摘要 |
<p>PURPOSE:To solve the trouble of warpage developing by curing and hardening by a method wherein a water-containing lightweight aggregate, which is prepared by adding water in advance, is employed as the aggregate of a powdered mixed material for forming a second layer in the manufacturing method of an inorganic cement plate through curing and hardening. CONSTITUTION:Firstly, a green sheet formed out of an aqueous slurry mainly consisting of cement, an aggregate and a fibrous component by a paper-making method as a first layer, on the top surface of which a paste-like powdered mixed material mainly consisting of cement, in aggregate and a fibrous component is placed so as to form a second layer in order to produce a double-layered plate. After that, an uneven pattern is formed on the top surface of the second layer by pressure-forming. The resultant double-layered plate is cured and hardened. In the manufacturing method of inorganic cement plate as just mentioned above, as the aggregate of the powdered mixed material for forming the second layer, a water-containing lightweight aggregate, which is prepared by adding water in advance, is employed. Thus, by the amount of the water added in the water-containing lightweight aggregate, the water content of the second layer becomes almost that of the first layer.</p> |