Title:
PREPARATION OF CERAMIC AND POROUS MOLD THEREFOR
Document Type and Number:
Japanese Patent JP2736004
Kind Code:
B2
Abstract:
PURPOSE: To prepare a hanging insulator with good quality with an extremely high yield by using a porous mold wherein the water absorption rate of a mold main body of the porous mold is higher on the surface side part of the outer peripheral part of the mold than on the central part of the mold.
CONSTITUTION: A porous plaster mold for molding a hanging insulator is provided with a form 1 and a porous plaster mold 2 molded by cast molding and with open cells on its inner face and the mold main body 2 has a porous mold surface part 7 of the mold outer peripheral part and the mold central part 8 each with the mold surfaces 3 and 6 corresponding to the outer shapes of a large-sized shade part and a small-diameter central core part of the hanging ceramic to be molded and a porous tube 4 is embedded inside only along the mold surface 3 of the mold surface part 7. Therefore, when the water absorption rate is measured, the water absorption rate of 20-30% is measured at the mold surface side part 7 of the mold outer peripheral part and the water absorption rate of 10-20% is measured at the head top part 8a of the mold central part 8. In addition, this water absorption rate can be made larger at the mold surface side part 7 of the mold outer peripheral part than that at the mold central part 8.
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Inventors:
KATO HIDEKI
Application Number:
JP32478293A
Publication Date:
April 02, 1998
Filing Date:
December 22, 1993
Export Citation:
Assignee:
NIPPON GAISHI KK
International Classes:
B28B1/26; B28B7/12; B28B7/34; (IPC1-7): B28B1/26; B28B7/12
Domestic Patent References:
| JP5339068A | ||||
| JP323903A | ||||
| JP6186208A |
Attorney, Agent or Firm:
Akihide Sugimura (9 outside)