MANUFACTURE OF LOW FORMABLE POLYSTYRENE RESIN SHEET

摘要

PURPOSE:To provide the process which produces in excellent productivity the low formable polystyrene resin sheet with the magnifying power of expansion of about 1.5-7 and high quality. CONSTITUTION:After polystyrene resin and foaming agent have been kneaded in molten state in an extruding machine, the obtained molten and kneaded material is caused to pass through a gear pump, and then the molten and kneaded material is extruded from a die. The pressure of the molten and kneaded material at the inlet of the gear pump is kept at most 120kgf/cm<2>G.