EP1426099A1 - Static mixer - Google Patents

Abstract

Static mixer has mixing elements (47a-47e, 48a, 48b, 49a-49e) having a cross-edge (45) with a cross-guiding wall (55) and two guiding walls (50, 51), which open into separating edges, lateral connecting sections, and a base section arranged between the guiding walls.

Description

The present invention relates to a static Mixer with a bundle of strands according to the generic term of Claim 1. Such a static mixer is known for example from US-A-5 851 067. This patent is again a further development of US-A-5 944 419. In These patents disclose a mixer which is described in chambered strands is divided, the former US patent four chambered strands by four mutually arranged passages arise and the mixer further Has rearrangement chambers. With the second mixer are either two crossing bridges or two intersecting crossing pairs of webs revealed with passages that like this are arranged that each have a bottom section plate an opening comes to rest.

Such mixers achieve better mixing of the Materials based on their length and have one smaller pressure drop than conventional mixers with Mixing coils, but they have relatively large dead spaces, in which the material can harden and clog the mixer.

Starting from this prior art, it is the task of present invention to provide a static mixer the smaller dead spaces at high mixing performance and one has reduced pressure drop. This task comes with the static mixer according to claim 1 solved.

Fig. 1

zeigt schematisch und in perspektivischer Sicht ein erstes Ausführungsbeispiel eines erfindungsgemässen Mischers,

Fig. 2

zeigt schematisch die Ausgangsstellung vor dem Vermischen,

Fig. 3

zeigt ein dazugehöriges Mischschema,

Fig. 4

zeigt ein Ablaufschema beim Vermischen,

Fig. 5

zeigt den Mischer von Figur 1 in umgekehrter Flussrichtung,

Fig. 6

zeigt schematisch die Ausgangsstellung für den Mischer von Figur 5 vor dem Vermischen,

Fig. 7

zeigt ein zu Figur 6 gehöriges Mischschema,

Fig. 8

zeigt ein Ablaufschema zum Mischer von Figur 5 beim Vermischen,

Fig. 9

zeigt schematisch und in perspektivischer Sicht ein zweites Ausführungsbeispiel eines erfindungsgemässen Mischers,

Fig. 10

zeigt die Ausgangsstellung vor dem Vermischen,

Fig. 11

zeigt ein Schema zum Mischer von Figur 9 betreffend Vermischung,

Fig. 12

zeigt ein Ablaufschema beim Vermischen mit dem Mischer gemäss Fig. 9,

Fig. 13

zeigt eine Kombination von erfindungsgemässen Mischelementen mit einer an sich bekannten Mischwendel,

Fig. 14

zeigt ein Detail einer Ausführungsvariante zu Figur 9,

Fig. 15

zeigt schematisch ein weiteres Ausführungsbeispiel eines erfindungsgemässen Mischers,

Fig. 16

zeigt ein Ablaufschema beim Vermischen mit dem Mischer gemäss Fig. 15, und

Fig. 17

zeigt eine Ausschnittvergrösserung des Mischers gemäss Fig. 15.

The invention is explained in more detail below with reference to drawings of exemplary embodiments.

Fig. 1

shows schematically and in perspective a first embodiment of a mixer according to the invention,

Fig. 2

shows schematically the starting position before mixing,

Fig. 3

shows an associated mixing scheme,

Fig. 4

shows a flow chart for mixing,

Fig. 5

shows the mixer of Figure 1 in the reverse flow direction,

Fig. 6

shows schematically the starting position for the mixer of Figure 5 before mixing,

Fig. 7

6 shows a mixing scheme belonging to FIG. 6,

Fig. 8

5 shows a flow diagram for the mixer of FIG. 5 during mixing,

Fig. 9

shows schematically and in perspective a second embodiment of a mixer according to the invention,

Fig. 10

shows the starting position before mixing,

Fig. 11

9 shows a diagram for the mixer of FIG. 9 regarding mixing,

Fig. 12

shows a flow diagram for mixing with the mixer according to FIG. 9,

Fig. 13

shows a combination of mixing elements according to the invention with a mixing helix known per se,

Fig. 14

shows a detail of a variant of FIG. 9,

Fig. 15

schematically shows a further embodiment of a mixer according to the invention,

Fig. 16

shows a flow chart for mixing with the mixer according to FIG. 15, and

Fig. 17

shows an enlarged section of the mixer according to FIG. 15.

