US 4,397,713 AGranted

Method of processing waste paper and installation for the performance of the method

AssigneeEscher Wyss Limited

InventorGerhard Lambrecht

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method of preparing waste paper wherein the waste paper is defiberized in water within a stock slusher or pulper. Following the stock pulper there is removed from the stock suspension all of the already available good stock fibres by means of a sieve or screen device. The remainder of the stock suspension is then subjected to a comminution action and is again screened. The screening and comminution can take place in a first fiberizer or secondary pulper having a finer sieve or screen than a conventional secondary pulper. The overflow of the first secondary pulper is infed to a second secondary pulper and the overflow thereof is then fed to a dynamic jarrer or vibrator. Forwardly of the dynamic jarrer there is arranged a vat containing a circulation system of a despeckling device.

Claims4

Dependent claims

An apparatus for preparing waste paper for obtaining stock suspension for the fabrication of new paper and cardboard, comprising:

a stock slusher through which passes waste paper;
at least one fiberizer arranged after and cooperating with the stock slusher;
said at least one fiberizer containing a housing;
a screen and a motor-driven rotor arranged within said housing;
said rotor having arm means movable along said screen;
outlet means through which flows good stock which has passed through the screen arranged in flow communication with said screen;
said housing having at least one outlet for overflow material effluxing from said housing;
said screen of said at least one fiberizer containing perforations of a size suitable for separating fibers which can be directly used for paper fabrication;
a vat of a papermaking machine connected in flow communication with the outlet means for the good stock of said at least one fiberizer;
said at least one fiberizer contains an outlet line for lighter overflow material;
a dynamic vibrator with which there is operatively connected said outlet line for the lighter overflow material of said at least one fiberizer;
a vat means located at the outlet line for the lighter overflow material of said at least one fiberizer and flow communicating said outlet line with said dynamic vibrator;
circulation flow means provided for said vat means;
a despeckling device arranged in said circulation flow means of said vat means;
and
a throughflow container provided for the dynamic vibrator;
and
said throughflow container being connected with said vat of the papermaking machine.

15 more elements

An apparatus for preparing waste paper for obtaining stock suspension for the fabrication of new paper and cardboard, comprising:

a stock slusher through which passes waste paper;
a first fiberizer arranged after and cooperating with the stock slusher;
said first fiberizer containing a housing;
a screen and a motor-driven rotor arranged within said housing;
said rotor having arm means movable along said screen;
outlet means through which flows good stock which has passed through the screen arranged in flow communication with said screen;
said housing having at least one outlet for overflow material effluxing from said housing;
said screen of said first fiberizer containing perforations of a size suitable for separating fibers which can be directly used for paper fabrication;
a vat of a papermaking machine connected in flow communication with the outlet means for the good stock of the first fiberizer;
a second fiberizer connected with the at least one outlet for the overflow material of the first fiberizer;
said second fiberizer containing a screen having perforations of a size suitable for screening essentially all fibers which can be directly used for paper fabrication;
said second fiberizer having outlet means for good stock which has passed through the screen of said second fiberizer;
said outlet means of said second fiberizer being connected in flow communication with said vat of the papermaking machine;
the perforations of the screen of the first fiberizer containing holes having a diameter in a range of approximately 2 to 3 millimeters;
said second fiberizer contains an outlet line for lighter overflow material;
a dynamic vibrator with which there is connected said outlet line for the lighter overflow material of the second fiberizer;
a vat located at the outlet line for the lighter overflow material of the second fiberizer;
circulation flow means provided for said vat;
and
a despeckling device arranged in said circulation flow means of said vat.

17 more elements

Dependencies are inferred from the claim text.