Method for reducing diameter of a glass rod or tube by drawing

Details Method for reducing diameter of a glass rod or tube by drawing Method for reducing diameter of a glass rod or tube by drawing

1985-01-16

1986-08-26

Lindsay, Robert

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 2, 65 64, 65 87, 65102, C03B 37027, C03B 2313

Patent

active

046080716

ABSTRACT:
The invention provides an efficient and accurate method for reducing the diameter of a rod or tube of glass, e.g. fused quartz glass rod as a base material of optical fibers, by drawing when the rod or tube is heated and in a softened and plastically deformable state. Different from conventional methods in which the glass rod or tube is held in a horizontal disposition and drawn in the horizontal axial direction or the rod or tube is held vertically and drawing is effected by the downward movement of the lower grip, the rod or tube in the inventive method is held vertically and drawing thereof is effected by the upward movement of the upper grip along with the gradual downward shift of the heating zone relative to the lower grip so that the problems in the prior art methods such as warp and an uneven diameter profile of the drawn rod or tube can be minimized.

REFERENCES:
patent: 3582305 (1971-06-01), Dunlap et al.
patent: 4012213 (1977-03-01), Haggerty et al.
patent: 4061484 (1977-12-01), Aulich et al.

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