JPH0232705Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(a) Industrial application field The present invention relates to a core body of yarn for knitting fishing nets, in which a coating layer is formed on the outer peripheral surface. (b) Prior art The net material for fishing nets is made by twisting synthetic fibers having the required physical properties into yarn, or by further twisting the required number of yarns to form strands or twines, and then by twisting these yarns into strands or twines. Because it is formed by ratchet knitting, knotless knitting, or knotted knitting,
On the thread surface of the net fabric, there are many fine gaps between the synthetic fibers, as well as relatively large gaps between yarns and strands. By the way, fixed nets and aquaculture nets are spread over a long period of time in a predetermined location in the sea, so they can collect spores and young buds of silica and seaweeds, zoospores and juveniles of fish and shellfish, etc., which are floating in extremely large quantities in the sea. The roots settle in the gaps that appear on the thread surface of the net fabric, and the roots easily spread and become fixed in the gaps between the strands, causing them to grow and enlarge in a short period of time, resulting in the inability to catch fish due to blowing in fixed nets. Accidents such as broken nets and shifting of fixed facilities occur due to increased resistance to water and tidal currents.Furthermore, in aquaculture nets, tidal passage is obstructed, resulting in poor growth of aquaculture fish and shellfish, as well as the discharge of feed residue and feces outside the net. Because this could lead to disease outbreaks and fatal accidents, it was necessary to perform frequent screen changes. As a countermeasure against this problem, algae-proofing agents or anti-fouling agents containing heavy metals as medicinal ingredients have been applied to the net fabric for a long time, but recently, because of the large amount of marine pollution caused by the elution of heavy metals, Measures have been taken to ban their use in aquaculture fisheries. The inventor tackled this problem from an early stage and conducted extensive research. By knitting a net fabric using raw threads with a smooth coating layer formed on the outer circumferential surface of a core made of synthetic fibers, the inventor was able to improve the net yarn surface. The fine gaps between the synthetic fibers and the relatively large twisting gaps between the yarns and strands are hidden, making it non-polluting and safe to handle, and preventing the adhesion of silica, seaweed, shellfish, etc., and their growth and enlargement. We have sought to prevent this problem, and have already disclosed its contents in many patent applications such as Patent Publication No. 58-32569 and inventions. (c) Problems to be solved by the invention By the way, the fishing net knitting yarn having the coating layer disclosed in these earlier inventions and inventions is particularly required to be strong and flexible in terms of its usability. When forming the core, it is necessary to select a synthetic fiber having sufficient strength and flexibility, and therefore fine-grained synthetic fibers such as polyester, polyamide, or polyolefin are used. On the other hand, the coating layer formed on the outer circumferential surface must be made of a sufficiently flexible material and thin enough so as not to impair the flexibility of the core, and the coating layer must have a smooth surface for performance reasons. In addition, since water resistance, weather resistance, and abrasion resistance are required, the materials used are limited to soft polyvinyl chloride resin, polyvinylidene chloride resin, copolymer resins thereof, synthetic rubber, etc. Since it was relatively easy to form the core to a uniform thickness, in the early days the coating was formed by extruding the coating layer in a cylindrical shape around the outer circumference of the core using the melt extrusion method. It is something. However, in the raw yarn for fishing net knitting having such a structure, the core material and the covering layer material have no chemical adhesion or so-called compatibility, and the covering layer is materially more fragile than the core material. Because it is formed into a thin wall, the core and coating layer will peel off extremely easily if tension or contact friction is repeatedly applied during use, and this peeled portion will resist the tension or contact friction. Not only does this result in a significant loss of product value, but the torn portion becomes a place for silica, shellfish, etc. to adhere, resulting in increased growth and enlargement. Therefore, when forming the coating layer, the material forming the coating layer is made into a low-viscosity coating liquid in the form of an aqueous solution, so-called emulsion or solvent solution, and the core is immersed in the coating liquid to penetrate and diffuse into the interior of the coating liquid. Moreover, by curing, the formed coating layer is integrally entangled and fixed to the inside of the synthetic fibers inside the core, and physical adhesion can be achieved.
