| 摘要 |
<p>Raw gypsum dihydrate (11) is dried in a dryer (12), pulverized by a pulverizer (13), calcined in a calcinator (14), re-pulverized in a pulverizer (15), providing gypsum hemihydrate, which is then once stored in a gypsum hemihydrate silo (16), and then the gypsum hemihydrate and a chip (22) are premixed in a premixer (30). The resulting kneaded product, water and, if necessary, various additive materials (agents) are kneaded in a continuous mixer (31), providing a raw material slurry, which is then slip-cast by a slip casting means (32), providing a gypsum board. Further, the flat surface of the chip is set at 30° or less with respect to a plane perpendicular to the direction of the thickness of the gypsum board. According to this technique, a gypsum board considerably superior in bending strength and screw or nail pull-out resistance and having various improved performances can be produced with good productivity and stability.</p> |
