Decorative air bubble formation in a glassware article

Details Decorative air bubble formation in a glassware article Decorative air bubble formation in a glassware article

1979-06-14

1981-03-03

Smith, William F.

Glass manufacturing

Processes

Forming product or preform from molten glass

65132, 65129, 65330, 65332, 65 22, C03B 708

Patent

active

042538629

ABSTRACT:
A glass article such as a sham bottom tumbler with decorative air bubble encapsulated in its base is produced on existing automatic glass-forming machines by injecting a bubble of air into a charge of molten glass in the gob-forming section of a glass furnace as the charge is being formed into a gob. This is accomplished by providing an air supply tube in the gob-forming plunger. Preferably, the lower tip of the tube extends below the lower tip of the plunger. Puffs of compressed air are supplied in synchronism with the plunger cycle so an air bubble is formed in the lower end of the gob, and the gob is then formed by normal procedures into a finished article.

REFERENCES:
patent: 1592299 (1926-07-01), Howard
patent: 1995276 (1935-03-01), Howard

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