JPH1120805A - Packaging body and packaging bag for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging body and a packaging bag for a microwave oven at a low cost without lowering the commodity value through the sterilization by efficiently discharging the generated steam while preventing the leakage of the food to be cooked when heated in the microwave oven. SOLUTION: In a packaging body for a microwave oven in which the food to the cooked is stored in a storage part 30 of a bag body 1 formed of a packaging sheet 3, inner sides of a pair of lapped packaging sheets 3 are adhered to each other at an adhesion part 36 to form a back-attached part 7. The back- attached part 7 is folded so that one of the packaging sheet 3 which is multi- layered out of an outer film and an inner film is an upper surface 7a, and the packaging sheet 3 has a peeling part 20 where the outer film is non-adhered or wealky-adhered to the inner film. The peeling part 20 is provided up to he position corresponding to the storage part 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for a microwave oven which enables cooking of cooked items such as Chinese cooking utensils and curries in a microwave oven, and a microwave oven capable of packing these cooked items. It relates to a packaging bag for use.

[0002]

2. Description of the Related Art Conventionally, Chinese cooking utensils in a package,
A cooked product that generates steam during heating may be ruptured by internal pressure when a microwave oven is used. Therefore, a method using hot water heating is generally employed.

Therefore, when cooking in a microwave oven,
It is necessary to devise a way to release the vapor without leaking the liquid. Conventionally, a check valve is attached to the package, or a part of the package is cut with scissors immediately before cooking.

[0004]

However, when the check valve is employed as described above, there is a problem that the function is incomplete and the cost is high.
Not yet commonly used. In addition, there is a possibility that the liquid cooked product may be boiled and spilled.

[0005] As shown in FIG. 12, a back portion formed by bonding the inner surfaces of the ends of a pair of wrapped sheets 3 'to a bag portion 5' in which an article to be cooked is accommodated. It is also conceivable to provide a pasting portion 7 'and provide the back and pasting portion 7' with first and second passages 10 ', 11' formed without bonding the ends of the packaging sheet 3 '. In such a package, by heating and cooking after opening one end of the second passage 11 ′ by cutting or the like, the generated steam passes through the first passage 10 ′ and the second passage 11 ′ and The food is discharged from one end of the passage 11 'to the outside, so that the food can be easily cooked using a microwave oven.

[0006] However, in such a package, when a product to be cooked is sterilized by heating after packaging,
There is a risk that steam and even the food to be cooked may enter the first passage 10 'and the second passage 11', thereby deteriorating the beauty of the final product.

Therefore, the present invention has been made to solve such a problem, and efficiently discharges steam generated while preventing leakage of an article to be cooked during heating and cooking in a microwave oven, and performs a sterilization treatment. It is an object of the present invention to provide an inexpensive package for a microwave oven and a packaging bag for a microwave oven without lowering the commercial value of the product.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a package for a microwave oven according to the present invention is provided in a housing portion of a bag body 1 made of a packaging sheet 3. In a microwave oven package in which a product to be cooked is accommodated in 30, the inner surfaces of a pair of stacked packaging sheets 3 are adhered to each other by an adhesive portion 36 to form a back paste portion 7, and the back paste portion 7 is formed. 7, one of the multi-layered wrapping sheets 3 composed of the outer film 3a and the inner film 3b is folded so as to be the upper surface 7a, and the other wrapping sheet 3 has the outer film 3a and the inner film 3b not yet formed. It has a peeling section 20 in an adhesive or weakly adhesive state, and the peeling section 20
It is characterized by being provided up to a position corresponding to 30.

In the package for a microwave oven according to the present invention, when an object to be cooked is heated and cooked in a microwave oven, first, the pressure generated in the accommodating portion 30 is increased by steam generated from the object to be cooked, and the bag body 1 is opened. Deform (expand). And since the peeling part 20 provided to the position corresponding to the storage part 30 is isolated from the storage part 30 only by the inner film 3b, when the inside of the storage part 30 reaches a certain pressure or more by further heating and cooking, Bag body 1
Due to the deformation (expansion) force acting on the
Of the 20, the film 3b is broken. In particular, since the peeling portion 20 is provided on the packaging sheet 3 on the upper surface 7a side of the back bonding portion 7,
The inner film 3b of the wrapping sheet 3 on the upper surface 7a is pulled by the wrapping sheet 3 on the lower surface side of the back adhering portion 7, so that the inner film 3b is accurately broken. Then, the steam generated from the cooked product flows between the outer film 3a and the inner film 3b of the peeling portion 20 from the break opening of the broken inner film 3b, and separates the outer film 3a and the inner film 3b. While passing between the films 3a and 3b, it is accurately discharged to the outside.

