Assembly and method for extracting laser dust, and machine of the tobacco processing industry, and use
Patent Information
- Application Number
- PCT/EP2026/052876
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-24
- Filing Date
- 2026-02-04
- Publication Date
- 2026-08-27
Smart Images
Figure EP2026052876_27082026_PF_FP_ABST
Abstract
Description
[0001] Arrangement and method for the extraction of laser dust and machinery of the tobacco processing industry, as well as its use
[0002] Description
[0003] The invention relates to an arrangement and a method for extracting laser dust as well as a machine for the tobacco processing industry.
[0004] In the production of rod-shaped articles for the tobacco industry, particularly cigarettes, the air permeability of single or, more commonly, double-length cigarettes, whose filter sticks are encased in a strip of wrapping paper, is adjusted by laser perforation of the wrapping paper strip. Similarly, in the production of heat-not-burn (HNB) products, which are assembled from several segments and wrapped in wrapping paper, sometimes multiple times, the ventilation of the articles is adjusted by laser perforation of the respective wrapping paper, thereby increasing its air permeability. For the purpose of laser perforation, the rod-shaped articles, such as cigarettes or HNB products, are conveyed on a laser drum and perforated by one or more lasers, either from outside or inside the drum.Laser drums, also called laser rolling drums, are part of a system comprising a rotating trough drum with widened troughs and one or more rolling elements, such as roller cams. The base of the widened troughs is designed as a rolling surface, typically featuring transverse ribbing to prevent the articles from slipping during unwinding. The width of the widened troughs usually corresponds to the circumference of the respective article or is slightly larger. During production, the rod-shaped articles are held against one side of a leading wall of a widened trough by suction and conveyed into the area of the rotating, but stationary, roller cams. The circumferential surface of the roller cams can also be ribbed to prevent the articles from slipping.The rotating circumferential surface of the roller cam, at its point of closest approach to the trough drum, is slightly smaller than the diameter of the article. This causes the article to be pressed lightly between the roller cam and the trough's rolling surface. Simultaneously, the roller cam rotates at a circumferential speed that essentially or exactly corresponds to the circumferential speed of the roller drum in the area of the rolling surfaces, parallel to the trough drum and in the same direction of rotation as the drum. This causes the rod-shaped article to rotate in the opposite direction and remain essentially or exactly stationary until, after approximately one complete rotation of 360° or slightly more, the rod-shaped article reaches the trailing wall of the trough and is carried along by it, subsequently held in place by suction.During the rolling process, the rod-shaped article remains in focus of the laser perforation device.
[0005] The generation of laser dust during laser perforation is unavoidable. This is even more true for HNB products than for conventional cigarettes, since the wrapping papers for HNB products have a basis weight of around 80 to 120 g / m². 2 are several times thicker than cigarettes, whose grammage is more in the range of 15 to 30 g / m². 2 Furthermore, the laser-cut perforations penetrate the wrapping paper and reach the underlying material. In the case of cigarettes, this is usually acetate rods, while in HNB products it is more often hollow acetate tubes or paper tubes. Laser cutting into these paper tubes, in particular, results in increased laser dust.
[0006] The perforations in the wrapping paper are typically spaced 1 to 2 mm apart. Simultaneously, several thousand rod-shaped objects must be perforated per minute, requiring a correspondingly high pulse rate and power for the perforation process.
[0007] Due to the extremely rapid heating and high mass throughput, a large quantity of laser dust particles is released from the paper material, particularly in HNB products. These laser dust particles contain sugar, meaning they are at least partially organic, and are therefore highly adhesive (sticky). For this reason, the laser dust accumulates very quickly on the machine components. To prevent this, the laser dust is continuously extracted from the process chamber by an airflow. The aim is to keep the laser optics, the troughs of the laser drum, and the laser drum's control flange (which includes suction air control channels for regulating the suction air in the troughs of the laser drum) as dust-free as possible in the immediate vicinity of the laser perforation point.
