Headbox for a paper machine with dilution feed lines before a tu

Details Headbox for a paper machine with dilution feed lines before a tu Headbox for a paper machine with dilution feed lines before a tu

1988-12-07

1990-03-20

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

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

162336, 162344, D21F 106

Patent

active

049099043

ABSTRACT:
A headbox features in the machine-wide suspension channel, following in the flow direction of the suspension, a tubular distributing grid, an equalization channel, a turbulence generator, and a nozzle. Connected to the suspension channel is a device for dispensation of diluting liquid into the suspension. The amount of diluting liquid is adjustable across the machine width in contingence on the position of the basis weight cross profile variation in the produced paper web. The diluting liquid is dispensed directly before a choking point of the turbulence generator, into the suspension channel, in order to thereby prevent hydraulic disturbances, specifically cross flows in the suspension flow in the nozzle.

REFERENCES:
patent: 2904461 (1959-09-01), Washburn et al.
patent: 3407114 (1968-10-01), Springuel
patent: 3547775 (1970-12-01), Bossen et al.
patent: 3725197 (1973-04-01), Dahl et al.
patent: 3970513 (1976-07-01), Lehtinen
patent: 4414062 (1983-11-01), Kirjavainen

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