Dry-type rubber pressing method

Details Dry-type rubber pressing method Dry-type rubber pressing method

1987-06-02

1989-12-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Plural, intermittent pressure applying

264109, 264314, 425389, 4254051, B29C 4314, B28B 2118

Patent

active

048881449

ABSTRACT:
Powder is filled in an axially elongate powder filling space defined 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: 4473526 (1984-09-01), Buhler et al.

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