[0008] Like the laser perforation itself, the extraction of air contaminated with laser dust particles can also take place from outside or inside the laser drum. For external extraction, an extraction hood is used, for example. The dust extracted from the process chamber is then transported through subsequent components such as pipes or a spark screen, and possibly other flow-related elements and fans, to a central exhaust system. Along this long path, the laser dust can accumulate in any dead-flow area, i.e., area with low flow velocity, and clog the effective cross-sections of the pipes. Depending on the product's ventilation level, this contamination leads to unplanned machine downtime and results in very high cleaning costs.
[0009] The presence of dead water areas can be minimized to a certain extent by optimizing the pipelines, for example by avoiding unnecessary changes in flow cross-section or bends with a tight radius.
[0010] One approach to reducing laser dust agglomeration in the extraction system is shown in DE 102022 134675 A1, according to which the laser dust extraction device has a catalytic afterburner integrated into its piping system. Through catalytic afterburning, the organic components of the laser dust particles are gasified, leaving only the non-combustible inorganic components, which are non-sticky and therefore do not tend to settle in stagnant areas of the piping system. However, this solution is energy-intensive.
[0011] In contrast, the present invention aims to minimize the problem of laser dust agglomeration in the duct system for extracting laser dust from its point of origin or in the laser drums in a simple manner.
[0012] This problem is solved by an arrangement for extracting laser dust from a manufacturing machine in the tobacco processing industry, comprising at least one laser drum configured to convey transversely axially coated, rod-shaped articles of the tobacco processing industry, in particular cigarettes or heat-not-burn products, wrapped with wrapping paper; at least one laser perforation device arranged and configured inside and / or outside the laser drum to perforate the wrapping papers of the rod-shaped articles during operation of the arrangement; and an extraction device configured and arranged to extract air and / or process gas contaminated with laser dust particles from the vicinity of where the rod-shaped articles are perforated during operation of the arrangement, wherein the extraction device comprises a suction air source and an extraction duct system connected to the suction air source.the preferably from an extraction chamber in a control flange of the at least one laser drum, which is designed to extract the laser dust particles from the point of origin of the laser dust particles, to the suction air source, wherein the arrangement is further developed in that the arrangement has at least one auxiliary material supply device, which has a reservoir for a powdered auxiliary material, in particular lime or diatomaceous earth, as well as a portioning device connected to or comprising the reservoir, which is configured to introduce portions of auxiliary material into the extraction chamber via an auxiliary material supply line by means of compressed air pulses.
[0013] In addition to the conventional laser dust extraction system, the setup presented here features an auxiliary material feed unit for a powdered auxiliary material. Suitable powdered auxiliary materials include lime or diatomaceous earth. These are portioned by the feed unit and introduced into the extraction chamber via an auxiliary material feed line using bursts of compressed air. This occurs with the extraction system switched on, so that the air, into which the auxiliary material is introduced, is conveyed through the extraction chamber and the extraction duct system along with the powdered auxiliary material. Due to adhesion, the powdered auxiliary material adheres to the surfaces of the extraction chamber and the extraction duct system and settles as a thin, even layer on the surfaces. One or a few bursts of compressed air are sufficient for this, with the amount required ranging from a few grams to several tens of grams, depending on the system size and the surface area to be covered.The portions produced in this way are preferably smaller than 50 g, more preferably smaller than 30 g, and more preferably smaller than 15 g. The lime or diatomaceous earth in powder form preferably has a particle size between 1 pm and 3 mm, more preferably 10 pm to 300 pm, 15 pm to 200 pm or between 30 pm and 100 pm and / or a density between 1 g / cm³. 3 up to 5 g / cm² 3 preferably between 1.5 and 2.5 g / cm³ 3 , for example 2.0 g / cm² 3 Preferably, the particle size describes the diameter of the smallest enclosing sphere of the particle(s).
[0014] This impregnation of the surfaces with the powder of the auxiliary material means that the sticky laser dust no longer settles and agglomerates on the surfaces of the extraction chamber and the extraction duct system, but instead adheres to the powder of the auxiliary material and bonds with it. The auxiliary material itself, however, is not bonded to the surfaces, but adheres to them only via a much weaker adhesion. The auxiliary material powder, along with the laser dust adhering to it, can therefore be easily and completely removed from the system.
