| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the inner side of a ceramic screw type lid of a screw typed rugged shape, the base of which must be manufactured from a plaster mold type material, enables no removal of the inside mold or no molding in the case of the conventional plaster mold divided into inside and outside, and that it takes much labor and time for postadhesion processing even if the right and left half parts are separately molded with the plaster mold. SOLUTION: The precision plaster molds for the inside and the outside of the lid are molded by adapting to the outside of a threaded mouth of a container on which the lid is put. Slip is cast into the mold, half-dried, and the outside mold (Fig. 1-A) is removed first. The outside surface of the material (Fig. 1-C) is dried to the extent of not leaving the marks even it is touched on the outside surface, and the plaster mold (Fig. 1-B) of the inside and the material (Fig. 1-C) are rotated in the screw type together to remove them from the mold. COPYRIGHT: (C)2007,JPO&INPIT
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