Heather yarn made by combining polyester and polyamide yarns
AssigneeDu Pont Canada Inc.
InventorsBruce D. Mountney, Ralph C. Wirsig
Life of this patent
Estimating the term…
Abstract
A continuous process is disclosed for producing a heather yarn from a continuous filament polyester feed yarn having a residual draw ratio in the range of from 1.6 to 2.0 and a continuous filament polyamide feed yarn having a residual draw ratio in the range of from 106 to 120 percent of the residual draw ratio of the polyester feed yarn. The process involves the steps of: (1) combining the yarns; (2) false twist texturing and drawing the combined yarns in a draw-texturing zone comprising feed rolls, a heating means, a friction twisting element and draw rolls; (3) randomly entangling the combined and textured yarns together in a jet-intermingling zone formed by an air jet device; and (4) withdrawing the heather yarn so produced.
Claims8
A continuous process for producing heather yarn comprising the steps of combining a continuous filament polyester feed yarn having a residual draw ratio in the range of from 1.6 to 2.0 with a continuous filament polyamide feed yarn having a residual draw ratio in the range of from 106 to 120 percent of the residual draw ratio of the polyester feed yarn, feeding the combined yarns to a draw-texturing zone, false twist texturing and drawing the combined yarns in the draw-texturing zone at a draw ratio equivalent to 95 to 105 percent of the residual draw ratio of the polyester feed yarn, feeding the combined yarns from the draw-texturing zone to a jet-intermingling zone, randomly entangling the combined yarns together in the jet-intermingling zone and withdrawing the heather yarn.
Dependencies are inferred from the claim text.