Method and apparatus for producing uniform pulp yields by contro

Details Method and apparatus for producing uniform pulp yields by contro Method and apparatus for producing uniform pulp yields by contro

1987-12-16

1989-12-12

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

73 63, 162 61, 162253, 162254, 241 28, 241 33, 241 35, 241 36, D21B 114, D21C 712, D21D 130

Patent

active

048865761

ABSTRACT:
A 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 uniform 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 freeness of the output fiber slurry. Also, one or more of the cooking parameters is controlled by the UV analyzer to control the fiber yield.

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