JPH10139076A - Cooking bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use paper for a cooking bag for the microwave oven so that simplified sealing to make the bag permeable to air to a suitable degree is applicable and, on the other hand, to secure joint strength along the two side edges and reduce the cost. SOLUTION: A self-supporting bag is obtained by tucking in bottom parts 3 in the shape of an inverted letter V in section between the front and rear wall parts 1, 2, joining the front and rear wall parts 1, 2 by thermal fusion along the two side edges, and joining the bottom parts 3 to the front and rear wall parts 1, 2 along the two side edges by thermal fusion. The front wall part 1 is formed by laying a paper material 7 on the inner side of a heat- resistant synthetic resin film with a downward slippage by a specified measure from the upper end of the bag and joining the paper material 7 to the film along the upper and lower end edges. A bending perforation 10 is provided in the film and the paper material 7 where there are not sealed. For the front wall part 1, it can be made of one formed by joining two sheets of film laid one up and the other thereunder to the paper material 7 at intervals along the upper and under end edges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking bag for a microwave oven used for cooking food in a microwave oven.

[0002]

2. Description of the Related Art In the cooking of foods using a microwave oven, a microwave oven-specific container made of a molded article of a heat-resistant synthetic resin is generally used. However, there is a demand for making cooking with a microwave oven easier, and therefore, a cooking bag for a microwave oven made of a heat-resistant synthetic resin film has been considered. The cooking bag for a microwave oven disclosed in JP-A-7-291366 is one example.

[0003] Japanese Unexamined Patent Publication No. 7-291366 discloses a cooking bag for a microwave oven made of a heat-resistant synthetic resin film, which is a self-supporting bag, and at least one of the front and rear walls at the top of the bag is made of paper. According to this, by inflating the bottom part into a substantially boat bottom shape, it is possible to stably hold the cooking material in the center of the bottom part in a self-standing state with the cooking material stored therein, and the paper material is used for the self-supporting state. As a result, it is possible to hold the bag in a simple sealed state by simply bending the upper end of the bag, and also to prevent excessive discharge of steam generated during heating and cooking to increase the internal pressure, thereby improving the self-supporting state. The bag is expanded appropriately, and the convection of the seasoning liquid and soup stock is performed well. In addition, a gap is generated in the folded portion of the paper material due to an increase in the internal pressure to some extent. And paper material itself excess steam by ventilation is discharged to the outside, the bag interior is kept moderate pressure,
It is said that an appropriate cooking temperature is continuously maintained, the internal pressure is not excessively increased, and the bag is not broken during cooking.

[0004]

When a paper material is arranged on at least one of the front and rear walls of the upper part of a cooking bag for a microwave oven made of a heat-resistant synthetic resin film, the paper material on the upper part of the bag is bent. It can be easily sealed to have a proper air permeability, and can maintain a suitable internal pressure and heating temperature during cooking. However, when the paper material is used in the upper portion of the bag in this manner, the conventional idea shown in the above-mentioned publication is that, for example, the upper portion of one wall portion is made of paper material, and the lower edge of the upper portion is made lower by heat sealing means or the like. It is to be joined with the synthetic resin film of the above, and this is joined to the other wall portion made of the synthetic resin film at both side edges, in which case, the joint at the both side edges of the bag upper part is made of paper and synthetic resin film Therefore, the bonding becomes weaker than the bonding between ordinary films, and when the usage is rough, the film may be peeled off from the upper end of the bag, which may hinder cooking. In addition, when using an expensive material having water repellency as a paper material,
If the upper part of the wall is made of a paper material up to the upper end, the cost increases.

Therefore, a cooking bag for a microwave oven made of a heat-resistant synthetic resin film can be easily sealed by arranging a paper material on an upper portion of the bag so as to have a proper air permeability, and the front and rear walls thereof can be sealed. The challenge is to ensure the joint strength of both side edges of the part.

In addition, a cooking bag for a microwave oven made of a heat-resistant synthetic resin film can be easily sealed with a proper air permeability by arranging a paper material on an upper portion of the bag, and the cost is reduced. The challenge is to reduce it.

An object of the present invention is to solve such a problem.

[0008]

According to the present invention, a cooking bag for a microwave oven has front and rear walls and a bottom made of a heat-resistant synthetic resin film, and the front and rear walls are joined at both side edges to form a cooking bag. The bottom portion is folded in and joined at both side edges to be self-supporting, and at least one of the front and rear wall portions is bent at the top of the bag excluding the upper end portion to have a paper material having a holding property. Features.

When at least one of the front and rear wall portions of the upper portion of the cooking bag for a microwave oven made of a heat-resistant synthetic resin film has paper material, the portion of the paper material at the upper portion of the bag is bent. It can be easily sealed to have a proper air permeability, and can maintain a suitable internal pressure and heating temperature during cooking.

