EP2038475A2

EP2038475A2 - Device for the production or processing of pulp

Info

Publication number: EP2038475A2
Application number: EP07722529A
Authority: EP
Inventors: Bernhard Winterstein
Original assignee: GW Fasertechnik GmbH
Current assignee: GW Fasertechnik GmbH
Priority date: 2006-07-07
Filing date: 2007-06-16
Publication date: 2009-03-25
Also published as: DE102006031904B3; WO2008003283A3; WO2008003283A2

Abstract

The invention relates to a device for producing or processing pulp, comprising an essentially cylindrical vessel (1) for receiving the fibrous pulp material that is to be dissolved or processed. A rotor (4) which is arranged on the bottom (3) of the vessel so as to be rotatable at least substantially parallel to said bottom allows an aqueous phase located in the vessel to be rotated at a high speed in order to reduce the fibrous material to slurry or process slurry. The vessel is provided with an outlet for the slurry. In order to obtain a high solid content in the pulp while reducing power consumption, the rotor is radially surrounded by a stator ring (25, 40) which can be configured as a circumferentially continuous ring. The stator ring can extend to about half the height of the rotor blades. The inventive device can be embodied as a pulper or sorting machine.

Description

LIPPERT, STACHOW & PARTNER

P.O. Box 30 02 08, D-51412 Bergisch Cladbach Gu / rl

Telephone +49 (0) 22 04.92 33-0

Fax +49 (0) 22 04.6 26 06 13. June 2007

GW Fiber Technology GmbH 42781 Haan

Apparatus for the production or treatment of pulp

The invention relates to a pulp production apparatus for the production or processing of pulp with a substantially cylindrical vessel for receiving the fibrous material of the pulp to be dissolved or processed, wherein on the bottom of the vessel at least substantially parallel to the ground rotatable rotor is arranged, by means of which in the The aqueous phase can be set in rapid rotation to produce a fiber slurry or to treat an existing slurry, and wherein the vessel has an outlet for the fiber slurry prepared or prepared in the vessel.

Devices according to the invention are known, in particular, as pulpers (also called pulpers) and serve to dissolve as much as possible homogeneously fibrous material in a mostly aqueous phase in the vessel. Pulp and / or groundwood pulp can be used as a fibrous material in a dry or moist state, for example in the form of rolls, bales, machine broke, waste paper, etc. By rapid rotation of the rotor, the liquid in the vessel is likewise set in rapid rotation that a turbulent flow with high shear forces to form a vortex core is formed, whereby the fiber-containing material is divided and a homogeneous slurry as possible is generated. Of the The solids content of the pulp (fiber slurry) thus produced is conventionally up to a maximum of 5% by weight, based on the homogeneous slurry, ie without consideration of larger lumps of undissolved fiber-containing raw material, foreign bodies and the like. Like ..

Such preparation of a slurry entails a very high energy input in order to produce a sufficiently strong vortex and thus sufficiently strong shearing forces. Furthermore, there is a tendency to increase the solids content in the slurry, as this produces the production of the fiber slurry Products, such as paper, nonwoven fabric o. The like., Economical and / or can be done with a higher process speed. This need exists in particular, since an increase in the rotor speed is set economic and technical limits, for example by the power consumption of the associated drive motor. Furthermore, it is often desirable to retrofit existing devices so that they can then be operated with a higher solids content in the pulp. Furthermore, should be increased by the measure, if possible, the life of the pulper.

Furthermore, generic devices in the form of sorting machines are known in which an already present pulp (fiber slurry) is to be processed by "sorting out" unwanted foreign substances or insufficiently divided fiber-containing raw materials Again, there are often the above problems, in particular the power consumption of the sorting machine for a given throughput of pulp to reduce or to increase the efficiency of the sorting machine.Furthermore, the machine should be easy to retrofit here. The invention has for its object to provide a generic device with which an increased solids content in the pulp achievable and is easy to retrofit.

