Magnetic dispersion coating method having high shear regions

Details Magnetic dispersion coating method having high shear regions Magnetic dispersion coating method having high shear regions

1993-07-29

1995-10-10

Housel, James C.

Coating processes

Magnetic base or coating

Magnetic coating

427356, 427358, 118410, B05D 312

Patent

active

054569443

ABSTRACT:
A method is disclosed for coating magnetic dispersion coatings on a continuously moving web substrate wherein regions of high shear are provided both before and after a magnetic dispersion application region. The coating apparatus comprises a die unit having a magnetic dispersion inlet and outlet, a concave lip extending arcuately from the outlet of the die unit, and a cylindrical backing roller adjacent the die unit, the die unit having an internal region of high shear, the concave lip and the cylindrical backing roller sharing a substantially common axis and forming a region of high shear in the form of a narrow gap. A coat hanger distribution chamber or cavity is also provided within the die unit between the magnetic dispersion inlet and the magnetic dispersion outlet. To even out pressure differences, a healing slot or cavity and/or a rotating bar within a cylindrical distribution chamber may be provided downstream of the coat hanger distribution chamber.

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