| abstract |
(57) [Summary] [Purpose] When manufacturing an extruded board using anhydrous gypsum neutralized with slaked lime as a raw material, the curing rate of anhydrous gypsum is accelerated to increase the initial strength and improve productivity. At the same time, a gypsum board having high bending strength is obtained. (Structure) The method for producing a high-strength gypsum board of the present invention comprises a type II anhydrous gypsum, slaked lime, a fiber and a filler as a raw material, and a thickener added thereto, and as a hardening accelerator for the type II anhydrous gypsum. , Potassium sulphate, aluminum sulphate and one or more kinds of sodium salts are added and extrusion molding is performed. |