JPH09142541A - Receiving bag for food to be heated in microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To unseal a bag without large break noise generated at the time of heating the bag in a microwave oven and also easily manufacture the bag. SOLUTION: When a center sealed part 13 is formed by heat-welding by overlaying respective side rims of a nylon-polyethylene film, a temperature at the center is made to be lower than that at both sides to provide a lowly adhesive part 13b at the center where adhesion is weak while both sides of it are made to be highly adhesive parts 13a having strong adhesion. A bottom sealed part 14 has been heat-welded so that appropriate linear gaps are formed in parallel, resulting in breathability between inside and outside of a receiving bag 10. When the bag is heated in a microwave oven, since a part of steam inside is exhausted outside through the breathable bottom sealed part 14, steam pressure inside gently rises, and the lowly adhesive part 13b of the center sealed part 13 loses its adhesion without large break noise generated to be unsealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage bag in which food that is heated in a microwave oven is stored. In particular, by heating the food in a microwave oven, a part of the bag is opened without making a loud popping sound. The present invention relates to a storage bag for food for heating a microwave oven.

[0002]

2. Description of the Related Art Frozen foods and chilled foods are usually sold in a plastic film containing bag. Such frozen foods are usually stored in an electronic form with the foods taken out of the storage bag and placed on a plate, or if necessary, with the frozen foods placed on the plate covered with wrap. It is designed to be heated in the microwave.

However, recently, a special construction in which a part of the seal portion is easily opened so that the frozen food or the like can be directly heated in a microwave oven in a storage bag. A storage bag that has been developed is being developed. In such a storage bag, when the food is heated by the microwave oven and the steam pressure in the storage bag rises, a part of the storage bag is opened by the steam pressure and the steam inside is discharged. ing.

[0004] In such a bag, for example, a part of the bottom seal part to be heat-welded or a part of the seal part provided on the back surface is adhered by an adhesive tape or a film which is easily peeled off by heating. However, an adhesion portion weaker than the seal portion formed by heat welding is provided. With such a configuration, when the sealed storage bag containing frozen food is heated in the microwave oven, the adhesive force is weakened by the adhesive tape, the special film, etc. due to the water vapor pressure in the storage bag. Is opened, and water vapor is discharged from that part. As a result, there is no risk of the entire storage bag being ruptured, and the food inside can be easily taken out by utilizing the opened portion.

[0005]

In such a storage bag, since the adhesive strength of a part of the seal portion is reduced by using an adhesive tape or a special film, the bag is
There is a problem that an adhesive tape or a special film must be interposed between the plastic films stacked so as to be heat-welded, and thus it cannot be easily manufactured.
In addition to the plastic film used for manufacturing the storage bag, an adhesive tape or a special film must be used, which causes a problem of high manufacturing cost. Furthermore, when the water vapor pressure in the storage bag rises, a part of the seal part where the adhesive strength is weakened bursts, and steam is rapidly discharged from the burst part, which may cause a loud popping noise. is there.

The present invention is intended to solve such a problem, and an object thereof is to manufacture a microwave oven which is extremely easy to manufacture, has no possibility of producing a large burst sound, and is excellent in economical efficiency. To provide a bag for storing food.

[0007]

A bag for storing food for heating a microwave oven according to the present invention is formed into a bag shape by heat-sealing necessary portions of a plastic film to form a seal portion, and an electronic bag is formed inside the bag. A microwave-heated food storage bag containing food for microwave oven heating, wherein the seal portion is a high-adhesive portion having strong adhesiveness that is heat-welded by high temperature, and the food is heated in a microwave oven. It is characterized in that it has a weakly adhesive low-adhesion portion heat-welded at a low temperature so as to be opened by the water vapor pressure at that time.

A part of the high-adhesion portion may have air permeability so that the inside and the outside communicate with each other, but the seal portion may be in a hermetically sealed state as a whole.

In the bag for storing food for heating a microwave according to the present invention, the food is directly heated by the microwave while the food is stored in the bag. Then, when the water vapor pressure inside rises,
Only the low-adhesion portion of the seal portion is released and the portion is opened. In this case, the high adhesion part
If the part of the highly bonded part that does not become the opened state has air permeability while maintaining the adhesive state, part of the water vapor will
Since it is discharged from the air-permeable seal portion, the water vapor pressure inside is suppressed from rising rapidly, and the water vapor pressure rises gently. Therefore, the generation of a burst sound when the low-adhesion portion is unbonded and opened is more reliably suppressed.

