UHMWPE forming: General. Extrusion. Extrusion equipment are ram extruder, a single screw extruder and a twin screw extruder. Use of a twin screw extruder co-rotating twin-screw extruder. The 1960s were powered by a ram extruder ultra high molecular weight plastic board prices, the mid-1970s, Japan, the United States, West Germany has developed a single-screw extrusion process. UHMWPE identification methods: visual methods. The real UHMWPE surface smooth, uniform, smooth and very uniform density section, if not pure polyethylene material is faded and uneven density. UHMWPE is a polymer compound.