Coating processes – With post-treatment of coating or coating material – Solid treating member or material contacts coating
Patent
1991-01-31
1992-05-12
Beck, Shrive
Coating processes
With post-treatment of coating or coating material
Solid treating member or material contacts coating
118410, 118411, 118413, B05D 312
Patent
active
051126532
ABSTRACT:
A method of and apparatus for applying coating liquid to a web of paper traveling over a web supporting surface at speeds of 3,000, 4,000 and more feet per minute to produce a coated web free of streaking and other imperfections comprises apparatus for and the sequential steps of distributing coating liquid in a turbulent state over the supported web through a limited application zone within a very short dwell time of the turbulent liquid on the web; subjecting the coating liquid on the supported web to an initial doctoring by means of a primary doctor blade biased under pressure against the coated web at the rear edge of the application zone to form on the web downstream from the zone a relatively quiescent layer of coating liquid having a wet film thickness sufficiently in excess of the final wet film thickness to accommodate a subsequent final wet film doctoring of the coating liquid on the web; and, a a location downstream and isolated from the application zone, subjecting the relatively quiescent layer of excess coating liquid on the supported web to a final docttoring by means of a final doctor blade biased under pressure against the coated web to remove the excess coating from the web and to level and smooth the coating retained on the web to final wet film thickness and smoothness.
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Damrau Wayne A.
Mayer Michael A.
Bashore Alain
Beck Shrive
Consolidated Papers Inc.
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