A so-called dip coating formation method has been proposed. However, even with this method, the synthetic fibers used to form the core are usually multi-threads of about 250 denier/48 filaments in the case of polyester synthetic fibers, and the fineness of the single fibers is It is extremely thin, only about 5 denier, and is made of a very large number of such fine fibers bundled and twisted, so even if a low viscosity coating liquid is used, it will not penetrate sufficiently into the inside. Not only does it form a coating layer that does not have physical adhesion, but even if the coating liquid penetrates and diffuses into the core, when it cures,
Since the solvent such as water and solvent in the coating liquid is first evaporated or volatilized from the outer surface, that is, the outer surface of the coating layer, and solidified, the solvent in the part of the core where curing is delayed cannot evaporate or volatilize to the outside. As a result, the physical adhesion of the coating layer is significantly reduced, and the toughness of the coating layer itself is also impaired, as a large number of bubbles form inside the coating layer whose outer surface has been solidified. I had a huge problem with my sexuality. (d) Technical means to solve the problem The present invention was developed in view of the above problem, and the present invention is based on a method in which the core of the raw yarn for fishing net knitting having a coating layer and the coating layer are chemically and physically strong. The purpose is to provide a core body that can be bonded to the core body and form a strong coating layer at a low cost. Synthetic fibers are used, and a synthetic rubber solution is applied and cured to fill the gaps between the single yarns of the synthetic fibers with the synthetic rubber, and the entire single yarn is also wrapped to form a synthetic rubber-coated yarn. Then, the required number of synthetic rubber coated threads are aligned and bundled into a circular cross section to match the required core diameter, or heated slightly in one direction while being aligned, and each synthetic rubber coated thread is heated slightly in one direction. In addition to integrally joining the synthetic rubber surfaces of the yarn,
The purpose is to appropriately vulcanize and fix the material to form a core. (e) Operation The present invention using the above-mentioned technical means functions as follows. In other words, a synthetic rubber solution is coated on a general synthetic fiber that is untwisted and has a relatively small number of single yarns wound around a bobbin or cheese while being untwisted from the bobbin or cheese. It is easily penetrated and diffused into the mutual gap, and since the entire synthetic fiber is thin, curing can be done relatively uniformly and quickly on both the outside and inside. Then, by curing, a synthetic rubber-coated yarn is formed in which the synthetic rubber fills the gaps between the single yarns and also wraps the entire single yarn, and since the synthetic rubber has both flexibility and elasticity, the synthetic rubber is made of synthetic rubber. It can fully accommodate its own flexibility and flexibility. Furthermore, since synthetic rubber retains its adhesive properties even after curing, the required number of synthetic rubber-coated threads wrapped with such synthetic rubber are drawn and focused to have a circular cross-section corresponding to the diameter of the core. By heating slightly in one direction while aligning or aligning them, the respective synthetic rubber surfaces are integrally joined to form a core whose cross section is approximately circular, and during this joining, The synthetic rubber material deforms and flows in response to the focused stress due to its viscoelasticity, sealing the gap created between each synthetic rubber-coated thread, creating a core with virtually no internal voids. is formed. In addition, in the present invention, the core is formed in an almost untwisted state using synthetic fibers whose elongation at break is at least 20%, so the elongation of the core is also a direct reflection of the synthetic fiber object. Since twisting of yarns, strands, etc. is omitted, the strength utilization rate is extremely high. Furthermore, the synthetic rubber exposed on the outer peripheral surface of the core has higher chemical adhesion than the synthetic fiber material selected for the core, and the exposed synthetic rubber is significantly toughened by hot water flow and is vulcanized. As a result, the outer surface becomes rougher, resulting in an increase in the physical adhesion area. (f) Examples Examples of the present invention will be explained below based on the drawings. Figure 1 is a cross-sectional view of synthetic fibers, Figure 2 is a cross-sectional view of synthetic rubber coated yarn, and Figure 3 is a diagram showing the formation of the present invention. Fig. 4, which is an explanatory diagram of the method, is a cross-sectional view of the core of the present invention, and since the physical properties of the synthetic fiber 1 to be used are directly utilized, it is particularly suitable for the conventional twisted core as raw yarn for knitting fishing nets. Since the elongation at break cannot be expected, it is important to select a material whose elongation at break is at least 20% or more, preferably about 30 to 50%, and the synthetic fiber 1 is also required to have strength and flexibility. Naturally, fine-grained polyester, polyamide, or polyolefin fibers are mainly used due to the nature of the material, but even in the case of multi-filaments, it is preferable to use fibers with a small number of single fibers and as thick a single fiber as possible in the synthetic rubber solution. This is desirable in terms of permeation diffusion and curing in a short period of time. The synthetic rubber solution 2 is applied to the thus selected synthetic fiber 1 while being unwound from the wound bobbin or cone A.
