JPH10101099A - Storing bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress invasion of foreign matters through vents for evacuation which can smoothly evacuate unnecessary gas in a bag after sealing outside while decrease in storing vol. of the bag and decrease in bonding strength are avoided as much as possible. SOLUTION: Flexible bent parts 3 being opened to the outer face side of a bag 1 and penetrated into a storing space 2 under bent condition are formed on a part of the bag 1 and the base side laminated parts of this bent parts 3 are bonded under a condition where unbonded parts for forming vents 5 for communicating the inner spaces 4 formed between facing inner faces of the bent parts 3 with the outside are left and communicating holes 6 for communicating the storing space 2 with the inner spaces 4 are formed on the bent parts 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage bag for a storage object which is likely to generate steam or gas after storage (after packing), such as cereals or fertilizer immediately after whitening. ,
More specifically, the present invention relates to a storage bag in which a ventilation passage for exhausting the storage space of the bag and the outside is formed in the bag.

[0002]

2. Description of the Related Art Conventionally, as a storage bag of this type, two sheets of a heat-fusible rectangular synthetic resin film are superimposed on each other, and an opening for inputting a stored object is included in the superimposed films. The other three side edge parts except the side edge part where is formed are heat-sealed while leaving a non-heat-sealed part that exposes a ventilation path for communicating the storage space in the bag body to the outside. Bonded ones have been proposed (for example, see
-96951, JP-A-8-11943 and JP-A-8-40466).

[0003]

In the above-mentioned conventional storage bag, when storing the stored items, the opening is heat sealed or sealed with a sealing tool while many gases are simultaneously sealed in the storage space of the bag body. Even if the bag is sealed, or if gas is generated from the stored item after the sealing, unnecessary gas in the bag can be discharged to the outside through the air passage, so that an external force acts on the bag expanded by the gas. Damage such as rupture at the time can be suppressed. Moreover, since the air passage is formed at a part of the peripheral portion of the bag body which is joined by heat fusion, the air passage is easily maintained in a close contact state by a joining portion located around the air passage, For example, JP-A-3-645
As disclosed in Japanese Unexamined Patent Publication (Kokai) No. H07-163, there is an advantage that the invasion of foreign matter can be suppressed as compared with the case where the air passage is formed in a portion other than the joint portion of the bag.

However, in order to more effectively suppress the entry of foreign matter through the air passage, the air passage must be configured to be long. When the volume of the space is reduced and the air passage is formed in a zigzag shape along the longitudinal direction of the joint portion of the bag body, the length of the air passage can be sufficiently secured, but the air passage formation portion There is a problem that the joining strength of the joining portion is reduced over a correspondingly wide range.

The present invention has been made in view of the above circumstances, and an object of the present invention is to enable unnecessary gas in a sealed bag to be smoothly discharged to the outside. It is an object of the present invention to provide a storage bag that can effectively prevent foreign matter from entering through a ventilation passage for exhaust while minimizing a reduction in storage volume of the bag body and a decrease in bonding strength.

[0006]

According to a first aspect of the present invention, there is provided a storage bag according to the present invention, wherein a part of a bag is opened on the outer surface side of the bag and the storage bag is opened. A flexible bent portion that enters the space in a bent state is formed, and a base end side overlapping portion of the bent portion forms an air passage for communicating an internal space formed between opposed inner surfaces of the bent portion to the outside. The present invention is characterized in that joining is performed while leaving a non-joining portion protruding, and a communication hole communicating the storage space and the internal space is formed in the bent portion. According to the above-mentioned characteristic configuration, at the time of storing the stored items, even when a large amount of gas is simultaneously sealed in the storage space of the bag body and the opening is sealed by heat sealing or other sealing means or the like, or Even when gas is generated from the stored product, unnecessary gas in the storage space can be discharged to the outside through the communication hole of the bent portion, the internal space formed between the opposed inner surfaces of the bent portion, and the ventilation path. In addition, at the time of this discharge, the internal space can be secured between the opposed inner surfaces of the bent portion by utilizing the strength of the waist at the bent portion on the distal end side of the bent portion, so that unnecessary gas in the storage space can be secured. Can be smoothly guided to the ventilation path side through the communication hole. In addition, the length of the exhaust passage can be substantially increased by an amount corresponding to the bent portion that exposes the internal space communicating with the ventilation path entering the storage space. Since there is flexibility, the bent portion can be freely deformed according to the stored articles put into the storage space. Therefore, while the unnecessary gas in the sealed bag body can be smoothly discharged to the outside, the invasion of foreign matter through the exhaust air passage reduces the storage volume of the bag body and the bonding strength. The reduction can be effectively suppressed while avoiding as much as possible.

