Continuous on-machine control of bleaching chemicals

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing

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162238, 162252, 162DIG10, 356208, 356212, 356243, D21C 714

Patent

active

039805174

ABSTRACT:
In a multi-stage bleaching system in which respective 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 incoming 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.

REFERENCES:
patent: 3465550 (1969-09-01), Strom et al.
patent: 3729375 (1973-04-01), Chappelle
Burnett, J. C., "Computer Control of the Chlorine Stage", Pulp and Paper Magazine of Canada, vol. 71, No. 14, July 17, 1970, pp. 57-62.

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