Patent ID: 8409490
Filing Date: 2013-04-02
Classification: B29B,B29C,B29K,B65D,Y10T

Abstract:
1. A double blow molding process for molding a polyester resin container, said process comprising: a primary blow molding step in which a preform comprising a polyester resin is biaxially drawn and blow molded into a primary intermediate product; a thermal shrink-molding step in which said primary intermediate product is heated and forcibly shrink-molded into a secondary intermediate product; and a secondary blow molding step in which said secondary intermediate product is blow molded into a container, wherein said process is characterized in that the mold temperature is set in the range of 70° C. to 180° C. for the primary blow molding step, that said primary intermediate product is heated to a temperature ranging from 130° C. to 200° C. in the thermal shrink-molding step, and that the mold temperature is set in the range of 215° C. to 230° C. for the secondary blow molding step, and wherein said preform is heated to a temperature in the range from 70° C. to 130° C. before said primary blow molding step.