JP2002167726A - Water bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple water bag utilized by uniformly and quickly absorbing water without any leakage and deviation. SOLUTION: This water bag is provided with an inner bag and an outer bag, the inner bag is a hydrolytic or water soluble bag body and includes water absorbing resin powder body, and the outer bag is a bag body formed of a synthetic fiber cloth having a cover factor value of 1,000-1,600. This water bag is characterized in including a plurality of inner bags.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water sac used for preventing flooding at a flood disaster site or the like.

[0002]

2. Description of the Related Art Sandbags have hitherto been used to prevent disasters such as rupture of river embankments due to flooding, overflow or intrusion of earth and sand, embankment by rainwater, and collapse of cut slopes. As a conventional sandbag, a bag made of a fiber bag having a predetermined strength and size filled with earth and sand, and the inlet of the bag is tightly tied and used, is often used. For such sandbags, only bags are prepared in normal times, and when a disaster is expected or occurs, the bags are transported to the affected area, and the bags are filled with sand at the site, It is used for the stacking method after the sandbag is closed and the sandbag is made.

[0003]

However, in the event of a flood or the like, the problem of labor and time for forming sandbags as described above under bad weather conditions in the stricken area, and the problem of having to procure a large amount of sediment are also encountered. It was difficult to make a large amount of sandbags in the disaster area in a short time. As an alternative to the sandbag having such a problem, various types of waterbags using a water-absorbing resin have been proposed (for example, Japanese Utility Model Publication No. 6-49605). However, the water sac also has a problem that the water-absorbent resin particles and other fillers that are inclusions are liable to leak out during transportation, a problem that the inclusions are uneven, and that water is not uniformly absorbed when absorbing water,
There is a problem that slippage occurs when stacking the water-absorbed / expanded hydropouches. In addition, there is a problem that the structure is complicated to solve this problem and the cost is increased. The present invention has been made in view of such circumstances, and provides a water bag capable of absorbing water uniformly and promptly for use with a simple structure without leakage or deviation of inclusions. It is an issue.

[0004]

The present invention achieves the above object and has the following constitution. 1. A water bag having an inner bag and an outer bag, wherein the inner bag is a hydrolyzable or water-soluble bag, and contains water-absorbent resin particles, and the outer bag has a cover factor of 1,000 to 1600. A water bag comprising a bag made of synthetic fiber cloth having a certain value, and including a plurality of inner bags. 2. The above water bag, wherein a crimped yarn or an entangled yarn is used for the synthetic fiber cloth. 3. The water bag according to the above 1 or 2, wherein a non-slip processing is applied to a surface of the outer bag. 4. The water bag according to the above 1 or 2, wherein a cloth or a sheet having an anti-slip function is attached to a surface of the outer bag.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The water bag according to the present invention is composed of an inner bag containing water-absorbent resin particles and an outer bag containing a plurality of the inner bags. The water-absorbent resin particles are not particularly limited, but are usually made of a water-absorbent resin having a water absorption / water retention capacity of 10 times or more of its own weight, and the average particle diameter is preferably 50 to 1500 μm, and more preferably. Is 150-800
μm powder or particles are used. Average particle size of 50
If it is less than μm, the resin aggregates when absorbing water, resulting in a
The water absorption efficiency tends to decrease because the center cannot sufficiently absorb water, which is not preferable. Also 150
If it exceeds 0 μm, it takes a long time to absorb water, which is not preferable. Examples of the water-absorbing resin include starch-based, CMC-based, polyacrylate-based, saponified bi-vinegar-acrylate copolymer, saponified bi-maleic acid maleate copolymer, and isobutylene maleic anhydride. Copolymers, polyacrylonitrile-based, polyethylene oxide cross-linked, poly-N-vinylacetamide-based and the like.

[0006] The inner bag must be water-soluble or water-soluble. Examples of the material of such a water-disintegrable or water-soluble inner bag include a water-disintegrable pulp paper, or a water-soluble film made of starch, polyvinyl alcohol, or the like, but it does not dissolve outside after the water bag absorbs water. Water-disintegrable pulp paper is particularly preferred because it is inexpensive and easy to process. In the present invention, when the inner bag is hydrolyzable or water-soluble, when the water bag absorbs water, the water is sufficiently supplied to the water-absorbent resin particles contained in the inner bag,
Further, when the water-absorbent resin particles expand and absorb water, the inner bag is easily disintegrated, so that expansion of the water-absorbent resin particles and movement in the water bag are not hindered.