A characteristic configuration of the storage bag according to the second aspect of the present invention is that the bent portion is formed by folding a part of the bag body into the storage space side. According to the above-mentioned characteristic configuration, the cutting step for forming the bent portion, and the step of aligning the bag and the bent portion are performed in comparison with the case where the bent portion is formed separately from the bag body. Since it becomes unnecessary, the manufacturing cost of the storage bag can be reduced accordingly.

According to a third aspect of the present invention, there is provided a storage bag, wherein the bent portion is formed separately from the bag body, and a base-side polymerized portion of the storage bag is bonded to the bag body. It is located between the parts. According to the above-mentioned characteristic configuration, since the bent portion is formed separately from the bag, the bent portion corresponding to the shape of the bag can be easily manufactured, and the variation of the shape of the bag can be diversified. Can be achieved.

The storage bag according to a fourth aspect of the present invention is characterized in that the bag body is a heat-fusible synthetic resin film formed in a tubular shape, and a part of the tubular film is stored. This is in that the bent portion is formed by folding the space into the space. According to the above feature configuration,
Since only a part of the tubular film constituting the bag body can be folded into the storage space side to form a bent portion,
Since the number of manufacturing steps can be greatly reduced compared to the case where the bent portion is formed separately from the bag body, and automation can be easily achieved, the productivity of the storage bag can be improved. Can be achieved.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Figs. 1 to 4 show a first embodiment of a storage bag of the present invention manufactured from a film made of synthetic resin.
Each of the left and right side edges, which are part of the bag 1 that opens in the vertical direction, has a flexible bent portion 3 that opens on the outer surface side of the bag 1 and that enters the storage space 2 in a bent state. Is formed, and the base-side superposed portion 3A of the bent portion 3 and the superposed portion 1A of the bag body 1 superposed thereon communicate with the outside through the internal space 4 formed between the opposed inner surfaces of the bent portion 3. A joint for connecting the storage space 2 and the internal space 4 to the bent portion 3 is formed in such a manner that a non-joined portion that exposes the air passage 5 for the connection is left at a plurality of positions along the side edge portion of the bag body 1. A large number of communication holes 6 are formed, and the lower edge portion of the bag 1 is joined and closed. The upper edge portion of the bag body 1 is formed in an opening 7 for accommodating grains, such as milled rice and pearled wheat, which are an example of stored items, such as polished rice and barley from the outside in the storage space 2. .

More specifically, as shown in FIGS. 2 to 4, the bag 1 is made of a single layer of polyethylene (a multilayer structure described later) which is an example of a heat-sealable synthetic resin manufactured by an inflation method. The bent portion 3 is configured to be a part of the tubular film F, that is, the left and right side edges of the bag 1 on the side of the storage space 2. The base portion side overlapping portion 3A of the bent portion 3, the overlapping portion 1A of the bag body 1 that overlaps with the bent portion 3, and the lower edge portion of the bag body 1 are joined by heat fusion. Have been. That is, the non-joined portion that exposes the air passage 5 is constituted by a non-heat-sealed portion. In the drawing, the portion denoted by S indicates a heat-sealed portion.

