Method for determining the relative quantity of shives in a stre

Details Method for determining the relative quantity of shives in a stre Method for determining the relative quantity of shives in a stre

1978-10-04

1980-09-02

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

324 71CP, 356335, 356442, 364555, G01N 110, G01N 1502

Patent

active

042204992

ABSTRACT:
Relative shive incidence in a production flow line of paper pulp is continuously sampled and measured by means of a continuous flow, fiber induction device located within the production line to extract a diluted sample of fiber flow therein. The diluted sample is directed through a windowed conduit section for photodetection of particles therein. Particle caused pulses are discriminated by amplitude relative to a reference scale to distinguish shive particles from acceptable fiber particles. Two pulse trains are developed simultaneously: one pulse train for shive pulses and the other pulse train for particle flow including shives. Both pulse trains are rate determined by counting the number of pulses in a fixed interim of time identical to both. The two pulse rates are then combined to develop a dimensionless ratio of shive incidence or percentage within the total fiber stream.

REFERENCES:
patent: 3461030 (1969-08-01), Keyes
patent: 3626166 (1970-04-01), Berg
patent: 3714444 (1973-01-01), Carr et al.
patent: 3724957 (1973-04-01), Tamate et al.
patent: 3855455 (1974-12-01), Allinger et al.
patent: 3858449 (1975-01-01), Singer
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patent: 4018089 (1977-04-01), Dzula et al.
patent: 4021117 (1977-05-01), Gohde
patent: 4037966 (1977-07-01), Hill
patent: 4066492 (1978-01-01), Hill
Johnson et al., "International Mechanical Pulping Conf." 1973; Proceedings Session V & VI; Stockholm, Sweden (6-1973).
Hill, et al., "Evaluation of Screens by Optical Measurements" TAPPI; vol. 58, No. 10, pp. 120-124 (10-1975).

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