1 shows a section from a first Embodiment of a mixer 1 according to the invention, the has a number of identical mixing elements 2, 2 'and 2 ", each rotated by 180 ° with respect to the longitudinal axis are arranged one on top of the other. At one end it is Mixer housing 3 indicated.

The single mixing element 2 has at one end, in Flow direction seen, i.e. in the drawing from below, a transverse edge 8 on a transverse baffle 8 'on perpendicular to it two end sections 6 and 7 with the complementary side openings 11 and 12 and a Bottom section 9 and complementary bottom section opening 10 connect, the latter between two guide walls 4 ', 5' are located, each opening into a separating edge 4, 5 and here are aligned parallel to the longitudinal central axis. In In the present example, the End sections over half of the dividing edges. The openings, or their cross section, determine with the Lengths of the webs essentially the pressure drop from the beginning until the end of the mixer.

The mixing element 2 'following the mixing element 2 has same parts and structures, but is rotated 180 ° with respect to the longitudinal axis above the first Mixing element 2 arranged. The following mixing elements are also identical to the mixing element 2 and each seen in the longitudinal direction rotated by 180 ° in a row arranged. The direction of flow is indicated by an arrow 13 indicated.

2 shows the distribution of the two components G and H specified at the mixer input, with each component off a container of a double cartridge or one Discharge device comes, which have separate outlets, see Figure 13. In the present example is the mixer input drawn in according to the flow direction below. When entering of the two components G and H on both sides of the transverse edge 8 ' each component spreads along the transverse baffle 8 ' and are divided into three strands by the guide walls 4 ', 5' divided, so that finally six strands AG, BG, CG as well AH, BH and CH arise, these strands each in the mixer a chamber DG, EG, FG; DH, EH, FH can be assigned.

With further discharge, the six strands come to next mixing element 2 '. On the one hand the transverse edge the mixed and spread strands AG, BG and CG through the side openings 11 and 12 are displaced and on the other side of the transverse edge Spread strands AH, BH, CH through the bottom opening 10 displaced through, as indicated schematically in Fig. 3 is. This results in the end of element 2 mixed strands A1.G and C1.G with B1.G and A1.H and C1.H with B1.H = A1.1 and C1.1 with B1.1 and A1.2 and C1.2 with B1.2 according to the scheme of Figure 3. After hitting the second mixing element 2 'spread the mixed Strands on both sides of the transverse edge.

Then the mixed and spread strands A2.1, B2.1, and C2.1 out through the side openings 11 and 12 displaced through and the mixed strands A2.2, B2.2 and C2.2 inwards through the bottom opening 10 displaces, as can be seen from Figure 3, after which spread these strands again.

The next step is to push them into the other Direction, i.e. Strands A3.1, B3.1 and C3.1 are turned inside and A3.2, B3.2 and C3.2 displaced outward, like this also emerges from Fig. 3. Again spread at Entry into the next element the components each both halves of the transverse edge, then displaced again to become and get to the next mixing element.

The arrangement and design of the mixing elements results a three-part process of the mixing process, in which the Mass first divided, then spread out and then displaced is then divided again in the next step, to be spread and displaced.

This can be seen from the diagram in Fig. 4, in which the three Steps of dividing, displacing and spreading in three stages is shown. In the diagram of FIG. 4, I is under Divide, II the displacement and III the spread symbolizes while the three mixing elements and also Mixing stages with 2, 2 ', 2' 'are designated. For this The diagram clearly shows that in mixing element 2 the two components G and H first in two then in each three, i.e. in six strands AG, BG, CG, and AH, BH, GH be divided, then three mixed on one side Strands through the two side openings as two Strands are displaced and on the other hand the other three mixed strands in one strand through the Bottom opening 10 are displaced and then each as three mixed strands spread out.

