EP1149626B1 - Static mixing element and static mixer and use thereof - Google Patents

Abstract

Static mixing element (1) comprises a tubular mixer channel (2) with an inner wall forming an outer limit of the cross-section through which material is able to flow; and mixing paddles (4a, 4b). At least two of the paddles are arranged axially behind each other in the mixer channel. At least one mixing paddle located in the flow direction is connected to the inner wall to transfer forces acting in the axial direction from the mixing paddle to the mixer channel. AN Independent claim is also included for a mixer paddle element (3) for arranging in a tubular mixer channel. Preferred Features: Additional elements are also present for effecting form closure between the mixing paddles and the mixer channel.

Description

The present invention relates to a static mixing element according to the preamble of Claim 1, a static mixer according to the preamble of claim 24 and the use thereof according to claim 26.

Static mixing elements or static mixers come in general then apply if two or more Streams of flowable materials to a substantially homogeneous stream should be mixed.

From the field of adhesive chemistry are Disposable static mixer for two-component adhesives known, which consists of a plastic tube with a loose inserted one-piece mixing unit made of plastic with trained as swirl blades mixer wings consist. The mixer blades are in the center of the mixing unit connected together and form a coherent Mixer blade element, which is located in the plastic tube with the last axially in the flow direction arranged mixer wings on an axial shoulder in Area of the outlet supported in the mixer tube. While Static mixer of this type for mixing low-viscosity Substances at medium throughputs good mixing results are the mixed results at the Mixing of highly viscous substances or at high substance throughputs not satisfactory.

It is therefore the task, a static mixing element, as well as, one Static mixer for To provide, which the aforementioned disadvantages of the prior art do not have and at the same time are inexpensive to manufacture.

This task is performed by the static mixing element and the Static mixer according to solved independent claims.

In a first aspect of the invention the static mixing element is a substantially tubular Mixer channel on, in the axial direction is undivided, but of several radial sections can exist. The inner wall of the mixer channel forms in the radial direction outer boundary of the from mixing well flowed cross-section. Furthermore has the static mixing element radially to the inner wall the mixer channel adjoining mixer blades, preferably as one or more of the mixer channel separate moldings are formed and of which at least two axially behind the other in the mixer channel are arranged. Mixer channel and mixer blades are so in a preferred embodiment separate elements, i.e. not integrally formed with each other. At least a mixer wing that extends in the direction of flow axially in front of a in flow direction axially last arranged mixer blades, or with others In words expressed in the flow direction on the penultimate or earlier axial position in the Mixer channel is located in the area in which he radially to the inner wall of the mixer channel adjacent, connected to the inner wall and indeed such, that a transmission of acting in the axial direction Forces from this mixer wing to the mixer channel is possible. This connection, which by traction will be produced, leads to a stabilization of the axial position the mixer wing in the mixer inlet area.

As already stated, forms the Inner wall of the mixer channel in the radial direction outer boundary of the cross-section to be flowed through. It encloses this and is in contact with a large area with the substances flowing through it. The inner contour of the Mixer channel is tubular and preferably has a substantially round and especially one circular cross-section on. Below essentially round Cross sections are understood here as cross-sectional shapes, which is a formation of dead corners when flowing through oppose, such as oval cross sections or through Polygons approximate round, oval or similar cross sections. If a non-circular cross-section is chosen, so can with uniform axial mixer wing or Swirl wing division provided a mixing element be in which the flow is alternately accelerated and slowing down again, resulting in certain applications in addition to an improved mixing result can. In addition to the aforementioned cross-sectional shapes are but also mixer channels with essentially angular Cross sections and in particular with square Cross sections provided. Especially in the case that the mixer blades as simple turbulence wings across the Direction of flow of the mixing element in the mixer channel are formed, such a configuration Have advantages.

Under an undivided in the axial direction Mixer channel is understood to be a mixer channel whose Inner wall at a given radial position via their entire axial extent of a one-piece Component is formed. In other words, that means Although this mixer channel from several radial Sections (e.g., two half-shells), each of which extends over its entire length, but not out can be formed of several axial sections.

