JPH01240451A - Bag with non-return valve and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a bag having a non-return valve having excellent anti- backflow features by a method wherein a bag body is formed by heat-welding a plasticized synthetic resin sheet and a non-return valve of a bag shape is made in the bag body. CONSTITUTION:A plasticized synthetic resin sheet 5 is guided and folded into a W-shape between a bending guide 5 and two guide shafts 6, 6. Many portions on a part folded in a W-shape are heat-welded at small intervals by an electric heater 9, and cut along with an outer folded edge to form numerous small holes 13, 13 between a sheet 2a in an inverse V-shape and both outer sheets 2b, 2c. One of the end 2b of the W-shaped sheet 2 is attached to one of the upper ends of a two-folded sheet 14, and the other end 2c of the W-shaped sheet is attached to the other end of the sheet 14 by heat-fusing, respectively. Although air enters from an opening 27 while water is poured, the air remains above the liquid surface in a non-return valve 32 and only water enters a bag body 31 from the small holes 13, 13. After flowing the entire water in the non- return valve 32 into the bag body 31, the small holes 13, 13 are closed by sealing both sheets 2b, 2c.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention can be used as a disposable water pillow, a simple cold-insulating mixture whose main body is filled with a jelly or gel-like cold pack, and a portable urinary device. A bag with a back-up valve is formed by heat-sealing a soft synthetic sheet to form a bag body, and a bag-shaped check valve that has a valve function to prevent backflow of liquid injected into the bag body. and its manufacturing method.

[Conventional technology]

Conventionally, bags used for simple water pillows were made in 1983.
The one described in Japanese Patent No. 1528 is known.

This conventional method involves forming a long tubular body made of thin soft synthetic resin, cutting this tubular body appropriately to obtain a tubular body of an appropriate length, heat-sealing the lower end, and opening the upper end. A bag body is formed by heat-sealing the remaining parts, and then a flat pipe is formed by heat-sealing both edges of two thin synthetic resin sheets in the longitudinal direction with a part exposed through the opening. A bag with an injection valve is formed by inserting a shaped injection valve into the bag and then heat-sealing the injection valve and the bag.

The bag formed as described above is a bag with a back-up valve, which has a function of preventing the backflow of liquid in the bag by having flat opposing thin sheets that form the injection valve come into close contact when water is poured from the injection valve. This is the result.

Further, as another prior art, the one disclosed in Japanese Utility Model Application No. 61-79080 is known, but this conventional structure, like the above-mentioned conventional structure, has a bag body and a check valve formed separately. A pipe-shaped check valve is attached to the opening of the body, and it is an improved version of the check valve.

This check valve is made by folding a narrow sheet in half, stacking the narrow sheets on both sides of the inverted V-shaped sheet with their lower edges aligned, and heat-sealing both sides. A pipe-shaped check valve is formed by vertically heat-sealing each folded sheet portion of the inverted V-shaped sheet and the outer sheet at the middle position of the width of the V-shaped sheet. It has an outlet formed therein. Then, using this check valve, a substantially circular 2
A bag body is formed by stacking two sheets, leaving an opening and heat-sealing the outer periphery, inserting a pipe-shaped check valve into the opening, and then attaching both sheets by heat-sealing to form a bag with a check valve. Ru.

[Problem to be solved by the invention]

Both bags with check valves of the conventional structure described above are manufactured using a pipe-shaped check valve that exhibits a backflow prevention function and is formed by separately heat-sealing the bag body, which is heat-sealed with an opening left. The drawbacks were that they were formed separately and that a process of inserting a pipe into the opening of the bag made it difficult to produce them continuously.

Furthermore, in the former bag, the check valve is simply formed from a pipe with both side edges of two sheets heat-sealed, which has the disadvantage that a large amount of air gets in when liquid is injected.
Furthermore, since the lower end outlet is the same as the inlet and relatively wide, there is a drawback that a sufficient function of preventing backflow cannot be expected.

