JPH11310251A - Air-permeable structure of bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-permeable structure of a bag which moisture hardly enter even the case where the bag is set on a moist place in a state that an air-permeable portion of the bag is directed downward. SOLUTION: The air-permeable structure of a bag A comprises folding film portions 2, 3 on both sides of a film on a central film portion 1 to seal the lower edges thereof, and integrally connecting inner faces of the opposed parts of the film portions 2, 3 on both the sides with a belt-like air-permeable material 4, such as an unwoven cloth, which is inserted between the film portions 2, 3. In this bag A, the side part 2a of the film portion 2 of one of the film portions 2, 3 is separated from the outer face of the air-permeable material 4, and this separated portion 2b is superposed on the side part 3b of the other film portion 3. Thus, since the portion between these opposed faces is formed into an air-permeating gap 5 communicating to the outer face side of the air- permeable material 4, the air-permeable material 4 is in a state that it is normally covered with the side part 2a of the film portion 2 of at least one of the film portions 2, 3 on both the sides. Accordingly, moisture does not enter the bag A through the air-permeable material 4 and, further, surplus air in the bag A can smoothly be evolved out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag ventilation structure for preventing water from entering the inside of a bag from an air vent for ventilation even when carelessly splashed with water.

[0002]

2. Description of the Related Art Conventionally, bags for storing small articles such as grains such as rice, red beans, and soybeans, or fertilizers or foods such as confectionery have been provided with extra bags contained in the bags when storing the articles. The ventilation part for bleeding air is formed. As such an air venting part, for example, a circular hole having a diameter smaller than the size of the article is formed at each of the four corners on one side of the bag, and the extra air in the bag that has entered when the article is stored from the circular hole. It has a structure to discharge.

However, when a bag is loaded with one side provided with the circular hole facing down, if the mounting surface of the bag is wet, water penetrates into the bag through the circular hole and is stored in the bag. There is a problem that the stored goods such as cereals are contaminated or corroded, thereby lowering the commercial value or making them unusable.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an object of the present invention is to provide a case where a bag is placed with a ventilation part downward in a place where water is present. However, it is another object of the present invention to provide a ventilation structure of a bag in which moisture hardly infiltrates into the bag.

[0005]

According to a first aspect of the present invention, there is provided a bag ventilation structure, wherein a film portion on both sides of a rectangular thermoplastic synthetic resin film has a central portion having a bag width. A bag formed by folding over a film portion, sealing a lower edge thereof, and integrally bonding inner surfaces of side portions of both side film portions facing each other to both side portions of a flexible band-shaped ventilation material over the entire length. Forming a coating portion coated with a ventilation material by overlapping a side end of at least one of the two film portions from a portion bonded to the ventilation material onto a side end of the other film portion; A ventilation gap is formed between the air gap and the ventilation material.

According to a second aspect of the present invention, there is provided the bag ventilation structure according to the first aspect, wherein the opposite side portions of the both side film portions are formed on both sides of the band-shaped ventilation material over the entire length. It is characterized in that the side end portions of both film portions are released from the bonded portion while being bonded, and are covered on the ventilation material in a state of being superposed on each other.

Further, according to a third aspect of the present invention, there is provided the bag ventilation structure according to the first or second aspect, wherein the opposite side portions of the both film portions are provided on both sides of the band-shaped ventilation material. The film is adhered over the entire length, and the side ends of the film portions on both sides are released from the adhered portion to cover the air-permeable material in a state of being overlapped with each other. It is characterized in that fusion is performed at intervals, and a ventilation gap is formed between vertically adjacent fusion parts.

[0008]

The bag is filled with a required amount of articles from the open end of the bag.
After storing, when the opening end of the bag is sealed, excess air is sealed in the bag together with the stored items. When this air presses the front and back of the bag and increases the air pressure inside the bag,
By the pressure, the side edges of the film covering the ventilation material are pushed through a band-shaped ventilation material such as a nonwoven fabric which integrally connects between the sides of the film portions on both sides forming one surface of the bag. The film is discharged to the outside through the ventilation gaps at the free ends that are overlapped with each other.

Further, when the bags are stacked with the one side provided with the ventilation material facing downward, even if moisture is present on the mounting surface, the ventilation material is formed by the side ends of the film portions on both sides as described above. Since it is covered, moisture is prevented from penetrating into the ventilation material side by the outer surface of the covering portion, and the stored contents in the bag are prevented from being contaminated by the moisture.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described with reference to the drawings. FIGS. 1 to 3 show a grain bag such as a rice bag, and a bag A has a vertical width. It is formed of a flexible thermoplastic film such as rectangular nylon or polyethylene having the same length as the vertical width of A and a horizontal width slightly longer than the peripheral length of the bag A. That is, the center film portion 1 of the thermoplastic film is made to have a width equal to the width of the rice bag A, and both side film portions 2 and 3 are folded while forming folds 14 and 15 on the back surface of the center film portion 1 to form The lower end edges of both side film portions 2 and 3 are thermally sealed to the lower end edge of central film portion 1 to seal 11, and the opposite ends 2a and 3a of both side film portions 2 and 3 (free ends). Side ends 2b and 3b are overlapped over the entire length, and in this state, the side portions 2
The inner surfaces of a and 3a are integrally connected by a ventilation material 4 such as a band-shaped nonwoven fabric having air permeability. Therefore, the front surface of the bag A is formed by the central film portion 1, the back surface of the rice bag A is formed by the film portions 2 and 3 on both sides, and the seal 11 side forms a bag A having a closed bottom surface and an open upper end.

