CN214340066U - Tow unit containing spherical activated carbon, filter and tobacco product - Google Patents

Abstract

The utility model provides a silk bundle unit, filter and tobacco products that contain spherical active carbon. The tow unit includes a tow and spherical activated carbon, at least a portion of the spherical activated carbon being located within the tow. Spherical active carbon can laminate well with the silk bundle in this silk bundle unit, and when the flue gas that its contact tobacco burning produced, can carry out effective absorption to the harmful substance in the flue gas. Especially when the distribution concentration of the spherical activated carbon at the cross sections of the adjacent end surfaces is different, more contact between the spherical activated carbon and the flue gas can be realized so as to adsorb harmful substances in the flue gas.

Description

Tow unit containing spherical activated carbon, filter and tobacco product

Technical Field

The utility model belongs to the tobacco products field, concretely relates to silk bundle unit, filter and tobacco products that contain spherical active carbon.

Background

Traditional tobacco products, which have a long history and which, by the 20 th century ago, were comprised primarily of cigarettes and cigars, were typically made by rolling tobacco, lighting one end of the tobacco when smoked, and then smoking hoots at the other end to produce smoke. Modern research has found that tobacco and smoke contain thousands of compounds, including flavor components, addictive components, harmful components, and the like, including nicotine, tar, and carbon monoxide. The components of cigarette smoke may be present in the form of an oil phase, a gas phase or a semi-volatile phase. Research results show that harmful components in smoke of tobacco products have relevance to cancers, respiratory diseases, cardiovascular and cerebrovascular diseases and the like. With the increasing concern of people about the relation between smoking and health and the implementation of the tobacco control framework convention, the tar and harm reduction of tobacco products is not only a necessary trend of the development of the tobacco industry, but also an expectation of consumers and the public on the tobacco products.

Over the years, a great deal of research work for reducing tar and harm is carried out by tobacco science and technology workers from the aspects of tobacco cultivation, blending expanded cut tobacco, tobacco sheets, filter tips, material adding technology and the like in the cigarette production process, and certain progress is made. Among them, although the amount of tar in tobacco leaves can be reduced by improving the cultivation technique, it is not enough to meet the demand of commercial production at present. The addition of the expanded tobacco shreds can increase the combustibility of the cigarette and reduce the content of CO, tar and the like in the smoke, but can reduce the smoke concentration, reduce the aroma and weaken the strength, and greatly influence the feeling of the cigarette when the cigarette is smoked with hoots. Conventional cigarette filters (or "filters") may be made of cellulose or cellulose acetate, which may adsorb and filter some of the harmful components of the smoke. However, the technologies still have great room for improving the filtration of harmful components in the smoke, such as NOx, benzene series, carbonyl compounds, tar polycyclic aromatic hydrocarbons and/or nitrosamine compounds.

In recent years, activated carbon, which is a porous adsorbent material, has a large adsorption capacity and excellent processability, can be prepared from natural raw materials, and is gradually becoming an additive for adsorbing harmful substances in smoke in tobacco products. However, in the prior art, the active carbon is modified to selectively filter out certain harmful components. This undoubtedly causes the problems of complicated processing steps and high production cost of tobacco products.

Therefore, how to promote the tobacco products using activated carbon as additive from the aspect of improving structure, so as to control and/or improve the content of harmful components in the smoke, even realize the selective adsorption or filtration of some undesirable components, so as to reduce the intake of harmful substances of the tobacco products by human bodies, improve the influence of the smoke on the air environment, and the like, is a technical problem to be improved urgently.

SUMMERY OF THE UTILITY MODEL

The utility model provides a silk bundle unit containing spherical active carbon, including silk bundle and spherical active carbon, at least a part of spherical active carbon is located the silk bundle.

According to an embodiment of the invention, the tow is selected from known fibrous materials used in cigarette filters, such as fibers, cellulose, polypropylene or paper; exemplary are cellulose acetate or cellulose acetate.

According to a preferred embodiment of the invention, the tow is cylindrical or rod-shaped.

