Multiple layer coating method
AssigneeMinnesota Mining and Manufacturing Company
InventorWilliam K. Leonard
Life of this patent
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Abstract
A plurality of simultaneously applied coating fluids is coated on a substrate by moving the substrate along a path through a coating station. A plurality of flowing layers of coating fluid is formed in face-to-face contact with each other to form a composite layer. This composite layer flows at a speed that is sufficiently high to form a continuous flowing composite layer jet to the substrate surface for the coating width regardless of the direction of flow of the fluid jet.
Claims19
A method of coating a substrate with a plurality of layers of coating fluid comprising the steps of:
- moving the substrate along a path through a coating station;
- forming at least first and second flowing layers of coating fluid;
- flowing at least one of the layers from an orifice of a slot of a kinetic jet coater at a velocity that is sufficient to form a continuous, horizontally flowing orifice-exiting kinetic jet;
- placing the layers in face-to-face contact with each other to form a composite layer regardless of whether each layer is individually flowing at a velocity that is sufficient to form a continuous flowing fluid kinetic jet;
- flowing the composite layer at a velocity that is sufficient to cause the composite layer to form a continuous, horizontally flowing kinetic jet to the substrate for a coating width;
- and
- contacting the substrate with the flowing composite layer kinetic jet to deposit the coating fluids on the substrate in a plurality of distinct superposed layers of the coating fluids;
- wherein the moving the substrate along a path through a coating station step comprises spacing the substrate from the beginning of the fluid kinetic jet a distance greater than ten times the thickness of the composite layer applied to the substrate.
A method of coating a substrate with a plurality of layers of coating fluid comprising the steps of:
- moving the substrate along a path through a coating station;
- forming at least first and second flowing layers of coating fluid;
- flowing at least one of the layers from an orifice of a slot of a kinetic jet coater at a velocity that is sufficient to form a continuous, horizontally flowing orifice-exiting kinetic jet;
- placing the layers in face-to-face contact with each other to form a composite layer regardless of whether each layer is individually flowing at a velocity that is sufficient to form a continuous flowing fluid kinetic jet;
- flowing the composite layer at a velocity that is sufficient to cause the composite layer to form a continuous, horizontally flowing kinetic jet to the substrate for a coating width;
- and
- contacting the substrate with the flowing composite layer kinetic jet to deposit the coating fluids on the substrate in a plurality of distinct superposed layers of the coating fluids;
- and
- interrupting the coating process without stopping the substrate or ceasing the other steps by blocking the flow before it contacts the web.
A kinetic jet coater apparatus for coating a substrate with multiple layers of coating fluid comprising:
- a die having a first passageway communicating between a coating fluid source and a die exit;
- means for moving the substrate at a spaced distance from the die exit;
- means for flowing a first coating fluid from the die exit at a rate that is sufficiently high to cause the coating fluid to exit from the die exit and create a continuous horizontally flowing fluid kinetic jet bridging to the substrate for a coating width when the substrate is a distance greater than ten times the thickness of the composite laver applied to the substrate;
- means for flowing at least one second coating fluid layer in face-to-face contact with the coating fluid kinetic jet to form a composite layer kinetic jet bridging to the substrate for the coating width.
Dependencies are inferred from the claim text.