High speed paper coaters

Details High speed paper coaters High speed paper coaters

1987-12-02

1989-08-22

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

118126, 118410, 118413, B05D 312

Patent

active

048595071

ABSTRACT:
A coater for applying liquid coating material onto a paper web carried across an upstream dip roll applicator that applies an excess layer of coating onto the surface of the web, is cahracterized by an improved downstream doctor assembly for metering and leveling the coating of the web. The doctor assembly includes a doctor blade having a top extended agianst and across the web, and a shear plate just upstream of the blade. The shear plate has a surface facing toward but spaced from the web and a ramp on the surface extending toward the web. As the coating layer on the web contacts the doctor blade, excess coating removed from the web by the blade bounces back off of the blade, flows across the shear plate surface and is deflected by the ramp against the web to rewet the excess coating layer on the web before it reaches the blade. The energy of the rewetting flow is sufficient to smooth and eliminate film split or streaking patterns that occur in excess coating applied with a dip roll applicator, so that there is a much more uniform coating on the resulting paper sheet.

REFERENCES:
patent: 4310573 (1982-01-01), Damrau
patent: 4712506 (1987-12-01), Rantanen et al.

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