Further, since there is no paper material at the upper end portion of the bag, the joints on both side edges of the upper portion of the bag become strong joints between the synthetic resin films, and therefore, stable cooking becomes possible. Further, even if the paper material is expensive such as having water repellency, the use range can be limited to the minimum range for maintaining the simple sealed state, so that the cost can be reduced.

The cooking bag for a microwave oven can be stably held in a self-supporting state by inflating the bottom in a substantially boat bottom shape and storing the cooking material in the center of the bottom. And
There is a gap in the bent part of the paper material, and the paper material itself has breathability, so that the inside of the bag can be kept at a moderate internal pressure during heating and cooking, and the bag itself can be expanded appropriately. In addition, the convection of the seasoning liquid and the broth can be improved, and bag breakage due to excessive internal pressure can be prevented.

More specifically, the cooking bag for a microwave oven is, for example, a tape made of the paper material, and the tape-shaped paper material is stacked on the inside of the synthetic resin film so as to reach both side edges of the wall portion. The upper and lower edges are joined to the synthetic resin film, and the synthetic resin film is provided with a linear perforation reaching the side edges of the wall at a position sandwiched between upper and lower joints of a portion overlapping with the paper material. I do. Furthermore, it is good to provide a linear perforation at the same position on the paper material.In such a case, the tape material is to be taped on a synthetic resin film and then perforated on the overlapping part. As a result, the manufacturing is simple, the bending is easy, and the bending retention is improved.

Further, the cooking bag for a microwave oven may be such that at least one wall portion is formed by joining the above-mentioned paper material in a tape shape and joining two synthetic resin films above and below at an interval. Good. In this case, the tape-shaped paper material preferably has a linear perforation reaching the both side edges of the wall portion at a position sandwiched between the joining portions with the upper and lower synthetic resin films. With the perforations, it is easy to bend the upper part of the bag, and the bendability is improved.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of a cooking bag for a microwave oven according to the present invention will be described with reference to FIGS. 1 is a front view of a cooking bag for a microwave oven, FIG. 2 is an enlarged sectional view taken along line YY of FIG. 1, and FIG. 3 is a perspective view showing a state where a bottom portion of the cooking bag for a microwave oven of FIG. is there.

The cooking bag for a microwave oven shown in FIGS. 1 to 3 is folded in an inverted V-shaped cross section between the front wall 1 and the rear wall 2 facing each other and between the front wall 1 and the rear wall 2. The front wall portion 1 and the rear wall portion 2 have seal portions 4a, 4 on both side edges.
b, and the both sides of the front and rear folded portions 3a, 3b of the bottom 3 are connected to the sealing portions 4a, 4b.
The front wall portion 1 and the rear wall portion 2 are respectively joined to the front wall portion 1 and the rear wall portion 2 by heat fusion at an extension of 4b.

The front wall 1 has a film 6 formed by laminating, for example, unstretched polypropylene as a sealant layer on a base material layer of polyester or the like, and a predetermined dimension below the upper end of the bag on the sealant layer side of the film 6 (FIG. 1). And a tape-shaped paper material 7 having air permeability and heat fusibility arranged so as to be displaced downward. After that, the portion between the upper and lower seal portions 8 and 9 is perforated to form a perforation 10 linearly reaching the side edges of the wall at the same position with respect to the film 6 and the paper material 7. It was done. The paper material 7 is desirably subjected to a water-repellent treatment.

On the other hand, the rear wall 2 is provided with the film 6 of the front wall 1.
Similarly to the above, the sealant layer is formed of a film obtained by laminating, for example, unstretched polypropylene on a base material layer of polyester or the like, and the bottom 3 is also formed of a film having the same laminated structure. The front and rear folded portions 3a and 3b of the bottom 3 have cutouts 11a, 11b; 1 at the lower portions of a total of four front and rear and left and right sides located at the extended portions of the seal portions 4a and 4b on both side edges.
2a and 12b are provided, and the sealant layer surfaces of the front wall portion 1 and the rear wall portion 2 can be joined at this position.

The front wall 1 and the rear wall 2 and the bottom 3
Is a state in which the front wall portion 1 and the rear wall portion 2 are overlapped with the sealant layer side inside, and the bottom portion 3 is folded with the sealant layer side inside the bag (side facing the front and rear wall portions 1 and 2). , The sealing portions 4a and 4b on the both side edges and the sealing portion 5 on the extension thereof.
a, 5b are subjected to a heat sealing process, whereby
The front wall portion 1 and the rear wall portion 2 are joined by seal portions 4a and 4b on both side edges, the front folded portion 3a of the bottom portion 3 is joined to the front wall portion 1 on both side edges, and the rear folded portion 3b is joined on both side edges. At the rear wall 2. Also, at the positions of the notches 11a, 11b; 12a, 12b on both side edges of the bottom 3, the front wall 1 and the rear wall 2 are joined. Thereafter, the sealing portions 4a and 4b on the both side edges and the sealing portion 5 on the extension thereof are formed.
Heat-sealing processing is performed again on each side end of the a and 5b, whereby the notches 11a and 11b on both side edges of the bottom 3 are formed.
b; At the positions of 12a and 12b, the front wall portion 1 and the rear wall portion 2 are more strongly joined and integrated.

