Preventing air film between web and roller

Details Preventing air film between web and roller Preventing air film between web and roller

1981-04-16

1983-01-25

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 23, 34120, 34122, 34160, F26B 500

Patent

active

043695841

ABSTRACT:
A web moving in one direction and having partial wrapping engagement with a cylindrical surface of a rotating roller is impacted by an air jet which forces it into intimate contact with the roller, preventing intrusion of an air film between the roller and the portion of the web curved around it. The jet issues from a nozzle to which pressure air is fed (at, e.g., 3 psi) and the outlet of which is a slot long enough to extend across the full width of the web but as narrow as feasible, e.g., 0.030 in. The nozzle is so arranged that the jet impacts the web within a short distance (e.g., 1/2 in.) in the direction of web travel from the line of tangency of the web to the roller, and is close enough to the web (e.g., about 1/8 in.) to avoid substantial dispersion or divergence of the jet before it impacts the web. Effectiveness of the jet is due to the high pressure gradient in the direction of web travel that it imposes upon the web, not to absolute pressure.

REFERENCES:
patent: 3452447 (1969-07-01), Gardner
patent: 3633284 (1972-01-01), Rodwin
patent: 3733711 (1973-05-01), Haythornthwaite

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