JPH1095472A - Packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the jetting or overflowing of soup or juice at the time of heating by a microwave oven by forming a weak sealing section of given pattern communicated with an inner section and an outer section of a pillow packaging bag on a back sealing central section and using an easy peel sealant for an inner low layer of the pillow packing bag. SOLUTION: A microwave oven packaging bag 10 is peeled vertically in the flow direction of a belt-shaped continuous film packaging material to form a back sealing section 2, and the end sealing is applied in the direction crossing perpendicularly the flow of the packaging material in the upper and lower or the front and rear of a content almost simultaneously with the filling of the content to form end sealing sections 3 and 4 and also cut off to form a pillow packaging bag 1. In the case either of end seal 3 or 4 is broken and the content is taken out, the back sealing section 2 is formed into a hutt seal bag for taking out the content easily. Also heat cooking is carried out by a microwave oven with the back sealing section 2 on the upper side to prevent soup or juice from jetting or overflowing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for a microwave oven, which is opened automatically when the vapor pressure in the packaging bag reaches a certain level to prevent rupture.

[0002]

2. Description of the Related Art In many cases, instead of removing cooked frozen foods, chilled foods, and the like from packaging bags and transferring them to tableware and heating and cooking them in a microwave oven, the entire packaging bags are heated and cooked and directly provided to a dining table. However, if the entire sealed container is cooked in a microwave oven, the water vapor generated from the contents will cause the packaging container to expand, rupture and scatter, causing not only the microwave oven or its surroundings to become dirty, but also the danger of burns. It is necessary to open a steam release hole or opening in a part of the packaging container with scissors, etc., but the operation is troublesome and it is difficult to make it thorough by displaying etc. There have been proposed various types of packaging bags for microwave ovens in which a steam release hole or opening is automatically formed. In Japanese Utility Model Laid-Open Publication No. 59-55170, as shown in FIG. 4 (a), a plurality of ventilation holes are provided on the upper surface, and a detachable sealing plug or a sealing wrap which can be attached and detached is attached to the holes. Alternatively, an attached packaging container has been proposed. Japanese Patent Application Laid-Open No. 63-138975 proposes a packaging container having a weak seal portion at an appropriate position of an end seal portion of a bag as shown in FIG. 4B. Further, Japanese Patent Application Laid-Open No. 4-40005 discloses that, as shown in FIG. 4 (c), a part of a sealing line for sealing a container is bent at an acute angle into a V-shape toward the inside of the container, There has been proposed a packaging bag or a packaging container comprising a cup and a lid material in which the pulling force due to the internal pressure is concentrated to facilitate opening. Furthermore, Japanese Patent Application Laid-Open No. 8-8097
No. 9, as shown in FIG. 4 (d), as shown in FIG. 4 (d), a water-absorbing paper is sandwiched so that moisture does not stick to the storage object by heating in a microwave oven, and a weak seal or non-sealing is applied to an end seal portion so as not to be ruptured by internal pressure. A packaging bag provided with a pressure relief portion such as a seal has been proposed.

[0003]