In a preferred embodiment is or are at least one or the other in the flow direction axially first position arranged or arranged mixer blades, So the one or the entrance to the actual Mischerkanals located or located Mixer blades, with the inner wall of the mixer channel connected. Surprisingly, it has been shown that a stabilization of the axial position of the mixer blades in the area of adjoining the inner wall of the Mischerkanals and especially in the area of entry of the from the mixer blades formed flow channel significantly improved mixing results during mixing highly viscous substances or at high substance throughputs leads. Because the correct axial position of the Mixer blades especially in the inlet area of the mixing element essential for the mixing result In particular, these benefits appear to be the case very long mixing elements with a variety in axial Direction of successively arranged mixer blades clearly to day. In such mixing elements is the possible axial mispositioning in the flow direction first arranged wings at a deformation of the Mixer blade element due to flow forces extraordinary big.

In a further preferred embodiment at least two arranged in the axial direction one behind the other Mixer blades in the area in which this radially adjoin the inner wall of the mixer channel, connected to the inner wall, resulting in a good Stability of the mixer geometry even with large at the Mixer blades attacking flow forces leads, as these are supported in the axial direction of the mixer channel. It is particularly advantageous for stability, though In addition, arranged in the axial direction one behind the other Mixer blades and / or on the same axial Position located mixer blades connected to each other are. Especially if these are in the area of the center of the Mixer channels are interconnected, arise together with the connection of mixer blades with the Inner wall of the mixer channel extremely dimensionally stable Mixing elements.

Preferably, at least two form Mixer blades a coherent mixer blade element, which benefits by common one-piece training the mixer wing takes place. In this case arises Mixing element with a simple construction of a few, cost-effective manufacturable components. But it is the same conceivable, individual mixer blades to a mixer wing element zusammenzustecken or stick together. Such Mixer blade element can, for example, at least two mixer blades arranged at the same axial position However, it preferably has at least two arranged one behind the other in the axial direction Mixer blades, which e.g. in the area of the center of the element are interconnected.

Also preferred are embodiments in which arranged in the axial direction one behind the other Mixer blades of the mixer blade element in the area which adjoins the inner wall of the mixer channel, through Support webs are interconnected. This connection can be formed integrally, for example, by the interconnected mixer wings and the bars form a one-piece injection molded part. It is, however also conceivable embodiments in which individual webs are attached between the mixer blades or where on the mixer wings located web-like training axially support one another.

Another preferred embodiment of Mixing element has at least two mixer blade elements on, and preferably at least two axially successively arranged in the mixer channel mixer blade elements. However, it is also conceivable, individual Mixer vanes side by side in the mixer duct to arrange and a combination of the two arrangement options to use. In the described way and Manner can be with a few standardized mixer wing elements Mixing elements of different lengths respectively. with a different number of mixer stages put together and manufacturing problems overcome the production of the mixer wing elements.

In a preferred embodiment, the or are they with the inner wall of the mixer channel associated mixer blades or is or are the Mixer blade elements via positive locking in axial Direction connected to the mixer channel. This is with Advantage achieved by the outer contour of the Mixer blades or mixer blade elements and the inner wall the mixer channel a bayonet-type or a forming a thread-like connection, a form fit by engaging or engaging projections in one or more depressions between them or additional elements, e.g. Radial pins, to Effecting the positive connection between the mixer blades or the mixer blade element and the inner wall of the Mixer channels are used. Become mixer wing elements with in an outer area by supporting webs used interconnected mixer wings, so These webs can be used in radial depressions in the Be arranged inner wall of the mixer channel, which especially useful if the support bars Means for effecting an axial positive connection with the Have mixer channel.

They are also combinations conceivable together with a form fit, e.g. Mixer blade elements with resilient sheet steel wings, which themselves against the direction of flow in a mixer channel e.g. made of plastic under resilient inclination of the Insert mixer blades and then join Load by flow forces in the direction of flow brace against the inner wall of the mixer channel. With increasing axial forces in the direction of flow increases also the radial spreading force, so that the sharp-edged steel wing downright in the relative soft inner wall of the mixer channel clawed.

Advantageously, the mixer blades as Swirl wings formed, i. they are so shaped, that the good to be mixed when flowing through the area of the mixer wing affected by this Flow channel in rotation offset around an axis becomes. It is particularly preferred if axially one behind the other arranged swirl wings an opposite Have twisting direction.

It goes without saying that different not explicitly mentioned combinations such as e.g. the Use of supporting webs in which to the inner wall of Mixer channels adjacent area of the mixer wing element together with a bonding of the same with the Inner wall of the mixer channel and / or using an axially positive connection with the mixer channel possible are.

