| 摘要 |
PROBLEM TO BE SOLVED: To ensure good sealability only by the pressing force of an injection nozzle to a mold without requiring the fastening by a bolt for sealing or a mold clamping device by oil pressure at all. SOLUTION: The mold 21 is constituted of a lower mold 24 and an upper mold 25. The lower mold 24 is constituted of first and second lower molds 27 and 28, and a core 29. The first and second lower molds 27 and 28, and the upper mold 25 are arranged in a stacked state. A molten molding material 9 is injected in the cavity 8 of the mold 21 from the injection nozzle 22 and the second lower mold 28 is taken out as a molded article. When the injection pressure of the molding material 9 is set to P and seal pressure is set to Pa and the constant value determined by the molding material 9 is set to C, a condition of Pa/P>C is satisfied.
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