Process for making gypsum fiberboard

Details Process for making gypsum fiberboard Process for making gypsum fiberboard

1990-01-10

1990-10-30

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Removal of liquid component or carrier through porous mold...

By direct application of vacuum or pneumatic pressure

106783, 156 45, 264101, 264118, 264122, 264160, 264333, 264344, 264128, B29B 1506, B28B 1702, B29C 7100

Patent

active

049667394

ABSTRACT:
In the process for making gypsum fiberboard the boards are formed or molded rom a mash containing calcium sulfate dihydrate and fiberous material. By heating and subsequently cooling the boards the dihydrate is first converted into the hemihydrate and subsequently recrystallized again to the dihydrate. Known processes require day line setting times which are economically disadvantageous. According to the present invention these times are shortened by pulling or drawing water, an aqueous solution or a water containing mixture through the boards after the cooling step. Advantageously a setting accelerating agent can be dissolved in the water. By these features the setting time can be shortened to less than two hours. By addition of a binding agent, e.g. starch, to the fluid drawn through the boards the strength of the boards is increased.

REFERENCES:
patent: 3770859 (1973-11-01), Bevan
patent: 4127628 (1978-11-01), Uchida et al.
patent: 4239716 (1980-12-01), Ishida et al.
patent: 4392896 (1983-07-01), Sakakibara

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