The synthetic rubber materials for this synthetic rubber solution 2 include styrene-butadiene rubber, butadiene rubber, isoprene rubber, acrylonitrile-butadiene rubber,
Examples include chloroprene rubber, acrylic rubber, urethane rubber, silicone rubber, etc., and these synthetic rubber materials are dissolved in a latex form using water as a solvent, or in an organic solvent such as toluene, methyl ethyl kettle, hexane, etc. to the required viscosity. Although it is prepared as a solution, it is more convenient to use an organic solvent as the solvent because it needs to cure in a short time in a continuous production process. The viscosity of the synthetic rubber solution 2 varies depending on the coarse density of the inter-filament gaps 1A of the synthetic fiber 1 and the amount of coating, but in the case of synthetic fibers of about 250 denier/48 filaments, it is approximately 50 to 300 ep ( It has a good viscosity of about centipolaz. Further, in the synthetic rubber solution 2, a synthetic rubber substance 2A which is cured after coating, fills the inter-filament gap 1A of the synthetic fiber 1, and wraps the entire single thread is finally vulcanized, and the A vulcanizing agent and a vulcanization accelerator are mixed in to strengthen the material and to form a strong coating with the coating layer. This vulcanizing agent varies somewhat depending on the synthetic rubber material, but generally powdered sulfur, organic sulfur compounds such as tetramethylthiuram disulfide, organic peroxides such as dicumyl peroxide, metal oxides such as magnesium oxide, and Examples of vulcanization accelerators include aldehyde-amines such as hexamethylenetetraamine (CH ₂ ) ₆ N ₄ and dithiocarbamates such as selenedithiocarbamate.

Examples include [Formula]. The amount of these vulcanizing agents and vulcanization accelerators varies depending on the vulcanization conditions and degree of vulcanization, but the amount of vulcanizing agents and vulcanization accelerators is approximately 2 to 3% of the weight of the synthetic rubber material. In the case of a sulfur accelerator, it is mixed at a level of about 1% or less. As a method for applying such a synthetic rubber solution 2, synthetic fibers 1 are placed in a solution tank B of the synthetic rubber solution 2.
It is convenient to pass the coating through dipping or to apply it using a coating roll. The synthetic fiber 1 coated with the required amount of the synthetic rubber solution 2 is then passed through a heated drying zone C to perform so-called curing to evaporate or volatilize the water or organic solvent that is the solvent of the synthetic rubber solution 2. As a result, the solvent component is evaporated and volatilized, and the solute component, the so-called synthetic rubber substance 2A, is filled in the inter-single yarn gap 1A, and the synthetic rubber-coated yarn 3 is formed in a state in which the entire single yarn is wrapped. It should be noted that curing in such cases is aimed at the evaporation or volatilization of the water or organic solvent as a solvent, and that the curing is carried out under conditions that minimize the effect of the vulcanizing agent or vulcanization accelerator. .
