Continuous on-machine control of bleaching chemicals

Details Continuous on-machine control of bleaching chemicals Continuous on-machine control of bleaching chemicals

G - Physics

05

D

341/35

G05D 11/00 (2006.01)

Patent

CA 1046609

ABSTRACT OF THE DISCLOSURE In a multi-stage bleaching system in which respect- ive bleaching chemicals are added to the stock in various stages, apparatus in which in the first stage in which chlorine is added to the brown stock, the first of a pair of sensing units associated with the stage comprises a source of red light directed onto the incoming brown stock and a suitable detector for sensing light scattered from the stock to produce a first signal representative of the brightness of the in- coming stock and the second similar sensing unit of the pair senses the brightness of the stock immediately following the addition of chlorine to produce a second signal. The first and second signals are compared to produce a difference signal indicative of the change in brightness independently of the condition of the incoming stock and this difference signal is compared with a set point standard to provide a control signal for regulating the addition of the chlorine to the brown stock.

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