Method and device in headbox of paper, board or pulp drying mach

Details Method and device in headbox of paper, board or pulp drying mach Method and device in headbox of paper, board or pulp drying mach

1990-12-26

1992-01-21

Hastings, Karen M.

Paper making and fiber liberation

Processes and products

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

162337, 162343, D21F 106

Patent

active

050825305

ABSTRACT:
The flow ratio of a paper machine headbox is adjusted by arranging such a by-pass out from the slice chamber that the flow conditions, such as the speeds and turbulences in all parts of the headbox remain unchanged regardless of the adjustment. The adjustment is carried out by opening the slice chamber wall or by using a separate discharging device positioned inside the slice chamber.

REFERENCES:
patent: 3516905 (1970-06-01), Dennis et al.
patent: 3802960 (1974-04-01), Spengos et al.
patent: 3837999 (1974-09-01), Chung
patent: 4133715 (1979-01-01), Hergert
patent: 4162189 (1979-07-01), Kirjavainen
patent: 4285767 (1981-08-01), Page
patent: 4406741 (1983-09-01), Kirjarainen
patent: 4888094 (1989-12-01), Weisshuhn

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