The object is achieved by the provision of a pulp production device of the type mentioned, in which according to the invention the rotor is surrounded on the outside by a stator ring. Such a stator ring, which is also easy to retrofit to the vessel, surprisingly drastically changes the flow behavior of the liquid set in the vessel, so that under otherwise comparable conditions such as the same vessel geometry, fill level, total fiber material content, and rotational speed of the rotor strong and stable vortex is generated. Furthermore, with comparable vortex formation in relation to a vessel without stator ring, a significantly lower power consumption of the rotor drive is observed with constant current consumption. At the same level and the same power consumption and total fiber content a higher solids content of fiber material in the liquid is readily achieved, which may be readily 10 to 20% higher than in a conventional pulper under otherwise identical conditions. The solids content of the pulp can thereby easily be 5.5-6 wt .-% or possibly more. Without being bound by theory, it is believed that through the stator annulus, the liquid moving radially outward from the rotor at high velocity is deflected vertically upward, greatly assisting vortex formation. The energy efficiency of pulp production is thereby significantly increased. Such high solids pulps, which are pumpable, also facilitate the subsequent production of fiber products such as e.g. Paper or nonwovens much more economical or faster process speed possible.

The above applies accordingly also in the application of a stator ring surrounding the rotor in the case of a sorting machine. machine, in which the pulp is usually passed through the sieve bottom of the vessel, which is arranged in the flow direction behind the rotor, with sorting out unwanted foreign matter. Again, the production of a strong and stable vortex through the stator has been found to be very conducive to handle a high solids content in the machine and to be able to accomplish a high pulp throughput. Again, the power consumption of the sorter can be significantly reduced with constant current consumption through the stator ring.

Generally, in a pulper, the vessel is positioned vertically so that the axis of rotation of the rotor is vertical and the bottom of the vessel is substantially horizontal. In a design as a sorting machine, the main vessel axis and the rotor axis are usually arranged horizontally, without this, however, being absolutely necessary. Optionally, the rotor axis of rotation of a sorting machine can also be arranged vertically.

Advantageous embodiments of the subject invention will become apparent from the dependent claims.

The stator ring is preferably formed as a full circumferential continuous ring, optionally, the stator can be composed of a plurality of annularly arranged stator elements, wherein the distance between the stator elements to each other is preferably less or substantially less than the circumferential extent of the same. Optionally, the individual stator elements can also be arranged over one another in the circumferential direction. In general, two or more concentric stator rings can be provided, in particular if these each consist of a plurality of annularly arranged individual stator elements.

The stator ring may be partially or preferably fully connected to the bottom of the vessel at its base, preferably liquid-tight. The stator ring can be subsequently fixed to the bottom of a vessel, for example by a welded joint. The stator ring can also be an integral part of the vessel bottom, for which purpose the vessel bottom can be attached laterally to the stator ring. This can be done on the inside and outside of the stator at different heights. The stator ring can thus be arranged on a continuous floor area.

The stator ring may be round, variously a particularly stable vortex formation takes place when the stator ring is non-circular, for example oval or ellipsoidal or possibly wave-shaped with varying distance to the rotor axis, without being limited thereto. The rotor facing Statorringwandung may have a continuously changing curvature. In particular, the stator can be made polygonal, for example, 4-6 square, or to 8- or 10- or 12-angular, each preferably as an equilateral polygon. It is assumed that the changing radial widths of the stator ring a vortex formation is supported.

The stator ring generally need not be continuous and may have apertures that may extend over its entire height. Preferably, the circumferential extents of the apertures are each smaller than the circumferential extents of the stator ring, e.g. 1/2 or 1/3 or 1/4 of the same or less. In the case of a polygonal stator ring, any openings are preferably arranged in the region of the edge centers. If the stator ring consists of individual annularly arranged stator elements, they may be arranged such that their longitudinal extent is at an angle to and intersects a corresponding circular arc centered in the rotor axis, e.g. are arranged fan-like.

Preferably, the stator ring extends along the rotor Axial at least partially over the height of the rotor, in particular over the height of the rotor blades. The stator ring may optionally extend in the direction of the rotor axis beyond the rotor or the rotor blades in the direction of the end of the vessel facing away from the rotor. Preferably, however, the rotor or the rotor blades over in the direction of the rotor axis via the stator ring. The stator ring can thereby have a comparatively small height and thus high stability, which is particularly useful when the vessel, a fiber-containing raw material with a significant proportion of foreign substances such as stones, etc. is supplied, which collide with high radial velocity on the stator and this can damage.

