JP6997663B2 - Bag body and method of manufacturing the bag body - Google Patents

Description

The present invention relates to a bag body and a method for manufacturing the bag body.

Conventionally, a bag that stores food and the like and can be cooked has been widely used. Patent Document 1 describes a configuration in which such a bag body is provided with a steam venting mechanism that prevents it from excessively expanding and bursting during cooking. The bag body described in Patent Document 1 is a steam vent having a weakened seal portion whose peripheral edge is weakened and sealed on the bag body so as to close a circular notch provided in the vicinity of the side seal portion of the bag body. Has a mechanism. This steam removal mechanism prevents the bag body from expanding excessively and bursting due to the weakened seal part peeling off and the steam being released from the notch when the internal pressure increases to some extent due to the steam generated during cooking. ..

Japanese Unexamined Patent Publication No. 2013-466444

However, when the weakened seal portion is used for the steam removal mechanism as described in Patent Document 1, the internal pressure at which the release of steam is started varies depending on the bonding strength of the weakened seal portion. Further, if the bonding strength of the weakened seal portion is not uniform, the amount of water vapor released may be reduced by partially peeling off the weakened seal portion. As described above, in the technique described in Patent Document 1, it is not easy to form a steaming portion capable of stably releasing water vapor because the processing conditions of the weakened seal portion affect the release of water vapor.

Therefore, the present invention is a novel and improved method capable of easily forming a steaming portion capable of stably releasing water vapor in a bag body capable of forming a steaming portion using a tape member. It is an object of the present invention to provide a bag body and a method for manufacturing the bag body.

According to one aspect of the invention, a bag body having at least first and second surfaces facing each other and a storage space formed between the first and second surfaces, and the first and second surfaces. It is a bag body provided with a tape member arranged between the surface and defining one side of the storage space, and in the first section of the tape member in the longitudinal direction, the tape member is the first and first in the width direction. In at least one of the second or third regions, it is joined to both the first and second surfaces, and in the second section in the longitudinal direction, the tape member is only in the first surface in the first region in the width direction. It is joined, in the second region it is not joined to the first or second surface, in the third region it is joined only to the second surface, the second region is the first region and the third region. A bag between the two is provided.
According to the above configuration, by making the breaking strength of the tape member in the second region weaker than the bonding strength between the bag body and the tape member, the tape member when the internal pressure of the storage space rises due to the generation of water vapor. Can be broken only in the second section to release water vapor. By fixing the section where water vapor is released, the amount of water vapor released is stable. Further, since the breaking strength of the tape member is determined by the material and the shape, it is not greatly affected by the processing conditions. Therefore, according to the above configuration, it is possible to easily form a steaming portion capable of stably releasing water vapor.

According to another aspect of the present invention, in the above-mentioned method for manufacturing a bag body, the tape member is joined to the second surface in the first section and only the third region of the tape member is bonded in the second section. The first step of joining to the second surface and the second step of joining the tape member to the first surface in the first section and joining only the first region of the tape member to the first surface in the second section. A method for manufacturing a bag including a step is provided. A step of filling the storage space with the contents may be carried out between the first step and the second step.

It is a front view of the bag body which concerns on one Embodiment of this invention. It is a back view of the bag body which concerns on one Embodiment of this invention. FIG. 3 is a sectional view taken along line III-III of the bag body shown in FIG. FIG. 3 is a sectional view taken along line IV-IV of the bag body shown in FIG. It is a figure for demonstrating the behavior at the time of steaming of the bag body which concerns on one Embodiment of this invention. It is a figure for demonstrating the behavior at the time of steaming of the bag body which concerns on one Embodiment of this invention.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, the components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description thereof will be omitted.

(Structure of bag body)
1 and 2 are a front view and a rear view of a bag body according to an embodiment of the present invention. It should be noted that the terms front and back are used only for the purpose of explaining the figure and are commutative. 3 and 4 are cross-sectional views of the bag body shown in FIG. 1 along lines III-III and IV-IV. Hereinafter, the configuration of the bag body according to the present embodiment will be described with reference to these figures.

