| 摘要 |
PURPOSE:To make it possible to mold a hollow molded product having various wall thickness distributions by a method wherein a temporary cooling groove mutually communicated with a cavity peripheral wall is formed and a hollow parison is molded while a cavity periphery is cooled by this temporary cooling groove. CONSTITUTION:The shallow temporary horizontal grooves 14a with a same depth are provided to the cavity peripheral wall 13 at a predetermined interval as well as the temporay cooling grooves 15a mutually communicating each temporary horizontal grooves 14a above and below are formed. Subsequently, the parison is formed while the cavity peripheral wall 13 is cooled by this temporary cooling grooves 15a and the parison is heated secondarily by a temp. controlling apparatus to adjust the temp. of the parison and, therafter, the parison is stretched in a blow metal mold as well as air is blown to mold te hollow molded product. Thereby, the parison having a temp. distribution capable of molding the hollow molded product with a desired wall thickness distribution can be molded. |
