Extruder-mixer

Abstract

An extruder-mixer with a stator and a rotor arranged coaxially with respect to the stator. The rotor is mounted rotatably in relation to the stator. The stator is at least partly arranged within a volume defined by the rotor. The rotor has a rotor cage with a multiplicity of apertures. The apertures are elongated in a longitudinal direction. The longitudinal direction thereof is skewed with respect to an axis of rotation of the rotor.

Description

[0001] Extruder mixer

[0002] The present invention relates to an extruder mixer having a stator and a rotor arranged coaxially to the stator, wherein the rotor is rotatably mounted relative to the stator.

[0003] Extruder mixers of the type mentioned above are generally known from the state of the art and are typically used for mixing viscous and partially filled fluids, as well as molten polymers.

[0004] A device for mixing plasticizable synthetic resins is disclosed in the utility model DE 7433808 U.

[0005] European Patent EP 0048 590 B1 describes an extruder mixer with a hollow cylindrical stator and a cylindrical rotor mounted within the stator for rotation. The facing cylindrical surfaces of the rotor and stator each carry a plurality of parallel, circumferentially extending rows of cavities.

[0006] An extruder mixer with an extruder screw, consisting of at least one sleeve and a cylindrical screw tip mounted therein, is disclosed in the German patent application DE 10 2007022 287 A1.

[0007] It is an object of the present invention to provide an alternative extruder mixer.

[0008] An extruder mixer is a device specifically designed for use in an extruder to mix the material to be extruded. Therefore, not every device suitable for mixing a fluid can be considered an extruder mixer.

[0009] The extruder mixer has a rotor and a stator. The rotor can be rotated relative to the stator. The stator is non-rotatable in the sense that it cannot be rotated during normal use of the extruder mixer. This can be the case, for example, if the stator is fixedly mounted. Preferably, no further element is arranged between the rotor and stator.

[0010] This problem is solved by arranging the stator, at least in part, within a volume defined by the rotor. It has proven advantageous if the stator, based on its axial length, is arranged predominantly within the rotor.

[0011] The extruder mixer according to the invention creates the basis for extruders with high mixing performance in a compact installation space. Furthermore, it has been found that an extruder mixer in which the stator is arranged at least partially within a volume defined by the rotor can be retrofitted relatively easily to existing extruders. Furthermore, variability is possible through simple axial positioning of the stator. A crucial additional advantage of the extruder mixer according to the invention is the ability to transfer one or more additives through the stator into an internal volume of the rotor.

[0012] The invention incorporates the finding that in all prior art extruder mixers, the rotor is rotatably arranged within the stator. In contrast to this technical prejudice, in the extruder mixer according to the invention, the stator is arranged at least partially within a volume defined by the rotor. It has proven advantageous if the majority of the stator's length is arranged within the volume defined by the rotor.

[0013] In a particularly preferred embodiment, the stator has at least one, in particular elongated recess, and the rotor has at least one, in particular elongated opening. In a further particularly preferred embodiment, the recess and the opening are arranged such that the recess and the opening overlap at least temporarily during operation of the extruder mixer. Preferably, the stator has a plurality of recesses and / or the rotor has a plurality of openings. Preferably, the recesses cover at least 30%, in particular at least 50%, or even at least 80% of a lateral surface of the stator. Preferably, the openings cover at least 30%, in particular at least 50%, or even at least 80% of a lateral surface of the rotor. The fluid can be mixed particularly well through the recesses and openings.

[0014] In another particularly preferred embodiment, the rotor has a rotor cage. It has proven advantageous if the stator has an axial bore through which a fluid can be introduced into the rotor. It has proven advantageous if the stator, based on its axial length, is arranged predominantly within the rotor cage. A rotor cage is understood to be a lattice structure formed by lattice struts and openings formed therebetween.

[0015] In a particularly preferred embodiment, the rotor has a plurality of openings. The opening or openings can each be provided as a bore or slot. In a particularly preferred embodiment, the openings of the rotor are arranged in several rows of openings. It has proven advantageous if the rows of openings each extend in the longitudinal direction (axial direction) of the rotor, in particular parallel to a rotational axis of the rotor. In a further particularly preferred embodiment, the rows of openings are arranged on the rotor at equal distances from one another along a circumference of the rotor. It has proven advantageous if the openings are elongated in a longitudinal direction and their longitudinal direction each runs parallel to a rotational axis of the rotor. Alternatively, the longitudinal direction of the openings can each run skew to the rotational axis of the rotor.

