid material is formed in a concave shape so as to fit into the container from the container opening with the base material inside.

That is, the packaging container of the first configuration uses a base material having an opening in the shape of a drinking mouth, the packaging container of the second configuration uses a base material having air permeability, and a heat-shrinkable film is formed on one side of each. Are formed so as to be peelable to form a lid material.

Various materials can be used as the base material having the above-mentioned drinking spout. In particular, a single film such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, and a laminated film using these single films as a heat seal layer can be used. Can be used. The shape of the spout may be any shape as long as the contents easily come out when the container is tilted, and can be formed by well-known means. In addition, the position may be in the molding portion (fitting portion to the container).

Various materials such as a perforated synthetic resin film or a nonwoven fabric can be used as the substrate having air permeability. As the material of the perforated synthetic resin film, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin and the like can be used. In particular, various films such as polyethylene terephthalate can be used by providing a heat seal layer. When used as a container lid,
It is desirable to provide an easy peel layer on the film. In addition, these films need to be provided with through holes in order to impart air permeability. This hole has a diameter of 0.1 to 2
mm, and the distance between the through holes may be about 0.5 to 30 mm, and can be easily provided by piercing a heating needle or the like.

As the non-woven fabric, for example, those formed of polyethylene-based or polypropylene-based fibers can be used. In particular, the basis weight is 10 to 100 g / m ² , and the fiber thickness is 0.1.
It is preferable to use one having a denier of 3 to 3. Also, by laminating an easy-peel material film or coating the easy-peel material, an easy-peel property can be imparted. In addition, in the case where the texture is crushed and the air permeability is impaired by imparting the easy-peel property, it is necessary to form a hole in the easy-peel material in the same manner as the synthetic resin film.

On the other hand, as the heat-shrinkable film, polyvinyl chloride, polypropylene, styrene-butadiene copolymer having a shrinkage ratio of 10% or more in hot water immersion at 90 to 100 ° C. for 10 seconds,
By using a co-extruded multilayer stretched film in addition to a simple film such as a polyamide resin or polyethylene terephthalate, a barrier property can be imparted to the film.
These films may be used singly or in a laminate, and those having an appropriate shrinkage ratio may be used depending on the purpose of use of the packaging container and the area at the time of use, but a film having high shrinkage at a relatively low temperature is preferable. The thickness is not particularly limited, preferably 5 to 100 μm, more preferably 20 to 1
The range of 00 μm is appropriate in terms of cost and strength.

For laminating the heat-shrinkable film and the substrate, a general laminating method (dry lamination, extrusion lamination, etc.) can be used, but a perforated film having holes as described above is used as a gas-permeable substrate. In this case, it is preferable to adopt a method in which at least one of the two films is subjected to a corona discharge treatment and thermocompression bonded so as not to impair the air permeability of the perforated film. In addition, the lamination strength of both can be appropriately set according to the shrinkability of the heat-shrinkable film and the desired shrinkage peeling temperature. For example, when laminating by corona discharge treatment and thermocompression bonding, the discharge conditions and By appropriately setting the thermocompression bonding temperature, an appropriate lamination strength can be obtained.

Next, the laminate of the heat-shrinkable film and the substrate is formed into a concave shape so as to fit into the container from the container opening so that the substrate is located inside the container corresponding to the shape of the opening of the container. . As this method, an ordinary resin molding method, for example, pressure molding by direct heating of a hot platen or the like can be used.
The molding temperature at this time is, for example, 60 to 180 ° C., preferably 80 to 120 ° C., which is suitable because when heated, the distortion during molding is recovered and flattening is easy.

As described above, the lid member made of the laminated body formed in the concave shape has a base formed on the inside of the container, and the concave molded portion is fitted into the container from the container opening, and a well-known close contact such as heat sealing is applied to the container rim. It is adhered by means.

Here, the packaging container of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a packaging container showing one embodiment of the present invention,
FIG. 2 is a cross-sectional view of the packaging container during heating, FIG. 3 is a cross-sectional view of the packaging container at the end of heating, and FIG. 4 is a cross-sectional view of a packaging container according to another embodiment of the present invention.

As shown in FIG. 1, the packaging container 1 of the present invention
A heat-shrinkable film 3 is releasably laminated on one side of the base material 2 having an opening 2a to form a cover material 4, and the cover material 4 is formed.
With the substrate 2 inside and a container 5 containing food and drink.
Are formed in such a manner that they are fitted into and in close contact with the inside of the container 5 from the opening of the container 5. When the container 1 thus formed is heated with a microwave oven or the like, the pressure inside the container increases due to the generation of steam accompanying the temperature rise of food and drink, and the distortion at the time of molding the lid member 4 is recovered by heat. As shown in FIG.
Is pressed from the inside of the container to be in a substantially planar state, and then the heat-shrinkable film 3 shrinks as shown in FIG.
, And the steam spouts from the drinking spout 2a of the base material 2.

