| 摘要 |
1,158,602. Covering cores by winding. IMPERIAL CHEMICAL INDUSTRIES Ltd. 17 Dec., 1965 [24 Dec., 1964(2)], Nos. 52523/64 and 52524/64. Heading B8G. [Also in Division Dl] Composite yarn or an insulated conductor comprises a centrally disposed core strand in the form of a spun staple or continuous filament yarn or a monofilament or a metal wire and a wrapping component constituted by one or more continuous filaments in the form of a multiplicity of serially connected, axially extending loops arranged so that they progressively advance along the axis of, and helically twist around, the core, many of the loops being contained for at least part of their length within another loop thereby providing a nest of loops which, as a continuous, tight, tubular sheath, completely envelops the core. The wrapping filaments may be of a synthetic polymer, e.g. a polyamide, polyester, polyhydrocarbon, polycarbonate. The core may be elastic, e.g. derived from polyesterurethane such as identified in Specification 1,040,365, or derived from N-alkylated polyamide as identified in Specifications 1,037,474 and 1,060,799. Yarn is produced by passing an extruded continuous filament 37 (or up to, say, 50 thereof) to a rotating body 21 on which it is wound. The body has a peripheral speed sufficient to tension, attenuate and molecularly orient the filaments and a reciprocating movement is imparted to the filament by a traverse mechanism 25 whereby the filament is coiled around the body so as to form a constantly accumulating sleeve 38 comprising overlaid and interconnected helices. As the sleeve is continuously withdrawn from the body so as to impart twist to the coils of filament, a core strand 26 introduced within the sleeve moves along an axial passage in the body and the axis of rotation at a speed less than the peripheral speed of the body and is enveloped by the sleeve serving as a wrapping component. The core strand may be fed through and from the rotating body in the same direction as, or in the opposite direction from, the sleeve movement: in the latter case, the sleeve is everted as it leaves the body and is withdrawn through the axial passage therein. |
