Method for measuring physical properties of polyethylene plain net for fishing
A technology of physical properties and measurement methods, applied in textile testing, measuring devices, strength characteristics, etc., can solve hidden dangers in fishery production, inconsistencies in physical indicators between production plants and farmers, and restrict the sustainable and healthy development of aquaculture projects, etc.
Inactive Publication Date: 2011-04-06
EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI
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Problems solved by technology
This has brought difficulties for farmers to choose polyethylene flat woven mesh materials for breeding, and there have also been cases of disputes between production plants and farmers due to inconsistent physical indicators
Because the value of the polyethylene flat woven mesh material used for breeding does not account for a high proportion of the entire breeding cost, but the value of the breeding objects is considerable. Once the net is broken, the farmers will suffer heavy losses and bring hidden dangers to fishery production. , restricting the sustainable and healthy development of aquaculture projects
Method used
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specific Embodiment approach
[0015] During the physical performance test of the fishing polyethylene plain woven mesh, the atmospheric conditions in the laboratory are controlled at temperature (20±2)℃ and humidity (65±2)%;
[0016] The sample must meet the requirements of dry state and wet state. The dry state sample shall be adjusted and balanced for at least 18h under the atmospheric conditions of temperature (20±3)℃ and humidity (65±3)%; ±3) ℃ in the container for at least 18h, to achieve no significant difference in the tensile strength and breaking elongation of the mesh after the immersion for a longer time. In order to completely wet the sample, you can also add no more than 0.05% Ionic neutral wetting agent;
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Abstract
The invention discloses a method for testing the physical properties of a fishery polyethylene plain mesh, relating to testing the properties of a plain mesh, and a method for testing the physical properties of the fishery polyethylene plain mesh is provided. The method includes sampling, cutting, damping balancing and physical property testing, and the sample is obtained on the mesh more than 20cm from the brim; over forty 1000mm single threads are sampled; more than 20 pieces of 350mmX50mm are cut off from the mesh to serve as samples; 20 pieces of 100mmX100mm samples are cut; the dry samples are damping balanced under 20 DEG C and 65 DEG C for 18 hours, and the wet samples are soaked in the water (20 DEG C) for 18 hours. The sample clipped between the flat tongs arranged on the single-thread heavy-duty testing machine is 500mm long; the distance between the gongs for mesh testing is 200mm, the sample is stretched under mean rupture time of (20 plus and minus 3)s till rupture; the effective testing frequency is not less than 20 times. The method is applicable to testing the physical properties of any plain mesh.
Description
Technical field: [0001] The invention relates to a method for measuring the physical properties of a polyethylene plain woven mesh sheet for fishing. Background technique [0002] Due to the presence of nodules in the fishing knotted netting, the weight of the net is heavy and inconvenient to use. The protruding nodules are easy to scratch the surface of the fish or fry, causing the surface of the fish to be infected and cause fish diseases. [0003] Polyethylene flat woven mesh for fishing is a kind of knotless mesh. It has the advantages of low price, simple structure, good water filtration performance, and flat and smooth surface. It is different from knotted mesh and is suitable for pond or rice field shrimp and crab. Escape prevention fences, whitebait fishing nets, freshwater fish fry breeding net cages, offshore shellfish breeding net cages, cage breeding fish catching nets, shellfish breeding cages and agricultural insect-proof nets. [0004] In recent years, due to the decl...
Claims
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IPC IPC(8): G01N3/00G01N1/04G01N33/36G01B21/00
Inventor 石建高王鲁民
Owner EAST CHINA SEA FISHERIES RES INST CHINESE ACAD OF FISHERY SCI