Extrusion Pressure Vs. Extrusion Ratio Relation for the Hydrostatic Extrusion of Solid Polymers
Ten engineering polymers, crystalline or amorphous, were hydrostatically extruded in castor oil at pressures up to 4 kbars without heating the pressure vessel . The polymers studied included polyethylene, polypropylene, nylon 6, polyoxymethylene, polyvinyl chloride, acryronitrile-butadiene-styrene copolymer, polymethyl methacrylate, polycarbonate, polystyrene, and epoxy. The extrusion ratios studied ranged from 1.2 to 10.0. A linear relationship was experimentally established between the extrusion pressure and extrusion ratio within a certain limit of the latter. In addition, it was experimentally proved that the cross-sectional planes remained planes during the extrusion process when the reduction ratio was not very large .
KeywordsPolymethyl Methacrylate Extrusion Ratio Extrusion Pressure Glass Transition Point Hydrostatic Extrusion
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