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

1975-02-20

1977-09-20

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Pore forming in situ

137 4, 162157R, 162157C, 162168R, 162168N, 162168NA, 162189, 162190, D21D 300

Patent

active

040494918

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: 3222244 (1965-12-01), Sommer et al.
patent: 3674621 (1970-02-01), Miyamoto et al.
patent: 3716449 (1973-02-01), Gatward et al.
patent: 3794557 (1974-02-01), Harmon
patent: 3808094 (1974-04-01), McKnight
Casey "Pulp & Paper," vol. II (1960) p. 766.

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