JPH0995365A - Airtight packaging bag and airtight packaging container - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] To provide a cookable packaging container that does not require the user to cut the seal or remove the label before cooking, and the packaging material does not burst during cooking. provide. SOLUTION: A hermetically sealed packaging bag in which an ear portion 2 is formed by folding a packaging film composed of a plurality of layers having a sealing layer on at least a back surface or a single layer of a sealing material and parallel to the outside with a mountain line 1a and a valley line 1b as a reference. In the above, a through hole or a cut 3 is provided in the vicinity of the valley line, and the films forming the valley portion of the ear part are part-sealed via the part coating agent 6, or the through hole or the vicinity of the mountain line is formed. Cuts are provided, and the back surfaces of the films forming the ridges of the ears are part-sealed with a part-coating agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to packaging of foods that can be cooked in a microwave oven, and is a packaging container or packaging bag that can be heat-treated while containing foods.

[0002]

2. Description of the Related Art In the conventional packaging form of frozen foods, chilled foods or room temperature foods, the internal pressure rises due to the gas (water vapor etc.) generated inside the container when heated by a microwave oven, and in the worst case the packaging container Had the inconvenience of bursting. Therefore, make a hole in the packaging material,
A packaging container has been invented, which can be sealed by pasting a label from above the hole, and by peeling off the label immediately before cooking (utility model registration No. 3002228). . Perforations are provided in at least one layer of the multilayer film, and the bag is torn from the perforations during cooking (Actual Kaihei 02-10
No. 8861) or a packaging container provided with a safety valve and configured to inject internal gas from the valve when the pressure in the container reaches a predetermined level or higher (Actual No. 03-72817) is invented and known. There is.

[0003]

However, in the method of making a hole in the packaging material in advance, it is necessary for the consumer to peel off the label before use and the strength of the portion to which the label is attached is weak. There is an inconvenience that the contents protrude from the part. When a perforation is provided in one layer of the multilayer film, air and various bacteria may enter from the perforation and the contents may be deteriorated, and the strength of the bag when the bag ruptures from the perforation or the film becomes unstable. There are problems such as cost increase due to stacking in multiple layers. Furthermore, in the case of the method of installing a safety valve, it is natural that the cost will be higher than the conventional packaging, and the appearance of the design will be poor because it will protrude from the container by providing the safety valve. There is. Therefore, the present invention has been made in view of the inconveniences of the conventional techniques, and does not require the user to cut the seal or remove the label before cooking, and the packaging material may burst during cooking. It is an object of the present invention to provide a cookable packaging container that does not have a bad appearance and does not have a bad design.

[0004]

Means for Solving the Problems That is, according to the present invention, a wrapping film composed of a plurality of layers having at least a sealing layer on the back surface or a single layer of a sealing material is folded on the outside with parallel peak lines and valley lines as a reference. In a hermetically-sealed packaging bag having a part formed, a through-hole or a cut is provided in the vicinity of the valley line, and the hermetically-sealed packaging bag in which the films forming the valleys of the ears are part-sealed via a part-coating agent has the object To achieve. The invention according to claim 2 is a hermetically sealed packaging bag in which an ear portion is formed by folding a packaging film composed of a plurality of layers having a sealing layer on at least a back surface or a single layer of a sealing material on the outside with parallel mountain lines and valley lines as a reference. In the above, the hermetically sealed packaging bag is provided with a through hole or a cut near the mountain line, and the back surfaces of the films forming the mountain parts of the ears are part-sealed via a part coating agent. According to a third aspect of the present invention, in a closed container including a container having a flange on an opening peripheral edge and a packaging material heat-sealed to a flange portion of the container, the packaging material has a plurality of layers or seals having a seal layer on at least a back surface. Formed by folding parallel to the outside of the packaging film made of a single layer of the mountain line and the valley line to form the ear portion, providing a through hole or a cut in the vicinity of the valley line, the valley portion of the ear portion. It is an airtight packaging container in which the constituent films are part-sealed over the entire surface via a part coating agent. The invention of claim 4 is a container having a flange at the opening periphery,
A closed container made of a packaging material heat-sealed to a flange portion of the container, wherein the packaging material is composed of a plurality of layers having a sealing layer on at least the back surface or a packaging film composed of a single layer of the sealing material. A sealed packaging container in which the ears are formed by folding with reference to, a through hole or a cut is provided in the vicinity of the mountain line, and the back surfaces of the films forming the mountain parts of the ears are part-sealed via a part coating agent. Is. The packaging film has a seal layer composed of a resin coatable film, a heat seal film laminate or a film that can be adhered by hot melt, and the surface is composed of a heat resistant film, and further, a non-barrier film or a barrier film as an intermediate layer. It is also possible to configure with a single layer or multiple layers. When a single-layer heat-sealable film such as polypropylene is used as the seal layer, the surface layer and the intermediate layer may not be provided and the seal layer may be a single layer. The part coating agent is made of a material having a sealing strength lower than that of the heat seal film, and for example, a polypropylene type or ethylene-vinyl acetate type coating agent is used.