[0015] If laser dust accumulates and clumps together in certain areas, the resulting agglomeration can create resistance to the suction airflow, causing these agglomerations to detach from the surfaces. They are then carried away by the suction airflow. Due to their size, they do not re-adhere to surfaces and can be removed from the airflow using filters or other methods. The area where the agglomeration, along with the powder of the auxiliary material to which it was attached, detaches from the surface is no longer impregnated. Therefore, it is advisable to regularly clean the extraction chamber and / or the extraction duct system and then re-impregnate it with the powdered auxiliary material. Cleaning is significantly faster and more efficient with the use of this auxiliary material.
[0016] In embodiments, part of the auxiliary material supply line runs through the stationary part of the at least one laser drum, in particular through the control flange in which the extraction chamber is located.
[0017] In various embodiments, the extraction system for separating powdered auxiliary material from an extraction air stream comprises a filter unit, a centrifugal separator, and / or a baffle plate. A collection container, such as an ash box, is usually provided with a filter unit, centrifugal separator, or baffle plate. This container collects the particulate material separated from the air stream, i.e., auxiliary material containing laser dust, and can be easily emptied and / or replaced.
[0018] In embodiments, the extraction duct system comprises pipes with a diameter of less than 100mm, in particular less than 80mm, in particular less than 50mm, and / or pipes with a diameter greater than 10mm, in particular greater than 20mm.
[0019] In embodiments, the extraction duct system includes a spark screen and / or a catalytic afterburning unit.
[0020] In some embodiments, two laser drums are included, supplied with auxiliary material by two separate or a common auxiliary material supply unit. Laser dust extraction can also be performed either separately or jointly. A shared auxiliary material supply and laser dust extraction system results in less structural complexity, while separate supply and extraction for the two laser drums can be used, for example, to maintain the operation of one of the two production lines while the other is being cleaned and re-impregnated.
[0021] The problem underlying the invention is also solved by a machine for the tobacco processing industry for the production of rod-shaped articles wrapped in wrapping paper, comprising at least one laser drum with a laser perforation device and an arrangement for extracting laser dust, which is further developed in that the arrangement for extracting laser dust is designed according to the invention as described above. The machine thus fulfills the same properties, features, and advantages as the arrangement described above. In embodiments, a central suction air supply of the machine is also used as the suction air source of the arrangement, or the arrangement has its own suction air source.
[0022] The problem underlying the invention is also solved by a method for extracting laser dust in a manufacturing machine of the tobacco processing industry with a previously described arrangement according to the invention, wherein the surfaces of the extraction chamber and the extraction duct system are impregnated once or several times, in particular by means of additive-laden compressed air pulses from the additive supply device, with a powdered additive, in particular lime or diatomaceous earth, before the start of production, during an interruption of production, or during the ongoing operation of rod-shaped articles wrapped with wrapping paper, in particular cigarettes or heat-not-burn products. The method according to the invention also realizes the same features, properties, and advantages as the arrangement and the machine.
[0023] The impregnation is carried out in embodiments with an impregnation layer thickness of less than 2 mm, in particular less than 1 mm, in particular less than 0.8 mm, and / or greater than 0.4 mm, in particular greater than 0.5 mm, in particular greater than 0.8 mm.
[0024] Preferably, the impregnation process takes place while air is continuously extracted through the extraction system. This ensures that the powdered additive is distributed over the surfaces where laser dust would otherwise settle.
[0025] In some embodiments, one or two pressure pulses containing an additive are released into the extraction chamber at cyclical intervals. The amount of additive per pulse can range from a few grams to several tens of grams. The exact amount can be determined through simple tests by checking whether the surfaces of the extraction duct system and the extraction chamber are sufficiently covered after impregnation. A certain excess may be necessary, which is then removed from the airflow after passing through the extraction duct system. This excess can be reused, possibly after purification, or alternatively, disposed of.
[0026] Preferably, less than one pressure pulse is delivered every 2 hours, in particular less than one pressure pulse per hour, half hour, quarter hour or 10 minutes, and / or the amount of auxiliary material is less than 50 g per hour, in particular less than 30 g per hour or 15 g per hour.