The group of communication holes 6 is formed in each of the opposing portions of the bent portion 3 in a row along the tube axis direction, and the two communication holes 6 are misaligned in the opposing direction. Are arranged. Further, the size of each communication hole 6 is set according to the size of the storage items stored in the storage space 2 and is formed to have a size that can prevent the storage items from passing therethrough. In other words, when the stored material stored in the storage space 2 is polished rice, the size of each communication hole 6 is formed in a hole smaller than the size of the polished rice grain so that the polished rice cannot pass freely. Is done.

For example, after storing relatively high-temperature grains immediately after the whitening treatment in the storage bag configured as described above, the opening 7 of the bag 1 is joined by heat fusion and sealed. Water vapor is generated from the sealed grains, and the bag 1 expands. At this time, the generated water vapor is passed through the communication hole 6, the internal space 4, and the ventilation path 5 to the inside of the storage space 2 of the bag 1. Can be exhausted to the outside. Moreover, the waist strength of the distal-end bent portion 3B of the bent portion 3, that is,
Since the opposing inner surfaces of the bent portion 3 are urged in a direction in which the opposing inner surfaces of the bent portion 3 are separated from each other by the restoring force of the bent portion 3B elastically restoring to the extended posture, the internal space 4 can be maintained in a hollow state. Thus, the water vapor in the storage space 2 can be smoothly guided through the communication hole 6 to the ventilation path 5. Further, even if a foreign substance (for example, a vermin) enters the ventilation path 5 and moves toward the storage space 2, the foreign substance is easily retained once in the hollow internal space 4,
It is possible to prevent foreign matter that enters from outside through the ventilation path 5 from directly entering the storage space 2. It should be noted that the smaller the opening width of the ventilation path 5 is, the more the foreign matter can be prevented from entering. In this case, it is desirable to increase the number of ventilation paths 5 in order to secure the desired ventilation performance between the outside and the storage space 2.

Next, an example of a method of manufacturing the storage bag according to the first embodiment will be described. A long single-layer tubular film F made of polyethylene manufactured by an inflation method is transferred along the tube axis direction. Meanwhile, portions of the tubular film F corresponding to the left and right side edges of the bag 1 are folded into the storage space 2 side, open to the outer surface side of the tubular film F, and bent into the storage space 2. The bent portion 3 that enters in a state is continuously formed. Thereafter, a large number of communication holes 6 communicating the inside and outside of the tubular film F with the bent portion 3 are formed along the tube axis direction. Then, the long tubular film F is cut to a predetermined length in the tube axis direction to form a bag body 1, and for each of the bag bodies 1, the base-side polymerized portion 3 A of the bent portion 3 and the polymerized The overlapping portion 1A of the bag body 1 is connected to the non-heat-fused portion that exposes the air passage 5 for communicating the internal space 4 formed between the opposed inner surfaces of the bent portion 3 to the outside. In a state where a plurality of portions are left along, the storage bag is manufactured by continuously joining by heat fusion by a heat sealing device and further joining one end side in the tube axis direction by heat fusion. When the above-described manufacturing method is used, the number of members and the number of joints are compared with a case where the bag is formed by laminating two heat-fusible films and the bent portion is formed separately from the bag. Since the number of locations can be reduced, the manufacturing cost of the storage bag can be reduced, and the productivity of the storage bag can be improved.

The method of manufacturing the storage bag according to the first embodiment of the present invention is not limited to the above-described manufacturing method, but may include a large number of the communication holes 6 communicating with the inside and outside of the tubular film F. Is formed along the axial direction of the tube, and the connecting hole 6 is folded into the storage space 2 side, opened on the outer surface side of the tubular film F, and enters the storage space 2 in a bent state. 3 may be formed continuously, and the order of the manufacturing steps can be changed as appropriate.