In most cases, the rotor of the device according to the invention has a plurality of rotor blades, for example 5, 6 or more, wherein the rotor blades can be fastened to a rotor base plate, through which the drive of the rotor can extend. The rotor blades can in this case project axially and / or radially beyond the rotor base plate. Preferably, the stator ring axially overhangs the rotor base plate, i. along the rotor axis of rotation, wherein the stator ring preferably extends only over part of the height of the rotor blades, but may optionally also project beyond the rotor blades in the axial direction. The stator ring may in this case be designed such that the upper edge thereof is arranged in a range of 10 to 90% of the height of the rotor blades, preferably in a range of 25 to 75%, particularly preferably 33 to 66% of the height of the rotor blades, in special at about half the height of the same. As a result, a very effective vortex core formation is possible, wherein the stator ring has only a relatively small height.

Overall, the height of the stator ring ≥ 10 to 20% and / or ≤ 150 to 200% of the height of the rotor blades or the rotor in total, in particular in the range of 50 to 100% or about 50% of the height of the rotor and / or the rotor blades. It goes without saying that the height of the stator ring also depends on the geometry of the bottom of the vessel, so that when the bottom of the vessel rises outwardly, the stator ring may have a lower height than with a flat bottom of the vessel in order to have the same positive effect on vortex nucleus formation ,

The height of the stator ring measured from its lower edge or the vessel bottom can be ≥ 10 to 20 mm and / or ≦ 250 to 300 mm, for example ≥ 30 to 50 mm and / or ≦ 150 to 200 mm or even ≦ 100 mm, for example, about 70 mm. Preferably, the height of the stator ring is between 30 to 150 mm, in particular about 70 mm. The height of the stator ring can in this case correspond approximately to the rotor blade height. This can apply in each case to powders and / or sorting machines, the stator ring in each case being adapted to the rotor.

The above statements with regard to the configuration of the stator ring can each refer to a partial extent or the full scope of the same.

It has proved particularly expedient if the stator ring has a radial spacing of ≥ 25-50 mm and / or ≦ 500-750 mm from the rotor or the radially outermost region of the rotor blades. The stator ring may in particular have a radial distance of ≥ 100 mm and / or ≦ 350 400 mm from the rotor, in particular from the rotor base plate and / or the rotor blades. The radial distance may be about 100 to 400 mm, or more preferably about 150 to about 300 mm, in particular about 150 to 200 mm from the rotor. This is especially true when the device is designed as a pulper or pulper. If the device is designed as a sorting machine, the distance of the stator ring to the rotor can be dimensioned as indicated above, in particular it can be in the range of 100 to 150 mm. The base of the stator ring may be attached above the lower edge of the rotor base plate or above the lower edge of the rotor blades of the rotor. This applies in particular when the vessel bottom rises radially outwards and the stator ring is arranged at the level of the rising region of the vessel bottom. The stator ring in this case has a much greater inclination than the bottom of the vessel. In general, ie even with substantially flat vessel bottoms, the stator ring may have an inclination of ± 45 ° to the rotor axis of rotation, preferably ± 20-30 °, more preferably ≤ ± 5-10 °. In particular, the stator ring may extend substantially vertically from the bottom of the vessel, ie parallel to the rotor axis of rotation.

If the bottom of the vessel increases radially outwards, then the stator ring can be mounted at the level of the rising area of the vessel bottom or at the base or the beginning thereof. The rising region of the vessel bottom can also attach to the stator ring, so that the stator ring on the side facing the rotor has a greater height than on the radially outer side, the vessel bottom thus has different heights on both sides of the stator ring.

Optionally, the vessel bottom may have a depression, in particular a substantially cylindrical depression, within which the rotor is arranged, so that the rotor is surrounded by a stepped shoulder. In this case, the stator ring can be arranged radially outside the step shoulder of the rotor.

