Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1978-10-16
1981-02-24
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
264314, 264317, B28B 732
Patent
active
042527600
ABSTRACT:
The invention pertains to the manufacture of articles of thermosetting plastics and other materials. In a first stage, a solid article is formed from a particulate material by introducing such material into a first chamber defined partially by the backing surface of a backing member and partially by the opposed pressing surface of a pressing member. The backing member is frangible and is removably mounted on a support. The first chamber is then closed and the pressing member advanced toward the backing surface to contract the first chamber and compress the particulate material between the pressing and backing surfaces to form the solid article. The pressing member is then retracted, the first chamber is opened, and the backing member and solid article are removed from the support as a unit. Finally, the backing member is fractured and the fragments are removed from the solid article. In a second stage, the convoluted article, or any other similar body is supported in a chamber structure. A filler is disposed between the body and the chamber structure in contact with at least a major portion of the exposed surfaces of the body. The filler and body are then heated, while restricting movement of the filler.
REFERENCES:
patent: 3897531 (1975-07-01), Overhoff et al.
patent: 3956452 (1976-05-01), Saito
Foster Robert D.
Weeden Frank G.
Czaja Donald E.
Hall James R.
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