Tobacco product filter and tobacco product comprising tobacco material, or prerolled blunt for receiving tobacco material, comprising the tobacco product filter

Abstract

The invention relates to: a tobacco product filter (1) comprising a filter sleeve (5) and a granular filter medium (2) arranged therein, characterised in that a first closure element (4) at a first end of the filter sleeve (5) is in the form of a cellulose-containing plug; and / or to a tobacco product (23) comprising tobacco material (24); or to a prerolled blunt for receiving tobacco material (24), each of the tobacco product and the prerolled blunt comprising the tobacco product filter (1).

Description

[0001] SMOKING FILTER AND SMOKING PRODUCTS WITH SMOKING PRODUCTS OR PRE-ROLLED WRAP FOR RECEIVING SMOKING PRODUCTS COMPREHENSIVELY THE SMOKING FILTER

[0002] 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.

[0003] 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.

[0004] Pre-rolled coils are also referred to as blunts or pre-rolled blunts in the field of application.

[0005] 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.

[0006] 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 microplastics worldwide 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.

[0007] Activated carbon filters with ceramic end caps, however, have the disadvantage that fine dust particles can detach from the carbon fragments in the carbon filling if the filters 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. DE 10 2020 131 196 A1 and DE 10 2023 103 671 A1 disclose a tobacco filter with two end ceramic plugs. To prevent smaller activated carbon particles from passing through the ceramic filter, cellulose can be arranged in the sleeve of the tobacco filter in addition to the plugs. The cellulose, as a bale or sheet filter medium, is therefore not part of a plug. In this variant, the side with the cellulose must be marked, since both plugs have the same appearance at the ends. Moreover, the cellulose increases the length of the tobacco filter.Furthermore, the degree of packing of the cellulose is undefined, so that different tobacco filters have different qualities with regard to flow resistance.

[0008] German patent DE 20 2017 004 762 U1 discloses a tobacco filter with an activated carbon filling. A ceramic plate forms the terminal closure element. A separate cellulose-containing pre-filter can be connected to this ceramic plate. This variant has, among other disadvantages, the fact that a plate-shaped ceramic closure exerts only low clamping forces. This closure is located adjacent to a pre-filter made of a comparatively soft material. Therefore, careful coordination of the forces and packing density of the pre-filter with the upstream ceramic material is essential.

[0009] DE 20 2012 103 319 U1 discloses a smoke filter with a granular clay material. This clay material tends to increase in particle size, especially in humid air, resulting in a different starting situation than when using activated carbon.

[0010] The object of the present invention is therefore to provide a tobacco product filter which reduces or completely eliminates the aforementioned disadvantages.

[0011] The present invention solves this problem by providing a tobacco product filter with the features of claim 1.

[0012] A tobacco filter according to the invention comprises a filter sleeve, a granular filter medium arranged therein, in particular activated carbon granules, and a first closure element 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 has at least 50 wt.% cellulose. The granular filter medium preferably filters more tobacco components than the material of the closure element over the same longitudinal section.

[0013] 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.

[0014] Since cellulose, unlike cellulose acetate, is significantly more biodegradable in nature, the smoking filter made from it is much more environmentally friendly.

[0015] The invention can be implemented in two preferred variants.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In the field of filters for smoking materials, the prevailing philosophy, for reasons of ease of handling, has been to use identical end caps for 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 both plug types and fixing them in a filter sleeve is challenging. However, extensive tests have surprisingly shown that combining both plug types in an activated carbon filter is possible. Furthermore, unlike with pure fiber material, the smoking material can be smoked until the end or until the tobacco is completely consumed, whereas otherwise the embers can transfer to the fiber material.

[0020] 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.

[0021] The above description indicates that the two aforementioned closure elements or plugs are arranged at the ends of the tobacco filter. One of the base surfaces of the two cylindrical plugs thus simultaneously forms the end face of the tobacco filter facing its surroundings.

[0022] Advantageous embodiments of the invention are the subject of the dependent claims.

[0023] Particularly preferably, the tobacco filter can be formed along its longitudinal axis solely from the two closure elements and the granular filter medium arranged between them, preferably in the form of activated carbon. This makes the tobacco filter easy to manufacture, and multiple tobacco filters exhibit high reproducibility with regard to their properties. Accordingly, each of the plugs has an inner end face that contacts the granular filter medium, preferably the activated carbon. No further intermediate filters are provided.

[0024] For good filtration efficiency with a compact design, it is advantageous if the cellulose of the stopper extends over the entire length of the stopper.

[0025] 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.

[0026] It is also preferred that the length of the ceramic plug along the longitudinal axis A of the filter be less than its maximum outer diameter. This offers the advantage of optimized flow characteristics and a more compact filter design. With a cellulose-containing plug, only a lesser contact force can be generated. In this case, a tighter seal is required. For improved frictional engagement and thus a better fit in the filter sleeve, it is advantageous if the length of the cellulose-containing plug along the longitudinal axis A of the filter is greater than its maximum outer diameter.

