Process for producing a highly bulky nonwoven fabric

Details Process for producing a highly bulky nonwoven fabric Process for producing a highly bulky nonwoven fabric

1982-07-27

1984-09-04

Woo, Jay H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156181, 264171, 264324, B29J 500

Patent

active

044695403

ABSTRACT:
A process for producing a highly bulky nonwoven fabric is provided, which process comprises melt-spinning a crystalline propylene polymer as a first component and an ethylene polymer as a second component, into side-by-side or sheath-core type composite fibers so that the first component after melt-spinning can have a specified M.sub.w /M.sub.n value; collecting the fibers into a continuous tow form; stretching the tow in a specified stretch ratio; cooling the stretched tow to a specified temperature and then drawing it by a pair of nip rolls, one or both of which are of a non-metal, to obtain heat-adhesive composite fibers having apparent crimps of a specified number, a specified percentage crimp modulus and substantially no latent crimpability; and heat-treating a web consisting of the fibers alone or a blend thereof with other fibers at a specified temperature.

REFERENCES:
patent: 3533904 (1970-10-01), Jurkiowitsch
patent: 3589956 (1971-06-01), Kranz
patent: 3595731 (1971-07-01), Davies
patent: 4115620 (1978-09-01), Gupta et al.
patent: 4211819 (1980-07-01), Kunimune et al.
patent: 4234655 (1980-11-01), Kunimune et al.
patent: 4269888 (1981-05-01), Ejima
patent: 4315881 (1982-02-01), Nakajima et al.
patent: 4323626 (1982-04-01), Kunimune et al.

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