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US 4,158,076 AGranted
Coating delivered as bubbles
AssigneeInventing S.A.
InventorHans I. Wallsten
Life of this patent
Estimating the term…
Abstract
In a method of treating a surface such as a paper web with a treating agent, the treating agent is foamed under pressure and delivered via a passsageway to an application zone so as to come into close proximity with the surface to be treated which may be moved continuously past the application zone. A constriction, upstream in the direction of foam flow, of the passageway causes a pressure drop in the body of the foam causing bubbles of the foam to burst adjacent the surface, being treated whereby the treating agent is applied to the surface.
Claims10
A method of treating a moving surface with a treating agent comprising the steps of:
- delivering the treating agent through a passage of a container and in the form of a foam of an application zone adjacent the surface to be treated;
- providing a region of reduced pressure and moving the foam between said moving surface and an extended surface of the container towards said region of reduced pressure, causing bubbles in the application zone and adjacent said surface to burst as they enter into the region of the pressure drop at a location upstream of the application zone, whereby said treating agent is applied to said moving surface;
- and
- allowing gas liberated from the burst bubbles to exit through an opening in the application zone.
1 more element
Dependencies are inferred from the claim text.