JP4215332B2 - Packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging bag for storing a food to be cooked in a microwave oven or an edible liquid.
[0002]
[Prior art]
When cooking food stored in a sealed packaging bag with a microwave oven, a part of the bag is cut with scissors to prevent the packaging bag from bursting due to high internal pressure due to cooking. It is necessary to keep it open.
[0003]
[Problems to be solved by the invention]
However, conventionally, it has been necessary to prepare a tool such as a bag to open a part of the bag, which is troublesome.
The present invention solves such a problem, and it is not necessary to prepare a tool such as a bag to open a part of the bag. The object is to allow a part of the bag to be easily opened.
[0004]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a packaging bag made of a synthetic resin film for containing a food or edible liquid material in a sealed state, and a layer constituting the inner surface is formed on the inner surface. It is made of a material made of a resin having a lower melting point than that of the layer located outside the layer forming the gas, forming a gas vent part in a part of the bag, and this gas vent part forms a cut part in the packaging bag material In addition, the material constituting the packaging bag is heated at a temperature that does not melt the layer that forms the inner surface from the inner surface side but melts the layer that forms the inner surface within the range including the cut portion. In addition, only the cut portion of the layer constituting the inner surface is closed by melting to the extent that it opens due to the increase in the internal pressure of the packaging bag during cooking in a microwave oven, and a plurality of the gas vent portions are provided. The gist It is intended to. The gist of the present invention is that a plurality of gas vents are formed in both the film constituting one side of the packaging bag and the film constituting the other side. Furthermore, the present invention uses a biaxially stretched film or a uniaxially stretched film as a layer located outside the layer that constitutes the inner surface of the packaging bag material, and the vicinity of the cut portion that is pushed open by the increase in the internal pressure of the packaging bag. The gist of the invention is that it is configured so as to tear a part of the material of the packaging bag.
[0005]
With this configuration, when cooking food or edible liquid contained in a sealed packaging bag with a microwave oven, the cut portion of the layer constituting the inner surface side of the degassing portion is increased by increasing the internal pressure of the packaging bag. Therefore, it is not necessary to cut and open a part of the bag by using a tool such as a bag as in the prior art. In particular, by providing a plurality of gas venting portions, even if all the gas venting portions do not open at the same time, it is possible to vent the inside of the packaging bag by opening at least one gas venting portion. The certainty of degassing can be increased. In addition, by forming a gas vent on each of the film constituting one side and the film constituting the other side, either the film constituting one side or the film constituting the other side is turned upward. It may be set in the microwave oven so that there is no direction when the packaging bag is set in the microwave oven, and handling becomes convenient. Further, when a biaxially stretched film or a uniaxially stretched film is used as the packaging bag material, the direction of tearing a part of the packaging bag material by pinching the vicinity of the cut-in portion pushed open by the increase in the internal pressure of the packaging bag. When the force is applied to the bag, the packaging bag is greatly opened, and a takeout port for food or the like can be formed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 6 will be described. Reference numeral 1 denotes a layer 2 constituting the inner surface side made of a resin having a melting point lower than that of the layer 3 constituting the outer surface side. 3 is a four-layer sealed packaging material for storing food or an edible liquid material in a sealed state. The one side of the packaging bag 1 is A degassing comprising a film 4 constituting the film and a film 5 constituting the other side, and opening in part of the film 4 constituting the one side due to an increase in the internal pressure of the packaging bag 1 during cooking in a microwave oven Part 6 is formed. In the embodiment shown in the drawings, three gas vents 6 are formed side by side in the vicinity of one side of the film 4 constituting one side of the packaging bag 1. In the vicinity of one side 7, the film material of the two-layer structure of the layer 2 constituting the inner surface side and the layer 3 constituting the outer surface side is formed in an arc shape and the side where the unconnected portion of the arc faces the one side A film having a two-layer structure in which three notches 9 are formed so as to face the 8 side, and the layer 2 constituting the inner surface side and the layer 3 constituting the outer surface side within a range including the notches 9. The material is sandwiched from both the front and back sides with heating plates 10a and 10b, the layer 2 constituting the inner surface side is melted, but the film material having a two-layer structure is heated at a temperature at which the layer 3 constituting the outer surface side is not melted, Only the notches 9 of the layer 2 constituting the inner surface side are closed by melting, and the gas Out portion 6 is formed. Thus, the cut portion 9 of the layer 2 constituting the inner surface side is closed by melting, but the strength of the portion is such that it opens due to an increase in the internal pressure of the packaging bag 1 during cooking in the microwave oven. .
