Slide die coating method and apparatus with improved die lip
First Claim
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1. A method of die coating at least one coating fluid onto a surface comprising:
- sliding a first coating fluid along a slide surface that has a sharp edge, and an upstream land contacting the sharp edge and spaced further from the surface than the sharp edge to form a continuous coating bead between the sharp edge and the surface being coated; and
sliding the first coating fluid onto the surface without any coating fluid traveling between the sharp edge and the land, wherein the surface being coated has a shape, wherein the land has a shape which conforms to the shape of the surface being coated, and wherein the bead does not substantially move into a space between the land and the surface to be coated even when vacuum is applied and increased.
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Abstract
A slide die coating method and apparatus includes a die having an upstream bar with an upstream lip, a manifold bars a downstream bar with a downstream lip, a vacuum bar, and a slide surface. The upstream lip is formed as a land and the first manifold bar is formed as a sharp edge. The coating fluid exits the die from a passageway and slides along the slide surface to form a continuous coating bead between the manifold bar sharp edge, the upstream die lip, and the surface being coated. The shape of the land conforms to the shape of the surface being coated. The die can include multiple passageways for coating multiple layers.
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Citations
8 Claims
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1. A method of die coating at least one coating fluid onto a surface comprising:
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sliding a first coating fluid along a slide surface that has a sharp edge, and an upstream land contacting the sharp edge and spaced further from the surface than the sharp edge to form a continuous coating bead between the sharp edge and the surface being coated; and sliding the first coating fluid onto the surface without any coating fluid traveling between the sharp edge and the land, wherein the surface being coated has a shape, wherein the land has a shape which conforms to the shape of the surface being coated, and wherein the bead does not substantially move into a space between the land and the surface to be coated even when vacuum is applied and increased. - View Dependent Claims (2, 3)
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4. A coating apparatus for coating at least one coating fluid onto a surface comprising:
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a slide surface having a sharp edge and an upstream land contacting the sharp edge and spaced further from the surface than the sharp edge; and first means for causing a first coating fluid to slide along the slide surface to form a continuous coating bead between the sharp edge and the surface being coated for application onto the surface without any of the first coating fluid traveling between the sharp edge and the land, wherein the surface being coated has a shape and wherein the land has a shape which conforms to the shape of the surface being coated. - View Dependent Claims (5, 6)
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7. A coating apparatus for coating at least one coating fluid onto a surface comprising:
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a slide surface having a sharp edge and an upstream land contacting the sharp edge and spaced further from the surface than the sharp edge; and first means for causing a first coating fluid to slide along the slide surface to form a continuous coating bead between the sharp edge and the surface being coated for application onto the surface without any of the first coating fluid traveling between the sharp edge and the land, wherein the slide surface is at an angle A6 with a tangent plane of the web ranging from 30°
through 75°
. - View Dependent Claims (8)
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Specification