In a further aspect of the invention the static mixing element a substantially tubular mixer channel integral with its Inner wall trained mixer wings on, the off is formed a plurality of radial sections. The cross section the mixer channel can have the same cross-sectional shapes have as in the mixing element shown above.

Preferably, the mixer channel consists of two half-shells, which advantageously each have at least two mixer blades.

In a preferred embodiment of this Mischelements protrude the mixer blades at least one Radial section of the mixer channel over that of the radial joints of the same formed dividing plane out. This gives, for example, the possibility Overlaps between mixer wings two as Half shells executed mixer channel sections too achieve.

Advantageously, one behind the other in the axial direction arranged mixer wings and / or up same axial position located mixer blades interconnected for transmission of in axial Directional forces on each other. This connection is advantageous in the area of the center of the mixer channel realized. Should the one after the other in axial position lying mixer blades of a radial portion of the Mixer channels are connected together, so it is from Advantage, this in the area of the center of the mixer channel integral with each other, e.g. through a central jetty. Should, however, the mixer blades of at least two radial sections of the mixer channel be joined together, so it is preferred this in the area of the center of the mixer channel by positive locking to connect with each other, for example in shape of interlocking and mixer wing tips formed tines.

Also in this static mixing element the mixer blades are advantageously designed as swirl vanes, wherein preferably axially behind one another arranged swirl wings an opposite twisting direction exhibit. Furthermore, it is preferred that to produce static mixing element made of plastic and in particular, this by injection molding of plastic manufacture.

In a further preferred embodiment the mixer blades and / or the mixer channel made of plastic produced, which is advantageous in the injection molding process he follows.

In another aspect of the invention a static mixer at least one static mixing element of the type described above.

In a final aspect of the invention the described mixing elements, the described static mixer for mixing highly viscous substances, preferably for mixing of highly viscous PU (polyurethane) with Curing accelerators.

Fig. 1 eine teilweise geschnittene Darstellung eines statischen Mischelements mit radial geteiltem Mischerkanal;

Fig. 2a eine Draufsicht in Durchströmungsrichtung auf das statische Mischelement von Fig. 1;

Fig. 2b eine Draufsicht in Durchströmungsrichtung auf ein statisches Mischelement ähnlich dem von Fig. 1 mit nicht kreisrundem Mischerkanalquerschnitt;

Fig. 3 eine teilweise geschnittene Darstellung eines anderen statischen Mischelements mit radial geteiltem Mischerkanal;

Fig. 4 eine teilweise geschnittene Darstellung eines statischen Mischelements mit einstückigem Mischerkanal;

Fig. 5 eine teilweise geschnittene Darstellung eines weiteren statischen Mischelements mit einstückigem Mischerkanal;

Fig. 6 eine teilweise geschnittene Darstellung noch eines weiteren statischen Mischelements mit einstückigem Mischerkanal;

Fig. 7 eine teilweise geschnittene Darstellung eines Statikmischers mit dem statischen Mischelement aus Fig. 1; und

Fig. 8 eine Seitenansicht eines Mischerflügelelements mit im äusseren Bereich zwischen den Mischerflügeln angeordneten Stützstegen.

Further preferred embodiments of the invention will become apparent from the dependent claims and from the following description with reference to FIGS. Showing:

Figure 1 is a partially sectioned view of a static mixing element with radially split mixer channel.

FIG. 2a is a plan view in the direction of flow on the static mixing element of FIG. 1; FIG.

2b is a plan view in the direction of flow on a static mixing element similar to that of Figure 1 with non-circular mixer channel cross-section ..;

Fig. 3 is a partially sectioned view of another static mixing element with radially split mixer channel;

4 shows a partially sectioned illustration of a static mixing element with one-piece mixer channel;

Fig. 5 is a partially sectioned view of another static mixing element with one-piece mixer channel;

Fig. 6 is a partially sectioned view of yet another static mixing element with integral mixing duct;

Fig. 7 is a partially sectioned view of a static mixer with the static mixing element of Fig. 1; and

Fig. 8 is a side view of a mixer blade element with arranged in the outer region between the mixer blades supporting webs.