[0007]
More specifically, in the packaging bag 1, the layer 2 constituting the inner surface side is made of polyolefin, and the layer 3 constituting the outer surface side is blended with nylon (NY-6) and modified nylon (MXD-6). Made of biaxially stretched film (Uniathlon, registered trademark, manufactured by Idemitsu Petrochemical Co., Ltd.) that can be linearly cut by applying force in the direction of tearing in the longitudinal direction by stretching the longitudinal axis strongly against the axis Yes. In this way, the synthetic resin film material having the structure in which the layer 3 constituting the outer surface side made of the biaxially stretched film and the layer 2 constituting the inner surface side made of polyolefin are laminated is formed on the inner surface side by the tearing force of the layer 3 constituting the outer surface side. The layer 2 that constitutes is also torn to follow. In addition, the packaging bag 1 was created by making the vertical axis of the biaxially stretched film perpendicular to the side edges 7 and 8 of the packaging bag 1.
[0008]
Therefore, when the food is cooked in the microwave oven in the state of being accommodated in the packaging bag 1 having such a configuration, the packaging bag 1 is formed with the film 4 constituting one side of the packaging bag 1 facing upward. Is set in the microwave oven and the small piece 11 surrounded by the cut portion 9 of the layer 2 constituting the inner surface side of the degassing portion 6 is pushed open from the inside by the increase of the internal pressure of the packaging bag 1. The gas vent 6 can be easily opened. In addition, by providing a plurality of gas venting portions 6, even if all the gas venting portions 6 do not open at the same time, at least one gas venting portion 6 is opened to vent the inside of the packaging bag 1. Therefore, the certainty of degassing can be improved. The embodiment shown in FIGS. 5 and 6 shows a state in which all the gas vents 6 are opened.
[0009]
In the present embodiment, as described above, a synthetic resin film material having a structure in which the layer 3 constituting the outer surface side made of the biaxially stretched film and the layer 2 constituting the inner surface side made of the polyolefin are laminated is a biaxially stretched film. The packaging bag 1 is made with the vertical axis of the packaging bag 1 oriented at right angles to the side edges 7 and 8 of the packaging bag 1, so that one small piece 11 pushed open by the increase in the internal pressure of the packaging bag 1 is By pinching and applying a force in the direction of tearing toward the side 8, the packaging bag 1 is greatly opened between the sides 7 and 8, and a food outlet 12 is formed (see FIG. 6). .
[0010]
In the present embodiment, a biaxially stretched film is used to tear the packaging bag 1, but the same effect can be obtained even when a uniaxially stretched film (high density polyethylene) is used. Further, as a material constituting the packaging bag 1, another layer made of a resin having a melting point higher than that of the layer 2 constituting the inner surface side is provided outside the layer 3 constituting the outer surface side, or the outer surface side is constituted. It is also possible to use another layer made of a resin having a melting point higher than that of the layer 2 constituting the inner surface side between the layer 3 and the layer 2 constituting the inner surface side. Of course, a cut portion as a degassing portion is also formed in this other layer.
[0011]
Next, the second embodiment shown in FIG. 7 will be described. In the first embodiment, the shape of the cut portion 9 of each gas vent 6 is an arc shape, but as shown in FIG. The notch 9 may be I-shaped. Other configurations are the same as those of the first embodiment. By forming the notch 9 into an I shape, when the food is cooked in the microwave while being stored in the packaging bag 1, the inner surface side of the gas vent 6 is configured by the increase in the internal pressure of the packaging bag 1. The small piece 11 surrounded by the cut portion 9 of the layer 2 to be pressed is pushed open from the inside as in the first embodiment, and the gas vent portion 6 can be easily opened. In addition to the first and second embodiments, the shape of the cut portion 9 may be a shape / shape as in the third embodiment shown in FIG. 8, or the fourth embodiment shown in FIG. The shape may be the same as in the embodiment, may be a + shape as in the fifth embodiment shown in FIG. 10, and may be a triangle, a square, or the like not shown in the drawings. good.
