JPH09290841A - Synthetic resin bag body with check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly shut up a passage with an ordinary bag-making machine without allowing film at the trunk part of a bag body to be extended in a length longer than a specified one. SOLUTION: A zip fastener tape 5a with a zip fastener 5 formed thereon is connected to two sheets of beltlike film 6a, and the two beltlike films 6a are interposed between two sheets of trunk part film 1a constituting a bag body 1, and both ends of the beltlike films are stuck together with side seals 2 of the bag body 1 and furthermore the breadthwise parts on the opening side of the two beltlike films 6a are stuck to the inside of the opposite two trunk part films 1a. On the other hand, the breadthwise parts of the two beltlike films 6a on a part lower than the zip fastener 5 are stuck in parallel with the zip fastener 5 by sealing 7 to the inside of the two trunk part films 1a with a non-stuck part 8 serving as a vent provided at a part, and vertical sealings 9a, 9b are provided, 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, and a passage is formed between the vertical sealings 9a, 9b. The two beltlike films 6a 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.

An object of the present invention is to make it possible to manufacture a synthetic resin bag body with a check valve without extending the body film of the bag body by a normal bag making apparatus beyond a predetermined length.

[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, a zipper tape in which the chuck is formed is extended on two strip-shaped films, and the two strip-shaped films are interposed between the two body films so that both ends are provided with side seals of the bag body. Adhering and adhering to the inner surfaces of the two body films that are in contact with each other in the lateral direction on the opening side of the two band films, on the other hand, in the lateral width direction below the chuck of the two band films. Is provided on a part of the inner surface of the two body films with a non-adhesive portion serving as a flow port, and sealed and sealed in parallel with the chuck. The sealing sea over the entire length A valve that closes the flow path by forming a flow path that communicates with the flow port and the bag body by applying a vertical seal that intersects with each other, and the two strip-shaped films of the flow path are pressed against each other by the internal and external pressures of the bag body. It is characterized in that a plate is formed.

[0009] Further, in a bag made of synthetic resin, which is composed of two body films facing each other and provided with a male and female bite type chuck inside the opening, a zipper tape in which the zipper is formed on two strip films. And the zipper tape protrudes from the opening edge of the bag between the two body films to interpose the two strip-shaped films, and both ends thereof are bonded together with side seals of the bag, A non-adhesive portion is provided on the inner surface of the two body films in the lateral width direction of the two strip films below the chuck, and a non-adhesive portion is partially provided as a flow port to seal and seal in parallel with the chuck. A vertical seal intersecting the sealing seal over the entire length in the lengthwise direction of the two strip-shaped films of the non-adhesive part is formed to form a flow path communicating with the flow opening and the bag body, and the two strip-shaped films of the flow path are formed. Film bag It 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.

Further, in such a synthetic resin bag body with a check valve, a non-adhesive portion is provided on the inner surfaces of the two body films, the non-adhesive portion partially serving as a flow port in the lateral width direction below the chuck. Two strip-shaped films sealed in parallel with the chuck were crossed with the seal-seal over the entire length in the lengthwise direction of the non-adhesive portion of the two strip-shaped films on one inner surface of the two body films. A vertical seal is formed to form a flow path that communicates with the circulation port and the inside of the bag, and the lower ends of the two strip-shaped films form a non-adhesive part by the vertical seal.
From the length of the one strip-shaped film located in the middle with respect to the one body film on the side where the strip-shaped films are adhered,
The other strip-shaped film on the outer side is lengthened, and the two strip-shaped films of the flow channel are pressed against each other by the internal and external pressures of the bag body to form a valve plate for closing the flow channel.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. In FIGS. 1 and 2, reference numeral 1 denotes a synthetic resin bag body composed of two facing body films 1a and 1b. The bag 1 is a bag of a bottom-opening bottom seal type which is formed by a side seal 2 and a bottom seal 3 and has an opening 12 at the upper end. Reference numeral 5 denotes a chuck formed near the opening 12. 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. FIG.
Also, as shown in FIG. 7, a bottom gusset 4 folded in a W shape into the bottom portion 11 of the bag body 1 is folded together with the bottom seal 3 and the side seal 2 into the bottom gusset 4, and the bag body 1 of a self-supporting type is provided.
The present invention is also applicable to A. Further, as shown in FIGS. 1 and 6, the opening 12 is formed so as to correspond to the planned tear line 15 which is lined in parallel with the chuck 5 above the chuck 5.
Notches 14 for opening the sealing portion are engraved on both sides (or one side). The notch 14 for opening the sealing part is not necessarily engraved, and a scissor mark and an explanation display "Please cut from here" may be provided at one end of the planned tear line 15. In addition, an open state that does not require cutting or cutting may be used.

In the first embodiment of the present invention, the zipper tapes 5a and 5b having the zipper 5 formed on the two strip-shaped films 6a and 6b are extended in the bags 1 and 1A, and
The two band-shaped films 6a and 6b are interposed between the body films 1a and 1b so that both ends thereof are side seals 2 of the bag body 1.
And the two strip-shaped films 6a, 6b
Of the two body films 1a and 1b that are opposed to each other in the lateral width direction on the opening side.

