Method of applying vacuum while constricting the neck portion

Details Method of applying vacuum while constricting the neck portion Method of applying vacuum while constricting the neck portion

1976-06-29

1978-01-03

Bashore, S. Leon

Glass manufacturing

Processes

Forming product or preform from molten glass

65 70, 65 75, 65 81, 65122, 65123, 65124, 65130, 65329, C03B 900, C03B 530

Patent

active

040664287

ABSTRACT:
Molding of hollow glass articles wherein a gob flows from a feeder into a mold and forms a hollow tube as it enters the mold, and a pressure differential is applied across the tube so that the tube is shaped in the mold to form the hollow article. During application of the pressure differential, deformation of the glass between the feeder and mold, is prevented by proximately positioning of the feeder and mold. This pressure differential is obtained by applying vacuum between the mold and molten tube.

REFERENCES:
patent: 2790994 (1957-05-01), Cardot et al.
patent: 3967947 (1976-07-01), Gunthner

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