High velocity web floating air bar having a recessed Coanda plat

Details High velocity web floating air bar having a recessed Coanda plat High velocity web floating air bar having a recessed Coanda plat

1978-10-12

1980-05-06

Christian, Leonard D.

Advancing material of indeterminate length

By fluid current

And web storage

34156, B65H 1732

Patent

active

042013232

ABSTRACT:
An air bar for floating a running web and having two spaced apart air nozzles through which pressurized air is directed against the web to form a supporting air cushion for the web. The nozzles are elongated slots extending transversely of the web and which are positioned at each edge of an intervening plate that also is located transversely of and closely adjacent the running web. The plate has curved edges, one located adjacent each of the slots whereby the air issuing from the slots tends to follow the curvature of the curved edges, thereby tending to direct the two issuing jets of air from the slots towards one another. The plate, commonly referred to as a Coanda plate, has a recessed portion between the slots and which is located inwardly or below the slots to thereby create a sufficient space between the web and the plate to cause generation of air turbulence, vortexes and eddy currents in the pressurized air zone or cushion between the web and the plate, which results in increased floatation pressure for the web and increased heat transfer of the material, such as printing, which is on the web.

REFERENCES:
patent: 3324570 (1967-06-01), Flaith et al.
patent: 3498515 (1970-03-01), Johnson
patent: 3549070 (1970-12-01), Frost et al.
patent: 3873013 (1975-03-01), Stibbe

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