As shown, the bag body 100 is between a film 110 forming a bag body having a first surface 111A and a second surface 111B facing each other and a first surface 111A and a second surface 111B of the film 110. Includes a tape member 120 to be arranged. As will be described later, at least a part of the tape member 120 in the width direction is joined to the first surface 111A and the second surface 111B, thereby between the first surface 111A and the second surface 111B of the film 110. One side of the storage space SP to be formed is defined. A thin wall portion 121 extending in the longitudinal direction is formed near the center of the tape member 120 in the width direction (y direction in the drawing).

The film 110 is formed of, for example, a single-layer or multi-layer thermoplastic resin. More specifically, the film 110 may be made of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). The PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). When the film 110 has multiple layers, biaxially stretched polypropylene (OPP), biaxially stretched polyethylene terephthalate (OPET), or biaxially stretched nylon (ONy) may be used as the surface substrate. Further, the film 110 may include a layer of an inorganic material formed by vapor deposition of aluminum, lamination of aluminum foil, or the like.

In the present embodiment, the two films 110 are joined to each other at the bottom seal portion 112 and the side seal portion 113 to form a bag body having the first surface 111A and the second surface 111B, but they are different. In the embodiment, the first surface 111A and the second surface 111B may be formed by folding one film 110 at a portion corresponding to the side seal portion 113. Alternatively, a portion in which the film 110 is folded inward, a so-called gusset, may be formed at a portion corresponding to the bottom seal portion 112 or the side seal portion 113 in the example of FIG. In this case, the gusset may be formed by the film 110 or by another film bonded to the film 110. Further, the bag body 100 may be a standing pouch that can be placed upright by forming a gusset on the bottom.

Further, in the present embodiment, the bottom seal portion 112 and the side seal portion 113 are formed, while the opening portion 101 of the bag body 100 is formed by not forming the top seal portion, but in another embodiment, the opening portion 101 is formed. A top seal portion is formed in addition to the bottom seal portion 112 and the side seal portion 113, and an opening 101 can be subsequently formed in the bag body 100 by cutting between the top seal portion and the tape member 120. It may be possible. In yet another embodiment, the bag may be provided in a state where the bottom seal portion 112 is not formed, that is, the storage space SP is not sealed on the opposite side of the tape member 120. In this case, the bottom seal portion 112 is formed after the storage space SP is filled with the contents. In addition to this, the present invention can be applied to bags having various known configurations.

The tape member 120 is formed, for example, by extrusion molding of a polyolefin resin. More specifically, the tape member 120 may be made of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), or polypropylene (PP). The PP may be homopolypropylene (HPP), random polypropylene (RPP), or block polypropylene (BPP). Known additives such as stabilizers, antioxidants, lubricants, antistatic agents, colorants and the like may be added to the material of the tape member 120, if necessary.

As shown in FIGS. 1 and 2, the tape member 120 is divided into a _first section S1 and a _second section S2 in the longitudinal direction (x direction in the drawing). As will be described below, the bonding state between the tape member 120 and the first surface 111A and the second surface 111B of the film 110 is different between the _first section S1 and the _second section S2. In order to explain this joining state, as shown in FIGS. 3 and 4, the width direction (y direction in the drawing) of the tape member 120 is the first region R ₁ , the second region R ₂ , and the third region. The region _R3 of is defined. Here, as shown, the second region R ₂ is between the first region R ₁ and the third region R ₃ .

First, as shown in FIG. 3, in the _first section S1, the tape member 120 is joined to both the first surface 111A and the second surface 111B of the film 110 in the _first region R1 in the width direction. There is. In the example shown in FIG. 3, the tape member 120 is joined to the second surface 111B in the _third region R3, but this joining is optional. That is, in the _third region R3, the tape member 120 may be bonded to both the first surface 111A and the second surface 111B, may be bonded to either one, or may be bonded to both. It does not have to be. Further, the second region R ₂ is a region corresponding to the thin wall portion 121 formed on the tape member 120, but the tape member 120 in the second region R ₂ is joined to the first surface 111A and the second surface 111B. Is also optional.

