| 摘要 |
PURPOSE:To provide the manufacturing method of a fiber reinforced plastic molded form excellent in productivity by a method wherein reinforcing fibers, impregnated with thermo plastic resin, are wound around a mandrel to form a preliminary molded form, then, the preliminary molded form is heated to a temperature higher than the softening temperature of the thermoplastic resin and is cooled while being pressurized in a mold. CONSTITUTION:A preliminary molded form is formed by a method wherein fibers, impregnated with thermoplastic resin, are wound or braided on a mandrel (core metal or core material). A wound part or a braided part is heated locally to soften the fibers and facilitate the winding of the fibers whereby the raveling of the wound fibers is prevented. A balsa wood, synthetic resin expanded form or the like is used as the material of a core material. The obtained preliminary molded form is heated to a temperature higher than the softening temperature of the thermoplastic resin. The softening temperature is different depending on the kind of the resin and it is 250 deg.C in the case of polyamide while it is 220 deg.C or higher in the case of polybutylene terephthalate, for example. The heated preliminary molded form is cooled while being pressurized in a mold. The temperature of the mold is kept lower than the softening temperature. According to this method, a composite form, excellent in dimensional accuracy and high in strength, may be manufactured with good productivity while the compos ite form may be used for a use in which a resistance to corrosion, insulating property, heat insulating property and lightening property are requested.
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