Roving and process for its manufacture
AssigneeHoechst Aktiengesellschaft
InventorsFritjof Maag, Friedrich Unger, Wilhelm Mohr
Life of this patent
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Abstract
A roving is prepared by winding at least one filament yarn around a fiber strand which is untwisted and unsized and has a total titer of from 1,000 to 30,000 dtex. The filament yarn(s) used for winding have an elongation at break of less than 50% and a titer of less than 50 dtex. The length of cohesion of the roving is in the range of from 15 to 500 meters and one meter of the fiber strand is provided with 20 to 300 windings. The roving can be produced in simple manner and it is excellently suitable for the direct spinning of fine yarns.
Claims7
A roving consisting of a strand of spun fibers and at least one filament yarn wrapped around said strand, wherein the spun fibers are untwisted and unsized and the strand has a total titer of from about 1,000 to 30,000 dtex and the filament yarn has an elongation at break of less than 50%, the roving has a cohesion length of 15 to 500 meters and the number a wrappings of the filament yarn around the fiber strand is in the range of from 20 to 300 times per meter.
A process for the manufacture of a roving having a cohesion length of 15 to 500 meters by wrapping at least one filament yarn around an untwisted strand of fibers, said process comprising the steps of, providing a non-consolidated strand of untwisted and unsized staple fibers having a total titer of from about 1,000 to 30,000 dtex, passing said strand through a wrapping station at a delivery speed of over 50 meters per minute, and wrapping at least one filament yarn, having an elongation at break of less than 50% and a titer of less than 50 dtex, around said non-consolidated strand of staple fibers at said wrapping station at the rate of between 30 to 300 wrappings per meter of strand.
Dependencies are inferred from the claim text.