Patent ID: 7597829
Filing Date: 2009-10-06
Classification: B29C

Abstract:
1. An injection molding method that modifies a surface of thermoplastic resin using a supercritical fluid that contains a solute, and molds the thermoplastic resin, said injection molding method comprising the steps of: injecting and filling the thermoplastic resin into a mold cavity that contains no supercritical fluid; forming a space in the mold cavity by moving the mold after said injecting and filling step; introducing into the space a first supercritical fluid that contains the solute and a second supercritical fluid that contains no solute simultaneously; maintaining the first and second supercritical fluid introduced by the introducing step; exhausting from the space the first and second supercritical fluid after said maintaining step; and repeating said introducing step, said maintaining step and said exhausting step.