PURPOSE: To manufacture a consistent quality molding easily and continuously by allowing a mold to rotate at two different speeds: low rotational speed to make a molding material stick uniformly to the inside face of a molding and a high speed to dehydrate the molding material.
CONSTITUTION: A mold in which the ratio of the area of drain holes to that of a surface is 0.1 to 1.0% and the diameter of an individual hole is 0.1 to 5mm is used. Dehydrating molding is performed by making a mold rotate around the central axis. Dehydrating molding is performed in two stages, first at a low rotational speed and then at a high rotational speed. Practically a total amount of a molding material is deposited from slurry and stuck to the inside face of the mold at an even thickness during a low rotational speed. In consequence, a reinforced tubular molding of consistent quality can be obtained easily even if accurate molding conditions and a complex type of equipment are not used.
MIYAZAKI HIROSHI
MATSUOKA SHIRO
