| 摘要 |
<p>1,259,085. Forming and finishing yarns. COMPAGNIE DE SAINT-GOBAIN. 2 Feb., 1970 [5 Feb., 1969], No. 4836/70. Heading D1F and D1W. Composite products are prepared by passing one or more threads or strands of filaments 1 to a venturi tube 4 where the filaments are separated from each other, applying finely divided synthetic resin to the separated filaments, melting the resin, and regrouping the filaments. The coated filaments may be passed through a heated die 6 where preliminary melting of the resin takes place and through oven 7 which may be air circulated to entrain volatile products. The filaments may be shaped by passing through heated die 8. The regrouped resin impregnated filaments may be cooled and then cut up by the granulator device 10. The filaments may be of glass, quartz, silica, asbestos, carbon or boron. The resin may be thermoplastic, e.g. polystyrene, copolymers of styrene with acrylonitrile or butadiene, polyethylene, polypropylene and copolymers thereof, polyvinyl chloride or copolymers thereof, methyl polymethacrylate and copolymers of methacrylic or acrylic acid esters, polyamides, polycaprolactam, hexamethylene diamine, polycarbonates, polyphenylene oxide and cellulose derivatives, e.g. cellulose acetate; or thermosetting, e.g. aminoplasts, phenoplasts, epoxides and alkyds. To assist distribution of the resin in the fibres the latter may be given an electrostatic charge which is of opposite polarity to that given to the resin (see Figs. 2a and 6, not shown).</p> |
