JP5289773B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag that can store foods and the like inside and can be stored by closing a zipper.

  2. Description of the Related Art Conventionally, for the purpose of storing foods and the like in a refrigerator or the like, a packaging bag provided with a zipper that can be opened and closed at the opening of a packaging bag made of a pouch or the like is widely used. In general, since such a zipper has high sealing performance and poor air permeability, if the foodstuff inside is placed in a microwave oven and heated with the zipper closed, the packaging bag expands and bursts due to water vapor generated from the food. There is a fear.

In order to solve this problem, the base piece or the like formed on the base of the chuck is adhered to the inner surface of the opening of the bag body, and an adhesive portion having an appropriate length in the longitudinal direction is bonded to the surface, A bag body has been proposed in which the interval is a ventilation part inside and outside the bag body (see, for example, Patent Document 1). The bag body has a structure in which water vapor filled inside escapes from the ventilation portion to the outside.
JP 2000-25595 A

  However, if the packaging bag itself is large and contains a large amount of food or the like, or if the microwave oven has a high output, the amount of water vapor generated by heating increases accordingly. The ventilation part of the bag described in Patent Document 1 is formed between the chuck and the bag. Basically, since the chuck is bonded to the bag, the opening area is limited. Therefore, when a large amount of water vapor is generated as described above, there is a possibility that the water vapor may be ruptured without being released to the outside.

  This invention is made | formed in view of the said situation, and it aims at providing the packaging bag which can be heated with a microwave oven safely in the state which accommodated foodstuffs and closed the zipper.

The packaging bag of the present invention is a packaging bag formed by integrally joining a front member and a rear member, and having an opening, and has a first engagement protrusion formed over the longitudinal direction, and the opening. A first zipper member provided on the inner surface of the portion, and a second engagement protrusion formed over the longitudinal direction and engageable with the first engagement protrusion, provided on the inner surface of the opening, A second zipper member that engages with the first zipper member and seals the opening in an openable and closable manner, and the first zipper member is at least in the first region including both longitudinal ends. A second seal sandwiched between the first regions and fixed to the inner surface of the opening by a first seal portion provided without gaps in the longitudinal direction of the first zipper member on the opening side from the mating protrusion. In the area, longitudinal Bonding distance from the direction center to the position of the predetermined value within and the opening side, the dimension in the longitudinal direction exceeds the engaging force between the second zipper member only by stress concentration seal provided so as to be within a predetermined value The strength is fixed to the inner surface of the opening.

  The “inner surface” refers to the surfaces of the front member and the rear member that face each other inside the packaging bag. Further, “sealing” means that the state is such that solid handling is prevented in daily handling or in a normal storage state.

  In the packaging bag of the present invention, when the first zipper member and the second zipper member are engaged with each other and heated by the microwave oven, the internal pressure is increased by water vapor generated by the heating, and the stress concentration seal is predetermined. When a stress greater than the value acts, the engagement between the first zipper member and the second zipper member is released, and the internal water vapor is discharged to the outside.

The packaging bag of this invention may be further provided with the sealing part which is provided in the said opening part side from the said 1st zipper member and the said 2nd zipper member, and seals the said opening part so that opening and closing is possible.
In addition, “sealing” means that daily handling is performed, or in a normal storage state, there is no risk of invasion of gas or microorganisms.
In this case, during normal storage, a highly storable packaging bag can be configured by securing the sealed state in the packaging bag by the sealing portion.

  According to the packaging bag of the present invention, it is possible to safely heat in a microwave oven in a state where foodstuffs are stored and the zipper is closed.

Hereinafter, the packaging bag of 1st Embodiment of this invention is demonstrated with reference to FIGS. 1-7.
FIG. 1 is a perspective view of the packaging bag 1 of the present embodiment. The packaging bag 1 is a storage bag used for storing foods and the like in a refrigerator or freezer. The packaging bag 1 includes a front member 2 and a back member 3 joined to the front member 2.

As shown in FIG. 1, the front member 2 and the back member 3 are formed by integrally joining the end portions except the first end portion 4. The first end portion 4 includes the front member 2 and the back surface member. An opening 5 for accommodating food and the like is formed by the member 3.
In the following description, unless otherwise specified, expressions such as up, down, left, and right are as shown in FIG. 1 with the front member 2 as the front, the first end 4 as the upper end, and the opposite side of the first end 4. The state with the second end 6 as the lower end is used as a reference.

The front member 2 and the back member 3 are formed of a sheet-like flexible film (hereinafter referred to as “main body film”) having heat-fusibility.
The main film is made of polyester, nylon, polyethylene terephthalate, or a laminate of these layers and a base layer on which an inorganic compound such as aluminum oxide or silicon oxide is deposited, and a heat-fusible layer made of polypropylene (PP) or the like is laminated. Is formed.

