JPH09290840A - Synthetic resin bag body with check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a synthetic resin bag body equipped with a check valve that can certainly shut up a passage with an ordinary bag-making machine without allowing film at the trunk part of the bag body to be extended in a length longer than a specified one. SOLUTION: Two sheets of beltlike film 6a are placed in parallel with a zip fastener 5 at a place below the zip fastener 5 provided between two sheets of trunk part film 1a constituting a bag body 1 equipped with the zip fastener 5, and both ends of the beltlkie films are stuck together with side seals 2 of the bag body 1, and the upper end in the breadthwise direction of the beltlike films 6a is stuck by sealing 7 in parallel with the zip fastener 5 to the inside of the trunk part films 1a with a non-stuck part 8 serving as a vent provided at a part, and vertical sealings 9a, 9b extending along the entire length in the lengthwise direction at the non-stuck part 8 of the beltlike films 6a and intersecting the sealing 7 are provided for sticking to the inside of the trunk part film on one side. Then, a passage is formed between the vertical sealings 9a, 9b, and the two beltlike films 6a, 6b at the passage are pressed together by internal and external pressure of the bag body 1 and thereby a valve plate 10a for closing the passage 8a is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag made of synthetic resin with a check valve, which is suitable for containing a fluid such as liquid or powder.

[0002]

2. Description of the Related Art In order to surely prevent liquid contained in a bag made of synthetic resin with a chuck from leaking from an opening, a check valve provided with a check valve which is closed by an internal pressure below a chuck in the bag is provided. A bag is provided in Japanese Utility Model Publication No. 62-87036.

[0003] In this conventional sealed bag, a flat bag is formed in a state in which two body films each having a chuck formed are back-to-back with the chuck being on the outside, and the bags are opposed to each other. The opening edge is bent into the bag body so as to face the chuck so as to engage, and both side edges of two inscribed pieces, which are extensions of the body film bent into the bag body, are bonded together with the side seal of the bag body, This is a structure in which a sealing valve portion capable of opening and closing the intermediate portion is formed by heat sealing with one side of the bag except for the intermediate portion of the two lower inscribed pieces.

[0004]

In the above-mentioned conventional bag, two opposing opening edges of the body film are formed by bending opposing opening edges of the bag into the bag to form a sealing valve portion. It is an absolute requirement to construct the pieces. Therefore, the length of the body film forming the bag body in the vertical direction requires an extra length that is bent into the bag body and includes the size of the inscribed piece, resulting in an increase in cost.

[0005] Further, a flat bag is formed in a state where the two body films on which the chucks are formed are back-to-back with the chucks facing outward, and the opposed opening edges of the bags are sealed in the bag. However, if the bending position of the two body films is varied, this is reflected in the facing position of the chuck, and the facing position of the chuck is varied vertically.
There is a problem that causes poor occlusion.

Therefore, in terms of production, a special device for accurately bending the two body films and a control of the folding accuracy are required so that the bending positions of the two body films do not vary.

It is an object of the present invention to prevent the body film of the bag body from extending beyond a predetermined length in a normal bag making apparatus,
It is possible to manufacture a synthetic resin bag body with a check valve that reliably seals the flow path.

[0008]

The structure of the present invention for achieving the above object is made of a synthetic resin which is composed of two body films which face each other and has a male and female bite type chuck provided inside the opening. In the bag body, two strip-shaped films are interposed below the chuck between the two body films in parallel with the chuck to bond both ends together with side seals of the bag body. The upper ends of the two strip-shaped films in the lateral width direction are provided on the inner surface of the non-adhesive part, which is partially used as a flow port, and sealed and sealed in parallel with the chuck to form the two strip-shaped films of the non-adhesive part. A longitudinal seal intersecting the sealing seal over the entire length in the longitudinal direction of the two strip-shaped films is formed on one inner surface of the two body films to form a flow path communicating with the circulation port and the bag body, Two strip-shaped fibers in the flow path Beam is characterized in that it has a valve plate which closes the flow path by pressure contact with each other by the inner external pressure of the bag.

