Patent ID: 7108820

Claim:
A production method for a resin molded article, comprising heat-molding a molding material containing a reinforcing fiber and a biodegradable resin to obtain a molded article having a temperature-lowering crystallization peak temperature of in a range of 80 to 120° C., and subjecting the molded article to an annealing treatment at 80 to 165° C. for 0.1 to 30 minutes to produce a resin molded article containing poly lactic acid having a weight average molecular weight of 50,000 or more and less than 120,000 and an L-lactic acid with optical purity of 95% or more, and a reinforcing fiber in a mass ratio of poly lactic acid/reinforcing fiber of 95/5 to 50/50 so as to have a water content of less than 200 ppm.