Method of producing inorganic boards

Details Method of producing inorganic boards Method of producing inorganic boards

1978-03-23

1979-01-02

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Plural fiber containing

34 16, 34 18, 34 23, 34 92, 106119, 106120, 162146, 162153, 162154, 162155, 162206, 162207, 162221, 162225, 264 82, 264101, 264102, 264333, D21F 1100, F26B 504, C04B 100, C04B 1514

Patent

active

041325907

ABSTRACT:
A method of producing an inorganic substance board, wherein after preparation, such as by use of paper making process, the board is hardened in an autoclave with saturated steam at a high temperature, high pressure and for a suitable length of time, and after hardening, subjecting the board to one or more drying cycles comprising a vacuum treatment at 60 to 300 Torrs, for a suitable length of time to enable the core of the board to reach a suitable temperature, the application of saturated steam at 2 to 12 Kg/cm.sup.2 pressure and 120 to 190.degree. C temperature for a period of time sufficient to allow the core to reach a suitable temperature. The number of cycles is preferably 10 or less. Advantageously, the inventive drying treatment prevents efflorescence and warping of the boards.

REFERENCES:
patent: 3250836 (1966-05-01), Ulfstedt
patent: 3327032 (1967-06-01), Adams

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