Method and apparatus for coating a moving paper web

Details Method and apparatus for coating a moving paper web Method and apparatus for coating a moving paper web

1995-11-20

1997-10-07

Bareford, Katherine A.

Coating processes

Measuring, testing, or indicating

427172, 427356, 118672, 118 33, 118126, B05D 312, B05C 1104

Patent

active

056745516

ABSTRACT:
A method and apparatus for coating a moving paper or cardboard web, in which the moving web is brought to a first backing roll and coating mix is metered onto the web by means of a pre-doctoring blade in the form of a high-velocity laminar flow in front of the pre-doctoring blade. The applied coating mix is smoothed evenly onto the web with the pre-doctoring blade and the coated web is brought to a second backing roll, where the applied coating mix is smoothed using a doctor blade working on the web supported by the second backing roll. The tension of the web is measured upstream from the first backing roll and the rotational speed of the second backing roll is set so that the tension of the web is set at a desired value. The rotational speed of the first backing roll is set so that a speed difference between the first and the second backing roll compensates for elongation of the web caused by wetting between the first and second backing rolls.

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