METHOD TO MANUFACTURE MINERAL BOARD AND MINERAL BOARD Russian patent published in 2015 - IPC E04B1/74 

FIELD: construction.

SUBSTANCE: in the method to manufacture a mineral board, where they mix and homogenise initial raw water suspension in a raw materials tank, containing mineral fibre, a filler, binding substances, they feed and distribute the produced initial raw water suspension on a moving latticed conveyor, the initial raw water suspension is dehydrated using a self-flow gravity drainage and vacuum drainage to produce the main wet mat, the main wet mat is dried and shaped, additional treatment of the main mat is performed, and additional coatings are applied onto the surface of the dried main mat, they mix and homogenise the initial raw water suspension in the raw materials tank, which contains mineral fibre in the amount of 30-80%, a filler containing swollen perlite in the amount of 5-40%, clay in the amount of 5-30% at if required calcium carbonate in amount of not more than 20%, binding substances, which include starch in amount of 2-11% and if required cellulose binder in the form of paper in amount of not more than 10% of the total mass of dry solid substances of the board, they mix and homogenise in the additional raw materials tank the additional raw water suspension, containing liquid glass in the amount of 0.5-15% and/or thermosetting binder in the amount of 0.5-10% and if required clay in the amount of not more than 25% on the basis of total clay content in the mineral board equal to 5-30% and/or starch in the amount of not more than 9% on the basis of the total content of starch in the mineral board 2-11%, they apply the prepared water suspension in the form of foam with the help of a foam generator on the main wet mat with dehydration of the initial raw water suspension using vacuum drainage. At the same time in the mineral board local concentrations of components introduced as foam are gradually reduced along the thickness of the board in direction from the face to the rear side of the board, and local density of the board gradually decreases along the board thickness in direction from the rear to the face side of the board, and its value on the rear side of the board is not more than 1.2 times higher than its value on the face side of the board.

EFFECT: reduced energy costs for manufacturing of mineral boards and possibility to produce boards with improved quality characteristics.

2 cl, 3 dwg, 1 tbl