Immediate feedback control of a pulp refiner

Details Immediate feedback control of a pulp refiner Immediate feedback control of a pulp refiner

D - Textiles, Paper

21

D

92/41

D21D 1/20 (2006.01) D21D 1/00 (2006.01) D21F 1/00 (2006.01) D21G 9/00 (2006.01) G01N 33/34 (2006.01)

Patent

CA 1267016

13 IMMEDIATE FEEDBACK CONTROL OF A PULP REFINER ABSTRACT OF THE DISCLOSURE Immediate and accurate control of a pulp refiner is provided so as to control the degree of refining in the production of mechanical pulp, such as RMP, TMP, and CTMP. The mechanical pulp discharged from a refiner is fluidized by a fluidizing centrifugal pump, the fluidizing action instantaneously removing the pulp latent properties. A sample of the latency-removed pulp is then subjected to a pulp freeness measurement, and that freeness measurement is supplied to a computer. The computer utilizes the freeness measurement, as well as other measurements such as pulp consistency and flow rate measurements, and dilution flow measurements, and in response to the inputs control refiner parameters to ensure that the freeness of the mechanical pulp being produced is within the desired range. The refiner parameters controlled can be the hydraulic plate loading (refining pressure), and/or the tonnage of fiber supplied to the refiner.

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