Headbox of a paper/board machine

Details Headbox of a paper/board machine Headbox of a paper/board machine

1995-06-01

1997-05-06

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

162258, 162259, D21F 106

Patent

active

056267223

ABSTRACT:
A headbox of a paper/board machine including a set of valves, each of which is arranged to distribute a flow to a different point in the direction of width of the headbox. Each valve is capable of regulating both the flow quantity of the flow departing from the valve and the consistency of the flow departing from the valve. Further, each valve includes an input line for the stock flow and an input line for a diluting flow, which is preferably a diluting-water line, and the flows are combined in the valve. The combined flow is passed into the headbox into connection with the stock flow present in the headbox coming from a stock inlet header to be mixed therewith. The headbox includes a turbulence generator arranged after and connected to the stock inlet header in the flow direction. The turbulence generator includes turbulence tubes which open into a slice duct, preferably a slice cone, from which the stock is passed onto a forming wire. The flows are passed from the valves into the turbulence tubes in the turbulence generator so that the overall combined flow is distributed into the turbulence tubes in the turbulence generator.

REFERENCES:
patent: 3791918 (1974-02-01), Koskimies et al.
patent: 4897158 (1990-01-01), Weisshuhn et al.
patent: 4909904 (1990-03-01), Kinzler
patent: 5030326 (1991-07-01), Nous
patent: 5196091 (1993-03-01), Hergert
patent: 5490905 (1996-02-01), Huovila et al.

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