[0016] The recesses on the stator are elongated in a longitudinal direction. The longitudinal direction of the recesses is skewed relative to the rotor's rotation axis. The longitudinal direction of an opening can be parallel to the longitudinal direction of a recess. The longitudinal direction of an opening can be skewed or offset relative to the longitudinal direction of a recess.

[0017] In a further particularly preferred embodiment, the stator has a plurality of recesses. In a particularly preferred embodiment, the recesses of the stator are arranged in a plurality of rows of recesses. It has proven advantageous if the rows of recesses each extend in the longitudinal direction of the stator, in particular parallel to the axis of rotation of the rotor. In a further particularly preferred embodiment, the rows of recesses are arranged on the stator at equal distances from one another along a circumference of the rotor. It has proven advantageous if the longitudinal section of the stator on which the plurality of recesses involved in the mixing process are formed is arranged to a predominant extent, preferably at least 50 percent, more preferably at least 80 percent, within the rotor and / or rotor basket.

[0018] It has proven advantageous if an opening in the rotor is positioned centrally offset from a corresponding recess in the stator. A central offset can relate to the circumferential direction and / or the longitudinal direction of the stator. The number and size of the recesses in the stator and the number and size of the openings in the rotor as well as the axial positioning of the rotor and stator relative to one another vary the mixing effect (by changing the overlap of inlet / outlet overlaps). Thus, for example, the mixing performance of the extruder mixer can be significantly influenced by replacing the stator. The arrangement of the openings in the rotor and the corresponding recesses in the stator is preferably selected in rows and / or with a central offset of preferably 50% of a row unit.By axially shifting the stator relative to the rotor, the offset (overlap) can be varied (10 - 50% / 90 - 50%).

[0019] In another particularly preferred embodiment, the rotor apertures are arranged in an axially offset or helical configuration. It has proven advantageous if the rotor apertures are arranged in a single- or multi-threaded helix, and the apertures preferably correspond to the stator recesses. It has proven advantageous if the stator recesses are arranged in a single- or multi-threaded helix.

[0020] In a further particularly preferred embodiment, the openings in the rotor and / or the corresponding recesses in the stator are designed as a calotte, pitch circle disc or groove.

[0021] In a particularly preferred embodiment, the number of recesses in the stator differs from the number of openings in the rotor. It has proven advantageous if the number of openings in the rotor is at least one greater than the number of corresponding recesses in the stator.

[0022] It has proven advantageous if a width of the openings in the rotor and / or a width of the corresponding recesses in the stator is preferably 5 to 35 mm. A width of the openings and the recesses is determined along the circumferential direction of the rotor or stator. A length of the openings in the rotor and / or a length of the corresponding recesses in the stator is preferably a multiple, preferably a factor of 2 to 5, of the respective width of the opening and / or the recess. In a further particularly preferred embodiment, a maximum depth of the recess in the stator, based on a radial direction of the stator, is preferably 5 to 15 mm. With regard to rheological optimization, it has proven advantageous if the radii of the openings and / or the radii of the recesses are selected proportional to the respective widths. In a particularly preferred embodiment, a radius is more than 2 mm.

[0023] It has proven advantageous if the rotor openings and / or the stator recesses extend parallel to the rotor's rotational axis, each with respect to their longitudinal direction. Alternatively, the rotor openings and / or the stator recesses can extend at an angle to the rotor's rotational axis, each with respect to their longitudinal direction. It has proven advantageous if such an angle is set in the range of -45° to +45° with respect to the rotational axis.

[0024] The invention is also achieved by an extruder with an extruder mixer of the type described above, and with an extruder screw mounted in a screw housing of the extruder, which is coupled to a screw drive of the extruder. The extruder according to the invention can be further developed in a corresponding manner by the features described with reference to the extruder mixer. It has proven advantageous if the rotor is arranged at least in sections within a volume spanned by the screw housing. It has proven advantageous if the rotor, based on its rotor length in the axial direction, is arranged predominantly within the screw housing. In a particularly preferred embodiment, the stator, the rotor and the screw housing are arranged coaxially to one another.

[0025] In a particularly preferred embodiment, the screw drive is rotationally coupled to the rotor of the extruder mixer. In other words, rotation of the screw drive preferably results in rotation of the rotor of the extruder mixer.