In particular, in such an embodiment of the vessel bottom but also independently of this, the stator ring above the lower edge of the rotor base plate, possibly also above the lower edge of the rotor blades on the bottom of the vessel.

The vessel bottom may be provided with at least one or at least a plurality of radially extending ribs preferably evenly distributed around the rotor axis. Such ribs have a favorable influence on the disturbance conditions and in particular the vortex formation in the vessel. Such ribs may extend as far as the stator ring or be radially spaced therefrom, wherein the ribs are arranged to the stator ring for the most part radially outside, preferably only radially outside.

The stator ring or the plurality of annularly arranged stator elements can be designed in the simplest case as a sheet or extend generally linearly in the circumferential direction. However, the stator ring or elements may also have an extent in the axial direction. In particular, the rotorzu- and rotor side facing away from the same may be formed differently, for example, have a different inclination to the rotor axis. Further, a stator ring or elements have a non-linear cross-section, for example, in the upper region or at the upper edge thereof a radially inwardly and / or radially outwardly projecting collar, wherein a radially outwardly extending collar optionally up to the vessel bottom or the vessel wall can extend. The collar may extend substantially horizontally or have an inclination of ≤ + 30 ° -45 °, preferably ≤ ± 10 ° or ≤ ± 5 ° to the horizontal. The collar can run completely. The stator ring can thus also be designed as a stamping or stepped shoulder of the vessel bottom, but it is preferably designed as a protruding element, for example a separate element, from the bottom. The collar can thus reach or abut the vessel bottom with its leg facing away from the rotor and optionally be connected thereto, eg by a welded connection. The leg facing away from the rotor can also end at a certain distance from the bottom of the container, for example 1-10 times or 5-10 times the material thickness of the collar or at a distance of less than / equal to or greater than the single height of the vertical leg. or <or ≥ 1/2 or 1/4 of the height of the vertical leg, preferably in each case starting from the base of the vessel bottom.

The bottom of the vessel may be formed below the rotor as a mesh plate, which may form the vessel outlet for the fibrous slurry or pulp. This applies in particular to a design of the device as a sorting machine but also as a pulper. The vessel outlet can also be provided in each case on the vessel side wall.

By means of a pulper according to the invention, a fiber slurry, in particular of cellulosic material for papermaking, can thus be produced in such a way that the slurry has a solids content of ≥ 5% by weight, in particular ≥ 5.25-5.5% by weight, more preferably up to 5.75% to 6% by weight, or more based on homogeneously distributed fibers in the slurry, of which non-homogeneously distributed impurities such as stones, other foreign particles or undivided fibrous matter are dispersed in the aqueous phase of the slurry Raw material should not be taken into account when determining the solids content. The slurry may then be subjected to further operations to produce a fibrous material such as e.g. Paper, nonwovens, etc., or materials containing such fibrous material. With a corresponding rotational speed of the rotor, which is within the usual operating range of a rotor of a pulper, it is thus possible to obtain such a high solids content of the slurry due to the particular vortex formation in the device according to the invention. It is understood that due to the higher solids content, the manufacturing process of the respective fibrous material, e.g. Paper can be made much more economically, with higher process speed and with lower energy input.

Simultaneously or alternatively, the rotor can also be operated at a rotational speed, so that Because of the inventive design of the device in the pulp, a vortex core is produced, which extends to 10 to 20% or less of the filling level of the vessel in said operating state or with rotating rotor to the rotor. This can apply to a design of the device as a pulper or sorting machine. When designed as a sorting machine with a horizontal arrangement of the rotor axis of rotation, the vortex core can extend to ≤ 10 - 20% or ≤ 5% of the axial extent of the vessel to the rotor approach, or up to this. In this way, the throughput can be increased by the device under otherwise identical operating conditions without stator. Such a vortex core is particularly stable and also exerts particularly high shear forces on the fiber-containing material, so that a rapid and effective homogenization of the slurry takes place, which is made possible by the stator ring according to the invention. Furthermore, in the case of such a mode of operation of a pulper, the fiber-containing raw material, which may be present in particular in the form of webs or bales, can be introduced or drawn into the liquid phase in a simple manner, which considerably facilitates the division. Additional mechanical devices such as rammers, hold-downs or the like can be dispensed with and the homogenization time can be considerably reduced.

