Tobacco filter and tobacco product with smoking material or pre-rolled coil for receiving smoking material, encompassing the tobacco filter

Abstract

A smoking material filter (1) comprising a filter sleeve (5), a granular filter medium (2) arranged therein, characterized in that a first closure element (4) at a first end of the filter sleeve (5) is designed as a cellulose-containing plug and / or a smoking material (23) with smoking material (24) or pre-rolled coil for receiving smoking material (24), each comprising the smoking material filter (1).

Description

[0001] The present invention relates to a tobacco filter and a tobacco product with tobacco or a pre-rolled coil for receiving tobacco comprising the tobacco filter.

[0002] Tobacco products within the meaning of the present invention are preferably, but not exclusively, cigarettes, cigars, cigarillos and / or joints. Such tobacco products may include, among others, tobacco or cannabis products.

[0003] Pre-rolled coils are also referred to as blunts or pre-rolled blunts in the field of application.

[0004] Tobacco products are predominantly used for recreational purposes. To avoid negative health effects, activated carbon filters have recently been used to filter pollutants from the smoke. An example of such an activated carbon filter is described, among other places, in DE 10 2023 103 671 A1. This activated carbon filter has proven effective. It features end ceramic plugs with smoke guide channels.

[0005] The advantage of this filter technology is that it does not use environmentally harmful plastic filter materials, such as cellulose acetate. Activated carbon filters with cellulose acetate end caps are also known. These are referred to below as cellulose acetate filters. Cellulose acetate filters are harmful to the environment. Approximately 10% of the world's microplastics originate from decomposed cellulose acetate from cigarette filters. Therefore, cellulose acetate filters are subject to mandatory labeling for environmental reasons. They have a half-life of 250 years. Another disadvantage of cellulose acetate filters is that when used in joints, a certain "loss" of the active ingredient THC has been observed due to double filtration through two cellulose acetate end caps. This reduces the quality of the product.

[0006] Activated carbon filters with ceramic end caps, on the other hand, have the disadvantage that fine dust particles can detach from the carbon fragments in the carbon filling if they are transported or stored improperly. These particles can then, under certain circumstances, enter the lungs of the user when inhaling through the activated carbon filter.

[0007] The object of the present invention is therefore to provide a tobacco product filter which reduces or completely eliminates the aforementioned disadvantages.

[0008] The present invention solves this problem by providing a tobacco product filter with the features of claim 1.

[0009] A tobacco filter according to the invention comprises a filter sleeve, a granular filter medium arranged therein, and a first closure element, which is arranged at a first end of the filter sleeve. The closure element is designed as a cellulose-containing plug. This plug preferably contains a filler that comprises at least 50 wt.% cellulose.

[0010] Unlike the cellulose acetate mentioned earlier, cellulose is typically a naturally occurring product. This allows the cellulose to be used without altering the chemical structure of the polysaccharide, and in particular without acetylation of individual hydroxyl groups.

[0011] Since cellulose, unlike cellulose acetate, is significantly more biodegradable in nature, the smoking filter made from it is much more environmentally friendly.

[0012] The invention can be implemented in two preferred variants.

[0013] In a first embodiment of the invention, it is particularly preferred if a second closure element at a second end of the filter sleeve is designed as a ceramic plug.

[0014] Alternatively, it is also possible if a second closure element at a second end of the filter sleeve is also designed as a cellulose-containing plug, which has a filler that has at least 50 wt.% cellulose and which is particularly preferably identical to the first closure element.

[0015] The first variant is particularly preferred because, unlike the usual market strategy for activated carbon filters, a ceramic plug is used as a sealing element to close the second end of the filter sleeve.

[0016] In the field of tobacco filtering, the prevailing philosophy, for reasons of ease of handling, has been to use identical end caps on both sides of activated carbon filters. This invention achieves a novelty by combining two end caps with completely different material properties. While a ceramic cap is a rigid material, a cellulose-containing plug exhibits high material flexibility. Therefore, combining these two plug types and fixing them in a filter sleeve is challenging. However, extensive testing has surprisingly demonstrated that combining both plug types in a single activated carbon filter is indeed possible.

[0017] At the same time, unlike pure fiber material, the smoking material can be smoked until the end or until the smoking material is completely consumed, whereas otherwise the embers can transfer to the fiber material.

[0018] The second option has the advantage that both closure elements are highly biodegradable. However, the disadvantage is that it is not recommended to smoke the tobacco product all the way to the filter, as the cellulose is flammable due to the embers, resulting in increased smoke production.