Since the entire seal portion is in an airtight state, hygienic safety is surely ensured.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a bag for storing food for heating a microwave according to the present invention, in which a frozen food 20 such as frozen rotary baked is contained. The storage bag 10 is made of a rectangular nylon-polyethylene film, and is made up of a front portion 11 formed by the central portion of the nylon film and side portions of the nylon-polyethylene film. And a back surface portion 12 facing each other. Back part 12
In the central portion of the above, a linear central seal portion 13 is provided in which the respective side edge portions are overlapped and heat-welded.

Each end portion in the longitudinal direction of the central seal portion 13 excluding the central portion in the longitudinal direction is heat-welded at a high temperature of, for example, about 140 to 180 ° C. to a highly adhesive portion 13a adhered by a strong adhesive force. Each is. On the other hand, the central portion in the longitudinal direction of the central seal portion 13 is heated at a temperature of about 90 to 120 ° C., which is about 60 ° C. lower than the temperature at the time of heat welding to form the high adhesion portion 13 a at each end. The low adhesion portions 13b are welded and adhered by a weaker adhesive force than the high adhesion portions 13a.
The high-adhesion portions 13a and the low-adhesion portions 13b are in an airtight state, so that the central seal portion 13 as a whole is in an airtight state.

One edge of the front portion 11 of the accommodation bag 10 and the edge of the back portion 12 facing the edge are overlapped with each other and heated to a high temperature of, for example, about 140 to 180 ° C. The bottom seal portion 14 is in a highly adhered state by being heat-welded and adhered by a strong adhesive force. In the bottom seal portion 14, linear gaps along the inside and outside directions of the accommodation bag 10 are formed at equal intervals in a direction orthogonal to the inside and outside directions, and therefore the bottom seal portion 14 is It is breathable so that the inside and the outside of the accommodation bag 10 are in communication with each other.

The end portion on the side opposite to the bottom seal portion 14 is, for example, 140 to 140 like the high adhesion portions 13a of the central seal portion 13 after the frozen food 20 such as frozen rotary bake is stored.
The opening seal portion 15 is in a highly adhered state, which is heat-welded at a high temperature of about 180 ° C. and adhered in an airtight manner by a strong adhesive force.

In such a bag 10, when the side edges of the nylon film are heat-welded to each other to form the central seal portion 13, the portion corresponding to the low-adhesion portion of the hot plate used for heat-welding is formed. The side edges of the nylon-polyethylene film are heat-welded to each other in a state where a tape or the like is adhered to and the heating by the hot plate is suppressed by the adhered tape or the like. As a result, in the central seal portion 13, the central portion becomes the low adhesive portion 13b having a weak adhesive force, and the both sides of the low adhesive portion 13b become the high adhesive portion 13a having a strong adhesive force.
In addition, the bottom seal portion 14 is in a state having air permeability due to the linear gap by heat welding using a hot plate on which a large number of parallel ridges are formed.

The storage bag 10 having such a structure is directly heated by a microwave oven while the frozen food 20 such as frozen rotary bake is stored inside. The back surface 12 of the accommodation bag 10 is placed in the microwave oven with the back surface 12 facing upward. When the frozen food 20 is heated by the microwave oven, the frozen food 2
0 is thawed, and the thawed water is further heated to become steam. Then, by further heating the water vapor, the water vapor pressure inside the accommodation bag 10 rises, and the accommodation bag 10 is in an expanded state. At this time, the storage bag 10
A part of the water vapor inside is discharged to the outside through a linear gap provided in the bottom seal portion 14. Therefore, the storage bag 10
The sudden increase in the water vapor pressure inside is suppressed, and the water vapor gradually rises.

In this state, when the water vapor in the storage bag 10 is further heated and the water vapor pressure rises, the back surface portion 1
The second central seal portion 13 is in a state of bulging outward. In particular, the low-adhesion portion 13b at the center of the seal portion 13 is in a state of largely bulging outward. Then, further, the storage bag 1
When the water vapor pressure of 0 rises, the low-adhesion portion 13b at the central portion of the seal portion 13 swells further to the outside, the low-adhesion portion 13b is released from the adhesion, and the low-adhesion portion 1
3b is opened.

At this time, since water vapor is discharged from the airtight bottom seal portion 14 of the accommodation bag 10, when the seal of the low-adhesion portion 13 is released and the water vapor is rapidly opened to the outside. There is no danger of being ejected, and therefore a loud explosion sound is reliably prevented from occurring.

When the frozen food 20 in the storage bag 10 is thawed and further heated, the storage bag 10 in which the low-adhesion portion 13b provided in the central portion of the back surface portion 12 is opened is ( It is taken out of the microwave with the (frozen) food 20. The accommodation bag 10 is largely opened by utilizing the opened low adhesion portion 13b in the central portion of the back surface portion 13, and the heated (frozen) food 20 inside is taken out.

