KR100986599B1 - Packaging container for microwave oven - Google Patents

Abstract

The present invention does not require a special member or complicated process, by processing the packaging material itself constituting the packaging container for microwave ovens, such as packaging bags, cups, trays, the heating and cooking of the contents of the packaging container is completed, the packaging container is automatically An object of the present invention is to provide a packaging container for a microwave oven that can easily recognize the opening.

Moreover, an object of this invention is to provide the packaging container for microwave ovens which can avoid the danger of spilling the contents of a packaging container, or contacting an opening, and causing burns, when heating in a microwave oven. In the present invention, in the packaging container for a microwave oven provided with the vapor extraction seal | sticker which has a weakening part in the packaging container which seals by sealing by heat-sealing a plastic film, the vapor extraction seal | sticker at the time of the peeling opening of the said vapor extraction seal | sticker part in a vapor extraction seal | sticker part A label presenting means is provided so that the packaging material of the front and back constituting the part becomes recognizable as another.

Packaging bags, packaging containers for microwave ovens, packaging materials, plastic films, weakening parts, extraction sealing parts, marker display means

Description

Packaging container for microwave oven {Packaging container for microwave oven}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to packaging containers for microwave ovens, such as packaging bags, cups and trays filled with contents such as retort foodstuffs consisting of liquids, solids, or mixtures thereof. When the packaging container of the present invention is heated in a microwave oven, the steam or the like generated inside the packaging container is automatically discharged to prevent rupture, deformation, or scattering of the packaging container, and the packaging container is opened. It can be easily recognized.

If a packaging bag such as a retort food or frozen food, and a packaging container such as a cup or a tray is heated in a microwave oven, the pressure inside the bag rises due to water vapor generated from the contents accompanying heating and the packaging container ruptures. As the contents are scattered, the inside of the microwave may be contaminated or the human body may be injured such as burns.

For this reason, before heating and cooking such a packaging container in a microwave oven, the packaging container is partially opened in advance, and water vapor or the like generated in the packaging container is discharged to the outside by opening a hole in the packaging container body, A method of preventing rupture is taken.

However, this method is laborious for the average consumer. In addition, when such a method is adopted, since steam generated by microwave heating is immediately discharged out of the packaging container, there is a drawback that the steaming effect of the contents of the steam is reduced, and the flavor of the heated cooked contents is lowered.

In order to eliminate such a fault, the packaging container which provided the automatic opening mechanism which automatically discharges the internal pressure rise of the packaging container at the time of microwave heating is proposed variously (for example, refer patent documents 1-4).

In these packaging containers, the opening of the packaging container by microwave heating can be judged as the sound of steam coming out during and after the opening and the inside of the range being clouded with steam. However, the determination method of such an opening is hard to understand, and the opening of a packaging container may be overlooked.

In order to eliminate such a fault, what connected the separate signal flute to the container for exclusive use of a microwave oven, a food bag, etc. is proposed (refer patent document 5). However, since these containers require expensive separate signal flutes and require a step of connecting these signal flutes, there is a problem in that the manufacturing process of the containers becomes complicated, resulting in an increase in cost.

On the other hand, a packaging in which a hidden printing layer is provided in a heat seal portion of a normal packaging bag not subjected to microwave heating, and letters and symbols appear when the bag is opened, thereby preventing mixing of toxic substances and the like. Encapsulation is also proposed (for example, refer patent document 6). However, in such a packaging bag, it becomes difficult to recognize a character or a symbol which appears when it is opened unless there is an area of a certain degree or more as a portion for providing a shielding printed layer. Therefore, such a technique cannot be diverted to the vapor extraction seal which automatically opens upon heating of packaging containers for microwave ovens such as packaging bags, cups and trays.

