Process and apparatus for treating waste paper

Details Process and apparatus for treating waste paper Process and apparatus for treating waste paper

1978-12-29

1980-11-04

Kratz, Peter F.

Solid material comminution or disintegration

Processes

Wood and similar natural-fibrous vegetable material

162 4, 162 55, 209 3, 241 29, 241 4617, 241 78, B02C 2338, B02C 2310, B02C 2314

Patent

active

042315263

ABSTRACT:
A process and plant for treating waste paper in which a beater is employed for rough-pulping the waste paper followed by a first sorting stage from which the separated-out foreign matter is processed further in a subsidiary circuit which includes a vibratory sorter for lightweight foreign matter and a hydrocyclone for heavy foreign matter, the fibers separated out during this further processing being returned again to the treatment process. In the first sorting stage, a sufficiently rigorous separation process is carried out to remove the greater part of the foreign matter, together with unpulped lumps of fibers, which is then passed to the subsidiary circuit in which it and half-stuffs still containing foreign matter, which have been sorted in the hydro-cyclone and in the vibratory sorter, are subjected together to a multi-stage further sorting and speck-removing process. The plant is characterized in that the strainer has such small holes that, in general, only pulped fibers can pass through it, and in that in the subsidiary circuit behind the vibratory sorter and the hydro-cyclone a second sorter is arranged, the half-stuff outlet duct from which opens out again in the treatment process.

REFERENCES:
patent: 2947655 (1960-08-01), Eberhardt
patent: 3405803 (1968-10-01), Bahr et al.
patent: 3844488 (1974-10-01), Neitzel
patent: 3925150 (1975-12-01), Marsl
patent: 4017033 (1977-04-01), Tra

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