[0026] In a further particularly preferred embodiment, the extruder has an extruder head. It has proven advantageous if the screw housing is flanged to the extruder head. In a particularly preferred embodiment, the stator of the extruder mixer is arranged in a rotationally fixed manner with respect to the extruder head. The stator can be screwed to the extruder head. It has proven advantageous if the extruder screw is formed integrally with the rotor. In a further particularly preferred embodiment, the screw drive is arranged on a side of the screw housing facing away from the extruder head. In a further particularly preferred embodiment, the extruder has a rotor drive that can be operated independently of the screw drive. It has proven advantageous if the rotor drive is rotationally coupled to the rotor of the extruder mixer.It has proven advantageous to locate the screw drive on the screw housing side. Alternatively, the screw drive can be located on the rotor side of the extruder mixer.

[0027] Further advantages will become apparent from the following description of the figures. Various embodiments of the present invention are illustrated in the figures. The figures, the description, and the claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and combine them into further meaningful combinations. In the figures, identical and similar components are numbered with the same reference numerals. They show:

[0028] Fig. 1 shows a first preferred embodiment of an extruder mixer;

[0029] Fig. 2 shows a first preferred embodiment of an extruder;

[0030] Fig. 3 shows a second preferred embodiment of an extruder; and

[0031] Fig. 4 shows a third preferred embodiment of an extruder;

[0032] Fig. 5 shows a preferred embodiment of an extruder according to the invention;

[0033] Fig. 6 shows a preferred embodiment of a rotor basket;

[0034] Fig. 7 shows a preferred embodiment of a stator; and

[0035] Fig. 8 shows an assembly of the rotor basket of Fig. 6 with the stator of Fig. 7. A first preferred embodiment of an extruder mixer 10 is shown in Fig. 1. The extruder mixer 10 is equipped with a stator 1 and a rotor 3 arranged coaxially to the stator 1. The rotor 3 is rotatably mounted relative to the stator 3. During operation, the rotor 3 rotates about the rotation axis R. The stator 1 has a plurality of recesses 5, and the rotor 3 has a plurality of openings 7. At least one recess 5 overlaps with at least one opening 7.

[0036] The stator 1 is arranged at least in sections within a volume RV spanned by the rotor 3. As can be seen from Fig. 1, a stator shaft 6 of the stator 3 is located for the most part, with respect to the axial direction AR, within a rotor cage 4 of the rotor 3. A stator shaft 6 is to be understood in particular as that region of the stator 3 in which the plurality of recesses 5 are formed. The stator 3 comprises the stator shaft 6 and a stator head 8 formed integrally with the stator 6. A rotor cage 4 is to be understood in particular as that region of the rotor 3 in which the plurality of openings 7 are formed.

[0037] As can also be seen from Fig. 1, the openings 7 of the rotor 3 are arranged in a plurality of opening rows RD1, RD2, etc. The opening rows RD1, RD2 each extend in the axial direction AR and are arranged on the rotor 3 at equal distances from one another along a circumference U of the rotor 3. The recesses 5 of the stator 1 are arranged in a plurality of recess rows RA1, RA2, etc. The recess rows RA1, RA2 each extend in the axial direction AR and are arranged on the stator 1 at equal distances from one another along a circumference U of the stator 1.

[0038] The stator 1 also has an axial bore 2 (see also Fig. 2) through which a fluid can be introduced into the rotor 3.

[0039] A first embodiment of an extruder 100 is shown in Fig. 2. The extruder 100 has an extruder mixer 10 according to the embodiment of Fig. 1. As can be seen from Fig. 2, the extruder 100 is equipped with an extruder screw 30 mounted in a screw housing 20 of the extruder 100. The extruder screw 30 is coupled to a screw drive 40 of the extruder 100 so that the extruder screw 30 can be set in rotation about the rotation axis R. The screw drive 40 is arranged on a side of the screw housing 20 facing away from the extruder head 50. The extruder 100 has an extruder head 50, wherein the screw housing 30 is flange-mounted to the extruder head 50. The stator head 8 of the stator 1 of the extruder mixer 10 is screwed to the extruder head 50 and is thus arranged in a rotationally fixed manner with respect to the extruder head 50.The term extruder head implies that this component with the described functions is positioned at the head end of an extruder and preferably accommodates measuring devices for the physical description of the extruded fluid / polymer (e.g. pressure and temperature sensors).

[0040] The screw drive 40 is in turn rotationally coupled to the rotor 3 of the extruder mixer 10, so that the rotor 3 can be set in rotation about the rotation axis R. In the presently illustrated embodiment, the extruder screw 30 is rotationally coupled to the rotor 3 of the extruder mixer 10, so that the screw drive 40 drives both the extruder screw 30 and the rotor 3 in rotation.

