Patent DE-102006011541-A1 (DE)
Title: Curtain applicator for application of a liquid to aqueous pigment suspension on a running paper, cardboard or other fibrous material web during their production and/or processing, comprises a slot nozzle applicator
Inventor: STELLNER BERND-UWE
IPC: D21H23/48
Filed: 2006-03-14
Abstract: The curtain applicator for application of a liquid to aqueous pigment suspension on a running paper, cardboard or other fibrous material web (2) during their production and/or processing, comprises a slot nozzle applicator (4) and a collecting- and discharging mechanism (12). The slot nozzle applicator is arranged above the fibrous material web, corresponds to the width of the fibrous material web and delivers the application medium as a freely falling curtain (5), which moves under the force of gravity, on an impact line (7) directly to the running fibrous material web. The curtain applicator for application of a liquid to aqueous pigment suspension on a running paper, cardboard or other fibrous material web (2) during their production and/or processing, comprises a slot nozzle applicator (4) and a collecting- and discharging mechanism (12). The slot nozzle applicator is arranged above the fibrous material web, corresponds to the width of the fibrous material web and delivers the application medium as a freely falling curtain (5), which moves under the force of gravity, on an impact line (7) directly to the running fibrous material web. A line coat is formed on the side of the web facing the slot nozzle. The curtain moves under the force of gravity. The mechanism is arranged for the production a coating-free or coating-reduced edge of the web or for the adjustment of the width of the curtain application medium underneath the slot nozzle applicator and still before the impact line, collects and discharge a part of the curtain and delivers an aqueous curtain replacing the collected part of the curtain application medium in the boundary region and/or at the edge of the web of the fibrous material web. The mechanism exhibits a rounded curtain-separating edge pointing towards the slot nozzle applicator, an inclined collecting and discharging surface and a slot nozzle (13), which is arranged opposite to and/or below the collecting and discharging surface, for the delivery of the aqueous curtain substitute, and a partition with a downwardly-pointing tip and/or sharp-tipped edge. The mechanism is hollow-shaped and is subjected to cooling water, which is used at the same time for the aqueous curtain substitute to be delivered by the slot nozzle. The falling velocity of the aqueous curtain substitute is higher than the curtain application medium. The clearance width of the slot nozzle for the curtain substitute is adjusted to be narrower than the slot nozzle for the curtain application medium. The slot nozzle is subjected to pure water or water with starch or dye for the formation of the spare curtain. The separating edge is arranged at a distance of 0-50 mm from the application medium slot nozzle. The pointed edge and/or a water outline edge are arranged at a distance of 0-200 mm from the web side of the fibrous material web. The slot nozzle is connected by screw connections with the mechanism for the formation of the curtain substitute or forms a single-piece component with it. The mechanism is inserted into or removed from the running curtain application medium, is positionable transverse to the direction of movement of the fibrous material web and is movable manually or driven by motor.