[0019] Advantageous embodiments of the invention are the subject of the dependent claims.

[0020] Preferably, one or both of the end-arranged closure elements are held in the filter sleeve without adhesive. This can preferably be achieved by an interference fit, by friction, or by a combination of both.

[0021] Furthermore, it is preferred that the length of the ceramic plug in the direction of the longitudinal axis A of the filter is less than its maximum outer diameter. This has the advantage of optimized flow characteristics and a more compact filter design.

[0022] In the case of a cellulose-containing plug, only a lesser contact force can be generated. Here, a more robust sealing action comes into play. For improved frictional sealing and thus a correspondingly better fit in the filter sleeve, it is advantageous if the length of the cellulose-containing plug, in the direction of the filter's longitudinal axis A, is greater than its maximum outer diameter.

[0023] The optimal dimensions with regard to length to outer diameter are therefore contrary for the ceramic plug compared to the cellulose-containing plug.

[0024] The cellulose-containing plug can advantageously comprise a filler containing at least 70% by weight, and particularly preferably at least 90% by weight, of cellulose. This filler can be biocellulose. The filler can be designed as a sheet filter medium. This can be bundled by the filter sleeve itself or by an additional sleeve with a maximum extent along the longitudinal axis of the cellulose-containing plug. The bundling and orientation of the sheet filter medium can be such that its filter surface extends substantially parallel to the longitudinal axis and, due to the irregular bundling or folding, has smoke guide channels that extend substantially parallel to the longitudinal axis of the filter. Accordingly, the edges of the sheet filter medium form the end faces of the cellulose-containing plug.

[0025] The aforementioned sleeve can preferably be designed as a paper sleeve, which fits friction-fit against the filter sleeve. The filter sleeve itself can also be made of paper. This is not only environmentally friendly, but also ensures a particularly good frictional fit due to the paper fibers.

[0026] The filling material can be made particularly advantageously from a cellulose material, preferably from a biodegradable cellulose material, especially preferably from biocellulose.

[0027] Particularly acceptable airflow characteristics are achieved when the filling material has a density of less than 0.5 g / cm³. 3 exhibits a good compromise between filter efficiency and airflow characteristics in the range between 0.18 and 0.33 g / cm³. 3 and especially optimized between 0.22 and 0.29 g / cm² 3 .

[0028] Further optimized against blockage, the ceramic plug can have at least three smoke guide channels of different lengths.

[0029] For particularly good environmental compatibility, it is recommended that the granular filter medium be designed as active granules, preferably based on non-fossil plant components such as coconut shells or olive kernels.

[0030] The use of the cellulose-containing plug allows for the use of a finer first particle size distribution between 3-8 mesh in the middle particle size diameter and thus an increased filter surface area, as the risk of fine dust being released is no longer present.

[0031] For additional retention, the activated carbon granules can include a second grain size range of 8-16 mesh in the middle grain diameter.

[0032] The first and / or second particle size distributions can each be present in the activated carbon granules to at least 20 wt.%, preferably at least 35 wt.%.

[0033] Ideally, the length of the cellulose-containing plug is chosen such that it is at least 10% greater, preferably 30-50% greater, than the maximum outer diameter of the cellulose-containing plug.

[0034] The ceramic plug has several smoke guide channels in a manner known per se. For further improved airflow, the end face of the ceramic plug can have a recessed groove, wherein the terminal openings of at least a first group of the smoke guide channels extend into the recessed groove.

[0035] The terminal openings of at least different groups of smoke ducts can have different diameters and / or extend in certain areas on different cross-sectional planes of the ceramic plug perpendicular to the longitudinal axis.

[0036] The ceramic plug can have at least three different groups of smoke guide channels, which differ from each other in terms of their mean length and / or in terms of the opening cross-section of the terminal opening.

[0037] For easier handling, the tobacco filter may have a marking to indicate a mouth side and a contact side with the tobacco, in particular a label to describe both sides.

[0038] The cellulose-containing stopper consists of at least 50% by volume, preferably at least 70% by volume, and particularly preferably at least 90% by volume, of cellulose. Even though the cellulose in question has a low weight, for example compared to a carrier material such as a paper tube, it nevertheless occupies the majority of the space for sealing the bulk filter.

[0039] Furthermore, according to the invention, a smoking product with a smoking material or a pre-rolled coil for receiving a smoking material is provided. The smoking product and the coil comprise a smoking product filter according to the invention. The ceramic plug of the smoking product filter is in contact with the smoking material or it is arranged at the bottom of a receiving chamber of the coil for receiving the smoking material. In both cases, the cellulose-containing plug of the smoking product filter according to the invention is located on the corresponding mouth side of the smoking product or coil.

