Coating processes – With post-treatment of coating or coating material – Solid treating member or material contacts coating
Patent
1989-08-07
1990-10-16
Pianalto, Bernard
Coating processes
With post-treatment of coating or coating material
Solid treating member or material contacts coating
427371, 427428, B05D 312
Patent
active
049633970
ABSTRACT:
A paper coating system is characterized by an upstream dip roll applicator that applies an excess layer of liquid coating material onto a surface of a paper web, and an improved downstream doctor assembly for metering and leveling the coating on the web. The doctor assembly includes a doctor blade having a tip extended against and across the web and a shear plate, upstream of the blade, having a surfaces extending across and defining a gap with the web. An elongate chamber defined between the shear plate and blade extends across the web, and excess coating removed from the web by the blade flows into the chamber. Coating is drained from and uniformly along a lower end of the chamber at a rate to maintain an eddy current pool of coating in an upper end of the chamber immediately upstream of the blade/web nip, but to prevent formation of a liquid seal in the gap. The eddy current pool of coating rewets the excess coating on the web just prior to the blade to level and smooth streaky film split patterns that occur from dip roll application, so the blade doctors the coating very uniformly and a very uniform coating is on the finished paper sheet. To further improve uniformity, the shear plate is adjusted so that the gap is sufficiently small to prevent any outflowing coating from spattering onto the incoming web, yet large enough to prevent formation of a liquid seal in the gap.
REFERENCES:
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patent: 3302610 (1967-02-01), Mahoney
patent: 3486482 (1969-12-01), Hunger
patent: 3518964 (1970-07-01), Nagler
patent: 4310593 (1982-01-01), Gross
patent: 4396648 (1983-08-01), Holt et al.
patent: 4452833 (1984-06-01), Holt
Mason Lucien L.
Mayer Michael A.
Olson Leonard C.
Riemer Keith H.
Consolidated Papers Inc.
Pianalto Bernard
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