Further, in the above structure, the lower ends of the two strip-shaped films are located in the middle of the one body film on the side where the two strip-shaped films of the non-adhesive portion are adhered by the vertical seal. It is characterized in that the other strip-shaped film on the outside is made longer than the length of one strip-shaped film.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a synthetic resin bag body composed of two facing body films 1a and 1b. This bag 1 has a side seal 2 and a bottom seal 3
It is a bag body of the type of a bottom opening seal which is formed by and has an opening 12 at the upper end. 5 is an opening 12
Is a chuck formed in the vicinity of. Although not shown, the present invention is also applicable to a top-sealed bottom-open type bag in which the opening 12 is sealed and the bottom is opened.

According to the present invention, in the bag body 1, two strip-shaped films 6a and 6b are interposed below the chuck 5 between the two body films 1a and 1b in parallel with the chuck 5 and both ends thereof are inserted. It adheres together with the side seal 2 of the bag body 1.

Further, as shown in FIGS. 3 and 4, the upper ends of the two strip-shaped films 6a and 6b in the widthwise direction are partly provided on the inner surfaces of the two body films 1a and 1b. A non-adhesive portion 8 is provided and a sealing seal 7 is provided in parallel with the chuck 5, and the two strip-shaped films 6a and 6b of the non-adhesive portion 8 are attached to one of the two body films 1a and 1b. Two strip-shaped films 6a on the inner surface of the partial film 1b,
6b is provided over the entire length in the vertical width direction, and vertical seals 9a and 9b intersecting with the sealing seal 7 are formed to form a flow path 8a communicating with the flow port of the non-adhesive portion 8 and the bag body 1. The valve plate 1 for closing the flow path 8a by pressing the two strip-shaped films 6a, 6b of 8a against each other by the inner and outer pressures of the bag body 1
This is a configuration in which 0a and 10b are formed.

In the illustrated example, the vertical seals 9a and 9b are two, but one vertical seal is brought close to one of the left and right side seals 2 and a non-adhesive portion is not formed between the vertical seals 9a and 9b. It is also possible to provide 8 and use the strip films 6a and 6b between one vertical seal and the side seal 2 as the valve plates 10a and 10b.

Further, according to the present invention, the lower ends 6c and 6d of the two strip-shaped films 6a and 6b are attached to the vertical seals 9a and 9b.
The two strip-shaped films 6a, 6b of the non-adhesive portion 8
A configuration in which the other strip-shaped film 6a on the outer side is longer than the length of the one strip-shaped film 6b positioned in the middle with respect to the one body film 1b on the side where the is bonded by H dimension as clearly shown in FIG. Is.

In the above structure, as shown in FIG.
The valve plates 10a and 10b forming the flow paths 8a of the strip films 6a and 6b are pressed against each other by the internal pressure of the fluid such as the liquid or powder or granules enclosed therein and are caused to flow by the internal pressure of the bag body 1. The passage 8a is closed and the circulation port of the non-adhesive portion 8 is sealed.
The valve plates 10a and 10b are pressed against each other by the external pressure of the bag body 1 to close the flow path 8a.

The valve plate 10a has a structure in which the outer band-shaped film 6a on the outer side is made longer by the H dimension as shown in FIG. 3 than the length of one band-shaped film 6b of the two band-shaped films 6a and 6b. , 10b are pressed against each other to close the flow path 8a, as shown in FIGS. 4 and 5, the lower end 6c of the other strip-shaped film 6a wraps around the lower end 6d of the one strip-shaped film 6b,
The passage 8a is more reliably sealed.

When the fluid is put into or taken out of the bag body 1, for example, by inserting the nozzle 13 into the non-adhesive portion 8, the valve plates 10a and 10b are forcibly separated from each other and the fluid is put in and taken out through the nozzle 13. To do.

Further, according to the present invention, as shown in FIGS. 6 and 7, the bottom gusset 4 folded into a W-shape in the bottom portion 11 of the bag body 1 can be self-standing by folding the bottom gusset 4 together with the bottom seal 3 and the side seal 2. It is also applicable to various types of bags 1A.
In the bag body 1A of the self-supporting type shown in FIGS. 6 and 7, as described above, one vertical seal 9 approaches one of the left and right side seals 2 and the space between the one side seal 2 and The non-adhesive portion 8 is provided on the valve plate 10a, the strip films 6a and 6b between the vertical seal 9 and the side seal 2.
This is an example of the configuration of 10b.

The strip-shaped films 6a, 6b of the non-adhesive portion 8
Since the vertical seals 9a and 9b are provided over the entire length in the vertical direction, it is possible to suppress the fluid flowing into the vicinity of the non-adhesive portion 8 and to ensure the valve action of the strip films 6a and 6b by 10a and 10b. The vertical seals 9a and 9b play a clue over the entire length when the fluid is taken in and out without using the nozzle 13.

