Curl control with dryer aircaps

Details Curl control with dryer aircaps Curl control with dryer aircaps

1996-05-30

1999-08-10

Bennett, Henry

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34114, 34117, F26B 1102

Patent

active

059339772

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), Desphande et al.
patent: 5630285 (1997-05-01), Kerttula et al.
patent: 5647141 (1997-07-01), Hanaya
"Thermal Contact Conductance of a Moist Paper Handsheet/Metal Interface"-Asensio et al.-1991.

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