Air heating and control system

Details Air heating and control system Air heating and control system

1998-09-16

2000-08-08

Wilson, Pamela A.

Drying and gas or vapor contact with solids

Apparatus

With automatic control

34553, 34117, 34119, 34124, 100 38, 219483, F26B 1900

Patent

active

060983116

ABSTRACT:
An air heating and control system, which in one application controls the diameter of a calender roll in the paper making process, includes a row of heater packs proximate to the various zones of the calender roll. Each heater pack has a plurality of electrical heating coils which are at least partially connected in parallel so that failure of one coil does not interrupt power to the remaining coils. Air flowing through the heating coils is heated to a desired temperature and impinges upon the calender roll to expand it as desired. A control system senses a defective coil, which effectively reduces current in a heater pack, and increases the voltage imposed upon that heater pack to again produce the desired power level or heating effect. Thus failure of a heating coil is immediately compensated for.

REFERENCES:
patent: 3789190 (1974-01-01), Orosy et al.
patent: 4573402 (1986-03-01), Sharma et al.
patent: 4675509 (1987-06-01), Hell
patent: 5340964 (1994-08-01), Galloway et al.

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