According to an embodiment of the invention, the tow comprises a cavity that can accommodate spherical activated carbon. Preferably, the spherical activated carbon is located within the cavity. The cavity may be formed before or after adding the spherical activated carbon to the tow.

According to an embodiment of the present invention, the spherical activated carbon may be located entirely within the tow, or a portion of the spherical activated carbon is located within the tow and the remaining portion is located on the tow surface.

According to an embodiment of the invention, when describing that the spherical activated carbon is located within the tow, it is meant that the outer surface of the spherical activated carbon does not protrude beyond the outer surface of the tow, preferably does not protrude beyond the axial outer surface and/or the radial outer surface of the tow.

According to an embodiment of the invention, when describing the spherical activated carbon as being located on the surface of the tow, it is meant that the outer surface of the spherical activated carbon protrudes beyond the outer surface of the tow, preferably beyond the axially outer surface and/or beyond the radially outer surface of the tow.

According to an embodiment of the present invention, the amount of spherical activated carbon located within the tow is not lower, preferably higher, than the amount of spherical activated carbon located on the surface of the tow.

According to an embodiment of the invention, the number of spherical activated carbons in the tow is more than 1, preferably more than 10, such as more than 20, more than 30, more than 40, more than 50, more than 60, more than 70, more than 80, more than 90 or more than 100.

According to an embodiment of the invention, the mass of the spherical activated carbon within the tow is 1-200mg, e.g. 5-100mg, such as 20-50mg, e.g. 10mg, 20mg, 30mg, 40mg, 50mg, 60mg, 70mg, 80mg, 90mg or 100 mg.

According to the utility model discloses an embodiment, the quantity of the cavity of receiving spherical active carbon in the silk bundle is not less than the quantity of spherical active carbon.

According to an embodiment of the invention, at least a part or all of the spherical activated carbon is dispersed continuously or discontinuously inside and/or on the surface of the tow.

According to an embodiment of the present invention, the continuous dispersion means that the distribution of the spherical activated carbon continuously extends from one end face of the tow unit to the other opposite end face of the tow unit in the axial direction of the tow unit. By continuous is meant that when the tow unit is viewed as being comprised of a plurality of radial cross sections arranged in series, each radial cross section contains at least a portion of at least one spherical activated carbon.

According to the embodiment of the present invention, in the radial cross section continuously distributed in the axial direction of the filament bundle, the distribution positions of the spherical activated carbon in at least two adjacent cross sections are the same or different. Preferably, the distribution positions of the spherical activated carbon in at least two adjacent cross sections are different.

According to the embodiment of the present invention, in the radial cross section continuously distributed along the axial direction of the filament bundle, there is at least one cross section in which the spherical activated carbon is unevenly distributed on the plane of the cross section. The non-uniform distribution means that in two plane portions separated by at least one midline of the cross-sectional plane, the respective distributed spherical activated carbon does not constitute mirror symmetry.

According to an embodiment of the present invention, the discontinuous dispersion is a spaced uniform dispersion or a spaced non-uniform dispersion.

According to the utility model discloses an embodiment, interval homodisperse means that the silk bundle unit contains a set of silk bundle section that contains spherical active carbon and does not contain the silk bundle section of shape active carbon at least, and in the silk bundle section or the whole silk bundle unit that each section contains spherical active carbon, spherical active carbon is the regularity and disperses. The regular dispersion means that the spherical activated carbon particles have a specific distance and/or a specific arrangement mode of the spherical activated carbon particles.

For example, in the tow segment in which each segment contains spherical activated carbon, the distribution positions of the spherical activated carbon in the adjacent radial cross sections are the same, or in the tow segment or the whole tow unit in which each segment contains spherical activated carbon, the particle-to-particle distances of the adjacent spherical activated carbon are equal. Preferably, in each tow segment containing spherical activated carbon, the distribution density of the spherical activated carbon (herein, the distribution density means the number of spherical activated carbons in a tow segment containing spherical activated carbon per unit volume) may be the same or different, as long as the uniform dispersion of the spherical activated carbon in each tow segment is satisfied. Preferably, the distribution positions of the spherical activated carbon in the radial cross section of the tow segments of different spherical activated carbon are the same or different. Preferably, in each tow segment comprising spherical activated carbon, the spherical activated carbon may be continuously dispersed; the continuous dispersion has the meaning as described above.

