Package with high young's modulus yarn and method for winding the yarn package
AssigneeDsm IP Assets B.V.
InventorsEvert Florentinus Florimondus De Danschutter, Herbert Rabe, Carsten Goerke
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Abstract
The invention concerns an improved yarn package and a method winding a package of high Young's modulus yarn. The package has a low normalized standard deviation in unwinding tension and hence is very suitable for converting into a range of yarn constructions and particularly medical products.
Claims17
A package of yarn on a bobbin, wherein the bobbin is a cylindrical bobbin, the package is an open precision cross winding package or a step open precision cross winding package, the package has two ends, the number of ligatures at each of the ends is 8 to 25 and the yarn is a high Young' modulus yarn having a Young's modulus of at least 30 GPa.
A package of a yarn on a bobbin, wherein the normalized standard deviation of the mean unwinding tension measured for 1000 m as Over End Take Off (OETO) with a unwinding speed of 150 m/min is less than 1.5, preferably the normalized standard deviation of the unwinding tension is less than 1.25, and more preferably the normalized standard deviation in unwinding tension is less than 1.1.
Package according toclaim 1, wherein the yarn has a tenacity of at least 13 cN/dtex, preferably the yarn has a tenacity of at least 20 cN/dtex, more preferably the yarn has a tenacity of at least 30 cN/dtex, such as at least 35 cN/dtex, optionally the yarn has a tenacity of less than 75 cN/dtex.
A method of winding a package of high Young's modulus yarn, comprising the steps of
- providing a cylindrical bobbin,
- winding a high Young's modulus yarn onto the bobbin to form a package having two ends,
- wherein the winding pattern is an open precision cross winding and the number of ligatures at each of the ends is 8 to 25, preferably the number of ligatures at each of the ends is 11 to 19.
Dependencies are inferred from the claim text.