JPH0995366A - Structure of airtight packaging bag - Google Patents

Abstract

(57) [Summary] (Modified) [Problem] The user does not need to cut the seal or remove the label before cooking, and the packaging material does not burst during cooking. Further, the present invention provides a cookable packaging container that does not deteriorate the design. SOLUTION: A structure of a hermetically sealed packaging bag in which a through hole or a cut 3 is provided in the vicinity of a valley line obtained by folding a film, and the films constituting the valley portion of the film are part-sealed via a part coating agent 6, an ear portion 2 Forming a through hole or a cut near the mountain line of the film forming the film, the structure of the hermetically sealed packaging bag in which the film forming the mountain part is part-sealed via the part coating agent, the valley line of the film forming the ear part A structure of a hermetically sealed packaging bag in which through holes or cuts are provided in the vicinity, and the films forming the valleys are part-sealed via 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 more particularly to a 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 bag that does not have a bad appearance and does not have a bad design.

[0004]

That is, according to the present invention, the tip of a packaging 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 back, and the folding portion and the other end of the packaging film are folded. In the one in which the polymerized portion is formed by superposing and heat sealing, a through hole or a cut is provided in the vicinity of the valley line where the film is folded back, and the films forming the valley portion of the film are partly coated with each other through a part coating agent. It is a structure of a hermetically sealed packaging bag with part sealing. The invention of claim 2 is an upper layer of a film in which an ear portion is formed by folding the packaging film formed of a plurality of layers having a sealing layer on at least the back surface or a single layer of a sealing material on the outside with a mountain line and a valley line as references. In the case where a polymerized portion is formed by overlapping and heat-sealing the folded-back portion of the end portion of the packaging film with the valley line as a reference, a through hole or a cut near the mountain line of the film forming the ear portion. The structure of a hermetically sealed packaging bag in which the films forming the mountain portion are part-sealed with a part coating agent. According to the invention of claim 3, at least the upper layer of the film in which the ears are formed by folding the outer periphery of the packaging film composed of a plurality of layers having a sealing layer on the back surface or a single layer of the sealing material and forming the ears on the basis of the mountain lines and valley lines. In the case where a polymerized portion is formed by overlapping and heat-sealing the folded-back portion of the end portion of the packaging film with respect to the valley line, a through hole or a cut near the valley line of the film forming the ear portion. The structure of a hermetically sealed packaging bag in which the films forming the valleys are part-sealed via a part coating agent. According to the invention of claim 4, at least the upper layer of the film in which the ears are formed by folding the outer side of the packaging film composed of a plurality of layers having a sealing layer on the back surface or a single layer of the sealing material, based on the mountain line and the valley line. In the one in which the overlapping portion is formed by overlapping the end portion of the packaging film and the folded portion folded back with reference to the valley line and heat-sealed, in the vicinity of the valley line of the folded film to form the overlapped portion. A structure of a closed packaging bag in which a film having a through hole or a cut and forming a valley portion on the side of the overlapping portion is part-sealed with a part coating agent. 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 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 according to the present invention, when heat treatment is performed with food contained therein, the internal temperature rises and the pressure in the container also rises. In the bag and the container of the present invention, since the part where the through hole or the cut is formed in the film or its periphery is part-sealed with the part coating agent, the adhesive strength is weaker than the part sealed by heat sealing.
When the internal pressure exceeds the seal strength of the part seal part, 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 a packaging film in which the heat-sealing film is laminated on the back surface as well as a folded-back portion (back-folded portion) that is folded back upward with reference to the valley line 1c. Are superposed and heat-sealed by heat fusion. A through hole or a cut 3 is formed on the lower layer side near the valley line 1c of the film, and in the present embodiment, the films that are located outside the through hole or the cut 3 and form a valley are partly joined together. The inside of the container is hermetically sealed by adhesion through a seal coating agent.

[0007] FIG. 2 shows an example in which the through-hole or the cut 3 is adhered through the part coating agent 6 at the time of part-sealing.

