Process and apparatus for producing a dry-pressed moulding from

Details Process and apparatus for producing a dry-pressed moulding from Process and apparatus for producing a dry-pressed moulding from

1986-12-05

1988-11-29

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Bulk deposition of particles by differential fluid pressure

264119, 264120, 425398, 4254051, 425408, B29C 5900

Patent

active

047880236

ABSTRACT:
A process and apparatus for producing a dry-pressed molding from a particulate or granular molding material such as a ceramic molding composition in which the composition is initially drawn into a loading cavity by applying a vacuum thereto. The loading cavity is formed by a first mold half and a shooting head having a molding surface the shape of which determines the shape of a premolding which is formed upon entry of the composition into the loading cavity and sufficiently compressed to retain its shape after the shooting head has been removed to allow a second mold half to be positioned over the first mold half. The shape of the part of the premolding formed by the shooting head molding surface differs from that of the second mold half in such a way that, on final pressing, the compression starts in the areas of relatively greater thickness of the premolding before it starts in the areas of relatively smaller thickness so that the compression ratio is maintained approximately constant over the whole of the area of the molding.

REFERENCES:
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patent: 3664799 (1972-05-01), Wallick, Jr. et al.
patent: 4128375 (1978-12-01), Schubart
patent: 4330250 (1982-05-01), Pinkas
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patent: 4473526 (1984-09-01), Buhler
patent: 4501714 (1985-02-01), Strobel et al.
patent: 4544345 (1985-10-01), Buhler et al.
Apfelbeck, "Ein neuer Weg zer mechanisierten Fertigung von Tellern." Keramische zeitschrift, 14 Jahrgang, NR2, 1962.

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