Therefore, it is not necessary to cut a part of the container or make a hole before heating, and it is possible to easily perform the heating cooking, and it is also possible to prevent the contents from scattering or sticking to the fingers. Further, by setting the properties of the heat-shrinkable film 3 so that the heat-shrinkable film 3 is contracted and peeled when the content is heated to an appropriate temperature, it is possible to visually confirm the end of the heating, and the can do. In particular, since the spout 2a is formed in the base material 2, the peel strength of the heat-shrinkable film 3 from the base material 2 is controlled so that the peel direction of the heat-shrinkable film 3 is controlled to be opposite to the spout side as shown in the drawing. Or, if the peeling start position is set, the spout 2a remains as it is after heating.
You can eat and drink using. In addition, as shown in FIG. 1, the drinking spout 2a is formed in the concave molding
Even when the cover member 4 is positioned at the fitting portion, the cover member 4 returns to the position before molding when the cover member 4 returns to a planar shape by heating as shown in FIG. The control of the peeling direction of the heat-shrinkable film 3 is as follows.
This can be achieved by providing a non-adhesive portion that triggers peeling on the side of the drinking spout 2a or by forming a slight cut groove.

The packaging container 11 shown in FIG. 4 uses a perforated synthetic resin film 12 having a large number of through-holes 12a as a base material, and a heat-shrinkable film 13 laminated on one side thereof in a releasable manner.
14, the lid member 14 is formed so as to fit in a concave shape into the container 15 from the opening of the container 15 accommodating food and drink, with the base material 12 inside. In the packaging container 11 thus formed, similarly to the case where the base material having the drinking spout is used, the lid material 14 becomes substantially flat by heating, and then the heat-shrinkable film 13 shrinks and peels to form a through hole. Steam gushes from 12a.

Even when a nonwoven fabric is used as the base material, the lid material returns to a planar shape by heating and the heat-shrinkable film shrinks and peels off, so that the same operation and effect as described above can be obtained.

〔Example〕

 Hereinafter, embodiments of the present invention will be described.

Example 1 A laterally uniaxially stretched polyvinyl chloride film (40
μ, Hishilex 502F made by Mitsubishi Plastics) / adhesive / 4-layer coextrusion stretched composite film (ethylene vinyl acetate copolymer / nylon resin / saponified ethylene vinyl acetate copolymer / ethylene vinyl acetate copolymer, 40μ, Mitsubishi Resin OM film R
A laminate having a configuration of (F type) / unstretched polypropylene (50 μ) was used. In addition, the opening part used as a drinking mouth is previously formed in the polypropylene film used as a base material.
The lid material is heated at 90 ° C, heating time and molding time are 3
Using a pressurized air of ² kg / cm ² , a concave shape was formed with a forming die having a diameter of 80 mm and a depth of 5 mm.

On the other hand, as the container, an opening diameter of 90 m made of polypropylene
m, using a round container having a depth of 85 mm, filling the container with 200 cc of water, and forming a concave shaped part on the opening edge of the container so that the base material is on the inside of the container with the lid material being the container opening. And the outer edge was heat-sealed under the conditions of 190 ° C. × 1 kg / cm ² × 1.5 seconds and a seal width of 5 mm.

This was placed in a microwave oven (Matsushita Electric Industrial Model NE-M330, rated high-frequency output 500W) and heated at 500W for 3 minutes. The molding returned in about 60 to 80 seconds, and the lid material was smooth. It was in a state. Thereafter, the heat-shrinkable film started to shrink in about 100 to 120 seconds, peeled off from the lamination interface with the base material, exposing the base material, and steam in the container spouted from the drinking spout.
When the heat-shrinkable film was peeled off, the base material was flat, and the shape of the spout was returned to the state before the lid material was formed, and it was possible to eat and drink as it was.

Example 2 A laterally uniaxially stretched polypropylene film (40
μ, Hishilex SPR film made by Mitsubishi Plastics) / Printing / adhesive / 4-layer co-extrusion stretched composite film (same as in Example 1) /
A laminate composed of a co-extruded composite film (polypropylene / easy peel material for polypropylene, 50μ) was used.
In addition, the opening part used as a drinking mouth is previously formed in the co-extruded composite film used as a base material.