In a variant for a larger mixer more than two dividing edges and baffles can be provided be, e.g. three dividing edges and baffles that more than result in six strands, the bottoms or openings are arranged alternately or offset. As with the previous example is a transverse edge present so that the strands are split into two become. The result is an analog picture for a Mixing element with more than one transverse edge and more than two Partitions.

It is also possible to adjust the mixer with respect to the flow direction to operate in the reverse position and thus the material not first on the transverse edge but first on the To let separating edges hit. This will make the crowd first in three parts and then, passing through the two Openings divided into two parts. In this reverse The two outer strands unite in the direction of flow and spread out on one half of the transverse edge and that the two middle strands unite and spread on the other half of the transverse edge.

In Figures 5 to 8 the mixer 1 is in relation to Figure 1 - with the same direction of flow - drawn reversed by 180 °. For better understanding, the individual parts of the Mixing element listed again. The individual Mixing element 2 has at one end, in the direction of seen below, two separating edges 4 and 5, each in one Baffle 4 ', 5', here parallel to the longitudinal central axis are aligned and perpendicular to it, on both sides of the guide walls, two end sections 6 and 7 and have a bottom portion 9 which is between the Guide walls are located and over half of the guide walls extends. Perpendicular to the closing sections in the A transverse guide wall 8 'is arranged in the middle of the guide walls, a transverse edge 8 at the other end of the mixing element having.

To the two end sections and the bottom section complementary include the bottom section opening 10 between the guide walls and the two side openings 11 and 12 on both sides of the guide walls. The openings, or their Cross section, essentially determine the pressure drop from Start to end of the mixer.

The mixing element 2 'following the mixing element 2 has same parts and structures and is related the longitudinal axis turned 180 ° above the first mixing element 2 arranged. The following mixing elements are also with respect to the longitudinal axis by 180 ° arranged one behind the other. The direction of flow is with arrow 13 indicated.

5 shows the distribution of the two components G and H specified at the mixer input, with each component off a container of a double cartridge or one Discharge device comes, which have separate outlets, see Figure 13. In the present example is the mixer input drawn in according to the flow direction below. When entering of the two components in the first mixing element 2 through the separating edges 4 and 5 into the six strands AG, BG, CG and AH, BH and CH divided.

With further discharge, the six strands come to next mixing element 2 '. The two of them Strands A1.G with A1.H and B1.G with B1.H and C1.G with C1.H = A1.1 with A1.2, B1.1 with B1.2 and C1.1 with C1.2 according to the figure 7 mixed together, whereby, due to the geometric Structure of mixing element 2 strand A1.1 strand A1.2 displaced and through side opening 11 through to the next Mixing element arrives, strand B1.2 displaces strand B1.1 and through the bottom section opening 10 to the next Mixing element arrives and line C1.1 displaces line C1.2 and through the side opening 12 to the next Mixing element arrives. When hitting the second Mixing element 2 'spread the mixed strands B2.1 and B2.2 on one side of transverse edge 8 on the whole Half A2.1 - B2.1 - C2.1 and the same spread the two mixed strands A2.1, A2.2 and C2.1, C2.2 the other side of transverse edge 8 on the in the figure front half of A2.2, B2.2 and C2.2.

The next step is to push them into the other Direction, i.e. Strand B2.1 displaces strand B2.2, strand A2.2 displaces strand A2.1 and strand C2.2 displaces strand C2.1, as can also be seen in FIG. 3. In turn spread out when entering the next mixing element Components each on a half, then again to be displaced and to the next mixing element reach.

The arrangement and design of the mixing elements results here also a three-part sequence of the mixing process, in which the mass is first divided and then displaced and finally spreads out, then in the next step to be divided, repressed and spread out again.

This can be seen from the diagram in Fig. 8, in which the three Steps of dividing, displacing and spreading in three stages is shown. In the diagram of FIG. 8, under I that Divide, II the displacement and III the spread symbolizes while the three mixing elements and also Mixing stages with 2, 2 ', 2' 'are designated. For this The diagram clearly shows that in mixing element 2 the then split both components into six strands one strand at a time displaced the other, afterwards spread to the second mixing element 2 'in such a way that the middle strands are half on one side of the Cross edge 8 and transverse baffle 8 'and the two outer String pairs together the other half on the other side form the transverse edge and transverse baffle.

