Abstract
The head box on No . 1 papermaking machine at Empire Paper Mills is an Escher Wyss pressurised type, which is run by direct digital control from the digital control computer. Control outputs are to air valves, thin stock by-pass valves and slice.
The head box stock level is maintained at α mean value by the air pressure within. The main stream flow into the head box by α coarse/fine by-pass system under DDC from the main stream magnetic flow meter. The total head now takes up some value as α dependent variable.
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