Viscous dispersion for forming wet-laid, non-woven fabrics

Details Viscous dispersion for forming wet-laid, non-woven fabrics Viscous dispersion for forming wet-laid, non-woven fabrics

1977-04-11

1980-04-29

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Pore forming in situ

162157R, 162190, D21D 300

Patent

active

042004888

ABSTRACT:
An improved process for forming a non-woven fabric by wet-laying, on paper making equipment, staple length, synthetic fibers having a length to diameter ratio of about 400 to 3000, and an improved, non-woven fabric produced by the process. The process involves forming a stable, viscous, uniform, air-fiber-water dispersion by: adding the fibers to a high-shear agitated mixture of water and a dispersant to separate the fibers and to completely and uniformly distribute the individual fibers throughout the resulting, high-shear agitated, air, water and fiber mixture; and then, slowly adding a thixotropic thickener to the high-shear agitated mixture to form the viscous, air-fiber-water dispersion, having a nascent viscosity of about 10 to 125 cps., when measured at a shear rate of 30.5 sec..sup.-1, and in which the individual fibers are restrained from becoming entangled and from forming knits, bundles, and strings.

REFERENCES:
patent: 2998344 (1961-08-01), Carlson
patent: 3141815 (1964-07-01), Manley
patent: 3674621 (1972-07-01), Miyamoto et al.
patent: 3716449 (1973-02-01), Gatward et al.
patent: 3794557 (1974-02-01), Harmon
patent: 4007083 (1977-02-01), Ring et al.
Battista, "Synthetic Fib. in Paper Making", (1964) p. 327.

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