초록 ▼

Significant improvements in papermaking control can be achieved by employing an array of sensors that are positioned underneath the wire of the machine to measure the conductivity of the aqueous wet stock. The conductivity of the wet stock is directly proportional to the total water weight within th

Significant improvements in papermaking control can be achieved by employing an array of sensors that are positioned underneath the wire of the machine to measure the conductivity of the aqueous wet stock. The conductivity of the wet stock is directly proportional to the total water weight within the wet stock; consequently, the sensor provides information which can be used to monitor and control the quality of the paper sheet produced. Because CD water weight profile is obtained practically instantaneously, the MD and CD variations are essentially decoupled. Quality improvements to the sheet fabricated will be achieved by providing fast control of the actuators on the machine and by tuning components on the machine to eliminate the sources of variations. Further, the dry stock weight of a sheet of wet stock that is resting on a water permeable moving wire of the papermaking machine can be made employing a water weight sensor element that is positioned adjacent to the wire and that generates signals indicative of the water weight of the sheet of wet stock on the wire. Moreover, the moisture level cross-direction (CD) profile of a sheet of material that is produced can also be measured.

대표청구항 ▼

[ What is claimed is:] [1.] A system for determining the dry stock weight of a sheet of wet stock that is resting on a water permeable moving wire of a de-watering machine, which system comprises:(a) means for measuring the weight of the wire;(b) a water weight sensor element comprising a plurality

[ What is claimed is:] [1.] A system for determining the dry stock weight of a sheet of wet stock that is resting on a water permeable moving wire of a de-watering machine, which system comprises:(a) means for measuring the weight of the wire;(b) a water weight sensor element comprising a plurality of water weight sensor elements positioned adjacent to and underneath the wire and that generates signals indicative of the water weight of the sheet of wet stock on the wire;(c) means for measuring the aggregate weight of the wire and of the sheet of wet stock on the wire; and(d) means for calculating the dry stock weight of the sheet of wet stock that is resting on the wire.