| 摘要 |
PURPOSE:To integrally form a tank body with an injection port of the tank body by a method in which a female mold for forming an injection port with an expanded tier portion is provided to the gas injecting port of a female mold for forming a tank body, an expanded injection port is formed in the tank body, the female mold for forming the injection port is turned for release while removing flash, and the injection port is processed by cutting. CONSTITUTION:A female mold 12 for forming the injection port of a tank is provided with tier portion 13 expanded on its injection port side, and a flange part 14 is integrally formed on the injection port 8 side of the tank injection port. A female mold 4 for forming a tank body and the female mold 12 are set in such a way as to hold inwards from the outside the periphery of a parison 3 injected from a parison head 2. The tank body 6 and the injection port 8 are integrally formed, and before they harden, the female mold 12 is turned to cut off flash formed on the injection port 8. After they harden, the molds 4 and 12 are opened and moved outwards for mold release. The periphery and ends of the flange part 14 and the tank injection port 8 are finished cutting by using a rotary cutter 18, etc. |
