Method of treating waste paper for obtaining a stock suspension

Details Method of treating waste paper for obtaining a stock suspension Method of treating waste paper for obtaining a stock suspension

1979-02-12

1980-08-26

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 55, 209 17, 209616, 209173, 241 21, 241 28, 241 46R, 241 4617, 241 79, 241 78, D21C 502

Patent

active

042193818

ABSTRACT:
A method and apparatus for treating waste paper by pulping or defibering the paper in a stock pulper or slusher while infeeding water, wherein there are removed in succession, externally of the stock pulper, heavy weight particles, floatable substances and plastic foils. Thereafter, paper constituents which have incompletely defiberized are removed and further defibered in a special apparatus. The already defibered fibers are directly infed for further processing. The removal of the contaminants can be accomplished at a suspension density in the order of 1%, whereas the defibering or pulping of the waste paper in the stock pulper occurs at about 4%. The employed sorting apparatus is connected with the stock pulper, while dispensing with the use of a sieve or screen.

REFERENCES:
patent: 3113733 (1963-12-01), Carlson
patent: 3716197 (1973-02-01), Craig et al.
patent: 3814336 (1974-06-01), Brewer

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