[0040] The invention is described in more detail below with reference to one embodiment. The invention is not limited to the exemplary embodiment shown. In particular, individual design features from the exemplary embodiment can also be transferred to other embodiments of the invention not shown. The figures show: Fig. 1 Schematic representation of a tobacco filter according to the invention; and Fig. 2 Schematic representation of a smoking product according to the invention.

[0041] Fig. Figure 1 shows a tobacco filter 1 comprising a filter medium 2 and two terminal plug-like closure elements 3 and 4.

[0042] The tobacco filter 1 also includes a filter tube 5. This can be cylindrical or conical. The filter tube can be made of filter paper. This paper can be bleached, unbleached, colored, and / or multicolored. The diameter and / or length of the filter tube 5 can vary.

[0043] Filter sleeve 5 can contain a granular filter medium. This granular filter medium comprises or is made of activated carbon. The activated carbon is based on coconut shells. Alternatively or additionally, activated carbon derived from natural, non-fossil plant components, such as olive pits, can be used. Extraction from fossil sources, particularly coal, is also conceivable.

[0044] The preferred particle size distribution can vary. At least two particle sizes can be used: a first with a mean diameter of 3-8 mesh and a second with a mean diameter of 8-16 mesh. Using two different particle sizes prevents clogging caused by the larger particle size and simultaneously increases the effective filter surface area with the smaller particle size. The filtration efficiency, or effective surface area, as the smoke passes through the tobacco filter can be adjusted by changing the ratio of the two particle sizes.

[0045] At the same time, the mixing ratio also determines the residence time of the smoke in the tobacco filter and the heat transfer to the filter medium. Adjusting the residence time reduces the temperature of the smoke as it hits the outlet-side sealing element.

[0046] The first of the two closure elements 3, which is the outlet-side closure element, is designed as a cellulose-containing plug, while the second of the two closure elements 4, which is the inlet-side closure element, is designed as a ceramic plug. The cellulose-containing plug 3 comprises a filler material 21, which preferably contains at least more than 70 wt.%, and particularly preferably more than 90 wt.%, cellulose. The closure element 3 particularly preferably comprises a sleeve 20, e.g., made of paper, and the filler material 21 arranged therein. The sleeve is merely optional; the plug-like closure element 3 can also be formed exclusively from the filler material. The filler material 21 can advantageously be in the form of cellulose. The filler material 21 can be designed as a sheet filter medium, e.g., as a filter belt, in particular as a cellulose belt, which is bundled by the sleeve 20 to form the cylindrical cellulose-containing plug 3.The outer edges 18 of the bundled filter tape form the two end faces 17 of the plug 3. The bundling creates folded edges of the filter tape extending longitudinally to the cellulose-containing plug 3, and adjacent smoke guide channels 22 also extending longitudinally to the plug. These irregularly shaped smoke guide channels 22 have a comparatively large filter surface area due to the bulky material.

[0047] By selecting the appropriate closure element and positioning the smoking material filter within the smoking product, the product, such as a joint, can be smoked to completion, as the ceramic on one side is heat-resistant. The ceramic closure element must be oriented towards the inlet, i.e., towards the ember. Fine dust filtration on the other side is more effective than with the ceramic closure element due to the cellulose-containing plug. This side with the closure element must be positioned towards the outlet, i.e., towards the mouth, within the smoking product.

[0048] Unlike other filters, the placement of the smoking product filter within a smoking product, such as a joint, cigarette, cigar, or pipe, must be taken into account. Preferably, the smoking product filter may have a marking to indicate the direction of insertion. This can advantageously be a label or a color marking.

[0049] The cellulose-containing stopper 3 is preferably made predominantly by volume or entirely from a natural and biodegradable cellulose material, and particularly preferably from biocellulose. It is biodegradable. It can be provided with a sleeve, e.g., made of paper.

[0050] The entire tobacco filter 1 can preferably be designed to be flame-resistant and tasteless, i.e., have no inherent taste.

[0051] The ceramic stopper 4 is preferably conical. Advantageously, the tobacco filter 1 comprises a sleeve 5 in which the two closure elements 3 and 4 are arranged at the ends. The sleeve 5 can preferably be cylindrical. The sleeve 5 can be made of paper or plant material and have a space between the closure elements 3 and 4 for the filter medium.

