False twisting yarn and production method thereof
AssigneeToray Industries, Inc.
InventorsHiroaki Date, Noboru Ueno
Life of this patent
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Abstract
A false twisting yarn composed of monofilaments containing a polyester component of which main component is polytrimethylene terephthalate, wherein the false twisting yarn is a false twisting yarn which satisfies all of the requirements of (1) a shrinkage ratio by wet heat treatment at 98° C. for 20 minutes is 5% or less, (2) a ratio (TS/WS) of elastic stretch ratio after wet heat treatment at 90° C. for 20 minutes (WS) and elastic stretch ratio after dry heat treatment at 90° C. for 15 minutes (TS) is, 0<TS/WS≦1, and (3) a tensile strength is 2.0 cN/dtex or more. By using the false twisting yarn, it is possible to produce a pile cloth having a soft touch and a low shrinkage.
Claims8
A false twisting yarn comprising monofilaments containing a polyester component of which a main component is polytrimethylene terephthalate, and satisfying characteristics (1) to (3):
- (1) a shrinkage ratio by wet heat treatment at 98° C. for 20 minutes is 5% or less;
- (2) a ratio (TS/WS) of elastic stretch ratio after wet heat treatment at 90° C. for 20 minutes (WS) and elastic stretch ratio after dry heat treatment at 90° C. for 15 minutes (TS) is, 0<TS/WS≦1;
- and
- (3) a tensile strength is 2.0 cN/dtex or more;
- wherein the monofilament is a composite fiber which contains a polyester component (A) of which main component is polytrimethylene terephthalate and other polyester component (B), and these components (A) and (B) are composited in a substantially concentrically core sheath configuration along the fiber length direction.
A method of producing a false twisting yarn in which false twisting is carried out with a 2 heater false twisting method to a fiber comprising monofilaments containing a polyester component of which a main component is polytrimethylene terephthalate, wherein said false twisting is carried out at a yarn temperature at an exit of a twist region heater of 120° C. or more and 200° C. or less, at a yarn temperature at an exit of a 2nd set heater of 120° C. or more and 200° C. or less, at a false twisting coefficient (K) of 10,000 or more and 25,000 or less, and at a feeding ratio (%) in the 2nd set heater of 5% or more and 30% or less.
Dependencies are inferred from the claim text.