Appeal No. 1998-1053
Application No. 07/974,832
each other.
CLAIM 24
A method of controlling a jet of foamed furnish leaving a
pressurized headbox of a paper or a tissue making machine
comprising the steps of:
feeding foamed furnish to a pressurized headbox to form a
jet of said furnish;
measuring parameters determinative of the density and
pressure of the foamed furnish;
estimating current velocity of the jet using the
measurements determinative of density and pressure but using
neither dierct measurement of volume flow rate nor direct
measurement of flow velocity of the jet; and
using said measured parameters to control said feeding
step.
CLAIM 26
A method of controlling a jet of foamed furnish leaving a
pressurized hydraulic headbox of a paper or a tissue making
mahcine comprising the steps of:
feeding foamed furnish through a positive displacement
pump to a pressurized hydraulic headbox to form a jet of said
furnish;
measuring parameters directly determinative of density
A-5
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