Problems to be Solved by the Invention
Although the packaging container described in Japanese Patent No. 55170 is preferably provided with a plurality of ventilation holes on the upper surface, there is a problem in that the operation of attaching a sealing stopper to the air vent hole or attaching a wrap is troublesome. Further, there is a problem that the pressure-sensitive adhesive and the adhesive come into contact with food and are not hygienic. JP-A-63-13
The packaging container described in JP-A-8975, in which a weak seal portion is provided at an appropriate position of the end seal portion of the flat bag, is good when the entire tray is packaged as shown in FIG. 4B, but the tray is not used. When a food with a high moisture content is packaged directly in a flat bag, there is a problem that the liquid juice comes out from the end seal portion together with the steam. The packaging container described in Japanese Patent Application Laid-Open No. 4-40005 has a problem that an extra sealing margin is required because a part of the sealing wire is bent, which leads to an increase in cost of the packaging material. The method described in Japanese Patent Application Laid-Open No. 8-80979 also has a problem that the liquid juice blows out from the end seal portion together with the vapor. The present invention has been made in view of the above-described problems, and does not spout or overflow liquid juice even when the contents are directly filled in a bag during heating and cooking with a microwave oven. Another object of the present invention is to provide a packaging bag for a microwave oven, which can be provided on a dining table together with the bag body, and which is inexpensive.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a pillow packaging bag for storing cooked frozen foods and the like, which is provided at the center of the back seal, which is sealed with the palms. A weak seal portion communicating with the outside is formed in a predetermined pattern, and an easy peel sealant is used for the innermost layer of the pillow packaging bag.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is an external view of a packaging bag for a microwave oven according to the present invention. In the packaging bag 10 for a microwave oven according to the present invention, as shown in the perspective view of FIG. 1A, a strip-shaped long film packaging material is vertically sealed (center-sealed) in a flow direction to form a back seal portion 2, Substantially simultaneously with the filling of the contents, an end seal is applied in the direction perpendicular to the flow of the packaging material at the top and bottom or before and after the contents to form end seals 3 and 4, which are cut off and separated from the pillow packaging bag 1. Become. Generally, there are an envelope sticking method and a gas seal method for the vertical seal. The gasket seal method is adopted for the microwave oven packaging bag 10 according to the present invention. In FIG. 1A, the back seal portion 2 is drawn in the center of the pillow packaging bag 1, but may be slightly shifted toward the side. 1B becomes easier to take out the contents if any one of the end seal portions 3 and 4 is broken, and FIG. 1B shows xx in FIG. 1A.
It is sectional drawing and the back seal part 2 is a gas seal. Also, a state in which the liquid juice L has accumulated in the lower part at the stage where thawing has progressed is shown. Note that the back seal portion 2 may be tilted in any direction and sealed together with the end seal portions 3 and 4 at the end portion of the packaging bag 10 for a microwave oven according to the present invention. The overlap of the end seal 3 is 4
The end seal portions 3 and 4 may be sealed independently without falling down the back seal portion 2.

FIG. 2 is an explanatory view of a weak seal portion provided on the back seal portion. Microwave packaging bag 1 according to the present invention
The point of 0 is that the weak seal portion 5 communicating with the inside and outside of the pillow packaging bag 1 is formed in the back seal portion 2 in a predetermined pattern. The optimal position where the weak seal portion 5 is provided is the central portion A of the back seal portion 2 shown in FIG.
Since this portion is located at the highest position when cooking by heating in a microwave oven, even if the heated steam breaks and blows out a part of the back seal portion 2, it does not blow out to the liquid juice L inside. As shown in FIG. 2, the shape of the weak seal portion 5 provided on the back seal portion 2 is any shape as shown in FIGS. 2 (a) to 2 (c) as long as it can communicate between the inside and the outside of the pillow packaging bag 1. Alternatively, as shown in FIG. 2D, a weak seal portion 5 may be provided except for a small back seal portion 2 without completely communicating between the inside and the outside. Further, FIG.
As shown in (e), the back seal portion 2 may be formed with the nonwoven fabric 6 interposed therebetween, and a ventilation path may be formed from the beginning.

The weak seal portion 5 is formed by a heat seal type having a pattern as shown in FIG. 2, that is, a back seal portion 2 using a heat seal jaw in which a concave portion is formed in a pattern of the weak seal portion 5. May be sealed. In this case, since the heat sealant layer is provided on the inner surface of the pouch packaging material, the hatched portion heated and pressurized by the seal jaw strongly adheres, but the non-pressed recessed portion does not have heat conduction but does not have heat conduction. Temporary adhesion occurs due to copying heat. Therefore, in the case of cooking by a microwave oven, when the internal pressure increases and reaches a certain level, tension acts on the back seal portion 2 from the inside, the weak seal portion 5 peels off, and heated steam is ejected through the peeled gap. . Since the location where the squirting occurs is at the highest point of the pouch package, even for foods with a large amount of liquid juice L, the contents do not squirt or overflow with the steam. In addition, if the content food is close to a fluid, it is preferable to fill the tray in advance and then package it in the microwave packaging bag 10 according to the present invention. In other cases, the use of the tray is rather over-packaged, Microwave packaging bag 10 according to the present invention
The use of a simple substance is economically preferable.

