Method for testing strength of diamond polyamide warp knitting net sheet for net cage

Abstract

The invention relates to a testing method for strength testing of nettings, in particular to the strength testing method for rhombus mesh polyamide warp knitting nettings used for net cages. The invention comprises a netting sample and a testing type and is characterized in that samples are gained at positions 10 meshes away from the edge of the netting; the effective working dimension of the sample is corresponding used for mesh strength test or netting breaking strength and breaking elongation test; the end of the cutting edge foot of the sample is melted; the dry sample is wetted for 12 hours and the wet sample is dipped for 12 hours; a clamp used for measuring the mesh strength is provided with a stainless steel hook or wire ring; tension force is pre-acted on the sample; the strength index is recorded and calculated by a recording device of the testing machine; the testing machine used for testing the netting breaking strength and the breaking elongation is provided with a flat clamp which is more than 10cm wide; the sample where the tension force is pre-acted is clamped into the clamp; the sample indexes of breaking strength and breaking elongation are recorded and calculated in the recording device of the testing machine; the effective measuring time of the test is not less than 20. The method of the invention is used for testing the strength performance of the warp knitting netting.

Description

Technical field: [0001] The invention relates to a method for detecting the strength of polyamide warp-knitted nets with rhombus mesh used in cages. Background technique [0002] Mesh is the main material in fishery production, and it is widely used in fishing and breeding projects. Mesh can be divided into polyamide mesh, polyethylene mesh, polypropylene mesh and polyester mesh according to the type of fiber material used for weaving; according to the presence or absence of network knots, mesh can be divided into knotless mesh and There are two types of knotted mesh; knotless mesh is divided into warp knitted mesh, inserted twisted mesh, flat woven mesh, twisted twisted mesh; knotted mesh is divided into slipknot mesh, dead knot mesh, double Dead knot mesh. Diamond mesh polyamide warp knitted mesh is a kind of knotless mesh. It has good impact resistance, fatigue resistance and seawater corrosion resistance. The more common netting material. Due to the existence of nodu...

AI Technical Summary

Problems solved by technology

This has brought difficulties to farmers in selecting cage netting materials, and there have also been disputes between manufacturers and users due to inconsistent quality indicators

Because the net material of a net cage is only worth tens of thousands of yuan, but the value of a net cage of fish is more than hundreds of thousands of yuan. Once the net is broken, the farmers will suffer heavy losses.

This not only brings hidden dangers to fishery production, but also restricts the sustainable and healthy development of fishing and fishery engineering

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