  2 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 2, a first zipper member 7 made of PP or the like is provided on the inner surface of the front member 2 of the opening 5 in the left-right direction (the length direction of the first end). Similarly, a second zipper member 8 that engages with the first zipper member 7 is provided on the inner surface of the back member 3. As the material of the second zipper member 8, the same material as the first zipper member 7 can be adopted.

  The first zipper member 7 includes a first engagement protrusion 7A provided in the longitudinal direction and a belt-like support portion 7B to which the first engagement protrusion 7A is attached. The support portion 7B is a means such as heat fusion. And fixed to the inner surface of the front member 2. Similarly, the second zipper member 8 is composed of a second engagement protrusion 8A that sandwiches and engages the first engagement protrusion 7A, and a belt-like support portion 8B to which the second engagement protrusion 8A is attached. The part 8B is fixed to the inner surface of the back member 3. And when the 1st zipper member 7 and the 2nd zipper member 8 engage, the opening part 5 is closed so that opening and closing is possible.

FIG. 3 is an enlarged view of a portion of the front member 2 to which the first zipper member 7 is attached. In the first region R1 having a predetermined length from both ends in the longitudinal direction, the support portion 7B is entirely attached to the inner surface of the front member 2 by means such as heat fusion on both sides in the width direction of the first engagement protrusion 7A. The first seal portion 9 is sealed and provided in the longitudinal direction of the first zipper member 7.
On the other hand, in the second region R2 sandwiched between the first regions R1, the second end 6 side on the lower side in FIG. 3 is not sealed. On the other hand, on the side of the opening 5, a stress concentration seal 10 is locally provided at the longitudinal center of the first zipper member 7, and the front member 2 and the first zipper member 7 are located only at the stress concentration seal 10. It is joined.

The stress concentration seal 10 is formed in a substantially triangular shape with the apex directed toward the first engagement protrusion 7 </ b> A, and joins the front member 2 and the first zipper member 7 in the same manner as the first seal portion 9. As will be described later, stress is concentrated on the stress concentration seal 10 when the packaging bag 1 is heated in the microwave, and the engagement of the first zipper member 7 is released.
In order to concentrate stress well, the dimension of the stress concentration seal 10 in the longitudinal direction of the first zipper member 7 is preferably 4 millimeters (mm) or less.

The operation | movement at the time of use of the packaging bag 1 comprised as mentioned above is demonstrated.
First, the user releases the engagement between the first zipper member 7 and the second zipper member 8 to widen the opening 5, accommodates the food F therein, and the first zipper member 7 and the second zipper member 7 as shown in FIG. 2 The zipper member 8 is engaged and sealed. In this state, the food F can be stored in the refrigerator or freezer.

When heating the food F in a microwave oven, as shown in FIG. 4, it puts in the microwave oven, with the 1st zipper member 7 and the 2nd zipper member 8 engaging.
When the food F is heated in a microwave oven, water vapor is generated and the packaging bag 1 expands. Accordingly, a steaming space S in which high-temperature water vapor stays is formed in the upper part of the food F, as shown in FIG.

When an amount of water vapor exceeding the volume of the packaging bag 1 is generated, a part of the water vapor enters the second region R2 where the support portion 7B of the first zipper member 7 and the front member 2 are not joined.
At this time, as indicated by an arrow A in FIG. 5, a force that separates the first zipper member 7 is applied to the front member 2 by water vapor. This force is concentrated only on the stress concentration seal 10 where the front member 2 and the first zipper member 7 are joined in the second region R2.

  FIG. 6 is a view of the second region R2 viewed from the opening 5 side when water vapor enters. Due to the ingress of water vapor, the front members 2 on both sides of the stress concentration seal 10 are separated from the first zipper member 7 and pushed upward in FIG. 6 as indicated by arrows, and the vent holes 11A and 11B are opened. And water vapor | steam is suitably discharge | released outside from vent hole 11A, 11B.

At this time, in the stress concentration seal 10, as indicated by the arrow B, the stress to pull up the front member 2 together with the joined first zipper member 7 is concentrated. Therefore, a large force acts on the stress concentration seal 10 together with the force indicated by the arrow A in FIG.
On the other hand, the back member 3 is applied with a force to move downward together with the second zipper member 8 joined together.

