| 摘要 |
1334702 Bonded fibre article IMPERIAL CHEMICAL INDUSTRIES Ltd 19 April 1971 [7 April 1970] 16512/70 Heading D1R A fibre-reinforced article is made by passing a roving through a bed of powdered thermoplastic material, separating the roving into filaments or bundles of filaments whilst the roving is in the bed and then heating the powder-impregnated roving to above the melting point of the thermoplastic. The thermoplastic materials can be specified polymers and copolymers of olefins, vinyls, acrylates, fumarates, ethers, imides, acetates, styrene formaldehyde, acrylonitrile, butadiene, perfluoroethylene and propylene, chlorinated polymers, polyesters, polyamides, polysulphones, polyphenylene oxides, polycarbonates, polyurethanes and cellulose polymers. Blends of polymers can be used. The polymers may contain additives, e.g. Fe 2 O 3 . The fibres can be glass filaments coated with silane, starch, polyvinyl alcohol, polyvinyl acetate, or carbon or metal filaments. The roving can be opened by gas jets or by passing it over rods which can be ribbed, threaded, rotatable and/or electrically charged. The bed of powder may be fluidised with air, N 2 , CO 2 , He or Ar. The powdered impregnated roving can be headed in a die or extruder and have a further coating of thermoplastic material applied thereto. The thermoplastic-impregnated roving produced may be chopped up to form extrusion pellets. |