The invention will now be described by way of example and with reference to the figures. Show it:

FIG. 1 shows a schematic representation of a pulp production and conditioning plant;

FIG. 2 shows a schematic representation of a pulper in cross section (FIG. 2 a) and in plan view (FIG. 2 b),

FIG. 3 shows a representation of the pulper according to FIG. 2 with rotor,

FIG. 4 shows a sectional view of a rotor with stator ring, FIG. 5 shows a sectional illustration of a further embodiment of a pulper according to first and second variants,

FIG. 6 shows a sorting apparatus in partial elevation (FIG. 6 a) and in cross section (FIG. 6 b),

Figure 7 is a schematic representation of a non-circular stator ring in plan view.

According to Figure 1, the plant for the production and processing of pulp, a pulper (pulper) and / or a sorting device, which may be carried out according to the invention. The pulper 1 consists essentially of a vessel 2 at whose bottom 3 a rotor 4 with associated drive 5 is mounted, wherein the rotor axis of rotation 6 of the rotor is vertical.

Through the upper vessel opening 7, fiber-containing raw material 8, for example, waste paper in bale form can be supplied. The aqueous phase contained in the vessel 2 is transferred by the high speed rotor into a high turbulent flow to form a vortex 9 to produce a pumpable fiber slurry by the resulting shear forces. The fiber slurry can be removed from the pulper by means of a vessel outlet 10 provided with a shut-off device and fed to a sorting device 12 via an intermediate pumping device 11, by means of which contaminants can be withdrawn. In this case, optionally from the water reservoir 13 wash water by means of the line 13a of the supply line to the pumping device 11 or possibly also the direct supply to the sorter 12, are supplied to adjust the desired FestStoffgehalt the pulp. It can also be supplied to the pulper from the water reservoir 13 washing water, in particular to compensate for water consumption. The sorting device 12 in this case also has a driven by a drive 14 rotor 15, which is arranged in front of a screen plate 16. The sorting device 12 In this case, it can be arranged "lying" with the horizontal rotor axis 17. The pulp can be returned to the pulper or fed to the further processing of the fibrous material such as a papermaking machine through the sieve plate 16. The sorted coarse material can be fed to the outlet 18 located upstream of the sieve plate 16 Further, in the pulper, coarse material passing through the sieve plate 19 may be further processed through the outlet 20. Through the outlet 21 of the vessel 2 undesirable heavy material such as stones, etc. thrown radially outwardly from the rotor may be removed and the processing device 22 are supplied.

According to FIG. 2, a fully formed stator ring 25 is arranged on the bottom of the vessel 3 and surrounds the rotor receptacle 26 annularly and in full circumference. The stator ring 25 is in this case essentially produced as a cylindrical sheet or in the manner of a pipe section. The rotor receptacle 26 can be delimited by the screen plate 19 on the side facing away from the vessel interior. The stator ring 25 extends in this case with its main axis 27 in parallel, more precisely coaxially, to the rotor axis 6. The stator ring wall 28 facing the rotor likewise extends parallel to the rotor axis 6, but if necessary this can also have an inclination to the latter. The vessel bottom 3 rises in this case at its radially outer region 29 to the outside, if necessary, the bottom can also be flat. The bottom region lying radially outward to the stator ring is in this case attached to the outside of the stator ring 25, that is to say offset upwards from the lower region 30 of the rotor receptacle. The radially inwardly and outwardly disposed of the stator ring bottom portion of the vessel 2 is thus formed asymmetrically. It is understood that, where appropriate, the stator ring can also be arranged on a region of a continuously steplessly extending bottom of the vessel. If necessary, the stator ring can thus be subsequently attached to the bottom of an existing vessel become. Independently of this, the stator ring can be connected in a liquid-tight manner to the bottom of the vessel over its predominant or entire circumference.

