Method and apparatus for injection molding.

摘要

The method and apparatus includes and injection molding assembly including a mold (11), a core (12) and a mold cavity (13) therebetween wherein said mold cavity has a base (30), a peripheral area (33) of said base and a central area (34) of said base, at least two injection gates (41-44) for injecting plastic material into said mold cavity (13) situated adjacent the peripheral area (33) of the mold cavity in a substantially balanced fashion, means for injecting plastic material through the injection gates (41-44) whereby molten plastic advances from the injection gates (41-44) in the mold cavity (13) to force gas in advance of the plastic and to stabilize the core (12), and means (62, 63) for venting the gas from the mold cavity (13).