Next, what is shown in FIG. 3 has an end portion of the upper layer portion of the packaging material 1 in which the ears 2 are formed with the parallel mountain line 1a and the valley line 1b as folds, and a seal layer at least on the back surface. A packaging material 1 composed of a plurality of layers or a single sealing material layer is overlapped with a folded-back portion (back-folded portion) folded back on the upper side with respect to the valley line 1c, and the portion is heat-sealed by heat sealing. Through holes or cuts 3 are formed in the upper layer near the mountain lines 1a of the packaging material 1 forming the ears, and the back surfaces of the films forming the mountain parts on the valley line 1b side of the through holes or cuts 3 are opposite to each other. Is adhered via the part coating agent 6,
The inside of the container or bag is sealed.

FIG. 4 shows an example in which, unlike the embodiment shown in FIG. 3, the part seal is adhered over the entire surface in a form including the through hole or the cut 3 in the part seal.

Unlike the through hole or the cut 3 in the embodiment shown in FIG. 3, the one shown in FIG. 5 is provided in the lower layer near the mountain line 1a of the packaging material 1 forming the ear portion, and the valley from the through hole or the cut 3 is provided. The back side of the film forming the mountain portion on the line side is part-sealed with a part coating agent.

FIG. 6 shows an example in which, unlike the embodiment shown in FIG. 5, the part seal is adhered over the entire surface in a form including the through hole or the cut 3 in the part seal.

In the bag shown in FIG. 3 having the ears and the overlapped portion shown in FIG. 3, a through hole or a cut 3 is provided in the upper layer near the valley line 1b of the packaging material 1 forming the ears, and The films forming the valleys are part-sealed via the part coating agent 6 on the mountain line 1a side of the through hole or the cut 3.

FIG. 8 shows an example in which, unlike the embodiment shown in FIG. 7, the part seal is bonded over the entire surface in a form including the through hole or the cut 3 as well.

In the bag shown in FIG. 9 in which the ears and overlapping portions are formed as shown in FIG. 3, a through hole or a cut 3 is provided in the lower layer near the valley line 1b of the packaging material 1 forming the ears, and The films forming the valleys are part-sealed via the part coating agent 6 on the mountain line 1a side of the through hole or the cut 3.

FIG. 10 shows an example in which, unlike the embodiment shown in FIG. 9, the part seal is adhered over the entire surface in a form including the through hole or the cut 3 in the part seal.

In the bag shown in FIG. 11 in which the ear portion and the overlapped portion are formed as shown in FIG. 3, the through hole or the cut 3 is provided in the lower layer of the film forming the valley portion which is folded back based on the valley line 1c. The films forming the valleys are part-sealed with the part coating agent 6 on the mountain line 1a side of the through hole or the cut 3.

FIG. 12 shows an example in which, unlike the embodiment shown in FIG. 11, the part seal is adhered over the entire surface including the through hole or the cut 3 in the part seal.

In the case of part-sealing, a part-coating agent which can be bonded at a temperature lower than that of heat-sealing and which 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 to 8.0 g / It is configured to apply evenly with a thickness of cm ² and then to seal. FIG. 13 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 material 1,
1 shows a heat-sealed portion where 1 is sealed by heat-sealing. Further, FIG. 14 shows a container 7 having a flange 8 on the periphery of the opening, two parallel mountain lines 1a and two parallel valley lines 1b on the inside of the flange 8 portion of the container 7 as folds, and ears. 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. This packaging material is part-sealed via the part coating agent 6.

The packaging bag according to the present embodiment having the above-mentioned 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 is placed in a microwave oven with food in it, the internal pressure gradually rises because the moisture contained in the food is heated and the evaporation pressure also rises due to the evaporation of the internal moisture, The pressure in the container reaches a predetermined level or higher.
Then, when the ear portion swells and the internal pressure exceeds the adhesive strength of the portion that part-seals the valley portion of the ear portion 2 or the portion that part-seals the mountain portion, the part-sealed portion peels off and the through hole Alternatively, since the inside and the outside are communicated with each other through the cut 3, the pressure becomes close to the atmospheric pressure, and the gas vaporized from the water content of the food is ejected from the through hole or the cut 3.

