D - Textiles – Paper – 21 – B
Patent
D - Textiles, Paper
21
B
92/34
D21B 1/14 (2006.01) D21C 7/12 (2006.01) D21D 1/00 (2006.01)
Patent
CA 1303401
METHOD AND APPARATUS FOR PRODUCING UNIFORM PULP YIELDS ABSTRACT OF THE DISCLOSURE An improved method and apparatus for producing uniform pulp yields, wherein at least a refiner is controlled in accordance with the UV absorbance of the lignin dissolved in the digester cooking liquor, thereby to produce for a given quantity of wood chips a unform pulp yield. A backflow control valve is automatically adjusted to maintain uniform flow of a sample of the digester cooking liquor through a UV analyzer, and a flushing arrangement is provided for flushing out contaminates such as sulphur dioxide from the system. Preferably the refiner is of the two- stage type, the first stage being automatically adjusted as a function of the UV absorbance of the digester cooking liquor, and the second stage being automatically adjusted as a function of the freshness of the output fiber slurry. Also, one or more of the cooking parameters is controlled by the UV analyzer to control the fiber yield.
562831
Boise Cascade Corporation
Borden Ladner Gervais Llp
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