| 摘要 |
<p> A method of producing a lightweight resin molded product which is a blow molded product formed from a thermoplastic resin containing 10 to 70 wt.% of fiber and has a reinforcing rib structure in a hollow portion, the method comprising injecting or injection-compressing a fiber-containing molten thermoplastic resin into a mold cavity by using a mold having a rib-forming means movable from/toward the mold cavity, retracting the mold in a direction of expanding the volume of the mold cavity and injecting gas into the molten resin after the start of the retracting. The lightweight resin molded product which is not reduced in rigidity and strength even when provided with a large area and a hollow portion, has a good appearance and a wide control range for weight reduction and can be applicable to a wide range of molded products.</p> |