Thereafter, a container was prepared in the same manner as in Example 1, and the container was heated in a microwave oven in the same manner as in Example 1. As a result, the formed portion returned to flatness in about 80 seconds. After about 120 seconds, the shrinkable film shrunk and peeled, exposing the base material, and vapor in the container spouted from the drinking spout. The temperature of the packing at this time was 60 ° C.

Example 3 As a lid material, a laterally uniaxially stretched polyvinyl chloride film (same as in Example 1) / printing / adhesive / four-layer coextruded stretched composite film (same as Example 1) / perforated coextruded composite film (executed) (The same configuration as in Example 2) was used. In addition, in the perforated co-extruded composite film serving as a breathable base material, a through hole is formed in advance by piercing a heating needle in place of an opening serving as a drinking mouth.

Thereafter, a container was prepared in the same manner as in Example 1, and the container was heated in a microwave oven in the same manner as in Example 1. As a result, the molded portion returned to flatness in about 60 to 80 seconds. After about 100 to 120 seconds, the shrinkable film shrank and peeled to expose the air-permeable base material, and the vapor in the container was blown out from the through hole.

Example 4 The same laminate as that used in Example 2 was used as a cover material. However, in the co-extruded composite film serving as a base material, a through hole formed by a heating needle is formed in advance in place of the opening serving as a drinking spout.

Thereafter, a container was prepared in the same manner as in Example 1, and the container was heated in a microwave oven in the same manner as in Example 1. As a result, the formed portion returned to flatness in about 80 seconds. After about 120 seconds, the shrink film was shrunk and peeled off, and the vapor in the container was blown out from the through hole of the air-permeable base material. The temperature of the packing at this time was 62 ° C.

Example 5 As a lid material, a laterally uniaxially stretched polyvinyl chloride film (same as in Example 1) / adhesive / 4-layer coextrusion stretched composite film (same configuration as in Example 1, 40μ, OM film RH made by Mitsubishi Plastics)
Type) / Polypropylene nonwoven fabric (weight 25g / cm ²⁾
A laminate having a configuration of 0.5 denier fiber) was used. The lid material was heated at a hot platen temperature of 120 ° C, a heating time and a molding time of 3 seconds,
Using a compressed air of 2.5 kg / cm ² , a concave shape was formed with a forming die having a diameter of 80 m / m and a depth of 5 mm.

Next, the container was heat-sealed to the opening edge of the same container as in Example 1 filled with 200 cc of water under the conditions of 190 ° C. × 1 kg / cm ² × 3 seconds and a seal width of 5 mm.

After heating in a microwave oven in the same manner as in Example 1,
The molded part returned to flatness in about 80 seconds. After about 120 seconds, the shrink film was shrunk and peeled off, and the vapor in the container was jetted from the nonwoven fabric as the base material.

[Effects of the Invention] As described above, the packaging container of the present invention uses a substrate having an opening in the shape of a drinking spout, or a substrate having air permeability, and peels off the heat-shrinkable film on one surface thereof. The lid is formed as possible to form a lid, and the lid is formed in a concave shape so as to fit into the container from the container opening with the base material inside, so that the head in the package of the liquid or viscous food is used. The concave shape is kept inside the container to reduce the space, and the shrinkable film is shrunk and peeled off from the base material when heated by a microwave oven or the like, so that the packaging container can be prevented from bursting.
Further, if the heating is completed in a state where the molding of the molded part returns or in a state where the heat-shrinkable film is peeled off, for example, a temperature suitable for hot sake of sake can be obtained.

In particular, in the case of a base material having an opening in the shape of a spout, since the forming of the molded portion is returned by heating and the lid material becomes flat, a spout having no steps can be obtained.

[Brief description of the drawings]

1 is a cross-sectional view of a packaging container showing one embodiment of the present invention, FIG. 2 is a cross-sectional view of the same packaging container during heating, FIG. FIG. 7 is a sectional view of a packaging container showing another embodiment of the present invention. 1,11: Packaging container, 2,12: Base material, 2a: Spout, 12a
…… through holes, 3,13 …… heat-shrinkable film, 4,14 …… lid material,
5,15 …… container

Claims (2)

(57) [Claims] A heat-shrinkable film is releasably laminated on one side of a base material having an opening in the shape of a drinking mouth to form a lid, and the lid is formed with the base material inside and a container. A packaging container formed in a concave shape so as to fit into the container from an opening. 2. A lid is formed by laminating a heat-shrinkable film on one side of an air-permeable base material so as to be peelable, and the lid is inserted into the container from the container opening with the base material inside. A packaging container having a concave shape to be fitted therein.