product quality supervision

quality checks of the safety net brief safety belt webbing
Special labor protection products (1) safety net involving state property and personal safety, product quality supervision and inspection department designated by the National inspected and obtained the production license only after the production. Each batch of a safety net factory, must have supervision and inspection department inspection reports. Each safety net should be in a different location, attach national supervision department inspection certificates and corporate self-test certificate. Should signage, signs should be permanent signs, signs should include: name of manufacturer, date of manufacture, batch number, material specifications, weight and produc tion license number. (2) The safety net is divided into a flat screen (P), Legislative Network (L), dense mesh-style safety net (ML). The safety net is mainly composed by the the edge rope, tether, tendon rope, net rope. Constitute a the Fine Mesh safety net mesh buckle, side ropes and additional tether. The physical and mechanical properties of the safety net, is to distinguish the key indicators of the quality of the merits of the safety net. Include: side ropes, tethers, net rope, tendons rope breaking strength. The Fine Mesh safety net: the breaking strength, elongation at break, seams tensile strength, tear strength, penetration resistance, fracture strength retention after aging, opening the eyes buckle strong tail flame retardant properties. Flat screen and vertical networks should have the impact resistance. Established network is not a substitute for the flat screen, flat screen Legislative Network should be based on the construction needs and load height to disting uish. Flat screen greater than the established network load strength requirements and more, the materials used, the weight is greater than the established network. Normal circumstances, the flat screen is more than 5.5kg, the legislature greater than 2.5kg. (3) The safety net is mainly the use of open workplace. So, you must have the weather resistance. With a weather-resistant material nylon, polyvinyl alcohol, and polyester. With a net materials used should be the same, its wet and dry strength ratio should be greater than 75%, each net total weight does not exceed 15kg. Retardant safety net continued burning, smoldering time shall not exceed 4s. (4) flat screen width of not less than 3m, established network and dense mesh-style safety net width of not less than 1.2m. The tether length not less than 0.8m. Tether and tether pitch of the safety net should not be greater than 0.75m. Dense mesh-style safety net tether and tether spacing should not be greater than 0.45m, the di stance between the safety net tendons rope shall not be too small, the general provisions of more than 0.3m. The safety net can be divided into hand-plaited and mechanical plaiting. Mechanical plaiting can be divided into a knot plaiting and knotless plaiting. General knotless mesh knot strength than webs knot strength. Net knot and section head must be firmly fixed, can not be moved, to avoid mesh to increase and uneven side length. Such a situation will lead to stress concentration until the net rope breaking.seat belt buckle