JP2002065140A - Sinker-attached net - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an environmentally friendly sinker-attached net having a sinker prevented from the elution of hazardous constituents therefrom, and facilitated in the molding processing of the sinker. SOLUTION: This sinker-attached net 10 is obtained by putting a sinker 13 on a net sheet 12 having a specified shape. The sinker 13 comprises a composite material comprising a thermoplastic resin and tungsten powder. The weight ratio of the thermoplastic resin to the tungsten powder is preferably (7:3) to (8:2). The thermoplastic resin is preferably a polyamide. The average particle diameter of the tungsten powder is preferably <=50 μm. The form of the sinker 13 is preferably a cord shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a net with a weight applied to a protective net, a fish net and the like.

[0002]

2. Description of the Related Art Hitherto, as a weighted net, a net provided with a sinker rope at an end of a net surface has been known. For example, as shown in FIG.
The rope 3 is sewn. A rod-shaped weight 4 is knitted inside the sled rope 3. In the length direction of the rope,
The shaft thread 5 extends, and the weight 4 is passed through the shaft thread 5 in order. As a material of the weight 4, lead (round), which is a high specific gravity metal, is usually used.

[0003]

However, such a conventional weighted net uses lead, which is highly water-soluble and toxic, as a material of the weight.
There is a problem that harmful components are released to the environment. In recent years, the importance of environmental issues has been emphasized, and there is an increasing demand for preventing such harmful lead components from being eluted.

[0004] Further, the conventional weighted net has a structure in which a plurality of weights are passed through the shaft thread, so that the forming of the weights is troublesome and troublesome.

Accordingly, the present invention has been made in view of such circumstances, and provides an environment-friendly net with a weight that prevents elution of harmful components from the weight and facilitates the forming process of the weight. The purpose is to do.

[0006]

According to a first aspect of the present invention, there is provided a net with a weight, wherein a weight is provided on a mesh surface having a predetermined shape to support the mesh surface. The weight is made of a composite resin material of a thermoplastic resin and tungsten powder. The weighted net of the present invention (claim 2) is characterized in that the mixing ratio of the thermoplastic resin and the tungsten powder is 5/5 to 8/2 by weight. The weighted net of the present invention (claim 3) is characterized in that the thermoplastic resin is polyamide. The weighted net according to the present invention (claim 4) is characterized in that the average particle size of the tungsten powder is 50 μm or less. The weighted net of the present invention (claim 5)
The weight is formed in a cord shape.

According to the weighted net of the present invention (claims 1 to 5), tungsten having extremely low water toxicity is used as the material of the weight. It is hard to put a burden.

Further, by combining the thermoplastic resin with the tungsten powder, the moldability of the weight is improved, and the tungsten powder is covered with the resin, so that the amount of tungsten eluted is extremely reduced.

As the thermoplastic resin, polyamide,
Polyester, polycarbonate, polyether sulfone, polyolefin, polyphenylene oxide, polyphenylene sulfide, polyether ether ketone, AS resin, AN resin, ABS resin and the like can be used.

[0010] Of these thermoplastic resins, it is particularly preferable to use polyamide. According to the polyamide, it is easy to secure excellent strength to the composite material, and water resistance, heat resistance,
This is because a weight excellent in weather resistance and the like can be obtained.

As the polyamide, for example, nylon 6, nylon 11, nylon 12, nylon 6.6,
Nylon 6, 10, Nylon 6, 12, Nylon MXD
One or more compounds such as 6 can be used. In order to further improve the strength and heat resistance of the weight, an aromatic polyamide (aramid) may be used.

The thermoplastic resin may contain, if necessary, an antioxidant and a heat stabilizer (for example, hindered phenol, hydroquinone, thioether, phosphites, and their substituted products and combinations thereof). ,
UV absorbers (eg, various resorcinols, salicylates, benzotriazoles, benzophenones, etc.), antistatic agents (sodium benzenesulfonate, polyalkyl glycols, etc.), crystallization accelerators (polyethylene glycols, etc.), coupling agents (silanes, One or more kinds of coloring agents such as titanates, aluminums, etc., additive impregnating liquids (silicone oils, etc.), pigments, dyes and the like can be added.

Preferably, the tungsten powder has an average particle size of 50 μm or less, and the particle size distribution is
Those having a particle size of 10 μm or less are preferably 50 wt% or more in the proportion of the whole tungsten powder, and those having a particle size of 20 μm or more are preferably 30 wt% or more. This is because the fluidity of the composite resin material at the time of melting is increased, and the moldability is improved. Further, a tungsten alloy powder may be used as the tungsten powder. Further, another metal powder may be mixed with the tungsten powder.

The mixing ratio of the thermoplastic resin and the tungsten powder is preferably 5/5 to 8/2 by weight. The weight ratio is set to 5/5 or more because if the content of the thermoplastic resin is small, the flexibility, durability, strength, and the like of the weight are likely to be insufficient. The weight ratio is set to 8/2 or less because the specific gravity of the weight cannot be sufficiently increased when the content of tungsten is reduced. More preferably, the mixing ratio of the thermoplastic resin and the tungsten powder is 7/3 to 8/2 by weight.