[0027] The optimal dimensions with regard to length to outer diameter are therefore contrary for the ceramic plug compared to the cellulose-containing plug.

[0028] The cellulose-containing plug can advantageously comprise a filler containing at least 70 wt.%, and particularly preferably at least 90 wt.%, 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.

[0029] 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.

[0030] The filling material can be made particularly advantageously from a cellulose material, preferably from a biodegradable cellulose material, especially preferably from biocellulose.

[0031] 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. Further optimized against blockage, the ceramic plug can have at least three smoke guide channels of different lengths.

[0032] 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.

[0033] In addition to using the cellulose plug to provide extra retention, the activated carbon granules can include an initial grain size range of 8-16 mesh in the medium grain diameter.

[0034] Moreover, the use of the cellulose-containing plug allows the use of a finer second grain size line between 3-8 mesh in the mean grain size diameter and thus an increased filter surface area, as the risk of fine dust being carried out is no longer present.

[0035] 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.%.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The ceramic stopper can have at least three different groups of smoke channels, which differ from one another in terms of their average length and / or in terms of the cross-sectional area of ​​the terminal opening. For easier handling, the tobacco filter can have a marking to indicate a mouth side and a contact side with the tobacco, in particular a label to describe both sides.

[0040] 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.

[0041] 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.

[0042] 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:

[0043] Fig. 1 Schematic representation of a tobacco filter according to the invention; and

[0044] Fig. 2 schematic representation of a smoking product according to the invention.

[0045] Fig. 1 shows a tobacco filter 1 comprising a filter medium 2 and two terminal plug-like closure elements 3 and 4.

[0046] The tobacco filter 1 also includes a filter sleeve 5. This sleeve can be cylindrical or conical. The filter sleeve can be made of filter paper, which can be bleached, unbleached, colored, and / or multicolored. The diameter and / or length of the filter sleeve 5 can vary. A granular filter medium can be arranged inside the filter sleeve 5. The 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.

[0047] The preferred particle size distribution can vary. At least two particle sizes can be used: a second with a mean diameter of 3-8 mesh and a first 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The entire tobacco filter 1 can preferably be designed to be flame-resistant and tasteless, i.e., have no inherent taste.

[0054] 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.

[0055] Carbon, for example activated carbon, particularly from a natural resource such as coconut, can be used as the filter medium 2. The activated carbon can be present in granular form within the sleeve 5. A detailed description of the ceramic plugs 4 is explained below with reference to Fig. 2. The ceramic plug 4 used in the smoking material filter 1 is heat-resistant. Each ceramic plug 4 preferably consists of a ceramic body. An open-pored ceramic, such as a fired piece of ground soapstone, can preferably be used as the ceramic. Furthermore, the ceramic plug has smoke guide channels 6. The smoke guide channels 6 of the ceramic plug 4 extend from an outer surface 7 of the smoking material filter 1, which contacts the smoking material, 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.

[0056] 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.

[0057] 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.

[0058] The retention of the cellulose-containing plug 3 in the filter sleeve 5 can therefore be achieved by an oversize fit and / or by friction fit.

[0059] 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.

[0060] 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.

[0061] For effective frictional closure 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, extending along its longitudinal axis, be greater than its maximum outer diameter. Particularly preferred is a length of at least 10%, and preferably 30-50%, greater than the maximum outer diameter of the cellulose-containing plug 3. Furthermore, a special 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 plug, the airflow characteristics of the filling material of the cellulose-containing plug 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.

[0062] In particular, the adhesive-free fixation of the cellulose filter by a longitudinal extension greater than the maximum outer diameter is advantageous for increasing the friction surface, since an excessively tight press fit of the cellulose-containing plug, unlike with a ceramic plug, causes compression of the filling material 21 and thus a change in the density of the filling material. 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-containing plug 3. The aforementioned dimensions and densities represent a good compromise of all boundary conditions and were determined in extensive tests.

[0063] 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.

[0064] 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 embodiment shown in Figures 2 and 3, 6 smoke guide channels 6 are arranged along the circular path 10. These smoke guide channels 6 are preferably arranged equidistant from one another 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.

[0065] 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 groove 13 in the outer surface 7 of the ceramic plug.

[0066] Each recessed groove 13 has a base surface 19.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] As a consequence of the preceding description, the lengths of the smoke ducts 6a-6c are different.

[0072] Tests with various participants revealed a significant improvement in the smoking experience with the tobacco filter, particularly when using cannabis products. This is evident, among other things, in a changed perception of the smoke in the throat during inhalation. Visually, a distinct discoloration of the cellulose or cellulose filler material at the outlet is noticeable due to the filtered contaminants.

