Method for winding a false twisted yarn in a cheese
AssigneeToray Industries, Inc.
InventorsIsamu Kasai, Kazuo Tomiita, Hisao Inuyama
Life of this patent
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Abstract
A method for soft winding around a bobbin a false twisted yarn, which is delivered from a false twisting zone wherein false twists imparted into a fed yarn and running back therealong are heat set and which is heat treated by a second heater, the false twisted yarn being fed by means of a yarn delivery means to the bobbin in a winding apparatus. The time period wherein the false twisted yarn travels from the yarn delivery means to the bobbin is adjusted at a special value so that a soft wound cheese having a uniform and low apparent density and good shape can be obtained.
Claims16
A method for cheese winding around a bobbin a false twisted yarn, crimps of which are thermally stabilized by being subjected to a heat treatment in a second heat treatment region at a second feed ration Mf % of between 5% and the shrinking limit of said yarn, and which is delivered at a speed of V cm/sec from a false twisting region, wherein false twists imparted into a fed yarn running back therealong are heat set, by means of a yarn delivery means to said bobbin rotatably supported in a winding apparatus where said false twisted yarn is traversed to and fro along said bobbin to form a cheese thereon, characterized in that the time period S sec wherein said false twisted yarn travels from said yarn delivery means to said bobbin satisfies the following equation (1),
- .alpha./V.ltoreq.S.ltoreq..beta./.sub.V 2 (1)
- wherein:
- .alpha. is 15, and
- .beta. is 5/6.times.10.sup.5,
- whereby a soft wound straight cheese with an apparent density of at most 0.3 g/cm.sup.3 is obtained.
A method for preparing a cheese of false twisted yarn comprising the steps of:
- (1) false twist texturing a thermoplastic yarn in a heat treatment zone;
- (2) conveying said yarn from said heat treatment zone at a speed of V cm/sec by a yarn delivery means to a bobbin rotatably supported in a winding apparatus and separated from said delivery means where said yarn travels from said delivery means to said bobbin in the time period S seconds with S defined as
- (.alpha./V).ltoreq.S.ltoreq.(.beta./V.sup.2)
- wherein .alpha. is 15 and .beta. is 5/6.times.10.sup.5 ;
- and
- (3) winding said yarn on said bobbin at a constant rate by a winding means by which said yarn is traversed to and fro along said bobbin to form a cheese with an apparent density of at most 0.3 g/cm.sup.3.
A method for preparing a cheese of false twisted yarn comprising the steps of:
- (1) false twist texturing a thermoplastic yarn in a first heat treatment zone;
- (2) heating said yarn to stabilize said yarn in a second heat treatment zone wherein the feed ratio M.sub.f /% is between about 5% and the shrinkage limit of said yarn;
- (3) conveying said yarn from said second heat treatment zone at a speed of V cm/sec by a yarn delivery means to a bobbin rotatably supported in a winding apparatus and separated from said delivery means where said yarn travels from said delivery means to said bobbin in the time period S seconds with S defined as
- (.alpha./V).ltoreq.S.ltoreq.(.beta./V.sup.2)
- wherein .alpha. is 15 and .beta. is 5/6.times.10.sup.5 ;
- and
- (4) winding said yarn on said bobbin at a constant rate by a winding means by which said yarn is traversed to and fro along said bobbin to form a cheese with an apparent density of at most 0.3 g/cm.sup.3.
Dependencies are inferred from the claim text.