Method and apparatus for preparing and cleaning fibrous material

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 55, 209 17, 209211, 209273, D21D 502, D21D 520, D21D 522

Patent

active

041674383

ABSTRACT:
A method and a system for cleaning and classifying fibrous suspensions whereby the suspension, by screening, is divided into a first stream of accepted stock and a second stream of rejected stock. The latter is then screened once more and thereby divided into a third stream of accepted stock and a fourth stream of rejected stock. The third stream is added to the first stream, whereas only the fourth stream is subjected to a fibre flake break-up process followed by a further screening process resulting in a stock finally rejected and an accepted stock added to the fibrous suspension upstream of the means for carrying out the first screening.

REFERENCES:
patent: 3873410 (1975-03-01), Chupka
patent: 3964996 (1976-06-01), Holz et al.
patent: 4107033 (1978-08-01), Holz
patent: 4111373 (1978-09-01), Holz
Hutzler, "A New Screen for Wastepaper Systems" TAPPI, vol. 58, No. 11, Nov. 1975, pp. 68-70.

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