GB1348923A - Process and apparatus for manufacturing blended yarns from synthetic polymers - Google Patents

Abstract

1348923 Multicolour hetero yarns VICKERSZIMMER A G PLANUNG UND BAU VON INDUSTRIEANLAGEN 19 April 1971 [15 April 1970] 24530/71 Heading B5B [Also in Division D1] Blended, multicolour yarns comprising filaments of two or more fibre-forming polymers, preferably polyesters and polyamides, are prepared in a process which comprises melt extruding two or more polymers, one of which is dyed, simultaneously through spinnerets, each of which is associated with a single polymer, to form at least two groups of filaments which are solidified and guided in a single plane so that filaments of different colours alternate and lie next to one another and thereafter joining the groups of filaments into a multifilament yarn which is then wound up by conventional winding means. At least one of fibre-forming polymers may contain a delustrant and/or may exhibit higher thermal shrinkage than the other component polymers, when the multifilament yarns produced by the process combine not only filaments of different colours but also of varying lustre and/or, after suitable heat treatment may be yarns of high-bulk or loop yarns. Between formation of the yarn and wind-up the multifilament may be given a spin-finish, drawn and textured. In apparatus suitable for preparing the multicolour blended yarns two polymer streams are fed from separate tanks 1 and 2 to spinnerets 6 and 7 in spinning beam 5 and extruded as two separate groups 8 and 9 of filaments which are solidified and pass through a guide 10 in which filaments of group 8 alternate with those of group 9 (Fig. 2, not shown). The groups 8 and 9 are combined on roll 11 to form a multifilament and fed to draw rolls 13, 14 via roll 12 which applies a spin finish to the yarn. After drawing the multifilament passes through texturing zone 15 where it is optionally crimped and is then wound up on bobbin 16. Blended yarns of different counts useful in the preparation of fleece-covers, cut-pile carpets and boucle goods may be prepared by using spinnerets in which the orifices have different diameters, the colour effect of the blended yarn being further affected if the orifices have different cross-sectional shapes.