| 摘要 |
PURPOSE:To reduce the weight of neck plate, shorten the molding cycle and prevent deformations of members between tie bars at the time of releasing molds by pressing spit molds or the plate in a direction for preventing a strain of the plate due to a mold releasing force when injection core molds are released from a preform. CONSTITUTION:A neck cavity mold 30 having a pair of spit molds 32a, 32b for molding a neck part of a preform 100 is supported to a neck plate 50. The plate 50 is circulated to be conveyed to stations. The plates 50 for openably supporting the molds 3a, 32b are circulated to be conveyed to stations. The injection stations clamps an injection cavity mold 28, an injection core mold 34 and a neck cavity mold 30, and injection molds the preform. When the preform 100 is released from the mold 34, means for pressing the split molds in a direction for preventing a strain of the plate 50 due to mold releasing force is provided. |