Further, the two body films 1a, 1
On the inner surface of b, a non-adhesive portion 8 is provided which partially serves as a flow port in the lateral width direction of the strip-shaped films 6a, 6b below the chuck 5, and a sealing seal 7 is provided in parallel with the chuck 5.
Then, a vertical seal 9 intersecting the sealing seal 7 is provided over the entire length of the strip-shaped films 6a, 6b of the non-adhesive portion 8 in the lengthwise direction so as to communicate with the flow passage 8a and the inside of the bag body 1.
To form two strip-shaped films 6a, 6 of the flow path 8a.
b is a structure in which the valve plates 10a and 10b are formed so as to be pressed against each other by the inner and outer pressures of the bags 1 and 1A to close the flow path 8a.

In the illustrated example, the vertical seals 9a and 9b are two, but one vertical seal 9 is brought close to one of the left and right side seals 2 and is not adhered to the one side seal 2. It is also possible to provide the portion 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.

In the first embodiment, 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 bag 1 due to the internal pressure of the fluid such as the liquid or powder or granules enclosed in the bag 1. Then, the flow path 8a is closed to seal the flow port of the non-adhesive portion 8. 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.

When a fluid is put in or taken out of the bags 1, 1A, for example, the nozzle 13 is inserted into the non-adhesive portion 8 so that the valve plates 10a, 10 of the strip films 6a, 6b are inserted.
b is forcibly separated and the fluid is taken in and out through the nozzle 13.

The strip 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.

8 to 11 show a second embodiment of the present invention. In FIGS. 8 and 9, reference numeral 1 is a bag made of synthetic resin, which is composed of two facing body films 1a and 1b. The bag 1 is a bag of a bottom-opening bottom seal type which is formed by a side seal 2 and a bottom seal 3 and has an opening 12 at the upper end. 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. 6 and 7
The second embodiment is also applicable to a bag body 1A of a type in which a bottom gusset 4 folded in a W shape into the bottom portion 11 of the bag body 1 is folded together with the bottom seal 3 and the side seal 2 as shown in FIG. To be done.

The second embodiment of the present invention is the above bag 1 (or 1).
In A), the zipper tapes 5a and 5b having the zipper 5 formed on the two strip films 6a and 6b are extended,
Between the two body films 1a and 1b, the zipper tapes 5a and 5b protrude from the opening edge of the bag body 1 (or 1A) to interpose the two strip films 6a and 6b, and both ends thereof. Is bonded together with the side seal 2 of the bag body 1 (or 1A).

The two body films 1a, 1
On the inner surface of b, a non-adhesive portion 8 having a flow port below the chuck 5 of the two strip-shaped films 6a and 6b is provided in part, and a sealing seal 7 is provided in parallel with the chuck 5. , The two strip-shaped films 6a, 6 of the non-adhesive part 8
Vertical seals 9a and 9b (or 9) that intersect the sealing seal 7 in the vertical width direction of b are formed to form a flow path 8a that communicates with the flow port and the bag body 1 (or 1A).
The two strip-shaped films 6a and 6b of the flow path 8a are the bag 1
(Or 1A) internal and external pressures press-contact each other and the flow path 8
This is a configuration in which valve plates 10a and 10b for closing a are formed.

The operation and effect of this second embodiment are the same as those of the first embodiment.

12 to 14 show a third embodiment of the present invention. The third embodiment is basically the same as the first and second embodiments. The difference from the first and second embodiments is that a non-adhesive portion 8 is formed on the inner surfaces of the two body films 1a and 1b in the lateral width direction below the chuck 5 and partly as a flow port. Two strip-shaped films 6a, 6b provided and sealed in parallel with the chuck 5
On the inner surface of the one body film 1b of the two body films 1a and 1b along the entire length in the vertical width direction of the non-adhesive portion 8 of the two strip films 6a and 6b.
The vertical seals 9a and 9b intersecting with each other are provided to form a flow path 8a communicating with the flow port and the inside of the bag 1.

Then, the two strip-shaped films 6a, 6
One strip-shaped film whose lower end 6c, 6d is located intermediately with respect to one body film 1b on the side where the two strip-shaped films 6a, 6b of the non-bonded portion 8 are bonded by the vertical seals 9a, 9b. As shown in FIG. 12, the other strip-shaped film 6a on the outer side is longer than the length of 6b by the H dimension.

In the above structure, as shown in FIG. 14, one of the two strip-shaped films 6a and 6b is formed.
By the configuration in which the other strip-shaped film 6a on the outer side is longer than the length of b by the dimension H, the lower end 6c of the other strip-shaped film 6a is closed when the valve plates 10a and 10b are in pressure contact with each other to close the flow path 8a. One strip film 6
The lower end 6d of b is wrapped so as to cover the lower end 6d to further ensure the sealing of the flow path 8a.

