Viscous dispersion for forming wet-laid, non-woven fabrics
US4049491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1975 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Feb 20, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0335
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.