Classifying – separating – and assorting solids – Plural – diverse separating operations – Aqueous suspension and sifting
Patent
1994-12-07
1996-08-06
Terrell, William E.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Aqueous suspension and sifting
209273, 209306, 162 49, 162 55, 162263, B03B 700, D21C 714
Patent
active
055425429
ABSTRACT:
A method and apparatus are described for continuously sampling a process stream, or reservoir of aqueous cellulosic pulp and detecting oversize contaminants in the sampled stream. This serves the overall objective of estimating the level of contamination in the process stream or reservoir during a given period of production; the method may include the following stages: 1) a continuous sample stream is drawn from the process or main stream, 2) the stream is passed through a centrifugal device which divides the sampled stream according to density, 3) the stream with the higher level of contaminants from the centrifugal device is passed to a screen which isolates the contaminants, and 4) the contaminants are flushed from the screen so that they can be quantified; these measurements are used to assess the purity of the material being produced. One useful application of this invention is to assess the presence of trace amounts of plastic contaminants in the production of the cellulosic pulp. Compared to manual methods for inspecting for plastic, this invention provides a measurement which is more accurate, more convenient, and less subjective.
REFERENCES:
patent: 3709614 (1973-01-01), Hayakawa
patent: 3912622 (1975-10-01), Bolton et al.
patent: 3964996 (1976-06-01), Holz et al.
patent: 4252640 (1981-02-01), Musselmann
patent: 4301000 (1981-11-01), Rankin
patent: 4443331 (1984-04-01), Amand
patent: 4620671 (1986-11-01), Skaar
patent: 4646979 (1987-03-01), Musselmann et al.
patent: 4726880 (1988-02-01), Smith
patent: 4758308 (1988-07-01), Carr
patent: 5000842 (1991-03-01), Ljokkoi
patent: 5405499 (1995-04-01), Vinson
The Globe and Mail, "Plastic Places Paper Sales at Risk", Apr. 14, 1984.
Pulp and Paper Journal, Jan. 1984, vol. 37, No. 1, "Plastic Contamination Costing Pulp Mills Dearly", Bob Westergaard.
Pulp & Paper Canada 89:1 (1988), "Plastic Contamination in the Pulp Mill: An Overview", M. A. Robitaille.
Pulp & Paper, Jun. 1990, "New Lightweight Cleaner Units Solve Mill's Plastic Problems", Michel Marson.
Light Weight Cotaminant Monitoring System, Gadget #16, St. Anne-Nackawic Pulp Company Ltd., M. A. Robitaille.
Gooding Robert W.
Hart Robert S.
Hoffmann John D.
Roberts Norman
Nguyen Tuan N.
Pulp and Paper Research Institute of Canada
Terrell William E.
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