The wet suction box is a welded structure made of corrosion-resistant steel. It is mainly manufactured with a removable hydraulic lock, but as an option it is possible to manufacture with a built-in hydraulic lock. The box is attached to the beams by means of columns that allow it to adjust the height of the box and reduce the coating wear of the foils.
The box is equipped with 5 – 7 plates, each 65 mm wide. The angle of inclination of the foils to the wire ranges from 2 ° to 3 °. The foils can be made of polyethylene or ceramic. They are attached to the box using T-rails. The vacuum in the box is pumped by a fan. The vacuum volume usually ranges from 0 to 4 kPa. It can be adjusted using a suction valve. The width of the suction area is adjusted with movable end plates.
They are made for paper machines with reel widths from 1680 to 4200 mm.