The basic principle of a preferred embodiment the invention is shown in Fig. 1. This in partial section illustrated static mixing element 1 consists of a mixer channel 2 of two half-shells 2a, 2b (in Section shown) and arranged in this one Mixer blade element 3 (shown uncut) with a plurality of each other in one piece with each other connected and designed as a swirl blades mixer wings 4a, 4A, 4b, 4B, which side by side and in Flow direction D arranged axially one behind the other are and wherein the axially arranged one behind the other Mixer blades 4a, 4b and 4A, 4B, a reverse twisting direction exhibit. The mixer wing elements used here are used as plastic injection molded parts in large Quantities produced and are commercially available. As seen from the top view in the flow direction D on the mixing element 1 in Fig. 2a will be apparent each at an axial position two mixer blades 4a, 4A, the mixer blade pairs 4a and 4A, 4b and 4B, and their ramps by a web 5a from each other are separated. For the sake of universal Usability are as shown in this example commercially available mixer blade elements 3 in both axial directions an identical geometry on, which is why the backs of the mixer wing pairs 4a and 4A, 4b and 4B also have ramps, which by a Bridge 5b are separated. This web 5b is opposite to the Ridge 5a on the front of the mixer wing pairs 4a and 4A, 4B and 4B around the extension angle of the mixer blades 4a, 4A, 4b, 4B about the central axis of the mixer channel twisted around, in the illustrated case about 90 ° is. The axial succession mixer blades 4a, 4b and 4A, 4B have shown here For example, virtually no radial coverage on it only a slight offset of the edges occurs due to the wall thickness of the web 5b. Depending on use the mixing elements are also different extension angle of the Mixer blades 4a, 4A, 4b, 4B about a central axis of the Mischerkanals 2 provided around, for example, larger as 120 ° and about 180 °. It is also envisaged that the extensions axially arranged one behind the other Mixer blades 4a, 4b and 4A, 4B about a central axis Cover the mixer channel 2 around, especially with an overlap angle in the range of 30 ° to 90 °. The Webs 5a, 5b form in the region of the center of the mixer channel 2 a one-piece connection between the axial arranged in the flow direction D one behind the other Mixer blade pairs 4a, 4A and 4b, 4B. Like also out Fig. 2 shows, the mixer channel 2 of two Half-shells 2a, 2b with running in the axial direction formed radial joints. As in the sectional view in Fig. 1 it can be seen as Half shells trained radial mixer channel sections 2a, 2b pocket-shaped on its inner wall Recesses 6, which the outer contour of the mixer wings 4a, 4A, 4b, 4B of the mixer blade element 3 take up. This creates one in the axial direction positive connection between the mixer channel 2 and the mixer blade element 3. Such a configuration the mixer channel 2 allows the formation of mixing elements 1 for highly viscous substances and for large ones Throughputs with cost-effective and commercial available mixer blade elements 3.

Fig. 2b shows a plan view in the flow direction on a mixer element with the same Structure as shown in Figures 1 and 2a Mixer elements 1. It becomes the same mixer blade element as previously shown in the same way with the Mixer channel 2 connected. Unlike the previous ones the examples shown form the two half-shells 2a, 2b in this case, a mixer channel 2 with an oval cross-section.

In the mixing element shown in Fig. 3 1 with radially divided mixer channel 2 has the mixer blade element 3 in the outer region of the mixer blades 4a, 4A, 4b, 4B molded projections 7, which in corresponding Recesses in the inner wall of the mixer channel halves 2a, 2b intervene. Im here shown Case, these projections 7 are integral with the mixer blades 4a, 4A, 4b, 4B formed cylindrical pins, which in corresponding blind holes in the inner wall the mixer channel halves 2a, 2b engage. Even if in the illustrated examples, the mixer blades 4a, 4A, 4b, 4b engage in recesses in the mixer wall 2 to effect a positive fit, so it is provided that the inner wall of the mixer channel projections which in recesses in the mixer blades 4a, 4A, 4b, 4B intervene. Also combinations are provided.

If the mixer channel 2 of the mixing element. 1 formed integrally, so can a positive connection between mixer channel 2 and mixer blade element 3 with Achieve advantage in that the mixer channel 2 on its inner wall is formed as an internal thread 8 and the mixer blades 4a, 4A, 4b, 4B or the mixer blade element 3 on its outer surface a corresponding External thread 9 have or has. Such Embodiment is shown in Fig. 4. It is also intended instead of a thread a bayonet-like Connect between them by e.g. at the outside of the mixer blades 4a, 4A, 4b, 4b and Mixer blade element 3 attached lugs a positive connection in grooves in the mixer channel 2 effect.

