2.2.1 Process parameters The mechanical adjustment system in the headbox makes it possible to adjust the jet relative to the fabric, chest- and forming-roll. The following parameters are possible to adjust
Jet impingement: The percentage of the jet which strikes the forming roll. Jet angle: The angle between the fabric and jet Jet length: The distance between the headbox lip tip and the hit point of forming roll or fabric Nip distance: The span between the chest roll and forming roll
2.3 Material in headbox The steel material in the headbox is a duplex stainless steel that consists of a ferritic and austenitic zone that has high strength, good toughness and good corrosion resistance. The duplex stainless steel that is used is LDX 2101. (Outokumpu, 2014a)