JPH0434018Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a sheet for civil engineering that has a large earth and sand reinforcement effect and is excellent in earth and sand barrier properties and water permeability. (Prior Art) Synthetic fiber woven fabrics and synthetic fiber nonwoven fabrics have been widely used for the purpose of reinforcing earth and sand, separating earth and sand from water, and the like. For example, as shown in Publication No. 61-35310, a bulky net-like body formed by a spunbond method is surrounded by two sheets of non-woven fabric containing thermoplastic resin, and both sides of the non-woven fabric are bonded to the bulky net-like body. A sheet for civil engineering with a carbon fiber coating is known. (Problem that the invention aims to solve) However, the above-mentioned sheet can be bent or folded into various shapes during civil engineering work, and can be easily applied to areas that require drainage, and has good water permeability. However, the reinforcing effect of earth and sand was not sufficiently satisfactory. In general, the higher the fiber density of a woven fabric, the stronger it becomes, and the more effective it is at reinforcing earth and sand. In addition, the barrier properties of the earth and sand for separating earth and water are also improved. However, since the fabric density is high, the fiber gaps are small and water permeability is reduced. On the other hand, in the case of a woven fabric with a coarse structure in which fiber gaps are large and made of thick yarn with high strength, high strength and high water permeability can be obtained.
However, the sheet had the disadvantage that finer sand could flow out due to its poor earth and sand barrier properties. As described above, the current situation is that no civil engineering sheet has been obtained that satisfies all of the earth and sand reinforcement effect, earth and sand barrier properties, and water permeability. (Means for Solving the Problems) In order to solve these problems, this invention was developed as a result of intensive research, and was developed as a sheet for civil engineering that has a great reinforcement effect against earth and sand, and also has high earth and sand barrier properties and water permeability. has been reached. In other words, in this invention, the tensile strength is per 3 cm width,
The gist of this product is a sheet for civil engineering, which is made by point-bonding a synthetic fiber fabric weighing 100 kg or more and a synthetic fiber non-woven fabric weighing 1 mm or more thick. The civil engineering sheet of this invention is a structure that integrates synthetic fiber woven fabric and synthetic fiber non-woven fabric by point bonding, and the reinforcement against earth and sand is mainly done by the fabric, and it has high earth and sand barrier properties and water permeability. This is mainly done by the nonwoven fabric, so that it is possible to obtain a sheet that has a high earth and sand reinforcing effect, which is the object of the present invention, and has excellent earth and sand barrier properties and water permeability. First, the tensile strength of the fabric used for the sheet is 3cm wide.
It is necessary to weigh more than 100 kg per person. 100Kg
If it is less than that, the reinforcing effect of the earth and sand will decrease, which is not preferable. Next, the thickness of the nonwoven fabric bonded to the fabric must be 1 mm or more; if the thickness is less than 1 mm, it is difficult to suppress the outflow of earth and sand, depending on the entanglement density of the fibers of the nonwoven fabric. Next, each method described below can be used as a method of bonding the woven fabric and the nonwoven fabric together by point adhesion. (1) A method in which a nonwoven fabric sheet made of thermoadhesive resin is sandwiched between a woven fabric and a nonwoven fabric. (2) Heat-adhesive fibrous materials, powders, granules, etc. made of low melting point or low softening point polymers are mixed in advance with the fibers constituting the nonwoven fabric into the nonwoven fabric, and then the woven fabric and the nonwoven fabric are mixed together using a heating roll or the like. A heat-sealing method for pasting. (3) A method of point-adhering adhesive to a woven fabric using the gravure method and bonding it to a non-woven fabric. Among these methods, methods (1) and (2) in which the two are bonded by heat are preferred from the viewpoint of cost, performance, and workability. The most important thing in this joining step is that the woven fabric and nonwoven fabric are joined by point adhesion. This is because if the entire surface is bonded, the air permeability of the bonded fabric will be poor, and drainage will not occur smoothly, which will be a disadvantage in terms of water permeability. Next, the resin used for spot bonding is preferably a compound that has a high affinity with nonwoven fabrics and textiles. For example, in the case of polyester fibers, copolymerized polyester or polyacrylic ester adhesives,
When the adhesive is made of polyamide fibers such as nylon 6, 66, copolyamide adhesives or polyurethane adhesives are preferred. The bonding method can be either one-sided adhesive or double-sided adhesive. That is, any method may be used, such as a method of bonding woven fabrics on both sides with the nonwoven fabric in the center, a method of bonding nonwoven fabrics on both sides with the woven fabric in the center, or a method of simply bonding a woven fabric and a nonwoven fabric on one side only. Of the above bonding methods, the method of pasting woven fabrics on both sides with the nonwoven fabric in the center is the most superior in terms of strength.
It also has excellent soil and sand barrier properties and water permeability.