Patent Document 1: Japanese Patent Laid-Open No. 10-59433

Patent Document 2: Japanese Patent Laid-Open No. 10-95471

Patent Document 3: Japanese Patent Laid-Open No. 10-101154

Patent Document 4: Japanese Patent Application Laid-Open No. 2002-249176

Patent Document 5: Japanese Patent Application Laid-Open No. 6-245861

Patent Document 6: Seal No. 62-90334

Therefore, this invention processes the packaging material itself which comprises the packaging container for microwave ovens, such as a packaging bag, a cup, and a tray, without requiring a special member or a complicated process, and the heating cooking of the contents of a packaging container is completed, and a packaging container An object of the present invention is to provide a packaging container for a microwave oven, in which the automatic opening can be easily recognized. Moreover, an object of this invention is to provide the packaging container for microwave ovens which can avoid the danger of spilling the contents of a packaging container, or contacting an opening, and causing burns, when heating in a microwave oven.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining, the present invention print-processes the steam extraction sealing part of the packaging material of the front and back which comprises the packaging container for microwave ovens, such as a packaging bag, a cup, and a tray provided with the vapor extraction sealing part which has a weakening part. The present invention has been found to solve the above problems by providing a label display means in which the packaging material at the front and back is recognizable as a different one at the time of the peeling opening of the vapor extraction seal, or the like.

That is, this invention takes the structure of the following 1-15.

1. A packaging container for a microwave oven provided with a vapor extraction seal having a weakening portion in a packaging container that is sealed by heat sealing a plastic film, wherein the vapor extraction seal has a vapor extraction seal at the peeling opening of the vapor extraction seal; A packaging container for a microwave oven, wherein a label display means is provided so that the packaging material on the front and back sides can be recognized as different.

2. The printing layer of the shape which has an outline part is provided in the vapor extraction sealing part of one plastic film which comprises a packaging container, and the outline extraction part is provided in the vapor extraction sealing part of the other plastic film which comprises a packaging container. The packaging container for a microwave oven according to 1, wherein a label display means is provided by providing a printing layer having a shape corresponding to the portion.

3. Color the vapor extraction seal of the one plastic film constituting the packaging container with the first color, and color the vapor extraction seal of the other plastic film constituting the packaging container with the second color different from the first color. The packaging container for a microwave oven of 1 characterized by the above-mentioned.

4. The packaging container for a microwave oven according to the above 1, wherein a label display means is provided in which the peeling surface is opaque or whitened along with peeling due to cohesive failure of the vapor extraction seal of the plastic film constituting the packaging container. .

5. The packaging container for a microwave oven according to item 4, wherein a label display means is formed by providing a colored printing layer on an upper layer of the container outer surface side of the vapor extraction seal portion of the at least one plastic film constituting the packaging container.

6. The packaging container for a microwave oven according to any one of the above 1 to 5, wherein the vapor extraction sealing part is connected to the peripheral edge sealing part of the packaging container and provided.

7. The packaging container for a microwave oven according to any one of the above 1 to 5, wherein the vapor extraction seal is separated from the circumferential edge of the packaging container.

8. The packaging container for a microwave oven according to any one of 1 to 7, wherein the weakening portion is formed by providing a through hole, a semi through hole, or a slit in the vapor extraction seal.

9. The former according to any one of 1 to 5 above, wherein a vapor extraction seal having a weakened portion is formed by providing a notch in the packaging container toward the inside of the container and heat-sealing the peripheral portion of the notch. Microwave packaging.

10. The packaging container for a microwave oven according to any one of 1 to 9, wherein a spout forming means is provided in the vicinity of the vapor extraction seal.

11. The packaging container for a microwave oven according to any one of 1 to 10 above, wherein the packaging container is a packaging bag sealed by heat sealing a plastic film.

12. The packaging container for a microwave oven according to 11, wherein the packaging bag is a standing pouch.

13. The packaging container for a microwave oven according to 11 or 12, wherein the packaging bag is a packaging bag having a branching portion.

14. The packaging container for a microwave oven according to any one of 1 to 5, wherein the packaging container is sealed by heat sealing a lid made of a plastic film to the container body having a flange portion.

15. The packaging container for a microwave oven according to 14, wherein the vapor extraction seal portion is formed by protruding the flange portion of the packaging container and the heat seal portion of the lid toward the inner direction of the container.

