Device and method for stabilizing a paper web at a time before the web is cut
AssigneeVoith Sulzer Papiermaschinen GmbH
InventorsBernd Kaufmann, Herbert Illenberger
Life of this patent
Estimating the term…
Abstract
A device is provided for stabilizing a paper web in an unwinding and splicing station. The splicing station includes a primary paper roll and a secondary paper roll. A suction trough extends across a width of the paper web and includes a suction zone adjacent the paper web. The paper web unwinds from the secondary paper roll and passes the suction trough. The suction zone extends substantially across the width of the paper web and is configured to effect a substantially uniform vacuum in its area, wherein the unwinding paper web runs evenly over the suction zone area.
Claims23
A device for stabilizing a paper web in a paper machine, said device comprising:
- a continuous unwinding and flying splicing station, the splicing station including a primary paper roll, a secondary paper roll and a cut-off device, said secondary paper roll is adapted to have the paper web unwinding therefrom, said splicing station defining a splicing location, said cut-off device positioned between said secondary paper roll and said splicing location;
- and
- a suction trough disposed between said secondary paper roll and said splicing location, said suction trough extending across a width of the paper web, said suction trough including a pair of cylindrical pipes disposed side-by-side and non-rotatably connected to each other, said cylindrical pipes defining a suction zone adjacent the paper web, the paper web is adapted to travel past said suction trough to said splicing location, said suction zone extending substantially across said width of the paper web and being configured to effect a substantially uniform vacuum in a suction zone area, wherein the paper web runs evenly over said suction zone area.
A method of performing a flying splice in a paper machine, said method comprising the steps of:
- providing a secondary paper roll having a secondary paper web;
- providing a primary paper roll having a primary paper web;
- providing a splicing roll at a splicing location associated with said primary paper roll;
- providing a cut-off device between said secondary paper roll and said splicing location;
- providing a suction trough between said secondary paper roll and said splicing location, said suction trough including a pair of cylindrical pipes disposed side-by-side and non-rotatably connected to each other to define a suction zone adjacent the secondary paper web;
- rotating and continuously unwinding said secondary paper web from said secondary paper roll at a web travel speed which creates a boundary air layer between said secondary paper web and said suction trough, said secondary paper web traveling past said splicing location;
- rotationally accelerating said primary paper roll until a peripheral speed of said primary paper roll is substantially equal to said web travel speed of said secondary paper web;
- pulling said secondary paper web against said suction trough by exerting a vacuum upon said secondary paper web with said suction trough;
- moving said splicing roll against said secondary paper web and said primary paper roll at said splicing location after said accelerating and pulling steps;
- and
- cutting said secondary paper web with said cut-off device.
Dependencies are inferred from the claim text.