Patent ID: 6709625
Filing Date: 2004-03-23
Classification: B29C

Abstract:
Process for injection molding of a molded part made from plastic material having at least one cavity comprising:a) injection of plastic melt from an injection unit along a melt flow path into the cavity of an injection-molding die; b) injection of a liquid into the still molten plastic material, so that the latter is pressed against the walls of the cavity; c) allowing the plastic material to solidify until the latter forms the molded part in self-supporting manner; and d) releasing the molded part from the cavity of the injection-molding die; wherein after injecting the plastic melt according to step a) and after injecting the liquid according to step b), both the melt flow path and a flow path via which the liquid is injected, are closed, and wherein releasing according to step d) only takes place when the injected liquid has transferred at least partly to a gaseous state of aggregation, and wherein, before releasing according to step d), relieving of pressure in the interior of the molded part takes place by introducing a vent opening.