On the other hand, as shown in FIG. 4, in the _second section S2, the tape member 120 is joined only to the first surface 111A of the film 110 in the _first region R1 in the width direction, and the second region _R2 Is not joined to the first surface 111A or the second surface 111B, and is joined only to the second surface 111B in the _third region R3. In the illustrated example, in order to bond the tape member 120 and the film 110 as described above, when the tape member 120 is bonded to the film 110 by heat sealing, the front side shown in FIG. 1 is from the tape member 120. Using a narrow seal bar, the bonding region 140A is formed only in the _first region R1 in the width direction over the entire length of the tape member 120. On the back side shown in FIG. 2, a seal bar having a width substantially the same as that of the tape member 120 having a notch or a heat insulating portion formed therein is used, and in the first section S1, the _first region _R1 in the width direction is used. The joining region 140B is formed in all of the _third region R3 from the to third region R3, and the joining region 140B is formed only in the _third region R3 in the width direction in the _second section S2. The method of joining the tape member 120 and the film 110 is not limited to heat sealing, and the tape member 120 and the film 110 may be joined by welding with ultrasonic waves or bonding with an adhesive. Also in these cases, by changing the region for outputting ultrasonic waves and the region for applying the adhesive, the tape member 120 and the film 110 in the _first section S1 and the _second section S2 as described above can be used. Can be joined.

(Behavior during steaming)
5 and 6 are diagrams for explaining the behavior of the bag body during steaming according to the embodiment of the present invention. FIG. 5 corresponds to the rear view of FIG. 2 described above, and FIG. 6 corresponds to the cross-sectional view of FIG. As shown in FIG. 5, in the bag body 100 according to the present embodiment, when the content C containing water such as food is stored in the storage space SP and heated using a microwave oven, the content C The internal pressure of the storage space SP rises due to the water vapor generated from the storage space SP, and at a certain point, the storage space SP communicates with the external space in the _second section S2 of the tape member 120, so that the water vapor ST is released. As shown in FIG. 6, at this time, in the _second section S2 of the tape member 120, the tape member 120 breaks at the thin portion 121 due to the internal pressure of the storage space SP, so that the storage space SP communicates with the external space. is doing.

Here, as described above with reference to FIG. 3, in the _first section S1 of the tape member 120, the tape member 120 is at least the first surface 111A of the film 110 in the _first region R1 in the width direction. And because it is bonded to the second surface 111B, the bonding strength between the film 110 and the tape member 120 opposes the internal pressure of the storage space SP. On the other hand, in the second section S2, the storage space is not joined between the tape member 120 and the first surface 111A in the _third region R3 and the _second region _R2 on the storage space SP side. The internal pressure of the SP extends to the first surface 111A side of the _second region R2. On the other hand, since the tape member 120 and the second surface 111B are not joined in the first region _R1 and the _second region R2 on the opening 101 side, the _second surface 111B side of the second region R2 is Communicate with the external space.

As a result, for example, if the breaking strength of the tape member 120 in the thin-walled portion 121 located in the _second region R2 is made weaker than the bonding strength between the film 110 and the tape member 120, the storage space SP is generated by the generation of water vapor. When the internal pressure of the tape member 120 rises, the tape member 120 can be broken only in the _second section S2 to release water vapor. By fixing the section where water vapor is released, the amount of water vapor released is stable. Further, since the breaking strength of the tape member 120 is determined by the material and the shape, it is not greatly affected by the processing conditions.

In one embodiment of the present invention as described above, the amount of water vapor released when the content C is heated can be stabilized by allowing the _second section S2 of the tape member 120 to function as a steaming section. can. That is, in the present embodiment, even if the bonding strength between the film 110 and the tape member 120 is not changed, in the width direction of the tape member 120 between the _first section S1 and the _second section S2. Since the steaming portion can be formed on the film 110 by changing the bonding region, it is possible to easily form the steaming portion that opens at a constant internal pressure and releases a stable amount of water vapor.

In the above example, the thin portion 121 is formed on the tape member 120, but the breaking strength of the tape member 120 in the _second region R2 in the width direction is weaker than the bonding strength between the film 110 and the tape member 120. If possible, the thin-walled portion 121 does not necessarily have to be formed. For example, the breaking strength of the tape member 120 itself is relatively low, and the tape member 120 is formed in the _second region R2 of the _second section S2 when the internal pressure of the storage space SP rises without forming the thin wall portion 121. It may be broken.