The vertical width of the band-shaped ventilation material 4 is equal to the vertical width of the bag A, and the horizontal width thereof is the side end portion 2 of the film portions 2 and 3 on both sides.
It is formed wider than the width of the overlapping portion of b and 3b. The connection of the opposing sides 2a, 3a of the two film portions 2, 3 by the ventilation material 4 is performed by attaching the ventilation material 4 to the inner surface of the opposite sides 2a, 3a over the entire length. Sealing portions 12 and 13 are formed by fusing the opposite side portions 2a and 3a of both side film portions 2 and 3 to the outer surfaces of both side portions of the ventilation material 4 by a predetermined width over the entire length. This is formed by integrally connecting the ventilation material 4 and the film portions 2 and 3 on both sides (FIG. 4).
And FIG. 5).

Further, the side portions 2a of the film portions 2, 3 on both sides,
The width between the free ends of the seal portions 12 and 13 from the seal portions 12 and 13 in FIG. 3a is released from the ventilation material 4 and extended over the ventilation material 4 to cover the ventilation material 4 entirely and to cover these portions. The side end portions 2b and 3b of the film portions 2 and 3 are overlapped with each other to form a ventilation gap 5 that opens in the width direction of the back surface of the bag A between the overlapped inner and outer surfaces.
Through the gap 6 between the ventilation material 4 and the side portions 2a, 3a of the film portions 2, 3 which are separated from the outer surface of the ventilation material 4, and communicate with the outer surface of the ventilation material 4. The air in the bag A can be discharged to the outside through the airbag.

The side portions 2a and 3a of the film portions 2 and 3 superposed on the ventilation material 4 are fused 7 at appropriate intervals in the longitudinal direction of the ventilation material 4 so that The side part 2a of the one film part 2 superposed on the upper side is prevented from being turned up and exposing the ventilation material 4. The fusion part 7 is formed over the entire width of the ventilation material 4, but may be partially formed. The side portion 2a of the one film portion 2 superposed on the upper side is integrally fused at its lower end edge to the lower end edge of the central film portion 1 forming the surface of the bag A as described above. It is not always necessary to provide it because it can be prevented from being unexpectedly turned.

Next, the use state of the bag A thus configured will be described. First, the center film portion 1 forming the front and back surfaces of the bag A and the film portions 2 and 3 on both sides are separated from each other to open an upper end opening portion of the bag A. After filling and storing the cereal, the open end of the bag A is closed by superimposing the opposing surfaces of the upper edge portions of the central film portion 1 and the film portions 2 and 3 on both sides, and then the upper edge portions are heated together. Sealing is performed by fusing, and grains are stored and sealed in bag A.

As described above, the bag A filled with grains is filled with unnecessary air at the time of filling grains.
By pressing the front and back surfaces of the bag A, the extra air entering the bag A generates an internal pressure, and the air passes through the ventilation material 4 with the pressure, and the both-side film portions 2 released from the outer surface of the ventilation material 4, The air is discharged from the gap 6 between the side portions 2a and 3a of the third member 3 to the outside through the ventilation gap 5. At this time, the side portions 2a, 3a of the two film portions 2, 3 superimposed on the ventilation material 4
Is fused 7 at appropriate intervals in the length direction of the ventilation material 4, so that the side portions of the film portions 2, 3 covering the ventilation material 4 are not turned even by the discharge pressure of air. While maintaining the state in which the ventilation gap 5 is always opened in a direction along one side on the back surface of the bag A, the side portion 2a of the film portion 2 superposed on the upper side is inflated upward by air pressure to be opened. The air can be exhausted while increasing the size.

Further, as described above, the side portion 2a of one of the two film portions 2, 3 is overlapped on the side portion 3a of the other film portion 3 so that the ventilation material 4 is entirely covered. Since the film A is covered with the side portion 2a of the film portion 2, the bag A filled with the grain is placed on the back side, that is, on the floor or the like in a state where the bag 4 is laid sideways so that the ventilation material 4 faces downward. In the case where moisture is present on the floor surface, moisture does not come into direct contact with the ventilation material 4 and the film portions 2 and 3 covering the ventilation material 4 The side portions 2a and 3a reliably prevent moisture from infiltrating into the ventilation material 4 side, so that an unexpected situation in which the grain filled in the bag A is contaminated with moisture does not occur.

Moreover, the side ends 2b and 3b of the film portions 2 and 3 are overlapped with each other.
Is coated twice, so that it is possible to more reliably prevent moisture from entering the ventilation material 4 side.