By aligning and converging the thus formed synthetic rubber-coated threads 3 into a circular cross section in the required number corresponding to the diameter of the core, or by slightly twisting them in one direction while aligning them. , each of the synthetic rubber-coated threads 3 is focused and pressed together into a circular cross-section,
Synthetic rubber material 2 wrapped with synthetic rubber coated thread 3
Due to the adhesiveness of A, the synthetic rubber 2A surfaces of each synthetic rubber coated thread 3 are integrally joined. Following this bonding, a suitable heating treatment D is carried out, and a vulcanizing agent and a vulcanization accelerator are applied to the synthetic rubber material 2A.
The core body 4 is created by performing the required vulcanization 2B. The heating treatment conditions for vulcanization vary depending on the composition of the synthetic rubber material, vulcanizing agent, and vulcanization accelerator, but styrene-butadiene rubber with 2% sulfur and zinc oxide vulcanizing agents and thiuram vulcanizing agents are used. When 0.8% of sulfur accelerator is mixed, the standard heating treatment is 150-180°C for 15-30 minutes. (g) Effects of the invention The present invention has such a technical configuration, and since the core is formed by gathering synthetic fibers in a substantially untwisted state, there is no need for yarn or strand processes, and production is simplified. Not only is the strength significantly improved, but there is no loss of twist due to twisting, and the strength utilization rate is also greatly increased.When forming a core of the same strength, the amount of synthetic fiber used is significantly reduced, making it extremely cheap, as well as improving the physical properties of synthetic fibers. Since this can be directly reflected, it is easy to design the physical properties of the core, and by using synthetic fibers with the required breaking elongation in advance, it is possible to maintain the elongation required for raw yarn for fishing net knitting. In the present invention, since the synthetic rubber solution is applied at the stage of synthetic fibers, it easily permeates and diffuses into the gaps between the single yarns, and by curing, the synthetic rubber solution is filled into the gaps between the single yarns. Since the entire thread is wrapped to form a synthetic rubber-coated thread, the internal gaps of the synthetic fibers are sealed, and the required number of synthetic rubber-coated threads are aligned or bundled into a cross-sectional shape. By slightly twisting in one direction, the synthetic rubber that wraps the outer surface of each synthetic rubber-coated thread bonds with its adhesiveness, and due to its viscoelasticity, the gaps involved in the bonding are also subjected to stress deformation. Since the core is sealed and sealed, there are no internal voids as a whole, and a core with a substantially circular cross section is formed.As vulcanization progresses, the synthetic rubber on the outer surface of the core becomes extremely tough. At the same time, the outer surface is roughened, which significantly increases the physical adhesion area, and combined with the chemical adhesion of synthetic rubber, it is possible to achieve strong adhesion with the coating layer. Since there are no voids inside the body, even if the coating layer is formed by dipping, curing or vulcanization can be performed quickly without generating bubbles, and a coating layer with excellent durability can be formed. It can be said to be the core body of raw yarn for knitting fishing nets, which has a coating layer with many unique characteristics.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of synthetic fibers, Fig. 2 is a cross-sectional view of synthetic rubber-coated yarn, Fig. 3 is an explanatory diagram of the forming method of the present invention, and Fig. 4 is a cross-sectional view of the core of the present invention. . Explanation of symbols, 1...Synthetic fiber, 1A...Gap between synthetic fiber single yarns, 2...Synthetic rubber solution, 2A...
Synthetic rubber, 3... Synthetic rubber coated thread, 4... Core.

Claims (1)

[Scope of utility model registration request] Synthetic rubber-coated yarn made by applying a synthetic rubber solution to synthetic fibers with a breaking elongation of at least 20% or more and curing them, so that the gaps between the single yarns are filled with the synthetic rubber and the entire single yarns are wrapped. The required number of threads are aligned and condensed into a circular cross-section, or heated slightly in one direction while being aligned, and the synthetic rubber surfaces of each synthetic rubber-coated thread are integrally joined. A core body of raw yarn for knitting fishing nets having a coating layer formed by vulcanization and fixation.