Method of making a textured gypsum- and chip-board, method of obtaining a textured composite material consisting of gypsum and organic fibre, method of making a textured article, method of making a mould for producing superficial texture on a hardened gyp

摘要

An improved method for texturing gypsum fiber panels and producing surface textured panels, edge tapers, and deeper patterned wainscot-type panels, involving the use of a flexible die with a textured surface. The die is pressed onto the panel in its slurry state just after the onset of an exothermic rehydration reaction. Partial hydration and setting occur during pressing by the die to form a textured mat. The mat is removed from contact with the die at a point along the rehydration temperature curve about at or less than one-half of the rise to the greatest rehydration temperature.