The strip-shaped films 6a, 6b of the non-adhesive portion 8
The vertical seals 9a and 9b are provided over the entire length in the vertical width direction, which has the same meaning as in the first embodiment.

Therefore, in the above-described first to third embodiments of the present invention, the valve plates 10a, 6b are formed by the strip films 6a, 6b extending the zipper tapes 5a, 5b on which the chuck 5 is formed.
To form 10b, run 2 in the bag making process.
The band-shaped films 6a and 6b are continuously inserted at a predetermined position between the body films 1a and 1b, and the side seals 2 are formed by a well-known general bag-making machine with the chuck 5 engaged.
Since the bottom seal 3 (or the ceiling seal) is performed and the check valve is formed by the sealing seal 7 and the vertical seals 9, 9a, 9b before and after the bag manufacturing process, a special check valve is formed. It can be integrated into the bag making process without the need for equipment, and. There is no occurrence of the problem of poor occlusion such that the facing position of the chuck 5 varies vertically.

Further, the strip films 6a and 6b are heat-adhesive single-layer or multi-layer films, and the body films 1a and 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. .

[0028]

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 films are
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 longitudinal width direction of the strip-shaped film in 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 according to a first embodiment 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.

FIG. 8 is a front view of a bag body according to a second embodiment of the present invention.

9 is a sectional view taken along line EE of FIG.

10 is a sectional view taken along line FF in FIG.

11 is a cross-sectional view taken along the line GG of FIG.

FIG. 12 is a sectional view of a portion corresponding to line BB in FIG. 1, showing a third embodiment of the present invention.

FIG. 13 is a sectional view of a portion corresponding to line C-C in FIG. 1, showing a third embodiment of the present invention.

FIG. 14 is a cross-sectional view of the bag according to the third embodiment of the present invention in a state in which the check valve is operating.

[Explanation of symbols]

 1 bag 1a body film 1b body film 2 side seal 3 bottom seal 4 bottom gusset 5 chuck 5a chuck tape 5b chuck tape 6a strip film 6b strip film 6c strip film lower end 6d strip film lower end 7 sealing seal 8 non-adhesive Part 8a Flow path 9 Vertical seal 9a Vertical seal 9b Vertical seal 10 Valve plate 10a Valve plate 10b Valve plate 12 Opening part

Claims (3)

[Claims] 1. Comprising two body films facing each other,
In a bag made of synthetic resin having a male and female bite type chuck inside the opening, a zipper tape having the zipper formed on two strips of film is extended, and the zipper tape is sandwiched between the two body films. Two
Both ends are bonded together with the side seals of the bag body by interposing a band-shaped film, and bonded to each inner surface of the two body films that are in contact with each other in the lateral width direction on the opening side of the two band-shaped films, On the other hand, in the widthwise direction of the two strip-shaped films below the chuck, a non-adhesive portion that partially serves as a flow port is provided on the inner surface of the two body films to seal and seal in parallel with the chuck. , A non-adhesive portion is provided with a vertical seal that intersects the sealing seal over the entire length in the lengthwise direction of the strip-shaped film to form a flow path communicating with the flow opening and the bag body, 1. The synthetic resin bag body with a check valve, wherein the strip-shaped films of 1 above are pressed against each other by internal and external pressures of the bag body to form a valve plate for closing the flow path. 2. 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, a zipper tape having the zipper formed on two strips of film is extended, and the zipper is sandwiched between the two body films. The tape protrudes from the opening edge of the bag body and interposes the two band-shaped films, and both ends thereof are bonded together with the side seals of the bag body, and the two band-shaped films are attached to the inner surfaces of the two body films. A non-adhesive part that partially serves as a flow port in the lateral width direction below the chuck is provided and sealing is performed in parallel with the chuck, and the longitudinal width direction of the two strip-shaped films of the non-adhesive part is provided over the entire length. A vertical seal intersecting with the sealing seal is formed to form a flow path communicating with the flow port and the inside of the bag, and the two strip-shaped films of the flow path are pressed against each other by internal and external pressures of the bag to form the flow path. Valve plate to close A synthetic resin bag body with a check valve. 3. A non-adhesive portion having a flow port below the chuck and a part of which serves as a flow port on the inner surface of the two body films is sealed and sealed in parallel with the chuck.
A strip-shaped film is provided on one inner surface of the two body films with a vertical seal crossing the sealing seal over the entire length in the vertical width direction of the non-bonded portion of the two strip-shaped films, and the circulation port and the bag body. And a lower end of the two strip-shaped films is located in the middle with respect to one body film on the side where the two strip-shaped films of the non-adhesive portion are adhered by the vertical seal. The other strip-shaped film on the outer side is made longer than the length of the strip-shaped film, and the two strip-shaped films of the flow channel are pressed against each other by the internal and external pressures of the bag body to form a valve plate for closing the flow channel. The synthetic resin bag body with a check valve according to claim 1 or 2.