As an example, the tow unit includes at least one tow segment comprising spherical activated carbon and at least one tow segment not comprising spherical activated carbon. It should be understood that the tow unit may also include one tow segment containing spherical activated carbon and one tow segment containing no spherical activated carbon attached to each other.

When the tow unit includes more than one tow segment containing spherical activated carbon or more than one tow segment not containing spherical activated carbon, the tow segments containing spherical activated carbon and the tow segments not containing spherical activated carbon may be alternately arranged; in the tow segment containing spherical activated carbon, the distribution of the spherical activated carbon continuously extends from one end face of the tow segment to the other opposite end face of the tow segment along the axial direction of the tow unit, and the distribution position of the spherical activated carbon is the same in each radial cross section. Preferably, the length of each tow segment comprising spherical activated carbon is the same or different.

According to the embodiment of the present invention, the interval non-uniform dispersion means that the tow unit contains at least one set of tow segments containing spherical activated carbon and tow segments not containing spherical activated carbon, and the spherical activated carbon is irregularly dispersed in each tow segment containing spherical activated carbon or the whole tow unit.

Preferably, the distribution density of the spherical activated carbon is the same or different in radial cross-sections of different tow segments comprising spherical activated carbon; the distribution density has the definition as above.

When the tow unit includes more than one tow segment containing spherical activated carbon or more than one tow segment not containing spherical activated carbon, the tow segments containing spherical activated carbon and the tow segments not containing spherical activated carbon may be alternately arranged; the distribution positions of the spherical activated carbon are different in the cross section of each tow segment containing the spherical activated carbon.

Preferably, the length of each tow segment not containing spherical activated carbon is the same or different.

Preferably, the length of each tow segment comprising spherical activated carbon is the same or different.

Preferably, the length of the tow segments containing spherical activated carbon and the length of the tow segments not containing spherical activated carbon are the same or different.

According to an embodiment of the present invention, the "spherical activated carbon" (also called "carbon sphere" or "fullerene") refers to a spheroidal activated carbon or a spheroid activated carbon, wherein the orthographic projection of the spheroid activated carbon on at least 1 plane is circular, elliptical or substantially circular or elliptical, preferably the orthographic projection of the spheroid activated carbon on at least 2, preferably 3, such as at least 5 or 10 planes is circular, elliptical or substantially circular or elliptical.

According to an embodiment of the present invention, the volume V ═ γ pi (d/2) of the spherical activated carbon³Wherein γ is selected from a number of 1.0 to 2.0, such as a number of 1.2 to 1.5, for example a number of 1.3 to 1.4, preferably 4/3; d is the maximum diameter of the spherical activated carbon.

According to an embodiment of the present invention, the spherical activated carbon may have an average particle size of 0.1-2.0mm, e.g. 0.1-1.5mm, such as 0.2-1.0mm, such as 0.2-0.8mm, such as 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5 mm.

According to an embodiment of the invention, the spherical activated carbon has a porous structure.

The utility model also provides a filter, include above-mentioned silk bundle unit that contains spherical active carbon.

According to an embodiment of the invention, the filter comprises a wrapping layer for covering and/or containing the tow units comprising spherical activated carbon. For example, the material of the packaging layer can be paper or plastic.

According to an embodiment of the invention, the filter is a filter (or filter).

According to an embodiment of the present invention, the structure of the filter may be selected from single filters, binary filters, triple filters, single or multiple chamber filters, recessed filters, free-flow filters, combinations of the above-mentioned multiple filters or the like. For example, the end of the filter may be provided with a plurality of filter holes, the diameter of the filter holes being between 400 and 550 μm, preferably 420 and 530 μm.

According to embodiments of the present invention, the filter may also contain units of other adsorbents, catalysts and/or additives.

