Method and apparatus for the processing of groundwood pulp to re

Details Method and apparatus for the processing of groundwood pulp to re Method and apparatus for the processing of groundwood pulp to re

1986-03-27

1991-03-19

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With plural or specified mechanical defibering step

162 49, 162254, 162258, 241 28, B02C 2328, D21C 130, D21D 134

Patent

active

050008234

ABSTRACT:
Coarse wood residues, slivers and shives present in groundwood pulp as obtained in grinders are removed by passing a uniform flow of the pulp suspension containing coarse wood residues and shives from the grinder to a conical crushing and beating refiner having two treatment zones with a stationary part and a rotary part for reducing all wood material present in the suspension to free fibers, while measuring and controlling the freeness of the pulp within selected limits by controlling both the power input to the grinder and the power input to the conical crushing and beating refiner, and the degree of beating of the pulp, obtaining groundwood pulp having a low shives content and superior strength properties, at a low energy consumption.

REFERENCES:
patent: 2934278 (1960-04-01), Roberson
patent: 3816241 (1974-06-01), Blume
patent: 4207139 (1980-06-01), Haikkala
patent: 4257563 (1981-03-01), Henrich
patent: 4280868 (1981-07-01), Hoglund et al.
Moore, "Refiner Control-Working Group Report", Paper Technology and Industry, Sept. 1979; pp. 265-258.
MacDonald et al., Pulp & Paper Manufacture Second Ed., vol. III, pp. 150-155, New York, 1970.

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