Appeal No. 1998-1053
Application No. 07/974,832
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 a current velocity of the jet using the
measurements deteminative of density and pressure and using
neither direct measurement of flow volume rate nor direct
measurement of flow velocity of the jet;
providing a target velocity of the jet;
comparing the estimated and target jet velocities to
derive a control signal; and
utilizing the control signal to control the feeding step
to vary the estimated jet velocity to the target velocity.
CLAIM 10
A method of regulating the velocity of 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 cause
a jet of said furnish to leave the headbox;
measuring parameters determinative of the density and
pressure of the foamed furnish fed to the headbox and the
pressure of the foamed furnish in the headbox to derive
respective density and pressure measurements;
A-3
Page: Previous 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Next
Last modified: November 3, 2007