JPS62299542A - Base cloth for tarpaulin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a base fabric for tarpaulins. Tarpaulin is a sheet-like composite made by thermo-compressing or laminating a film of thermoplastic resin on the front and back sides of a coarse woven or knitted base fabric, and is used in sail cloth, agricultural greenhouses, tents, etc. Used for vehicle canopies, outdoor pile covers, construction sheets, etc.

[Prior art and problems]

As a base fabric for tarpaulin, JP-A-58-10425
5 and JP-A No. 60-119250, a coarse base fabric is often used in which the intersections of warps made of multifilaments and wefts made of multifilaments are bonded together.

Tarpaulins are exposed to outdoor rain, dew, seawater, etc.
Measures must be taken to prevent water from penetrating into the fabric from the cut surface, but commercially available measures are inadequate. As a result, problems such as film peeling, deterioration of the base fabric, and mold growth have arisen6.For example, sail cloth for sailboats and windsurfing is exposed to seawater, wind, and rain under harsh conditions, so it absorbs water and the film Peeling and mold growth impair the appearance and reduce the product value.

One way to prevent tarpaulin from absorbing water is to harden the fiber bundles used for the base fabric with resin, but even if the fiber bundles are immersed in resin liquid, it is difficult for the resin to penetrate inside the fiber bundles. The part where the resin is not present absorbs water, which is not preferable. Furthermore, even if the resin completely penetrates, since the tarpaulin is a flexible sheet, the filament bundle is subjected to a fir-like action during use, causing cracks in the resin and water absorption.

On the other hand, methods for using a water repellent include a method in which the fiber bundle is treated with a water repellent and then glued at the intersection of warp and warp yarns, and a method in which a water repellent is applied after the adhesive base fabric is prepared. There is.

In the former case, the adhesive strength of the warp and warp threads is greatly reduced due to the releasability of the water repellent, making it difficult to manufacture the base fabric. In addition, unless the manufactured base fabric is handled carefully, the warp and warp yarns will separate with a little force, making it difficult to maintain the shape of the base fabric. In the latter case, the adhesive base fabric is
When immersed in a water repellent bath, the solvent in the water repellent penetrates into the intersections of warp and warp yarns, reducing adhesive strength and causing problems such as the warp yarns coming apart due to the force applied to them during the dipping process. There is a point.

[Solution]

The present invention solves the above-mentioned problems, and the periphery of either the warp or the weft yarn made of multifilament is wound with a heat-fusible thread, and the intersection of the warp and weft yarns is the heat-fusible yarn. This is a base fabric for tarpaulins that is glued with thread and has a potash-fluorine water repellent applied to the warp and warp threads.

That is, the present invention uses an emulsion-type fluorine-based water repellent that does not exhibit water repellency but develops water repellency in a single step of heat curing when applying the water repellent, and uses heat-sealable thread as an adhesive. By wrapping it around one side of the weft and weft threads and bonding them by heat-sealing, we succeeded in obtaining water repellency and sufficient adhesion between the warp and warp threads as a base fabric.

FIG. 1 is an example of a product according to the invention. (1) is the warp, (2) is the weft with the fusible yarn (3) wrapped around it, and (4) is the base fabric bonded at the intersection (5) of the warp (1) and weft (2). Note that the warp and warp yarns are all treated to be water repellent, and exhibit water repellency except at the points where they are bonded to the fusible yarn. This will be explained in detail below.

The warp and warp yarns are required to have high elasticity and high elongation due to their use as tarpaulins, and multifilament yarns such as polyester, vinylon, nylon, and aromatic polyamide are used.

And it is preferable that it is untwisted or lightly twisted.
When non-twisted yarns or twisted yarns are used, the multifilaments and fused fused yarns are compressed and flattened during base fabric production and tarpaulin production, so the tarpaulin surface has fewer irregularities and the surface film does not break.

If you use twisted yarn that is not flattened, the thickness of the yarn will appear as is on the surface of the tarpaulin, and the thickness of the film may become thinner at the yarn portion, making the film more likely to break.

As the water repellent agent, a water repellent agent that exhibits water repellency by heat curing with a fluorine-based agent is used. This water repellent is a copolymer with perfluoroalkyl groups in the side chains of the base polymer that adheres to the material.After adhering to fibers, etc., the perfluoroalkyl groups are arranged in a well-aligned manner through heat curing, resulting in Shows water repellency by lowering energy and reducing wettability with water. This water repellent is usually an emulsion type. The amount of adhesion is 0.
0.5vt%, preferably 5-2.0wt%
If it is less than 2.0 VIt%, water absorption increases, and if it is 2.0 VIt% or more, there is no difference in the water absorption prevention effect. 1. When it is deposited in an amount of Ovt% or more, almost complete water absorption prevention effect can be obtained.

