Process to purge polymer or plastic melt guiding parts of film extrusion systems
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United States of America Patent
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Apr 5, 2005
Grant Date -
May 30, 2002
app pub date -
Sep 18, 2001
filing date -
Sep 18, 2000
priority date (Note) -
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Abstract
A process to purge film extrusion systems with at least one extruder for the purpose of changing batches, wherein the speed is changed periodically in at least that part of the extruder in which the material is changed. By considering the mass flow rate of the film extrusion system, advantageous improvements of the process avoid the situation in which the film tears off. To this end, at least one selected guide extruder is operated at a speed which is increased as compared to the normal operation, and at least one selected downstream extruder is operated at a speed that is decreased as compared to the normal operation. Also included are control and operating units and extrusion systems to carry out the process, which include, among other things, the elements necessary for an automated program run of the purging program and the optical display of the parameters of the same.
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