Hydraulic headbox with air attenuation chamber located under the

Details Hydraulic headbox with air attenuation chamber located under the Hydraulic headbox with air attenuation chamber located under the

1989-05-08

1990-05-08

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162336, 162340, 162343, D21F 102

Patent

active

049235699

ABSTRACT:
The invention relates to a headbox of a paper or board making machine, particularly a hydraulic headbox, which has an inlet header section (1) with a manifold tube section (2) and an equalizing chamber (3) in the stock suspension flow route, a turbulence generator section (4) following the equalizing chamber (3), after which a tapered slice section (8) is located, through which the stock suspension is discharged onto the wire. The headbox also has an attenuation chamber (6) for pressure variations, which defines one or several air spaces (7) under the flow channel of the stock suspension, the spaces being connected with the flow channel by way of a connecting channel (5). The air space or spaces (7) are preferably confined by subjacent frame structures including a bottom wall (16) and vertical walls (18) and walls (19) defining the flow channel from below.

REFERENCES:
patent: 2550552 (1951-04-01), Goodwillie
patent: 2782692 (1957-02-01), Boronow et al.
patent: 3598698 (1971-08-01), Goddard
patent: 4166759 (1979-09-01), Kirjavainen
patent: 4179332 (1979-12-01), Ilmoniemi et al.
patent: 4414062 (1983-11-01), Kirjavainen
patent: 4432835 (1984-02-01), Waris et al.

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