[0041] Clearly visible in Fig. 2 is the axial bore 2, which extends coaxially to the rotation axis R within the stator 1. A fluid, for example a paint component, can be introduced into the rotor 3 via the axial bore 2.

[0042] The extruder head 50 centrally accommodates a single- or multi-part stator 1. This stator 1 integrates the functions of a stationary stator head 8 and the axial bore 2 (or possibly a plurality of bores) for connecting and feeding the components to be mixed into the mixing chamber formed by the rotor 3. Mechanically or hydraulically controlled internals for temporarily sealing and / or throttling the supplied fluid can be provided in the stator shaft 6 of the bore(s), which serves as the outlet area. The fluid flow exiting the axial bore 2 is forced into the central mixer cavity positioned on the head side and from there evenly distributed radially over the circumference and the first openings 4. The stator 1 in the area of ​​the extruder head 8 also contains the described recesses 5 (stator cavities), which are arranged corresponding to the openings 7 (rotor openings) of the rotor 3.Both the extruder head 50 and the filler piece 1 are provided with holes for accommodating sensors. Heating can be achieved using liquid media as well as contact and convection heating. Proper operation allows the rotor 3 and the connected extruder screw 30 to rotate both left and right around the central stator 1. The stator 1 can, in turn, be assembled from several components, which preferably allows for easy variation / replacement of the recesses 5 (mixer cavities).

[0043] A second embodiment of an extruder 200 is shown in Fig. 3. The extruder 200 has an extruder mixer 10 according to the embodiment of Fig. 1. The extruder 200 is equipped with an extruder screw 30 mounted in a screw housing 20 of the extruder 200. The extruder screw 30 is coupled to a screw drive 40 of the extruder 200, so that the extruder screw 30 can be set in rotation about the rotation axis R. In contrast to the embodiment of Fig. 2, in the extruder 200 of Fig. 3, the separate or extended screw housing 21, with the extruder screw 31 and the additional screw drive 41 - which together can be referred to as a feed unit - are arranged on a side facing away from the rotor 3 within the stator head 8.

[0044] As can be seen from Fig. 3, the extruder 200 has a second drive 41 that can be operated independently of the screw drive 40 (or rotor drive 60). The drive 41 is rotationally coupled to an extruder screw 31, which rotates in a temperature-controlled cylinder, which is flanged separately or integrally formed with the cylinder of the extruder mixer 100, and conveys a fluid or generates a polymer melt. This second drive 41 is arranged opposite the screw drive 40 (or rotor drive 60) with respect to the stator head 8 and uses both the cylinder 21 and the stator 8 as an enveloping cylinder.In the outlet area of ​​the stator head 6, either a mechanically or hydraulically operating functional unit X is positioned on the rotating extruder screw 31, or a throttling effect and / or closure of the outlet is possible through appropriate shaping of the outlet area and the axial positioning of the rotating extruder screw 31. Temperature control of the cylinders 20 and 21 can be achieved using liquid media as well as contact and convection heating (and combinations). Proper operation enables the connected screw 21 to rotate both left and right in the central filler piece 8, which also contains the described cavities (stator cavities) 5, which are arranged to correspond with the openings of the rotor (rotor openings).

[0045] The mechanically or hydraulically operating functional unit X, positioned in the outlet area of ​​the stator shaft 6, can alternatively be coupled to the worm drive 40 (or rotor drive 60). The specific versions of the functional unit X are as a throttle unit X1, a blocking unit X2, or a volume pump X3.

[0046] A third embodiment of an extruder 300 is shown in Fig. 4. The extruder 300 has an extruder mixer 10 according to the embodiment of Fig. 1. As in the embodiment of Fig. 3, in the extruder 300 of Fig. 4, the screw housing 20, the extruder screw 30, and the screw drive 40—which together can be referred to as the feed unit—are arranged on the side of the stator head 8 facing away from the rotor 3.

[0047] In contrast to the embodiment of Fig. 3, the extruder 100 of Fig. 4 has only one drive in the form of the screw drive 40. The screw drive 40 is arranged on the side of the screw housing 20. Alternatively, instead of the screw drive 40, a rotor drive 60 can be arranged on the side of the rotor 3 of the extruder mixer 10.

[0048] A rotary coupling of the screw drive 40 with the rotor 3 of the extruder mixer 10 is achieved by a coupling rod which extends coaxially to the rotation axis R through the stator 1.

[0049] Proper operation is achieved by feeding volume flows of various polymers and / or liquids into the extruder mixer via the screw conveyor and / or feed holes. Figure 2 shows the minimal case of polymer supply via a screw V0 and the pressure feed of the second volume flow V1 into the extruder mixer 10. An outlet hole discharges the mixture as volume flow VM from the extruder mixer 10. The number of pressure feeds of additional volume flows VX is not limited.

[0050] The illustration in Fig. 3 shows the intended operation by supplying two volume flows V0, V1 via the separately driven screws / rotors and the pressure feed of a third volume flow V2 into the extruder mixer 10. An outlet hole discharges the mixture as volume flow VM from the extruder mixer 10. The number of pressure feeds of further volume flows VX is not limited.

[0051] The illustration in Fig. 4 shows the intended operation by supplying volume flow V1 via the coupled driven screws / rotors and the pressure feed of a second volume flow V2 into the extruder mixer 10. An outlet bore releases the mixture as volume flow VM from the extruder mixer 10. The number of pressure feeds of further volume flows VX is not limited.

[0052] A fourth embodiment of an extruder 200 according to the invention is shown in Fig. 5. The embodiment of Fig. 5 is structurally similar to the embodiment of Fig. 2 with the difference that, during normal operation of the extruder 200 of Fig. 5, no supply of a volume flow V0 takes place and cannot take place on the screw drive side. During normal operation, the supply of the volume flows takes place by feeding the volume flows V0, V1, and VX into the extruder head 50, i.e., perpendicular to the rotational axis R of the rotor 3. During normal operation, the volume flow VM (volume flow "mixture") exits the stator 1 through the axial bore 2.

[0053] Fig. 6 shows a preferred embodiment of rotor 3, which has a rotor cage 4 with a plurality of openings 7. In contrast to the embodiments of Figs. 1 to 5, in which the openings 7 are elongated in a longitudinal direction and their longitudinal direction runs parallel to a rotational axis R of the rotor 3, the openings 7 do not run parallel to the rotational axis R of the rotor 3 in their longitudinal direction L7.

[0054] Fig. 7 shows a preferred embodiment of a stator 1 having a plurality of recesses 5. In contrast to the embodiments of Figs. 1 to 5, in which the recesses are elongated in a longitudinal direction and their longitudinal direction runs parallel to a rotational axis R of the rotor 3, the recesses 5 do not run parallel to the rotational axis R of the rotor 3 (not shown here) in their longitudinal direction L5.

[0055] Finally, Fig. 8 shows an extruder mixer as an assembly of the rotor 3 of Fig. 6 with the stator 1 of Fig. 7. As can be seen from Fig. 8, the longitudinal direction L7 of the openings 7 does not run parallel to the longitudinal direction L5 of the recesses 5. This can positively influence the mixing behavior of the extruder mixer. List of reference symbols

[0056] 1 stator

[0057] 2 axial bore

[0058] 3 Rotor

[0059] 4 Rotor cage

[0060] 5 Recess

[0061] 6 Stator shaft

[0062] 7 Breakthrough

[0063] 8 Stator head

[0064] 10 extruder mixers

[0065] 20 snail shells

[0066] 21 snail shells

[0067] 30 extruder screw

[0068] 31 Extruder screw

[0069] 40 worm drive

[0070] 41 Worm drive

[0071] 50 extruder head

[0072] 60 rotor drive

[0073] 100 extruders with extruder mixer

[0074] 200 extruders / mixers independent

[0075] 300 extruders / mixers coupled

[0076] AR Axial direction

[0077] L5 Longitudinal direction recess

[0078] L7 Longitudinal breakthrough

[0079] R Rotation axis RA Recess row

[0080] RD breakthrough series

[0081] RV rotor volume

[0082] T Tempering U Circumference

[0083] K Clutch

[0084] X Functional unit (coupleable)

[0085] X1 Functional unit chokes

[0086] X2 Functional unit shut-off

[0087] X3 Functional unit pumps

[0088] VO volume flow "0"

[0089] V1 Volume flow "1"

[0090] V2 Volume flow "2"

[0091] VX Volume flow "X"

[0092] VM volume flow "mixture"

Claims

Patent claims 1. Extruder mixer (10) with a stator (1) and a rotor (3) arranged coaxially to the stator (1), wherein the rotor (3) is rotatably mounted relative to the stator (3), wherein the stator (1) is arranged at least in sections within a volume (RV) spanned by the rotor (3), characterized in that the rotor (3) has a rotor basket (4) with a plurality of openings (7), wherein the openings (7) are elongated in a longitudinal direction (L7) and their longitudinal direction (L7) each runs skew to a rotation axis (R) of the rotor (3).

