Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work – Work is organic material
Patent
1975-10-17
1977-06-07
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
Work is organic material
164 7, 164 72, 164160, 164349, 264 92, 264112, 264128, 264129, 264220, 264232, 425388, B22C 300, B29C 1704
Patent
active
040284557
ABSTRACT:
A method for producing a reduced-pressure shaped mould comprises the steps of placing a pattern having gas-permeable orifices on a surface plate and adhering a coating film that is soluble in a solvent to the pattern by suction through the orifices. A flask having evacuating means is then placed on the surface plate on top of the film and the space portion defined by the film and the flask is filled with solid particles containing no caking agent which serves as a mould material. The mould material and flask are covered with an air-tight sheet and the evacuating means of the flask is actuated while that of the surface plate is released so that the sheet and coating film adhere to the upper and low surfaces respectively of the mould material by suction. The pattern and surface plate are then separated from the flask and a solution containing caking agent dissolved in the solvent is applied to the coating film which is adhered to the surface of a cavity formed at the lower surface of the mould material. The caking agent penetrates interstices between the solid particles whereby a layer that has been hardened by the caking agent may be formed in a surface layer portion bounding the cavity.
REFERENCES:
patent: 3955266 (1976-05-01), Honami et al.
Ono Shuzi
Sakaguchi Hiroshi
Tsunoda Hideo
Ueda Shoji
Mitsubishi Jukogyo Kabushiki Kaisha
Silbaugh Jan H.
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