JP3012970B2 - Packaging bag for microwave cooked food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a food packaging bag which can be reliably cooked in a microwave oven, and can be reliably prevented from bursting due to an increase in internal pressure caused by steam generated from the food during cooking. The present invention relates to a packaging bag for microwave-cooked food, which is characterized in that it can be sufficiently steamed.

[0002]

2. Description of the Related Art In order to prevent this kind of packaging bag from exploding in a microwave oven, usually, a small hole is opened before cooking, and steam generated from food during heating cooking is discharged outside the packaging bag. It can be released.

As another means, for example, as disclosed in Japanese Patent Application Laid-Open No. HEI 8-119343, in a packaging bag made of a synthetic resin film, an inner space facing the bag inner space of the film is formed. For the film part,
Forming a heat-sealed portion in which the films are partially heat-sealed so that a tensile force acts with an increase in the internal pressure of the bag internal space, and the heat-sealing is performed by the tensile force due to the internal pressure. 2. Description of the Related Art There is known a packaging bag for a microwave cooked food, which is configured to be capable of being broken open at a peripheral portion of the portion or in the vicinity thereof.

[0004]

However, in the former case of the above-mentioned prior art, it is troublesome to open a small hole in the packaging bag every time heating cooking is performed, and if the step of opening the small hole is forgotten, the packaging bag will burst. There is a problem that brings.

In the case of the latter of the above prior arts, the former problem can be solved, but on the other hand, it is difficult to avoid that the degree of heat fusion of the heat fusion parts in each packaging bag becomes uneven. Therefore, even if the packaged food is the same, there is a problem that the steaming condition tends to cause unevenness, and both of them release the steam generated from the food at once, and cannot release it gradually, There is a problem that it is difficult to sufficiently cook food.

Further, in both cases, since the hole for vapor release is provided directly on the surface of the packaging bag, when the food contains a lot of liquid, a part of the liquid and the food leak out. There is a problem of soiling the inside of the microwave oven, and the film around the hole for vapor release is adsorbed on the surface of the food in the packaging bag which is in a reduced pressure state after the completion of the cooking, and the hole is substantially closed. However, since the inside of the packaging bag is cut off from the outside air, the reduced pressure in the packaging bag cannot be eliminated, and therefore, the food should be compressed by the packaging bag to lose its shape or be cooked and finished. There is an important problem that the food becomes sticky and the appearance and flavor are easily impaired.

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and has been developed in order to prevent the packaging bag from being ruptured due to an increase in internal pressure due to steam generated from food during cooking by heating in a microwave oven. Of course, it can be surely prevented, and the steam is gradually released, so that the food can be sufficiently cooked, and the cooking conditions for the same food can be easily kept uniform, and the cooking finish of the food is good. It is an object of the present invention to provide a packaging bag for cooking food prepared with a microwave oven having features.

[0008]

As a means for solving the above-mentioned problems and achieving the object, the present invention provides a microwave-cooked food made of a heat-adhesive plastic film having a closed edge other than a food accommodation opening. The packaging bag body, and in the vicinity of an arbitrary sealed edge of the packaging bag body, adhesively and internally provided on both inner surfaces of the packaging bag body for gradually discharging high-pressure steam generated in the packaging bag body to the outside. A heat-shrinkable tape made of a heat-adhesive plastic film, the heat-shrinkable tape has a property of weakly adhering to the inner surface of the packaging bag body by heating. The heat-shrinkable tape is heat-sealed over the entire length between the closed edges on both sides of the packaging bag body, and the packaging bag is Body Yes and upper and lower end portions cut notch of the upper and lower edges of the packaging bag body side of the formed of the notch
One notch near the outside of the steam release member
Provided on the periphery of the packaging bag body and packaged the other notch
It is intended to provide a packaging bag for food prepared by microwave oven, characterized in that the packaging bag is provided on the side edge of the bag body on the opening side .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. A packaging bag for cooking food for microwave oven according to the present invention is roughly divided into a packaging bag body 1 and this packaging bag. Packaging bag body 1 installed at a predetermined location in body 1
And a gradual release member 2 for gradually releasing high-pressure steam generated therein to the outside.

In the present embodiment, the packaging bag body 1 is formed by laminating two plastic films F, F having the same heat-adhesive properties, such as a polyethylene film having the same shape and the same size and a rectangular shape. In the state in which the vapor slow-release member 2 described later is interposed near the upper edge between the superimpositions, the upper edges a and the both edges b, b of the both plastic films F, F other than the lower edges. The food bag is provided with a food storage opening 3 at the lower side by heating and bonding, and the other three sides are hermetically sealed.
Notches 4a, 4a and 4b, 4b for cutting off the upper and lower edges of the packaging bag main body 1 are provided on both side edges b, b of the upper and lower ends.