On the other hand, the housing portion 30 of the bag body 1 has an inner film 3b.
The inner film 3b is not broken in a normal boiling or retort heat sterilization treatment,
No cooked product or steam enters the (between the inner film 3b and the outer film 3a).

Further, it is preferable that the bonding portion 36 of the back pasting portion 7 has a breaking bonding portion 40 for breaking the inner film 3b at a location corresponding to the peeling portion 20 during heating and cooking,
Thus, when the packaging sheets 3 of the storage section 30 are separated from each other due to the steam generated during the heating and the bag body 1 expands, the inner film 3b of the adhesive portion for breaking 40 is placed on the lower side of the packaging sheet.
3 and the inner film near the breaking adhesive portion 40
The breaking force is applied to 3b, and the inner film at the peeling section 20 is precisely
3b can be broken.

In particular, the peeling portion 20 has a steam passage portion 20a for discharging the steam flowing out from the break portion of the inner film 3b broken near the breaking adhesive portion 40 to the outside, and flows out from the break portion. It is preferable that a steam storage section 20b capable of forming a space in the vicinity of the breaking adhesive portion 40 by storing steam is provided. By employing this configuration, steam flows into the steam storage section 20b from the break opening of the broken inner film 3b, and the outer film 3a and the inner film 3b of the storage section 20b are separated from each other. Due to the separation of the films 3a, 3b of the storage section 20b, a force acts in the direction of separating the outer film 3a and the inner film 3b of the vapor passage section 20a, so that the breakage opening is closed by the vapor of the storage section 30. Can be prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, an embodiment of the present invention will be described. First, a packaging bag of the present embodiment in which articles to be cooked are packaged will be described with reference to the drawings. In addition, as to-be-cooked products, for example, various kinds of ingredients such as mapo tofu, ingredients for Chinese rice bowl, shrimp chili, meat dumpling, curry, oden with soup stock, yakisoba, rice, sauce pork simmered with sauce, sauce with sauce, stew, soup, etc. Foods.

In the bag body 1 for packaging the article to be cooked, a packaging sheet 3 composed of an outer film 3a and an inner film 3b having heat welding property is folded, as shown in FIGS. 1 and 2. A bag portion 5 having a substantially rectangular shape in a front view and having a periphery sealed by heat welding, and a back paste in which ends of the packaging sheet 3 are overlapped at the center of the bag portion 5 and sealed by heat welding at an adhesive portion 36. Unit 7.

The back adhering portion 7 is folded toward the bag portion 5 such that one of the pair of packaging sheets 3 becomes the upper surface 7a. Specifically, the back adhering part 7 is
After being heat-welded at 36, the bag is bent by the heat seal bar from the outer film 3a side of the upper surface 7a while being bent to the bag portion 5 side.
5 by heat sealing the periphery.
Is folded so as to be the upper surface 7a.

In this embodiment, the width W1 of the bag portion 5 and the back portion 7 is 130 mm, and the vertical length W of the bag portion 5 is 130 mm.
2 is 170 mm, and the vertical length W3 of the back bonding portion 7 is 3
0 mm.

In the drawing, reference numeral 30 denotes a housing portion in which the inner surfaces of the packaging sheet 3 are not bonded to each other. The housing portion 30 includes a bag-side housing portion 32 formed in the bag portion 5 and a bag-side housing portion. And a back-adhering portion-side housing portion 34 formed in the back-adhering portion 5 in communication with the back portion 32.
It is shut off from the outside by 36. Note that the bag-side housing portion 32 is configured to be able to store the article to be cooked, and the back-attached-portion-side housing section 34 is configured such that the packaging sheets 3 are separated from each other and spread by steam generated by the article to be cooked during heating and cooking. Become.

