Process for the production of a homogeneous ream-free body made

Glass manufacturing – Processes – Sequentially forming – reheating – and working

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Details

65102, 65111, 65DIG8, C03B 2304, C03B 2000

Patent

active

054436079

ABSTRACT:
A process for the production of homogeneous ream-free bodies made of quartz glass or made of a glass having a high content of silicic acid, in which an essentially bar-shaped initial body is twisted about its longitudinal axis in a shaping step to form a twisted body radially homogenized in layers having axial layering. To make it possible to produce homogeneous large-volume bodies, in at least one further shaping step the twisted body is then softened in a heatable mold under a force acting in the axial direction to deform it in a direction transverse to its axial direction into the mold and form a glass bar, the longitudinal axis of which extends essentially perpendicular to the layering. The glass bar is then twisted about its longitudinal axis.

REFERENCES:
patent: 3128169 (1964-04-01), Heraeus et al.
patent: 4358306 (1982-11-01), Okamoto et al.

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