| abstract |
A lightweight blow molded product which is high in strength per weight, rigidity and heat resistance, is excellent in sound-absorbing, heat-insulating and sound-insulating features, can be produced at low costs, and is useful for intake-system parts of an internal combustion engine; and a production method therefor. A blow molding method for a fiber-containing thermoplastic resin, wherein a parison formed of a thermoplastic resin having an inorganic fiber-containing, melt-expansibility is held between opposing molds, a gas is blown in for shaping, and then, as required, a gas pressure is reduced to expand the shaped product; and a blow molded product consisting of thermoplastic resin containing 15 to 70 wt.% of inorganic fibers having an average fiber length of 1 to 20 mm, and having a porosity of 10 to 90%. |