Its development is very rapid, 80 years ago, the world average annual growth rate of 8.5%, after the 1980s, the growth rate as high as 15% to 20%. Moreover, China's average annual growth rate of over 30%. World consumption in 1978 was 12,000 - 12 UHMWPE pad factory, 500 tons of ultra-high molecular weight polyethylene pads, and by 1990 world demand of about 50,000 tons of UHMWPE pad processing, which the United States accounted for 70%. UHMWPE molding: special. Lubrication extrusion (injection) molding technique is extrusion (injection) form a lubricating layer between the price of the ultra-high molecular weight polyethylene material pad and the die wall, thereby reducing the shear rate of the material differences between the points, reducing the product It deformed, while the high viscosity of the polymer can be improved extrusion (injection) at low speed, low-power conditions. The method produces a lubricating layer of mainly two: self-lubricating and co-lubrication.