In addition, since the latter bag has a divided outlet at the lower end of the check valve, the opening width of the outlet can be made narrower than the former bag, so the backflow prevention function is somewhat improved compared to the former bag. Since the check valve is pipe-shaped, there is a drawback that, like the former, the injected liquid does not stay in the pipe (check valve) and immediately enters the bag together with the air that has entered.

Another drawback is that the outflow port is relatively narrow, so it takes time for the liquid to flow out, and if the pipe is made larger and the outflow port is enlarged to deal with this, another drawback arises: the backflow prevention function deteriorates. .

The present invention provides a manufacturing method that allows continuous production of bags with a check valve, and also provides a check valve that allows liquid to be poured relatively smoothly while preventing air from entering the bag when liquid is injected, and that exhibits a good backflow prevention function. The purpose is to provide an attached bag.

[Means to solve the problem]

The bag with a check valve of the present invention is produced by forming a thin soft synthetic resin sheet for forming a bag-shaped check valve and a thin soft synthetic resin sheet for forming a bag body according to the following steps a and b. Manufactured.

a. Fold the sheet for forming a check valve into a W shape, heat-seal at least the four-folded portion of the sheet at a number of locations at small intervals in a direction perpendicular to the folding direction, and then Cut the outer folded edge portion along the outer folded edge to form a central inverted V-shaped sheet and an outer sheet, and cut the cut edge portion along the cutting line on both sides of the inverted V-shaped sheet. forming a large number of small holes that communicate with the two-folded portion of the sheet along the line; b. facing the bag-forming sheet from both outside sides of the check-valve-forming sheet to the four-folded portion of the check-valve-forming sheet; Polymerization is performed with the end side of the bag body forming sheet located on the end side, and each pair of bag body forming sheet and check valve forming sheet is heated over at least the entire length of the end side. After fusing, both sheets are superimposed to form an outer periphery of the bag, leaving an opening on the end side that will serve as a liquid inlet for the check valve, and integrating the check valve forming sheet and the bag body forming sheet to form the outer periphery of the bag body. The process of heat-sealing parts.

In addition, the technical means taken for the bag with a check valve of the present invention is that a check valve made of a thin soft synthetic resin sheet is attached to the inner upper part of the bag body made of a thin soft synthetic resin sheet. The bag is equipped with a stop valve, and the check valve has the same width as the bag body, and is composed of an inverted V-shaped sheet below and seats located on both sides of the inverted V-shaped sheet, and At the portion where the sheets located on both outer sides overlap, an upper opening is formed between the inverted V-shaped sheet and the sheets located on both outer sides by heat fusion at multiple locations spaced at small intervals in the bag width direction. The point is that a large number of communicating small holes are formed, and the small holes and the openings are left in place to form a bag-like shape by heat fusion.

[For production]

The middle part of a thin soft synthetic resin sheet is folded into a W shape, and the four folded parts are heat-sealed at numerous points at small intervals in a direction perpendicular to the folding direction. Cut the outer folded edge portion of the folded portion along the folded edge. As a result of this cutting, the sheet, which was originally a slender inverted V-shaped sheet and both of its outer sheets, is now in a state where the edges are aligned, and between the inverted V-shaped sheet and both outer sheets. Both have a structure in which a large number of small holes communicating between the two upper sheets are formed.

Then, a thin bag-forming sheet made of soft synthetic resin is polymerized from both outsides of the W-shaped sheet consisting of three sheets, and the pair of bag-forming sheets and the W-shaped sheet are connected to each other at the ends that will become the upper part of the bag. Attach one side of the W-shaped sheet to one side of the bag-forming sheet by heat-sealing the entire W-shaped sheet along the W-shaped sheet.
Attach the other side of the shaped sheet to the other side of the bag-forming sheet. After that, with both sheets forming the bag in close contact with each other, the bag forming sheets are heat-sealed together with the W-shaped sheet at the outer periphery of the bag, leaving an opening at the top to form a bag with a check valve. form.

