JPH0379265B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention can be used as a disposable water pillow, a simple cold-warming device in which the bag body is filled with a jelly or gel-like ice pack, and a portable urinary device. This is a non-return method, in which a bag body is formed by heat-sealing a soft synthetic resin sheet, and a check valve is installed to prevent backflow of liquid injected into the bag body. This invention relates to a bag with a stop valve and a method for manufacturing the same.

[Conventional technology]

Traditionally, bags used for simple water pillows were
The one described in Japanese Patent No. 60-81528 is known.

In this conventional method, a long tubular body made of thin soft synthetic resin is formed, and this tubular body is cut as appropriate.
A tubular body of an appropriate length is formed, and its lower end is heat-sealed, and the other part is heat-sealed leaving an opening at the upper end to form a bag, and then a part is exposed through the opening. A bag with an injection valve is created by inserting a flat pipe-shaped injection valve into the bag, which is made by heat-sealing the edges of two thin synthetic resin sheets in the longitudinal direction, and then heat-sealing the injection valve and the bag body. was being formed. The bag formed as described above is a bag with a check valve, which has a function of preventing the backflow of liquid in the bag because when water is poured from the injection valve, the flat facing thin sheets forming the injection valve come into close contact with each other. This is the result.

In addition, as another conventional technique, the one disclosed in Japanese Utility Model Application Publication No. 61-79080 is known, but this conventional structure is
Similar to the conventional structure, the bag body and check valve are formed separately, and a pipe-shaped check valve is attached to the opening of the bag body, but the check valve has been improved. be. 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 an intermediate position of the width of the V-shaped sheet, and there are four check valves connected downwardly to the injection port. It has an outlet formed therein. Then, using this check valve, a bag is formed by stacking two approximately circular sheets with a tongue piece formed in the check valve insertion opening, leaving an opening and heat-sealing the outer periphery, and inserting a pipe into the opening. After inserting the shaped check valve, the two are attached by heat fusion to form a bag with a check valve.

[Problem to be solved by the invention]

Both bags with check valves of the conventional structure described above are manufactured by leaving an opening and heat-sealing the bag body, and then separately heat-sealing the bag to form a pipe-shaped bag with a backflow prevention function. The disadvantage of this method is that it is difficult to continuously produce it because the stop valve and stop valve are formed separately without being related to each other's manufacturing processes, and the process of inserting the pipe into the opening of the bag after completion is already completed. It was hot.

Furthermore, in the former bag, the check valve is simply formed from a pipe made by heat-sealing the side edges of two sheets, which has the disadvantage that a large amount of air also gets in when liquid is injected. Since the lower end side outlet is the same as the inlet and relatively wide, there is a drawback that a sufficient function to prevent 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, it has the disadvantage 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 enables efficient continuous production of bags with check valves, and also allows for relatively smooth injection while preventing air from entering the bag when liquid is injected, and also provides a good backflow prevention function. The purpose is to provide a bag with a stop valve.

[Means to solve the problem]

The method for manufacturing a bag with a check valve according to the present invention to achieve the above object is comprised of a combination of a bag body forming step, a check valve forming step, and a valve assembly step, as well as the following [A] It has the configuration described in ~[d].

[B] In the bag forming step, a thin soft synthetic resin bag forming sheet is folded in half and the ends are polymerized, and an opening is left at the end to serve as a liquid injection port. , heat-seal the outer periphery of the bag.

[B] In the check valve forming step, a check valve forming sheet made of a thin soft synthetic resin is folded into a W-shape, and at least a four-fold portion of the sheet is folded,
After heat-sealing a large number of parts at small intervals in a direction perpendicular to the folding direction, the outer folded edge part of the four-folded part is cut along the outer folded edge to form a center part. A large number of small holes are formed between the inverted V-shaped intermediate sheet and the outer sheets facing each other on both sides thereof, which communicate with the space between the folded portions of the sheet and the interior space of the bag.

[C] In the valve assembly step, the check valve formed in the check valve forming step is formed into a bag so that its small hole is located at a position corresponding to the inside of the bag from the opening of the bag. Place it on the inside surface of the sheet for
In this state, the outer surface of the upper end side of the check valve is heat-sealed to the inner surface of the bag-forming sheet facing thereto.