Further, the bonding portion 36 of the back bonding portion 7 is
As shown in (a), a concave portion (a portion not in contact with the packaging sheet 3) is provided at a position corresponding to the back-attached portion accommodating portion 34 and the like in order to form the back-attached portion accommodating portion 34 and a non-adhesive portion 50 described later. The inner surfaces of the packaging sheet 3 are formed by heat welding with a heat seal bar. Specifically, the shape of the edge portion of the bonding portion 36 with the back bonding portion accommodating portion 34 is one side (the right side of FIG. 2A).
From the free end 7b to the other side (left side).
Incline toward the free end 7b to the position of 1mm (W4),
The inclined portion is provided so as to be parallel to the free end 7b from the end portion to the substantially central portion, and
36a) is provided so as to have a protruding portion 40 that is 4 mm in width and continuously protrudes 7 mm toward the bag portion 5 side from the end of the protruding portion 40, and further has a free end 18 mm from the end 40a of the protruding portion 40. It is provided so as to face vertically toward 7b and to be inclined toward the bag portion 5 from the end of the vertical portion. Since the bonding portion 36 is formed in the shape as described above, the back-adhering-portion-side storage portion 34 is formed on one side (left side) of the storage portion 34A by the projecting portion 40.
And the other side (right side) accommodation portion 34B, and the left accommodation portion 34A is formed larger than the right accommodation portion 34B. In addition, when expanded by heating, the inner film 3b of the protruding portion 40 is formed so that a force easily acts on the inner film 3b, and the protruding portion 40 corresponds to the bonding portion 40 for breakage.

The non-adhesive portion 50 in which the inner surfaces of the wrapping sheet 3 are in a non-adhesive state as described above is located on the free end 7b side of the right housing portion 34B so that the periphery is surrounded by the adhesive portion 36. It is formed to the vicinity of the side edge toward the right side. Specifically, the non-adhesive portion 50 has a width of 7 mm (vertical direction) from the position 11 mm from the free end 7b to the bag portion 5 side, and 10 m from the position 4 mm from the left housing portion 34A to the right side edge.
It is provided up to the position of m.

In the drawing, reference numeral 20 denotes a peeling portion for making the outer film 3a and the inner film 3b of the packaging sheet 3 on the upper surface 7a side of the back pasting portion 7 weakly adhered. The peeling section 20 has a first peeling section 22 provided in a substantially rectangular shape from the center of the bag section 5 toward the free end 7b of the back adhering section 7, and a free end extending from the first peeling section 22.
It comprises a second peeling portion 23 provided narrower than the first peeling portion 22 over 7b, and a third peeling portion 24 provided rightward from the first peeling portion 22.

Here, the first peeling portion 22 has a width of 36 mm.
In (W5), the left edge is 11 mm from the adhesive portion for break 40.
It is located on the left side and the right edge is 21
mm to the right. The first peeling portion 22 is provided such that the end 22a on the bag portion 5 side is located 6 mm closer to the bag portion 5 than the end portion 40a of the adhesive portion 40 for breakage. As described above, the bonding portion for breakage 40 is formed at a position corresponding to the first peeling portion 22, and is attached to the inner film 3b of the bonding portion for breakage 40 when the bag body 1 is expanded by heating and cooking. The inner film 3b near the breaking adhesive portion 40 is broken by the acting force. still,
The portion of the first peeling portion 22 closer to the bag portion 5 than the breaking adhesive portion 40 is configured to be able to store the steam flowing out from the break opening of the inner film 3b broken near the breaking bonding portion 40. Such a portion corresponds to the steam storage section 20b according to the second aspect.

The second peeling portion 23 has a width of 12 mm at the center of the back pasting portion 7 and is continuous with the first peeling portion 22.
Up to the free end 7b, and the third peeling portion 24
Is formed continuously to the first peeling portion 22 up to the side edge portion on the back side of the back adhering portion 7. As described above, the second peeling portion 23 and the third peeling portion 24 are formed up to the edge of the back adhering portion 7, and allow the steam flowing out from the opening of the inner film 3 b broken near the breaking adhesive portion 40 to flow to the outside. The second and third peeling portions 23, 24 and a portion of the first peeling portion 22 closer to the free end 7b than the breakable adhesive portion 40, according to claim 2, It corresponds to the steam passage section 20a.

