The task of the press section is to remove water, primarily through wet pressing. Wet pressing increases sheet dryness in order to ensure adequate paper machine drying capacity and to improve web runnability at the beginning of the dryer section. The press section also has a major impact on sheet surface properties such as roughness and absorption, and indirectly also on bulk.
Efficient nip dewatering is achieved by using a denser and also a little lighter than that used in Uhle box dewatering, such as TransMaster Open
By applying a SymBelt
shoe pressing we can increase the web dry content by 4 – 8 % percentage units compared to roll pressing.
Shoe press dewatering requires a belt with utmost dewatering capacity and durability while maintaining a stable run. The V groove of the patented Metso BlackBelt
has been tested and successfully used on several paper and board machines.
In shoe pressing it is important to ensure effective doctoring of the surface of the polyurethane belt. The effective BeltDoc
doctoring method ensures effective doctoring of the surface of the polyurethane belt.
BeltDoc increases water removal from the belt grooves. Thanks to this we can use felts that are designed for nip dewatering.