Hydrostatic shear inducing short dwell coater

Details Hydrostatic shear inducing short dwell coater Hydrostatic shear inducing short dwell coater

1995-05-17

1997-03-18

Edwards, Laura

Coating apparatus

Immersion or work-confined pool type

Work-confined pool

118413, 118419, B05C 500

Patent

active

056118600

ABSTRACT:
A coater head has a housing which defines a coating pond supplied with coating under pressure. A plurality of bars extend within the coating pond in the cross-machine direction, and are spaced parallel to one another in the machine direction. A paper web is engaged against a backing roll, and travels through the coating pond past a metering blade which applies coating from the pond to the web. The bars induce a turbulent flow which shears bubbles of air entrained in the coating pond, thereby reducing the bubble diameters and air-induced imperfections in the coating. Greater machine speed, which tends to entrain more air, induces greater shear at the bars which causes bubble size to be more greatly reduced.

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Andy Harrison, "New Coating Technologies Combine High Speeds with Higher Quality", pp. 60-64, Pulp & Paper May 1994.

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