Radially outwardly extending to the stator ring 25 are further provided substantially radially extending ribs 31, the height of which is substantially greater than that of the stator ring, e.g. more than twice the height, but may also correspond to the height of the stator ring. The ribs 31 contribute to the vortex formation of the fluid rotated by the rotor. The ribs 31 thus have at their end portions 32 a certain distance from the stator ring, which may be in the range of half to one or more times the stator height. The vessel inner wall may also be provided with flow diverters, e.g. Ribs 33 may be provided, which can dress a supply or discharge.

FIG. 3 shows the vessel designed as a pulper according to FIG. 2 with mounted rotor. The rotor 4 in this case has a base plate 35 and above the same arranged rotor blades 36, which are usually arcuate, with any types of known rotors can be used. The radial extent of the rotor blades can thus be equal to, larger or smaller than that of the base plate. In this case, the stator ring 25 extends with its upper edge 36 beyond the rotor base plate 35 in the direction of the upper wing back, so that the rotor as a whole projects axially beyond the stator ring in the direction of the rotor longitudinal axis. The upper edge of the stator ring is arranged here approximately at half the height of the rotor blades with a larger radial extent, the radial extent of which may correspond to the maximum radial width of the rotor base plate. Further, on the rotor further rotor blades 38 may be provided with a smaller radial extent, the height of which may be greater than that of the first rotor blades 36, for example, twice the height of the same or more. The height of the stator ring 25 in total can thus be approximately the height of the rotor blades, in particular the rotor blades correspond with greater radial extent. The radial distance d of the stator ring from the radially outer region of the rotor base plate and / or rotor blades can be, for example, approximately 150 mm. The height of the stator ring may be, for example 70 mm, which may correspond approximately to the height of the radially outer rotor blades. Generally, the stator ring can thus protrude by ≥ 10 mm or ≥ 20 mm over the rotor base plate, for example about 30 mm or more.

The base 39 of the stator ring can in this case below the bottom of the rotor base plate, if necessary, this can also be arranged at the same height. The stator ring is thus according to the embodiment an integral part of the vessel bottom. However, the stator can also be subsequently attached to the bottom of the vessel and in this case be placed on a continuous floor area with preferably constant slope, for example, to retrofit an existing device such as pulper or sorter.

FIG. 5 shows a further embodiment of a stator ring in the case of a vessel with a vessel bottom rising outwards. The arrangement of such a stator ring is shown for a pulper, but may also be present in another device according to the invention, in particular a sorting machine. The stator ring 50 in this case has a radially outer collar 51, which extends according to the embodiment up to the vessel wall 52. The collar 51 attaches to the upper edge 53 of the stator ring, it may optionally be spaced therefrom. The collar also extends substantially perpendicular to the rotor axis of rotation. The vessel bottom 3 can have a first substantially horizontal region 54 surrounding the rotor, which can transition into an outwardly rising region 55. The collar 51 attaches here to the outwardly rising portion 55 of the vessel bottom. The stator ring thus has an angular cross-section which is not at a 90 ° angle between the collar 51 and cylindrical ring 56 is limited. The bottom of the vessel is not limited to this embodiment and may, for example, rise immediately adjacent to the rotor or even extend as far as the lateral outer wall. According to Figure 5a, the collar is spaced from the bottom of the vessel, according to Figure 5b, the collar abuts the vessel bottom and is preferably connected to this waterproof, for example by a weld.

6 shows a sorting device 60 with a substantially cylindrical housing 61, which is arranged here "lying" with a horizontal rotor axis 62 (rotor not shown). The bottom 63 is planar here, but can also rise to the housing wall, and has a rotor receptacle 64 The passage opening 65 can be provided with a sieve plate (see Figure 1) .A stator ring 66 in the form of a cylindrical tube section is arranged coaxially with the rotor axis 62 on the bottom 63. The stator ring can also be in its height above the base plate The embodiments of the above embodiment may also apply mutatis mutandis.Also, the upper edge 67 of the stator ring in a range of height of the rotor blades from 10% to 90% of the same, In particular, approximately half the height of the same, be arranged .. The distance d between S tatorring and radially outboard region of the rotor can be here, for example, about 100 mm. The height of the stator ring can be about 70 mm.

