US 4,283,275 AGranted

Apparatus for processing waste paper

AssigneeEscher Wyss Limited

InventorsWolfgang Heinbockel, Wolfgang Siewert, Albrecht Kahmann, Gerhard Lambrecht

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Abstract

An installation for processing waste paper containing a stock pulper or slusher equipped with a rotor and two sieves or screens having different size holes or openings. By means of the sieve having the larger size openings there is conducted the obtained stock suspension through a primary line system which, for instance, leads to a papermaking machine. Cooperating with the sieve having the larger size openings or holes is an auxiliary circulation circuit containing a device for the removal of contaminants or rejects. There is preferably arranged at the auxiliary circulation circuit or system a separator for heavy contaminants or rejects, a pump, a secondary stock pulper or fiberizer and a sieve or filtering device.

Claims8

Dependent claims

An apparatus for the processing of waste paper, comprising:

a stock pulper provided with a container means;
a rotor arranged within said container means of said stock pulper;
a first sieve plate having holes and located at the region of said rotor;
the liquid stock suspension formed by defiberizing the waste paper passing through the holes of said first sieve plate for further treatment and processing in a paper-making machine;
a second sieve plate provided with holes and arranged at the region of sid rotor within said container means of said stock pulper;
the holes of said second sieve plate being larger in size than the holes of said first sieve plate;
an auxiliary circulation system containing line means operatively connected with the larger holes of said second sieve plate;
said line means leading back to said stock pulper;
and
at least one device provided for said auxiliary circulation system for the removal of undesired constituents from said stock suspension.

7 more elements

Dependencies are inferred from the claim text.