  If a large amount of water vapor is generated inside the packaging bag 1 and the release of water vapor is not in time with only the vent holes 11A and 11B, the internal pressure of the packaging bag 1 is increased by the water vapor. When the internal pressure becomes a predetermined value or more and the sum of stresses acting on the stress concentration seal 10 becomes a predetermined value or more and exceeds the engagement force between the first zipper member 7 and the second zipper member 8, as shown in FIG. Part of the first zipper member 7 integrated with the front member 2 in the stress concentration seal 10 is pulled up to the front member 2 side, the engagement between the first zipper member 7 and the second zipper member 8 is released, and the opening is opened. Excess water vapor is discharged from the portion 5 to the outside of the packaging bag 1. In this way, the packaging bag 1 is prevented from being ruptured due to the water vapor filling while maintaining the steaming space S.

  According to the packaging bag 1 of the present embodiment, when the water vapor generated in the packaging bag 1 increases and the internal pressure of the packaging bag 1 exceeds a predetermined value, the first zipper member 7 is caused by the stress concentrated on the stress concentration seal 10. And the second zipper member 8 are disengaged so that the steam escapes from the opening 5 to the outside. Therefore, it is possible to heat the internal foods and the like by the microwave while reliably preventing the explosion due to water vapor.

  In addition, since the places where water vapor is released to the outside are formed in three places, the ventilation holes 11A and 11B and the opening 5, even if the food F etc. splashes and moves to the opening 5 side, all three places There is no blockage at a time, and it is difficult for a situation to occur that makes it difficult to discharge steam. Therefore, it can be heated more safely in the microwave.

  Further, when water vapor is generated, the vent holes 11A and 11B are first opened to allow the above to escape to the outside. Since the engagement with the zipper member 8 is released and the opening 5 is opened, the volume and the internal pressure of the steaming space S are maintained to some extent to ensure good heating, while preventing explosion and using safely. Can do.

  Furthermore, since the stress concentration seal 10 is formed in a substantially triangular shape and the apex is directed to the first engagement protrusion 7A, the stress is more easily concentrated on the apex, and the first zipper member 7 is securely connected to the first zipper member 7 by water vapor. The engagement with the second zipper member 8 is released.

  In addition, since the front member 2 is formed of a single sheet-like main body film, the number of parts is small, and the packaging bag can be configured with a simple structure at a low cost.

Subsequently, a second embodiment of the present invention will be described. The difference between the packaging bag 21 of the present embodiment and the packaging bag 1 of the first embodiment described above is that a sealing portion is provided.
In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  FIG. 8 is a perspective view of the packaging bag 21 of the present embodiment. The packaging bag 21 has a bottom member (not shown) interposed between the front member 2 and the rear member 3 on the second end 6 side, and is configured as a so-called standing pouch.

  A sealing portion 22 for sealing the inside of the packaging bag 21 is provided on the opening 5 side from the first zipper member 7. As with the first zipper member 7 and the second zipper member 8, the sealing portion 22 is formed by fixing a pair of zipper members that are engaged with each other to the inner surfaces of the front member 2 and the back member 3, respectively. Since the entire zipper member of the sealing part 22 is sealed, the interior of the packaging bag 21 is completely sealed when the zipper member of the sealing part 22 is engaged.

  When storing foods using the packaging bag 21, the first zipper member 7 and the second zipper member 8 can be engaged to store hermetically, but the second region R2 communicates with the outside. There is room for gas or the like to enter the inside of the packaging bag. When it is desired to further improve the storage stability, the sealing portion 22 is closed and stored, so that gas such as oxygen, floating bacteria, and the like do not enter the packaging bag 21. When heating the foodstuff etc. inside with a microwave oven, the sealing part 22 is opened and it heats with a microwave oven, with the 1st zipper member 7 and the 2nd zipper member 8 engaged.

  According to the packaging bag 21 of the present embodiment, the sealing portion 22 is closed during storage to ensure high storage stability, and during heating, the sealing portion 22 remains engaged with the first zipper member 7 and the second zipper member 8. It can be safely heated in a microwave oven by opening the door.

  Moreover, since the packaging bag 21 is comprised as a standing pouch, the opening part 5 can be located upwards and it can heat with a microwave oven. Therefore, it can heat in the state where the foodstuffs etc. inside are hard to spill out of a packaging bag.

  The embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. is there.

For example, in each of the embodiments described above, an example in which the stress concentration seal 10 is formed in a substantially triangular shape has been described, but the shape of the stress concentration seal is not limited to this. For example, a stress concentration seal 10A in FIG. 9A showing a reference example of the present invention and a stress concentration seal 10B in a modification of the present invention shown in FIG. May be.
However, the stress concentration seal has an adhesive strength that does not cause the bonding between the front surface member 2 and the first zipper member 7 to be peeled off even when a force sufficient to release the engagement between the first zipper member and the second zipper member is applied. It is necessary to design various dimensions such as area and width so that the

