Process of making core-sheath filament yarns

Details Process of making core-sheath filament yarns Process of making core-sheath filament yarns

1995-06-07

1997-04-08

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

26417211, 26417215, 2642108, D01D 512, D01F 804

Patent

active

056184794

ABSTRACT:
In a yarn composed of core-sheath filaments with or without further monocomponent filaments, the core and the sheath of the core-sheath filaments are produced by extruding spinnable polymers, with at least almost all the core-sheath filaments having a complete sheath. Of all the core-sheath filaments in the yarn, the proportion of core-sheath filaments P, in %, of which each core-sheath filament has (S.+-.0.1 S) % of sheath content (based on the total volume of the particular core-sheath filament), meets the following conditions: P.ltoreq.100, S.gtoreq.0.5, and P.gtoreq.30+(0.1 S).sup.8 %. This yarn can be produced by a process wherein the core component is fed via a first spinneret plate to a second spinneret plate in a plurality of individual streams, and between the first and second spinneret plate each individual stream of core component is enveloped by the sheath component being fed onto it, and the two components are conjointly spun, drawn and wound up. At least in the area surrounding the individual streams of core component, the sheath component is subjected to a flow resistance. A suitable flow resistance may be provided by a wire mesh.

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