B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
117/108, 32/28
B05C 11/06 (2006.01) B05B 1/04 (2006.01) B05D 1/42 (2006.01) C23C 2/20 (2006.01)
Patent
CA 1082912
APPARATUS FOR LIQUID COATING THICKNESS CONTROL, FLUID NOZZLE AND METHOD OF REMOVING EXCESS LIQUID COATING FROM WEB EDGES Abstract of the Disclosure A nozzle and associated apparatus for controlling the thickness of liquid coating on continuous webs which produces a thin jet of fluid for impingement across the width of moving web having a liquid coating thereon, the fluid in the portions of the jet on either side of the center of the nozzle having com- ponents of motion toward the edges of the web. One form of nozzle structure for achieving such lateral movement of the fluid issuing from the nozzle has a centrally positioned fluid inlet port to an inner plenum chamber, the port having a cross sectional area at least several times the cross sectional area of the nozzle orifice. Another form of nozzle structure for accomplishing this purpose involves baffle means in the path of the fluid flowing through the nozzle which changes the direction of flow of the fluid so as to give the fluid on either side of the center of the nozzle a component of motion toward the edges of the nozzle. Still another form of nozzle structure combines the foregoing features with the so-called curved orifice nozzle where operating conditions indicate the desirability of some build up of coating on the central portion of the web. The method involves impinging fluid against a liquid coating on a sur- face of a moving web with the fluid impinging against the liquid coating across the width of the web so that on either side of the center of the web there is a component of motion of the fluid toward each associated edge of the web, whereby excess liquid coating on the web has a component of motion toward each edge of the web.
243363
Johnson & Hicks
National Steel Corporation
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