Air caps for two tier double felted dryer

Details Air caps for two tier double felted dryer Air caps for two tier double felted dryer

1996-08-20

1997-10-21

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34114, F26B 1102

Patent

active

056783213

ABSTRACT:
A new dryer section or an existing dryer section of the two tier double-felted type has air caps disposed over the upper dryer rolls to simultaneously dry both sides of the web to increase drying rates. The heated pressurized air is blown through multiple air impingement holes in the air cap nozzle plates to impinge the web at a temperature of 500-900 degrees Fahrenheit and air speeds of 20,000-40,000 feet per minute. The dryer fabric employed is foraminous with a permeability of between 400-1,200 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 900 degrees Fahrenheit and average temperatures of between 500-600 degrees Fahrenheit. The design of the air caps utilizes recirculation of the blowing air to control drying rates.

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"Thermal Contact Conductance of a Moist Paper Handsheet/Metal Interface," Asensio, Seyed-Yagoobi, Fletcher, and Pulkowski, HTD-vol. 180, pp. 57-63, Fundamentals of Forced and Mixed Convection and Transport Phenomena, ASME 1991.

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