The utility model discloses still provide a tobacco products, include above-mentioned silk bundle unit and/or above-mentioned filter that contains spherical active carbon.

According to an embodiment of the invention, the tobacco product comprises a tobacco containing unit and the tow unit comprising spherical activated carbon, the tow unit comprising spherical activated carbon being connected with the tobacco containing unit.

According to an embodiment of the invention, the tobacco product comprises a tobacco containing unit and the filter, a tow unit comprising spherical activated carbon in the filter being connected with the tobacco containing unit. Preferably, the tow segments comprising spherical activated carbon in the tow units are connected to tobacco containing units.

The beneficial effects of the utility model

The utility model provides a contain spherical active carbon among the spherical active carbon silk bundle unit can laminate well with the silk bundle, when the flue gas that its contact tobacco burning produced, can carry out effective absorption to the harmful substance in the flue gas. Especially when the distribution concentration of the spherical activated carbon at the cross sections of the adjacent end surfaces is different, more contact between the spherical activated carbon and the flue gas can be realized so as to adsorb harmful substances in the flue gas.

Drawings

FIG. 1 is a schematic structural view of a tow unit comprising spherical activated carbon provided in example 1; wherein, (a) is the cross section of the first end face, and (b) is the cross section of the second end face.

Fig. 2 is a schematic cross-sectional structure diagram of a tow unit containing spherical activated carbon provided in example 2.

Fig. 3 is a schematic cross-sectional structure diagram of a tow unit containing spherical activated carbon provided in example 3.

Reference numerals: 1-tow, 2-spherical activated carbon, a1, a1 '-tow segments comprising spherical activated carbon, a2, a 2' -tow segments comprising spherical activated carbon, B, B1, B2-tow segments not comprising spherical activated carbon.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the following embodiments. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All the technologies realized based on the above mentioned contents of the present invention are covered in the protection scope of the present invention.

Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.

Example 1

The tow unit containing spherical activated carbon shown in fig. 1 comprises tow 1 and spherical activated carbon 2, wherein the spherical activated carbon 2 is continuously dispersed in the tow 1, the tow 1 is made of cellulose acetate, and the spherical activated carbon 2 has an average particle size of 0.2-0.6mm and has a porous structure.

The distribution of the activated carbon 2 continuously dispersed into spherical shapes continuously extends from one end face of the tow unit to the other opposite end face of the tow unit in the axial direction of the tow unit. Any adjacent radial end face, with adjacent radial end faces: the first end face (shown as a in fig. 1) and the second end face (shown as b in fig. 1) are used as examples, and the distribution positions of the spherical activated carbon 2 are different in the radial cross sections of the two end faces. And the spherical activated carbon is distributed unevenly on the planes of the first end face and the second end face.

Example 2

The tow unit containing the spherical activated carbon as shown in fig. 2 comprises a tow 1 and the spherical activated carbon 2, wherein the spherical activated carbon 2 is discontinuously dispersed in the tow 1, the tow 1 is made of cellulose acetate, and the spherical activated carbon 2 has an average particle size of 0.3-0.7mm and a porous structure.

The discontinuous dispersion is uniform dispersion at intervals, the tow unit comprises two tow segments A1 and A2 containing spherical activated carbon and a tow segment B which is connected with the tow segment A1 and the tow segment A2 respectively and does not contain spherical activated carbon, in the tow segments A1 and A2 containing the spherical activated carbon, the distribution of the spherical activated carbon continuously extends from one end face of the tow segment to the other opposite end face of the tow segment along the axial direction of the tow unit, and in each adjacent radial cross section, the distribution position of the spherical activated carbon is the same.

Example 3

The tow unit containing the spherical activated carbon shown in fig. 3 comprises a tow 1 and the spherical activated carbon 2, wherein the spherical activated carbon 2 is discontinuously dispersed in the tow 1, the tow 1 is made of cellulose acetate, and the spherical activated carbon 2 has an average particle size of 0.3-0.7mm and a porous structure.