[0027] Preferably, the introduced auxiliary material is separated from the airflow in the extraction duct system via a filter unit, a centrifugal separator and / or a baffle plate.
[0028] In some embodiments, quantities of auxiliary material adhering to the surfaces of the extraction chamber and / or the extraction duct system are extracted in a separate step during a production stoppage before re-impregnation, particularly while the suction air source is not operating. Adhering quantities of auxiliary material can also be loosened from the surfaces to which they adhere using flexible brushes and then extracted.
[0029] Furthermore, the problem underlying the invention is also solved by using a powdered auxiliary material for impregnating the surfaces of an extraction chamber of a laser drum and / or an extraction duct system of a machine in the tobacco processing industry to prevent agglomeration of laser dust. This use also achieves the same properties, features, and advantages of the present invention. The machine can be a previously described machine according to the invention. Preferably, the powdered auxiliary material is lime or diatomaceous earth, in particular with a particle size between 1 pm and 3 mm, preferably 10 pm to 300 pm, 15 pm to 200 pm, or between 30 pm and 100 pm, and / or a density between 1 g / cm³. 3 up to 5 g / cm² 3 preferably between 1.5 and 2.5 g / cm³ 3 , for example 2.0 g / cm² 3Preferably, the particle size describes the diameter of the smallest enclosing sphere of the particle(s).
[0030] Further features of the invention will become apparent from the description of embodiments according to the invention, together with the claims and the accompanying drawings. Embodiments according to the invention may fulfill individual features or a combination of several features.
[0031] The invention is described below, without limiting the general concept of the invention, with reference to exemplary embodiments and the drawings, whereby for all details of the invention not explained in detail in the text, explicit reference is made to the drawings. The drawings show:
[0032] Fig. 1 shows a perspective schematic representation of a known laser drum,
[0033] Fig. 2 shows a schematic representation of an embodiment of an arrangement for extracting laser dust,
[0034] Fig. 3 shows a perspective schematic representation of an embodiment of a laser drum with impregnation,
[0035] Fig. 4 is another perspective schematic representation of parts of the laser drum from Fig. 3, Fig. 5 is a schematic perspective sectional view of the laser drum from Fig. 3 with a horizontal section plane and
[0036] Fig. 6 is a schematic perspective semi-transparent representation of a control flange of the laser drum from Fig. 3 with a vertical section plane.
[0037] Within the scope of the invention, features marked with "in particular" or "preferably" are to be understood as optional features.
[0038] In the drawings, identical or similar elements and / or parts are provided with the same reference numbers, so that a re-presentation is omitted.
[0039] Fig. 1 shows a perspective schematic representation of a known laser drum 12. This drum is attached to the wall of a machine (not shown) via a connecting piece 14. A central stationary part 30 extends from this part, on which a trough drum 20, driven by a drive shaft (not shown), is rotatably mounted. The trough drum 20 is closed by an end cap 21 and has wide troughs 22 on its circumferential surface. These troughs are separated from each other by trough walls 24, into which suction air openings 25 are recessed. As long as rod-shaped articles are in contact with one of the trough walls 24, they are held against the respective trough wall 24 by the suction air present at the suction air openings 25. Between the trough walls 24 are rolling surfaces 26, the circumferential width of which corresponds to the circumference of the rod-shaped articles (not shown) held on them.
[0040] Above the trough drum 20 is a laser perforation device 16, which perforates the articles (not shown) from the outside using laser pulses. For this purpose, the articles are rotated around their axis in the troughs 22 by means of roller cams 29. The roller cams 29 are stationary and rotate around their own axes. In doing so, they press lightly against the articles so that they remain in place during their rotation until they are carried along by the subsequent trough wall 24. Figure 1 shows two aligned roller cams 29 with a gap between them through which the laser perforation device 16 has access to the rod-shaped articles. These could, for example, be double-length cigarettes, with the roller cams 29 pressing on the outer areas of the articles, while the middle area is processed by the laser perforation device 16.