Further, the third peeling section 24 is located at a distance of 10 from the free end 7b.
It is formed to the right with a width of 9 mm (vertical direction) from the position of mm. That is, the third peeling portion 24 is provided at a position corresponding to the non-adhesive portion 50, and has a slightly larger vertical width than the non-adhesive portion 50. As described above, the non-adhesive portion 50 is not formed up to the side edge of the back adhering portion 7, but the third peeling portion 24 is formed up to the side edge.

The outer film 3a of the packaging sheet 3 is made of a thermoplastic resin film. Specifically, in this embodiment, a biaxially stretched nylon film having a thickness of 15 μm is used. As the outer film 3a, a heat-resistant film such as biaxially-stretched polyethylene terephthalate, biaxially-stretched polypropylene, or cellophane can also be used.Also, a vapor-deposited film, various coated films, or a multilayer film obtained by laminating these films can be used. Can be adopted.
In this embodiment, a 30 μm thick film made of linear low-density polyethylene is used as the inner film 3b. The inner film 3b is made of low-density polyethylene, medium-density polyethylene, high-density polyethylene, ultra-low-density polyethylene, unstretched polypropylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / ethyl acrylate copolymer. A heat-welding film such as a coalesced film, an ethylene / methacrylic acid copolymer, an ethylene / methyl acrylate copolymer, or an ionomer can be used.

The packaging bag of the present embodiment has the above-described configuration. Next, a method for producing the packaging bag will be described. The packaging sheet 3 composed of the outer film 3a and the inner film 3b is
First, after a release agent is printed on the inner surface of the outer film 3a with a thickness of 0.1 to 5 μ by a gravure printing machine, a urethane-based adhesive is applied by a dry laminating machine, and the inner film 3b is adhered to this. ,It is formed. Note that the portion where the release agent is applied is formed as the release portion 20. When bonding the outer film 3a and the inner film 3b, various methods other than those described above can be adopted. As the release agent, a polyamide / nitrified cotton type, acrylic / polyethylene, cyclized rubber, chlorinated polyolefin type, or the like can be used. What is necessary is just to employ | adopt what eliminates or weakens the adhesive force of the laminating adhesives, such as the said urethane type adhesive, and a film.

The packaging sheet 3 on which the outer film 3a and the inner film 3b are laminated and adhered as described above is cut into a predetermined width and wound up, and then a release agent for the back adhering portion 7 is applied as shown in FIG. The folded packaging film 3 is folded so as to be the upper surface 7a, and the inner films 3b at the overlapped ends are heat-welded by a heat seal bar having the shape of the adhesive portion 36, so that the back adhering portion 7 is It is formed. And the back stuck part
7 is folded toward the bag portion 5 with the packaging sheet 3 on which the peeling portion 20 is formed as the upper surface 7a, and the peripheral portion of the bag portion 5 is heat-sealed, and the bag is sealed and formed as a whole to form a bag. .
As a result, the one sheet 3 having the peeling portion 20 is
The back sticking portion 7 is given a folding habit so that It is to be noted that such a bag-making can be performed simultaneously with or before and after the formation of the back stuck portion 7, but it is preferable to separately perform a method for imparting a folding habit to the back stuck portion 7.

It is to be noted that the article to be cooked can be filled at the same time as the above-mentioned bag-making to obtain a package filled with the article to be cooked. A packaging bag having a cut-out opening after bonding is formed, and the article to be cooked is filled using the opening as a filling port. Then, the filling port is adhered and closed, and the package body containing the article to be cooked is packed. It is also possible to get

In this way, as shown in FIG. 3A, the package for the microwave oven according to the present embodiment in which the article to be cooked is accommodated is obtained. This package is used by the following method.

When the food to be cooked in the package is heated and cooked in a microwave oven, first, the steam generated from the food to be cooked causes the container to be heated.
The pressure inside 30 increases, and the entire bag expands as shown in FIG. 3 (b) and has a round shape as a whole.
34 is also filled.