At the lower end edge of the bag, where the front wall portion 1 and the rear wall portion 2 overlap the bottom 3 where the front wall portion 1 and the rear wall portion 2 are folded, heat sealing is performed so as to form front and rear seal portions 13a and 13b at the lower end edge of the bag. Also, a pair of front and rear seal portions 14a, 14b; 15a, 15 which reach the lower end edge of the bag 3 in an inclined manner inward and downward from both side edge positions of the upper end portion in the folding height direction of the bottom portion 3;
b, heat-sealing is performed to form these seal portions 13a, 13b; 14a, 14
b; front folded part 3 of bottom 3 at 15a, 15b
a is joined to the front wall portion 1 and the rear folded portion 3b is joined to the rear wall portion 2.

After the front wall 1, the rear wall 2 and the bottom 3 have been joined in this way, the one cut into a predetermined shape is shown in FIG.
Is a cooking bag for a microwave oven shown in FIG. The cooking bag for a microwave oven is substantially rectangular, and the corners on both sides at the lower end are obliquely cut out so as not to protrude when the bottom 3 is expanded.

As shown in FIG. 3, the cooking bag for a microwave oven has a bottom portion 3 expanded and inflated into a substantially boat-bottom shape, into which cooking ingredients, seasoning liquid, soup stock, and the like are put. Then, the front and rear wall portions 1 and 2 are integrally bent at the position of the perforation 10 as shown in FIG.

When the cooking bag for a microwave oven is used, the paper material at the top of the bag can be folded to be easily sealed to have a proper air permeability. Further, since the paper material 7 is not provided at the upper end portion of the bag, the bonding of the seal portions 4a and 4b on both side edges is strengthened, and the bag does not peel off from the upper end. Then, the amount of the paper material 7 can be reduced, and the cost can be reduced. Also,
In addition to being able to stably hold the microwave oven cooking bag in a self-supporting state, the inside of the bag is kept at an appropriate internal pressure during cooking, and the bag expands appropriately, so that the convection of seasoning liquid and soup stock can be prevented. It becomes better, and it is possible to prevent bag breakage due to an increase in internal pressure.

FIG. 4 is a front view of the upper part of a cooking bag for a microwave oven according to another embodiment of the present invention, and FIG. 5 is an enlarged cross-sectional view taken along line YY of FIG.

The microwave cooking bag shown in FIGS. 4 and 5 has a front wall portion 1 and a rear wall portion 2 facing each other, and the front wall portion 1 and the rear wall portion 2 similarly to the examples of FIGS. The front wall portion 1 and the rear wall portion 2 are heat-sealed and joined by the seal portions 4a and 4b on both side edges, and the bottom portion is folded back and forth. Both side edges of the portion are joined to the front wall portion 1 and the rear wall portion 2 by thermal fusion at extension portions of the seal portions 4a and 4b, respectively.

The front wall 1 is composed of two upper and lower films 6a and 6b each composed of a base material layer of polyester or the like and a sealant layer of unstretched polypropylene or the like, and a tape-shaped paper having air permeability and heat sealability. The upper film 6a is of a size constituting the upper end portion of the bag, and these two films 6a and 6b are separated by the sealing portions 8 and 9 at the upper and lower edges of the paper material 7 and are separated by heat. It is joined to the paper material 7 by fusion. Also in this case, it is desirable that the paper material 7 has been subjected to a water-repellent treatment. The rear wall portion 2 and the bottom portion 3 have the same configuration as the films 6a and 6b of the front wall portion 1, and the front and rear folded portions of the bottom portion 3 have the same cutouts (not shown) as in the examples of FIGS. ) Is provided. And also in this case, the front wall part 1, the rear wall part 2, and the bottom part are arranged similarly to the example of FIGS.

The cooking bag for a microwave oven shown in FIGS.
It is used in the same manner as in the examples of FIGS. However, in this bag, the front and rear wall portions 1 and 2 are bent at a portion where the paper material 7 is exposed to the outside. Also in this case, since the joining of the seal portions 4a and 4b on the both side edges of the upper end portion of the bag is strong, the seal portions 4a and 4b do not peel off from the upper end. In addition, it can be held in a self-standing state with good stability, the inside of the bag is kept at an appropriate internal pressure during cooking, the bag expands appropriately, and the convection of seasoning liquid and soup stock becomes good, Figure 1 shows that bags can be prevented.
This is the same as in Examples 3 to 3.