[0041] The trough drum 20 also has slot-shaped openings 28 on its outer surface, through which dust-laden air enters the interior of the trough drum 20 and is extracted there. The extracted air passes through an extraction chamber (not shown) to an extraction outlet 42, to which further extraction pipes are connected. The extraction chamber and the suction air channels inside the trough drum 20, which lead to the outlet 42, are arranged in a stationary part of the trough drum 20, the control flange, which is obscured in perspective in Fig. 1.
[0042] Fig. 2 shows a schematic representation of an embodiment of an arrangement 10 for extracting laser dust, in a version with a double-strand operation with two parallel-operated laser drums 12. Each of the laser drums 12 is assigned its own laser perforation device 16. The operation of the laser drums 12 is essentially as shown in Fig. 1 and described therein.
[0043] The arrangement 10 has an extraction device 40, which has an extraction pipe 44 leading to each laser drum 12. Both pipes open into a separating screen 46, where coarse particulate matter is removed from the airflow. Downstream of the separating screen 46 is a filter unit 47 with an ash box 48 located below it, which separates the finer particles present in the airflow. The ash box 48 can be emptied and reinserted or replaced. Finally, the suction air reaches a suction air source 49, which creates a negative pressure and thus initiates a suction airflow through the extraction device 40.
[0044] Furthermore, the arrangement 10 has an auxiliary material supply device 50, which includes a portioning device 52 and an auxiliary material supply line 54 that splits into two partial supply lines. The portioning device 52 can have several parts, for example, a reservoir for the powdered auxiliary material, a portioner configured to receive individual portions of the auxiliary material and dispense them from the reservoir, and a source of compressed air pulses configured to generate individual compressed air pulses to introduce a portion of the auxiliary material into the control flanges 32 of the laser drums 12. Meanwhile, the suction air source 49 operates, drawing the auxiliary material into the extraction device 40 and impregnating the inner surfaces in the control flange 32 and the extraction device 40.The particles of the additive adhere to the surfaces through adhesion, forming a continuous layer that can be one or more particle diameters thick. This can occur during maintenance breaks and / or during the machine's ongoing production operation.
[0045] After production resumes, laser dust enters the interior of the laser drums 12 via suction air, as before, and is extracted. However, the laser dust now has more readily available surfaces for settling and adhering to the auxiliary material layer than to the respective control flange 32 and the extraction device 40. The laser dust particles now bond with this adhering auxiliary material powder, which also offers a large specific surface area. Further laser dust can settle on top of the already adhering laser dust and bond with it further. During a maintenance interval, the laser dust that has settled on the auxiliary material powder can be easily and completely removed. Fig. 3 shows a perspective schematic representation of an exemplary embodiment of a laser drum 12 with the option of impregnation. In many respects, this laser drum 12 is comparable to the one in Fig.1, in particular with regard to the troughs 22. In addition, it is shown in this respect, using the example of the upper troughs, that these have a ribbing 27 which prevents the rod-shaped articles transported on them from slipping off during rolling. The roller cams can also have a corresponding ribbing.
[0046] In the stationary section 30, the trough drum 20 has, in addition to the outlet 42 for extraction, an auxiliary material supply line 54, which can be connected to the auxiliary material supply device 50 from Fig. 2. Auxiliary material can be blown into the trough drum 20 through the auxiliary material supply line 54 and distributed within the trough drum 20 by the extraction system and the extraction device 40 with downstream lines, filters, etc.
