Method of controlling the diameter of a clear extruded tube
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United States of America Patent
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Jul 24, 2001
Grant Date -
N/A
app pub date -
Apr 22, 1999
filing date -
Apr 22, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for controlling the diameter of a clear extruded molten tube wherein the extruded tube contains a volume of a clear liquid and the level of the liquid is indicative of the tube diameter so the level rises as the tube diameter decreases. A light beam passing through the tube is refracted from a straight line path when the liquid level rises above the level of the beam. The refracting of the beam in turn triggers the introduction of air into the extruded tube to increase the diameter of the extruded, molten tube.
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