[0007] As the inclusion to be enclosed in the inner bag, a water-absorbent resin particle is indispensable, but in addition to the above, an ultraviolet absorber for preventing ultraviolet deterioration of the water-absorbent resin and an increase in apparent specific gravity of the water bag are included. May be included. The ultraviolet absorber is not particularly limited, but generally a substance having a chain initiation inhibitory action, a radical scavenging action or a peroxide decomposition action is used, and specifically, a benzotriazole compound, benzophenone Compounds, cyanoacrylate compounds, salicylate compounds, phenol compounds and sulfur-phosphorus compounds. The specific gravity adjusting material is not particularly limited, but a mineral material having a specific gravity of 3 to 4 or more and low toxicity is preferably used, and examples thereof include barite and barium sulfate.

As the outer bag, a bag made of synthetic fiber cloth is used. The synthetic fiber constituting the synthetic fiber cloth is not particularly limited, and can be appropriately selected depending on the use. Specifically, polyamide-based, polyvinyl alcohol-based, polyvinylidene chloride-based, polyvinyl chloride-based, polyester-based, polyacrylonitrile-based,
Polyethylene, polypropylene, polyurethane,
Synthetic fibers of polyaramid type, polyfluoroethylene type and the like can be mentioned. Naturally degradable synthetic fibers, for example, fibers made of aliphatic polyester such as polylactic acid can also be used. A synthetic fiber cloth formed using these synthetic fibers or short fibers may be used as a material for the outer bag.However, from the viewpoint of strength, durability and price, it is formed of polyester or polyamide long fibers. Woven fabrics are particularly preferably used. Further, in consideration of the disposability after use, it is preferable to use a woven fabric formed of naturally decomposable long fibers such as polylactic acid as a material for the outer bag. If a water-disintegrable pulp paper is used and a water-absorbent resin granule is selected and used as a water-absorbent resin particle, a water-decomposable sac can be obtained as a whole.

Also, it is possible to use a soaked yarn or a yarn-dyed yarn for all or a part of the synthetic fiber, so that not only can a color matching with the surrounding environment be selected, but also the weather resistance of the bag can be improved. Can be. In addition, you may dye after manufacturing a synthetic fiber fabric by weaving etc.

In the present invention, it is necessary that the cloth used for the outer bag has a cover factor value of 1000 to 1600, more preferably 1200 to 1400.
Here, the cover factor value (CF) in the present invention is a value represented by the following mathematical formula.

[0011]

(Equation 1)

If the above cover factor value is less than 1000, a large gap is formed between the structures of the fabric, so that the inclusions such as the water-absorbent resin particles easily leak from the outer bag after the water sac is absorbed. On the other hand, when the cover factor value exceeds 1600, it becomes difficult for water to pass therethrough, which hinders water absorption.

[0013] The water bag of the present invention is prepared by putting a plurality of water-absorbent resin particles and other inclusions into the above-mentioned inner bag and sealing them by sewing or bonding.
It is manufactured by putting a plurality of them in the above outer bag and then sealing the outer bag by sewing, usually, and has a double structure consisting of a plurality of inner bags and one outer bag. . The shape of the bag forming the inner bag or the outer bag is not particularly limited, and can be arbitrarily selected depending on its use, such as a tubular shape, a box shape, and a mat shape. In order to make the water-absorbent resin particles contained therein quickly and uniformly absorb water, it is desirable that the shape is not too thick. In addition, the number of inner bags to be included in one outer bag may be appropriately adjusted, but from the viewpoint of performance and productivity, 2 to 8, preferably 4 to 6 is preferable.

The water bag of the present invention has a relatively simple double structure as described above, and thus has a problem that occurs when the water-absorbent resin particles are directly enclosed in the outer bag, for example,
A problem that affects the performance, such as the water-absorbent resin particles agglomerating during water absorption to form a "dama", or the difficulty of filling a predetermined amount of water-absorbent resin particles into the bag during manufacturing. Surface problems are solved. In the sac of the present invention,
Since the water-absorbent resin particles and other inclusions are subdivided and enclosed in a water-disintegrable or water-soluble inner bag, the inclusions do not greatly bias during transportation etc. and do not leak out However, when water is absorbed, water is absorbed uniformly and promptly, and in addition, when the water-absorbent resin particles expand and absorb water, the inner bag is easily disintegrated. Can be spread over the entire water sac without obstruction of the flow. Furthermore, the cover factor of the fabric forming the outer bag is optimized, so that water absorption is not hindered, and the inclusions do not leak out after water absorption.