Furthermore, the positive locking, as in Fig. 5 is shown by additional elements such as For example, metal pins 10 are generated, which radially through the wall of the mixer channel 2 through corresponding recesses in the mixer blades 4a, 4A, 4b, 4B of the mixer blade element 3 enter.

Another preferred variant is shown in FIG. 6, in which a positive connection in the axial Direction between mixer channel 2 and mixer blade element 3 is achieved by the fact that on the mixer wings 4a, 4A, 4b, 4B of the mixer blade element 3 arranged radially nibbling noses 11 in suitable recesses in engage the inner wall of the mixer channel 2. As in can be seen, the mixer blade element can be seen 3 under compression of the lugs 11 against the Insert flow direction D into the mixer channel 2. After the mixer blade element 3 axially in its intended position in the mixer channel. 2 the lugs 11 snap into recesses, such as e.g. Grooves in the inner wall of the mixer channel 2 and prevent by positive locking an axial displacement of the Mixer blade element 3 in the mixer channel 2 in the flow direction D. In addition to the shown constructive Embodiment, it is also conceivable, for example Mischerflügelelement 3 to design such that the individual mixer blades 4a, 4A, 4b, 4b themselves represent radial nibbling noses, which during insertion of the mixer blade element 3 in the mixer channel 2 radially deflect against the flow direction D. and after engaging in corresponding recesses in the inner wall of the mixer channel 2 at axial Load in the direction of flow D a positive connection make sure they are additional if necessary brace radially in the mixer channel 2.

Fig. 7 shows a static mixer 12 with one arranged in a housing 13 according to the invention Static mixing element 1 according to FIG. 1. In the area of Outlet of the mixing element 1 is a dispensing nozzle 14 arranged, which the targeted application of this mixer mixed stream facilitates. Also if the static mixer 12 shown here with only one static mixing element 1 is shown so are also versions with several, in particular a plurality of axially successively arranged mixing elements 1 provided. Also, embodiments are provided in which several single-stage mixing element segments 16 axially one behind the other are arranged. There are also static mixers 12 provided that both mixing elements 1 and mixing element segments 16 include.

Fig. 8 shows a mixer blade element 3 with in the outer region between the mixer blades 4a, 4b arranged supporting webs 15. In the illustrated Mixer blade element 3 are the mixer blades 4a, 4b as Swirl vanes 4a, 4b formed.

Claims (26)

