METHOD FOR INJECTION MOLDING OF THERMOPLASTIC RESINS

摘要

An economical method for facilitating injection molding of thermoplastic resins by reducing the viscosity of molten resin without impairing the physical properties of the resins, the appearance of the molded product, and the productivity. This method is characterized in that a thermoplastic resin in which 0.2 weight percent or more of carbon dioxide is dissolved is injected into a mold cavity pressurized with a gas to at least a pressure where foaming does not take place in the flow front of the molten resin.