The mixers described above do not result in only one good mixing of the materials, but above all a lower pressure drop and less dead space in the Comparison to other mixers mentioned at the beginning.

Proceeding from these simplified schematic representations Mixing processes result in possible variations: In these embodiments, mixers were used rectangular or square cross-section described and the two impinging components have the same Cross-section. However, this does not always have to be the case any cross-sectional or Volume flow ratio of the two components G and H can be selected, for example between 1: 1 to 1:10, during the dimensions of the mixing elements remain the same. It is however also possible, specially adapted mixing elements provided. This means that the transverse edge is not in the Center line of the mixing element must be arranged. The the same also applies to the distance between the separating edges and guide walls.

In addition, the dividing edges and guide walls can be combined in one Angles can be arranged to each other and the same can End sections and the bottom section as well as the The transverse edges each have an angle to one another, so that the openings do not have to be rectangular or square. Edges, for example the transverse edge, can also bend exhibit. The mixing elements must be in relation to the longitudinal axis not rotated 180 ° to each other in a row be arranged, any angle from 0 ° - 360 ° possible.

It is also possible to use the ones described so far Mixing elements in a housing with other than rectangular Cross section, e.g. in a round, circular, conical or elliptical housing.

While the mixing elements described so far are good Have mixing properties, they point at an angle walls facing each other also in the improved Execution still dead spaces that give rise to hardened Give material. The further reduction of the dead space can through a mixer with mixing elements with curved walls respectively. Such a mixer is shown in FIGS. 9 to 12 shown.

In Fig. 9 is a mixer 14 with a cylindrical housing as a special case of a mixer with mixing elements with shown curved walls, with the mixing elements 15, 15 'and 15' 'and the housing 16. In analogy to the first Mixer 1 contains the mixing element 15 at one end, in Flow direction seen below, a transverse edge 21, of the two Guide walls 17 ', 18' extend into a separating edge 17, 18 mouth. The guide walls each contain one End section 19 and 20 with the side openings 24, 25, a bottom section 22 and a complementary bottom opening 23rd

The individual sections are not so clear here delimited as in the first embodiment. In Deviation from the rectangular mixing element 2 go the two Baffles 17 '18' of those at one end Separating edges 17 and 18 curved and continuous to other end into the transverse edge 21. This crooked Training of the guide walls, or their transition into the The transverse edge is shown in FIG. 9, the schematic one Transition is shown in Figure 12.

The operation of this second embodiment is the same as in the first example. In analogy to this, the strand of material consisting of two components G and H. in a total of six strands AG, BG, CG, AH, BH and CH divided when he leaves the first mixing element 15.

The mixing in this example takes place in analogy to first embodiment, the guide walls no longer stand sharp and at right angles to each other, but V-shaped converge and have a curved shape. While the mixing principle shown in Figure 11 is the same as the first example, i.e. that the middle strand BG = B1.1 in Fig. 11 with the two other strands AG = A1.1 in Fig. 11 and CG = C1.1 in Fig. 11 mixed, through the side openings 24, 25 through is displaced and spreads and on the other side the two outer strands AH = A1.2 and CH = C1.2 mix with the middle strand BH = B1.2, are displaced through the bottom opening 23 and themselves spread, etc. Due to the curved design and the V-shaped the dead spaces become essential reduced, so that there are lower losses. On the other hand, this arrangement also results in a lower pressure drop.

It is conceivable in this embodiment that the two guide walls 17 ', 18' at the transition to the transverse wall 21 one arranged in the longitudinal axis and transversely to the transverse wall Have additional web 152, the exit on the transverse wall theoretically divides the material into three, not two, see Figure 14 with a mixing element 151. Such However, additional bridge does not bring any advantage, but rather that Disadvantage that the material on this page is not can spread. It would also be possible to have such a footbridge To be attached to the first square mixer, i.e. below the Bottom 9 along the transverse edge 8. The further considerations and the claims, however, take this additional web into account Not.

