Mold and molding method

Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...

Reexamination Certificate

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C425S569000, C425S812000

Reexamination Certificate

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08033819

ABSTRACT:
A mold includes a gate communicating with the entire perimeter of a cavity serving as a space configured to form a molded article. A self-curable molding material with flowability is fed into the perimeter of the cavity through the gate; hence, the mold has a small number of dead ends compared with the case where, for example, the molding material is fed into the cavity through a part of the cavity, preventing the formation of bubbles left in the cavity. The arrangement of a gate and a vent each making an acute angle results in the spontaneous separation of the molded article in the cavity from solidified material portions in the gate and the vent due to shrinkage on curing.

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U.S. Appl. No. 12/392,363, filed Feb. 25, 2009, Yoshioka et al.

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