Method for defiberizing waste paper in a thick stock range
AssigneeEscher Wyss Limited
InventorsHermann Mayr, Albrecht Kahmann, Gerhard Lambrecht, Wolfgang Heinbockel, Wolfgang Siewert, Josef Maier
Life of this patent
Estimating the term…
Abstract
Waste paper is defiberized within a container or receptacle in a thick stock range at a low water level. Thereafter, by further infeeding water, the obtained slurry or the like is diluted to a consistency of less than 7% while continuing the defiberizing operation. Finally, the obtained stock suspension is withdrawn through a sieve or screen located at the floor of a defiberizing container. The defiberizing container or receptacle used for performing the method possesses a lower region having a smaller diameter, above which there is located an upper region having a larger diameter.
Claims8
In a method of defiberizing waste paper in a thick stock range having a consistency greater than 10%, wherein the waste paper is defiberized in a defiberizing container possessing a rotor under the addition of an appropriate quantity of water and, if desired, chemicals, the improvement which comprises the steps:
- defiberizing the waste paper at a consistency greater than 10% in a single defiberizing container;
- subsequently diluting the defiberized stock located said single defiberizing container to a consistency of less than 7% through the addition of water and thus placing the stock into a fluent and pumpable state in order to obtain a thin stock;
- continuing said step of defiberizing the waste paper in said single defiberizing container during said step of diluting the defiberized stock;
- thereafter withdrawing the thus obtained thin stock through a screen located at a lower region of said single defiberizing container for further use of said thin stock;
- and
- withdrawing residues which have not penetrated through the screen through a screenless opening located at the lower region of said single defiberizing container.
Dependencies are inferred from the claim text.