As described above, by providing the low-adhesion portion 13b in a portion that easily bulges outward when heated by the microwave oven, the accommodation bag 10 can be reliably opened.

FIG. 2 is a perspective view showing another example of the embodiment of the bag for containing food for heating a microwave according to the present invention. The microwave bag heating food bag 10 includes a bottom seal portion 14
Is adhered in an airtight state that is not breathable. Therefore, all the seal parts, that is, the central seal part 13, the bottom seal part 14, and the opening seal part 15 are in an airtight state.

As described above, since the seal portion is in a hermetically sealed state as a whole, hygienic safety is surely ensured.

FIG. 3 is a perspective view showing still another example of the embodiment of the bag for containing food for heating a microwave according to the present invention. In this bag 30 for storing food for heating in a microwave oven, one film is folded in half along a center line 31, and a portion in the vicinity of the center line 31 is folded into a W shape between the films. Heat sealed and bottom seal 32
It has become. Further, each side edge portion is also heat-sealed to form a side edge seal portion 33. One side edge seal portion 33
Is a low-adhesion portion 33b that is heat-sealed at a temperature near the central portion at a lower temperature than the other portions.
Both sides of the low adhesion portion 33b of No. 3 are high adhesion portions 33a. The other side edge seal portion 33 and bottom seal portion 32 are also in a highly adhered state. The upper edge of the storage bag 30 is heat-sealed so as to be in a highly adhered state in a state where a suitable frozen food is stored in the storage bag 30 to form an opening seal portion 34.

The accommodating bag 30 having such a structure is self-supporting and, unlike the palm bag such as the accommodating bag 10 shown in FIGS. 1 and 2, is a three-sided bag whose entire peripheral edge is sealed. Although it is a bag, the accommodation bag 10 shown in FIG. 1 and FIG.
Similarly, when heated in a microwave oven, the water vapor of the frozen food contained therein causes one side edge seal portion 33
The low-adhesion portion 33b is unsealed and opened.

Also in this case, the high adhesive portion 33a of the side edge seal portion 33 in the high adhesive state, the other side edge seal portion 33,
Any of the opening seal portions 34 may be in a breathable state.

The material of the plastic film forming the accommodating bag is not particularly limited. In addition, the low adhesion portion formed by lowering the temperature during heat welding has an adhesive strength of appropriate strength by appropriately setting the temperature during heat welding depending on the type of film. It Further, the length of the low-adhesion portion and the like are also appropriately set depending on the shape, type and the like of the food contained inside.

Further, the storage bag can be manufactured by automatically heat-sealing a predetermined seal portion in a state in which frozen food or the like is stored.

[0029]

As described above, in the bag for containing food for microwave oven heating according to the present invention, a part of the seal portion is heat-welded at a temperature lower than that of the other seal portions to become a low-adhesion portion having a weak adhesive force. Therefore, when the food for microwave oven heating is heated by the microwave oven, the low-adhesion portion is opened by the internal water vapor pressure without generating a large popping sound. Moreover, since it is not necessary to use a special material and a special device is not necessary, it can be easily manufactured and is economical.

Further, by making part of the high-adhesion portion air-permeable, it is possible to more reliably prevent the generation of a burst noise when opening. On the contrary, by keeping the sealed portion airtight, hygienic safety is ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a bag for containing food for heating a microwave according to the present invention.

FIG. 2 is a perspective view showing another example of the embodiment of the bag for containing food for heating a microwave according to the present invention.

FIG. 3 is a perspective view showing still another example of the embodiment of the bag for containing food for heating a microwave according to the present invention.

[Explanation of symbols]

 10 Storage Bag 11 Front Part 12 Back Part 13 Center Seal Part 13a High Adhesion Part 13b Low Adhesion Part 14 Bottom Seal Part 15 Opening Seal Part 20 Frozen Food 30 Storage Bag 31 Center Line 32 Bottom Seal Part 33 Side Edge Seal Part 33a High Adhesion Part 33b Low adhesion part 34 Opening seal part

Claims (3)

[Claims] 1. A bag for storing food for microwave heating, which is formed in a bag shape by heat-sealing necessary portions of a plastic film to form a seal portion, and food for microwave heating is stored inside. The seal part is heat-welded at a low temperature so that it is opened by the water vapor pressure when the food is heated in a microwave oven, and the high-adhesion part having strong adhesiveness that is heat-welded at a high temperature. A bag for storing food for heating in a microwave oven, which has a low-adhesion portion with weak adhesion. 2. The food bag for heating a microwave oven according to claim 1, wherein a part of the high-adhesion portion has air permeability that allows the inside and the outside to communicate with each other. 3. The bag for storing food for heating in a microwave oven according to claim 1, wherein the sealing portion is in an airtight state as a whole.