Patent ID: 6746643
Filing Date: 2004-06-08
Classification: B29C,B29K,Y10S

Abstract:
A method for producing blow moldings of crystalline thermoplastic resin, which comprises setting a melt parison of a crystalline thermoplastic resin in a mold and then blowing the parison, the method comprising the steps of(1) blowing and shaping the parison at a mold temperature falling between the crystallization point of the resin minus 10Â° C. and the melting point of the resin; (2) cooling the blown parison at a temperature falling between the crystallization point of the resin minus 15Â° C. and the crystallization point thereof minus 45Â° C., (3) keeping the blown parison for a dwell time falling between 30 and 300 seconds; and (4) cooling the blown parison in an ordinary manner.