High speed spinning of sheath/core bicomponent fibers
AssigneeBASF SE
InventorTheodore G. Karageorgiou
Life of this patent
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Abstract
Processes whereby sheath/core bicomponent fibers are melt-spun at relatively high spinning rates. In particularly preferred forms, polyamide sheath/core bicomponent fibers are made at melt-spinning speeds of about 4000 meters per minute or greater, and more preferably about 4500 meters per minute or greater. Most preferably, the sheath is formed of nylon 6,12 while the core is formed of nylon 6.
Claims21
A process for making bicomponent fibers comprising melt-spinning first and second polymer streams at a melt-spinning speed of about 4000 meters per minute or greater to form a bicomponent fiber having first and second fiber domains corresponding to said first and second polymer streams, respectively, and having a modification ratio of at least about 2.0.
A process for making partially oriented yarns comprised of multiple bicomponent filaments comprising (i) melt-spinning multiple first and second polymer streams at a melt-spinning speed of about 4000 meters per minute or greater to form multiple bicomponent fibers each having first and second fiber domains corresponding to said first and second polymer streams, respectively, and having a modification ratio of at least about 2.0, (ii) drawing the multiple bicomponent fibers to achieve a fiber elongation of least about 60%, and (iii) collecting the multiple bicomponent fibers to form a yarn thereof.
Dependencies are inferred from the claim text.