Polyurethane composite panels in the international arena has been used as the main material for steel building envelope polymer polyethylene sheet, widely used in large industrial plants, cold storage, garages, mobile homes, exhibition halls, stadiums, shopping centers, airports, power plants, villas, hospitals, high-rise office buildings and other areas of the formation and its excellent insulation properties are mainly used in industrial and civil roofing and siding. Good thermal insulation: automatic compacting Bumian by long double track control precision molding compound made of cotton compared with conventional hanging envelope materials, better insulation performance is more durable, easy to install, elegant appearance. Rockwool low thermal conductivity (λ = 0.043w / m · k), good insulation properties. Excellent node design supply polyethylene sheet, to ensure the sealing performance and the insulation effect. The advantages of polyurethane sieve polyurethane sieve is a kind of polyurethane raw materials to produce polyurethane products Buying polyethylene sheet, porous sieve have slit, rectangle, circle, etc., has excellent abrasion resistance, oil , hydrolysis resistance, fungus, anti-aging properties, can be used in coal preparation plant, coking plants, mines, power plants,