Coating Thickness and Distribution Control Wiping Nozzle with Excellent Pressure Uniformity
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United States of America Patent
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Issued Date -
Jan 29, 2015
app pub date -
Feb 13, 2013
filing date -
Feb 21, 2012
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Abandoned
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Abstract
The present invention relates to a device for controlling the thickness of a coating made of a liquid film on a moving strip (3), comprising a nozzle (1) fed with a pressurized fluid (6) in a chamber (2) of the nozzle, said chamber (2) being terminated by nozzle lips (11) making an elongated discharge opening (12) for discharging the pressurized fluid onto the moving strip (3), said chamber (2) comprising also a perforated baffle plate (8) obstructing a cross-section L×h of the chamber (2) in the fluid flow, the perforated baffle plate (8) having a number of holes (13) so that the total surface of said holes (13) is higher than 90% of said cross-section and having a thickness Th higher than 3 times the individual diameter of any of said holes (13) and higher than 3 mm, characterised in that the perforated baffle plate (8) has a honeycomb geometry, i.e. a geometry having cells (13) with hexagonal section.
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