FIG. 6 is a front view of the upper part of a cooking bag for a microwave oven according to another embodiment of the present invention. FIG.
It is a Y enlarged sectional view.

The cooking bag for a microwave oven shown in FIGS. 6 and 7 is a portion of the cooking bag for a microwave oven shown in FIGS. The perforations 20 are formed in a straight line,
The method of use is also the same as in the examples of FIGS. In this case, the bag can be folded at the position of the perforation 20 with the front and rear wall portions 1 and 2 integrally, and simple sealing is easy. Other functions and effects are the same as those of the above examples.

FIG. 8 shows a modified example of the seal structure at both side edges of the bottom in each of the above examples. Reference numerals in the figure correspond to those in FIG.

In the example shown in FIG. 8, a notch is not provided at both side edges of the bottom 3 and a heat-sealable coating process such as polyvinylidene chloride coating is applied to the lower portion of each of the front and rear folded portions of the bottom 3 so that both sides are not cut. When the edges are heat-sealed,
The front folded portion of the bottom portion 3 is joined to the front wall portion 1 at both side edges, the rear folded portion is joined to the rear wall portion 2 at both side edges, and the front and rear folded portions of the bottom portion 3 are joined at the positions of both side edges. It was made. The simple sealing structure at the top of the bag may be any of the above examples.

In each of the above-described examples, an inclined seal portion is provided at each side of the bent portion of the bottom, in addition to the seal portions on both side edges, to join the front and rear folded portions of the bottom to the front and rear walls, respectively. However, this portion may be a triangular seal portion integrated with the seal portions on both side edges. Also,
In each of the above examples, the corners on both sides of the lower end of the bag are cut off diagonally, but it is not always necessary to cut out like this. Also,
In the embodiments shown in FIGS. 4 and 5, and in the embodiments shown in FIGS. 6 and 7, the upper and lower films are spaced apart from each other. By pasting, it is possible to form a cut line on a straight line which has the same air permeability as the perforation shown in the embodiment of FIGS.

[0032]

According to the present invention, a cooking bag for a microwave oven made of a heat-resistant synthetic resin film can be easily sealed in a state of maintaining a proper air permeability by arranging a paper material on an upper portion of the bag, and front and rear walls thereof. The joining strength of both side edges of the portion can be ensured, and the cost can be reduced by minimizing the paper material.

[Brief description of the drawings]

FIG. 1 is a front view of a cooking bag for a microwave oven showing an example of an embodiment.

FIG. 2 is an enlarged sectional view taken along the line YY of FIG.

FIG. 3 is a perspective view showing a state in which the bottom portion of the cooking bag for a microwave oven of FIG. 1 is expanded and its upper portion is bent.

FIG. 4 is a front view of an upper portion of a cooking bag for a microwave oven showing another example of the embodiment.

FIG. 5 is an enlarged sectional view taken along line YY of FIG. 4;

FIG. 6 is a front view of the upper part of a cooking bag for a microwave oven showing still another example of the embodiment.

FIG. 7 is an enlarged sectional view taken along line YY of FIG. 6;

FIG. 8 is a view showing a modified example of the seal structure on both side edges of the bag bottom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wall part 2 Back wall part 3 Bottom part 4a, 4b Seal part (both edges) 6, 6a, 6b Film (heat-resistant synthetic resin) 7 Paper material 8, 9 Seal part (paper material upper and lower edge) 10, 20 sewing machine Eye

Claims (5)

[Claims] 1. A self-supporting structure comprising front and rear walls and a bottom made of a heat-resistant synthetic resin film, the front and rear walls being joined at both side edges, and the bottom being folded between both walls and joined at both side edges. A cooking bag for a microwave oven, wherein at least one of the front and rear wall portions has a paper material having a folding and holding property at an upper portion of the bag except for an upper end portion. 2. A wall portion having a paper material, wherein a tape-shaped paper material reaching both side edges of the wall portion is disposed inside a synthetic resin film, and the paper material is joined to the synthetic resin film at upper and lower edges thereof. And a linear perforation reaching the both side edges of the wall portion is formed in the synthetic resin film at a position between the upper and lower joints of the portion overlapping with the paper material. The cooking bag for a microwave oven as described in the above. 3. The cooking bag for a microwave oven according to claim 2, wherein perforations are formed on the paper material at the same positions as perforations formed on the synthetic resin film. 4. The cooking bag for a microwave oven according to claim 1, wherein the wall portion having the paper material is formed by joining two synthetic resin films at an interval above and below a tape-shaped paper material. 5. The cooking bag for a microwave oven according to claim 3, wherein the tape-shaped paper material has a linear perforation reaching both side edges of a wall portion at a position sandwiched between joints with the upper and lower synthetic resin films. .