As a method of mixing the tungsten powder with the thermoplastic resin, various known methods can be used. For example, it is preferable to perform melt kneading with a single-screw or twin-screw kneader.

Regarding the shape of the weight, the composite resin material may be formed in a cord shape. This is because the weight can be easily manufactured by extrusion, and the weight can be easily attached to the net surface. For example, it becomes possible to sew the weight as it is on the hem of the net surface in the same manner as the silico rope. Further, according to the cord-shaped weight, it is easy to cope with the deformation of the net surface, and it is difficult to form a gap in the skirt, so that the use of the weighted net is expanded.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the weight-attached net 10 is provided with a cord-shaped weight 13 at a foot 12 a of a net surface 12. A weight 13 is sewn to the hem 12a with a fixing thread 14.

The mesh surface 12 is formed in a Russell weave.
According to Russell weaving, the knot at the intersection of the warp and the weft is finished without any knots, and the net surface has a strong appearance.

The shape of the mesh surface 12 can be various shapes such as a rectangle and a circle. Weight 13 on the entire outer periphery of mesh surface 12
Or a weight 13 having a predetermined length may be attached to a part of the outer periphery of the mesh surface 12.

As the knitting mesh yarn of the mesh surface 12, synthetic fibers such as polyethylene, polypropylene, nylon, polyester, acryl and vinylon may be used. This is because the durability of the mesh surface 12 is improved. Further, in order to increase the strength of the net, a metal wire such as stainless steel may be simultaneously woven into the net yarn of the net surface 12. Furthermore, it is also possible to use a shape memory alloy for the metal wire and store the net shape.

The weight 20 is formed by extruding a composite resin material of a thermoplastic resin and tungsten powder. The cord shape of the weight 13 is desirably a circular cross section. Since there is no corner on the peripheral surface of the weight 13, the fixing thread 14
This is because it becomes difficult to cut due to the friction between them and the durability is improved.

The weight of the weight 13 can be adjusted by changing the thickness of the weight 13 in addition to increasing or decreasing the blending amount of the tungsten powder. For example, the outer diameter can be freely adjusted from several mm to several tens mm depending on the use of the net. Specifically, when the thickness of the weight 13 is set so that the weight 13 is 60 to 70 g / m, a product excellent in practicality and versatility is obtained.

According to the weighted net 10, the weight 1 is exposed to rainwater or the like.
Even when 2 is wet, harmful components do not dissolve and it is gentle and safe to the surrounding environment. In addition, since the weight of the weight is sufficiently secured by tungsten having a relatively high specific gravity, the effect of supporting the mesh surface 12 is also high. Further, since the weight 13 is easily formed and the weight 13 is easily attached to the net surface 12, the number of manufacturing steps of the net 10 is reduced, and mass productivity is improved.

The net 10 with a weight can be used as a net for wind protection or sand protection, cultivation of horticultural crops, prevention of birds and beasts, and the like. For example, a cord-shaped weight 12 attached along the outline of the net surface 12 may be used to avoid crows at a garbage collection site. In addition, net 1 with weight
0 can also be applied to an underwater net such as a fishing net.

In the above embodiment, the net surface 12 is a Russell weave, but other knotless or knotted knitted meshes (plain weave, entangled weave, tricot, single tricot, etc.) may be adopted.

In the above embodiment, the shape of the weight is
Although the weight 13 is formed in a cord shape, it may be formed in a plate shape, a spherical shape, or another shape. In the case of forming a cord, the longitudinal section may be elliptical, polygonal, or the like, or unevenness may be provided in the length direction of the weight to make the thickness non-uniform.

[0027]

As described above, according to the weighted net of the present invention, the following excellent effects can be obtained. (a) Since harmful substances are less likely to dissolve out of the weight, there is no burden on the environment even when used outdoors for a long time. (b) Workability of attachment to the net surface is improved because the forming of the weight is facilitated. (c) Since the weight is easily elastically deformed, the net can be easily handled. (d) The weight of the weight can be easily adjusted according to the use of the net.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing a weighted net according to an embodiment of the present invention.

FIG. 2 is a partial plan view showing a weighted net according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Net with weight 12 Net surface 12a Hem part 13 Weight 14 Fixed thread

Claims (5)

[Claims] 1. A net provided with a weight on a net surface having a predetermined shape to support the net surface, wherein the weight is made of a composite resin material of a thermoplastic resin and tungsten powder. Weighted net. 2. The compounding ratio of the thermoplastic resin and the tungsten powder is 5/5 to 8/2 by weight.
Net with weight as described. 3. The weighted net according to claim 1, wherein the thermoplastic resin is a polyamide. 4. An average particle size of the tungsten powder is 50.
The weighted net according to claim 1, 2 or 3, which has a diameter of not more than μm. 5. The weighted net according to claim 1, wherein the weight is formed in a cord shape.