Second Embodiment FIGS. 5 and 6 show a storage bag according to a second embodiment of the present invention. The bag 1 is made of polyethylene, which is an example of a heat-sealable synthetic resin. The sheet-like film F of a layer (which may have a multilayer structure described later) is joined in a tubular shape by heat fusion. The bent portion 3 is configured such that, of the film F joined in a tubular shape, portions deviated from the joining portion 8 thereof are left and right side edge portions of the bag body 1 and the both side edge portions are folded into the storage space 2 side. Is formed by Other configurations are the same as those of the first embodiment, and the components having the same structure or the same function as the components described in the first embodiment are denoted by the same reference numerals as those of the first embodiment. The description is omitted here.

Third Embodiment FIGS. 7 and 8 show a storage bag according to a third embodiment of the present invention, in which the bag 1 is made of two sheets of polyethylene, which is an example of a heat-sealable synthetic resin. And the bent portion 3 is formed by stacking a single-layered sheet film F (which may be a multilayer structure described later). It is composed of a film F1 of another polyethylene single layer (may be a multilayer structure described later), and the base-side polymerized portion 3A of the bent portion 3 constitutes the bag 1
The bent portion 3B of the bent portion 3 is interposed between the overlapping portions 1A which are joined by thermal fusion of the left and right side edges of the film F and enters the storage space 2. Then, the base-side superposed portion 3A of the bent portion 3 and the superposed portion 1A of the bag body 1 superposed thereon leave a non-heat-fused portion that exposes the air passage 5 similar to the first embodiment. In this state, they are joined by heat fusion. Other configurations are the same as those of the first embodiment, and the components having the same structure or the same function as the components described in the first embodiment are denoted by the same reference numerals as those of the first embodiment. The description is omitted here.

FIG. 9 shows a storage bag according to a fourth embodiment of the present invention, in which the bag 1 is made of a single layer of polyethylene which is an example of a heat-sealable synthetic resin (described later). The sheet-like film F of a multi-layer structure may be folded back, and the folded portion is used as a lower edge portion. Then, by folding a lower edge portion which is a part of the bag body 1 toward the storage space 2 side, the lower edge portion is opened on the outer surface side of the bag body 1 and enters the storage space 2 in a bent state. A bent portion 3 is formed, and a base-side superposed portion 3A of the bent portion 3 and a superposed portion 1A of the bag body 1 superposed on the bent portion 3 are connected to an internal space 4 formed between the opposed inner surfaces of the bent portion 3 by the outside. The non-heat-fused portion (non-joined portion) which exposes the ventilation path 5 for communicating with the bag body 1 is joined by heat fusion while leaving a plurality of places along the lower edge portion of the bag body 1, and the bent portion 3 And storage space 2
A large number of communication holes 6 are formed, which are small holes communicating between the bag body 1 and the internal space 4, and the left and right side edges of the bag 1 are joined by heat fusion.

Other configurations are the same as those of the first embodiment. Components having the same structure or the same function as the components described in the first embodiment are additionally described in the first embodiment. The same numbers are added and the description thereof is omitted.

[Fifth Embodiment] FIG. 10 shows another embodiment of the storage bag according to the fourth embodiment, in which a through hole 9 for finger passage is formed on the side of the opening 3 of the bag body 1 and the gripping portion 10 is formed. Is formed. In this case, the storage space 2 is larger than the place where the through hole 9 is formed.
The opening 3 is closed by thermally welding and joining the parts P deviated inward. Other configurations are the same as those of the fourth embodiment.

[Sixth Embodiment] FIG. 11 shows another embodiment of the storage bag of the fourth embodiment, and a well-known open / close operable member comprising a pair of male and female members is provided on the surface of the bag body 1 facing the opening 3. A fastener 11 is provided. In this case, the bag 1
Opening 3 can be freely opened and closed by the fastener 11. Other configurations are the same as those of the fourth embodiment.