The discontinuous dispersion is a spaced non-uniform dispersion, and the tow unit comprises two tow segments A1 'and A2' containing spherical activated carbon and tow segments B1 and B2 containing no spherical activated carbon, the tow segments being arranged in the order of A1 ', B1, A2' and B2. In the tow segments a1 and a2 containing spherical activated carbon, the distribution position of the spherical activated carbon is different in a certain adjacent radial cross section in each tow segment containing spherical activated carbon.

Example 4

A filter comprising a paper wrapper and a tow unit of any of the configurations provided in examples 1, 2 or 3, wherein the cylindrical surface of the tow unit is covered by the paper wrapper.

Example 5

A smoking article comprising a tobacco-containing unit and the filter provided in example 4, wherein a tow segment comprising spherical activated carbon in a tow unit in the filter is attached to the tobacco-containing unit.

The exemplary embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the above embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (50)

1. A tow unit comprising spherical activated carbon, wherein the tow unit comprises a tow and spherical activated carbon, the spherical activated carbon being located wholly within the tow, or a portion of the spherical activated carbon being located within the tow and the remainder being located at the tow surface;

at least a portion of the spherical activated carbon is dispersed continuously or non-continuously within and/or on the surface of the tow;

the number of spherical activated carbon located in the tow is not less than the number of spherical activated carbon located on the surface of the tow.

2. The tow unit according to claim 1, wherein the tow is selected from known fibrous materials used in cigarette filters.

3. The tow unit according to claim 2, wherein the tow is a fiber, cellulose, polypropylene, or paper.

4. The tow unit according to claim 3, wherein the tow is cellulose acetate or cellulose acetate fibers.

5. The tow unit according to any one of claims 1 to 4, wherein the tow is cylindrical or rod-shaped.

6. The tow unit according to any one of claims 1 to 4, wherein the tow contains a cavity capable of receiving spherical activated carbon.

7. The tow unit of claim 6, wherein the spherical activated carbon is located within the cavity.

8. The tow unit of claim 1, wherein the number of spherical activated carbons in the tow is greater than 1.

9. The tow unit of claim 8, wherein the number of spherical activated carbons in the tow is greater than 10.

10. The tow unit according to claim 1, wherein the mass of the spherical activated carbon within the tow is 1-200 mg.

11. The tow unit according to claim 10, wherein the mass of the spherical activated carbon within the tow is 5-100 mg.

12. The tow unit according to claim 10 or 11, wherein the mass of the spherical activated carbon within the tow is 20-50 mg.

13. The tow unit according to claim 6, wherein the number of cavities in the tow containing spherical activated carbon is not less than the number of spherical activated carbons.

14. The tow unit according to claim 1, wherein the continuous dispersion means that the distribution of the spherical activated carbon continuously extends from one end face of the tow unit to the other opposite end face of the tow unit in the axial direction of the tow unit; or when the tow unit is viewed as being comprised of a plurality of radial cross sections arranged in series, each radial cross section containing at least a portion of at least one spherical activated carbon.

15. The tow unit according to claim 14, wherein in radial cross sections continuously distributed in the axial direction of the tow, the distribution positions of the spherical activated carbon in at least two adjacent cross sections are the same or different.

16. The tow unit according to claim 15, wherein the distribution positions of the spherical activated carbon in at least two adjacent cross sections are different.

17. The tow unit according to claim 14, wherein at least one cross section exists in the radial cross sections continuously distributed along the axial direction of the tow, and the spherical activated carbon is unevenly distributed in the plane of the cross section.

18. The tow unit of claim 1, wherein the discontinuous dispersion is a uniformly spaced dispersion or a non-uniformly spaced dispersion.

19. The tow unit according to claim 18, wherein the uniformly spaced tow units comprise at least one group of tow segments containing spherical activated carbon and tow segments not containing spherical activated carbon, and the spherical activated carbon is regularly spaced in each tow segment containing spherical activated carbon or the whole tow unit.

20. The tow unit according to claim 19, wherein the distribution positions of the spherical activated carbon in adjacent radial cross sections are the same in each tow section containing spherical activated carbon, or the particle-to-particle distances of adjacent spherical activated carbon are equal in each tow section containing spherical activated carbon or the whole tow unit.

