Method and apparatus for coating both sides of a moving web
AssigneeInventing S.A.
InventorHans Ivar Wallsten
Life of this patent
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Abstract
A method and apparatus for coating both faces of a moving web, such as a paper web, in which the web is fed longitudinally at a speed in excess of 300 meters per minute, between a rotating support roller and a blade, the blade having a bevel at the point of contact with the web. Coating material is fed into the nip between the roller and the web to coat the paper web on both faces. The angle which the blade forms with is chosen to be not greater than 20.degree. and the bevel width, as measured in the direction of movement of the web, is at most 0.15 centimeters. Preferably the blade is urged against the web with a force not exceeding 0.20 kgf per centimeter width of web.
Claims10
A method of coating both faces of a moving web, such as a paper web, comprising feeding the web longitudinally at a speed in excess of 300 meters per minute between a moving support member and a blade, the blade and the support member forming a nip, feeding coating material into the nip to produce a dam of coating material whereby the web is coated on both faces, controlling the angle of the blade so that it extends at an angle less than 20.degree. to the web and choosing the bevel width, measured in the direction of movement to the web, to be at most 0.15 cm, said blade being urged against the web with a force not exceeding 2 kgf per cm width of web.
In an apparatus for coating both faces of a moving web, such as a paper web, moving at a speed in excess of 300 meters per minute, in which the web is fed between a moving support and a blade forming with the moving support a nip, the blade being thin and flexible and having a bevel at the point of contact with the web, in which coating material is supplied to the nip to coat both faces of the web, the improvement consisting in that the bevel width, as measured in the direction of movement of the web, is at most 0.15 cm.
Dependencies are inferred from the claim text.