Method for controlling curl with dryer aircaps

Details Method for controlling curl with dryer aircaps Method for controlling curl with dryer aircaps

1999-01-11

1999-08-10

Bennett, Henry

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34454, 34461, 34116, F26B 300

Patent

active

059339802

ABSTRACT:
The dryer section in a papermaking machine has a single tier of all top felted dryer rolls six 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 250-900 degrees Fahrenheit and air speeds of 8,000-40,000 feet per minute. The dryer fabric employed is foraminous with a permeability of between 300-1,200 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. A single transfer roll, or more advantageously, two grooved 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 dryer rolls.

REFERENCES:
patent: 3134653 (1964-05-01), Justus et al.
patent: 5152076 (1992-10-01), Virta et al.
patent: 5311672 (1994-05-01), Kotitschke et al.
patent: 5495679 (1996-03-01), Deshpande et al.
patent: 5522151 (1996-06-01), Deshpande et al.
patent: 5553392 (1996-09-01), Hanaya
patent: 5600898 (1997-02-01), Deshpande et al.
patent: 5630285 (1997-05-01), Kerttula et al.
patent: 5647141 (1997-07-01), Hanaya

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