Process for Manufacturing a product and a product of gypsum board gypsum board / Wood Fiber with improved resistance against Water

摘要

A process to manufacture a gypsum board product, which has an improved resistance against water. Said process includes; adding an aqueous wax emulsion to an aqueous suspension of a calcium sulfate and grass particle material, the emulsion is stable under the conditions at which the suspension is maintained; pass the suspension containing the wax on a flat and porous formation surface to form a filter cake; remove a portion of the water from the fitlro cake through the porous surface; press the filter cake to form a spreader and remove the additional water;Then dry the dashboard and pump out the rest of the water, allowing the center of the earth to drag away enough time from the dashboard to melt the wax.