Preparation method of ultra-high molecular weight polyethylene monofilament knotted fishing net

Abstract

The invention discloses a preparation method of an ultrahigh molecular weight polyethylene monofilament knotted fishing net. The preparation method comprises the following steps: performing melted extrusion on ultrahigh molecular weight polyethylene raw materials by using an extruding machine; cooling the extruded melt and pre-stretching the melt under the action of a drawing roller; putting initial raw filaments which are formed by cooling into a stretching machine to be subjected to three-stage stretching so as to prepare ultrahigh molecular weight polyethylene monofilaments; reeling monofilament fiber on a reeling machine; weaving the reeled monofilaments into a fishing net on a knotted net weaving machine; performing follow-up treatment and other steps on the woven fishing net, wherein nanometer molybdenum disulfide and nano-graphite are added into the ultrahigh molecular weight polyethylene raw materials. According to the preparation method, the process flow is short; the fiber processing cost is low; the prepared ultrahigh molecular weight polyethylene monofilament knotted fishing net can effectively resist impact of wind wave and large predators, prolongs the service life of meshes and reduces the attached amount of marine organisms.

Description

technical field [0001] The invention relates to a method for preparing a monofilament fishing net, in particular to a method for preparing an ultra-high molecular weight polyethylene monofilament knotted fishing net. Background technique [0002] At present, the fishing nets used in fishery are mostly woven from nylon and polyethylene fibers, and the multifilament fishing nets used in cage culture. The widely used mesh weaving technologies include: knotted mesh, which is divided into slip knot, dead knot and monofilament knot, etc.; knotless mesh, which is divided into warp knitted mesh, twisted mesh, braided mesh, etc. . [0003] Due to the large number of gaps in the multi-filament mesh, with the increase of the use time of the net, a large number of filamentous algae, such as Spirogyra, Double Star algae, Rotten algae, etc., will be fixed between the gaps of the multi-filament mesh, such as high-pressure water gun flushing, etc. It is difficult to remove it effectively ...

AI Technical Summary

Problems solved by technology

When the mesh is damaged, the damaged part of the net will expand, and it will easily lead to large economic losses when used in cage culture.

In addition, due to the high price of knotless fishing net weaving machines, the price of knotless woven mesh is significantly higher than that of knotted mesh

[0005] In short, regardless of whether multi-strand monofilaments or multifilaments are used to directly weave fishing nets, there are common phenomena such as slack wires and many surface burrs. In marine cage culture, seaweed is easy to attach and cause mesh blockage.

Moreover, the multiple twisting of the network wire will inevitably lead to a large loss of fiber strength and low fiber strength utilization.