Further, when the pressure inside the accommodating portion 30 reaches a predetermined pressure or more due to the internal steam, the breaking adhesive portion 40 is bonded to the inner films 3b. As shown in FIG. 4 (b), the peeling portion 20 easily acts on the inner film 3b at the end portion 40a of the portion 40, and the unbonded space between the inner films 3b of the housing portion 30 (the back side portion side housing portion). 34) and only through the inner film 3b.
The inner film 3b in the vicinity is pulled by the inner film 3b on the lower surface, and is broken as shown in FIG. In particular, since the peeling portion 20 is provided on the sheet 3 on the upper surface 7a side of the back adhering portion 7, the force for deforming the bag body 1 as described above is
Exactly acts on the inner film 3b of the peeling part 20, and
3b will be accurately broken. Further, the back-adhering portion-side accommodating portion 34 is formed in a tapered shape from the bag portion-side accommodating portion 32 to the upper side.
A is provided up to the vicinity of the free end 7b.
When the steam flows into 34A, the swelling force of the bag body 1 easily acts on the inner film 3b of the breaking adhesive portion 40.

The steam flows out of the broken portion of the inner film 3b thus broken. The steam that has flowed out from the break opening flows into the steam passage portion 20a, passes through the passage portion 20a while separating the outer film 3a and the inner film 3b of the passage portion 20a, and is discharged to the outside. . In addition, the steam flowing out of the breaking hole also flows into the steam storing portion 20b, and separates the outer film 3a and the inner film 3b of the storing portion 20b. Due to the separation between the films 3a, 3b in the storage section 20b, the outer film 3a and the inner film 3b
A force acts in a direction to separate the breaker from the opening, thereby preventing the breakage opening from being blocked by the vapor of the storage unit 30. In particular, since the peeling portion 20 (first peeling portion 22) is provided so that the left and right edges have a predetermined interval from the bonding portion for break 40, the unbroken inner film 3b on both sides of the break opening is formed. Is connected continuously from the storage section 20b to the passage section 20a.
By expanding 20b, the outer film 3a and the inner film of the passage portion 20a can be separated from each other.

Further, since a non-adhesion portion 50 where the inner films 3b are not adhered to each other is formed at a position corresponding to the third peeling portion 24 serving as the vapor passage portion 20a, the inner film 3b is easily bent, The outer film 3a and the inner film 3b are separated from each other, so that the steam passage is reliably formed. That is,
When a sealing pressure for bonding the inner films 3b to each other is applied to the third peeling portion 24 through which the vapor passes, the releasing agent is applied but the inner film 3b and the outer film 3b are formed by the sealing pressure.
3a becomes a pseudo-adhesion state (slightly adhered state), and it becomes slightly difficult to pass steam. Moreover, when the inner film 3b at the portion where the steam passage is formed is adhered to the other inner film 3b, the inner film 3b is less likely to bend than when it is not adhered. Therefore, the separation section 20 where the passage of steam is scheduled
By forming the non-adhesive portion 50 at the same location as above, a vapor passage is easily formed.

Incidentally, of the portion which becomes the vapor passage portion 20a, the portion corresponding to the bonding portion 36 provided around the non-bonding portion 50 and the second peeling portion 23, the inner film 3b and the outer film
Although 3a is in a quasi-adhered state, since the steam flowing into the steam storage section 20b generates a force for separating the films 3a and 3b from each other, the problems described above are few.

Further, even if the cooked product may be boiled at the time of heating and cooking, since the second peeling portion 23 and the third peeling portion 24 are provided narrower than the first peeling portion 22, steam is generated. There is little possibility that the cooked product leaks from the discharged portion, and the inside of the microwave oven is hardly contaminated.

On the other hand, unlike the case of the above-mentioned heating and cooking, when the product to be cooked is subjected to ordinary boiling or retort heat sterilization before selling the product, the inner film 3b does not break,
Steam does not enter between the inner film 3b and the outer film 3a.

Moreover, since the pressure at which the inner film 3b breaks is determined by the material and the like of the inner film 3b, sterilization can be performed by appropriately changing the material and thickness of the inner film 3b or the type of the release agent. It has the advantage that it can be manufactured according to the pressure of processing and cooking.

An example of an experiment using the above-described package will be described.

<Experimental Example> The mabo tofu was put into the above-mentioned package and sealed, and the package was allowed to stand in a freezer at -20 ° C. all day and night, and was heated with a 500 W microwave oven. After heating, the entire bag began to expand at the time of 4 minutes and 30 seconds, and at the time of 4 minutes and 45 seconds, the inner film 3b was broken, the internal vapor was released, and the food became ready to eat at the time of 5 minutes and 20 seconds.