[d] After the check valve is formed in the check valve forming step, the bag body forming step is performed through the valve assembling step.

In addition, the bag with a check valve has a check valve made of a cylindrical body made of a thin soft synthetic resin sheet attached to the inner upper part of the bag body made of a thin soft synthetic resin sheet, and also has a check valve made of a cylindrical body made of a thin soft synthetic resin sheet. It has the configurations described in (a) to (d).

[B] The check valve is composed of an intermediate sheet whose width in the direction along the bag opening is the same as that of the bag body, and outer sheets located on both sides of the intermediate sheet.

[B] The intermediate sheet is formed into an inverted V-shape that is folded in half so that the intermediate portion protrudes upward in cross-sectional view, and the outer sheet is formed into a flat plate shape and extends upwardly from the intermediate sheet. It has been extended to

[C] Both pieces of the inverted V-shaped intermediate sheet folded in half and the outer sheet located on both sides thereof have a large number of holes at small intervals in the bag width direction in the overlapping parts. By heat fusion,
A large number of small holes are formed that communicate with the opening at the top of the bag and the interior space of the bag.

[d] The check valve is fixed to the opening of the bag body near the upper edge of the outer sheet.

Further, superabsorbent resin powder can be enclosed within the bag.

Furthermore, a urine absorbent may be enclosed within the bag.

[Effect]

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, and then folded into a W-shape. Cut the outer folded edge portion of the four-folded portion along the folded edge. As a result of this cutting, the initially single sheet has now become three sheets, the elongated inverted V-shaped intermediate sheet and the outer sheets on both sides, with their edges aligned, and both the inverted V-shaped intermediate sheet and The bag has a structure in which a large number of small holes are formed between the outer sheets, which communicate with the space between the two upper sheets and the bag interior space.

Then, a thin bag-forming sheet made of soft synthetic resin is polymerized from both outsides of the W-shaped sheet made up of three sheets, and the pair of bag-forming sheets and W-shaped sheet are respectively attached to the top of the bag. Attach one side of the W-shaped sheet to one side of the bag-forming sheet by heat-sealing the entire edge along the W-shaped sheet, and
Attach the other side of the letter-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 outer periphery of the bag is heat-sealed together with the W-shaped sheet, leaving an opening at the top, and the check valve is opened. Form an attached bag.

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.
Air accumulates above the liquid level within the bag-shaped check valve, and only liquid flows into the bag through the small hole at the bottom.

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 allowed to flow 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. The more external pressure is applied to the bag, the stronger the adhesion becomes, so even if a large external pressure is applied, the liquid will not flow back. Moreover, this check valve is formed in a W-shape when viewed in cross section, and liquid can enter between the inverted V-shaped seats below and apply internal pressure.
Even if the small holes of the letter-shaped check valve are provided on both sides of the inverted V-shaped sheet, a good backflow prevention function is exhibited.

〔Example〕

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

FIG. 1 shows a flowchart of a manufacturing apparatus for bag A with a check valve. The method for manufacturing the bag A with a check valve includes a combination of a bag body forming step, a check valve forming step, and a valve assembling step. A thin soft synthetic resin sheet 2 is intermittently pulled out at predetermined intervals by a roller 3 driven by a step motor (not shown), and is folded by a sheet folding means 4 as shown in FIG. two guide rods 6 disposed in the center where the guide plate 5 and the sheet 2 pass;
6, the sheet 2 is folded into a W-shape while being guided.

Creases are then formed by heating/cooling rollers 7 and 8, and an electric heating device 9 heats the W-shaped folded portion at numerous locations at small intervals in a direction perpendicular to the folding direction. fuse. As shown in FIG. 3, this electric heating device 9 is constructed by inserting a thin thermal insulator 10 having a thickness of 0.1 to 1.0 mm into a recess formed in a W-shaped bent portion, and then inserting upper and lower heating elements 11,
11, it is configured to be able to heat-seal a large number of linear locations in a direction perpendicular to the feed direction at small intervals in the feed width direction.