Generally, the water sac after water absorption and expansion tends to be rounded, and thus has a problem that the water sac may be slippery when piled up. Thereby, it is possible to make the water sac less slippery. One of such preferred embodiments is to use a crimped yarn or an entangled yarn for all or a part of the synthetic fibers constituting the synthetic fiber fabric of the outer bag. By using the crimped yarn or the entangled yarn, the frictional resistance of the outer bag surface increases, and the water bags become less likely to slip. It is also a preferable embodiment that the surface of the outer bag is subjected to non-slip processing, for example, resin processing such as dot coating.

Another preferred embodiment is that a cloth or a sheet having an anti-slip function is attached to the surface of the outer bag. Can be stacked. The cloth or sheet having a non-slip function is not particularly limited, and a cloth or a rubber sheet having a high frictional resistance may be used, but a hook-and-loop fastener is particularly preferable. When attaching the fabric or sheet having a non-slip function to the outer bag, the fabric or sheet may be attached to the outer bag surface in an island shape or a stripe shape by a method such as adhesion or sewing. In the case of mounting in a stripe shape, the direction of the stripe on one surface (upper surface) and the other surface (lower surface) may be the same, or the angle may be changed to a right angle or the like. When a hook-and-loop fastener is used, the effect of preventing slippage can be obtained only by attaching a male member of the hook-and-loop fastener to one surface, but it is more effective to attach a female member to the other surface.
In this case, the colors of the male and female materials should be changed so that the upper and lower surfaces of the water sac can be easily checked during the stacking work.However, in order to further save the labor during the work, the male and female materials are attached to both surfaces. May be mixed and attached.

[0017]

Next, the present invention will be described in detail with reference to examples. Example 1 A commercially available water-disintegratable pulp paper (dust paper for flush toilet) is woven in two, and the peripheral portion is sewn except one side serving as an opening to obtain a bag for an inner bag of 10 cm × 15 cm. Was. 50 g of a water-absorbent resin powder (manufactured by Sanyo Chemical Co., Ltd., JT-2) composed of an acrylic acid copolymer and having an average particle diameter of 400 μm was put into the bag, and the opening was sewn and sealed. Thus, an inner bag containing the water-absorbent resin particles was obtained. Separately, a polyester multifilament yarn (560 dtex / 96f) was used for the warp and the weft to fabricate a flat-textile woven fabric with a warp density and a weft density of 37 yarns / 2.54 cm. This woven fabric was cut into a length of 84 cm x 61 cm, then folded in two, and the periphery was sewn except one side serving as an opening to obtain a bag for an outer bag of 41 cm x 61 cm. After four inner bags containing the above-mentioned water-absorbent resin particles are placed in the outer bag bag, the opening of the outer bag bag is sewn to sew the water bag of the present invention. I got a sac.

Example 2 A polyester multifilament yarn (560 dtex / 96f) is used for the warp, and a nylon air stuffer yarn (1100 dtex / 48f), which is a kind of crimped yarn, dyed black with cheese is used for the weft. , Warp density 36 threads / 2.54cm, weft density 2
A water bag according to the present invention was obtained in the same manner as in Example 1 except that a flat-textile woven fabric woven at 5 pieces / 2.54 cm was used as a bag for an outer bag.

Example 3 A polyester multifilament yarn (560 dtex / 96f) was used for the warp, and a black multi-filament polyester multifilament yarn (560 dtex / 96f) was woven at a warp density and a weft density of 36 yarns / 2.54 cm. A water bag according to the present invention having an increased surface frictional resistance was obtained in the same manner as in Example 1 except that the flat-textured woven fabric was used as a bag for an outer bag.

Example 4 The procedure of Example 1 was repeated, except that one side of the woven fabric was dot-coated with a polyurethane resin, and the dot-coated side was the surface to form a bag for an outer bag.
A water sac of the present invention having a non-slip surface was obtained.

Example 5 A half portion (one side) of one side of a woven fabric cut to a length of 84 cm and a length of 61 cm.
(42cm x 61cm), sewn the male material of the hook-and-loop fastener cut to 5cm width at 10cm pitch in the warp direction and attached.
Except for making a bag for the outer bag by sewing the female material of the hook-and-loop fastener cut to 5 cm width in the other half at a pitch of 10 cm in the weft direction, so that the surface where the hook-and-loop fastener is attached becomes the surface. In the same manner as in Example 1, a water bag of the present invention having a cloth having a non-slip function attached to the surface was obtained.