When a liquid such as tap water is injected into the bag with a check valve formed as above through the opening at the top, the liquid accumulates inside the bag-shaped check valve inside and the liquid flows into the bag through the small hole at the bottom end. do. When liquid is injected into the bag check valve, air also enters the liquid, but the air accumulates above the liquid level inside the bag check valve, and only liquid enters the bag through the small hole at the bottom. will flow in.

When a predetermined amount of liquid has been injected, the injection is stopped and before all the liquid in the bag-shaped check valve has entered the bag, press the front and back sheets at the top of the bag and press the inside of the bag-shaped check valve. The air is discharged from the upper opening, and the liquid inside the bag-shaped check valve is completely flowed into the bag body, and the W-shaped sheets forming the check valve are brought into close contact with each other to close the small hole.

Then, the sheets forming the check valve are held in close contact with each other by the internal pressure of the fluid that has entered the bag, and the liquid inside the bag does not flow backwards and spout to the outside.

When external pressure is applied to the bag body, the adhesion force becomes ridiculously large, so even if a large external pressure is applied, the liquid will not flow back. Moreover, this check valve is formed with a W-shaped cross section, and since liquid enters between the lower inverted V-shaped seats and internal pressure is applied, the small hole of the W-shaped check valve becomes inverted V-shaped. Even when provided on both sides of a shaped sheet, it exhibits a good backflow prevention function.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a flowchart of a manufacturing apparatus for a bag with a check valve (A). A thin soft synthetic resin sheet (2) wound around a roll (1) is intermittently pulled out at predetermined intervals by a roller (3) driven by a step motor (not shown), and the sheet bending means ( 4), two guide rods (6), (6) are arranged in the center where the bending guide plate (5) and sheet (2) pass, as shown in Figure 2.
The sheet (2) is folded into a W shape while being guided between the two.

Creases are then formed by heating/cooling rollers (7) and (8), and an electric heating device (9) is used to heat the W-shaped folded portion at numerous locations at small intervals in a direction perpendicular to the folding direction. Heat fused.

This electric heating device (9) has a temperature of 0.1 to 1 as shown in FIG.
With the thin thermal insulator (10) with a thickness of 0.0 mm inserted into the recess formed in the W-shaped bent part, the upper and lower heat generators (10) are inserted.
1), (11) and (11), the structure is such that heat-sealing can be performed at a large number of linear locations in a direction perpendicular to the feed direction at small intervals in the feed width direction.

Next, the four-folded portion is heat-sealed to form a W-shaped sheet ) (
2) is sent to a cutting device (12) where the two outer folded edge portions of the four-fold section are cut along their outer folded edges. By this cutting, the single sheet (2) is divided into three sheets: the elongated inverted V-shaped sheet (2a) and the two outer sheets (2b) and (2c). (2a),,(
2b), (2C) have a structure in which many of them are heat-sealed in the sheet feeding direction with the lower edges aligned, creating an inverted V-shaped sheet.
(2a) and its outer sheets (2b), (2c)
Numerous small holes (13), (1
3) is formed.

On the lower side, there is a roll (15) wound with a relatively wide and thin sheet 1- (14) made of soft synthetic resin.
is arranged, and the W-shaped sheet (2) is placed in a state where the upper edge of the W-shaped sheet (2) is almost aligned with the upper part of the sheet (14) pulled out from the roll (15). )
The second folding means (1
6), the bending guide plate (1
7) and a guide rod (18) disposed in the center where the sheet (14) passes, while the sheet (14) is guided, the lower edge (19) of the sheet (14) touches the upper edge (20). The W-shaped sheet (2) is sandwiched and folded in half so that they almost match.

Then, the outer sheet (2b) of the W-shaped sheet (2) is moved by the guide member (21) on the lower side of the conveyance.

(2C) A pair of front and back sheets with the top end open (2b).