The scheme according to FIG. 12 is also analogous to the scheme of Fig. 4, with the difference that the at Fig. 4 existing, vertical guide walls 4 ', 5' here V-shaped are trained and pass into the transverse edge.

Analogous to the first example, the cross sections or Volume flow ratios of materials G and H of 1: 1 be different, and above all, the baffles can differ from the Separating edges to the transverse edge a variety of geometric Take forms as well as the mixing elements regarding the Flow direction also reversed as the arrangement shown his. The mixing principle is always maintained that the middle strands mix and mix on one Spread out the side of the transverse edge and the two outer ones String pairs are then each on the other side of the transverse edge spread. Also, not everyone needs it following mixing element with respect to the longitudinal axis by 180 ° to be rotated as shown in Figure 9, but can be arranged in any orientation.

In the embodiment of Figure 13 is a new one Mixer assembly shown using the mixing elements described yields particularly good values. The mixer housing 16 of the mixer 36 from FIG Mixer entrance with inlets 32 and 33 and Outlet openings 34 and 35 can be seen. Like the known mixers with mixing spirals is the leading edge 31 of the first mixing spiral element 28 across the two Outlet openings 34, 35 arranged. The two separating edges of the first mixing element 15 of the first mixing group 27 transverse to the trailing edge 30 of the first mixing coil element arranged.

The first mixing group 27 consists of the mixing elements 15, where four mixing elements are shown here, for example are. This is followed by the second mixing spiral element 28 ', the a second mixing group 27 'follows. This second mixed group also consists of four mixing elements 15 ', however compared to the first mixing group with regard to the direction of flow are turned through 180 °, i.e. with the against the entrance directed transverse wall, which makes this group look similar to that according to FIG. 9.

FIG. 13 also shows that the transverse edge 21 of the last mixing element of the mixing group perpendicular to each Leading edge 31 'of the mixing coil element 28' is. The periodic use of a mixing spiral element has the Purpose of efficiently peeling the material from the walls and reallocate this, thereby further improving the Mixing performance takes place.

In Figure 13 there are three mixing groups and three mixing coil elements shown, but it is obvious that the number of mixing groups and mixing spiral elements depending on Can change purpose. Both the number Mixing elements per mixing group as well as the mixing spiral elements vary between the mixing groups. All Mixing Considerations and Use conventional mixing coils also apply to that Homogenize materials and for mixed arrangements with Mixing elements according to FIG. 15.

The exemplary embodiment according to FIGS. 15-17 is based on Embodiment according to Figure 1 with straight element walls from, however, the mixing elements in one circular cylindrical housing are arranged. In this Several features are given the embodiment improve mixing as well as dead zones, or reduce their losses and thus significantly enable higher total efficiency. You don't have to all of these features simultaneously on all mixing elements or mixed groups.

FIG. 15 shows a mixing element arrangement 40, the Housing is not shown, with the inlet part 41 with the Inlets 42, 43 and the exits 42 ', 43' and the Mixing part 44 with the mixing elements. Until the first Transverse edge 45 are the components by means of a separating web 46 Cut. In this embodiment, there are five Mixing elements 47a-47e in a first mixing group 47 summarized, while the second mixing group 48 two Mixing elements 48a and 48b and the further mixing group 49 again comprises five mixing elements 49a - 49e.

When using the mixer according to Figures 1, 15 or 17 it may be advantageous that the after the transverse wall flow through guide walls 50, 51 a greater height ZL have as the height ZQ of the transverse baffles, z. B. preferred with a factor between 1.1 - 2.0, especially 1.5. This Extending the double guide walls results in a better one Orientation of the material, which gives it more time spread out before it is divided again. The Extension of the double guide walls also causes one Reduction in the number of mixing elements required to to achieve an equal or better mixing quality.

When using the mixer according to Figure 5, i.e. in reverse flow direction, it can be beneficial that to design higher transverse wall through the guide walls than the guide walls, the height ZQ 1.1 also being preferred here can be up to 2.0 times greater than the height ZL of the guide walls, especially 1.5 times.