1 is a view showing an example in which the present invention is applied to a packaging bag for a microwave oven.

2A to 2C are diagrams for explaining label display means provided on the vapor extraction seal of the packaging bag of FIG.

3A and 3B are views for explaining the markings that appear during the peeling opening of the vapor extraction seal of the packaging bag of FIG.

4 is a view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

5 is a view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

6 is a view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

7 is a view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

8 is a view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

9 is a view showing an example in which the present invention is applied to a tray-type microwave container.

10 is a plan view of the container of FIG. 9.

11A and 11B are schematic diagrams showing a cross section of a vapor extraction seal of the vessel of FIG. 9;

* Description of the symbols for the main parts of the drawings *

1, 21, 31, 41, 51, 61: packing bag for microwave oven

2, 112: circumferential edge seal 3, 43, 53, 113: steam extraction seal

4, 44, 54: weakening portion 5: notch

6: sewing machine eye 7: bottom fold

11: outline part 12, 14: seamless part

13: shape 52: branch

56: opposing part 57: opening preventing means

58: branch base 100: microwave oven packaging container (tray)

101: container body 102: flange portion

103: lid 115: opening

In the present invention, as a plastic film constituting a packaging container for a microwave oven such as a packaging bag, a cup, a tray, or the like, a plastic material having heat sealability used in the manufacture of the packaging container is usually used. As such a plastic material, the single-layer film, sheets, which consist of a thermoplastic resin which has heat sealing property, the multilayer film which laminated | stacked the thermoplastic resin which has heat sealing property, etc. with another thermoplastic resin, etc. are mentioned, for example.

Examples of the plastic material having such heat sealing properties include known low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, polypropylene, propylene-ethylene copolymer, ethylene-vinyl acetate copolymer, and ethylene-unsaturated carboxyl. Olefin resins such as olefin resins graft-modified with an acid or an anhydride thereof, polyamide to copolyamide resins having a relatively low melting point to low softening point, polyester to copolyester resins, and polycarbonate resins are used.

Moreover, as a plastic material which has heat sealing property, and other plastic material laminated | stacked, the thermoplastic resin and various barrier films with or without heat sealing property can be used.

As such a thermoplastic resin, for example, crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly4-methylpentene-1, low-, medium-, or high density polyethylene, ethylene- Polyolefins such as vinyl acetate copolymer (EVA), EVA gum, ethylene-ethyl acrylate copolymer (EEA), and ion crosslinked olefin copolymer (ionomer); Aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymers; Halogenated vinyl polymers such as polyvinyl chloride and vinylidene chloride resin; Polyacrylic resins; Nitrile polymers such as acrylonitrile-styrene copolymer and acrylonitrile-styrene-butadiene copolymer; Polyesters such as polyethylene terephthalate and polytetramethylene terephthalate; Various polycarbonates; Fluorine resin; And thermoplastic resins such as polyacetals such as polyoxymethylene. These thermoplastic resins may be used alone or in combination of two or more thereof. Moreover, you may mix | blend and use various additives with these thermoplastic resins.

In addition, as various barrier films, silica deposition polyester film, alumina deposition polyester film, silica deposition nylon film, alumina deposition nylon film, alumina deposition polypropylene film, carbon film deposition polyester film, carbon film deposition nylon film, alumina and silica Co-extruded film, polypropylene / ethylene-vinyl alcohol co-extruded film, polypropylene Vinyl alcohol coat polypropylene film, polyvinyl alcohol coat polyester film, polyvinyl alcohol coat nylon film, polyacrylic acid resin coat polyester film, polyacrylic acid resin coat nylon film, polyacrylic acid resin coat polypropylene film, polyglycolic acid resin coat poly Ester Film, Polyglycolic Acid Organic resin coat film such as coat nylon film, polyglycolic acid resin polypropylene film, and hybrid coating material made of organic resin material and inorganic material coated on base film such as polyester film, nylon film, polypropylene film, etc. Etc. can be mentioned. These barrier films can be used individually or in combination of 2 or more types.

