Method and device for examining pulp for the presence of shives

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

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162 50, 162263, 250339, 356 51, G01N 1502, G01N 2134

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active

040664929

ABSTRACT:
In a method for examining pulp for the presence of shives therein a suspension of the pulp is passed through a measuring duct with transparent walls and at least one beam of light having a wavelength within the intra-red range from 750 to 950 nm is directed through the measuring duct perpendicularly to the direction of flow of the pulp suspension therein. The intensity of the light beam after its passage through the measuring duct is measured by means of a photo detector and the output signal of the photo detector is analyzed with respect to amplitude variations therein. The measurement is independent and insensitive to the type of pulp.

REFERENCES:
patent: 3498719 (1970-03-01), Wing et al.
patent: 3518003 (1970-06-01), Meyn
patent: 3652850 (1972-03-01), Briggs
patent: 3724957 (1973-04-01), Tamate et al.
patent: 3823320 (1974-07-01), Ledoux
patent: 3879129 (1975-04-01), Inoue
patent: 3980517 (1976-09-01), MacTaggart
Brecht et al., "Spot and Shive Counts in Halfstuffs and Whole Stuffs by Means of Optical Electronic Instrument," Papies 22, No. 10A, 784-792, 10-1968, Abstract 8656, ABIPC, vol. 39, No. 10, (Apr. 1969).
Johnsson, et al., "Determination of Dangerous Shives," Internatl. Mechanical Pulping Conference, 1973.

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