| abstract |
Fibre-containing building components are produced by forming a mat from mixtures of fibrous substances with sulphate-type binders and water. The quantity of water is here many times greater than that required for setting of the sulphate-type binders. The major quantity of the excess water is mechanically removed from the mat before the start of the setting process, and the mat is formed to give a moulding which is dried after setting. The essential point is that a calcium sulphate hemihydrate is used as the sulphate-type binder. Its specific particle surface area changes only insignificantly in the aqueous suspension, or not at all, until the major quantity of the excess water has been removed mechanically from the mat. The novel process makes it possible to improve the output capacity of the winding-roll machines used in the manufacture of plasterboard, and to work with Fourdrinier machines, using sulphate-type binders. |