[0020]

As described above, in the packaging bag according to the present invention, when the internal pressure rises along with the heating of the food, the part seal portion is automatically peeled off due to the difference in the adhesive pressure, and through the through hole or the cut wound. Since it is configured to communicate with the outside, the consumer can cook with peace of mind without doing anything. In addition, since the through hole or the cut is sealed (sealed) by the part coating agent at room temperature or 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 can be obtained. Can be provided. Furthermore, since the packaging bag according to the present invention is of the one-sided folding type, it can be easily inlined into a multi-row filling system. Since the present invention is configured to form the ears or the band-shaped portion by utilizing the folded-back portion (back-folded portion), the structure of folding the packaging material can be simple and at the same time when the back-folded portion is sealed, Sealing can be done.

[Brief description of drawings]

FIG. 1 is an end view of a part of a packaging bag of a first embodiment, which is partially cut.

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

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

FIG. 4 is an end view of a part of the packaging bag of the fourth embodiment, which is partially cut.

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

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

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

FIG. 8 is an end view of a part of the packaging bag of the eighth embodiment, which is partially cut.

FIG. 9 is an end view of a part of the packaging bag of the ninth embodiment, which is partially cut.

FIG. 10 is an end view of a part of the packaging bag of the tenth embodiment, which is partially cut.

FIG. 11 is an end view of a part of the packaging bag of the eleventh embodiment that is partially cut.

FIG. 12 is an end view of a part of the packaging bag of the twelfth embodiment, which is partially cut.

FIG. 13 is a vertical cross-sectional view showing a state in which the internal pressure in the container has risen and the part seal portion has been peeled off.

FIG. 14 is a perspective view showing a state in which 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 1c Valley Line 2 Ears 3 Through Holes or Cuts 4 Food 5 Heat Seal Part 6 Part Coating Agent 7 Container 8 Flange

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Atsumi 6-224 Kaiyamacho, Sakai City, Osaka Prefecture Showa Aluminum Co., Ltd.

Claims (4)

[Claims] 1. Polymerization by folding back the tip of a packaging 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, and heat-sealing the folded back portion and the other end of the packaging film together. In the one in which the film is formed, a through hole or a cut is provided in the vicinity of the valley line where the film is folded back, and the films constituting the valley part of the film are part-sealed with a part-coating agent. The structure of the packaging bag. 2. An upper layer of a film in which an ear portion is formed by folding the outer periphery of 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, with a mountain line and a valley line as a reference, and other packaging. In the one in which the overlapping portion is formed by stacking the folded portion obtained by folding the end portion of the film with respect to the valley line as a reference and heat-sealing, a through hole or a cut is provided in the vicinity of the mountain line of the film forming the ear portion. The structure of a hermetically sealed packaging bag, wherein the films forming the ridges are part-sealed via a part-coating agent. 3. An upper layer of a film in which an ear portion is formed by folding the 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 a mountain line and a valley line as a reference, and other packaging. In the one where the overlapping portion is formed by stacking and heat-sealing the folded-back portion obtained by folding the end portion of the film on the basis of the valley line, a through hole or a cut is provided in the vicinity of the valley line of the film forming the ear portion. The structure of a hermetically sealed packaging bag, wherein the films forming the valleys are part-sealed with a part-coating agent interposed therebetween. 4. An upper layer of a film in which an ear portion is formed by folding a packaging film formed 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 a mountain line and a valley line as a reference and other packaging. In the one in which the overlapped portion is formed by overlapping and heat-sealing the folded-back portion in which the end portion of the film is folded back on the basis of the valley line, a through hole is provided in the vicinity of the valley line of the folded-back film to form the overlapped portion. Alternatively, the structure of a hermetically sealed bag is characterized in that cuts are provided, and the films forming the valleys on the side of the polymerized portion are part-sealed with a part-coating agent interposed therebetween.