In the present invention, an unstretched, uniaxial or biaxially stretched film or sheet composed of the plastic material is manufactured or molded by a conventional method to produce a packaging container for a microwave oven such as a packaging bag, a cup, a tray, or the like. do. When manufacturing a packaging bag with the laminated | multilayer film of the thermoplastic resin which has heat sealing property, and the thermoplastic resin which does not have heat sealing property, it arrange | positions so that the thermoplastic resin layers which have heat sealing property may become an inner surface, and heat-sealing. Moreover, an adhesive resin layer can be interposed between each layer which comprises a laminated | multilayer film as needed.

Next, the packaging container for microwave ovens of this invention is demonstrated in detail based on the example which applied this invention to the packaging bag based on drawing, but the following specific example does not limit this invention.

1 to 3 are diagrams showing an example of a packaging bag for a microwave oven provided with a vapor extraction seal having a weakening part of the present invention. FIG. 1 is a front view of a packaging bag, and FIG. 2 is an enlarged schematic diagram for explaining a label display means provided in a vapor extraction seal of the packaging bag. 3 is an enlarged schematic diagram explaining the mark that the vapor extraction sealing part peels and opens when the packaging bag is heated in a microwave oven.

The packaging bag 1 for a microwave oven heat-seales the peripheral edge part 2 of the packaging material (plastic film) which comprises the front and back of a bag, and the steam extraction sealing part which has the weakening part 4 in the corner part of a bag ( It was produced by installing 3). The notch 5 is formed in the upper part of the bag in order to facilitate opening of the bag after completion of cooking by the microwave oven.

In this packaging bag, the weakening part 4 is formed by providing one through hole in the vapor extraction sealing part 3, but this weakening part can also be formed by providing a semi-through hole or a slit instead of the through hole. A plurality of through holes, semi through holes, or slits may be provided in the vapor extraction seal 3.

The vapor extraction seal 3 of any of the packaging materials on the front and back constituting the packaging bag 1 is printed with a shape 12 having an outline part 11 as shown in FIG. 2A. On the other hand, the vapor extraction sealing part 3 of another packaging material is printed with the shape 13 corresponding to the outline part 11 of FIG. 2A as shown in FIG. 2B. It is preferable to form this pattern 13 larger than the outline part 11 in order to make alignment at the time of heat-sealing a packaging bag easy.

When the vapor extraction seal part 3 is formed by overlapping and heat-sealing the outline part 11 of the front and back packaging material which comprises the packaging bag 1, and the shape 13 corresponding to this, this vapor extraction seal part 3 In Fig. 2C, a shape 14 is obtained in which the entire surface is uniformly and seamlessly printed. The vapor extraction sealing portion 3 is provided with a through hole at the same time as the heat sealing or after the heat sealing, so that the weakening portion 4 is formed.

When the packaging bag 1 is filled and sealed with contents such as curry or stew, and then heated in a microwave oven, the internal pressure of the packaging bag 1 increases due to water vapor generated from the contents, and the packaging bag 1 is a center point. It expands from P toward the circumference. As a result, stress concentration occurs in the portion B closest to the center point P of the vapor extraction seal 3, and the break opening of the vapor extraction seal 3 starts.

When the sealing part peels back and retreats by stress concentration in the vapor extraction sealing part 3, and the peeling reaches the weakening part 4, since the packaging bag 1 partially opens and water vapor etc. are discharged to the outside, Rupture of the packaging bag 1 can be prevented.

The vapor extraction sealing part 3 which peeled and opened has the space which has the outline part 11 printed in the vapor extraction sealing part of each packaging material which comprises the packaging bag 1 as shown to FIG. 3A and FIG. 3B. The print shape 12 and the shape 13 corresponding to the outline part 11 are shown. As a result, it can be easily recognized that the packaging bag 1 automatically opens and the heating cooking of the contents is completed. It goes without saying that the shape formed on the vapor extraction seal can be arbitrarily selected. In addition, this shape can be provided not only in a vapor extraction seal | sticker but also in the part adjacent to this.

