Web dryers or the like having airfoil means for controlling a ru

Details Web dryers or the like having airfoil means for controlling a ru Web dryers or the like having airfoil means for controlling a ru

1989-04-24

1990-05-08

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

226 97, 68 5E, F26B 1300

Patent

active

049226282

ABSTRACT:
A web dryer for floatingly suspending a running web and having a horizontal exit slot through which the web exits from the dryer, makeup air being drawn into the dryer through said slot and in a direction opposite to that of web exit movement. The running web is forced to move up or down based on the fluctuations in air movement and which cause the web to billow across its width, a rotatable roll arranged is in parallelism to the exit slot and located downstream from the web exit slot and around which roll the moving web is wrapped. The web, due to said tendency to billow across its width, thereby creates a tight side of the web around the roll and consequently transversely shifts to the tight side. An airfoil is located transversely across the web and adjacent and inside of the horizontal web exit slot, whereby the incoming makeup air is uniformly distributed transversely by the airfoil and across the web width to eliminate uncontrolled web billowing and consequent transverse shifting of the web. The airfoil has an outwardly inclined, trailing edge in respect to the direction of movement of the incoming makeup air in a direction opposite to that in which the moving web approaches the airfoil, whereby said airfoil presents an area of negative pressure for the web passing thereover.

REFERENCES:
patent: 3662476 (1972-05-01), Capizzi
patent: 3763571 (1973-10-01), Vits
patent: 4462169 (1984-07-01), Daane
patent: 4693014 (1987-09-01), Caflisch et al.
patent: 4785986 (1988-11-01), Daane et al.
patent: 4833794 (1989-05-01), Stibbe et al.
patent: 4837946 (1989-06-01), Hella et al.

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