PRESSURE FLUID INTRODUCING DEVICE FOR HOLLOW INJECTION MOLDING

摘要

PURPOSE:To eliminate the back flow of a molten resin to a pressure fluid passage and to certainly introduce a pressure fluid into the molten resin. CONSTITUTION:The gap between a cylindrical sleeve 2 and the axial core 4 inserted in the sleeve 2 is set to a pressure fluid passage 1 and the tip part of the axial core 4 is allowed to protrude into a mold 1 to set the side surface of the protruding part of the axial core to a guide surface 4. By this constitution, the width of the pressure fluid passage 3 can be easily set to a size permitting a pressure fluid to pass but preventing the invasion of the molten resin and the pressure fluid introduced under pressure is guided to the interior of the mold 1 by the guide surface 10.