Method of controlling the diameter of a clear extruded tube

Details Method of controlling the diameter of a clear extruded tube Method of controlling the diameter of a clear extruded tube

B - Operations, Transporting

29

C

B29C 47/92 (2006.01) A22C 13/00 (2006.01) B29D 23/00 (2006.01)

Patent

CA 2282927

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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