Process of manufacturing gypsum products

Details Process of manufacturing gypsum products Process of manufacturing gypsum products

1978-04-25

1980-07-22

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Disparate treatment of article subsequent to working,...

Effecting temperature change

106109, 264235, 264237, 264348, C04B 1100

Patent

active

042139317

ABSTRACT:
In manufacturing gypsum products, crushed natural dihydrous gypsum CaSO.sub.4.2H.sub.2 O is molded and heat-treated in air at temperatures ranging from 100.degree. to 200.degree. C. The temperature is raised to a required level at a rate of 2 to 3 degrees per minute. The products are strengthened by watering.
The end gypsum products feature a water absorption of 7 to 10% and a frost resistance of 40 to 50 cycles. Their compression strength is 170 to 300 kg/cm.sup.2.

REFERENCES:
patent: 3311516 (1967-03-01), Jaunarajs et al.
patent: 3870538 (1975-03-01), Burkard et al.
patent: 3906083 (1975-09-01), George
patent: 3957522 (1976-05-01), Matsuo et al.

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