In the present embodiment, the vapor sustained release member 2 is heated at a plurality of positions on one surface of a polyolefin heat-shrinkable tape T having heat-adhesive properties at substantially equal intervals. The packaging bag body 1 is provided with a printing layer 5 of a weak heating adhesive ink made of a gravure ink or a flexo ink having a property of weakly adhering to the surface of the plastic film F.

Next, at the time of manufacturing the packaging bag main body 1, the tape-shaped vapor-slow release member 2 constructed as described above is positioned in the vicinity of the lower side of the notch 4a on the upper side a of the packaging bag body 1 so that both plastic films are formed. F, F, and the two side edges are aligned with the both side edges b, b of the packaging bag body 1 and overlapped. In this state, the heat bonding of the both side edges b, b of the plastic films F, F is performed. At the same time, both side edges are simultaneously heated and adhered to be mounted in the packaging bag main body 1, and thereafter, the packaging bag main body 1 is placed at a substantially middle position in the vertical direction of the tape-shaped vapor slow-release material 2. The heat bonding process is performed over the entire length between both side edges b, b to form a heat-bonded portion 6 having a required width.

The adhesive strength of the vapor-slow release member 2 to the packaging bag body 1 in the heating adhesive portion 6 formed as described above is lighter in the printing layer 5 portion of the weak heating adhesive ink than in other portions. It is weakly adhered to the inner surface of the plastic film F of the packaging bag body 1.

Next, the operating state of the packaging bag for microwave-cooked food according to the embodiment configured as described above will be described.
A description will be given together with the effects. First, as shown in FIG. 1, a required cooked food M is stored from the food storage opening 3 of the packaging bag main body 1, and then, as shown in FIG. Food M is sealed in. Usually, in this state, it is transported as packaged food for microwave cooking and sold at stores.

When the above-mentioned packaged food is cooked in a microwave oven, as shown in FIG. 4, the notches 4a, 4a provided on both side edges b, b of the upper end portion of the package bag main body 1 start with the package bag. The upper edge a of the main body 1 is cut off and housed in a microwave oven (not shown). At this time, since the entire periphery of the packaging bag is adhered, the sealed state is maintained.

Next, when the switch of the microwave oven is turned on, as the time elapses, the steam generated from the heated food M increases the air pressure inside the packaging bag, so that each peripheral bonding portion of the packaging bag is placed inside. At this time, since the steam slow-release member 2 provided in the packaging bag is constituted by the heat-shrinkable tape T, the tape T is changed from the state shown in FIG. 5 to the state shown in FIG. The printing layer 5 of the weakly heat-adhesive ink is peeled off from the inner surface of the plastic film F adhered by the contracting action to form a slit-shaped opening S, and the slit-shaped opening S is formed. S releases high-pressure steam ST to the outside.

The above-mentioned slit-shaped opening S is not formed instantaneously, but is formed over time as the shrinkage speed of the heat-shrinkable tape advances and the internal pressure of the packaging bag increases. The release of the steam ST is also performed gradually, and then the slit-shaped opening S
The state of formation will be described with reference to FIGS.

That is, before the opening state shown in FIG. 7, the food M has already been considerably cooked. However, when the shrinkage action of the heat-shrinkable tape T and the rise in the internal pressure of the packaging bag progress, the weak heating adhesiveness is obtained. The bonding portion of the ink printing layer 5 is gradually opened from the near side, and when the opening state shown in FIG. 7 is reached, the steam ST in the packaging bag is gradually released to the outside.

Further, when the opening advances and reaches the opening state shown in FIG. 8, the steam ST in the packaging bag is actively discharged to the outside, and finally, as shown in FIG. 9, the opening is almost completely opened. By this time, the food in the packaging bag is sufficiently cooked by heating, but when this time is reached, the inside of the packaging bag is in communication with the outside air, and the outside air A enters the packaging bag. The inside of the packaging bag will not be decompressed later, and the inner surface of the packaging bag can be reliably prevented from sticking to the food M.
Does not collapse or the food that should be finished with the residual steam in the packaging bag does not become sticky, and the appearance and flavor of the sufficiently steamed food can be significantly improved. Can cut out the lower edge c of the packaging bag main body 1 from the notches 4b and 4b provided on both side edges of the lower end portion of the packaging bag main body 1 and open it, so that the food M can be easily taken out. You can do it.

Although the main embodiments of the present invention have been described above, the present invention is not limited to these embodiments, but can achieve the object of the invention and do not depart from the gist of the invention. Various design changes are possible within.

