| 摘要 |
PURPOSE:To contrive to improve workability and the quality of blow molded article and the like by a method wherein the making of holes can be performed in succession to blow molding. CONSTITUTION:A hole-making pin 4, the tip side of which is enterable and retractable into and from a molding space 3, is provided in a blow mold 1. At the same time, on said pin 4, cutting-off recessed parts 6, along the insides of which a parison P is expandingly formed, are provided. By expandingly forming the parison P on the outside of said pin 4, no air leakage from the interior of the parison P develops. By entering said pin 4 into the mold 1 after blow molding, some part in the cutting-off recessed part 6 of the parison P is cut off, resulting in making holes 12. |