Further, the side portions 2a, 3a of the film portions 2, 3 on both sides are integrally fused to the belt-shaped ventilation member 4 at appropriate intervals in the longitudinal direction of the bag A. The side portions 2a and 3a of the two-sided film portions 2 and 3 covering the ventilation material 4 are not turned up and the ventilation material 4 is not exposed. Side 2
It is in a state of being always covered by a and 3a, and as described above, it is possible to reliably prevent an unexpected situation such as intrusion of moisture into the bag A.

In the above embodiment, the ventilation material 4
Although a non-woven fabric is used, a net fabric, a permeable fabric, a porous sheet material having an infinite number of air holes, or the like may be employed. In short, the two film portions 2 and 3 are integrally connected by heat fusion. Thus, it is only necessary that air be passed between the inner and outer surfaces of the bag A but not pass through the stored items. Also,
Although the cereal bag has been described as the bag A, the bag A is not limited thereto, and may be used as a bag for storing fertilizer or a bag for storing foods such as confectionery.

[0020]

As described above, the ventilation structure of the bag according to the present invention is characterized in that the film portions on both sides of the rectangular thermoplastic synthetic resin film are folded on the central film portion having the bag width to seal the lower edge, and In a bag in which the inner surfaces of the side portions of both side film portions facing each other are integrally adhered to both side portions of a flexible band-shaped breathable material over the entire length, at least one side of the film portions of the above both side film portions An end portion is overlapped on the side end of the other film portion from the adhesive portion to the ventilation material to form a covering portion covered with the ventilation material, and a ventilation gap is formed between the covering portion and the ventilation material. Therefore, even when the bag is placed on the placement surface where moisture is present in a state where the one surface side on which the ventilation material is provided faces down, the band-shaped ventilation material has at least one of the film portions on both sides. On the side of the film It is possible to prevent water from coming into contact with the ventilation material without fail, and there is no danger of moisture entering the bag through the ventilation material. There is no unforeseen event that the stored items are contaminated with water or corroded.

Further, the ventilation material communicates with the outside through the ventilation gap formed between the mutually overlapped side ends of the film portions covering the ventilation material, so that the ventilation material is stored in the bag. Excess air that has entered when the object is filled can be smoothly discharged out of the rice bag through the ventilation material.

According to the second aspect of the present invention, the opposite side portions of both side film portions are bonded to both side portions of the band-shaped ventilation material over the entire length, and the side end portions of the both side film portions are bonded from this bonded portion. Is released and covered on the ventilation material in a state of being overlapped with each other, so that the ventilation gap side of the ventilation material is double covered by the side end portions of the film portions on both sides, and the ventilation material It is possible to more reliably prevent the water from coming into contact with the air and into the bag from the air-permeable material.

According to the third aspect of the present invention, the opposite side portions of both side film portions are bonded to both side portions of the band-shaped ventilation material over the entire length, and the side end portions of both side film portions are bonded from the bonded portion. It is separated and covered on the ventilation material in a state of being overlapped with each other, and this covering portion is fused to the ventilation material at appropriate intervals in the longitudinal direction of the bag, and a ventilation gap is provided between vertically adjacent fused portions. Is formed, so that the side portions of the film portions on both sides covering the ventilation material are not turned up, and the ventilation material is not inadvertently exposed. It can be covered by the side of the film portion, and it is possible to more reliably prevent the moisture from coming into contact with the ventilation material and infiltrating the bag from the ventilation material.

[Brief description of the drawings]

FIG. 1 is a partially cut-away simplified back view of a bag,

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

FIG. 3 is a cross-sectional view taken along the line II-II in FIG.

FIG. 4 is an enlarged cross-sectional view of a ventilation section.

FIG. 5 is a partially cutaway enlarged perspective view thereof.

[Explanation of symbols]

 A bag 1 Central film part 2, 3 Both-side film part 2a, 3a side part 2b, 3b side end part 4 Vent material 5 Ventilation gap 7 Fused part

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[Procedure amendment]

[Submission date] December 29, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (3)

[Claims] 1. A film formed by folding both sides of a rectangular thermoplastic synthetic resin film over a central film having a bag width to seal the lower edges and extending the inner surfaces of the sides of the opposite sides of the film to the entire length. In a bag integrally bonded to both sides of a flexible band-like ventilation material having flexibility, a side end of at least one of the film portions of the both-side film portions is separated from a bonding portion to the ventilation material to the other film portion. A ventilation structure for a bag, characterized in that it is formed on a covering portion which is covered with a ventilation material by being superposed on a side end of the bag, and a ventilation gap is formed between the covering portion and the ventilation material. 2. The opposite side portions of the both-sided film portions are bonded to both sides of the band-shaped ventilation material over the entire length, and the side end portions of the two-sided film portions are released from the bonded portion to form a pair on the ventilation material. The ventilation structure for a bag according to claim 1, wherein the bag is covered in an overlapping state. 3. The opposite side portions of the both-side film portions are bonded to both sides of the band-shaped ventilation material over the entire length, and the side end portions of the two-sided film portions are released from the bonded portion to form a pair on the ventilation material. It is characterized in that it is coated in an overlapped state, and this coated portion is fused to the ventilation material at appropriate intervals in the longitudinal direction of the bag, thereby forming a ventilation gap between vertically adjacent fused portions. The bag ventilation structure according to claim 1 or 2, wherein: