Rotary press

Abstract

The invention relates to a rotary press comprising a rotor rotatable by means of a rotary drive, wherein the rotor has an upper punch guide (18) for upper press punches (14) and a lower punch guide (20) for lower press punches (16), as well as a die disk (10) arranged between the punch guides (18, 20), wherein the press punches (14, 16) interact with cavities (12) of the die disk (10), wherein the rotary press further comprises a filling device (26) by which powder material to be compressed is filled into the cavities (12) of the die disk (10), and wherein the rotary press comprises a pressure device (34) with an upper pressure unit (40) and a lower pressure unit (42), which, in operation, engage with the upper press punches (14) and with the lower press punches (16) to compress the powder material in the cavities (12) of the die disk (10). Pressings (48) work together,and wherein the rotary press comprises a stripping device (44) for stripping the compacts (48) ejected onto the top of the die (10) after compression by the lower press punches (16), wherein the stripping device (44) has a stripping channel (46) arranged at least partially above the die (10), so that compacts (48) ejected from the cavities (12) onto the top of the die (10) by the lower press punches (16) are guided along the stripping channel (46) from the die (10) to a first compact discharge (58).

Description

[0001] The invention relates to a rotary press comprising a rotor rotatable by means of a rotary drive, wherein the rotor has an upper punch guide for upper press punches and a lower punch guide for lower press punches, as well as a die disc arranged between the punch guides, wherein the press punches interact with cavities of the die disc, wherein the rotary press further comprises a filling device by which powder material to be compressed is filled into the cavities of the die disc, and wherein the rotary press comprises a pressure device with an upper pressure unit and a lower pressure unit which, in operation, interact with the upper press punches and with the lower press punches to compress the powder material in the cavities of the die disc into compacts.and wherein the rotary press comprises a stripping device for stripping the compacts ejected onto the top of the die after pressing by the lower press rams, wherein the stripping device has a stripping channel arranged at least partially above the die, so that compacts ejected from the cavities onto the top of the die by the lower press rams are guided along the stripping channel from the die to a first compact discharge.

[0002] Rotary presses typically incorporate a multitude of upper and lower press rams, each pair assigned to a cavity of a die. During operation, the upper and lower press rams rotate together with the die, their axial movement controlled by cams and guided by upper and lower ram guides. As the press rotates, the die passes through various components of the rotary press: a filling unit, where powder material to be compressed is fed into the cavities of the die, and a pressing unit, where the upper and lower press rams are typically pressed into the cavities by upper and lower pressure rollers to compress the powder material into pellets, such as tablets.Following the pressing mechanism, the upper press rams are moved upwards out of the cavities, and the pellets produced in the cavities are pushed by the lower press rams onto the top of the die. Such rotary presses also include a stripping device for removing the pellets ejected onto the top of the die after the pressing process by the lower press rams. The stripping device comprises a stripping channel, which is located at least partially above the die and directs the pellets ejected onto the top of the die from the rotating die beneath the stripping channel to a first pellet discharge. This first discharge can, for example, be for pellets identified as good.

[0003] To ensure the smooth transport of tablets to the first tableting run, DE 10 2016 101 027 B4 and DE 10 2016 101 028 B4 describe a vacuum device in a feed channel following a scraper. This device uses vacuum to suction tablets guided by the scraper towards the feed channel from the die disc and convey them through the feed channel. This prevents tablets from lying individually on the die disc and ensures smooth tablet transport. Air curtains can also be used to stabilize the tablets on the die disc. For this purpose, a constant airflow can be directed towards the tablets, pressing them onto the die disc.

[0004] Although the described vacuum systems ensure reliable tablet removal from the feed channel once the tablets are in place, under unfavorable conditions, tablets can accumulate after leaving the cavity, particularly since the tablets are accelerated vertically by the lower press rams during ejection. Furthermore, the vacuum stripping systems require considerable space in the rotary press, and reliable tablet removal necessitates a high flow rate and thus a large quantity of extraction air, which is particularly expensive in the pharmaceutical industry.

[0005] Based on the prior art described above, the invention is therefore based on the objective of providing a rotary press of the type mentioned at the outset, which enables the reliable conveying of pressed products to the first pressed product run in a space-saving and resource-conserving manner at all times.

[0006] The invention solves the problem through the subject matter of independent claim 1. Advantageous embodiments can be found in the dependent claims, the description and the figures.

[0007] For a rotary press of the type mentioned above, the invention solves the problem by providing that the section of the stripping channel arranged above the die disc has a vacuum device by which the press pieces located on the die disc are sucked along the stripping channel to the first press piece discharge.

[0008] The basic design of the rotary press, as described in the present invention, has been explained at the outset. As explained, the upper and lower ram guides direct the press rams during their axial movement. The ram heads interact with cam tracks that move the press rams axially as they rotate with the rotor, in particular towards and away from each other. The cam tracks are generally composed of several cam track elements. They can accommodate the ram heads in corresponding guide receptacles or simply bear against a mirror surface of the ram heads. The pressure device generally comprises an upper pressure roller and a lower pressure roller, which interact with the ram heads of the upper and lower press rams, respectively. Multiple pressure devices of this type can also be provided, for example, pre-pressure devices and main pressure devices.The ejector cam, as part of the control cams, moves the lower press rams upwards after the pellets have been formed in the respective cavity, so that the pellets reach the top of the die plate, from where they are conveyed via the stripper channel to the first pellet discharge. The pellets can be, in particular, tablets. The rotary press can accordingly be a rotary tablet press. The tablets can be, for example, pharmaceutical tablets.

[0009] The stripping channel can, for example, be crescent-shaped. It can have a first section located above the die disc and a second section radially outside the die disc. It is stationary relative to the rotor, particularly the die disc, so that the die disc rotates beneath the stripping channel during operation of the rotary press. The stripping channel can be positioned a short distance above the die disc. In particular, this distance is smaller than the thinnest pellet to be produced in the rotary press, ensuring that all pellets are captured by the stripping channel. As the die disc rotates, the pellets ejected onto the top of the die disc by the lower press rams after the pressing process are stripped from the die disc by the stripping channel, specifically by a channel wall of the stripping channel, and conveyed towards the first pellet discharge.As explained, the first pressing process can, for example, be a good process for pressings that have been identified as good by sensors of the rotary press.

[0010] According to the invention, the section of the stripping channel located above the die disk has a vacuum device by which the compacts located on the die disk are drawn along the stripping channel to the first compact discharge point. The vacuum device is thus integrated into the stripping channel, and in particular into the section of the stripping channel located above the die disk. The vacuum device is therefore located close to the discharge point where the compacts are pushed from the cavity onto the upper surface of the die disk by the lower press rams. The compacts are thus stabilized very early, in particular immediately after leaving the respective cavity, by a gas flow, especially an air flow, generated by the vacuum device and accelerated along the stripping channel towards the first compact discharge point.This ensures particularly reliable tablet conveyance through the stripping channel and reliably prevents tablet jams. At the same time, the vacuum system is arranged on or integrated into the stripping channel in a compact and space-saving manner. Because the vacuum system is located on the stripping channel, it also has to operate over a shorter distance than if it were located in a feed channel downstream of the stripping channel, thus requiring less compressed gas or air for its operation and conserving resources.

[0011] In one embodiment, the vacuum device can be arranged on the section of the stripping channel located above the die plate in such a way that a suction effect is generated on the pellets by the vacuum device even during ejection from the cavities by the lower press rams. In this embodiment, the vacuum device is arranged on the stripping channel such that a suction effect on the pellets generated by the vacuum device occurs even when they are still within their respective cavities during the ejection process by the lower press rams. In this embodiment, the vertical acceleration of the pellets from the cavities caused by the lower press rams is superimposed and redirected by the suction effect generated by the vacuum device, thus stabilizing the pellet movement.Accumulation and mutual overtaking of pellets during ejection from the cavities are particularly reliably prevented.

[0012] In a further embodiment, the vacuum device can be arranged on the section of the stripping channel located above the die plate such that the pellets ejected from the cavities by the lower press rams are overflowed by an airflow generated by the vacuum device. By arranging the vacuum device on the section of the stripping channel located above the die plate, a particularly effective overflow of pellets onto the die plate is achieved due to the suction effect generated by the vacuum device. This overflow results not only in a suction force parallel to the bottom of the die plate or the stripping channel in the direction of the first pellet exit, but also in a force component directed vertically upwards.The combination of these forces acting on the pellets results in a particularly even and smooth conveying of the pellets across the surface.

[0013] In a further embodiment, the vacuum device can have vacuum nozzles integrated into the section of the discharge channel located above the die disc. The desired suction effect can be generated by the vacuum nozzles, preferably through the Venturi effect. The vacuum nozzles can expel a pressurized gas, for example, compressed air, in the desired direction of movement of the pellets to create a vacuum that conveys the pellets in this direction. The vacuum nozzles create a suction effect in the direction of movement of the pellets towards the first pellet discharge point. This embodiment achieves particularly efficient conveying of the pellets.

[0014] In a further embodiment, it can be provided that vacuum nozzles integrated into the section of the stripping channel located above the die plate are arranged above and / or near the ejection point of the compacts as they are ejected from the cavities by the lower press rams. By arranging the vacuum nozzles above and / or near the ejection point of the compacts as they are ejected from the cavities, the vertical acceleration of the compacts during the ejection process is advantageously deflected and stabilized by the suction effect, as explained above. Furthermore, by arranging the nozzles at or near the ejection point, the amount of compressed gas or compressed air required can be further reduced compared to the prior art.

[0015] In a further embodiment, the stripping channel may have a first channel wall that guides the compacts to the first compact discharge point and a channel cover that at least partially covers the stripping channel, and vacuum nozzles may be arranged in the first channel wall and in the channel cover. The stripping channel may also have a second channel wall opposite the first, with vacuum nozzles also being arranged in the second channel wall. The first channel wall, the channel cover, and the second channel wall may form a U-profile. They may be formed in one piece or from several sections. The aforementioned annular arrangement of the vacuum nozzles around the conveying space for the compacts, which is defined by the stripping channel, achieves a particularly uniform and effective suction effect on the compacts in the direction of movement towards the compact discharge point.Opposite the channel ceiling, the stripping channel is open, particularly in the section located above the die disc, so that the space defined by the stripping channel is bounded on the underside, at least in the area of ​​the section located above the die disc, by the surface of the die disc. A section of the stripping channel located radially outside the die disc, however, may have a channel bottom opposite the channel ceiling to guide the compacts.

[0016] In a further embodiment, the vacuum nozzles can each have an elongated nozzle section extending in the conveying direction of the compacts towards the first compact outlet, and a pressurized gas, in particular compressed air, is forced through the elongated nozzle section by the vacuum device. The elongated section can be straight or curved. In this way, the Venturi effect, which can be used for suction as explained above, is utilized particularly effectively.

[0017] In a further embodiment, the vacuum device can be provided with a compressed gas supply device, in particular a compressed air supply device, for supplying the vacuum nozzles with compressed gas, in particular compressed air, wherein the compressed gas supply device has a supply channel leading along the wiper channel from a compressed gas supply to the vacuum nozzles. The supply channel can be integrated into the wiper channel. These embodiments allow for a particularly compact and space-saving design, since the supply channel of the compressed gas supply device runs parallel to or is integrated into the wiper channel.

[0018] In a further embodiment, a sorting device may be provided for separating the pressed pellets ejected from the cavities into a second pellet conveyor located upstream of the first pellet conveyor in the conveying direction. This sorting device includes a sorting nozzle for removing pellets into the second pellet conveyor using compressed gas. The sorting nozzle can also be supplied with compressed gas, for example, via the supply channel or a separate supply channel. If a separate supply channel is provided, it can also run parallel to or be integrated into the scraper channel.The second pressing stage, which might be a reject stage for pressings identified as defective by sensors in the rotary press, is located upstream of the first pressing stage in the direction of the pressings' movement. With the rejecting device inactive, the pressings are conveyed past the second pressing stage through the stripping channel towards the first pressing stage. However, if a pressing is identified as defective and needs to be rejected, the rejecting device is activated. Specifically, a burst of compressed gas, particularly compressed air, is applied to the pressing via the rejecting nozzle, perpendicular to its direction of movement, thus deflecting the pressing from its path into the second pressing stage.While the first pressing process, for example, can result in good pressings being processed further, the second pressing process can result in reject pressings being sent out. In the aforementioned configurations, the compressed gas supply required anyway for sorting by the sorting device can advantageously be used simultaneously to supply the vacuum system. This further simplifies the design and achieves additional space savings.

[0019] With further modification, the stripping channel can extend all the way to the sorting device. This allows the suction effect to be generated particularly close to the point where the compacts are ejected from the cavities. The additional channel length created in this way generates the negative pressure within the channel, and thus simultaneously on the die plate. To achieve a particularly compact design, the sorting nozzle can be integrated into the stripping channel.

[0020] In a further embodiment, it can be provided that a first detector device is arranged in the first pressing line, which detects pressings passed through the first pressing line, and / or that a second detector device is arranged in a second pressing line, which detects pressings passed through the second pressing line. Pressings produced in the rotary press are selectively directed into either the first or the second pressing line, in particular depending on whether the pressings are identified as good or bad. As explained above, the second pressing line can be a reject line for pressings identified as bad by sensors in the rotary press. The second pressing line can, in particular, be the second pressing line described above, so reference can be made to the explanations above.

[0021] In the aforementioned embodiment, a first detector device can be arranged in the first pressing unit flow, which detects pressing units conveyed through the first flow. Furthermore, a second detector device can be arranged in the second pressing unit flow, which detects pressing units conveyed through the second flow. In the prior art, rejected pressing units are detected, in particular, by monitoring the pressure build-up of the nozzle assemblies used to transport the pressing units. For example, if the nozzle assemblies become clogged, this can lead to erroneous detection results. This problem is overcome by the aforementioned embodiment. Simultaneously, redundant detection of rejected pressing units can be implemented.

[0022] By placing a suitable detector in both the first and second pressing streams, a pressing conveyed through the second stream (designed, for example, as a reject channel) can be directly detected. Conversely, a gap corresponding to the rejected pressing can be detected in the pressing stream conveyed through the second stream (designed, for example, as a good channel), thus indirectly identifying the rejected pressing. This ensures reliable, redundant monitoring of the pressing sorting process. False detection results due to blocked nozzle openings or similar issues are eliminated.

[0023] Suitable detector devices include, for example, light barriers, especially pipe light barriers. Light barriers enable particularly reliable and error-free detection of pressed pellets or gaps in the pellet stream. However, other sensors are also possible for the detector devices, such as capacitive sensors.

[0024] An embodiment of the invention is explained in more detail below with reference to the figures. They schematically show: Figure 1 shows a rotary press according to the invention in a developed view of the rotor, Figure 2 shows a part of the rotary press made of Figure 1 In perspective view, Figure 3 shows a top view of the stripping channel of the rotary press according to the invention, Figure 4 shows a sectional view along line BB in Figure 3 Figure 5, a sectional view along line CC in Figure 3, and Figure 6, a representation illustrating the overflow of a tablet produced in a rotary press.

[0025] Unless otherwise stated, the same reference symbols in the figures denote the same objects.

[0026] The in Figure 1The rotary press shown according to the invention is a rotary press for tablet production, in which powdered material is compressed into tablets. The rotor of the rotary press is driven by a rotary drive and comprises a die disk 10 having a plurality of cavities 12. The cavities 12 can, for example, be formed by bores in the die disk 10. The rotor further comprises a plurality of upper press rams 14 and lower press rams 16, which rotate synchronously with the die disk 10. The upper press rams 14 are axially guided in an upper ram guide 18, and the lower press rams 16 are axially guided in a lower ram guide 20. The axial movement of the upper press rams 14 and lower press rams 16 during the rotation of the rotor is controlled by upper control cam elements 22 and lower control cam elements 24.Furthermore, a filling device 26 is provided, which has a filling reservoir 28 and a filling chamber 30, which are connected via a filling tube 32. In this way, in the present example, powder material flows from the filling reservoir 28 through the filling tube 32 into the filling chamber 30 by gravity and from there, via a filling opening provided on the underside of the filling chamber 30, again by gravity into the cavities 12 of the die disk 10.

[0027] The rotary press also includes a pressure unit 34. The pressure unit 34 comprises a pre-pressure unit with an upper pre-pressure roller 36 held on an upper support 35 and a lower pre-pressure roller 38 held on a lower support 37, as well as a main pressure unit with an upper pressure roller 40 held on an upper support 39 and a lower pressure roller 42 held on a lower support 41. Furthermore, the rotary press includes a stripping unit 44 with a stripping channel 46. The stripping channel strips tablets 48, which are conveyed onto the upper surface of the die 10 by the lower press rams 16, from the die 10 and conveys the tablets 48 through the stripping channel 46 to a first tablet discharge 58. The stripping channel 46 can, for example, be crescent-shaped and is explained in more detail with reference to the following figures.Furthermore, the rotary press includes a control device 52 for controlling the operation of the rotary press.

[0028] In Figure 2 are from the in Figure 1 For illustrative purposes, only the die 10 with the cavities 12 and the stripping channel 46 of the stripping device 44 are shown in the depicted rotary press. The stripping channel 46 comprises a first section 54 arranged above the die 10 and a second section 56 arranged radially outside the die 10. The stripping channel 46 leads to the first tablet discharge 58, through which, for example, tablets 48 identified as good can be discharged from the rotary press for further processing. In operation, the die 10 rotates counterclockwise, as shown in Figure 2as indicated by arrow 60. In the direction of rotation of the die disk 10 and thus in the conveying direction of the tablets 48 into the stripping channel 46, a second tablet discharge 62 is arranged upstream of the first tablet discharge 58, through which, for example, tablets 48 identified as defective by sensors of the rotary press can be fed to a reject outlet.

[0029] Based on the Figures 3 to 5 The construction of the scraper device 44 according to the invention will be explained in more detail. In the sectional view of the Figure 4Integrated into the stripping channel is a supply channel 64, connected to a pressure supply (not shown) of a compressed gas supply device, through which a compressed gas, in particular compressed air, is supplied to vacuum nozzles of the vacuum device integrated into the stripping channel 46. In the example shown, compressed air is supplied as a pressurized gas from the supply channel 64, which runs parallel to the conveying path of tablets 48 through the stripping channel 46, via a transverse connection 66 to a U-shaped section 68 of the stripping channel 46. The U-shaped section 68 is formed by a first channel wall 70, a second channel wall 72, and a channel cover 74. As shown in particular in Figure 5As can be seen, section 68 leads into several vacuum nozzles 76 arranged along a U-shaped profile. The compressed air supplied via the supply channel 64 is directed through the U-shaped section 68 to the vacuum nozzles 76 and expelled by them in the desired direction of movement of the tablets 48 conveyed through the stripping channel 46. This creates a suction effect on the tablets 48 ejected from the cavities 12 by the lower press plungers 16, in this example already during the ejection process, while the tablets 48 are still at least partially in the cavity 12. As can be seen in particular in Figure 5 As can be further seen, the stripping channel 46 has a discharge chute section 78 as a channel floor in its section located radially outside the die disc 10, via which the tablets 48 conveyed by the suction effect of the vacuum device reach the first tablet discharge 58 by gravity. Figure 5 It can further be seen that several vacuum nozzles 76 are arranged in the first channel wall 70, the second channel wall 72, and the channel ceiling 74. Each vacuum nozzle 76 can have an elongated nozzle section extending in the conveying direction of the tablets 48 towards the first tablet outlet 58, through which the pressurized gas or compressed air is directed. In contrast, the stripping channel 46 in the section 54 located above the die disk 10 has no bottom, so that the space bounded by the first and second channel walls 70, 72, and the channel ceiling 74 is formed on its underside by the die disk 10 rotating beneath the stripping channel 46.

[0030] Also integrated into the scraper channel 46 is a [missing information] in the Figures 4 and 5 hidden and in Figure 3A schematically depicted sorting nozzle 80 is integrated, which is part of a sorting device for removing tablets 48, identified as defective by sensors of the rotary press, for example, into the second tablet discharge 62. A further supply channel 82 is connected to the compressed gas supply and is also integrated into the stripping channel 46, supplying the sorting nozzle 80 with compressed gas, in particular compressed air. By briefly releasing a burst of compressed gas through the sorting nozzle 80, tablets 48 identified as defective can be selectively blown out of their conveying path into the second tablet discharge 62. As can be seen in the figures, the stripping channel 46 extends to the sorting device, in particular the sorting nozzle 80. Specifically, the sorting nozzle 80 is integrated into the stripping channel 46 as explained.

[0031] As already explained, the vacuum device according to the invention, in particular the vacuum nozzles 76, ensures that a suction effect is generated on the tablets 48 even during ejection from the cavities 12 by the lower press plungers 16. Furthermore, the design of the vacuum device, in particular the arrangement of the vacuum nozzles 76, ensures that the tablets 48, ejected from the cavities 12 by the lower press plungers 16 and located on the die disk 10, are exposed to the airflow generated by the vacuum nozzles 76.

[0032] The flow of airflow 84 over a tablet 48 is in Figure 6As illustrated, the overflow exerts two force components on tablet 48: one in the desired direction of movement of tablet 48, as illustrated by arrow 86, and the other vertically upwards, as illustrated by arrow 88. This ensures particularly reliable delivery of the tablets 48. Reference symbol list

[0033] 10 Die disc 12 Cavities 14 Upper press ram 16 Lower press ram 18 Upper ram guide 20 Lower ram guide 22 Upper control cam elements 24 Lower control cam elements 26 Filling device 28 Filling reservoir 30 Filling chamber 32 Filling tube 34 Pressure device 35, 39 Upper supports 37, 41 Lower supports 36 Upper pre-pressure roller 38 Lower pre-pressure roller 40 Upper pressure roller 42 Lower pressure roller 44 Scraper device 46 Scraper channel 48 Tablets, compacts 52 Control device 54 First section 56 Second section 60 Arrow 62 Second compact discharge 64 Supply channel 66 Cross connection 68 Section 70 First channel wall 72 Second channel wall 74 Channel ceiling 76 Vacuum nozzles 78 Discharge chute section 80 Sorting nozzle 82 Supply channel 84 Airflow 86 Arrow 88 Arrow

Claims

1. Rotary press comprising a rotor rotatable by means of a rotary drive, the rotor having an upper punch guide (18) for upper press punches (14) and a lower punch guide (20) for lower press punches (16), and a die disk (10) arranged between the punch guides (18, 20), the press punches (14, 16) interacting with cavities (12) of the die disk (10), the rotary press further comprising a filling device (26) by which powder material to be compressed is filled into the cavities (12) of the die disk (10), and the rotary press comprising a pressure device (34) with an upper pressure unit (40) and a lower pressure unit (42) which, in operation, engage with the upper press punches (14) and with the lower press punches (16) to compress the powder material in the cavities (12) of the die disk (10) into pellets. (48) cooperate,and wherein the rotary press comprises a stripping device (44) for stripping the compacts (48) ejected onto the top of the die (10) after compression by the lower press punches (16), wherein the stripping device (44) has a stripping channel (46) arranged at least partially above the die (10), so that compacts (48) ejected from the cavities (12) onto the top of the die (10) by the lower press punches (16) are guided along the stripping channel (46) from the die (10) to a first compact discharge (58), , characterized by the fact that The section (54) of the stripping channel (46) arranged above the die disk (10) has a vacuum device by which the compacts (48) located on the die disk (10) are sucked along the stripping channel (46) to the first compact discharge (58).

