Method of controlling a pulp refiner by measuring freeness and r

Details Method of controlling a pulp refiner by measuring freeness and r Method of controlling a pulp refiner by measuring freeness and r

1985-07-15

1986-12-02

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 52, 162 61, 162254, D21D 120, D21D 520

Patent

active

046263187

ABSTRACT:
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.

REFERENCES:
patent: 4361464 (1982-11-01), Karnis
patent: 4435193 (1984-03-01), Gulichsen et al.
Dawson et al, "A Method for Developing Latent Properties of Mechanical Pulps," vol. 79, No. c, p. 81, Pulp & Paper Canada.
TMPCON: Thermo-Mechanical Pulping Control--A Modern Means of Controlling Pulp Quality, pp. 2, 3, 4.
DRT--EUR-Control In-Line Refining Analyzer for Analysis of the Refining Result (EUR-Control D 218.35/1-e.multidot.a).

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