| 摘要 |
PROBLEM TO BE SOLVED: To efficiently mold, especially a box-type molding with a superior appearance, regardless of the shape of the molding, in the lightweight resin molding having outstanding strength and rigidity. SOLUTION: A thermoplastic resin containing fiber with melt inflation properties is injected into the cavity of a molding die in such a way that the resin is equivalent to 40-100% of the capacity of the cavity, and gas is injected into the molten resin to form a hollow part after the start of resin injection. Thus the molten containing fiber is inflated by reducing the pressure of the gas (depressurizing). The described procedures are the method for molding the lightweight resin molding containing fiber. In addition, the molding is formed of a thermoplastic resin containing fiber with 1-20 mm average length of the fiber, the content of which is 10-70 wt.%. Further the surface part of the molded product is made up of a homogeneous and substantially voidless layer and the interior is made up of a void-containing part.
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