Method for producing a non-uniform coating on a substrate
Assignee3M Innovative Properties Company
InventorGary W. Maier
Life of this patent
Estimating the term…
Abstract
A roll coater can be modified by the addition of one or more needle tubes that supply coating fluid to the roll coater in discrete locations across the face of the coating roll. The needle tubes supply a localized band of coating material onto the coating roll superimposed over the uniform coating layer already present on the surface of the coating roll from an upstream coating pond creating a stripe pattern over the uniform coating layer. By varying the relative speeds of the coating rolls in the coater, the width of the stripe can also be adjusted.
Claims9
A method of coating a substrate with a coating apparatus, the method comprising:
- applying a first coating uniformly onto the face of a coating roll;
- applying a second coating in one or more discrete stripes over the first coating;
- and
- transferring the first and second coatings onto the substrate,
- wherein the coating apparatus comprises a five roll coater including the coating roll, a W3 roll, a W2 roll, a W1 roll and a W00 roll, the substrate wrapping at least a portion of the W3 roll and entering the five roll coater at an infeed nip between the W3 roll and the W2 roll, the W1 roll nipped with the W2 roll, the coating roll nipped with the W1 roll, and the W00 roll nipped with the coating roll.
Dependencies are inferred from the claim text.