Patent ID: 8846795

Claim:
A method for producing a polymer molded article comprising the steps of: preparing a polymer material mainly containing a crystalline polymer; and impregnating the polymer material with a first gas having solubility in the crystalline polymer in an atmosphere in which the pressure of the first gas is equal to or higher than atmospheric, pressure at a temperature higher than (Tm−30)° C. but lower than (Tm−15)° C., where Tm represents the melting point of the crystalline polymer, to obtain a polymer molded article, wherein in the impregnation step, after impregnated with the first gas, the polymer atmosphere in which the pressure of the second gas is equal to or higher than atmospheric pressure at a temperature higher by 5° C. or more than the temperature during, the impregnation with the first as but equal to or lower than (Tm−10)° C. to obtain a polymer molded article.