Example 6 0.5% by mass of a benzotriazole-based ultraviolet absorbent (manufactured by Kyodo Yakuhin, Biosorb 52, based on the water-absorbent resin powder)
A water bag of the present invention was obtained in the same manner as in Example 1 except that 0) was added.

Comparative Example 1 The warp density and the weft density of a woven fabric having a flat texture were both 20 yarns / weft.
A water sac for comparison was obtained in the same manner as in Example 1 except that the distance was 2.54 cm.

COMPARATIVE EXAMPLE 2 The warp density and the weft density of a woven fabric having a flat texture were both 50 yarns /
A water sac for comparison was obtained in the same manner as in Example 1 except that the distance was 2.54 cm.

COMPARATIVE EXAMPLE 3 Without using an inner bag, the average particle size was 4 in the bag for the outer bag.
A water sac for comparison was obtained in the same manner as in Example 1 except that 200 g of the water-absorbent resin particles of 00 μm was directly charged.

Table 1 below shows the cover factor values of the woven fabrics used for the outer bag in the above Examples and Comparative Examples.

[0027]

[Table 1]

The performance of the blisters obtained in the above Examples and Comparative Examples was evaluated by the following methods. (1) Transportability After placing a water bag that has not absorbed water on the carrier of a light truck and traveling for 2 hours on a general road, the inclusion was not leaked out. The evaluation was made by setting the product to x. (2) Water Absorption and Water Retention A water sac was placed in a water tank, allowed to absorb water for 10 minutes, taken out, and weighed. Further, after the taken out water sac was left outdoors for 3 days in a place free from the influence of rainwater, the mass was measured again. (3) Leakage of resin after absorbing water Leakage of the water-absorbing resin from the water-swelled water sac was evaluated according to the following criteria. ×: Leakage of the water-absorbing resin is observed with the water sac standing still. Δ: Leakage of a small amount of water-absorbent resin is observed when pressure is applied to the water bag ○: No leakage of water-absorbent resin is observed even when pressure is applied to the water bag (4) Stackability Water absorption expansion When the water sac that could be stacked in two stages was rated as ○, when it was not possible to stack in two stages and slipped down, it was rated as ×.

Table 2 below shows the results of the evaluation of the performance of the sac as described above.

[0030]

[Table 2]

As is clear from the above results, Example 1
The water sac of the present invention obtained in Nos. 6 to 6 exhibits excellent water absorption performance of weighing about 20 kg in 10 minutes after the start of water absorption, does not leak out the water-absorbent resin after water absorption and expansion, and has excellent water retention. It was a water bag that could be stably stacked. On the other hand, in Comparative Example 1, the cover factor value of the woven fabric used for the bag for the outer bag was too small, so that the water absorption was excellent, but the water-absorbing resin leaked out after the water-swelling expansion. The leaked resin made the surface slippery and could not be stacked. On the other hand, in Comparative Example 2, since the cover factor value was too large, there was no leakage of the water-absorbing resin, but water absorption was hindered. Further, in Comparative Example 3, since the inner bag was not used, the water-absorbent resin particles became "dama-shaped" when absorbing water, and could not sufficiently exhibit water-absorbing performance.

[0032]

The water sac of the present invention has excellent uniform and quick water absorption performance, absorbs a large amount of water in a short time, and expands to a predetermined size. It is suitable as a water bag used for stacking or for absorbing water for drainage purposes. In addition, the water sac is excellent in sealing the inclusions without leakage of the water-absorbent resin particles or the like during transportation before water absorption or after water absorption and expansion. The water sac according to the present invention is a water sac that has the above-described excellent performance and is simple in structure, and therefore excellent in productivity. Further, according to a preferred embodiment of the present invention, it is possible to provide a hydropouch having a structure that is less slippery on the surface and has increased stability during stacking.

Claims (4)

[Claims] 1. A water bag having an inner bag and an outer bag, wherein the inner bag is a hydrolyzable or water-soluble bag, and contains water-absorbent resin particles. A water bag, which is a bag made of a synthetic fiber cloth having a cover factor value of up to 1600, and including a plurality of inner bags. 2. The water bag according to claim 1, wherein a crimped yarn or a tangled yarn is used for the synthetic fiber fabric. 3. The water bag according to claim 1, wherein the outer bag is provided with a non-slip surface. 4. The water bag according to claim 1, wherein a cloth or a sheet having an anti-slip function is attached to a surface of the outer bag.