New Automatic Control System for Fiber Orientation and Improvement of the Quality of Copy Paper, 2008 PAPERCON Conference

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A new automatic control system for fiber orientation has been developed. In this system, the fiber orientation on both paper surfaces is measured continuously, and the edge flow valves and the slice lip actuators at the headbox are manipulated automatically to minimize the differences of orientation angles between the felt and wire sides of paper. By this automatic control system, the average degree of twist-curl of paper is able to be reduced to less than half before and it is possible to produce copy paper with low degree of twist-curl continuously. This system has been installed in an actual paper machine and has been effectively controlling the twist-curl of copy paper since the beginning of 2007.