In the above-described embodiments, the example in which the first seal portion 9 of the first region R1 is provided on both sides in the width direction of the first engagement protrusion 7A has been described. You may provide only in an opening part side from an engaging protrusion. An example is shown in FIGS. 10 (a) and 10 (b).
FIG. 10A is an enlarged view of the periphery of the first zipper member of the packaging bag 31 according to a modification of the present invention, and FIG. 10B is a cross-sectional view taken along the line BB in FIG. As shown in FIG. 10A, the first seal portion 9A for fixing the support portion 7B of the first zipper member 7 to the front member 2 is provided only on the opening 5 side from the first engagement protrusion 7A. . Further, as shown in FIG. 10B, the support portion 7B and the support portion 8B of the second zipper member 8 are formed of a single member, and by applying force to the intermediate portion 32 formed thinly The support portion 7B and the support portion 8B can be easily cut and separated.
If it does in this way, it will be filled with articles | goods etc. at the time of manufacture of the packaging bag 31, and the said articles | goods may not contact each engaging protrusion 7A, 8A of the 1st zipper member 7 and the 2nd zipper member 8 until the time of opening. Can be sealed. The user can apply a force to the intermediate portion 32 to cut it during use, take out the internal article, and accommodate other articles. The packaging bag 31 after cutting the intermediate portion 32 can be safely heated in a microwave oven in the same manner as the packaging bag of each of the embodiments described above.

  Further, in each of the above-described embodiments, the example in which the first seal portion 9 and the stress concentration seal 10 are provided on the first zipper member 7 side has been described, but these are provided on the second zipper member 8 side. Also good. In this case, a stress concentration seal may be provided on the opening 5 side of the two second engaging projections 8B than on the opening 5 side.

  Furthermore, the opening need not be provided at the end of the packaging bag such as the first end, and may be provided in the center of the front member along the left-right direction or the up-down direction. In this case, what is necessary is just to attach a 1st zipper member and a 2nd zipper member to the inner surface of the front surface member of the both sides of an opening part.

  Furthermore, the front member and the back member do not need to be separate, for example, a single body film is folded so that the heat-fusible layers face each other, and the packaging bag is formed by joining the ends. Good.

In the reference example of the present invention, as shown in FIG. 9 (a), the first seal portion 9B in the first region R1 is formed so as to be sealed at a predetermined interval in the left-right direction. Alternatively, it may be formed as an auxiliary vapor hole.

It is a perspective view which shows the packaging bag of 1st Embodiment of this invention. It is sectional drawing in the AA of FIG. It is an enlarged view which shows the front member around the 1st zipper member of the packaging bag. It is sectional drawing which shows the state when carrying out sealing and heating cooking after the packaging material is put into the packaging bag. It is sectional drawing in the up-down direction which shows the state which water vapor | steam generate | occur | produced at the time of the heating of the packaging bag. It is the figure which looked at the 1st zipper member periphery in the state where water vapor entered when heating the packaging bag from the opening side. It is sectional drawing which shows the state from which water vapor | steam entered and the engagement with the 1st zipper member and the 2nd zipper member was cancelled | released. It is a perspective view which shows the packaging bag of 2nd Embodiment of this invention. (A) And (b) is an enlarged view which shows the front member of the 1st zipper member periphery in the reference example and modification of this invention. (A) is an enlarged view which shows the front member around the 1st zipper member in the modification of this invention, (b) is sectional drawing in the BB line of (a).

Explanation of symbols

1, 21, 31 Packaging bag 2 Front member 3 Back member 5 Opening portion 7 First zipper member 7A First engagement protrusion 8 Second zipper member 8A Second engagement protrusions 9, 9A, 9B First seal portion 10 Stress concentration Seal 22 Sealing portion R1 First region R2 Second region

Claims (2)

The front member and the rear member are integrally joined to form a packaging bag having an opening,
A first zipper member having a first engagement protrusion formed over the longitudinal direction and provided on the inner surface of the opening;
A second engagement protrusion formed over the longitudinal direction and engageable with the first engagement protrusion is provided on the inner surface of the opening, and engages with the first zipper member to cause the opening to A second zipper member that can be freely opened and closed;
With
The first zipper member is
In the first region including both ends in the longitudinal direction , the opening is provided by a first seal portion that is provided at least on the opening side from the first engagement protrusion without being spaced over the longitudinal direction of the first zipper member. Fixed to the inner surface of the
In the second region sandwiched between the first regions, the stress concentration is provided so that the distance from the center in the longitudinal direction is within a predetermined value and the dimension in the longitudinal direction is within the predetermined value at a position on the opening side. A packaging bag, which is fixed to an inner surface of the opening with an adhesive strength exceeding an engagement force with the second zipper member only by a seal.   2. The packaging bag according to claim 1, further comprising a sealing portion that is provided closer to the opening than the first zipper member and the second zipper member and seals the opening in an openable and closable manner.

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