HIGH VACUUM ZONE SUCTION BOXES  

- BIVAC
- TRIVAC
- QUADRIVAC

With the increase of the dry level, in the sheet, it is necessary to apply a progressively higher vacuum level to overcome the resistance at the drying. From the operational point of view, there is a significant difference between the installation of a few single boxes and installation of a single box with multi vacuum zone. In a system with single boxes, the pressure between two boxes returns to atmospheric pressure. The vacuum in the next box must be restored with a reduction in drainage efficiency. In a system with multi-vacuum boxes, there is no discontinuity in the vacuum increment, which increases the drainage efficiency.