Next, the W-shaped sheet 2 with the four-folded portions heat-sealed is sent to the cutting device 12, where the two outer folded edge portions of the four-folded portion are cut along the outer folded edges. . As a result of this cutting, the single sheet 2 is reduced to a long and narrow inverted V-shaped intermediate sheet 2a, outer sheets 2b on both sides thereof,
It is divided into three sheets 2c and 2c, and the lower edges of these three sheets 2a, 2b, 2c are aligned and are heat-sealed in a large number in the sheet feeding direction.
The structure is such that a large number of small holes 13, 13 communicating inside and outside are formed both between the inverted V-shaped intermediate sheet 2a and the two outer sheets 2b, 2c.

In the valve assembly step, a roll 15 wound with a relatively wide thin sheet 14 made of soft synthetic resin is disposed on the lower side of the device part used in the step of forming the check valve 32. The W-shaped sheet 2 is placed on top of the sheet 14 so that the upper edge of the W-shaped sheet 2 almost coincides with the upper edge of the sheet 14 pulled out from the roll 15. As shown in FIG.
Sheet 14 is guided between sheet 8 and sheet 1.
4 so that the lower edge 19 almost coincides with the upper edge 20,
It is folded in two with the W-shaped sheet 2 sandwiched therebetween. Then, on the downstream side of the conveyance, the outer sheet 2 of the W-shaped sheet 2 is
b, 2c Open the upper end side and put a pair of front and back sheets 2
b, 14a and 2c, 14b are heat-sealed by the second electric heating device 22 over the entire feed width direction, and one side 2b of the W-shaped sheet 2 is attached to the upper edge of one of the folded sheets 14. and the other 2c of the W-shaped sheet 2 are attached to the other part of the sheet 14, respectively.

After that, in the bag forming step, the heating/cooling rolls 23 and 24 form a crease on the lower end of the folded sheet 14, and the rollers 2
3 and 24, the air between the sheets is released, and the W-shaped sheet 2 and the folded sheets 14a and 14b are brought into close contact with each other. Then, the third electric heating device 25 heat-seals the portions 26 in the direction perpendicular to the sheet feeding direction at an interval corresponding to the bag width L, and the opening 2 which becomes the liquid injection port.
7 is left, and a portion 28 near the upper end is heat-sealed. Finally, a second cutting device 30 cuts the center 29 of the heat-sealed portion 26 in a direction perpendicular to the sheet feeding direction.
Bags A are manufactured one after another by cutting or making perforations.

FIG. 6 is a front view of the bag A with a check valve manufactured by the above process, and FIG. 7 is a cross-sectional view thereof. Laminated layers, sheet thickness 50
It is composed of a thin soft synthetic resin film of ~150 μm. The bag 31 may have an outer surface made of paper and a waterproof layer such as polyethylene on the inner surface. The sheet 2 forming the inner bag-shaped check valve 32 is made of a thin synthetic resin film made of polyethylene with a thickness of about 50 μm.

However, when a faucet is inserted into the opening 27 of the bag A with a check valve and an appropriate amount is injected into the bag-like check valve 32, water accumulates inside the bag-like check valve 32, and the numerous small holes 13 at the bottom , 13 into the bag body 31. When inserting a faucet or pouring water, the bag-shaped check valve 3
Air enters into the bag body 31, but the air that enters is above the liquid level in the check valve 32, and does not enter the bag body 31 through the small hole 1.
Only water flows in from 3 and 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, and the check valve 3
All the water in the bag body 31 is caused to flow into the bag body 31, and both the sheets 2b and 2c are brought into close contact with each other to close the small holes 13 and 13. In this state, the bag body 31 is in an inflated state as shown in Fig. 9, and since the inverted V-shaped sheet 2a and the two outer sheets 2b and 2c are in close contact with each other, water will not flow back even if external pressure is applied. I never go out. In particular, in the closed small holes 13, 13, water enters the recess 33 of the inverted V-shaped intermediate sheet 2a, and the more external pressure is applied, the more the internal pressure of the water in the recess 33 and the surrounding water increases. Therefore, sheets 2a, 2b and 2
The adhesion between b and 2c becomes stronger, and a good backflow prevention function is exhibited.