<Other Embodiments> Although the above embodiment has the above-described configuration, the present invention is not limited to this, and the design can be changed as appropriate within the intended scope of the present invention.

That is, in the above embodiment, the bonding portion 36
In a state in which the back bonding portion 7 formed by heat welding is bent toward the bag portion 5, the peripheral edge portion of the bag portion 5 is heat-sealed from the outer film 3a side of the upper surface 7a, so that one of the packaging sheets 3 is formed. Upper surface 7a
In the present invention, one sheet of the back affixing part 7 has been described.
The specific means for folding so that 3 becomes the upper surface 7a can be appropriately changed in design. For example, a method of heat-welding the inner films 3b of the back pasting portion 7 in a state of being bent to one side when forming the back pasting portion 7, or a back pasting portion in which a pair of packaging sheets 3 are already heat-sealed and formed. It is also possible to adopt a method in which the side 7 is pushed down to one side and pressed, or a method in which the free end 7b side of the back adhering portion 7 is adhered to the surface of the bag body 1.

In the above embodiment, the peeling section 20
Although the one having the second peeling portion 23 and the third peeling portion 24 has been described, the second peeling portion 23 does not have the second peeling portion 23 as in the above embodiment, but is formed over the side edge of the back pasting portion 7 as shown in FIG. Even if it has the third peeling portion 24, or has the second peeling portion 23 formed over the free end 7b of the back pasting portion 7 as shown in FIG. It is the intended range of the invention.

Further, without forming the peeling portion 20 up to the edge of the back adhering portion 7, a notch 26 is formed in one portion of the peeling portion 20 as shown in FIG.
Can be formed beforehand. In this manner, when the steam discharge portion is formed by the notch 26, the cutout is not limited to the U notch as shown in FIG. I can do it. Here, in the present invention, the shape of this type of notch,
The ease with which steam can escape can be changed by changing the size, direction, and the like, thereby making it possible to set the pressure during heating and cooking.

Further, in the above embodiment, the back adhering portion 7
Although the adhesive portion 36 of the had an adhesive portion 40 for breakage,
The present invention is not necessarily limited to this. Further, as in claim 2, a breakable adhesive portion for breaking the inner film 3b at a location corresponding to the peeling portion 20 during heating and cooking.
Even in the case where 40 is provided, the bonding is not limited to the one protruding from the end of the parallel portion (central edge 36a) as in the above-described embodiment, and as shown in FIG. It is also possible to configure the part 40. However, it is preferable that the adhesive portion for breaking 40 is protruded from the central edge 36a as in the above-described embodiment, so that the inner film 3b is more accurately broken by the expanding force of the housing portion 30. It should be noted that even when the breakable adhesive portion 40 is protruded in this manner, the breakable adhesive portion 40 can be protruded in a state of being separated from the center edge 36a as shown in FIG. In addition, as shown in FIG.
It is also possible to employ 40. In the package shown in FIG. 11, the adhesive portion 36 has a shape in which the shape on the bag portion 5 side becomes narrower toward the free end 7b side and has a projecting portion projecting from the central portion 36a in a square shape. One side of the protruding portion on the side of the bag portion 5 is formed as a breaking adhesive portion 40. Further, as shown in the above-described embodiment, both a breaking adhesive portion continuous with the center edge and a breaking adhesive portion separated as shown in FIG. 8 are provided, or a plurality of separated bonding adhesive portions separated as shown in FIG. It is also possible to provide a plurality of adhesive portions for breaking 40.

Further, in the above-described embodiment, the back sticking portion-side receiving portion 34 of the receiving portion 30 is described in which the receiving portion 34A on one side is formed larger than the receiving portion 34B on the other side. As shown in FIGS. 8 and 11, it is also possible to provide the back pasting portion accommodating portion 34 symmetrically in the front-rear direction. In addition, the back-adhered portion-side accommodation portion 34 is
It is preferable that the bag body 1 is formed to have a shape that becomes narrower toward the free end 7b side, so that the swelling force of the bag body 1 easily acts to break the inner film 3b of the breaking adhesive portion 40. .

