Coating apparatus – Solid member or material acting on coating after application – Running length work
Patent
1990-10-12
1991-12-31
Wityshyn, Michael
Coating apparatus
Solid member or material acting on coating after application
Running length work
118413, 118419, B05C 1104
Patent
active
050762001
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 surface 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:
patent: 3486482 (1969-12-01), Hunger
patent: 3518964 (1970-07-01), Nagler
patent: 4407227 (1983-10-01), Mauranen
patent: 4780336 (1988-10-01), Damrau
patent: 4903632 (1990-02-01), Sollinger
patent: 4934310 (1990-06-01), Wohrle et al.
Mason Lucien L.
Mayer Michael A.
Olson Leonard C.
Riemer Keith H.
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