[0047] Fig. 4 shows another perspective schematic view of parts of the laser drum 12 from Fig. 3. In this view, the outer rotating trough drum 20 has been removed, revealing the inner drum 34, which is rotatably mounted on a cylindrical part 33 of the control flange. Furthermore, the interior of the inner drum 34 is revealed by a section in a vertical plane perpendicular to the central axis of the drum. This plane passes through a control flange 32 located inside the inner drum 34, in which an extraction chamber 41 is visible in the cross-sectional view. The control flange 32 is stationary and does not rotate. The extraction chamber 41 primarily serves to extract the laser dust generated during the perforation of the wrapping paper and / or segments, such as paper tubes, of the rod-shaped articles.For this purpose, the extraction chamber 41 is open to the surface of the trough drum 20 through the slot-shaped openings 28. Additionally, an auxiliary material inlet 56 opens into the extraction chamber 41, which is connected via an auxiliary material supply line 54 to an auxiliary material feed device 50, as shown by way of example in Fig. 2. Auxiliary material, in particular powdered lime or diatomaceous earth, enters the extraction chamber 41 in pulses through the auxiliary material inlet 56 and is carried along by the airflow generated by a suction air source. The airflow containing the auxiliary material exits the laser drum 12 through the outlet 42 and enters the extraction device, as shown by way of example in Fig. 2.
[0048] Fig. 5 shows a schematic perspective sectional view of the laser drum 12 from Fig. 3 with a horizontal section plane that is offset vertically upwards to the drum's axis of rotation and runs through the auxiliary material supply line 54 in the control flange, which opens into an auxiliary material inlet 56 to the extraction chamber 41. Only the first part of the extraction chamber 41 is visible in the section; the remainder runs inside the control flange 32 to the outlet 42.
[0049] Fig. 6 shows a schematic, perspective, semi-transparent view of a control flange of the laser drum from Fig. 3 with a vertical section plane. The routing of the auxiliary material supply line 54 inside the control flange 32 to the auxiliary material inlet 56 leading to the extraction chamber 41 is also clearly visible. This line is arranged in a large, rounded L-shape within the control flange 32 and terminates in the outlet 42. Sections of the auxiliary material supply line can be flanged to the control flange or other parts of the drum as separate components.
[0050] All features mentioned, including those discernible from the drawings alone as well as individual features disclosed in combination with other features, are considered essential to the invention, both individually and in combination. Inventory embodiments can be fulfilled by individual features or a combination of several features. (List of references)
[0051] 10 Arrangement
[0052] 12 Laser drum
[0053] 14 connection spigots
[0054] 16 Laser perforation device
[0055] 20 trough drum
[0056] 21 End cap
[0057] 22 troughs
[0058] 24 trough wall
[0059] 25 Suction air opening
[0060] 26 Rolling area
[0061] 27 ribbing
[0062] 29 roller cams
[0063] 28 slotted openings
[0064] 30 central stationary part
[0065] 32 Control flange
[0066] 33 cylindrical part of the control flange 34 inner drum
[0067] 40 Extraction system
[0068] 41 Extraction chamber
[0069] 42 Outlet for extraction
[0070] 44 Suction pipe
[0071] 46 Separation sieve
[0072] 47 filter units
[0073] 48 ash boxes
[0074] 49 Suction air source
[0075] 50 Auxiliary material supply unit
[0076] 52 Portioning device
[0077] 54 Auxiliary material supply
[0078] 56 Auxiliary material inlet
Claims
Arrangement and method for the extraction of laser dust and machinery of the tobacco processing industry, as well as its use Patent claims 1. Arrangement (10) for extracting laser dust in a manufacturing machine of the tobacco processing industry, comprising at least one laser drum (12) configured to convey transversely axially rod-shaped articles of the tobacco processing industry, in particular cigarettes or heat-not-burn products, wrapped with wrapping paper; at least one laser perforation device (16) arranged and configured inside and / or outside the at least one laser drum (12) to perforate the wrapping papers of the rod-shaped articles during operation of the arrangement; an extraction device (40) configured and arranged to extract air and / or process gas contaminated with laser dust particles from the vicinity of the location where the rod-shaped articles are perforated during operation of the arrangement (10), wherein the extraction device (40) comprises a suction air source (49) and an extraction line system connected to the suction air source (49), characterized in thatthat the arrangement comprises at least one auxiliary material supply device (50) which has a reservoir for a powdered auxiliary material, in particular lime or diatomaceous earth, and a portioning device (52) connected to or comprising the reservoir, which is configured to introduce portions of auxiliary material into the extraction chamber (41) via an auxiliary material supply line (54) by means of compressed air pulses.
