Method for improving the uniformity of a wet coating on a substrate using at least two wire-wound rods
Assignee3M Innovative Properties Company
InventorWilliam K. Leonard
Life of this patent
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Abstract
Continuous void-free uniform coatings are formed on substrates by repeatedly contacting the substrate at a first position with wetted surface portions of at least two rotating wire-wound coating rods and re-contacting the substrate with such wetted surface portions at a different position or positions on the substrate. The coating is repeatedly picked up from and placed onto the substrate and made more uniform. Extremely uniform and extremely thin coatings can be quickly and easily obtained using low cost equipment.
Claims28
A method for improving the uniformity of a wet coating on a substrate having a direction of motion comprising:
- applying to the substrate a wet coating;
- contacting the applied coating at a first position with wetted surface portions of at least two rotating wire-wound pick-and-place rods;
- and
- re-contacting the coating with such wetted surface portions at positions on the substrate that are different from the first position and not periodically related to one another with respect to their distance from the first position;
- whereby the coating caliper uniformity is improved in the direction of motion.
A method for improving the uniformity of a wet coating on a substrate comprising contacting the coating at a first position with wetted surface portions of at least two rotating wire-wound coating rods and re-contacting the coating with such wetted surface portions at a, different position or positions on the substrate and further comprising operating a coating rod at a fixed or variable surface speed differential relative to the substrate, wherein the surface speed differential is varied sinusoidally.
Dependencies are inferred from the claim text.