Method of producing gypsum/fiber board, especially for floor boa

Details Method of producing gypsum/fiber board, especially for floor boa Method of producing gypsum/fiber board, especially for floor boa

1991-03-11

1992-10-13

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 37, 264102, 264115, 264117, 264120, 264122, 264DIG69, B28B 300, B29C 6702, D21B 104

Patent

active

051548747

ABSTRACT:
Gypsum/fiber board, especially for use as floor board, is fabricated by paring a binder consisting of at least 60% by weight of calcium sulfate alpha hemihydrate, and at most 35% by weight calcium sulfate beta hemihydrate, the balance, if any, inert material such as grinding residues from finished plaster board, in an amount of 100 parts by weight of the binder to 20 parts by weight of fiber, especially cellulose fiber or a mixture of cellulose fiber from scrap paper with reinforcing fiber. This dry mixture combined is with water in an amount such that no water can be expressed from the prepared mix by the subsequent pressing step and the prepared mix is then pressed in a peripherally-closed form such that the finished gypsum/fiber board will have a raw density of at least 1.5 g/cm.sup.2.

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