2. Rotary press according to claim 1, characterized by the fact thatThe vacuum device is arranged on the section (54) of the stripping channel (46) located above the die disk (10) in such a way that a suction effect is generated by the vacuum device on the compacts (48) already during ejection by the lower press punches (16) from the cavities (12).

3. Rotary press according to one of the preceding claims, characterized by the fact that The vacuum device is arranged on the section (54) of the stripping channel (46) located above the die disk (10) in such a way that the compacts (48) ejected from the cavities (12) by the lower press rams (16) are overflowed by an airflow (84) generated by the vacuum device.

4. Rotary press according to one of the preceding claims, characterized by the fact that the vacuum device has vacuum nozzles (76) integrated into the section (54) of the wiper channel (46) arranged above the die disk (10).

5. Rotary press according to claim 4, characterized by the fact that Vacuum nozzles (76) are integrated into the section (54) of the stripping channel (46) located above the die disk (10) and are arranged above and / or near the ejection point of the compacts (48) when ejected by the lower press rams (16) from the cavities (12).

6. Rotary press according to one of claims 4 or 5, characterized by the fact that the stripping channel (46) has a first channel wall (70) leading the compacts (48) to the first compact discharge (58) and a channel ceiling (74) covering the stripping channel (46) at least partially, and that vacuum nozzles (76) are arranged in the first channel wall (70) and in the channel ceiling (74).

7. Rotary press according to claim 6, characterized by the fact that the scraper channel (46) further comprises a second channel wall (72) opposite the first channel wall (70), and that vacuum nozzles (76) are also arranged in the second channel wall (72).

8. Rotary press according to claim 7, characterized by the fact that the first channel wall (70), the channel ceiling (74) and the second channel wall (72) form a U-profile.

9. Rotary press according to one of claims 4 to 8, characterized by the fact that the vacuum nozzles (76) each have an elongated nozzle section extending in the conveying direction of the pellets (48) to the first pellet outlet (58), and that a pressurized gas, in particular compressed air, is passed through the elongated nozzle section by the vacuum device.

10. Rotary press according to one of claims 4 to 9, characterized by the fact that the vacuum device comprises a compressed gas supply device, in particular a compressed air supply device, for supplying the vacuum nozzles (76) with compressed gas, in particular compressed air, wherein the compressed gas supply device comprises a supply channel (64) leading along the wiper channel (46) from a compressed gas supply to the vacuum nozzles (76).

11. Rotary press according to claim 10, characterized by the fact that the supply channel (64) is integrated into the scraper channel (46).

12. Rotary press according to one of the preceding claims, characterized by the fact that Furthermore, a sorting device is provided for sorting out the pressed pellets (48) ejected from the cavities (12) into a second pressed pellet outlet (62) upstream of the first pressed pellet outlet (58) in the conveying direction of the pressed pellets (48), wherein the sorting device comprises a sorting nozzle (80) for sorting out pressed pellets (48) into the second pressed pellet outlet (62) by means of compressed gas.

13. Rotary press according to claim 12 and one of claims 10 or 11, characterized by the fact that The sorting nozzle (80) is also supplied with compressed gas via the compressed gas supply.

14. Rotary press according to one of claims 12 or 13, characterized by the fact thatthe stripping channel (46) extends to the sorting device and / or the sorting nozzle (80) is integrated into the stripping channel (46).

15. Rotary press according to one of the preceding claims, characterized by the fact that a first detector device is arranged in the first pellet flow (58) which detects pellets (48) passed through the first pellet flow (58) and / or a second detector device is arranged in a second pellet flow (62) which detects pellets (48) passed through the second pellet flow (58).

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