JPS5995836A - Knotless net for set net - 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 The present invention relates to a net fabric for stationary fishing nets knitted without knots.

The nets currently used as stationary fishing nets are raschel nets made by knitting any number of yarns made of synthetic fibers twisted to a desired thickness, or raschel nets made by knitting any number of yarns made of synthetic fibers, or yarns made of synthetic fibers twisted to a desired thickness. Knotless nets or twisted nets are knitted by twisting and combining 2 to 3 strands of twisted strands to a thickness of This is then made into knotted mesh fabrics.

By the way, fixed fishing nets are used to capture fish by intimidating, guiding, and forcing migratory schools of fish to catch fish by extending the net over a long period of time at a predetermined location in the sea. A large amount of shellfish and other deposits adhere to the net, and if left untreated, the tidal current resistance will increase and the netting will be blown away, and the effect of intimidating fish schools due to poor tidal flow will be lost. This not only causes the inability to catch fish, but also leads to serious accidents such as broken nets and misplacement.

For this reason, in fixed fishing, during the fishing period, nets with these foreign matter attached to them and which have grown roots are often pulled out of the sea.
In addition to drying and killing them, it is necessary to perform a so-called kumiko work to remove them by beating, and the cost and labor required for this is significant.

In view of this situation, the inventor conducted extensive research and found that the form in which diatoms, shellfish, etc. adhere to the net fabric and the roots expand is as follows.
Diatom spores and shellfish larvae first arrive and settle in the intertwisted gaps and braided gaps between the yarns or strands that are present in the net threads that make up the net fabric, and then take root within these gaps. We sought to grow while spreading and fixing, and based on this background, we used a rope made of twisted synthetic fibers or a plate made of braided fibers as the core body, and the outer periphery of the body was made of synthetic resin. A net fabric knitted from raw yarn for stationary fishing nets, which has a cylindrical coating layer formed on its outer periphery that gently reveals the irregularities of strand twists or knitting formed on the body. It has been found that by using this method, the adhesion and root expansion of these deposits can be significantly suppressed and prevented even during long-term use without causing any pollution, and this has already been disclosed in many prior applications.

However, although raw yarn for stationary fishing nets exhibits excellent practical performance in knotted nets such as knotted nets, nets used for box nets etc. exhibit excellent practical performance. Because the mesh is very fine, about 15 to 15α, and the net has good water penetration, and because of the frequent net-hauling operations, a lightweight net with little bulk is required. A knotless mesh fabric such as ground fabric is used. Even if the raw yarn for stationary fishing nets is used to knit raschel net fabrics or knotless net fabrics, the raschel net fabrics or knotless net fabrics have at least two or more yarns or strands organized or twisted together. Because the thread is constructed by
Twisted lines are inevitably formed between the raw yarns for fixed fishing nets, and spores and young larvae of gravel and shellfish (
There is a risk that the roots will spread and grow. For this reason, box nets using raschel netting or knotless netting still require the use of large amounts of harmful and dangerous algae-proofing agents, or require significant expense and labor to dry the nets. That's the reality.

The present invention has been made to solve this problem. It is made of synthetic resin or synthetic rubber and has a thickness of 50~
500μ, and a coating layer is formed on the outer surface that gently reveals the unevenness of the twists or braids of the yarns or strands formed on the mesh thread, making it possible to use it in the sea for a long time without any pollution. The object of the present invention is to provide a knotless net fabric for fixed fishing nets that can significantly suppress and prevent the accumulation of adhering substances such as diatoms and shellfish, as well as the spread of roots.