[0021]

According to the present invention, there is provided a packaging bag for microwave-cooked food made of a heat-adhesive plastic film in which the edges other than the food accommodating opening are sealed, and the vicinity of an arbitrary sealed edge of the packaging bag body. A gradual release member for gradually releasing high-pressure steam generated in the wrapping bag body to the outside, which is adhered to both inner surfaces of the wrapping bag body. At least one portion of the surface of the heat-shrinkable tape made of an adhesive plastic film is provided with a printing layer of a weakly heat-adhesive ink having a property of weakly adhering to the inner surface of the packaging bag body by heating. with heat sealing heat shrinkable tape over the entire length between opposite sides of the sealing edge of the packaging bag body, the cutting notches in upper and lower edges of the packaging bag body provided on the side edges of the upper and lower end portions of the packaging bag body Yes, one of Roh of the notch
Of the packaging bag body near the outside of the steam
At the edge, open the other notch at the opening of the packaging bag body.
The present invention relates to a packaging bag for cooking food for microwave ovens characterized by being provided on the side edge of the unit and used as described above, and has the following excellent effects.

(1) Since the steam generated from the food is gradually and gradually released without being released from the packaging bag to the outside at one time, the food can be sufficiently cooked.

(2) Since the slit opening for discharging steam is formed so as to open at a position not in direct contact with the food in the packaging bag, the plastic film around the opening may adhere to the food. Even after the completion of the cooking, the steam in the packaging bag is released and the outside air freely enters the packaging bag, so that the inside of the packaging bag can be reliably prevented from being in a decompressed state. The inner surface is in close contact with the food and the food is not deformed, and the remaining steam in the packaging bag does not cause the food that should be finished to be viscous to become sticky, so that the food can have good appearance and flavor.

(3) The position where the slit-shaped opening for releasing steam is formed is a place where the food in the packaging bag does not come into direct contact with the food in the packaging bag due to the structure of the slow-release steam member. It does not pollute the inside of the range.

(4) The cooking time of food can be easily adjusted by adjusting the length of the heated adhesive width of the steam slow-release member provided in the packaging bag body to a short length.

(5) After heating and cooking, the packaging bag body
From the notch provided on the side of the lower end to the bottom of the packaging bag body
By cutting off the side edges and opening, food can be easily taken.
Can be put out.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a partially omitted enlarged sectional view taken along line AA of FIG. 1;

FIG. 3 is a front view of a state in which food is stored and sealed in a packaging bag.

FIG. 4 is a front view of the packaging bag shown in FIG. 3 in a state where an upper edge is cut off.

FIG. 5 is an enlarged cross-sectional view showing a state in which a printing layer of a weakly heated adhesive ink is adhered to a packaging bag in a vapor slow-release member.

FIG. 6 is an enlarged cross-sectional view showing a state in which a heat-shrinkable tape shrinks by heating to form a slit-shaped opening in a print layer portion.

FIG. 7 is an explanatory diagram of a state where a small slit-shaped opening is formed by heating.

FIG. 8 is an explanatory diagram of a state in which a large slit-shaped opening is formed as heating proceeds.

FIG. 9 is an explanatory view showing a state in which a larger slit-shaped opening is formed by further progress of heating, and outside air is flowing into the packaging bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag main body 2 Vapor-slow release member 3 Food accommodation opening 4a Notch 4b Notch F Heat-adhesive plastic film T Heat-shrinkable tape 5 Printing layer of weak heat-adhesive ink 6 Heat-adhesive part a Upper edge b Both edges c Lower edge M Food S Slit opening ST Steam A Outside air

Claims (3)

(57) [Claims] 1. A packaging bag body for cooking microwave-cooked food made of a heat-adhesive plastic film having a sealed edge other than the food storage opening, and a packaging bag body near an arbitrary sealed edge of the packaging bag body. And a gradual release member for gradually releasing high-pressure vapor generated in the packaging bag body to the outside, which is adhered to both inner surfaces of the plastic bag. At least one portion of the surface of the heat-shrinkable tape comprising a printing layer of a weak heat adhesive ink having a property of weakly adhering to the inner surface of the packaging bag body by heating,
The heat-shrinkable tape is heat-sealed over the entire length between the sealed edges on both sides of the packaging bag body, and cut-away notches at the upper and lower edges of the packaging bag body are provided on the upper and lower ends of the packaging bag body.
Is provided, and one of the notches is
Provided on the periphery of the packaging bag body near the outside of the discharge member
At the same time, attach the other notch to the edge of the
A packaging bag for microwave cooked food, wherein the packaging bag is provided and configured. 2. The packaging bag for a microwave-cooked food according to claim 1, wherein the weakly heat-adhesive ink is a gravure ink. 3. The packaging bag for a microwave-cooked food according to claim 1, wherein the weakly heat-adhesive ink is an ink for flexo.