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US 4,934,310 AGranted
Coating apparatus for coating moving sheet
AssigneeJ.M. Voith GmbH
InventorsAlbert Wohrle, Franz Krautzberger
Life of this patent
Estimating the term…
Abstract
Coating apparatus is provided for use in coating a sheet of goods which is carried on a counter-roller. The coating apparatus includes a coating zone which is formed along the sheet to be coated. At least one deflector is provided in the coating zone for deflecting the return flow of coating material deflected at the coating blade to a divergence angle of less than 90 degrees relative to the emerging flow of fresh coating material from the outlet port of the chamber containing the coating material. In general, angle of divergence between the two opposing flows of coating material is less than 60 degrees. In this manner, the amount of agitation and turbulence in the flow of material is minimized.
Claims12
An apparatus for applying a coating material to a moving sheet, said apparatus including:
- (a) a chamber for retaining said coating material and having an anterior wall;
- (b) an outlet port connecting said chamber to a coating zone and providing a flow path for said coating material from said chamber to said coating zone;
- (c) a coating blade for applying a main portion of said coating material on said sheet and for deflecting an excess portion of the main portion of said coating material from said sheet towards said chamber as said sheet moves adjacent said coating blade;
- and
- (d) a guide hull located between said coating blade and said outlet port, said guide hull including a first deflector surface and a second deflector surface, said first deflector surface positioned between said outlet port and said coating blade and having a substantially arcuate shape, said first deflector surface for deflecting in said coating zone the excess portion of said coating material towards the main portion of said coating material to merge the excess portion back with the main portion of said coating material so that the excess portion maybe reapplied to the moving web, wherein an angle is formed where the main and excess portions of said coating material merge, said angle being at a maximum of 90 degrees, said second deflector surface for deflecting the emerging flow of the main portion of said coating material from said outlet port into said coating zone,
- wherein said anterior wall, said outlet port, said guide hull, and said doctor blade define said coating zone, said coating zone having a minimum amount of air introduced therein as the main portion of said coating material is applied to said sheet.
3 more elements
An apparatus for applying a coating material to a moving sheet, said apparatus including:
- (a) a chamber for retaining said coating material and having an anterior wall;
- (b) an outlet port connecting said chamber to a coating zone and providing a flow path for said coating material;
- (c) a baffle extending from said chamber through said outlet port into said coating zone for separating said outlet port into a first channel and a second channel, said first channel transmits a main portion of said coating material from said chamber to said coating zone, and said second chamber transmits an excess portion of the main portion of said coating material from said coating zone to said chamber;
- (d) a first guide hull located in said chamber and including a deflector surface for deflecting the excess portion of said coating material towards the main portion of said coating material in said chamber to merge the excess and main portions, wherein an angle is formed where the main and excess portions merge, said angle being at a maximum of 90 degrees;
- (e) a coating blade for applying the main portion of said coating material received from said first channel on said sheet and for deflecting the excess portion of said coating material from said sheet towards said second channel;
- (f) a second guide hull located between said coating blade and said second channel for preventing turbulence in a portion of said coating zone between said coating blade and said second channel,
- wherein said anterior wall, said outlet port, said second guide hull, said coating blade and said sheet define said coating zone, said coating blade having a minimum amount of air introduced therein as the main portion of said coating material is applied to said sheet.
4 more elements
An apparatus for applying a coating material to a moving sheet, said apparatus including:
- (a) a chamber for retaining said coating material and having an anterior wall;
- (b) an outlet port connecting said chamber to a coating zone and providing a flow path for said coating material;
- (c) a baffle extending from said chamber through said outlet port into said coating zone for separating said outlet port into a first channel and a second channel, said first channel transmits a main portion of said coating material from said chamber to said coating zone, and said second chamber transmits an excess portion of the main portion of said coating material from said coating zone to said chamber;
- (d) a first guide hull located in said chamber and including a deflector surface for deflecting the excess portion of said coating material towards the main portion of said coating material in said chamber to merge the excess and main portions, wherein an angle is formed where the main and excess portions merge, said angle being at a maximum of 90 degrees;
- and
- (e) a coating blade for applying the main portion of said coating material received from said first channel on said sheet and for deflecting the excess portion of said coating material from said sheet towards said second channel,
- wherein said anterior wall, said outlet port, said coating blade and said sheet define said coating zone, said coating blade having a minimum amount of air introduced therein as the main portion of said coating material is applied to said sheet.
4 more elements
Dependencies are inferred from the claim text.