Metso Paper Inc.

Maarit Tukiainen

Hannu Lepomäki

Jyrki Huovila

Hannu Karema

Markku Kellomäki

A headbox () of a paper machine or such includes a bypass manifold (J), from which the pulp is conducted by way of pipes (. . . ) of pipe rows in a set of pipes () and an intermediate chamber (E) into a turbulence generator (), or from the bypass manifold (J) directly into the turbulence generator and by way of the pipes (. . . ) of the turbulence generator's () pipe rows into a lip cone (K) and further out from the headbox on to a formation wire. The turbulence generator () of the headbox includes a fluidization element (), wherein fluidization is carried out in one stage only and in which structure as little disturbance as possible is then caused to the fluidised flow.

Headbox of paper machine or such

A method for fluidisation of a pulp flow in the headbox of a paper machine or such. The characteristics of the pulp flow are affected in the headbox's fluidiser () in one step only, whereby the height (h) of the step is at least equal to the average fibre length, and after the fluidiser () the biggest permissible step expression in the flow channel in direction z is smaller than the average fibre length.

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Säynätsalo, Finland

Maarit Tukiainen