Embodiments of the present invention will be described below in detail based on the drawings. Figure 1 is an enlarged sectional view of the present invention using a knotless mesh fabric, in which the mesh yarn (1) is knitted using synthetic cellulose 41. It constitutes a raschel net, a knotless net or a twisted net,
The mesh yarn (1) in the raschel net fabric is formed by braiding together at least two yarns (IA) made by twisting synthetic fibers to a desired thickness, but it is knotless. The net yarn (1) in the net fabric or the threaded net fabric is the yarn (IA)
A desired number of strands are further twisted to form a strand F (IB), and 2 to 4 of the strands (IB) are twisted together to form a strand. The outer periphery of the mesh thread (1) is made of synthetic resin or synthetic rubber and has a thickness of 50 to 50 mm.
A covering layer (2) with a thickness of 500 μm and in which the twisted or braided unevenness of yarns or strands formed on the mesh yarn (1) are loosely exposed on the surface is formed. When forming this coating layer (2), a synthetic resin or synthetic rubber is dissolved in an organic bath agent, a solvent coating solution is used, or an emulsion is prepared by dissolving the synthetic resin or synthetic rubber in water. Although it is formed by dipping, spraying, or coating and then heating and drying to volatilize the solvent and water, in the present invention, a coating layer (2) is formed around the outer periphery of the net fabric (1). However, if the solvent coating liquid or emma/l/john coating liquid is diffused and penetrated by twisting into the inside of the mesh yarn α) as in general resin processing, the entire fabric will harden and become bulky. This not only impedes work during net hoisting, but also causes the intersections of the mesh to become stuck, impeding the deployment of the net during underwater use. Therefore, in the solvent coating liquid or emulsion coating liquid used in the present invention, it is recommended to use one with a relatively high viscosity of about 500 to 5000 voids in order to prevent diffusion and penetration into the mesh yarn (1). is required. Furthermore, in the present invention, net thread 0)
A solvent coating is attached to the mesh yarn (1) in order to gently expose the twisted or braided unevenness of the yarn (or strand (IB)) on the outer surface of the coating layer (2). This method takes advantage of the so-called thinning of the coating layer (2) by heating and drying the liquid or emulsion coating liquid to volatilize the solvent and water. It is preferable that the synthetic rubber component is composed of about 25 to 50% by weight, and the solvent or water to be volatilized is about 50 to 75% by weight. The thickness of the coating layer (2) formed around the outer periphery of the mesh thread (1) is determined by dipping or spraying or applying it onto the mesh fabric and heating and drying it to volatilize the solvent or moisture. If it becomes extremely thin, there will be a problem in abrasion resistance during use, while if it is made thicker than necessary, rigidity will be imparted and the flexibility of the fabric will be impaired.

Moreover, on the outer surface of the covering layer (2), the twist unevenness or the braided unevenness of the yarn (IA) or strand (IB) formed in the mesh thread (1) is made to appear gently. However, the diameter of the net thread (1) is approximately 1 to 3 mm in diameter for nets used for box nets, etc., but it varies widely from 5 to 8 mm for nets used for fence nets, etc. , and if the thread diameter is small, the yarn (I) constituting the thread (1)
A) or because the diameter of the strands (1, 8) is even smaller, the twisted or braided unevenness formed by twisting or braiding the yarns (IA) or strands (IB) is also It becomes extremely small, and the mesh thread (
It should be noted that if a thick coating layer (2) is formed on 1), the twisted or braided unevenness will be less likely to appear on the outer surface. For this reason, according to the inventor's experimental results for each thread, the diameter of the mesh yarn (1) is 05~]-,
50 to 80μ in the case of Ommφ, 80 to 200μ in the case where the net thread (1) has a minute diameter of 10 to 2.0 mrnφ, and when the minute diameter of the net yarn (1) is 20 to 4.0 mmφ. is 20
0 to 400μ, and the minute diameter of the net thread 0) is 40 to 8.0 m
In the case of rnφ, a thickness of about 500 μm is optimal for abrasion resistance, flexibility, and the appearance of twisted or braided unevenness.

Figure 2 shows the state of formation of the coating layer (2), and as is clear from Figure 2, the solvent coating liquid or emulsion coating liquid attached to the mesh yarn 0) is heated and dried. ,!
Since about 50 to 75% of the solvent or moisture of 1ll-f is volatilized, the thickness of the coating layer (2) is approximately 2 to 4 times the required thickness at the time it is attached to the net yarn (1). The thickness is approximately the same as that shown by the dotted line, and due to its viscosity, the cross section is approximately circular.

Since 50 to 75% of the solvent or moisture is volatilized by heating and drying, so-called thinning occurs due to volatilization shrinkage, and the solvent coating liquid or emulsion coated gradually in the twist 1 concave part or the braid concave part Bli (2A). /fL solidifies while volatilizing and shrinking along the twist 1 concave part or braid concave part (2A), and loosely forms yarn (IA) or strand (IB) twist unevenness or braid unevenness on its outer surface. A coating layer (2) is formed which appears on the surface.

When forming the coating layer (2), if sufficient flexibility is to be imparted to the product of the present invention, a solvent coating solution or an emulsion coating solution made of polyurethane resin or synthetic rubber is applied to the coating layer (2) to ensure sufficient abrasion resistance. For this purpose, a solvent coating solution or an emulsion coating solution using vinyl, polyester thread, or polyamide synthetic resin is suitable.

The present invention has the above-mentioned configuration, and the present invention applies synthetic resin to the outer periphery of the net threads of a knotless knitted fabric such as a raschel net, a knotless net, or a screw net. Young L
< is made of synthetic rubber and has a thickness of 50 to 500 μm, and its outer surface has a coating layer in which the twisted unevenness or braided unevenness of yarn or strand formed in a mesh yarn is gently exposed. Not only is it non-polluting when used underwater, but it also has no anchoring site for diatoms, shellfish, etc., and it is impossible for the roots to spread, so even during long-term use, these deposits do not grow. The fishing effect is significantly improved, with good tide flow and good net formation. Furthermore, since the outer surface of the coating layer has loosely uneven twists or braids of yarns or strands formed on the net yarn, the netting operation is not carried out without being pinched with a roller such as a net hauler. This not only prevents slippage of the net and improves the workability of lifting the net, but also allows the net to drain extremely well when lifting the net, reducing the work force required to lift the net to an absolute minimum. becomes. However, in the present invention, since the covering layer is formed in the form of a film around the outer periphery of the mesh yarn, it has excellent flexibility and is flexible due to its thickness and the characteristics of the selected synthetic resin or synthetic rubber. Not only does it have excellent properties, but it also has extremely good ability to deploy underwater. Historically, in the present invention, the knotless net for fixed fishing nets has many features, such as being able to prevent the chain of broken nets seen in knotless net fabrics and twisted net fabrics, since the coating layer is also formed at mesh intersections. It is the earth.

