Increase edge stability and profit from uniform paper quality
Voith offers several components for efficient edge control on wires in top formers and Fourdrinier formers. For each application, a well-proven solution is available to improve machine runability and basis weight cross profile quality.
Save fibers and increase edge stability
The unique edge trim concept EdgeExpert defines the web edge in the stock jet as it exits from the headbox, resulting in fiber savings and increased edge stability.
Another feature is the adjustability in cross direction, which can be varied during ongoing production without any problem. This makes it easy to limit the headbox width and offers decisive advantages especially when producing different paper grades.
EdgeExpert can be quickly and easily mounted on both headbox sides during a regular shutdown. Furthermore, for service purposes, the entire unit can be pivoted upward to facilitate a comfortable fabric change, for example. EdgeExpert can be mounted on nearly all modern headboxes.
Edge control for optimal paper web edge
EdgeMaster is a variably adjustable extension of the headbox format plate. In the Fourdrinier wire and the hybrid former, it provides for uniform distribution of the stock suspension up to the edge.
By setting the position of the EdgeMaster in machine direction, it can be optimally adapted to the shape of the flow. Positioning screws allow precise lifting, lowering and pivoting. Water flushing prevents the suspension from flowing under the edge control device. In addition, spray water nozzles continuously moisten the surfaces in contact with the stock, enabling trouble-free production.
The EdgeMaster is retrofitted with an adapter plate extension to the existing headbox or by supplying a new format plate.
EdgeMaster is used at headboxes for Fourdrinier wire and hybrid former paper machines. These devices are frequently combined with wire edge lifters (EdgeCurlers).
Clean paper edge and wire edge at the Fourdrinier wire
Using the EdgeCurler wire edge lifter prevents the stock suspension from bleeding at the wire. The result is a clean paper edge and wire edge.
The EdgeCurler’s rugged, ceramic, contoured material prevents wire abrasion and ensures a long service life. To prevent the stock suspension from bleeding at the paper web edge on the Fourdrinier wire, an EdgeMaster or EdgeDeckle is combined with the EdgeCurler. Thanks to the easy adjustment of the wire edge lifter, the profile can be very easily adjusted manually, depending on the requirements. In addition, there is no impediment when changing the wire.
EdgeCurler is used at the Fourdrinier wire and prevents bleeding of the stock suspension at the paper web edge.
Uniform paper quality in the edge area
The EdgeDeckle is used to control the edge on Fourdrinier wires with large lip openings. It prevents the stock suspension from bleeding at the sides and provides for cleanliness in the headbox.
The EdgeDeckle prevents the stock suspension from bleeding at the Fourdrinier wire edge by means of a sealing strip. The optimal distance between edge control and wire is set with simple adjustment mechanisms. The remaining gap between sealing strip and wire is sealed from the outside with a spray tube. Setting the sealing strips prevents stock ripples from forming. Mechanical adjustment of the format width can be done even while the machine is running. In order to prevent build-up of fibers on the EdgeDeckle, all surfaces are wetted with a film of water.
The EdgeDeckle is used at Fourdrinier wires with large lip openings. The edge control can be easily retrofitted on any headbox.
Saves fresh fibers and keeps the wire edges clean
EdgeCleaner cleans the edges of Fourdrinier or top wires with adjustable fan-type nozzles, thereby reducing wire edge contamination and increasing wire running time.
Fibers and fillers carried along on the wire edge are sprayed off by the EdgeCleaner nozzles and collected in the whitewater pan. Since fibers of different plies are not mixed with one another, returning the raw materials to the short cycle saves valuable fresh fibers. All settings of the fan-type nozzles are fixed with adjusting screws. When changing the wire, EdgeCleaner can be pivoted away via a pivot point so as not to interfere with the changing of the wire. The fan-type nozzles and return funnel are kept moist by spray nozzles to prevent fiber build-up.
EdgeCleaner is used in Fourdrinier or top wires for cleaning the wire edges.
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