Foamed polyamide fibers
AssigneeAllied Corporation
InventorsHsin L. Li, Hendrikus J. Oswald
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Abstract
A molten polymer containing a blowing agent and, usually, a nucleating agent, is spun into fibers with screen packs or equivalent structures upstream of the spinning apertures. The use of screen packs enables the production of fibers with finer bubbles, which are therefore susceptable to greater melt-drawdown and post-drawing and can have better tensile properties. Foamed polyamide fibers are produced with average bubble diameters one-twentieth or less, compared to the effective fiber diameter.
Claims6
A foamed polyamide fiber having an effective diameter of between about 0.01 and about 1.0 mm and a plurality of predominantly closed-cell bubbles of diameter less than one-twentieth the effective diameter of the polyamide fiber.
Dependencies are inferred from the claim text.