Device and method for driving a preheating roll assembly in a calender unit
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United States of America Patent
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Jul 13, 2010
Grant Date -
Jan 31, 2008
app pub date -
Nov 10, 2005
filing date -
Dec 16, 2004
priority date (Note) -
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Abstract
A device drives a preheating roll assembly comprising several rolls, during a heating or preheating stage. A motor assembly includes at least one individual drive and preferably two individual drives, which are used to drive at least the exit roll and preferably the entry roll and the exit roll. The motor assembly also includes one or more asynchronous motors, each asynchronous motor controlling the surface speed and the torque of one of the intermediate rolls. A common frequency converter operates one or more asynchronous motors, in particular all asynchronous motors.
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