[Another example]

In the above embodiment, the sheet 2 wound around the roll 1 shown in FIG. 1 was made of a synthetic resin film with a thickness of about 50 μm as a whole, but a thick film with a thickness of 150 μm was used near both ends of the wound sheet in the width direction. Alternatively, a male part with a fastener 34 formed on one side and a female part on the other side may be used in the thick part along the winding direction.

Further, a female fastener piece having a female part formed along a belt-like sheet having a thickness of about 100 μm and a male fastener piece having a male part formed along a belt-like sheet are each folded by the first bending means shown in FIG. The sheet 2 is attached by heat fusion along the edge of the sheet 2 in the pre-process of step 4, or during the heat fusion process using the second electric heating device 22, or before the heat fusion process using the third electric heating device 25. It's okay.

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

The third electric heating device 25 heat-seals the portions 26 in the direction perpendicular to the sheet feeding direction at intervals corresponding to the bag width, and leaves an opening 27 serving as a liquid injection port to form a thick wall at the upper end. Heat-seal the parts (heat-seal the fastener parts other than the openings as well).

Then, as shown in FIG. 10, the cutting device 30 cuts the bag in a substantially U-shape as shown by the imaginary line 36 in pitches of the bag width L, with the tongue piece 35 formed at the opening 27, as shown in FIG. A cold pack or urine absorbent made of water-absorbing resin is put into the bag body 31 from the mouth, and after the feeding process using the water-absorbing resin feeding device 37,
A fourth electric heating device 38 closes the bottom.

The ice pack is a super water-absorbing resin powder having a water absorbency of 200 to 800 times to 1000 times, such as known acrylic acid-based water-absorbing resins, isobutylene-maleic anhydride-based copolymer-based water-absorbing resins, Examples include PVA-based water-absorbing resins and polyvinyl alcohol maleate ester copolymers. When this super-absorbent resin powder is sealed, the bag 31 becomes jelly or gel-like when water is poured, 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 body 31. In this case, it is convenient as a portable urination tool.

The heat-sealed portion 39 for forming the small holes 13 by the first electric heating device 9 is an inverted V-shaped intermediate sheet 2a.
Only a part of the lower edge may be used, or the outer sheet 2b, beyond the upper edge of the inverted V-shaped intermediate sheet 2a,
A part of 2c may also be heat-sealed together.

In addition, when the upper edges of the sheets 2b and 14a and 2c and 14b are heat-sealed along the feeding direction by the second electric heating device 22, the upper edges of the sheets 2b and 14a and 2c and 14b are also fused or fused in the direction perpendicular to the feeding direction at the bag width L pitch. It may be temporarily fused.

Further, the bag body 31 was formed by folding the sheet 14 of the roll 15 in half, but by disposing half-width sheet rolls above and below the W-shaped sheet 2, the process using the second folding means 16 was omitted. Good too.

〔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 superposes three sheets, an inverted V-shaped intermediate sheet and outer sheets on both sides thereof, and heats the bag in the width direction. Even though it is formed by fusing, one sheet is used and folded into a W shape, and the four-folded portion is heat-sealed, and then the outside of the four-folded portion is folded back. Since the check valve is formed by cutting a portion along its outer folded edge, there is no need to align the sheets, there is no misalignment, and the gap between the small holes can be made small, so the check valve has a good backflow prevention function. It has the advantage that it can be formed extremely easily.

Also, instead of using the conventional method of forming the bag body and check valve (pipe) separately, inserting each check valve into the bag body, and fusing them together, which is a complicated process. The width of the check valve is formed to be the same as the width of the bag body, and the sheet forming the check valve and the sheet forming the bag body are simultaneously heat-sealed, and the check valve is placed inside the bag body. Since the check valve and the bag body are formed at the same time in the same position, the process is simplified and it is possible to continuously manufacture bags with a check valve.

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, since the air remains on the liquid level of the bag-shaped check valve, it is possible to prevent the air from flowing into the storage space for the ice pack or the like inside 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 at the part where the inverted V-shaped intermediate sheet at the bottom and the outer sheets located on both sides overlap. A large number of small holes are formed between the inverted V-shaped intermediate sheet and the outer sheets located on both sides of the intermediate sheet, so even though the check valve is as large as the inside of the bag, Since the small holes can be made extremely small with a small pitch, the sheet that closes the small holes is restrained by the heat-sealed portion and becomes difficult to open, thereby providing a good backflow prevention function. Moreover, although each small hole is 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 a sufficient area can be obtained as a flow path area. This has the advantage that the fluid flows smoothly into the bag body from the check valve, and the liquid injection operation can be performed quickly.

