Apparatus for drawing glass tubing

Details Apparatus for drawing glass tubing Apparatus for drawing glass tubing

1975-01-24

1978-09-05

Bashore, S. Leon

Glass manufacturing

Glassworking or preform by or with reheating means

Heating means movable relative to work during shaping operation

65278, 65280, 65276, 65292, 65297, 65109, C03B 2300, C03B 2100, C03B 2304

Patent

active

041116771

ABSTRACT:
Method and apparatus for providing a glass tube with a uniform nozzle portion, i.e., one which has a true centerline. The method involves suspending the tube on vertically space suspension points therealong, with the lower of the suspension points being arranged to apply a dead weight to the tube. The tube is rotated at the upper of the suspension points as it is heated above its vertical center to a temperature at which it becomes slightly plastic, but below the temperature at which the dead weight could significantly stretch the tube. This heating to the point of plasticity allows the dead weight to straighten out any axial deviations in the tube. Following the straightening, the tube is heated centrally to a higher drawing temperature sufficient to allow the dead weight to stretch the tube to a predetermined length and thereby provide a uniform necked down portion centrally of the tube. The necked down portion can then be severed at its midpoint to provide two glass electrode tubes.

REFERENCES:
patent: 2267108 (1941-12-01), Juvinall et al.
patent: 2282993 (1942-05-01), Dichter
patent: 3485613 (1969-12-01), Herczog et al.
patent: 3852054 (1974-12-01), Dichter

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