FIG. 3 is an explanatory view when the packaging bag for a microwave oven according to the present invention is opened. The microwave packaging bag 10 according to the present invention can be taken out in a state where at least the weak seal portion 5 provided substantially at the center of the back seal portion 2 is broken after heating and cooking by the microwave oven, or placed on a tray. Taken out. Opening some of the end seal portions 3 and 4 from the broken seal portion 5 to the back seal portion 2, as shown in FIG. 3, can open the seal. This heat-sealed portion can be peeled off when the packaging material has an appropriate tension and a polyolefin-based resin is used as a sealant on the inner surface. Particularly, an easy peel sealant (EPS) layer having good peelability is used. If the formed packaging material is used, it can be peeled off from the weakly sealed portion 5 to the state shown in FIG. 3 by hand very easily. Also,
The cooked food in the microwave packaging bag 10 according to the present invention can be used as it is on a dining table with its upper part largely opened. As a result, it is possible to save the time and effort for washing dishes and to save water. The food to which the microwave packaging bag 10 according to the present invention is applicable may be filled with uncooked meat, fish, vegetables and sauces, in addition to frozen and chilled cooked foods. By
By microwave heating, it can be closer to hot pot cooking.

The packaging structure of the packaging material that can be used in the packaging bag 10 for a microwave oven according to the present invention is as follows in order from the outside. (General specification) ON15 / DL / CPP50 (Retort type) ON15 / DL / LLDPEF50 (Boil type) PET12 / DL / ON15 / DL / CPP50 PET12 / DL / ON15 / DL / LLDPEF50 (Easy peel specification) EPL- a polypropylene EPS film manufactured by Tonen Chemical Co., Ltd.
11 (25 μm, 50 μm), EPL-13 (25 μm
m, 50 μm), manufactured by Tosero Co., Ltd., CMPS 013C
(30 μm, 50 μm) or the like. Here, each symbol means the following material, and the number represents μm. ON: Stretched nylon CPP: Unstretched polypropylene PET: Polyethylene terephthalate LLDPEF: Linear linear low density polyethylene film DL: Dry laminate adhesive layer

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Frozen cooked foods having a relatively large amount of juice, which are packaged in a pillow package with a tray, are refilled into a microwave oven packaging bag 10 according to the present invention, and five sample samples of the embodiment are produced. On the upper side, cooking was performed under microwave heating conditions as specified by the manufacturer (at 600 W for 3 minutes and 30 seconds). On the other hand, five commercially available pouch-packed samples were prepared as comparative examples, and scissors were cut into the end seal portions before cooking by heating in a microwave oven. In addition, pillow packaging bags having the following specifications were used for the example samples. Pillow packaging bag dimensions: 230 × 160mm, back seal width: 10mm Back seal condition: 190 ° C., 1 second Weak seal part pattern: See FIG. 2 (a) Weak seal part width: 15mm Laminated structure: PET12 / DL / ON15 /
DL / EPL-11, 25 As a result of the microwave cooking test under the above conditions, two out of five comparative sample samples showed spouting of juice, whereas the example sample did not. There was none. Furthermore, in the case of the comparative example, the back seal portion was not broken and it was difficult to open the back seal portion by hand, and the contents food had to be transferred to the tableware. However, in the case of the example sample, as shown in FIG. The upper part was fully opened by hand.

[0011]

According to the packaging bag 10 for a microwave oven according to the present invention, cooking with a microwave oven is performed with the back seal 2 provided with the weak seal portion 5 facing upward, so that the contents having a large amount of juice can be obtained. However, since it does not spout or overflow with the heated steam, the microwave oven and its surroundings are not stained and a clean kitchen can be maintained.
In addition, it is not necessary to make a cut each time using an instrument such as scissors, so that labor can be saved. In addition, since the upper part of the pouch package 1 can be largely opened from the back seal portion 2 without using any utensil, the pouch packaging bag can be served on a dining table, saving time and effort for washing dishes and saving water. Effect occurs.

[Brief description of the drawings]

FIG. 1 is an external view of a packaging bag for a microwave oven according to the present invention.

FIG. 2 is an explanatory view of a weak seal portion provided in a back seal portion.

FIG. 3 is an explanatory view at the time of opening the packaging bag for a microwave oven according to the present invention.

FIG. 4 is an explanatory view of a conventional packaging bag for a microwave oven.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillow packaging bag 2 Back seal part 2 'Peeled seal part 3, 4 End seal part 5 Weak seal part 6 Nonwoven fabric 10 Microwave oven packaging bag according to the present invention A Center part of back seal part D Receppan F Heat-cooked Food L Juice

Claims (2)

[Claims] 1. A weak seal portion communicating with the inside and the outside of the pillow packaging bag is formed in a predetermined pattern at the center of the back seal of the pillow packaging bag for storing cooked frozen foods and the like, which is sealed with the palms. Characteristic packaging bag for microwave oven. 2. The packaging bag for a microwave oven according to claim 1, wherein an easy peel sealant is used in the innermost layer of said pillow packaging bag.