Oy Wartsila Ab

Valmet Paper Machinery Inc.

Lannen Tehtaat Oy

Dan Eklund

Sivert Westergard

Kari Saarinen

Anders Lassus

Markku Grasten

Jukka Erkkila

Matti Ingman

Kauko Peltonen

In a device for alternatively one- or double-sided coating of a running paper web the final evening-out of the coating is made in a smoothing nip including a first roll and a counter member. The device includes means for leading the web from below upwards into the smoothing nip. At a considerable distance before the smoothing nip, there is a coating substance applicator including an applicator chamber, where the coating substance is brought into a substantially non-pressurized contact with the running web for adhering thereto and travelling therewith upwards to the smoothing nip. The web moves linearly from the applicator to the smoothing nip.

Coater for selectively coating a running web either on one side or on

A coater for coating a running paper or carboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall. Close to the web entrance wall the flow of coating substance in the coating chamber is divided into two branches, of which a first branch follows the web in its running direction towards the back wall and a second branch, which is considerably greater than the first branch, flows out from the coating chamber through a slot between the web entrance wall and the web.

Coater

A coater for coating a running paper or cardboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall. Close to the web entrance wall the flow of coating substance in the coating chamber is divided into two branches, of which a first branch follows the web in its running direction towards the back wall and a second branch, which is considerably greater than the first branch, flows out from the coating chamber through a slot between the web entrance wall and the web.

Apparatus for coating running webs

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.

Arrangement for web coating

A roll blade assembly for a paper coating machine, comprising a frame (5), a support mounted on the frame (5), a blade member (8) mounted on the support (3), a set of mounting accessories (1, 6, 7) for attaching the inner longitudinal end of the blade member (8) to the support (3), a bar unit (9) provided with a rotating metering bar (10) and, attached to the blade member (8), and a pneumatically inflatable loading bag (2) arranged to push the bar unit (9) outwards from the support (3) when the inflation pressure is raised. The blade member (8) is flexible, and the support (3), the bar unit (9), and the blade member (8) form a recess (4) compliant with the loading bag profile and extending in the lateral direction of the blade member (8) over at least 50 percent of the unobstructed blade width. The large inflated bag contact surface makes a more accurate control of the metering bar pressing force possible by directly contacting the blade member.

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Kauniainen, Finland

Dan Eklund