JPH0341597B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is lightweight and does not cause radio wave interference.
Moreover, the present invention relates to a method for easily and efficiently manufacturing synthetic resin barbed wire that is excellent in durability, strength, and ability to tightly hold a barb.

So-called barbed wire has traditionally been used for fences and fences for security, crime prevention, and cattle ranching, but because it is made of metal, it is heavy, rusts easily, and has poor durability. There is a drawback.

In order to improve this durability, it is known that the core wire of barbed wire is galvanized or coated with resin, but even these improved barbed wires still do not have sufficient durability, and for example, when used for livestock farming. Not only do they injure livestock that come into contact with them and cause radio interference, but they are also quite expensive.

On the other hand, attempts have been made to change the material of conventional barbed wire from metal to synthetic resin. For example, in Japanese Patent Application Laid-open No. 53-58199, a single or stranded plastic wire is used with a plastic barb. A barbed plastic wire fixed with adhesive has been proposed. However, the adhesion of this barbed plastic wire to the barbed plastic wire deteriorates over time during use, making it easy for the barbed body to peel or fall off. Even if the core wire is heat-fused and fixed to the core wire, the processing method is complicated and the cost is high, and there are problems in that it is difficult to avoid deterioration of the fused portion.

There is also a method of applying plastic wire to the conventional barbed wire manufacturing method, twisting two or more plastic wires together, winding the plastic wire around appropriate parts of the twisted wire, and cutting it fixedly to form a barbed body. However, in this method, due to the repulsive force of the plastic wire, it is not possible to tightly wrap the barbed body around the strands, and only a barbed plastic wire can be obtained that is significantly lacking in the ability to tightly hold the barbed body.

Therefore, the present inventors have worked diligently to easily and efficiently produce a synthetic resin barbed wire that is lightweight, does not cause radio wave interference, and has excellent durability, strength, and ability to tightly hold the barbed body. As a result of our investigation, we found that the material is made of three or more synthetic resin monofilaments, one of which has a synthetic resin barb attached in advance, and the barbed monofilament is connected to the other two without barbs. The inventors have discovered that the above object can be effectively achieved by twisting the monofilaments described above and heat-setting them, thereby achieving the present invention.

That is, the present invention provides a synthetic resin monofilament in which synthetic resin barbs are fixed in advance at equal intervals, and at least two synthetic resin monofilaments without barbs are placed between adjacent barbs. The monofilament material is twisted so that at least one twist is generated in the monofilament material, and the splinter is tightly held from both sides, and then heat-set at a temperature above the glass transition point and below the melting point of the monofilament material. The present invention provides a method for manufacturing synthetic resin barbed wire.

In the present invention, first, three or more synthetic resin monofilaments are prepared as raw materials. This monofilament material is nylon 6, nylon
Synthetic resins that can be spun and drawn include polyamides such as 66, nylon 11, nylon 12 and their copolymers, polyesters such as polyethylene terephthalate, polybutylene terephthalate and their copolymers, and polyolefins such as polyethylene and polypropylene. These may contain the usual additives such as colorants, weathering agents, stabilizers, flame retardants, fillers, plasticizers, fluorescent agents and lubricants. As a method for producing monofilaments from these synthetic resins, a normal melt spinning method can be employed, and after spinning, the monofilaments can be stretched to an appropriate ratio for use. Although there is no particular restriction on the thickness of the monofilament, a diameter of about 0.5 to 5.0 mm is usually suitable from the viewpoint of workability and strength.

Then, synthetic resin stingers are fixed in advance to one of the three or more synthetic resin monofilaments at equal intervals. The synthetic resin barb 1 herein is composed of a base part 2, a hollow part 3, a plurality of barbs 4, and a plurality of concave parts 5, which are integrally molded from synthetic resin, as shown in FIG. 1A and B, for example. These are manufactured by, for example, injection molding a synthetic resin. The material of these stingers 1 is desirably the same as the monofilament material to which they are fixed, or a synthetic resin having affinity therewith. Further, the number of thorns 4 provided on this thorn body 1 is one or more and is arbitrary, but usually 3 to 6 is preferable.

When fixing this sting 1 to the synthetic resin monofilament at equal intervals, as shown in FIG. 2, the monofilament 6 is passed through the hollow part 3 of the sting 1,
The contact portion between the monofilament 6 and the hollow portion 3 is bonded using an adhesive or by a heating fusion method.
Fix it. The monofilament shown in FIG. 2 thus obtained is hereinafter referred to as barbed monofilament 6. When this barbed monofilament and at least two other monofilaments without barbs are twisted together, these three or more monofilaments can be made of the same or different types of synthetic resin, but as barbed monofilament materials, It is desirable to select a monofilament material with a higher softening point than at least two other monofilament materials.

Next, a method for manufacturing the synthetic resin barbed wire of the present invention will be explained with reference to FIGS. 3 and 4.

Figure 3 shows how bobbins 9 and 9', wound with two monofilaments 8 and 8' without threads, are mounted diagonally on the bobbin mounting plate 7, which itself rotates in the direction of the arrow. While rotating the plate, pull out the two monofilaments 8, 8' and insert the hollow part 1 in the center of the bobbin mounting plate 7.
This is an embodiment in which the barbed monofilament 6 is pulled out from 0. In the method shown in FIG. 3, if the barbed monofilament 6 and the monofilaments 8, 8' are fed out by the rotation of the delivery rolls 11, 11' and the nip roll 12, these three monofilaments are twisted together at the joining point 13. while moving forward in the direction of the winding roll 14. The twisted monofilaments are heat-set in a heating zone 15,
The synthetic resin barbed wire 1 is cooled in the cooling zone 16.
7 and is wound up on the winding roll 14.

