High flexibility of use for all types of paper or board grades to be produced.
In order to meet the physico-mechanical characteristics of the sheet, the VACUALL is located on the Fourdrinier :
* either as a TOP-FORMER (VACUALL of type IV). The distance is between 8 m and 9 m from the headbox. * or as a FORMER (VACUALL of type V).The distance is between 1,5 m and 3 m from the headbox.
Better formation as far as the sheet look-through is concerned.
Controling sheet fiber orientation.
Better sheet symmetry or orientation. ·High distribution of the fines.
Better ash distribution.
Increase of the Fourdrinier drainage capability.
Increase of the sheet dryness at the Fourdrinier outlet.
Decrease of the vacuum power on the bottom Fourdrinier.