It is understood that, in general, the stator ring does not necessarily have to be fastened to the bottom of the vessel, even if it preferably extends over its entire circumference up to this, it may optionally also be fastened to the lateral container wall. The stator causes in the inventive device at a given rotational speed of the rotor, the formation of a very stable vortex, which can extend up to the rotor zoom, the power consumption In this case, the rotor drive could be the same or even reduced, in each case in relation to the same operating conditions of an identical device without a stator ring. At the same time, the solids content of fiber material distributed homogeneously in the slurry can thereby easily also amount to 5.5-6% by weight (without consideration of non-homogenized constituents), whereby at the same time the throughput amount of fiber material through the apparatus is increased.

FIG. 7 a shows a non-round stator ring 70 in an oval configuration. FIG. 7b shows a non-round stator ring 71 in a pentagonal configuration. The number of corners of the stator ring may coincide with or be different from the number of ribs 31 arranged radially on the outside of the stator ring. The corners of the stator ring and the ribs can, at least partially, be arranged opposite to each other or offset in the circumferential direction to each other. FIG. 7c shows a non-round stator ring 72 with a multiplicity of stator elements 73 which are arranged in a fan-like manner such that their longitudinal extent is at an angle to a corresponding circular arc 74 centered in the rotor axis.

The central axis of the stator ring may be generally concentric, but may also be arranged acentrically with respect to the rotor axis, wherein both axes are preferably arranged coaxially with one another.

LIPPERT, STACHOW & PARTNER Gu / r 1

PO Box 30 02 08, D-51412 Bergisch Gladbach ^{J - J Unl ZUU}

Telephone +49 (0) 22 04.92 33-0 Fax +49 (0) 22 04.6 26 06

GW Fiber Technology GmbH 42781 Haan

Apparatus for the production or treatment of pulp

LIST OF REFERENCE NUMBERS

11 PPuullppeerr

2 vessel

3 floor

4 rotor

5 drive

6 axis of rotation

7 vessel opening

8 raw material

9 swirls

10 outlet

11 pumping device

12 sorting device

13 water reservoir

13a line

14 drive

15 rotor

16 sieve plate

17 rotor axis of rotation

18 outlet

19 sieve plate

20 outlet

21 connection 22 Processing device

25 stator ring

26 rotor housing

27 stator main axis

28 stator ring wall

29 inclined floor area

30 lower area

31 rib

32 end area

33 rib

35 base plate

36 rotor blades

37 upper edge

38 rotor blades

50 stator ring

51 collar

52 vessel wall

53 wall

54 level area

55 inclined floor area

56 cylindrical stator part

60 sorting device

61 housing

62 rotor axis of rotation

63 floor

64 rotor pick-up

65 passage opening

66 stator ring

67 top edge

70 stator ring

71 stator ring

72 stator ring

73 Statorringelement

74 circular arc d distance

Claims

LIPPERT, STACHOW & PARTNER Gu / r 1RO. Box 30 02 08, D-51412 Bergisch Gladbach 13. June 2007Phone +49 (0) 22 04.92 33-0 Fax +49 (0) 22 04.6 26 06GW Fasertechnik GmbH 42781 HaaπDevice for the preparation or processing of pulp patent claims

1. An apparatus for producing or treating pulp with a substantially cylindrical vessel for receiving the fibrous material of the pulp to be dissolved or processed, wherein on the vessel bottom (3) at least substantially parallel to the ground rotatable rotor (4) is arranged by means of which an aqueous phase in the vessel is set in rapid rotation to produce a slurry of the fibrous material or to treat an existing slurry, and wherein the vessel has an outlet for the pulp, characterized in that the rotor (4 ) is radially surrounded by a stator ring (25, 40).

2. Device according to claim 1, characterized ge kennz e i chnet, that the stator ring (25, 40) is formed as a lanyard through continuous ring or consists of a plurality of annularly arranged individual stator elements.

3. Device according to claim 1 or 2, characterized in that the stator ring (25, 40) tapers at least partially extends in the vertical direction over at least a portion of the height of the rotor.