2. Arrangement (10) according to claim 1, characterized in that the extraction line system leads from an extraction chamber (41) in a control flange (32) of the at least one laser drum (12), which is designed to extract the laser dust particles from the place of origin of the laser dust particles, to the suction air source (49).
3. Arrangement (10) according to claim 1 or 2, characterized in that a part of the auxiliary material supply line (54) runs through the stationary part of the at least one laser drum (12).
4. Arrangement (10) according to one of claims 1 to 3, characterized in that the extraction line system for separating powdered auxiliary material from an extraction air stream comprises a filter unit (47), a centrifugal separator and / or a baffle plate.
5. Arrangement (10) according to one of claims 1 to 4, characterized in that the extraction line system comprises pipes with a diameter of less than 100mm, in particular less than 80mm, in particular less than 50mm, and / or pipes with a diameter greater than 10mm, in particular greater than 20mm.
6. Arrangement (10) according to one of claims 1 to 5, characterized in that the extraction line system comprises a spark screen and / or a catalytic afterburning unit.
7. Arrangement (10) according to any one of claims 1 to 6, characterized in that it comprises two laser drums (12) which are supplied with auxiliary material by two separate or a common auxiliary material supply device (50).
8. Machine for the tobacco processing industry for the production of rod-shaped articles wrapped with wrapping paper, comprising at least one laser drum (12) with a laser perforation device (16) and an arrangement (10) for extracting laser dust, characterized in that the arrangement (10) for extracting laser dust is configured according to any one of claims 1 to 7.
9. Machine of the tobacco processing industry according to claim 8, characterized in that a central suction air supply of the machine is also used as a suction air source (49) of the arrangement (10) or that the arrangement (10) has its own suction air source (49).
10. Method for extracting laser dust in a manufacturing machine of the tobacco processing industry with an arrangement (10) according to one of claims 1 to 5, characterized in that surfaces of the extraction chamber (41) and the extraction line system are impregnated once or several times, in particular by means of additive-laden compressed air pulses from the additive supply device (50), with a powdered additive, in particular lime or diatomaceous earth, before the start of production, during an interruption of production or during the ongoing operation of rod-shaped articles wrapped with wrapping paper, in particular cigarettes or heat-not-burn products.
11. Method according to claim 10, characterized in that the impregnation is carried out with an impregnation layer thickness of less than 2 mm, in particular less than 1 mm, in particular less than 0.8 mm, and / or greater than 0.4 mm, in particular greater than 0.5 mm, in particular greater than 0.8 mm.
12. Method according to claim 10 or 11, characterized in that the impregnation takes place while air is continuously extracted through the extraction line system.
13. Method according to one of claims 10 to 12, characterized in that one or two auxiliary substance-loaded pressure pulses are released into the extraction chamber (41) at cyclical intervals, in particular less than one pressure pulse per 2 hours, in particular less than one pressure pulse per hour, half hour, quarter hour or 10 minutes, and / or with an amount of auxiliary substance of less than 50 g per hour, in particular less than 30 g per hour or 15 g per hour.
14. Method according to one of claims 10 to 13, characterized in that the introduced auxiliary material is separated from the airflow in the extraction line system via a filter unit (47), a centrifugal separator and / or a baffle plate.
15. Method according to one of claims 10 to 14, characterized in that quantities of auxiliary material adhering to the surfaces of the extraction chamber (41) and / or the extraction line system are extracted in a separate step during a production stoppage prior to re-impregnation, in particular while the suction air source (49) is not operating.
16. Use of a powdered auxiliary substance for impregnating surfaces of an extraction chamber (41) of a laser drum (12) and / or an extraction duct system of a machine in the tobacco processing industry to prevent agglomerations of laser dust.
17. Use according to claim 16, characterized in that the powdered auxiliary material is lime or diatomaceous earth, in particular with a particle size between 1 pm and 3 mm, preferably 10 pm to 300 pm, 15 pm to 200 pm or between 30 pm and 100 pm and / or a density between 1 g / cm³ 3 up to 5 g / cm² 3preferably between 1.5 and 2.5 g / cm³ 3 , for example 2.0 g / cm² 3 . 21