Therefore, according to the present invention, the strip film 6 is used.
To form the valve plates 10a and 10b by a and 6b,
In the bag-making process, two running body films 1a,
The strip-shaped films 6a and 6b are continuously inserted at predetermined positions between 1b, and the side seal 2 and the bottom seal 3 (or the ceiling seal) are performed by a well-known general bag-making machine with the chuck 5 engaged. In addition, since the check valve is formed by the sealing seal 7 and the vertical seals 9, 9a, 9b before and after the bag manufacturing process, the bag manufacturing process does not require a special device. It can also be incorporated into. There is no occurrence of the problem of poor occlusion such that the facing position of the chuck 5 varies vertically.

Further, the strip-shaped films 6a, 6b are heat-adhesive single-layer or multi-layer films, and the body films 1a, 1b.
Any film can be used as long as it can be thermally bonded to the inner surface of the bag film, and is not limited to the same material as the bag film as in the related art. Therefore, a material suitable for the purpose can be selected. And
Unlike the related art, it is not necessary to fold the length of the body film forming the bag body in the longitudinal direction into the bag body to have an extra length in which the dimensions of the inscribed pieces are added, thereby reducing costs. .

[0022]

As described above, according to the present invention, a synthetic resin bag body with a check valve can be continuously produced by a conventional bag making machine, and the body film of the bag body can be manufactured to a predetermined size. It has an effect that it can be provided at a low cost without extending the length.

Further, the lower ends 6c, 6 of the two strip-shaped films
The length of the other strip-shaped film on the outer side is made longer than the length of the one strip-shaped film positioned in the middle with respect to the one body-side film on the side where the two strip-shaped films of the non-adhesive portion 8 are bonded by the vertical seal. With this configuration, in the state where the valve plates are pressed against each other to close the flow path, the lower end 6c of the other strip film is lower than the lower end 6d of the one strip film.
There is an advantage that the flow path is sealed more surely by wrapping it so as to cover it.

Further, since the lengthwise direction of the strip-shaped film of the non-adhesive portion is vertically sealed over the entire length, fluids that enter the vicinity of the non-adhesive portion are suppressed, and the valve action of the valve plate of the strip-shaped film is ensured. Not only that, the vertical seal portion plays a role as a clue over the entire length when the fluid is taken in and out without using the nozzle.

[Brief description of drawings]

FIG. 1 is a front view of a bag of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is a sectional view of the bag body of the present invention in a state in which the check valve is operating.

FIG. 6 is a front view of a bag body to which the present invention is applied to a bag body of a self-supporting type.

FIG. 7 is a sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1 Bag 1a Body film 1b Body film 2 Side seal 3 Bottom seal 4 Bottom gusset 5 Chuck 6a Band film 6b Band film 6c Bottom of band film 6d Bottom of band film 7 Sealing seal 8 Non-adhesive part 8a Channel 9 Vertical Seal 9a Vertical seal 9b Vertical seal 10 Valve plate 10a Valve plate 10b Valve plate 12 Opening

Claims (2)

[Claims] 1. Comprising two body films facing each other,
In a bag made of synthetic resin in which a male and female bite type chuck is provided inside the opening, two strip-shaped films are interposed below the chuck between the two body films in parallel with the chuck and both ends are inserted. Is adhered together with the side seal of the bag body, and a non-adhesive portion having an upper end in the width direction of the two strip-shaped films and a non-adhesive portion partially serving as a flow port is provided on the inner surfaces of the two body films and is parallel to the chuck Then, the two band-shaped films of the non-adhesive portion are provided on one inner surface of the two body films with a vertical seal crossing the lengthwise direction of the two band-shaped films over the entire length. To form a flow path that communicates with the flow port and the bag body, and the two strip-shaped films of the flow path form a valve plate that closes the flow path by press-contacting each other by the internal and external pressures of the bag body. Characteristic synthetic resin with check valve Bag-making body. 2. The lower ends of the two strip-shaped films of one strip-shaped film positioned in the middle with respect to the one body film on the side to which the two strip-shaped films of the non-adhesive portion are adhered by the vertical seal. The synthetic resin bag body with a check valve according to claim 1, wherein the other strip-shaped film on the outside is made longer than the length.