[Brief explanation of drawings]

Figure 1 is an enlarged IDr side view of the present invention using knotless mesh;
FIG. 2 is an explanatory view showing the state of coating layer formation, and FIG. 3 is a sketch of the present invention. Explanation of symbols (1) ...Net yarn (IA) ...Yarn (IB) ...Strand (2) ...Coating layer (2A) ... ...Patent applicant for twisted 9-stitch recessed part or knitted recessed part Tokutabu Komuro Procedures Amendment March 28, 1981 [Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case 1988 Patent application No. 205100 2, Title of invention: Knotless net for fixed fishing nets 3 Amendment date of Nagisa 4 amendment order Voluntary amendment 5 No increase in number of inventions due to amendment 1) Specification, page 8, line 7 F... "By volatilizing the solvent or water" is corrected as follows. "As the solvent or moisture is volatilized..." (2) Page 8, line 14 of the specification, "Make the irregularities of the braided F loose." should be corrected as follows. (3) Specification page 12, line 6 [...It is a mesh fabric. ” and then add the following phrase: Experimental example: A knotless net fabric with a mesh diameter of 15 yarns and 30 yarns was made by twisting 36 Tetron 250D yarns, and the knotless fabric was coated with a solvent coating solution containing 30% polyvinyl chloride resin and 70% toluene. A knotless net fabric formed by immersing it in a cloth and drying it to form a coating layer of an average thickness of 85μ around the outside of the net yarn, and polyvinyl acetate resin 42
Knotless net fabric 3, which is immersed in the emulsion coating solution and dried to form a coating layer with an average thickness of 71μ around the outer circumference of the net threads.
The following table shows the results of a survey of the types of diatoms and shellfish (=1) that were spread out at a depth of 10 to 15 mK off the coast of Manazuru, Sagami Bay for about 8 months. 10 days *The numerical value is the amount of wear of the net fabric (m' to υ) (2) *Measurement method: At each measurement time, 3 l' of each test net fabric was pulled up, and after 24 hours of natural drying, 11 nets in a stuck state were collected. It was determined by measuring the net weight and subtracting the net weight of the net.As is clear from the above experimental examples, the knotless net for fixed fishing nets according to the present invention does not attract diatoms and shellfish even during long-term use in the sea. It was found that the adhesion of siliceous algae and shellfish was significantly suppressed in the initial stage, especially when immersed in a solvent coating solution, even on important areas coated with PVC resin, compared to knotless mesh fabrics with no coating layer. However, it is observed that the amount of adhesion increases rapidly over the course of approximately 3 months of use.This is because the coating layer formed by the emulsion coating liquid is dissolved in seawater over the course of underwater use, and the coating layer gradually disintegrates. It is presumed that this is due to the results obtained, and the fact that the amount of adhesion is higher than that of knotless net fabrics on which a polyvinyl chloride resin coating layer is formed using a solvent coating solution even in the initial stage is due to the moisture absorption of the polyvinyl acetate resin itself. Characteristic (water absorption)
As a result, the outer surface of the coating layer is roughened and many micropores are formed due to moisture absorption, which increases the settlement of fine spores and infants such as gravel and microorganisms. It is judged that this is due to the growth of these things. In the case of the uncoated knotless net fabric, the entire mesh is obstructed by debris after about 60 days of use, and it is essentially unusable. ” 194-

Claims (1)

[Claims] ■The outer periphery of the knotless knitted net yarn is made of synthetic resin or synthetic rubber, and its thickness is 50 to 500.
A knotless net fabric for a set fishing net, characterized in that a coating layer is formed on the outer surface of the yarn or strand, which is made of μ and has a loosely exposed twist or braid unevenness formed on the net thread. ■ A solvent coating liquid with a viscosity of 500 to 5000 voids and a synthetic resin or synthetic rubber dissolved in an organic solvent in a proportion of 25 to 50% by weight, or an emulsion coating liquid in which the synthetic resin or synthetic rubber is suspended in water. Claim 1, which is obtained by evaporating the solvent or moisture by dipping the fabric or spraying or coating it on the fabric and then heating and drying it, thereby forming a coating layer around the outer periphery of the fabric. Knotless net fabric for fixed fishing nets as described in .