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.
Claims26
A package of a yarn on a bobbin, wherein the yarn is a high performance polyethylene yarn having a linear density of at most 500 dtex, the bobbin is a cylindrical bobbin, the package has two ends and is an open precision cross winding package or a step open precision cross winding package, wherein open refers to adjacent positioned yarns not touching each other over most of the distance between the ends of the package and step refers to a reduction in helix angle during winding so that an outer layer has a lower helix angle that an inner layer, and wherein the normalized standard deviation of the mean unwinding tension measured for 1000 m as Over End Take Off (OETO) with an unwinding speed of 150 m/min is less than 1.5.
Dependencies are inferred from the claim text.