B - Operations – Transporting – 30 – B
Patent
B - Operations, Transporting
30
B
92/21.2
B30B 15/34 (2006.01) B30B 3/00 (2006.01) D21F 3/02 (2006.01)
Patent
CA 1316032
ABSTRACT OF THE DISCLOSURE The disclosure describes a drum or roll which may be heated to high operating temperatures and is particularly useful in situations where a high heat flux is required under conditions of high nip and distributed loads on the drum. It consists of a relatively thin rotating shell supported on an axially located stationary inner core. The core has a plurality of shell support bearings. These have close radial clearances with the inner surface of the shell at each location where an external nip roll would be engaged. The spaces between the shell support bearings form pressurizable chambers. These chambers can be filled with a hot pressurized fluid for supporting the shell between the supports located at the nip positions. In one application the roll would be used as the drum in a belt and drum press having light nip loads at several locations and high distributed loads applied by a tensioned belt. The fluid support system for the rotatable shell enables a very thin shell to be used. This permits the desired heat flux while still maintaining the mechanical integrity to support the applied loads. Operating temperatures of the roll could range up to 425°C with multiple nip loads typically being up to 180 - 350 kilograms per linear centimeter and 690 - 6900 kPa unit pressure, and with dis- tributed loads between the nips of up to 340 kPa. High thermal conduc- tivity materials such as copper or aluminum may be used as shell mater- ial to reduce temperature differential and thermal stress.
593898
Miller Ray Ramsay
Osler Hoskin & Harcourt Llp
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