Paper making and fiber liberation – Processes and products – With coating after drying
Patent
1979-05-16
1980-04-29
Bashore, S. Leon
Paper making and fiber liberation
Processes and products
With coating after drying
162156, D21F 1100
Patent
active
042004870
ABSTRACT:
The glass mat made herein is comprised of two fibrous components, namely, individual filament glass fibers and extended glass fiber elements. These components are formed herein in situ in a wet-laid process from original bundles of glass fibers. The individual filaments appear by conventional filamentation of the bundles. The extended fiber elements, however, are formed by longitudinal extension of a given bundle whose fibers are connected longitudinally. Thereby the effective length of a fiber element is very much greater than the length of the fibers therein. The fiber elements are further characterized by a non-uniform diameter, as contrasted to the fibers themselves, being thicker in the midsection of the element where connection of fibers is maximized, and tapered towards its ends, where fiber connection is at a minimum.
The extended fiber elements preferably predominate by weight of the fibrous content of the mat over the individual filaments. The desired ratio of the two components is achieved in the method of the invention by using bundles whose fibers have a long length, and by very gentle agitation of the dispersion slurry for a short period of time.
REFERENCES:
patent: 2747994 (1956-05-01), Hoopes
patent: 2859109 (1958-11-01), Hawley et al.
patent: 3766003 (1973-10-01), Schuller et al.
patent: 4112174 (1978-09-01), Hannes et al.
Bondoc Alfredo A.
Canfield V. Robert
Ziegler B. Randall
Bashore S. Leon
Chin Peter
GAF Corporation
Katz Walter
Kehm Walter C.
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