[0005]

In the packaging bag and the packaging container according to the present invention, when heat treatment is performed with food contained therein, the internal temperature rises and the pressure inside the container also rises. In the bag and container of the present invention, since the through hole or the cut portion or its periphery is part-sealed with a part coating agent, the adhesive strength is weaker than the part sealed by heat sealing, and therefore the internal pressure Exceeds the seal strength of the part seal part, and the part seal peels off. As a result, the gas inside is released from the through holes or cuts, so that the packaging material does not burst.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the illustrated embodiments. In the figure, 1 is a packaging material in which a heat-sealing film is laminated on at least the back surface, and the packaging material 1 is formed with parallel ridge lines 1a and valley lines 1b as folds to form ears 2. 1 and FIG.
In this embodiment, through holes or cuts 3 for degassing are provided at predetermined intervals in the longitudinal direction at the rising portion from the valley line 1b to the mountain line 1a. In the embodiment of FIG. 1, the through holes or cuts 3 are formed. The packaging material 1 on the mountain line side extending further outward is part-sealed via a part coating agent 6.

In the embodiment shown in FIG. 2, the packaging material forming the troughs of the ears including the through holes or cuts 3 is part-sealed over the entire surface with a part coating agent.

In the embodiment shown in FIG. 3, the through hole or cut 3 provided in the packaging material 1 is provided in the lower layer of the packaging material 1 forming the trough, and the packaging forming the trough outside the through hole or cut 3 is formed. The material is part-sealed via the part-coating agent 6.

In the embodiment shown in FIG. 4, the through hole or cut 3 is formed.
In this case, the packaging material forming the valley portion including is entirely sealed with a part coating agent.

In the embodiment of FIG. 5, the through hole or cut 3 provided in the packaging material 1 is provided on the mountain line side of the upper layer of the packaging material 1 constituting the mountain portion, and the mountain portion inside the through hole or cut 3 is provided. Part coating agent 6 on the backside of packaging material 1
Part-sealed through.

In the embodiment shown in FIG. 6, the through hole or cut 3 is provided.
In this case, the back surfaces of the packaging material 1 forming the mountain portion including are covered over the entire surface with a part coating agent and are part-sealed.

In the embodiment of FIG. 7, the through hole or cut 3 provided in the packaging material 1 is provided on the mountain line side of the lower layer of the packaging material 1 forming the mountain portion, and the mountain portion inside the through hole or cut 3 is provided. Part coating agent 6 on the backside of packaging material 1
Part-sealed through.

In the embodiment shown in FIG. 8, the through hole or cut 3 is formed.
In this case, the back surfaces of the packaging material 1 forming the mountain portion including are covered over the entire surface with a part coating agent and are part-sealed.

In the case of part-sealing, a part-coating agent that can be bonded at a temperature lower than that of heat-sealing and has a lower strength than the adhesive strength of the heat-sealing of the packaging material is selected, and the coating agent is 0.5-8.0 g / It is configured to apply evenly with a thickness of cm ² and then to seal. FIG. 9 is a cross-sectional view of a state in which the food 4 is wrapped in a packaging bag having the ears 2, and the reference numeral 5 indicates the packaging materials 1 and 1.
Shows a heat-sealed portion which is sealed by heat-sealing. Further, FIG. 10 shows a container 7 having a flange 8 on the periphery of the opening, two parallel mountain lines 1a on the flange 8 portion of the container 7 and two parallel valley lines 1b on the inner side of the container 7 as folds. 2 are formed, and through holes or cuts 3 for degassing are provided at a predetermined interval at the rising portion from the valley line 1b to the mountain line 1a, and the valley part extending to the outside of the through hole or cut 3 is formed. The packaging material is part-sealed via a part-coating agent.