In the said example, the label display means was comprised by printing a pattern in the steam extraction sealing part of each packaging material which comprises a packaging bag. This label display means can also be configured by coloring the vapor extraction seal of one packaging material constituting the packaging bag with a first color, and coloring the vapor extraction seal of the other packaging material with a second color different from the first color. .

For example, when the outside of the vapor extraction seal of the packaging bag is printed in red and the inside of the packaging is heat sealed, the vapor extraction seal is colored purple. When this packaging bag is heated in a microwave oven and the vapor extraction seal part is peeled and opened, the outer side turns red and the inner side turns blue. Accordingly, it can be easily recognized that the heating cooking of the contents is completed and the bag is automatically opened.

In the above example, the circular extraction seal 3 is provided separately from the circumferential edge seal 2 at the corner of the packaging bag 1, but at the position where the vapor extraction seal 3 is provided, , Shapes, dimensions and the like can be arbitrarily selected. Moreover, the shape, dimension, etc. of the weakening part 4 formed in the vapor extraction sealing part 3 can also be selected suitably. And as a formation method of the weakening part 4, mechanical processing, such as a punching process, laser processing, etc. can be selected arbitrarily.

4 to 6 are diagrams showing another example in which the present invention is applied to a packaging bag for a microwave oven, respectively.

The packaging bag 21 of FIG. 4 shows an example in which the present invention is applied to a standing pouch. In this example, the shape of the vapor extraction sealing part 3 formed in the corner part of the packaging bag 21 was made into substantially triangular shape, and the bottom fold part 7 was provided in the bottom part of the packaging bag 21. The other structure of the packaging bag is the same as that of the packaging bag 1 of FIG.

Of course, the shape of the vapor extraction seal 3 can be appropriately changed to oval, square, trapezoidal or the like.

5 is a diagram illustrating another example in which the present invention is applied to a standing pouch.

In this packaging bag 31, the shape of the vapor extraction sealing part 3 was made into substantially square shape, and it connected and installed in the edge sealing part 2 of the corner part. In addition, the sewing eye 6 was formed in order to facilitate opening of the bag. The other structure of the packaging bag is the same as that of the packaging bag 21 of FIG.

It is a figure which shows the other example of the packaging bag for microwave ovens of this invention.

In this packaging bag 41, the notch 44 which becomes a weakening part toward the inside of a bag is provided in the corner part of the packaging bag 41, and the steam which has a weakening part by heat-sealing the peripheral edge part of the said notch 44 is provided. The extraction seal 43 was formed. Opening means 6 for sewing machine, laser processing, etc. are provided in the part distinguished from the main bag body by the notch 44 in the packaging bag 41, and the notch 5 is provided in the perimeter edge sealing part 2; It is installed. In this packaging bag 41, after completion | finish of heating by a microwave oven, the bag 41 is opened from the notch 5 along the opening means 6, and a spout port (not shown) can be formed.

7 is a perspective view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

In this packaging bag 51, the branch part 52 which can be folded is formed in one surface of the packaging bag main body. The notched portion 54 is provided in the upper edge portion of the branch portion 52 toward the inside of the bag, and the weakened portion is heat-sealed at the same width or narrower width as the peripheral edge sealing portion 2. The vapor extraction sealing part 53 which has is formed. In addition, in the vapor extraction seal 53 and the adjacent part 55 of this packaging bag 51, the label display means by a printing pattern is provided similarly to the packaging bag 1 of FIGS. .

Moreover, in the packaging bag 51 which provided this branch part 52, the branch part 52 and the part (counter part 56) which oppose the branch part 52 of the packaging bag main body of the branch part 52 In order to prevent the heat sealing of the packaging bag from peeling off at the base 58 and to prevent the bag from rupturing or leaking the contents, the opening preventing means 57 by heat sealing is provided in four places.

8 is a perspective view showing another example in which the present invention is applied to a packaging bag for a microwave oven.

In the packaging bag 51 of FIG. 7, this packaging bag 61 cuts the outer side along the outer periphery of the opening prevention means 57 provided in the branch part 52, and is produced. The other structure of the packaging bag 61 is the same as that of the packaging bag 51 of FIG.

