Method of forming a wrapped yarn

Details Method of forming a wrapped yarn Method of forming a wrapped yarn

1976-12-20

1979-08-21

Watkins, Donald

Textiles: spinning, twisting, and twining

Apparatus and processes

Covering or wrapping

57 18, D02G 338, D02G 302

Patent

active

041648374

ABSTRACT:
A yarn is described composed of an untwisted staple sliver and of at least one filament wound around this sliver.
The denier of the winding filamentary yarn is under 50 dtex, the elongation at break of the winding filamentary yarn is at least as great as the elongation at break of the staple fibers; the strength at a specific load of the winding filamentary yarn at 4% of elongation is at least 10 g. Moreover, the shrinkage factor of the winding filamentary yarn is within the same range as the shrinkage factor of the staple fibers. Also at least 85% of the staple fibers are longitudinally orientated in the sense of the yarn direction.
Furthermore, a process is described for the manufacture of a wrapped yarn by wrapping at least one filamentary yarn around stretched, highly oriented staple fibers being led through the hollow shaft of a rotating filamentary yarn bobbin. The winding filamentary yarn is withdrawn from the filamentary yarn bobbin and also led through the hollow shaft of this filamentary yarn bobbin. During this processing step and after having stretched the staple sliver, a filament of denier 1-50 dtex, the tension of which is at most 5 g, is wrapped around the staple sliver.

REFERENCES:
patent: 3328946 (1967-07-01), Schumann et al.
patent: 3438193 (1969-04-01), Kosaka et al.
patent: 3577718 (1971-05-01), Purcell
patent: 3643416 (1972-02-01), Andrews et al.
patent: 3717959 (1973-02-01), Chatin
patent: 3769787 (1973-11-01), Rosenstein et al.
patent: 3831369 (1974-08-01), Northup et al.

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