1. Static mixing element (1), with an essentially tubular and axially undivided mixer duct (2), the inner wall of which forms the radially outer boundary of the cross section through which the product to be mixed is to flow, and with mixer blades (4a, 4A, 4b, 4B) which are radially adjacent to the inner wall of the mixer duct (2) and are formed by at least one moulding separate from the mixer duct (2), at least two of the mixer blades being arranged axially one behind the other in the mixer duct (2), and at least one mixer blade, which in the throughflow direction is located axially upstream of a mixer blade arranged last axially in the throughflow direction being connected to the inner wall in the region in which the said mixer blade is radially adjacent to the inner wall of the mixer duct (2), for the transmission of axially acting forces from the mixer blade to the mixer duct (2), characterized in that the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct is positively connected to the inner wall, in the region in which the said mixer blade is radially adjacent to the inner wall of the mixer duct (2), as a result of the engagement of projecting moulded elements into depressions.
2. Static mixing element (1) according to Claim 1, characterized in that the mixer duct is formed by a plurality of radial segments (2a, 2b), in particular by two half-shells (2a, 2b).
3. Static mixing element (1) according to Claim 1, characterized in that the mixer duct is of one-piece design.
4. Static mixing element (1) according to one of the preceding claims, characterized in that the mixer duct (2) has an essentially constant cross section in the axial direction.
5. Static mixing element (1) according to one of the preceding claims, the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct (2) penetrating radially into one or more depressions (6) in the inner wall of the mixer duct, and, in particular, these depressions having essentially the mixer-blade contour in this region.
6. Static mixing element (1) according to one of the preceding claims, the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct (2) and the inner wall of the mixer duct (2) being configured in such a way that a bayonet-like or threadlike connection (8, 9) is obtained between the said mixer blade and the said inner wall.
7. Static mixing element (1) according to one of the preceding claims, the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct and the inner wall of the mixer duct (2) being configured in such a way that a positive connection is obtained between the said mixer blade and the said inner wall as a result of the engagement or penetration of projections (11) into depressions.
8. Static mixing element (1) according to one of the preceding claims, additional elements (10) being present for bringing about a positive connection between the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct (2) and the inner wall of the mixer duct (2), and, in particular, connecting pins (10) being present for bringing about the positive connection.
9. Static mixing element (1) according to one of the preceding claims, the at least one mixer blade (4a, 4A, 4b, 4B) connected to the inner wall of the mixer duct (2) being arranged in first position axially in the throughflow direction.
10. Static mixing element (1) according to one of the preceding claims, at least two mixer blades (4a, 4A, 4b, 4B) arranged one behind the other in the axial direction being connected to the inner wall in the region in which these are radially adjacent to the inner wall of the mixer duct (2).
11. Static mixing element (1) according to one of the preceding claims, mixer blades (4a, 4b), (4A, 4B) arranged one behind the other in the axial direction and/or mixer blades (4a, 4A), (4b, 4B) located in the same axial position being connected to one another, for the transmission of axially acting forces to one another, and, in particular, the said mixer blades being connected to one another in the region of the centre of the mixer duct (2).
12. Static mixing element (1) according to one of the preceding claims, at least two mixer blades (4a, 4A, 4b, 4B) forming a coherent mixer-blade element (3), and, in particular, this mixer-blade element (3) being of one-piece design.
13. Static mixing element (1) according to Claim 12, the mixer-blade element (3) having at least two mixer blades (4a, 4b), (4A, 4B) arranged one behind the other in the axial direction.
14. Static mixing element (1) according to Claim 13, the mixer blades (4a, 4b), (4A, 4B) of the mixer-blade element (3) which are arranged one behind the other in the axial direction being connected to one another by means of supporting webs (15) in the region which is adjacent to the inner wall of the mixer duct (2).
15. Static mixing element (1) according to Claim 14, the supporting webs (15) being arranged in radial depressions in the inner wall of the mixer duct (2).
16. Static mixing element (1) according to one of Claims 12 to 15, this having at least two mixer-blade elements (3), and, in particular, this having at least two mixer-blade elements (3) arranged axially one behind the other in the mixer duct (2).
17. Static mixing element (1) according to one of the preceding claims, the extents of the mixer blades (4a, 4b), (4A, 4B) arranged axially one behind the other overlapping one another in their extent transverse to the axis of the mixing element (1), and, in particular, these overlapping one another about a central axis of the mixer duct (2), and, in particular, their extents overlapping one another about a central axis of the mixer duct (2) over an angle of 30° to 90°.
18. Static mixing element (1) according to one of the preceding claims, at least some of the mixer blades (4a, 4A, 4b, 4B) being designed as swirl blades (4a, 4A, 4b, 4B), and, in particular, all the mixer blades (4a, 4A, 4b, 4B) being designed as swirl blades (4a, 4A, 4b, 4B).
19. Static mixing element (1) according to Claim 18, swirl blades (4a, 4b), (4A, 4B) arranged one behind the other in the axial direction having opposite swirl directions.
20. Static mixing element (1) according to one of the preceding claims, the mixer duct having an essentially round cross section, and, in particular, this having a circular cross section or this having a non-circular cross section.
21. Static mixing element (1) according to one of Claims 1 to 23, the mixer duct having an essentially angular cross section, and, in particular, this having a square cross section.
22. Static mixing element (1) according to one of the preceding claims, the mixer blades (4a, 4A, 4b, 4B) in each case extending about a central axis of the mixer duct (2) over an angle of at least 90° in the mixer duct (2), and, in particular, extending over an angle of at least 120°, and, in particular, extending over an angle of 180°.
23. Static mixing element (1) according to one of the preceding claims, the mixer blades (4a, 4A, 4b, 4B) and/or the mixer duct (2) being produced from plastic, and, in particular, these being produced from plastic by the injection-moulding method.
24. Static mixer (12), with at least one static mixing element (1) according to one of the preceding claims.
25. Static mixer (12) according to Claim 24, comprising, furthermore, a housing (13) for receiving the at least one static mixing element (1) and, in particular comprising a discharge nozzle (14).
26. Use of the static mixing element (1) or of the static mixer (12) according to one of the preceding claims for the intermixing of high-viscosity substances, in particular for the intermixing of high-viscosity PU with curing accelerators.

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