Method for injection molding of thermoplastic resins
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsHiroshi Yamaki, Yoshimasa Matsuura, Hiroshi Kataoka
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Abstract
An economical method for facilitating injection molding of a thermoplastic resin by reducing the viscosity of a molten resin without impairing the physical properties of the resin, the surface appearance of the molded article and productivity. In the method for injection molding of a thermoplastic resin, a thermoplastic resin in which not less than 0.2% by weight of carbon dioxide is dissolved is injected into a mold cavity pressurized with a gas beforehand to at least a pressure where foaming does not take place in the flow front of the molten resin.
Claims4
A method for injection molding of a thermoplastic resin, which comprises injecting a molten resin in which not less than 0.2% by weight of carbon dioxide is dissolved so as to lower the melt viscosity thereof, into a mold cavity pressurized with carbon dioxide beforehand to at least a pressure where foaming does not take place in the flow front of the molten resin;
- and
- pressurizing the injected molten resin so as to be cooled and solidified under a high pressure.
Dependencies are inferred from the claim text.