In addition, if the superabsorbent resin powder is sealed in the bag, it becomes jelly or gel-like when water is poured, and it has good cold retention by freezing after pouring water, so that the bag 31 will not be damaged. There are also few.

In addition, if you enclose a crushing pipe and a urine absorbent such as powdered activated carbon for deodorization inside the bag,
It is convenient to use the bag as a portable urination tool.

[Brief explanation of drawings]

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 cross-sectional view taken along the line X-X in Figure 6, Figure 8 is a cross-sectional view taken along the Y-Y arrow in Figure 6, Figure 9 is a cross-sectional view with liquid injected, and Figure 10 is a cross-sectional view taken along the line Y-Y in Figure 6. 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 intermediate sheet, 13...Small hole,
27...Opening, 31...Bag body, 32...Check valve.

Claims (1)

[Claims] 1 Consists of a combination of a bag body forming process, a check valve forming process, and a valve assembling process, and
A method for manufacturing a bag with a check valve having the configurations described in [A] to [D] below. [B] In the bag forming step, the thin soft synthetic resin bag forming sheets 14a and 14b are folded in half and the ends are polymerized, and an opening is formed at the end to serve as a liquid injection port. Leaving 27, bag body 3
The outer circumference of 1 is heat-sealed. [B] In the check valve forming step, the check valve forming sheet 2 made of thin soft synthetic resin is folded into a W-shape, and at least the quarter-folded portion of the sheet 2 is folded into a small shape in a direction orthogonal to the folding direction. After heat-sealing a large number of parts at intervals, the outer folded edge part of the four-folded part is cut along the outer folded edge to form an inverted V-shaped intermediate sheet 2a in the center. A large number of small holes 13, 13 communicating with the space between the folded portions of the sheet 2 and the interior space of the bag body 31 are formed between the outer sheets 2b, 2c located opposite to each other on both outer sides thereof. [C] In the valve assembly step, the check valve 32 formed in the check valve forming step is inserted into its small hole 1.
The check valve 32 is placed on the inner surface of the bag forming sheets 14a and 14b so that the portions 3 and 13 are located on the inner side of the bag than the opening 27 of the bag 31, and in this state, the check valve 32 is opened. The bag forming sheets 14a and 14b whose upper end side outer surfaces face the bag body forming sheets 14a and 14b
heat fused to the inner surface of the [D] After forming the check valve 32 in the check valve forming step, the bag forming step is performed through the valve assembling step. 2 Thin soft synthetic resin sheets 14a, 14b
A check valve 32 made of a cylindrical body of a thin soft synthetic resin sheet 2 is attached to the inner upper part of the bag body 31 made of A bag with a check valve. [B] The check valve 32 is composed of an intermediate sheet 2a having the same width as the bag body 31 in the direction along the bag opening 27, and outer sheets 2b and 2c located on both outer sides of the intermediate sheet 2a. has been done. [B] The intermediate sheet 2a is formed into an inverted V-shape which is folded in half so that the intermediate portion protrudes upward in cross-sectional view, and the outer sheets 2b and 2c are formed into flat plate shapes. It extends upward from 2a. [C] Both pieces of the inverted V-shaped intermediate sheet 2a folded in half and the outer sheets 2b and 2c located on both sides thereof are separated by a small interval in the bag width direction at the parts where they overlap with each other. The opening 27 at the top of the bag body 31 is formed by heat-sealing at multiple locations.
A large number of small holes 1 communicate with the inner space of the bag body 31.
3 and 13 are formed. [d] The check valve 32 is connected to the outer seat 2b,
It is fixed to the opening 27 of the bag 31 near the upper edge of the bag 2c. 3. The bag with a check valve according to claim 2, wherein superabsorbent resin powder is enclosed in the bag body 31. 4. The bag with a check valve according to claim 2, wherein a urine absorbent is enclosed in the bag body 31.