A second feature that is common to all mixing elements Measures to reduce dead zones, in particular play a role in straight walls and lead to loss volumes and local curing. Such dead zones become filled. In particular, there are various ones in FIG Dead zone closures TZV specified. So the Bottom section 9 a first type of Dead zone locks TZV1 on to the previous one Mixing element are directed. The mixing elements that have no sloping webs, i.e. the mixing elements 47a - 47 e and 49a - 49e, face on the inside facing sides the bottom sections also dead zone closings TZV2 on. The guide walls 50 and 51 have a third and outside fourth type of dead zone locks TZV3 and TV4, which are attached where there are no sloping bars are.

In the case of straight walls, wall layers are formed, which in the Strand formation cause faulty layers. For replacement such layers and to support longitudinal mixing towards the double baffles and to balance the Concentrations are used, inclined bars, the inside and Are attached to the outside of the guide walls.

These inclined webs are on in the mixer of FIGS. 15 and 17 the middle mixing group 48 attached and there are inner inclined webs 52 and external inclined webs 53 can be seen both on the guide walls 50 and 51 of the mixing elements 48a and 48b are attached.

Wall layers are created not only on the guide walls but also also on the inside wall of the mixer housing. For optimization of the layer formation, longitudinal webs are attached, which connect the double guide walls outside. These longitudinal webs do not have to be present in all mixed groups. in the Embodiment according to Figures 15 and 17 are Longitudinal webs 54 on the first and second mixing groups 47, 48 attached, but these could also be on the third or any other mixing group, or alternatively as for mixing group 48.

The proposed measures or features will preferably used with each other, but are also designs conceivable in which only individual measures apply Find.

In Figure 16 is the flow chart for mixing shown.

In A the two components spread on the respective one Half of the transverse guide wall 55. At B the right part goes in the middle and spreads the entire length of the Baffles 50, 51 from, while the left part in two Divides halves and forms the outer two thirds. At C these three streams are divided across. At D the left one Half directed in the middle and spread over the whole Length of the baffles while dividing the right half and half on either side of the Baffles, whereupon a transverse edge follows again, etc.

The following claims apply to the simplified Case that the transverse edges and guide walls are no webs like web 152 have the general mixing principle of Do not change mixing elements. In addition, any falls Doubling the transverse edge in two parallel transverse walls below the definition of a transverse wall as this is the mixing principle also does not change.

Claims (20)