Further, in the above example, in the width direction of the tape member 120, the first region R ₁ , the second region, and the third region R ₃ are in this order from the opening 101 side toward the storage space SP side. Although they are arranged, on the contrary, each region may be arranged in the above order from the storage space SP side toward the opening 101 side. As described above, after forming the top seal portion in the bag body 100, the opening 101 may be formed in the bag body 100 after the fact by cutting between the top seal portion and the tape member 120. It is possible. Therefore, the tape member 120 may be arranged so that the opening 101 of the bag body 100 is located on the side opposite to the storage space SP, or the opening 101 of the bag body is formed on the side opposite to the storage space SP. It may be arranged so that a possible portion is located.

Further, in the above example, in the longitudinal direction of the tape member 120, the vicinity of the center is designated as the _second section S2, and the other portion is designated as the _first section S1, but the first section in the longitudinal direction. The arrangement of S ₁ and the second section S ₂ may be any. For example, the _second section S2 may be arranged at one or both ends of the tape member 120 in the longitudinal direction. Alternatively, a plurality of _second sections S2 may be arranged at the end or the middle of the tape member 120.

Further, in the above example, as for the method of manufacturing the bag body 100, an example using a seal bar forming the joint region 140A on the front side and a seal bar forming the joint region 140B on the back side has been described. The formation of the joining regions 140A and 140B by the bars does not necessarily have to be performed at the same time. For example, the storage space SP may be sealed by distributing a semi-finished product of the bag body 100 in which the joint region 140B is formed first and forming the joint region 140A after filling the contents C. Such a process is adopted, for example, when the bag body 100 is a standing pouch.

In the above case, the tape member 120 is joined to the second surface 111B of the film 110 in the _first section S1, and only the _third region R3 in the width direction of the tape member 120 is seconded in the _second section S2. After the first step of joining to the surface 111B (the step of forming the joining region 140B), a step of filling the storage space SP with the contents C is carried out, and then the tape member 120 is filmed in the _first section S1. A second step (a step of forming the joining region 140A) of joining the first surface 111A of the 110 and joining only the _first region R1 in the width direction of the tape member 120 to the first surface 111A in the _second section S2. ) Is carried out. The order of the first step and the second step may be interchanged. In either case, the step of filling the storage space SP with the content C is carried out between the first step and the second step.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. Of course, it is understood that it belongs to the technical scope of the present invention.

100 ... bag body, 101 ... opening, 110 ... film, 111A ... first surface, 111B ... second surface, 120 ... tape member, 121 ... thin wall part, 140A, 140B ... joining area, SP ... storage space, C ... Contents, S ₁ ... 1st section, S ₂ ... 2nd section, R ₁ ... 1st area, R ₂ ... 2nd area, R ₃ ... 3rd area.

Claims (8)

A bag body having at least a first surface and a second surface facing each other and a storage space formed between the first surface and the second surface.
A bag body provided with a tape member arranged between the first surface and the second surface and defining one side of the storage space.
In the first section of the tape member in the longitudinal direction, the tape member is in at least one of the first, second or third regions in the width direction on both the first surface and the second surface. In the second section in the longitudinal direction, the tape member is joined only to the first surface in the first region in the width direction, and in the second region, the first surface is also joined to the second surface. In the third region, it is joined only to the second surface.
The second region lies between the first region and the third region .
The first section and the second section are bags that are in contact with the storage space . The bag according to claim 1, wherein a thin wall portion extending in the longitudinal direction is formed in the tape member, and the second region corresponds to the thin wall portion. The bag according to claim 1 or 2, wherein the tape member is arranged so that the opening of the bag is located on the side opposite to the storage space. The bag according to claim 1 or 2, wherein the tape member is arranged so that a portion capable of forming an opening of the bag is located on the side opposite to the storage space. The bag body according to any one of claims 1 to 4, wherein the bag body forms a standing pouch. The bag according to any one of claims 1 to 4, wherein the storage space is not sealed on the side opposite to the tape member. The method for manufacturing a bag according to any one of claims 1 to 6.
The first step of joining the tape member to the second surface in the first section and joining only the third region of the tape member to the second surface in the second section.
A bag including a second step of joining the tape member to the first surface in the first section and joining only the first region of the tape member to the first surface in the second section. How to make a body. The method for manufacturing a bag according to claim 7, wherein a step of filling the storage space with the contents is carried out between the first step and the second step.

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