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一、拖网渔具的材料和设计制造 1.日本用作制造拖网的网具材料不论是沿岸拖网、外海拖网,或单船拖网还是对拖网,基本上选用低压聚乙烯为原材料。仅少数远洋拖网工船采用尼龙纤维,而在欧美,用于拖网的材料则多数选用后者。日本渔用聚乙烯单丝一般为380—400但尼尔(42—44Tex),略粗于我国标准丝(36Tex),强力约为5克/但,断裂伸长率在10％左右。在日本,选用乙烯作拖网材料的理由大体是:①具有足够的强力要求;②有适度的坚韧度和挺度,不用树脂处理;③定型容易,网结不松脱;④不吸水,抗腐性好,易
I. Trawl gear materials and design and manufacturing 1. Japan used to manufacture trawl network materials Whether trawlers along the coast, sea trawling, or single boat trawling or trawl, basically use low-pressure polyethylene as raw material. Only a few offshore trawlers use nylon fibers, while in Europe and America the majority of materials used for trawling use the latter. Japanese fishing polyethylene monofilament is generally 380-400 denier (42-44Tex), slightly thicker than our standard wire (36Tex), a strong about 5 grams /, but the elongation at break of about 10%. In Japan, the reason for using ethylene as trawl material is generally: ① sufficient strength requirements; ② moderate degree of toughness and stiffness, without resin treatment; ③ stereotypes easy, mesh knot does not loosen; ④ non-absorbent, anti-corrosion Sex is good, easy