The upper edges of (14a), (2c), and (14b) are heat-sealed over the entire feed width direction by the second electric heating device (22), and attached to the upper edge of one of the folded sheets (14). W
One side (2b) of the W-shaped sheet (2) is attached to the other portion of the sheet (14), and the other (2C) of the W-shaped sheet (2) is attached to the other portion of the sheet (14), respectively.

After that, the heating/cooling rollers (23) and (24) create a crease at the bottom end of the folded sheet (14), and the pressure from the rollers (23) and (24) creates a crease between the sheets. Release the air and make a W-shaped sheet (
2) and folded sheets (14a), (14b
) to bring them into close contact with each other. Then, the third electric heating device (25
), the area (26) in the direction perpendicular to the sheet feeding direction is heat-sealed at a distance that corresponds to the width of the bag (increased bag width), and the area (26) near the upper end is left, leaving an opening (27) that will serve as a liquid inlet. The location (28) is heat fused. Finally, the center (29
) is cut by a second cutting device (30) or perforated to produce bags (A) one after another in a continuous manner.

Figure 6 shows a bag with a check valve (A) manufactured by the above process.
The front view of the sheet (14
) The bag body (31) is made of nylon with a polyethylene layer laminated on the inner surface, and has a sheet thickness of 50 to 150 μm.
It is made of a thin soft synthetic resin film.

The bag (31) may have an outer surface made of paper and an inner surface coated with a waterproof layer such as polyethylene. The sheet (2) forming the inner bag-shaped check valve (32) has a thickness of approximately 50 mm.
It is constructed from a thin synthetic resin film made of μm polyethylene.

However, when a faucet is inserted into the opening (27) of the bag with a check valve (^) and an appropriate amount is poured into the bag-like check valve (32), water accumulates inside the bag-like check valve (32) and , water flows into the bag body (31) from the numerous small holes (13), (13) in the lower part. When inserting a faucet or pouring water, do not use the bag check valve (3
2) Air enters the inside, but the air that enters is blocked by the check valve (3).
There is a small hole (1) above the liquid level in the bag (31).
3), Only water flows in from (13), no air enters. When a considerable amount of water is poured, the water supply is stopped and the seats (2b) and (2C) forming the check valve (32) are pressed down to exhaust air from the opening (27). ) All the water in the bag body (31) is allowed to flow into the bag body (31), and both sheets (2b) and (2C) are brought into close contact with each other, and the small holes (13) and
(13) is occluded. In this state, the bag body (31) is in an inflated state as shown in Fig. 9, and the inverted V-shaped sheet (2a) and its outer two sheets (2b), (
2c) Since they are in close contact with each other, water will not flow back and escape even if external pressure is applied. In particular, occluded ostia (13
), (13) are the recesses (3) of the inverted V-shaped sheet (2a).
3) The more water enters the interior, and the more external pressure is applied, the more the recess (
33) Seat (2a
), (2b), (2b), and (2c) have stronger adhesion to each other and exhibit a good backflow prevention function.

[Another example]

In the above example, the sheet (2) wound around the roll (1) in FIG. 1 was a synthetic resin film with a thickness of approximately 50 μm as a whole, but the widthwise ends of the wound sheet had a thickness of 150 μm.
A thick-walled one with a thickness of m may be used, and a male part forming a fastener (34) on one side and a female part on the other side may be used in the thick-walled part along the winding direction. You can.

In addition, a female fastener piece with a female part formed along a belt-like sheet having a thickness of about 100 μm and a male fastener piece with a male part formed along a belt-like sheet were respectively attached to the first part shown in FIG.
The third electric heating device (22) is used before the bending means (4) or during the heat fusion step using the second electric heating device (22)
It may be attached by heat fusion along the edge of the sheet (2) in a step prior to the heat fusion step 5).

Further, the steps after the step using the third electric heating device (25) may be performed as follows.

A third electric heating device (25) is used at a location (26) in a direction perpendicular to the sheet feeding direction at an interval corresponding to the bag width.
At the same time, the thick part of the upper end is heat-sealed, leaving an opening (27) that will serve as a liquid injection port (a portion of the fastener other than the opening is also heat-sealed).

