High speed paper coaters

Details High speed paper coaters High speed paper coaters

B - Operations, Transporting

05

C

117/105, 32/44

B05C 11/04 (2006.01) D21H 23/36 (2006.01)

Patent

CA 1330740

HIGH SPEED PAPER CRATERS Abstract of the Disclosure A coater for applying liquid coating material onto paper web carried across an upstream dip roll applicator that applies an excess layer of coating onto the surface of the web, is characterized by 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 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 react 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.

594506

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