2. Extruder mixer (10) according to claim 1, characterized in that the stator (1) has at least one recess (5) and the rotor (3) has at least one opening (7), wherein the recess and the opening overlap at least temporarily during operation of the extruder mixer (10).

3. Extruder mixer (10) according to claim 1 or 2, characterized in that the stator (1) has an axial bore (2) through which a fluid can be introduced into the rotor (3).

4. Extruder (100) with an extruder mixer (10), wherein the extruder mixer (10) has a stator (1) and a rotor (3) arranged coaxially to the stator (1), wherein the rotor (3) is rotatably mounted relative to the stator (3), wherein the stator (1) is arranged at least in sections within a volume (RV) spanned by the rotor (3), and the rotor (3) has a rotor basket (4) with a plurality of openings (7), wherein the openings (7) are elongated in a longitudinal direction (L7) and their longitudinal direction (L7) each runs skewed to a rotation axis (R) of the rotor (3), and with an extruder screw (30) mounted in a screw housing (20) of the extruder (100) and coupled to a screw drive (40) of the extruder (100).

5. Extruder (100) according to claim 4, characterized in that the extruder mixer (10) is designed according to claim 2 or 3.

6. Extruder (100) according to claim 4 or 5, characterized in that the extruder (100) has an extruder head (50), wherein the screw housing (30) is flanged to the extruder head (50), and the stator (1) of the extruder mixer (10) is arranged in a rotationally fixed manner with respect to the extruder head (50).

7. Extruder (100) according to claim 6, characterized in that the extruder screw (30) is formed integrally with the rotor (3).

8. Extruder (100) according to claim 7, characterized in that the screw drive (40) is arranged on a side of the screw housing (20) facing away from the extruder head (50).

9. Extruder (100) according to one of claims 4 to 6, characterized in that the screw drive (40) is arranged on the side of the screw housing (20).

10. Extruder (100) according to one of claims 4 to 6, characterized in that the screw drive (40) is arranged on the side of the rotor (3) of the extruder mixer (10).

11. Extruder (200) according to claim 4, characterized in that the extruder (200) has a rotor drive (60) which can be operated independently of the screw drive (40), wherein the rotor drive (60) is rotationally coupled to the rotor (3) of the extruder mixer (10).

12. Extruder (200) according to claim 9, characterized in that the screw drive (40) of an extruder or a separate rotor drive (60) is rotationally coupled to the rotor (3) of the extruder mixer (10) and within the stator head (8) a further screw drive (41) with extruder screw (31) operates centrally to the rotation axis ®.

13. Extruder (200) according to claim 9, characterized in that the screw drive (41) with extruder screw (31) operates centrically to the rotation axis (R) and can be positioned in the axial direction (AR).

14. Extruder (200) according to claim 9, characterized in that either the screw drive (40) of an extruder or a separate rotor drive (60) is coupled (K) to a functional unit (X) in the interior of the stator (1).

15. Extruder (200) according to claim 12, characterized in that the functional unit (X) inside the stator (1) has the function of a throttle (XI).

16. Extruder (200) according to claim 12, characterized in that the functional unit (X) inside the stator (1) has the function of a shut-off device (X2).

17. Extruder (200) according to claim 12, characterized in that the functional unit (X) inside the stator (1) has the function of a volume pump (X3).

18. Extruder with an extruder mixer (10) with a stator (1) and a rotor (3) arranged coaxially to the stator (1), wherein the rotor (3) is rotatably mounted relative to the stator (3), wherein the stator (1) is arranged at least in sections within a volume (RV) spanned by the rotor (3), in particular according to one of claims 4 to 17, wherein the extruder has an extruder head (50) with a feed through which volume flows are fed to the extruder.

19. Extruder according to claim 18, wherein the feed is formed perpendicular to a rotation axis (R) of the rotor (3).

20. Extruder (300) according to claim 4, characterized in that the extruder (300) has only one screw drive (40) or rotor drive (60), wherein the rotor and the extruder screw are rotationally coupled.

21. Extruder (300) according to claim 20, characterized in that the extruder (300) has the screw drive (40) or rotor drive (60) is positioned at one of the two ends of the rotary-coupled unit.

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