| 摘要 |
PROBLEM TO BE SOLVED: To expand the range of application of a blow-molded item by easily improving the gloss of surface of the blow-molded item. SOLUTION: An innermost layer of parison of synthetic resin C1 is extruded from a first delivery port 10 of a blow die head A1 and an outer layer of parison of synthetic resin D is delivered from other delivery port 20 and the outer periphery of the parison C1 is covered integrally with the parison D outside the die head A1. The parison D is molded from different or the same kinds of resin as the parison C1. A blow molding is performed using the multilayer parison P. And, if necessary, ABS is employed for the inner layer parison and HDPE is used for the outer layer parison, which parisons may be used for blow molding as a multilayer parison. |
