Ultra high molecular weight polyethylene extrusion blown film new process

Takashi Na-kahara of Mitsui Chemicals Corporation of Japan proposed a new ultra-high molecular weight polyethylene (UHMWPE) extrusion blow molding process at the 2005 Technical Conference of the American Society of Plastics Engineers (SPE), using two molding processes: compression molding and extrusion blow molding. The combined method produces a biaxially oriented film with a very thin thickness. The length and diameter ratio (L/D) of the molding screw extruder was 30:1, and the shallow screw groove and the groove in the barrel. The UHMWPE is first compressed in a heated barrel and then rotated through a right-angle head to correct and eliminate cracks that may occur in the tubular film.

The UHMWPE blown film has a longitudinal stretch ratio in the range of 6:1 to 30:1, a blow-up ratio of 6:1 to 10:1, and a film thickness of 5 to 140 μm. It has extremely high tensile strength and wear resistance. Sex, suitable for industrial liners and hydraulic hose covers. The UHMWPE film previously produced by the intermittent compression skiving method not only has a slow speed and a high processing cost, but also cannot produce a film with a thickness of less than 50 μm. The new process is a continuous process, and the yield is high and the quality is also superior to the compression molding method. .

Information Source: Plastic