Injection molding method and apparatus
AssigneeHitachi Maxell, Ltd.
InventorsAtsushi Yusa, Terumasa Kondo, Toshiyuki Tomita, Masami Suzuki
Life of this patent
Estimating the term…
Abstract
An injection molding method that modifies a surface of thermoplastic resin using a supercritical fluid that contains a solute, and molds the thermoplastic resin, includes the steps of injecting the thermoplastic resin into a mold cavity in a mold, a space being formed between the mold cavity and the surface of the thermoplastic resin, introducing into the space the supercritical fluid that contains the solute, and exhausting from the space the supercritical fluid that contains the solute.
Claims7
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.
Dependencies are inferred from the claim text.