In the example of Figs. 1 to 8, an example in which the present invention is applied to a packaging bag for a microwave oven has been described. However, the present invention can be applied to packaging containers for microwave ovens other than packaging bags such as cups, trays and boxes. Of course.

In such containers, the flange part is provided in a container, the vapor extraction seal part which has a weakening part is formed in a flange part, and the mark expression means of this invention can be provided in the said vapor extraction seal part or its vicinity.

9 to 11 are diagrams showing an example in which the present invention is applied to a tray-type microwave container. 9 is a perspective view of the container, and FIG. 10 is a plan view of the container. 11A and 11B are schematic diagrams showing a cross section of the vapor extraction seal of the container, and FIG. 11A is a view showing a state before peeling off of the vapor extraction seal, and FIG. 11B shows a state after peeling off of the vapor extraction seal. It is a figure.

In this microwave packaging container 100, the container is sealed by heat-sealing the lid 103 to the flange portion 102 of the container body 101 made of polypropylene. At one corner portion of the vessel, the vapor extraction seal portion 113 is formed by projecting the circumferential edge heat seal portion 112 in a U shape toward the inner side of the vessel. In addition, the corner 103 facing the vapor extraction sealing portion 113 protrudes in a V shape toward the outer side of the container, thereby opening the lid 103 after heating and cooking the container in a microwave oven. The opening part 115 for forming is formed.

The lid 103 of this packaging container 100 is a polyethylene telephthalate (PET) 121 / printing layer 122 / adhesive layer 123 having a thickness of 12 μm in order from the outside, as shown in FIGS. 11A and 11B. It is comprised by the easy peel layer 125 which consists of nylon 124 / adhesive layer 123 of thickness 15micrometer / adhesive-free polypropylene resin (CPP) of thickness 50micrometer. The lid 103 is heat-sealed with the flange portion 102 of the container body in the easy peel layer 125.

When the vessel is heated by a microwave oven, the internal pressure of the vessel increases due to water vapor generated from the contents filled in the vessel, and the easy-fill layer 125 of the heat seal portion is formed from the tip of the vapor extraction seal portion 113 protruding in a U shape. CPP constituting) is cohesively broken and peeling of the vapor extraction seal 113 starts. When the internal pressure of the container further rises and peeling from the tip of the vapor extraction seal 113 reaches the outer edge of the heat seal, the heat seal is opened, as shown in FIG. 11B.

Accompanying the peeling of the heat sealing portion in the vapor extraction sealing portion 113, irregularities are formed on the cohesive fractured CPP peeling surface to roughen the surface. In addition, due to a phenomenon such as stress whitening, the CPP peeling surface changes from transparent to white opaque, and a white opaque layer 126 is formed on the surface of the easy-fill layer 125. As a result, since the lower layer of the printing layer 122 of the lid 103 is in the state of being white-coated, the printing of the peeled-off part will appear in a color different from the peripheral part, and it becomes easy to identify. Even when the printed layer 122 of the lid 103 is omitted, the white opaque layer 126 formed by the peeling of the heat seal is identifiable, but in order to identify more clearly, the printed layer 122 is provided. It is preferable.

The layer structure of the lid 103 is not limited to the above, and can be changed as appropriate. As an example of another layer structure of the lid 103, for example, the ethylene vinyl alcohol copolymer of nylon 121 / printing layer 122 / adhesive layer 123 / thickness 12 micrometers of thickness 15micrometer in order from the outer side, for example. (124) / adhesive layer 123 / what consists of the easy-fill layer 125 which consists of polyolefin resin of 50 micrometers in thickness is mentioned. It goes without saying that the number of layers constituting the lid 103 may be increased or decreased. The printing layer may be provided not only on the vapor extraction seal 113 but also on the adjacent portion or the entire surface of the lid 103. There is no restriction | limiting in particular as an adhesive agent interposed between each layer which comprises the lid 103, A normal thing, such as a polyurethane adhesive and an acid-modified polyolefin adhesive, can be used.