[0052] Carbon, for example activated carbon, especially from a natural resource such as coconut, can be used as the filter medium 2. The activated carbon can be in granular form inside the sleeve 5. A detailed description of the ceramic plugs 4 follows below. Fig. 2 explained in more detail.

[0053] The ceramic plug 4 used in the smoke filter 1 is heat-resistant. Each ceramic plug 4 preferably consists of a ceramic body. The ceramic material used is preferably an open-pored ceramic, e.g., a fired product made from ground soapstone. Furthermore, the ceramic plug has smoke guide channels 6. In the ceramic plug 4, the smoke guide channels 6 extend from an outer surface 7 of the smoke filter 1, which contacts the smoke medium, to an inner surface 8, which contacts the filter medium. Preferably, some, and preferably all, of the smoke guide channels 6 are arranged parallel to the longitudinal axis A of the ceramic plug 2.

[0054] Preferably, one of the two sealing plugs is held in the filter sleeve 5 by an interference fit without adhesive. Particularly preferably, both the ceramic plug 4 and the cellulose-containing plug 3 are arranged in the filter sleeve 5 by an interference fit, preferably without the use of adhesives.

[0055] The cellulose-containing stopper can be held in place by friction, either as an alternative or in addition to the press fit. In this case, the stopper is frictionally engaged with the paper material of the sleeve 20 or the filling material 21 itself against the paper material of the filter sleeve 5.

[0056] The retention of the cellulose-containing plug 3 in the filter sleeve 5 can therefore be achieved by an oversize fit and / or by frictional engagement.

[0057] The adhesive-free retention of both sealing elements 3 and 4 in the filter sleeve 5 not only simplifies the processing, but is also particularly environmentally friendly. With this design, the tobacco filters can decompose more easily into their constituent parts, and the biodegradable components can dissolve more readily.

[0058] Both closure elements 3 and 4 are preferably arranged rotationally symmetrically around a longitudinal axis, with only one closure element 3 or 4 being arranged at each end of the filter sleeve 5.

[0059] For effective frictional engagement and secure retention of the cellulose-containing plug in the filter sleeve, and for optimal filtration, it is recommended that the length of the cellulose-containing plug 3 along its longitudinal axis be greater than its maximum outer diameter. It is particularly preferred that the length of the cellulose-containing plug 3 be at least 10% greater, and preferably 30-50% greater, than its maximum outer diameter.

[0060] Furthermore, a particular focus of the development of the tobacco filter 1 according to the invention lies in optimizing the airflow characteristics of the closure elements. While the airflow characteristics can be optimized by the number, length, and arrangement of the smoke channels in the case of the ceramic stopper, the airflow characteristics of the filling material of the cellulose-containing stopper can be optimized, among other things, by selecting the bulkiness or density of the filling material. The optimal density for the filling material 21 of the cellulose-containing stopper, when arranged in the tobacco filter 1, can be less than 0.5 g / cm³. 3 and preferably between 0.18 and 0.33 g / cm³ 3 and particularly preferably between 0.22 and 0.29 g / cm³ 3 The latter range represents a particularly good compromise between the airflow behavior of test subjects and a filter effect determined visually on the filter medium.

[0061] In particular, the adhesive-free fixation of the cellulose filter by extending it longitudinally larger than the maximum outer diameter is advantageous for increasing the friction surface. This is because an excessively tight fit of the cellulose plug, unlike with a ceramic plug, causes compression of the filling material 21, resulting in a change in the filling material's density. This impairs the airflow and smoking experience, and in the worst case, the tobacco filter can become completely blocked in the area of ​​the cellulose plug 3. The aforementioned dimensions and densities represent a good compromise between all boundary conditions and were determined through extensive testing.

[0062] In contrast, for optimal airflow behavior of the ceramic plug 4 and space distribution of the tobacco filter, it is recommended that the length of the ceramic plug extending along the longitudinal axis is less than the maximum outer diameter of the ceramic plug 4.

[0063] The smoke guide channels 6 have a preferred mean diameter of more than 0.9 mm. One smoke guide channel 6a is arranged along the longitudinal axis A of the smoke filter. All other smoke guide channels are arranged on a single circular path 10 around the longitudinal axis A, the center of which lies on the longitudinal axis A. In the Fig. 2 and Fig. In the variant shown in Figure 3, six smoke guide channels 6 are arranged along the circular path 10. These smoke guide channels 6 are preferably arranged equidistant from each other on a plane perpendicular to the longitudinal axis A. The ceramic plug 4 particularly preferably has at least one conical outer surface 9. Particularly preferably, two outer surfaces 9 and 11 arranged one behind the other along the longitudinal axis A of the ceramic plug 4 with different angles of inclination can be provided.

