A method for making gypsum wall board in which during the production of the board pressure is applied to a portion or all of the board surface to reshape, compress and densify the gypsum core to change the shape or contour the face surface of the gypsum board. The pressure must be applied in a systematic...http://www.google.com.au/patents/US5198052?utm_source=gb-gplus-sharePatent US5198052 - Method of reshaping a gypsum board core and products made by same
