Process for preparing gypsum board

Details Process for preparing gypsum board Process for preparing gypsum board

1974-05-28

1976-04-20

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

106112, 106115, 156 39, 162145, 162153, 162181R, 162155, 162205, 264112, 264113, D21F 1104, D21F 1108

Patent

active

039517357

ABSTRACT:
A gypsum wallboard or plasterboard having a high mechanical strength, especially high impact strength, and a large bulk density is prepared from a mixture consisting essentially of calcined gypsum, cellulosic fibers, asbestos fibers, a setting retardant for the calcined gypsum and water, by withdrawing solid components of the mixture in layer form. A plurality of the thus-obtained layers is piled to form a preform of the desired thickness and pressure-molding the preform under a molding pressure of from 10 to 400 kg/cm.sup.2 to obtain the board product.

REFERENCES:
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patent: 2007551 (1935-07-01), Tompkins
patent: 2076349 (1937-04-01), Porter et al.
patent: 2152670 (1939-04-01), Shutt
patent: 2348829 (1944-05-01), MacArthur et al.
patent: 2856304 (1958-10-01), Kirk
patent: 3004878 (1961-10-01), Tomlinson
patent: 3138518 (1964-06-01), Greenhouse et al.
patent: 3179529 (1965-04-01), Hickey et al.
patent: 3270476 (1966-09-01), Enslen et al.
patent: 3368936 (1968-02-01), DeLong
patent: 3451832 (1969-06-01), Kuntze

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