In the above-described embodiment, the end 40 a of the breakable adhesive portion 40 on the bag portion 5 side is 6 mm from the end of the peeling portion 20.
mm, the one provided so as to be positioned on the free end 7b side has been described, but the present invention is not limited to this.

However, it is preferable that the breaking adhesive portion 40 is provided so as to be located at least 1 mm from the end of the peeling portion 20 on the free end 7b side of the back adhering portion 7, whereby the bag body
Due to the force acting on the breaking adhesive part 40 at the time of expansion of 1,
This has the advantage that the inner film 3b of the peeling section 20 is easily broken.

Further, the breaking adhesive portion 40 is formed of an inner film
It is preferable to form the space on the free end 7b side by a predetermined distance from the end of the peeling portion 20 so that a space is formed by storing the steam flowing out from the break opening of 3b. Thus, the steam storage section 20b for storing the steam flowing out from the break is provided, and the discharge of the steam can be ensured. In the package shown in FIGS. 5 to 8, a steam storage section 20b is formed together with the steam passage section 20a.

Further, in the above embodiment, the packaging sheet
3 has been described in which the back end portion 7 is formed by heat welding at the end portion. For example, as shown in FIG. 9, an intermediate portion of the packaging sheet 3 is double-folded, and the folded and overlapped portion A is formed. It is also possible to bond the inner films 3b to each other to form the back pasting portion 7. However, in the case of a package as shown in FIG. 9, a third peeling portion 24 as shown in FIG.
It is necessary to form notches 26 as shown in FIG. Note that FIG.
, The illustration of the inner film and the outer film of each sheet is omitted.

Further, in the above embodiment, the steam passage section
Since the non-adhesion portion 50 where the inner films 3b are not adhered to each other is formed at a portion corresponding to the portion (the third peeling portion 24) to be 20a, the above-described advantages are provided. It is not limited. Further, as shown in FIG.
Weak seal at the location corresponding to the steam passage section 20a
39 can also be formed, whereby the pseudo-bonding strength between the inner film 3b and the outer film 3a (slightly bonded bonding strength) in the weak seal portion 39 is weak, so that a steam passage is likely to be formed during heating and cooking. Has advantages. Note that the package as shown in FIG. 11 is formed by heat-sealing the weak seal portion 39 only once with a heat seal bar and heat-sealing the adhesive portion 36 a plurality of times, for example. Can be manufactured by heat-welding the inner surfaces of each other.

Further, in the present invention, one packaging sheet
3 is not limited to being formed by folding, and it is not essential to provide both packaging sheets 3 constituting the back pasting portion 7 in multiple layers, and the packaging sheet on the upper surface 7a side is not essential.
If 3 is composed of multiple layers, the design can be changed as appropriate. For example, as shown in FIG.
A first packaging sheet 3A serving as the lower surface of the bag 32; a second packaging sheet 3B forming the upper surface of the bag-side housing portion 32 and the lower surface of the back bonding portion 7; Top of 7
The third packaging sheet 3C forming the 7a side is included in the range intended by the present invention, even if the third packaging sheet 3C is composed of the outer film 3a and the inner film 3b in multiple layers.

Further, the packaging sheets 3 on the upper and lower surfaces of the back bonding portion 7
It is within the intended scope of the present invention that the peeling portion 20 is formed on both sides, but if the inner film 3b of the packaging sheet 3 on the lower surface side is broken, the outer film 3a and the inner film 3b of the peeling portion 20 become Since it is difficult to separate and it is difficult to discharge steam, it is preferable that the peeling portion 20 is formed only on the packaging sheet 3 on the upper surface 7a without forming the peeling portion 20 on the packaging sheet 3 on the lower surface side.

[0052]

In the package for a microwave oven according to the present invention, since the peeling portion is provided up to the position corresponding to the housing portion, the article to be cooked is heated and cooked in the microwave oven, and the pressure in the housing portion is kept constant. When the pressure exceeds the pressure, the inner film breaks, and the steam passes through the peeling portion between the inner film and the outer film, so that it is possible to easily cook the article to be cooked using a microwave oven. It has the effect of. In particular, since the back affixing portion is folded so that the packaging sheet having the peeling portion becomes the upper surface, the force for deforming the bag body properly acts on the inner film of the packaging sheet which becomes the upper surface. This has the effect that the inner film of the packaging sheet can be more accurately broken.

