Dry-type rubber pressing apparatus

Details Dry-type rubber pressing apparatus Dry-type rubber pressing apparatus

1987-12-21

1990-06-19

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

Isostatic type

264313, 425420, 425DIG14, 425DIG44, B29C 4310

Patent

active

049349198

ABSTRACT:
Powder is filled in an axially elongate powder filling space defiined in a flexible pressure tube, and the pressure-bearing surface of the flexible pressure tube is pressurized with a pressurizing fluid, from a wall portion of the pressure tube which corresponds to a localized region of the powder filling space progressively toward another wall portion of the pressure tube which corresponds to an end of the powder filling space, until the pressure-bearing surface of the pressure tube is pressurized in its entirety, thereby compacting the powder in the powder filling space. Therefore, air in the powder is progressively squeezed toward the end of the powder filling space where the air can be discharged. Thus, no air remains trapped in the powder, and a formed product is prevented from being damaged, which enables elongate products to be produced.

REFERENCES:
patent: 2838796 (1958-06-01), Reed
patent: 4097977 (1978-07-01), Pollner
patent: 4133626 (1979-01-01), Schubart
patent: 4349326 (1982-09-01), Foster et al.
patent: 4473526 (1984-09-01), Buhler et al.
patent: 4564352 (1986-01-01), Pettersson

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