Method for collapsing a hollow substrate tube into a rod-like preform while heating
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United States of America Patent
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Issued Date -
Sep 4, 2003
app pub date -
Dec 26, 2002
filing date -
Dec 28, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a method for collapsing a hollow substrate tube into a rod-like preform while heating by reciprocating a heating element along the length of the substrate tube. The present invention is characterized in that a constant electric power is supplied to the heating element during collapsing.
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