| 摘要 |
PURPOSE:To enable to secure a thickness of the upper part from a holding part, by a method wherein a parison hanging down is made to expand into a shape corresponding to a shape of the inside of a cavity and molding is performed by making the parison stay in the middle part of the title device. CONSTITUTION:An inflatable material 13 is made to expand by sending air into the same through a holding device 14. A protrusion 13a faces hollow parts 11b, 12b which are a little upper than protrusion 11a, 12a of split molds 11, 12. A thickness t4 of a parison 16 in the vicinity of the protrusions 11a, 12a of the split molds 11, 12 becomes thinner than a thickness t5 of the lower part of the same, through which the thickness in the protrusions 11a, 12a of the mold are made into appropriate ones. The parison 16 to be supplied further from a supply nozzle 15 stays on a catch part 13b in a protrusion 13a, directly above which the parison 15 is slackened like a displacement part 16a, the thickness of the circumference of the same becomes thick, through which the thickness at the hollow part of the split mold is made into appropriate one. Molding is performed by performing mold clamping and air blowing into the inflatable material 13, which is made to contract through deflation, and the material 13 is removed outside along with the holding device 14. The molded parison 16 through expansion is cured by coming into contact with the split molds 11, 12 demolded, and made into a product.
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