Patent ID: 6174410
Filing Date: 2001-01-16
Classification: D21B,D21C,D21F,Y02W,Y10S

Abstract:
A process for recovering raw materials from a stream of residual or collected material composed of a plurality of different materials having a consistency in water from above 0 up to 6% by weight and which results from the manufacture of paper and are discharged from at least one of a paper mill, a paper material processing installation and a paper machine, comprising the steps ofdirectly feeding the stream of residual or collected material discharged from said at least one of the paper mill, the paper material processing installation and the paper machine to a separating installation for separating out at least one fiber fraction contained in the stream of residual or collected material without modification of the consistency of the stream;separating the fiber fraction from the stream of residual or collected material by vibratory screening thereof; andseparating an ash fraction containing black particles from the stream of residual or collected material by vibratory screening thereof after the step of separating the fiber fraction has been effected;wherein the step of separating the fiber fraction comprises a plurality of vibratory screening operations using screens of different types by which the fiber fraction is separated, depending on desired fiber size, into at least two different classes of fiber which are independently reusable, andwherein the screening operations comprise gravity action cascade screening operations using the effect of the force of gravity.