The nip roll 12 used here is for steady feeding of the monofilament, and a star-shaped roll or the like in which grooves are provided in the barbed portion of the barbed monofilament 6 is preferably used. Further, as the heating zone 15, an infrared oven, a hot air circulation type oven, etc. are preferably used, and as the cooling zone 16, a water tank, an air cooling tank, etc. are preferably used.

On the other hand, FIG. 4 shows another embodiment of the present invention, in which three monofilaments are drawn out in parallel and twisted together by rotation from the rear of the process. In other words, in the method shown in FIG. 4, the barbed monofilament 7 and the other two monofilaments 8 and 8', which do not have barbs, are transferred from a suitable fixed bobbin (not shown) to the nip roll. 12 in parallel, and by rotating the support frame 19 of the winding drum 18 at the rear of the process in the direction of the arrow.
Monofilament 8 before and after Nitzprol 12,
8' is twisted. The monofilaments thus twisted are heat-fixed in the heating zone 15 and cooled in the cooling zone 16 to form a synthetic resin barbed wire 17, which is then wound onto a winding drum 18.

The heat fixing temperature in the heating zone shown in Figures 3 and 4 is appropriately above the glass transition point and below the melting point of the synthetic resin that is the monofilament material, and sufficient heat fixation cannot be achieved below the glass transition point. If the melting point is exceeded, the monofilament may be deformed or the thorns may be made pure, which is not desirable.

Thus, the synthetic resin barbed wire 17 obtained by the method of the present invention is formed by twisting two monofilaments 8 and 8' without barbs between the barbs 1, as shown in FIG. 5A and B. The barbed monofilament 6 is intertwined with the barbed monofilament 6 at equal intervals, and the monofilaments 8 and 8' tightly press the concave portion 5 of the barbed body 1 from both sides, so that the barbed monofilament 6 is intertwined with the barbed monofilament 6. In addition to being joined together, it is further fixed with monofilaments 8 and 8', and the tightness of the stab body 1 is extremely excellent.

As explained above, the synthetic resin barbed wire obtained by the method of the present invention is made entirely of synthetic resin, so it is lightweight and does not cause radio interference.
Moreover, it has extremely high strength, durability, and ability to tightly hold the pieces, and by attaching it directly to a shelf or further processing it into a net-like body, it can be used as fences and fences for security, crime prevention, and livestock farming. It can be suitably used for these applications in areas where radio wave interference is likely to occur, such as airports and ports.

The present invention will be further explained below with reference to Examples.

Example Nylon 6 colored black (CM1011 manufactured by Toray Industries, Inc.)
By injection molding, a barb having the shape shown in FIG. 1 (barb length 15 mm, hollow part diameter 0.35 mm, thickness 5 mm) was obtained.

On the other hand, a polyethylene terephthalate (type 2500 manufactured by Toray Industries, Inc. manufactured by Toray Industries, Inc.) was made from the black nylon 6 with a diameter of 0.3 mm using the usual melt spinning method.
A monofilament with a diameter of 2.0 mm was obtained from.

Then, the black nylon 6 monofilament was passed through the hollow part of the nylon 6 barb, and the barbed monofilament was fixed at equal intervals of 75 mm using an epoxy adhesive to obtain a barbed monofilament.

Next, the black polyethylene terephthalate monofilament is loaded into the bobbins 9 and 9' of the apparatus shown in FIG. was rotated at 80 times/min and the Nipprol 12 was rotated at 3 m/min to continuously draw out the three monofilaments and twist them together. The twisted monofilaments were heat-set by passing through a heating zone (a 2 m long electric oven using air at 100°C ± 5°C), and then through a cooling zone (a 1 m long water tank). After cooling, it was wound onto a winding roll.

The synthetic resin barbed body thus obtained is
The three monofilaments are tightly twisted together by heat-setting, and the barb is tightly held, which not only provides excellent strength, but also causes no radio interference compared to conventional barbed wire. It was lightweight and extremely durable.

[Brief explanation of the drawing]

1 is a plan view A and a side sectional view B of the barbed body, FIG. 2 is a plan view of the barbed monofilament, FIGS. 3 and 4 are plan views of the device used in the method of the present invention, and FIG. FIG. 2 is a plan view (a) and a side sectional view (b) of a synthetic resin barbed body obtained in the present invention. 1-spine body, 6-barbed monofilament, 8,
8'~monofilament, 12~nituprole,
14-winding roll, 15-heating zone, 16-
Cooling zone, 17~Synthetic resin barbed wire.

Claims (1)

[Claims] 1. For a synthetic resin monofilament formed by fixing synthetic resin stingers at equal intervals in advance, at least two synthetic resin monofilaments without stingers are placed between the adjacent stingers. A material made of synthetic resin, characterized in that it is twisted so as to tightly hold the needle from both sides, and is then heat-set at a temperature above the glass transition point and below the melting point of the monofilament material. Method of manufacturing barbed wire.