Then, as shown in FIG. 10, the cutting device (30) is used to form the tongue pieces (35) at the opening (27) portion, and cut the tongue pieces (35) into a substantially U-shape as shown by the imaginary line (36) at a pitch of the bag width (L). A cold pack or urine absorbent made of water-absorbing resin is placed into the bag body (31) through the cut opening at the bottom, and after the feeding process using the water-absorbing resin feeding device (37), a fourth Close the bottom with an electric heating device (38).

The ice pack is a super absorbent resin powder having a water absorbency of 200 to 800 to 1000 times, such as known acrylic acid-based water-absorbing resins, inbutylene-maleic anhydride-based copolymer-based water-absorbing resins, etc. , PVA-based water-absorbing resin, polyvinyl alcohol maleic acid ester copolymer, and the like. By enclosing this super-absorbent resin powder, the bag body (31) becomes jelly or gel-like by pouring water, and by freezing after pouring water, the bag body (31) is less likely to be damaged.

Further, a urine absorbent made by mixing the super absorbent resin with a crushing pipe and powdered activated carbon for deodorization may be enclosed in the bag (31). In this case, it is convenient as a portable urination tool.

The heat-sealed portion (39) for forming the small hole (13) by the first electric heating device (9) may be only a part of the lower edge of the inverted V-shaped sheet (2a), or the inverted V-shaped sheet (2a)
Beyond the above state, some of the sheets (2b) and (2c) may also be heat-sealed together.

Also, the sheets (2b), (14a), (2c), and (14b) are heated along the feeding direction by the second electric heating device (22).
) may also be fused or temporarily fused in a direction perpendicular to the transport direction at a pitch of bag width (L).

Furthermore, the bag body (31) is a sheet (14) of a roll (15).
Although it is formed by folding the sheet in half, it is also possible to arrange half-width sheet rolls above and below the W-shaped sheet (2) and omit the step using the second folding means (16).

〔Effect of the invention〕

According to the method of manufacturing a bag with a check valve according to the present invention, the small hole of the check valve is formed between a sheet having an inverted V shape and sheets on both sides thereof.
Although it is formed by overlapping two sheets and heat-sealing them in the width direction of the bag, one sheet is used, folded into a W shape, and the folded four-fold portion is heat-sealed. After that, the outer folded part of the four-folded part was formed by cutting along the outer folded edge, so there is no need to align the sheets with each other, there is no misalignment, and the gap between the small holes can be made small to prevent backflow. There is an advantage that a check valve with a good prevention function can be formed very easily. In addition, instead of forming the bag body and the check valve (pipe) separately as in the conventional method, and adopting the complicated process of individually inserting the check valve into the bag body and fusing them together, The width of the check valve is formed to be the same width as the bag body, and the sheet that will become the check valve and the sheet that forms the bag body are simultaneously heat-sealed, and the check valve is positioned inside the bag body. Since the check valve and the bag body are formed at the same time, the process is simplified and bags with check valves can be manufactured continuously.

Furthermore, in the bag with a check valve according to the present invention, since the check valve is formed into a large bag having the same width as the bag body, air may enter the bag-shaped check valve when liquid is injected. However, air accumulates above the liquid level in the bag check valve.

Therefore, air does not flow into the bag. Therefore, since excess air does not enter, the bag does not inflate too much when a predetermined amount of liquid is injected, which is advantageous in terms of strength.

In addition, the check valve is made by heat-sealing a large number of points at small intervals in the bag width direction in the part where the inverted V-shaped sheet at the bottom and the sheets located on both sides of the check valve overlap.
Since a large number of small holes are formed both between the letter-shaped sheet and the sheets located on both sides of the sheet, even though the check valve has the same width as the inside of the bag, the small holes Since the sheet can be made extremely small with a small pitch, the sheet that closes the small hole is restrained by the heat-sealed portion and becomes difficult to open, and has a good backflow prevention function. Moreover, even though the small holes are small, there are many small holes formed across the entire width of the bag on both sides of the lower edge of the inverted V shape, so fluid flows smoothly from the check valve into the bag body. It has the advantage that liquid injection can be performed quickly.