Furthermore, by placing the woven fabric in the center and attaching nonwoven fabrics to both sides, the basis weight of the woven fabric can be reduced, and a structure with excellent strength can be obtained. As described above, the most advantageous and best way to combine and laminate woven and nonwoven fabrics can be selected from the viewpoint of use. Next, when point-bonding the woven fabric and the nonwoven fabric using heat, the melting point or softening point of the thermoplastic resin should be at least 20°C or more, preferably 50°C or more lower than the melting point or softening point of the nonwoven fabric and the synthetic fibers that make up the woven fabric. desirable. Synthetic fibers used in this invention include nylon 6, nylon 66, polyethylene terephthalate,
Examples include polyvinyl chloride, vinylon, polypropylene, and the like. Next, the present invention will be explained with reference to the drawings. FIG. 1 is a cross-sectional view of a civil engineering sheet showing one embodiment of the present invention in which a woven fabric and a nonwoven fabric are point-bonded.
and are bonded on one side with adhesive 3. In this case, if the adhesive 3 is present on the entire surface of the fabric, the bonding sheet will have no air permeability, which will be disadvantageous in terms of water permeability. In the present invention, point bonding means that the bonded surfaces are not bonded over the entire surface, and preferably have a bonding area of about 10 to 70% of the normal bonding area. Next, FIG. 2 is a sectional view of a civil engineering sheet showing another embodiment of the present invention, in which a nonwoven fabric 2 is bonded to both sides of a woven fabric 1. Further, FIG. 3 is a sectional view of a civil engineering sheet showing another embodiment of the present invention, in which the woven fabric 1 is bonded to both surfaces of the nonwoven fabric 2. Note that two or more of the civil engineering sheets shown in FIGS. 2 and 3 can be stacked on top of each other, and may be appropriately selected depending on the purpose. (Function) The civil engineering sheet of the present invention can take advantage of the characteristics of the woven and nonwoven fabrics used, and the number of sheets of each can be appropriately selected, which is advantageous in terms of cost. The reason why layers can be stacked freely in this way is that water permeability is not hindered by point adhesion. The present inventors believe that the reason why sufficient durability can be obtained by point adhesion is as follows. First, it is possible to select an adhesive substance that has a high affinity for nonwoven fabrics and woven fabrics, and furthermore, nonwoven fabrics made of thermoadhesive resin can be used as adhesives, making it especially possible to manufacture sheets by bonding long fiber nonwoven fabrics and woven fabrics. In this case, the adhesive effectively works on each single fiber in nonwoven fabrics and woven fabrics, increasing the adhesive strength. In addition, since the woven fabric and nonwoven fabric are laminated by point adhesion, the thickness can be freely controlled by appropriately selecting the materials to be bonded. Therefore, a thick sheet can be easily obtained, and the material has good cushioning properties and is resistant to impact. Furthermore, the effect of thickness can reduce blockages caused by earth and sand. For these reasons, it is thought that it will be widely used as a sheet for civil engineering. (Example) Hereinafter, the present invention will be explained with reference to an example. Example 1 First, polyester multifilament 1500 denier/192 filament triplets (200 twists/
A polyester plain woven fabric was woven using threads having a total denier of 4,500 denier consisting of m) for the warp and weft. (Fabric density: Warp 12/inch, Weft 12/inch, Tensile strength: Warp 480Kg/3cm, Weft 475Kg/3cm). Next, the above polyester fabric was coated on both sides of a polyester spunbond nonwoven fabric (Unitika Co., Ltd. product, product name: APPEAL AN200, thickness 2 mm).
A copolymerized polyester (softening point: 140°C) was sandwiched between the sheets, and point adhesion was performed at a temperature of 160°C using heat-sealing heating rolls to bond the nonwoven fabric and the woven fabric to obtain the civil engineering sheet of the present invention. Table 1 shows the performance of the obtained civil engineering sheet. In addition, the water permeability is
Measured according to JISA1218. Comparative Example 1 The following test was conducted for the purpose of comparison with the present invention.
A polyester plain woven fabric was woven using the same polyester multifilament yarn as in Example 1 (total denier 6000 denier/192×4 filaments, number of twists 200 times/m) for the warp and weft. (Fabric density: warp 14/inch, weft 14/inch; tensile strength: warp and weft 740 kg/3 cm) Table 1 shows the performance of the obtained fabric.

[Table] As is clear from the table, the civil engineering sheet of Example 1 of the present invention had substantially the same tensile strength as the fabric of Comparative Example 1, but had extremely high water permeability. (Effects of the invention) The civil engineering sheet of the invention has a large earth and sand reinforcement effect, and has excellent earth and sand blocking properties and water permeability, and has excellent drainage performance without clogging drainage channels. Sediment runoff is also extremely low. Furthermore, because of its thickness, it has good cushioning properties, high impact resistance, and is highly durable, making it widely usable as a civil engineering sheet.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a civil engineering sheet in which a woven fabric and a non-woven fabric are dot-bonded according to the present invention, and Fig. 2 is a sectional view of a civil engineering sheet in which a non-woven fabric is dot-bonded on both sides of a woven fabric.
FIG. 3 is a sectional view of a sheet for civil engineering in which woven fabrics are dot-bonded on both sides of a nonwoven fabric. 1... woven fabric, 2... non-woven fabric, 3... adhesive.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A sheet for civil engineering made by spot-bonding a synthetic fiber fabric with a tensile strength of 100 kg or more per 3 cm width and a synthetic fiber non-woven fabric with a thickness of 1 mm or more. (2) A sheet for civil engineering according to claim 1, which is obtained by spot-bonding a synthetic fiber nonwoven fabric onto at least one side of a synthetic fiber fabric. (3) A sheet for civil engineering according to claim 1, which is obtained by dot-bonding a synthetic fiber woven fabric on both sides of a synthetic nonwoven fabric. (4) A sheet for civil engineering according to claim 1, 2, or 3 of the utility model registration claim, which is formed by laminating two or more sheets formed by dot-bonding a synthetic fiber woven fabric and a synthetic fiber nonwoven fabric.