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Abstract

An apparatus for coating a vertically travelling web comprises a vertical coating chamber defined by the web, a pair of side walls, a back wall spaced from the web, and a flexible blade applied against the web and forming a top closure of the coating chamber. There is a back-up member at the opposite side of the web forming a coating nip together with the flexible blade, through which nip the web passes. A slot at the bottom of the coating chamber forms a web entrance of the coating chamber. The width of the slot and the supply of coating substance to the coating chamber are so adapted to the speed of the web and to the viscosity of the coating substance, that only a small amount of coating substance flows downwardly through the slot during normal operation of the apparatus. The side walls of the coating chamber provide means for substantially closing the coating chamber. A flow regulating member may be arranged crosswise to the web and at a distance therefrom to form between itself and the web a duct converging in the travelling direction of the web. The duct has an average height perpendicularly to the web which is smaller than the thickness of the coating substance layer that would adhere to the travelling web in the absence of the flow regulating member.

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First Claim