HDPE,external,protecting,tube, business, insurance HDPE external protecting tube all-around analysis
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High density polyethylene (HDPE) external protecting tube is mainly used in prefabricated directly buried insulating carbon steel pipe external anti-corrosion, with such advantages as high strength, good toughness, anti-aging, environmental stress cracking resistance and thermal insulation layer (rigid polyurethane foam) and good combination.Winter the development of prefabricated directly buried insulating pipe in the heating area of north China, HDPE external protecting tube production technology and industry get rapid development.Because of the simple production process of HDPE external protecting tube, the manufacturer is more, but the quality of the good and bad are intermingled, mainly exist the following problems: thin polyethylene outer shield wall, low density, compressive strength is not up to standard, easy to result in insulation damage; No corona processing technology, external protecting tube and thermal insulation layer low bond strength, integrity is poor.1.production equipment and processing technology(1) production equipmentHdpe external protecting tube main production equipment are plastic extruder, tractor, air compressor and sealing.Plastic extrusion machine is used for thermoplastic, polyethylene plastic products or semi-finished products processing. Tractors to hdpe external protecting tube made of plastic extruder head uniform derivation, form the finished product.Air compressor and angry machine keep HDPE external protecting tube inside a certain air pressure, easy to finalize the design.(2) processing technologyHdpe external protecting tube plastic extruder to PE extrusion processing technology. Extrusion molding generally divided into plasticizing, mouth shape, curing qualitative three stages. After pretreatment of raw materials, through feeding device into the plastic extruder hopper, within a reasonable barrel temperature, screw speed, the raw material of uniform plasticizing extruder. Molten material and installation of qi activity and corona device in advance of tube after the firm bonding of sizing set inside, use tractors to uniform its derivation, forming high temperature tube billet. Heat pipe for cooling in the cooling water tank, the air compressor to tube filling, and sealing and down closed tube pipe pressure. Finished product protection pipe is cut into section according to the length requirement. Extrusion can be continuous, with automatic production, high production efficiency and stable product quality.2.technical standardsHDPE external protecting tube product standards for the CJ/T114-2000 the HDPE external protecting tube polyurethane foam plastic, prefabricated directly buried insulating pipe.
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