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US 4,358,481 AGranted
Method and apparatus for coating both sides of a moving web
AssigneeInventing S.A.
InventorHans I. Wallsten
Life of this patent
Estimating the term…
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AssigneeInventing S.A.
InventorHans I. Wallsten
Estimating the term…
A method and apparatus for coating both sides of a moving web, such as a paper web, with the same coating material on both sides by feeding the web downwardly between a rotating support roller and a coating blade directed against said roller. One side of the web is partially wrapped around said roller and a first excess of coating material intended for the web side facing said roller is applied to the roller before or at the point of contact between said web and the roller. A second excess of coating material is applied to the other side of the web by feeding the web through a dam of coating material arranged below said contact point--in the moving direction of the web--said dam being formed substantially between said coating blade and holder and the said other side of the web. The excess coating material is laterally expressed in said dam beneath the top level thereof.
A method of coating both sides of a moving paper web by feeding the web downwardly through coating material contained in a dam comprising a support roller rotating in the same direction as the web and a cooperating blade directed towards the roller and forming with the latter a nip through which the web passes, one side of the web being partially wrapped around the roller beginning at a location above the surface of the coating material in the dam, characterized in that an excess of coating material is introduced between the roller and said one side of the web at about the location where the web begins to wrap around the roller such that on passage of the web through said nip the excess coating material thus introduced causes a portion of the web to bulge outwardly from the roller in the dam and below the surface of the coating material contained therein and the excess of coating material to be discharged laterally into the dam at locations below the surface of the coating material contained therein.
An apparatus for coating both sides of a web with coating material comprising a rotatable roller and an angularly disposed coating blade disposed in proximity to the surface of the roller to form therewith a dam for containing coating material and a nip at the lower end of the dam, means for running a web to be coated through said dam and nip with one side partially wrapped around said roller beginning at a location above the surface of the coating material in the dam, and means for introducing an excess of coating material between said roller and the adjacent side of the web at about the location where the web begins to wrap around said roller.
Dependencies are inferred from the claim text.