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US 4,880,672 AGranted
Method and apparatus for bladecoating of a moving web
AssigneeInventing S.A.
InventorTore Ericksson
Life of this patent
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AssigneeInventing S.A.
InventorTore Ericksson
Estimating the term…
The invention refers to a method and a device for varying the application amount of a coating agent at the blade coating of a moving material web (24,40,51), preferably a paper web, by corresponding control of the engagement pressure of the coating blade (20,43,50,68) against the web (24,40,51) which exhibits a coating agent surplus. The web is supported by a support, preferably a rotating support roller (25,41), and the blade is along one of its longitudinal sides clamped in a blade holder (21,44,49,69), moreover the blade is initially, with a certain force and thereby in an obtained arcuate shape, brought, with the opposite longitudinal side thereof, into engagement with the web, in a certain given angle between blade tip and web, and with a thereby defined engagement area. A control pressure is exerted onto the major side of the blade when the engagement pressure is to be changed, the attack point of the control pressure on the blade is displaced in the transverse direction of the blade, towards or away from the web. At the same time the size of the control pressure is adjusted. Said displacement and adjustment are done partly to provide the desired blade engagement pressure and partly to mainly maintain the angle between the blade tip and the web.
A method of varying the application amount of coating agent applied by bladecoating of a moving web, preferably a paper web, by control of engagement pressure of a coating blade against the web, the web supported by a rotating support roller, said blade clamped into a blade holder along one longitudinal edge, an opposite longitudinal edge of said blade being in engagement with the web and being in a substantially arcuate shape with predetermined angle defined between a tip of the blade and the web so as to define an area of engagement, comprising, displacing a control pressure acting on a major surface of the blade in a transverse direction of the blade towards and away from the web and controlling the size of the control pressure to the blade position to provide a predetermined blade engagement pressure against the web by said displacing of the control pressure and to substantially constantly maintain the angle between the web and the blade tip.
A device for changing an amount of coating agent from a surplus of the coating agent applied to a moving web by blade coating by control of an engagement pressure of the coating blade against the web, the web being supported by a rotatable support roller, said blade being clamped in a blade holder along one longitudinal side of the blade, the opposite longitudinal side of said blade being initially forced into engagement with the web so that the blade tip has a predetermined angle with the web, means for displacing a pressure element acting on a major surface of the blade in a transverse direction of the blade towards and away from the web, and a control means for controlling selected displacement positions of the pressing element to exert a pressure and control the angle between the blade tip and the web substantially constant corresponding to different displacement positions of the pressing means.
Dependencies are inferred from the claim text.