Techpap SAS

Automated Dynamic Handsheet Former

The uniqueness of the ADF resides in its handsheet formation principle which is completely different from classic handsheet formers. In fact, the ADF uses a process very similar to industrial PM sheet production. The sheet is formed by the projection of pulp on a wire positioned on the ID of a rotating cylindrical jar. The wire is completely submerged in a water wall. The pulp projection is accomplished using an injector nozzle fixed on a delivery tube sweeping vertically up and down inside the rotating cylindrical jar. The final basis weight of the sheet depends on the consistency of the pulp, the number of nozzle sweeps and the pulp flow.

A scoop system bails out the water wall after the sheet is formed and the water remaining in the sheet is drained by centrifugal force. After the sheet is drained it can be removed along with the wire from the cylindrical jar for pressing and drying.