D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
8/79
D21C 9/14 (2006.01) D21C 9/10 (2006.01) D21C 9/12 (2006.01) G05B 15/00 (2006.01)
Patent
CA 1057906
ABSTRACT OF THE DISCLOSURE A method for automatic control of the dosageing of chlorine dioxide and chlorine and for controlling the quality of pulp by instrumentation in a continuous pulp bleaching pro- cess. The process involves at least one chlorination step preceded by pretreatment of the pulp with chlorine dioxide. The hardness of the unbleached pulp, washing losses, and other factors affecting the total demand on active chlorine, or the variation of these factors, are observed, e.g., by means of laboratory methods. The relative share of the chlorine dioxide dosaged in connection with the pretreatment in the total quantity of active chlorine that is dosaged in the pretreatment and in the chlorination stage together is made to follow the hardness of the unbleached pulp, the desired hardness after the chlorina- tion stage or after the alkali stage following after the chlorina- tion stage, and possibly some other process variables. The following takes place in accordance with a mathematical empire function that is being constantly calculated.
229324
Hyvari Pentti
Soininen Jaakko
Oy Nokia Ab
Oy.kaukas Ab.
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