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US 2013/0230653 A1Published application
Use of a transport coating to apply a thin coated layer
Assignee3M Innovative Properties Company
InventorsWilliam R. Dudley, William Blake Kolb
Life of this patent
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Abstract
It has now been determined that a first coating layer may be applied to a substrate by a first coating die in a much thinner layer than its rheological properties and/or surface properties would normally allow. This is accomplished by using a second coating fluid dispensed from a second coating die acting as a “dynamic liquid squeegee” to transport, spread, even, or meter the first coating layer on the substrate by varying a gap between the second coating die and the substrate.
Claims21
A method of coating a substrate comprising:
- providing a first coating die having a first slot width;
- providing a second coating die having a second slot width;
- applying a first coating, fluid from the first coating die onto a substrate forming a first coating layer;
- applying a viscoelastic second coating fluid from the second coating die over the first coating layer on the substrate forming a second coating layer;
- and
- varying a gap between the second coating die and the substrate to increase the width and reduce the thickness of the first coating layer on the substrate.
3 more elements
(canceled)
Dependencies are inferred from the claim text.