Patent ID: 6994814
Filing Date: 2006-02-07
Classification: B29C

Abstract:
1. A method for manufacturing an injection-molded foamed article, the method comprising the steps of: melt-kneading a thermoplastic resin and a chemical foaming agent in a cylinder of an injection unit, injecting the melt-kneaded thermoplastic resin from the cylinder into a cavity of a mold, and cooling and solidifying the thermoplastic resin injected in the cavity, wherein at least one of conditions (1) and (2) given below is satisfied: wherein M p denotes the melting point (° C.) of the thermoplastic resin, T denotes the molding temperature (° C.) and γ denotes the shear rate (sec −1 ) of the thermoplastic resin during its filling into the cavity at the molding temperature T; wherein T m denotes a mold temperature (° C.), and M p has the same meaning as above; and wherein condition (3) given below is satisfied: wherein M p , T and γ have the same meanings as above and η denotes the melt viscosity (Pa·sec) of the thermoplastic resin at the molding temperature T.