Thermal roll for papermaking with a fluid circulation system and method therefor
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United States of America Patent
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Jan 27, 2004
Grant Date -
Sep 25, 2003
app pub date -
Mar 22, 2002
filing date -
Mar 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermal roll for efficiently transferring heat to or from a web is provided. The thermal roll includes a rotatable outer shell having a cylindrical outer mantle and a stationary inner shell within the rotatable outer shell. An annular space is defined between an inner surface of the rotatable outer shell and an outer surface of the stationary inner shell. The annular space of a relatively low volume is filled with a heat exchange fluid, such as oil or water, that exchanges heat with a fibrous web through the mantle of the rotatable outer shell. The low volume of the annular space enables high heat transfer rates to the web and quick and efficient changes to the temperature of the heat exchange fluid. The thermal roll is adaptable for use as various types of rolls, such as calender rolls, press rolls, drying cylinders, and Yankee cylinders.
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