Air knife

Details Air knife Air knife

1990-07-23

1991-12-24

Hoag, Willard E.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Condition of coated material

118 63, 118 68, 427 8, 427348, B05C 1102

Patent

active

050742426

ABSTRACT:
An air knife formed of a plurality of independently controllable pressure chambers for permitting gas in an assortment of differential pressures to be simultaneously discharged from separate segmental portions along the length of the air knife nozzle in order to produce an essentially uniform and desired coating thickness on a continuously moving and continuously coated workpiece regardless of strip thickness, width, camber, and velocity. The air knife includes a plurality of baffles positioned inside the barrel of the air knife for dividing the barrel into at least three distinct pressure chambers. The baffles are adjustably positionable along the length of the barrel in order to establish the desired segmental lengths along the air knife nozzle from which the differentially pressurized gas is discharged from the air knife. In the preferred embodiment, a computer continuously adjusts and controls the pressure in each chamber, and the position of air knife with respect to the workpiece.

REFERENCES:
patent: 3190261 (1965-06-01), Ziffer
patent: 3499418 (1970-03-01), Mayhew
patent: 3995478 (1976-12-01), Wilhelm
patent: 3998181 (1976-12-01), Bellen et al.
patent: 3998182 (1976-12-01), Mayhew
patent: 4337725 (1982-07-01), Voelker et al.
patent: 4524716 (1985-06-01), Mueller
patent: 4655166 (1987-04-01), Nishimura et al.

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