Device for diluting fibrous stock

Abstract

Device for diluting a fibrous stock that includes a drum and a displacer. A center line of the drum is oriented at at least an angle of about 10° from horizontal. At least one feed opening is structured and arranged to feed the fibrous stock, at least one discharge opening is structured and arranged to discharge the fibrous stock, and the displacer includes a rotor. A drive is coupled to the rotor to transmit necessary energy for dilution.

Description

[0001] The present application claims priority under 35 U.S.C. .sctn. 119 of German Patent Application No. 100 46 169.7, filed Sep. 19, 2000, the disclosure of which is expressly incorporated by reference herein in its entirety.[0002] 1. Field of the Invention[0003] The invention relates to a device for diluting a fibrous stock having a drum provided with a displacer, in which a center line of the drum is tilted in reference to horizontal by at least about 10.degree.. The device includes at least one feed opening for the fibrous stock on its upper face and at least one discharge opening on its lower face.[0004] 2. Discussion of Background Information[0005] With the aid of such a device, for example, soiled used paper is to be mixed with water and disintegrated. However, it can also be provided for used paper that has already been cleaned or for virgin pulp.[0006] A process for diluting fibrous stock with a rotating drum having a displacer being used for performing the process is kno...

AI Technical Summary

Benefits of technology

[0010] Usually, a voluminous axial mixing does not occur so that a complete and non-coincidental processing of the stock introduced can be achieved. This results in a particularly even stock processing. Additionally, this non-mixing described has the advantage that, in the lower part of the diluting device, a dilution can be performed, without the layers positioned above losing their desired high viscosity. However, if a controlled axial mixing is to occur, it can easily be achieved by a carrier positioned correspondingly diagonal to a rotor and / or a braking element in the drum in a very steep arrangement. A mixing that is limited to certain zones is possible as well.

[0012] In addition to the elimination of high lateral forces, the standing arrangement of this diluting device has a quite decisive advantage when operated empty because it is much easier to empty a standing drum with discharge lying on its bottom as compared to a horizontal drum. Emptying is necessary, for example, for a grade change or during intended stops. Additionally, the vertical arrangement of this diluting device saves floor space, which is advantageous because sufficient height is usually available. Although the charging must then occur at a greater height, as a rule, even the charging of horizontal drums or stock diluting devices requires a plate conveyor.

[0013] The processing of the stock located in the ring channel occurs primarily by means of transverse forces which develop because of the relative motion of the rotor and the drum surrounding it. In order to intensify the transverse forces, both the rotor and the interior wall of the drum may be provided with protrusions, thus, e.g., by means of entrainers or brake rails. Preferably, they are arranged such that a radial distance between parts motioned in relation to one another remains at all times. In this manner, the danger of damage or blockages of the device is reduced decisively.

[0021] According to a further feature of the invention, entraining rails may be coupled to an exterior of the rotor. The entraining rails may be structured to axially extend at least about 200 mm along the exterior of the rotor. Further, the entraining rails can be structured to radially extend no more than about 100 mm from the exterior of the rotor, and, preferably, the entraining rails are structured to radially extend no more than about 50 mm from the exterior of the rotor. The entaining rails may be structured and arranged with a shape and size so that, when diluting soiled used paper, adhesion of plastic films or tape is prevented. Further, the entraining rails can be structured and arranged to be tilted relative an axis of the rotor.

Problems solved by technology

Drums of this type can achieve very positive diluting results, however, they require a constructive expense that is frequently not acceptable.

High sagging forces must be taken into account in a horizontal arrangement and the space required is considerable.

This results in a particularly even stock processing.

However, if a controlled axial mixing is to occur, it can easily be achieved by a carrier positioned correspondingly diagonal to a rotor and / or a braking element in the drum in a very steep arrangement.

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