The fusible yarn is a filament that has the ability to fuse the warp and weft. Preferred fusible yarns include polyethylene, polypropylene, polyester, polyvinylidene chloride, polyethylene vinyl acetate, nylon, and conjugate fibers thereof, and fibers having a melting point lower than that of the warp or weft around which they are wound are used. The thickness and amount of wrapping of the fusible yarn are selected depending on the thickness and arrangement interval of the weft and warp yarns so as to obtain sufficient adhesive force.

The water repellent agent is cured by the heat used to melt the fusible thread in the multifilament with the fusing thread wrapped around it, and the water repellency has been developed, but the thread without the fusing thread wrapped around it has water repellency. Since the thread is unheated or only slightly heated,
Water repellency and mold releasability have not yet been developed, and at this stage the melted fusion thread and multifilament come into contact and are fused together.

If the thread is not wrapped with the fusing thread, it will fall apart, which may be inconvenient depending on the application.

Therefore, a resin emulsion may be added to the fluorine water repellent bath as a sizing agent. At that time, ha.

A material with good dispersibility in the same bath as the water emulsion must be used.

This will be explained in detail in the following examples.

Example 1 Polyester multifilament (500 denier/96F) was used as the warp, immersed in a mixed solution of the following formulation, and
Squeeze with this roll, dry, and apply 1 fluorine water repellent to the yarn.
．． 5wt%, sizing agent5. Owt% adhered.

Fluorine water repellent Dickguard F50 (manufactured by Dainippon Ink Chemical Co., Ltd.)...31 parts Sizing agent Finetex ES850 (nonionic self-emulsifying polyester emulsion, manufactured by Dainippon Ink Chemical Co., Ltd.)...48 parts water...・21 parts polyester multifilament (500 denier/
Fluorine water repellent 1,
5 wt % was attached to the core yarn, and 70 vt % of a low melting point polyester filament (200 denier/48 F, melting point 190° C.) was wound around the core yarn as an lJf yarn.

Preparation of Base Fabric A base fabric was produced using the warp and weft described above using the manufacturing apparatus schematically shown in FIG.

The warp threads (1) were pulled out from the crill stand (6a and 6b) and arranged through the warping means (7a and 7b).

The weft (2) was passed through the rotating arm (8) and wound around the support member (9). These weft threads are advanced by the rotation of the weft support member (9), forming a sheet of parallel weft threads, and are advanced while being held between the endless belts (10a and 1°b) from near the end of the weft support member (9). Ta. The heat-fusible yarn component becomes molten in the heating furnace (11) and is heated to a heated presser roll (12).
), the warp and weft are adhesively bonded by the heating press roll (12) which is the joint between the warp and weft, separated from the weft holding belts (10a and 10b), and the excess weft is cut off. It was wound up with a take-up roll (13). Curing was performed using a heating roll (14). In this way, a base fabric with a 3M structure of warp/weft/warp was obtained. Tissue density is 4 meridians/c
m, latitude 3.3 lines/cm.

This base fabric was used as a core material and a 25 μm thick polyester film was attached to the front and back surfaces with an adhesive (Hybon 7663, manufactured by Hitachi Kasei Polymer Co., Ltd.) to form a tarpaulin. Water absorption and film peeling tests were conducted on this tarpaulin. The results are shown in Table 1.

Similarly, the prescribed amount of the fluorine water repellent was adjusted so that the amount of water repellent applied to the multifilament was 0.5 wt%, 1.
Tarpaulins were produced using base fabrics with concentrations of 0 wt% and 2.0 wt%, and their water absorptions were measured. The results are shown in Table 1.

The peel strength is 2kg/2, although it varies depending on the tarpaulin usage.
If it is 5 mm or more and the water absorption is 15 mm/day, it is suitable for normal use.

Test method Peeling test: Peeling test was carried out according to J-Ko S-6772 except that the sample width was 25 mm (tensile speed 200 mm/m1
n).

Water absorption test: A tarpaulin was cut to a size of 30 mm x 10 mm, the entire piece was kneaded 30 times, the lower end 20 mm was immersed in red ink for 1 day, then pulled out and the ink penetration length from the lower end was measured.

Example 2 The same procedure as in Example 1 was carried out except that Kevlar multifilament (40° denier/267 F) was used as the warp. The results are shown in Table 1.

Comparative Example 1 The same procedure as in Example 1 was carried out except that no fluorine water repellent was used. The results are shown in Table 1.

Comparative Example 2 The same procedure as in Example 2 was carried out except that no fluorine water repellent was used. The results are shown in Table 1.

Table 1 − means not measured

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tarpaulin base fabric, and FIG. 2 is a schematic diagram of a manufacturing apparatus.

Claims (1)

[Claims] 1 One of the warp and weft yarns made of multifilament is wound with a heat-fusible thread, the intersection of the warp and weft is bonded with the heat-fusible thread, and a fluorine-based water repellent is used. A base fabric for a tarpaulin, characterized in that the warp and warp yarns are given.