Producing foamed fibers

Details Producing foamed fibers Producing foamed fibers

1983-04-29

1985-12-31

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 53, 264176F, 2642106, 2642108, 264DIG5, 425198, 425199, 425817C, B29D 2700, B29F 304

Patent

active

045620229

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 postdrawing 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.

REFERENCES:
patent: 3006028 (1961-10-01), Calhoun
patent: 3028627 (1962-04-01), McCormick
patent: 3295161 (1967-01-01), Mott
patent: 3847524 (1974-11-01), Mott
Chem. Abstr. 90:24692m (1979) of Japanese Kokai 78,106,770.

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