[0064] The first lateral surface 11, which terminates in the outer surface 7, is cylindrical or has a smaller angle of inclination than the adjacent second lateral surface 9, which terminates in the inner surface 8. A further special feature of the design of the ceramic plugs 4 is the arrangement of a recessed groove 13 in the outer surface 7 of the ceramic plug.

[0065] Each recessed groove 13 has a base surface 19.

[0066] A special feature of the smoke ducts 6 is their different lengths. The central smoke duct 6a has an opening 16 which extends exclusively along the floor surface 19.

[0067] A second group of smoke ducts 6b has openings 15, each of which extends partially along a section plane S1 perpendicular to the longitudinal axis A. The openings 15 are also arranged, at least partially, on the floor surface 19. Thus, the opening 15 is located between the floor surface and the section plane S1.

[0068] A third group of smoke guide channels 6c has openings 14, each of which extends in sections along a cutting plane S2 above the cutting plane S1, which also forms the end face of the ceramic plug.

[0069] Thus, the openings 14 and 15 run at least partially along two or more other parallel cutting planes S1 and S2 through the longitudinal axis A.

[0070] As a consequence of the preceding description, the lengths of the smoke ducts 6a-6c are different.

[0071] Tests with various participants revealed a significant improvement in the smoking experience with the smoking filter, particularly when using cannabis smoking products. This is evident, among other things, in a changed perception of the smoke in the throat area during inhalation.

[0072] Visually perceptible is a distinct coloration of the outlet-side cellulose or the outlet-side pulp as filler material due to the filtered pollutants.

[0073] Fig. Figure 2 shows a smoking device 23 according to the invention with a smoking material 24. It can be seen that the ceramic stopper is in contact with the smoking material 24. This allows the embers to penetrate to the filter when the smoking device is consumed, thus ensuring complete combustion of the smoking material.

[0074] In another unillustrated, but inferred from the context of the Fig. 1 and Fig. 2. In a readily understandable variant according to the invention, a tobacco filter is formed on the second side with a cellulose-containing plug instead of a ceramic filter.

[0075] Other materials can include adhesives, absorbents, or a support element, such as a paper framework. The term "filler" has no meaning in this context from the textile industry. Preferably, the cellulose material can be partially or entirely derived from cotton.

[0076] However, this material is compacted before being used in the manufacture of the sealing element to prevent accidental removal during suction. Therefore, the filling material is preferably composed of at least 50% or more compressed cotton by volume. Reference sign 1 tobacco filter 2 Filter medium 3. Closure element / cellulose-containing stopper 4. Closure element / ceramic plug 5 filter sleeves 6 Smoke duct 6a-6c Smoke ducts 7 Outside 8 Inside 9 Surface area 10 circular track 11 Surface area 13 Indentation groove 14 Opening 15 Opening 16 Opening 17 Front 18 edge 19 floor area 20 sleeve 21 Filling material 22 Smoke duct 23 Tobacco products 24 smoking materials A Longitudinal axis S1 cutting plane S2 section plane QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2023 103 671 A1

[0004]