[0073] Fig. 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 variant of the invention, not shown but easily understood from the context of Figs. 1 and 2, a tobacco filter is formed with a cellulose-containing plug on the second side 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 made 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.

[0077] Reference sign

[0078] 1 tobacco filter

[0079] 2 Filter medium

[0080] 3. Closure element / cellulose-containing stopper

[0081] 4. Closure element / ceramic plug

[0082] 5 filter sleeve

[0083] 6 Smoke duct

[0084] 6a-6c Smoke ducts

[0085] 7 Outside

[0086] 8 Inside

[0087] 9 Surface area

[0088] 10 circular track

[0089] 11 Surface area

[0090] 13 Indentation groove

[0091] 14 Opening

[0092] 15 Opening

[0093] 16 Opening

[0094] 17 Front

[0095] 18 edge

[0096] 19 floor area

[0097] 20 sleeve

[0098] 21 Filling material

[0099] 22 Smoke duct

[0100] 23 Tobacco products

[0101] 24 smoking materials

[0102] A Longitudinal axis

[0103] 51 Section plane

[0104] 52 Section plane

Claims

1. Claims 1. Tobacco filter (1) comprising a filter sleeve (5), a granular filter medium (2) arranged therein in the form of activated carbon granules, characterized in 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 in that a second closure element at a second end of the filter sleeve is designed as a ceramic plug.

3. Tobacco filter according to claim 1, characterized in 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 identical to the first closure element.

4. Tobacco filter according to one of the preceding claims, characterized in 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 in 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 one of the preceding claims, characterized in 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 one of the preceding claims, characterized in that the cellulose-containing plug (3) has 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 one of the preceding claims, characterized in that the filler (21) is designed as a bundled surface filter medium, the filter surface of which is arranged substantially parallel to the longitudinal axis (A).

9. Tobacco filter according to one of the preceding claims, characterized in 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 one of the preceding claims, characterized in that the cellulose of the plug extends over the entire length of the plug.

11. Tobacco filter according to one of the preceding claims, characterized in that the cellulose-containing plug (3) has a sleeve (20), preferably a paper sleeve, which is frictionally engaged with the filter sleeve (5).

12. Tobacco filter according to one of the preceding claims, characterized in that the filter sleeve (5) is made of paper.

13. Tobacco filter according to one of the preceding claims, characterized in that the filling material (21 ) of the cellulose-containing plug (3) has smoke guide channels (22) which are formed substantially parallel to the longitudinal axis (A).

14. Tobacco filter according to one of the preceding claims, characterized in that the filling material (21 ) is made of a cellulose, preferably of a biodegradable cellulose, particularly preferably of biocellulose.

15. Tobacco filter according to one of the preceding claims, characterized in 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.

16. Tobacco filter according to one of the preceding claims 1 , 2, 4-14, characterized in that the ceramic plug (4) has at least three smoke guide channels 6, 6a-6c) of different lengths.

17. Tobacco filter according to one of the preceding claims, characterized in that the granular filter medium (2) is based on non-fossil plant components.

18. Tobacco filter according to one of the preceding claims, characterized in that the activated carbon granules comprise a first grain size line between 8-16 mesh in the mean grain size diameter.

19. Tobacco filter according to one of the preceding claims, characterized in that the activated carbon granules comprise at least a second grain size line between 3-8 mesh in the mean grain size diameter.

20. Tobacco filter according to claim 18 or 19, characterized in 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.%.

21. Tobacco filter according to one of the preceding claims, characterized in 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).

22. Tobacco filter according to one of the preceding claims 1 , 2, 4-21 , characterized in that the ceramic plug (4) has several smoke guide channels (6, 6a-6c).

23. Tobacco filter according to one of the preceding claims 1, 2, 4-22, characterized in 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).

24. Tobacco filter according to one of the preceding claims 1, 2, 4-23, characterized in 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 certain areas on different cross-sectional planes (S1, S2) of the ceramic plug (4) perpendicular to the longitudinal axis (A).

25. Tobacco filter according to any of the preceding claims 1, 2, 4-24, characterized in that the ceramic plug (4) has at least three different groups of smoke guide channels (6, 6a-6c) which differ from each other with respect to their mean length and / or with respect to the opening cross-section of the terminal opening (14-16).

26. Tobacco filter according to one of the preceding claims 1 , 2 , 4-25, characterized in that the tobacco filter (1 ) has a marking for identifying a mouth side and a contact side with the tobacco (24), in particular a label for describing both sides.

27. Tobacco filter according to one of the preceding claims, characterized in that the cellulose-containing plug (3) comprises at least 50 vol.%, preferably at least 70 vol.%, particularly preferably at least 90 vol.%, cellulose.

28. 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 in that the ceramic plug (4) of the smoking material filter (1 ) is in contact with the smoking material (24) or is arranged on the bottom side in a receiving space of the coil for receiving the smoking material (24).

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