Core yarn with a core of high strength polyester material, production thereof and use of selected polyester material for producing core yarns
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United States of America Patent
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Apr 7, 1998
Grant Date -
N/A
app pub date -
Mar 18, 1997
filing date -
Oct 3, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In core yarns, a) the polyester material of the core filaments has an average molecular weight corresponding to a relative solution viscosity of at least 1.9, and b) the core has a specific strength of at least 60 cN/tex, the core yarns producing a seam length to rupture of more than 800 cm in a sewing test under aggravated conditions. The core yarns are obtainable by a process comprising the measures of: i) producing multifilament yarns based on polyesters having an average molecular weight corresponding to a relative solution viscosity of at least 1.9 by melt spinning polyester with a takeoff speed of at least 1500 m/min. and subsequently drawing under conditions such that the yarn has a breaking extension of about 15% and a breaking strength which corresponds to the maximum breaking strength obtainable for the yarn in question or is up to 30% below that value, and ii) sheathing this multifilament yarn with fibers of vegetable, regenerated or synthetic origin or mixtures thereof in a conventional manner in such a way that the multifilament yarn is virtually completely covered.
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