Static mixer with mixing elements for dividing the material to be mixed into several strands and means for layering the same, with a transverse edge and guide walls running at an angle to the transverse edge, and guide elements with openings arranged at an angle to the longitudinal axis, characterized in that the mixing element ( 47a-47e; 48a, 48b; 49a-49e) a transverse edge (45) with an adjoining transverse guide wall (55) and at least two guide walls (50, 51) which open into separating edges (4, 5) with lateral end sections (6 , 7; 19, 20) and at least one bottom section (9, 22) arranged between the guide walls, which has at least one opening (10, 23) on one side of the transverse edge (8, 21) and at least two openings (11, 12 ; 24, 25) on the other side of the transverse edge. Static mixer with mixing elements for dividing the material to be mixed into several strands and means for layering the same, with separating edges and a transverse edge running at an angle to the separating edges and guide elements with openings arranged at an angle to the longitudinal axis, characterized in that the mixing element ( 2, 2 ', 2 "; 15, 15', 15") at least two separating edges (4, 5; 17, 18) with adjoining guide walls (8 ', 21') with lateral end sections (6, 7; 19, 20 ) and at least one bottom section (9, 22) arranged between the separating edges and a transverse edge (8, 21) arranged at the end of a transverse guide wall (8 ', 21'), which has at least one opening (10, 23) on one side of the Define the transverse edge (8, 21) and at least two openings (11, 12; 24, 25) on the other side of the transverse edge. Mixer according to claim 1 or 2, characterized in that the sections of the guide walls are flat and arranged at an angle to one another. Mixer according to one of claims 1 to 3, characterized in that the mixer housing (3) has a round cross section. Mixer according to one of claims 1 to 3, characterized in that the mixer housing (3) has a rectangular cross section, the at least two separating edges (4, 5) with the adjoining guide walls (4 ', 5') at right angles to at least one transverse edge (8 ) with the transverse guide wall (8 ') and the lateral end sections (6, 7) and the bottom section (9) are arranged perpendicular to the guide walls. Mixer according to claim 1 or 2, characterized in that the guide walls are curved, the at least two guide walls (17 ', 18') with the separating edges (17, 18) at one end of the mixing element in a transverse edge arranged at the other end of the mixing element (21) pass over Mixer according to claim 6, characterized in that the mixer housing (16) is round and the mixing element (15, 15 ', 15 ") at least two separating edges (17, 18) and a transverse edge (21) with connecting guide walls (17' 18 ') ) with two lateral end sections (19, 20) and at least one bottom section (22), the connecting guide walls being curved and continuously merging into the transverse edge from the separating edges. Mixer according to one of claims 1 to 7, characterized in that the successive mixing elements (2, 2 ', 2 "; 15, 15', 15") are each rotated with respect to the longitudinal axis. Mixer according to claim 8, characterized in that the successive mixing elements are rotated by 180 ° with respect to the longitudinal axis. Static mixer with mixing elements for dividing the material to be mixed into several strands and means for layering the same, with separating edges and a transverse edge running at an angle to the separating edges and guide elements with openings arranged at an angle to the longitudinal axis, characterized in that the mixer mixing groups (27, 29) with mixing elements for subdivision into several strands and at least one shifting element (28, 28 ', 28'') is arranged between the mixing groups. Mixer according to claim 10 and one of claims 7-9, characterized in that the mixer successively contains a first mixing group (27) with mixing elements (15), which is followed by a redirecting element (28) and which in turn is followed by a second mixing group (29 ) followed, etc., the leading edge (31) of the shifting element being substantially perpendicular to the transverse edge (21) of the last mixing element of the mixing group and the second mixing group being arranged so as to be turned through 180 ° with respect to the direction of flow such that the transverse edge (21) of the mixing element (15) is substantially perpendicular to the trailing edge (30) of the shifting element. Mixer according to claim 1, characterized in that the height (ZL) of the guide walls (50, 51) is greater than the height (ZQ) of the transverse guide wall (55). Mixer according to claim 2, characterized in that the height (ZQ) of the transverse guide wall (55) is greater than the height (ZL) of the guide walls (50, 51). Mixer according to claim 12, characterized in that (ZL) = 1.1 - 2.0 (ZQ), preferably 1.5 (ZQ). Mixer according to claim 13, characterized in that (ZQ) = 1.1 - 2.0 (ZL), preferably 1.5 (ZL). Mixer according to claim 12 or 13, characterized in that the guide walls (50, 51) have inclined webs (52, 53) on the inside and / or outside. Mixer according to one of claims 12 to 16, characterized in that longitudinal webs (54) are arranged between the guide walls of two adjacent mixing elements. Mixer according to one of claims 2, 12, 13 to 17, characterized in that the bottom sections (9) and the guide walls (50, 51) are provided with dead zone closures (TZV1, TZV2, TZV3, TZV4). Use of the mixer according to one of claims 1, 7 to 18 in the event that the material first hits the transverse edge, characterized in that the mixing element (2, 2 ', 2 "; 15, 15', 15") is formed to divide the strand of material into at least two strands (G, H) in order to divide the two strands at the exit into at least six strands (AG, BG, CG, AH, BH, CH), with two mixed strands (BG with AG and CG) is passed to one side of the transverse wall (8) and a mixed strand (AH and CH with BH) to the other side of the transverse wall (8). Use of the mixer according to claim 2, 7 to 18 in the event that the material first meets the separating edges (4, 5, 17, 18) and guide walls (4 ', 5'; 17 ', 18'), characterized in that that the mixing element (2, 2 ', 2 "; 15, 15', 15") is designed to subdivide the strand of material into at least six strands (AG, BG, CG, AH, BH, CH), each with a part of strands (BG, BH) to one side of the transverse edge (8, 21) and the other part of the strands (AG, AH, CG, CH) to the other side of the transverse edge.

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