4. Device according to one of claims 1 to 3, characterized g e ke nn e e c e h e that the rotor (4) projects axially beyond the stator ring (25, 40).

5. Device according to one of claims 1 to 4, dadur ch ge ke n zei chne t that the rotor (4) has a plurality of rotor blades, which are arranged on a rotor base plate, and that the stator ring (25, 40) at least partially protrudes axially over the rotor base plate.

6. Device according to one of claims 1 to 5, dadur ch e ke nn e z e i c hn e t that the height of the stator ring

> 20% and / or <200% of the height of the rotor and / or the rotor blades.

7. Device according to one of claims 1 to 6, characterized ge ke nnzei chn et, that the rotor (4) has a plurality of rotor blades and that the stator ring (25, 40) is formed such that its upper edge in a range of 10-90 % of the height of the rotor blades is arranged.

8. The device according to claim 1, wherein the height of the stator ring is ≥ 25 mm and / or ≦ 250 mm.

9. Device according to one of claims 1 to 8, characterized in that the stator ring (25, 40) has a radial distance of ≥ 50 mm and / or ≤ 500 mm from the rotor (4).

10. Device according to one of claims 1 to 9, since you r ch geke nn zei chn et, that the rotor (4) has a rotor base plate and rotor blades arranged on this and that the base of the stator ring above the lower edge of the rotor base plate or above the lower edge of the rotor blade attaches to the vessel bottom (3).

11. Device according to one of claims 1 to 10, since you rchge ke nn zeic hn et that the bottom (3) of the vessel radially outward of the rotor increases in height and that the stator ring (25, 40) at the level of the rising Region of the vessel bottom or attached to the base of the rising vessel bottom.

12. Device according to one of claims 1 to 10, d a c h e c e s e s that the vessel bottom

(3) has a countersink, which surrounds the rotor (4) with a stepped shoulder, and that the stator ring (25, 40) is arranged radially outwardly of the stepped shoulder.

13. The device according to claim 1, wherein the stator ring (25, 40) has an at least partially encircling collar (41) on the side facing away from the rotor (4).

14. The apparatus of claim 13, since you rchge ke nnzeic hn et that the collar (41) extends to the side lent vessel wall or a portion of the vessel bottom extends whose distance from the stator ring (25, 40) greater than the distance the stator ring of the rotor (4).

15. The device according to one of claims 1 to 14, characterized in that the vessel bottom (3) is designed below the rotor as a sieve, which forms a vessel outlet.

16. Device according to one of claims 1 to 15, since you r ch ge ke nnzeichnet that the vessel bottom (3) is provided with at least one or more substantially radially extending ribs (32) spaced from the stator ring (25, 40) in the radial direction.

17. Device according to one of claims 1 to 16, d a d u r c h e c e in n e c e s that the stator ring is non-round (70-72) executed.

18. Device according to claim 17, characterized in that the stator ring (72) is polygonal.

19. Device according to one of claims 1 to 18, d a c h e c e n e c e s that the vessel as

Pulper is executed.

20. The device according to one of claims 1 to 18, characterized in that the vessel is designed as a sorting machine for separating a particle coarse fraction of the slurry.

21. A process for producing a fiber slurry using a pulpered vessel according to any one of claims 1 to 18, characterized in that the aqueous phase in the vessel contains a sufficient amount of fibrous material to produce a pulp added and the rotor

(4) is operated at a rotational speed such that a fiber slurry having a solids content of fibers homogeneously distributed in the aqueous phase of ≥5% by weight, based on the weight of the slurry without consideration of non-homogeneously distributed substances, results and that the Slurry fed to further operations for producing a fibrous material containing or consisting of the fibers of the slurry or subjected.

A method of making a fiber slurry using a device according to any one of claims 1 to 20, optionally a method according to claim 21, characterized in that, in the presence of a fiber slurry in the vessel, the rotor (4) rotates at a speed of rotation is operated, so that by the rotor (4) in the slurry, a vortex core is generated, which extends up to ≤ 25% of the filling height of the vessel with the rotor resting (4) to this.

23. The method of claim 22, wherein the rotor is operated at a rotational speed such that the vortex core extends to the rotor.