In addition, the flange portion 102 of the container body may be printed or colored as desired. The shape and dimensions of the container body can be any, and can be, for example, a cylindrical cup, a rectangular tray, a box, or the like.

The sealing strength of the circumferential edge sealing part and the vapor extraction sealing part of the packaging container for a microwave oven of this invention can be made into 2.3 kg / 15 mm width or more.

In a conventional packaging container that is automatically opened at the time of microwave heating, the sealing strength of the opening at the time of heating is remarkably decreased, so that a sealing strength of 2.3 kg / 15 mm or more required for the retort food packaging container cannot be obtained. In the packaging container for a microwave oven of this invention, the sealing part itself of the peripheral edge sealing part of a container, or the vapor extraction sealing part does not use the material whose sealing strength falls at the time of heating. In addition, since the processing which the sealing strength falls at the time of heating to a sealing part is not performed, it becomes possible to maintain the said sealing strength.

As a result, when retorting the packaging container after filling the packaging container with the contents, the packaging container does not burst from the vapor extraction seal or the peripheral edge seal. In addition, it is possible to prevent the packaging container from being damaged during transportation or storage of the packaging container.

Moreover, even when it heats in a microwave oven, the vapor extraction seal | sticker part of a packaging container maintains sealing strength for a certain time, and the internal pressure in a packaging container is kept high by the water vapor. Therefore, since the heating decay effect with respect to the content of a packaging container is acquired, the remarkable effect that the taste of the content is improved and the cooking time of the content can be shortened.

Claims (15)

In the packaging container for a microwave oven provided with the vapor extraction sealing part which has a weakening part in the packaging container sealed by heat sealing a plastic film, A packaging container for a microwave oven, characterized by having a mark extracting means provided at a vapor extraction seal in a peeling opening of the vapor extraction seal to recognize the packaging material at the front and back of the vapor extraction seal as different. The vapor extraction seal of one plastic film constituting the packaging container according to claim 1, wherein a printing layer having a shape having an outline part is provided, and the vapor extraction of the other plastic film constituting the packaging container is performed. A packaging container for a microwave oven, wherein a label display means is formed by providing a printing layer having a shape corresponding to the outline portion in the sealing portion. 2. The second method according to claim 1, wherein the vapor extraction seal of the one plastic film constituting the packaging container is colored in a first color, and the vapor extraction seal of the other plastic film constituting the packaging container is different from the first color. A packaging container for a microwave oven, comprising a label display means by coloring with color. delete delete The packaging container for a microwave oven according to any one of claims 1 to 3, wherein the vapor extraction sealing part is connected to a peripheral edge sealing part of the packaging container and installed. The packaging container for a microwave oven according to any one of claims 1 to 3, wherein the vapor extraction sealing part is provided separately from the circumferential edge sealing part of the packaging container. The microwave packaging container according to any one of claims 1 to 3, wherein the weakening portion is formed by providing a through hole, a semi-through hole, or a slit in the vapor extraction seal portion. The vapor extraction sealing part according to any one of claims 1 to 3, wherein a notch is provided in the packaging container toward the inside of the container, and a heat extraction seal having a weakening part is formed by heat-sealing the peripheral edge of the notch. Packaging containers for microwave ovens. The microwave packaging container according to any one of claims 1 to 3, wherein a spout forming means is provided in the vicinity of the vapor extraction seal. The packaging container for a microwave oven according to any one of claims 1 to 3, wherein the packaging container is a packaging bag sealed by heat sealing a plastic film. The packaging container for a microwave oven according to claim 11, wherein the packaging bag is a standing pouch. The packaging container for a microwave oven according to claim 11, wherein the packaging bag is a packaging bag having a branching portion. The packaging container for a microwave oven according to any one of claims 1 to 3, wherein the packaging container is sealed by heat sealing a lid made of a plastic film to a container body having a flange portion. 15. The packaging container for a microwave oven according to claim 14, wherein the vapor extraction seal portion is formed by protruding the flange portion of the packaging container and the heat seal portion of the lid toward the inner side of the container.

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