Edge seal assembly for paper coating apparatus
AssigneeConsolidated Papers, Inc.
InventorWayne A. Damrau
Life of this patent
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Abstract
An improved edge seal assembly for an applicator for applying a coating liquid to a moving web of paper, wherein the applicator is of the type having a chamber for receiving the coating liquid and an elongate opening thereto for directing the liquid onto the web, the opening being formed between a front wall of the chamber and a doctor blade extending from the rear side of the opening to against the web, is characterized by a seal element sealed with the front wall and doctor blade in an end space therebetween, and a deckle beneath the seal element for closing off a selected portion of the side end of the opening. The seal element and the deckle are slidingly interconnected and can be independently adjusted laterally with respect to the opening.
Claims13
In an applicator for applying a coating liquid to a moving web of paper carried through an application zone, wherein the applicator is of the type comprising a body portion having a chamber therein with an elongate metering slot therefrom defined between upper ends of front and rear walls of said body portion and extending substantially transversely across the web;
- a doctor blade extending from said rear wall substantially transversely across and against the web;
- an orifice plate extending from said front wall substantially transversely across and toward but spaced from the web to define a gap therewith;
- and means for introducing coating liquid under pressure into said chamber and through said metering slot into an application zone for application onto the web, an improved sealing means at each side end of said metering slot and application zone, said sealing means, doctor blade and orifice plate defining said application zone therebetween and above said metering slot, each said sealing means comprising edge seal means sealed along side surfaces thereof with said doctor blade and orifice plate, sealed along a lower surface thereof with said upper ends of said front and rear walls, extending at an upper surface thereof toward the web for substantially sealing therewith and adjustably mounted for movement into and out of said application zone side end, and an elongate deckle within said metering slot, separate from and movable with respect to said edge seal means, adjustably extendable along and within said metering slot below said edge seal means a selected distance with respect to and inwardly of said edge seal means and substantially sealed with said body portion front and rear walls within and on opposite sides of said metering slot, said deckle closing said metering slot for said selected distance inwardly of said side end thereof to control the length of said metering slot so that said metering slot is open only inwardly of said edge seal means, whereby coating liquid is directed through said metering slot into said application zone only inwardly of said edge seal means and is not directly impinged onto said edge seal means as it exits said metering slot so that leakage of coating liquid past said edge seal means is reduced.
In combination with an applicator for applying coating liquid to a moving web of paper, wherein the applicator is of the type having a body portion defining a chamber therein with an elongate metering slot therefrom defined between upper ends of front and rear walls of said body portion and positionable generally below, adjacent to and transversely across the web, said chamber for receiving coating liquid and directing the same generally upwardly through said metering slot and onto the web, and a doctor blade extending from said rear wall against and substantially transversely across the web, an elongate deckle extended within said metering slot and along the entirety of the length thereof, said deckle completely sealing said metering slot so that said applicator may be used solely to doctor coating liquid applied on the web upstream of said applicator, said deckle then blocking said metering slot to prevent coating liquid removed by said doctor blade from flowing into and contaminating said metering slot and chamber.
Dependencies are inferred from the claim text.