The packaging bag or the packaging container according to the present embodiment having the above-described structure is heat-sealed by strong heat sealing except for the through hole or the valley portion where the cut 3 is formed. As a result, when the packaging bag or packaging container is placed in a microwave oven with food in it, the moisture contained in the food is heated and the internal pressure gradually rises, and the evaporation pressure is also increased because the internal moisture is vaporized. The pressure rises and the pressure in the container reaches a predetermined level or higher. Then, the ears bulge and the part-sealed portion peels off in a state of exceeding the adhesive strength of the portion where the valley portion of the ear portion 2 is part-sealed or the portion where the mountain portion is part-sealed, and the through-hole or the cut 3 Since the inside is in communication with the outside through the pressure, the pressure becomes close to the atmospheric pressure, and the gas vaporized from the moisture of the food is ejected from the through hole or the cut 3.

[0016]

As described above, in the packaging bag or packaging container according to the present invention, when the internal pressure rises as the food is heated, the part seal portion is automatically peeled off due to the difference in the adhesive force, and the through-hole or cut damage is caused. Since it is configured to communicate with the outside via the, the consumer can safely cook without doing anything. In addition, since the through hole or the cut is sealed (sealed) by the part coating agent at room temperature and at low temperature, the sealed state can be maintained until the part seal part is peeled off as a result of cooking, so that a clean food product can be obtained. Can be provided. Furthermore, since the packaging bag or the packaging container according to the present invention is a one-sided folding type, it can be easily inlined into a multi-row filling system.

[Brief description of drawings]

FIG. 1 is an end view of a part of a container or a bag according to a first embodiment, which is partially cut.

FIG. 2 is an end view of a part of the container or bag of the second embodiment, which is partially cut.

FIG. 3 is an end view of a part of the container or bag of the third embodiment, which is partially cut.

FIG. 4 is an end view of a part of a container or bag according to a fourth embodiment, which is partially cut.

FIG. 5 is an end view of a part of the container or bag of the fifth embodiment, which is partially cut.

FIG. 6 is an end view of a part of the container or bag of the sixth embodiment, which is partially cut.

FIG. 7 is an end view of a part of the container or bag of the seventh embodiment, which is partially cut.

FIG. 8 is an end view of a part of the container or bag of the eighth embodiment, which is cut away.

FIG. 9 is a vertical cross-sectional view showing a state in which the internal pressure in the container rises and the part seal part is peeled off.

FIG. 10 is a perspective view showing a state where the packaging material according to the present invention is used as a lid of a container.

[Explanation of symbols]

 1 Packaging Material 1a Mountain Line 1b Valley Line 2 Ears 3 Through Holes or Cuts 4 Food 5 Heat Seal 6 Part Coating Agent 7 Container 8 Flange

Front page continuation (72) Inventor Takashi Atsumi 6-224 Kaiyamacho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd.

Claims (4)

[Claims] 1. A hermetically sealed packaging bag in which an ear portion is formed by folding a packaging film composed of a plurality of layers having a sealing layer on at least a back surface or a single layer of a sealing material, and folding the parallel ridge lines and valley lines parallel to each other on the outside. A hermetically sealed packaging bag, characterized in that a through hole or a cut is provided in the vicinity of the valley line, and the films forming the valley portions of the ears are part-sealed via a part coating agent. 2. A hermetically sealed packaging bag in which an ear portion is formed by folding a packaging film composed of a plurality of layers having a sealing layer on at least a back surface or a single layer of a sealing material on the outside with parallel mountain lines and valley lines as a reference, A hermetically sealed packaging bag, characterized in that a through hole or a cut is provided in the vicinity of the mountain line, and the back surfaces of the films forming the mountain parts of the ears are part-sealed with a part coating agent. 3. A closed container comprising a container having a flange on the periphery of the opening and a packaging material heat-sealed to the flange portion of the container, wherein the packaging material has a plurality of layers or a single sealing material having a sealing layer on at least the back surface. Form the ears by folding the mountain line valley line as a reference on the outside of the packaging film composed of layers, provide through holes or cuts in the vicinity of the valley line, and the films forming the valley parts of the ears are An airtight packaging container characterized by being part-sealed via a part-coating agent. 4. A closed container comprising a container having a flange around the opening and a packaging material heat-sealed to the flange portion of the container, wherein the packaging material has a plurality of layers or a single sealing material having a sealing layer on at least the back surface. The ridges are formed on the outside of the wrapping film composed of the layers with the mountain line valley line as a reference to form an ear part, and a through hole or a cut is provided in the vicinity of the mountain line, and the back surfaces of the films forming the mountain parts are partly joined together. An airtight packaging container characterized by being part-sealed via a coating agent.