[0012]
Further, in the first and second embodiments, the gas vent 6 is formed on the film 4 constituting one side, but both the film 4 constituting one side and the film 5 constituting the other side. It is good to form the gas vent part 6 in. Other configurations are the same as those in any of the first to fifth embodiments. By doing in this way, either the film 4 constituting one side or the film 5 constituting the other side may be set in the microwave oven so that any film facing upwards Only the incision formed in the film is greatly expanded due to the internal pressure that rises by cooking and the degassing is performed by opening the film, and the incision formed in any of the films facing downward has a film facing downward Since it does not swell greatly due to the internal pressure rising by cooking, it does not open. Therefore, there is no directionality when the packaging bag 1 is set in the microwave oven, and handling becomes convenient.
[0013]
The shape of the packaging bag 1 is not limited to the embodiment shown in the drawings, and may be determined as appropriate according to the type of contents such as food or edible liquid.
[0014]
【The invention's effect】
As described above, according to the present invention, when food or edible liquid contained in a sealed packaging bag is cooked in a microwave oven, the inner surface side of the gas venting portion is configured by increasing the internal pressure of the packaging bag. The cut portion of the layer is pushed open from the inside, and the degassing portion can be easily opened, and it is not necessary to cut and open a part of the bag using a tool such as a bag as in the prior art. In particular, by providing a plurality of gas venting portions, even if all the gas venting portions do not open at the same time, it is possible to vent the inside of the packaging bag by opening at least one gas venting portion. The certainty of degassing can be increased. In addition, by forming a gas vent on each of the film constituting one side and the film constituting the other side, either the film constituting one side or the film constituting the other side is turned upward. It may be set in the microwave oven so that there is no direction when the packaging bag is set in the microwave oven, and handling becomes convenient. Further, when a biaxially stretched film or a uniaxially stretched film is used as the packaging bag material, the direction of tearing a part of the packaging bag material by pinching the vicinity of the cut-in portion pushed open by the increase in the internal pressure of the packaging bag. When the force is applied to the bag, the packaging bag is greatly opened, and a takeout port for food or the like can be formed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a packaging bag according to a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part showing a state in which a cut portion is formed in the packaging bag material.
FIG. 3 is an enlarged cross-sectional view of a main part showing a state in which a cut portion of the packaging bag is heated with a hot platen.
FIG. 4 is an enlarged cross-sectional view of a main part of a gas vent portion of the packaging bag.
FIG. 5 is an enlarged perspective view of a main part of the packaging bag showing a state in which all the gas venting parts are opened due to an increase in internal pressure of the packaging bag.
FIG. 6 is a perspective view of the packaging bag showing a state in which the packaging bag is torn from the opened gas vent.
FIG. 7 is a perspective view of a packaging bag according to a second embodiment of the present invention.
FIG. 8 is a plan view of a packaging bag according to a third embodiment of the present invention.
FIG. 9 is a plan view of a packaging bag according to a fourth embodiment of the present invention.
FIG. 10 is a plan view of a packaging bag according to a fifth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Layer which comprises inner surface side 3 Layer which comprises outer surface side Film 5 which comprises one side Film 6 which comprises the other side Gas venting part 7 Side 8 Side 9 Notch 11 Small piece

Claims (3)

A packaging bag made of a synthetic resin film for containing a food or edible liquid material in a sealed state, wherein the layer constituting the inner surface is located outside the layer constituting the inner surface Is made of a material made of a low melting point resin, and a degassing part is formed in a part of the bag. The material constituting the bag is heated at a temperature at which the layer constituting the inner surface from at least the inner surface side melts but the layer located outside the inner layer is not melted, and only the cut portion of the layer constituting the inner surface The packaging bag is formed by being closed by melting to the extent that it is opened by an increase in the internal pressure of the packaging bag during cooking in a microwave oven, and is provided with a plurality of the venting portions. 2. The packaging bag according to claim 1, wherein a plurality of degassing portions are formed on both the film constituting one side of the packaging bag and the film constituting the other side. Using a biaxially stretched film or a uniaxially stretched film as a layer located outside the layer constituting the inner surface of the packaging bag material, the packaging bag is picked up by the vicinity of the cut-in portion pushed open by the increase in the internal pressure of the packaging bag. The packaging bag according to claim 1 or 2, wherein a part of the material is torn.

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