[Other Embodiments] In each of the above-described embodiments, the synthetic resin film F constituting the bag 1 or the synthetic resin constituting the bent portion 3 formed separately from the bag 1 is used. Although the film F1 was composed of a single-layer film made of polyethylene, the present invention is not limited to this configuration. For example, if it is a heat-sealable synthetic resin, it may be a film made of polypropylene or a single film made of a soft vinyl chloride resin. It may be composed of a layer film. In each of the above embodiments, the synthetic resin film F forming the bag 1 or the synthetic resin film F1 forming the bent portion 3 formed separately from the bag 1 is made of a single layer of polyethylene. Although the film is made of a film, the present invention is not limited to this structure. The film may be made of a multilayer film of two or more layers as long as a heat-fusible synthetic resin layer is exposed on both front and back surfaces. As an example of the multilayer film, for example, there is a three-layer film having a nylon layer as an intermediate layer and a polyethylene layer on both front and back sides.
The multilayer film is a multilayer tubular film manufactured by an inflation method, or manufactured by a dry lamination method, a wet lamination method, an extrusion lamination method, a hot-mel lamination method, a co-extrusion lamination method, or the like. The laminated film is used. In each of the above embodiments, the bag 1 is formed of a synthetic resin film. However, the present invention is not limited to this configuration. For example, the bag 1 may be formed by coating both sides of paper or fabric with polyethylene resin. It may be composed of a sheet that has been printed. In each of the above embodiments, the portions to be joined are joined by heat fusion. However, the bag body 1 and the bent portion 3 are made of a synthetic resin film or paper that cannot be thermally fused or is difficult to be thermally fused. When it is configured, it may be joined using an adhesive or the like instead of heat fusion. In each of the above embodiments, the communication hole 6 is formed from a small hole, but the communication hole 6 may be formed from a cut. In the first and second embodiments, the base-side superposed portion 3A of the bent portion 3 and the superposed portion 1A of the bag body 1 superposed thereon.
And an internal space 4 formed between opposed inner surfaces of the bent portion 3.
Are bonded by heat fusion while leaving a non-heat-fused portion (non-joined portion) that exposes an air passage 5 for communicating the outside with the outside. However, the present invention is not limited to this configuration. A non-heat-fused portion (non-joined portion) that exposes a ventilation path 5 for connecting the base-side overlapping portion 3A of the bent portion 3 to the outside of an internal space 4 formed between opposed inner surfaces of the bent portion 3 ) May be joined by heat fusion while leaving ().

[Brief description of the drawings]

FIG. 1 is a perspective view of a storage bag according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a perspective view of a storage bag according to a second embodiment of the present invention.

FIG. 6 is a horizontal partial sectional view of a main part.

FIG. 7 is a partial perspective view of a storage bag according to a third embodiment of the present invention.

FIG. 8 is a horizontal sectional view of a main part omitted in the middle.

FIG. 9 is a longitudinal cross-sectional view of a storage bag according to a fourth embodiment of the present invention, with a middle portion omitted.

FIG. 10 is a perspective view of a storage bag according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view of a storage bag according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag 1A Overlapping part 2 Storage space 3 Bending part 3A Proximal side overlapping part 4 Internal space 5 Air passage 6 Communication hole F film

Claims (4)

[Claims] 1. A flexible bend formed in a part of a bag body, which is opened on the outer surface side of the bag body and which enters the storage space in a bent state, and a base-side overlapping portion of the bent part is formed. And joining the internal space formed between the opposing inner surfaces of the bent portion while leaving a non-joining portion that exposes an air passage for communicating with the outside. The storage space and the internal space are connected to the bent portion. A storage bag having a communication hole for communicating with the storage bag. 2. The storage bag according to claim 1, wherein the bent portion is formed by folding a part of the bag body toward the storage space. 3. The bag according to claim 1, wherein the bent portion is formed separately from the bag body, and a base-side superposed portion is interposed between the superposed portions of the bag body to be joined. Storage bag. 4. The bag body is a heat-fusible synthetic resin film formed in a tubular shape, and the bent portion is formed by folding a part of the tubular film into the storage space side. The storage bag according to claim 1, which is formed.