Back to results
US 7,479,789 B2Granted
Method and device for measuring the degree of fiber concentration
AssigneeDaprox AB
InventorBengt Åkerblom
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDaprox AB
InventorBengt Åkerblom
Estimating the term…
A method for measuring the degree of fiber concentration in a pulp in a machine, in particular a refiner for the manufacture of paper pulp, which machine includes a stator and an opposing rotor, which form a grinding gap for the pulp. The stator is provided with at least one sensor device, designed to interact with a rotor surface and including an impedance meter body with a sensor surface which impedance meter body is mounted in the stator in such a way that it can move axially. Measurements of the impedance between the rotor surface and the sensor surface are carried out during an axial movement of the impedance meter body and the measured impedance differences are utilized together with the size of the movement to determine the dielectric constant of the pulp, from which the degree of fiber concentration in the pulp is dervived.
Method for measuring the degree of fiber concentration in a pulp inside a machine, in particular a refiner for the manufacture of paper pulp, which machine comprises a stator and an opposing rotor, which form a grinding gap for the pulp, with the stator being provided with at least one sensor device, designed to interact with a rotor surface and comprising an impedance meter body with a sensor surface, which impedance meter body is mounted in the stator in such a way that it can move axially, wherein measurements of the impedance between the rotor surface and the sensor surface are carried out during an axial movement of the impedance meter body and wherein the measured inpedance differences are utilized together with the size of the movement to determine the dielectric constant of the pulp, from which the degree of fiber concentration of the pulp is derived.
Sensor device for measuring the degree of fiber concentration in a pulp inside a machine, in particular a refiner for the manufacture of paper pulp, which machine comprises a stator and an opposing rotor, which form a grinding gap for the pulp, which sensor device is designed to be mounted in the stator to interact with a rotor surface and comprises an impedance meter body with a sensor surface, which impedance meter body is movable in an axial direction and is connected to an operating mechanism for axial movement relative to the housing, wherein the impedance meter body is arranged to measure the impedance between the sensor surface and the rotor surface during axial movement thereof and wherein the measured impedance differences are utilized together with the size of the movement of the impedance meter body to determine the degree of fiber concentration in the pulp.
Dependencies are inferred from the claim text.