Claims

[1] Tobacco filter (1) comprising a filter sleeve (5), a granular filter medium (2) arranged therein, characterized by , that a first closure element (4) at a first end of the filter sleeve (5) is designed as a cellulose-containing plug. [2] Tobacco filter according to claim 1, characterized by , that a second sealing element is designed as a ceramic plug at a second end of the filter sleeve. [3] Tobacco filter according to claim 1, characterized by , that a second closure element at a second end of the filter sleeve is designed as a cellulose-containing plug which has a filler (21) which has at least 50 wt.% cellulose and which is particularly preferably designed identically to the first closure element. [4] Tobacco filter according to any one of the preceding claims, characterized by, that one of the closure elements (3, 4), preferably both end-arranged closure elements (3, 4), are held in the filter sleeve (5) without adhesive, preferably by an interference fit and / or by friction fit. [5] Tobacco filter according to claim 1, 2 or 4, characterized by , that the length of the ceramic plug (4) in the direction of the longitudinal axis (A) of the tobacco filter (1) is less than its maximum outer diameter. [6] Tobacco filter according to any one of the preceding claims, characterized by , that the length of the cellulose-containing plug (3) in the direction of the longitudinal axis (A) of the tobacco filter (1) is greater than its maximum outer diameter. [7] Tobacco filter according to any one of the preceding claims, characterized by , that the cellulose-containing plug (3) comprises a filler (21) comprising at least 50 wt.%, preferably at least 70 wt.%, particularly preferably at least 90 wt.%, cellulose. [8] Tobacco filter according to any one of the preceding claims, characterized by that the filler (21) is designed as a bundled area filter medium, the filter area of ​​which is arranged essentially parallel to the longitudinal axis (A). [9] Tobacco filter according to any one of the preceding claims, characterized by , that the edges (18) of the surface filter medium form the end faces (17) of the cellulose-containing plug (3). [10] Tobacco filter according to any one of the preceding claims, characterized by , that the cellulose-containing plug (3) has a sleeve (20), preferably a paper sleeve, which is frictionally engaged with the filter sleeve (5). [11] Tobacco filter according to any one of the preceding claims, characterized by , that the filter sleeve (5) is made of paper. [12] Tobacco filter according to any one of the preceding claims, characterized by, that the filling material (21) of the cellulose-containing plug (3) has smoke conduction channels (22) which are formed essentially parallel to the longitudinal axis (A). [13] Tobacco filter according to any one of the preceding claims, characterized by , that the filling material (21) is made of a cellulose material, preferably of a biodegradable cellulose material, particularly preferably of biocellulose. [14] Tobacco filter according to any one of the preceding claims, characterized by , that the filling material (21) has a density of less than 0.5 g / cm³ 3 , preferably between 0.18 and 0.33 g / cm³ 3 , particularly preferably between 0.22 and 0.29 g / cm³ 3 , exhibits. [15] Tobacco filter according to any one of the preceding claims 1, 2, 4-14, characterized by , that the ceramic plug (4) has at least three smoke guide channels 6, 6a-6c) of different lengths. [16] Tobacco filter according to any one of the preceding claims, characterized by , that the granular filter medium (2) is designed as active granules, preferably based on non-fossil plant components. [17] Tobacco filter according to any one of the preceding claims, characterized by that the activated carbon granules include at least one first grain size range between 3-8 mesh in the mean grain size diameter. [18] Tobacco filter according to claim 15, characterized by that the activated carbon granules comprise a second grain size range between 8-16 mesh in the mean grain size diameter. [19] Tobacco filter according to claim 15 or 16, characterized by that the first and / or second particle size distribution is contained in the activated carbon granules to at least 20 wt.%, preferably at least 35 wt.%. [20] Tobacco filter according to any one of the preceding claims, characterized by, that the length of the cellulose-containing plug (3) is at least 10% greater, preferably 30-50% greater than the maximum outer diameter of the cellulose-containing plug (3). [21] Tobacco filter according to any one of the preceding claims 1, 2, 4-20, characterized by , that the ceramic plug (4) has several smoke guide channels (6, 6a-6c). [22] Tobacco filter according to any one of the preceding claims 1, 2, 4-21, characterized by , that the end face of the ceramic plug (4) has a recessed groove (13), wherein the terminal openings (14-16) of at least a first group of the smoke guide channels (6, 6a-6c) extend into the recessed groove (13). [23] Tobacco filter according to any one of the preceding claims 1, 2, 4-22, characterized by, that the terminal openings 14-16) of at least different groups of smoke guide channels (6, 6a.6c) have different diameters and / or extend in some areas on different cross-sectional planes (S1, S2) of the ceramic plug (4) perpendicular to the longitudinal axis (A). [24] Tobacco filter according to any one of the preceding claims 1, 2, 4-23, characterized by , that the ceramic plug (4) has at least three different groups of smoke guide channels (6, 6a-6c) which differ from each other in terms of their mean length and / or in terms of the opening cross-section of the terminal opening (14-16). [25] Tobacco filter according to any one of the preceding claims 1, 2, 4-24, characterized by , that the tobacco filter (1) has a marking to indicate a mouth side and a contact side with the tobacco (24), in particular a label to describe both sides. [26] Tobacco filter according to any one of the preceding claims, characterized by , that the cellulose-containing plug (3) contains at least 50 vol.%, preferably at least 70 vol.%, particularly preferably at least 90 vol.%, cellulose. [27] Smoking material (23) with smoking material (24) or pre-rolled coil for receiving smoking material (24), each comprising a smoking material filter (1) according to one of the preceding claims 1, 2, 4-25, characterized by , that the ceramic plug (4) of the tobacco filter (1) is in contact with the tobacco (24) or is arranged on the bottom side in a receiving chamber of the coil for receiving the tobacco (24).

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