[Brief explanation of the drawing]

The drawings show an embodiment of the bag with a check valve of the present invention and its manufacturing method, with FIG. 1 being a flowchart showing the manufacturing process, FIG. 2 being a schematic perspective view showing sheet folding means, and FIG. 3 being an electric heating A schematic diagram of the device; FIG. 4 is a schematic perspective view showing the means for folding the bag-forming sheet; FIG. 5 is a plan view showing the heat-sealed portion; FIG. 6 is a front view of the bag with a check valve; The figure is a longitudinal sectional view taken along the X-X arrow in FIG. 6, FIG. 8 is a cross-sectional view taken along the Y-Y arrow in FIG. 6, FIG. The figure is a plan view showing the sheet cutting position, FIG. 11 is a front view showing another embodiment, and FIG. 12 is a partial vertical sectional view showing the main part. (2), (2b), (2c), (14a), (
14b) ---" sheet, (2a) --- Inverted V-shaped sheet, (13) --- Small hole, (27) ---
...Opening, (31)...Bag body, (32)...
····non-return valve.

Claims (1)

[Claims] 1. A thin soft synthetic resin sheet (2) for forming a bag-shaped check valve (32) and thin soft synthetic resin sheets (14a) and (14b) for forming a bag body (31) are used to form the following a. A method for manufacturing a bag with a check valve, which is formed in the order of the steps of , b, a. Folding the sheet (2) for forming a check valve into a W shape, and folding at least a four-fold portion of the sheet (2) in a direction perpendicular to the folding direction. After heat-sealing a large number of parts at small intervals in the direction, the outer folded edge part of the four-folded part is cut along the outer folded edge to form an inverted V in the center.
A letter-shaped sheet (2a) and outer sheets (2b), (2c) are formed, and an inverted V-shaped sheet (2a) at the cut edge portion thereof is formed.
a step of forming a large number of small holes (13), (13) communicating with the folded portion of the sheet (2) along the cutting line on both sides of the sheet (2), b. The end side of the bag body forming sheet (14a), (14b) is located on the end side facing the four-fold part of the check valve forming sheet (2). After polymerizing the bag body forming sheet (14a), (14b) and the check valve forming sheet (2) together over at least the entire length of the end portion thereof, , both sheets (2), (14a), and (14b) are polymerized to form a check valve forming sheet (2), leaving an opening (27) on the end side that serves as a liquid inlet for the check valve (32). and the bag body forming sheets (14a), (14b) are integrally formed into a bag body (31).
) The process of heat-sealing the outer periphery of the 2. Thin soft synthetic resin sheets (14a), (14b)
) A bag with a check valve is provided with a check valve (32) made of a thin soft synthetic resin sheet (2) attached to the inner upper part of a bag body (31) made of The width is the same as the bag body (31), and there is an inverted V downward.
A letter-shaped sheet (2a) and sheets located on both sides of it (2a)
b) and (2c), and the inverted V-shaped sheet (2a
) and the sheets (2b) and (2c) located on both outsides of the sheet (2b) and (2c) are superimposed, and the inverted V-shaped sheet (2a) and its both sides are bonded by heat fusion at multiple locations spaced apart from each other in the width direction of the bag. Upper openings (27) on both sides between outer seats
A large number of small holes (13), (13) are formed which communicate with the small holes (13), (13) and the opening (27).
A bag with a check valve that is formed into a bag shape by heat-sealing. 3. The bag with a check valve according to claim 2, wherein superabsorbent resin powder is enclosed within the bag body (31). 4. The bag with a check valve according to claim 2, wherein a urine absorbent is enclosed within the bag body (31).