Heatable roll for use in calenders and the like
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 23, 1990
Grant Date -
N/A
app pub date -
Apr 27, 1989
filing date -
May 2, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A calender roll wherein a cylindrical shell is rotatably mounted on a stationary carrier by way of bearings which are disposed in the end portions of the shell. The median portion of the shell is heated by a first heating device, and the end portions of the shell are heated by a discrete second heating device. The second heating device has channels which are provided in the end portions of the shell and/or indictive heaters which are adjacent to the exterior of the end portions of the shell. Alternatively or in addition to such expedients, the second heating device can include the bearings in the end portions of the shell; each such bearing includes or constitutes an axial or radical hydrostatic bearing which is heated by hydraulic fluid to thereby heat the respective end portion of the shell. The second heating device ensures that the effective length of the shell approximates or even matches the axial length of the shell.
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