Further, in the package for microwave oven according to the present invention, the product to be cooked is placed in a portion through which steam passes during cooking even if the product to be cooked is subjected to normal boiling or retort heat sterilization before selling the product. Since there is no intrusion, it has the effect of not lowering the commercial value, and the pressure at which the inner film breaks can be set as appropriate depending on the material of the inner film, etc., and the inner film breaks carelessly during sterilization treatment This also has the effect of preventing such a situation.

[Brief description of the drawings]

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

FIG. 2 shows the packaging bag of the embodiment, (a) is a front view,
(B) is a right side view.

FIG. 3 is a cross-sectional side view of the microwave oven package according to the embodiment in use, (a) showing a sealed state, and (b) showing a state at the time of cooking.

FIG. 4 is an enlarged side view of a main part of the microwave oven package according to the embodiment in use, (a) showing a sealed state,
(B) shows a state at the time of cooking, and (c) shows a state in which the inner film is broken.

FIG. 5 is a front view of a packaging bag for a microwave oven according to another embodiment.

FIG. 6 is a front view of a packaging bag for a microwave oven according to another embodiment.

FIG. 7 is a front view of a packaging bag for a microwave oven according to another embodiment.

FIG. 8 is a front view of a packaging bag for a microwave oven according to another embodiment.

FIG. 9 is a side view of a packaging bag for a microwave oven according to another embodiment.

FIG. 10 is a side view of a packaging bag for a microwave oven according to another embodiment.

FIG. 11 is a front view of a packaging bag for a microwave oven according to another embodiment.

FIG. 12 is an explanatory view showing a conventional packaging bag for a microwave oven.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag main body, 3 ... Packaging sheet, 3a ... Outer film, 3b ... Inner film, 5 ... Bag part, 7 ... Back part, 7a ... One side, 20 ... Peeling part, 20a ... Steam passage part, 20b ... Steam storage Part, 22 ... first peeling part, 24 ... second peeling part, 26 ... notch, 30 ... accommodation part, 32 ...
Bag-side housing part, 34: back-adhered part-side housing part, 40: adhesive part for breaking, 50: non-adhesive part

Claims (3)

[Claims] 1. A bag body made from a packaging sheet (3).
In the microwave oven package in which the article to be cooked is accommodated in the accommodating portion (30) of (1), a pair of overlapping packaging sheets is provided.
The inner surfaces of (3) are adhered to each other with an adhesive portion (36) to form a back pasting portion (7), and the back pasting portion (7) is formed of a multilayer film composed of the outer film (3a) and the inner film (3b). One of the packaging sheets configured
(3) is folded so that it becomes the upper surface (7a), and one of the packaging sheets (3) is an outer film (3a) and an inner film (3b).
Has a peeled part (20) in an unbonded or weakly bonded state,
Moreover, the peeling part (20) is provided up to a position corresponding to the accommodation part (30). 2. A bonding portion (40) for breaking the inner film (3b) at a position corresponding to the peeling portion (20) during heating and cooking, wherein the bonding portion (36) of the back bonding portion (7) is provided. And the peeling part (20) is a steam passage part for discharging the steam flowing out from the break opening of the inner film (3b) broken near the breaking adhesive part (40) to the outside. (20a) and a steam storage part (20b) capable of storing steam flowing out from the break opening to form a space near the bonding part for break (40).
The package for a microwave oven as described in the above. 3. A bag body made from a packaging sheet (3).
In the packaging bag for a microwave oven, which is provided so as to be able to store the article to be cooked in the storage section (30) of (1), the inner surfaces of the pair of stacked packaging sheets (3) are adhered to each other by the adhesive section (36). A backing part (7) is formed, and the backing part (7) has an upper film (7a) on which one packaging sheet (3) composed of an outer film (3a) and an inner film (3b) is multilayered. ), And one of the packaging sheets (3) has a peeling portion (20) in which the outer film (3a) and the inner film (3b) are not bonded or weakly bonded, Moreover, the packaging bag for a microwave oven is characterized in that the peeling portion (20) is provided up to a position corresponding to the accommodation portion (30).