| 摘要 |
<p>PURPOSE:To efficiently form a thin intermediate rupturable part by arranging prescribed core members in a more inside position than a door cleavage line of a molding cavity, filling melting resin in the cavity, injecting high pressure gas along projecting strip parts while retreating the core members, and forming hollow parts having an inside turning projecting part. CONSTITUTION:Core members 40 having tips 40a of a similar figure smaller than a cleavage line are arranged in a more inside position of a door cleavage line of a molding cavity 11. In a condition where a mold 10 is closed and the tips 40a of the core members 40 are brought into contact with a mold surface 21 of a cavity mold 20, melting resin is injected into and filled in the cavity 11 from a gate part 12. Next, the core members 40 are retreated, and the tips 40a are retreated from the inside surface 21 of the cavity mold 20, and while forming spaces 41, high pressure gas G is injected from the gate part 12 along groove parts 32 to constitute projecting parts, and the resin in the groove parts 32 is fluidized, and hollow parts 71 are formed in the groove parts 32.</p> |
