Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1995-09-12
1997-02-11
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34114, 34117, F26B 1102
Patent
active
056008988
ABSTRACT:
The paper dryer section has a single tier of all top felted dryer rolls seven to nine feet in diameter. Air caps are employed over the dryer rolls to simultaneously dry both sides of the web to prevent curl and to increase drying rates. The air caps employ blown air at a temperature of 200-1,000 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The felt employed is foraminous with a permeability of between 300-1,500 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 1,000 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. A single dryer roll, or more advantageously, two vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and, at the same time, support and transport the web between dryers.
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Deshpande Rajendra D.
Pulkowski Jeffrey H.
Archer David J.
Beloit Technologies Inc.
Bennett Henry A.
Campbell Raymond W.
Doster Dinnatia
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