APPARATUS AND METHODS OF MAKING A GLASS TUBE BY DRAWING FROM MOLTEN GLASS
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United States of America Patent
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Aug 20, 2015
app pub date -
Aug 29, 2013
filing date -
Aug 30, 2012
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Abstract
A glass tube making apparatus comprises a forming device with a shaping member positioned within a downstream portion of an outer tube. In further examples, methods of making a glass tube include the steps of passing a quantity molten glass through an upstream portion of the outer tube, wherein the molten glass includes a first cross-sectional shape. The method further includes the step of passing the quantity of molten glass through a downstream portion of the outer tube, wherein the first cross-sectional shape is transitioned to a second cross-sectional shape. In still further examples, methods of making a glass tube include the step of modifying a cross-sectional shape of the glass tube with an air bearing.
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