21. The tow unit according to claim 19, wherein the distribution density of the spherical activated carbon is the same or different in each tow segment containing the spherical activated carbon, so that the spherical activated carbon is uniformly dispersed in each tow segment.

22. The tow unit according to claim 21, wherein the distribution positions of the spherical activated carbon in the radial cross-section of the tow segments of different spherical activated carbon are the same or different.

23. A tow unit according to any one of claims 19 to 22, wherein the spherical activated carbon is continuously dispersed in each tow segment comprising spherical activated carbon.

24. The tow unit according to claim 1 or 19, wherein the tow unit comprises at least one tow segment containing spherical activated carbon and at least one tow segment not containing spherical activated carbon.

25. The tow unit according to claim 24, wherein the tow unit comprises one tow segment containing spherical activated carbon and one tow segment containing no spherical activated carbon attached to each other.

26. The tow unit according to claim 24, wherein when the tow unit includes more than one tow segment containing spherical activated carbon or more than one tow segment not containing spherical activated carbon, the tow segments containing spherical activated carbon and the tow segments not containing spherical activated carbon are alternately arranged; in the tow segment containing spherical activated carbon, the distribution of the spherical activated carbon continuously extends from one end face of the tow segment to the other opposite end face of the tow segment along the axial direction of the tow unit, and the distribution position of the spherical activated carbon is the same in each radial cross section.

27. The tow unit according to claim 18, wherein the spaced non-uniform dispersion means that the tow unit contains at least one set of tow segments containing spherical activated carbon and tow segments not containing spherical activated carbon, and the spherical activated carbon is irregularly dispersed in each tow segment containing spherical activated carbon or in the whole tow unit.

28. The tow unit according to claim 27, wherein the distribution density of spherical activated carbon is the same or different in radial cross-sections of different tow segments containing spherical activated carbon.

29. The tow unit according to claim 27, wherein when the tow unit includes more than one tow segment containing spherical activated carbon or more than one tow segment not containing spherical activated carbon, the tow segments containing spherical activated carbon and the tow segments not containing spherical activated carbon are alternately arranged; the distribution positions of the spherical activated carbon are different in the cross section of each tow segment containing the spherical activated carbon.

30. A tow unit according to claim 19 or 27, wherein the lengths of the respective tow segments not containing spherical activated carbon are the same or different.

31. The tow unit according to claim 19 or 27, wherein the lengths of the individual tow segments comprising spherical activated carbon are the same or different.

32. The tow unit according to claim 19 or 27, wherein the tow segments comprising spherical activated carbon and the tow segments not comprising spherical activated carbon are the same or different in length.

33. The tow unit according to claim 1, wherein the "spherical activated carbon" refers to a spherical activated carbon or a spheroid activated carbon, wherein an orthographic projection of the spheroid activated carbon on at least 1 plane is circular, elliptical or substantially circular or elliptical.

34. The tow unit according to claim 1, wherein the spherical activated carbon has an average particle diameter of 0.1-2.0 mm.

35. A tow unit according to claim 1 or 34, wherein the spherical activated carbon has an average particle size of 0.1 to 1.5 mm.

36. The tow unit according to claim 35, wherein the spherical activated carbon has an average particle size of 0.2-1.0 mm.

37. The tow unit according to claim 36, wherein the spherical activated carbon has an average particle size of 0.2-0.8 mm.

38. A tow unit according to claim 1 or 34, wherein the spherical activated carbon has a porous structure.

39. A filter comprising the tow unit comprising spherical activated carbon of any one of claims 1-38.

40. The filter of claim 39, comprising a wrapper for wrapping and/or containing the tow units comprising spherical activated carbon.

41. The filter of claim 40, wherein the wrapper is paper or plastic.

42. A filter as claimed in any of claims 39 to 41, wherein the filter is a filter or filter plug.

43. A filter as claimed in claim 42, wherein the filter is of a construction selected from single filters, binary filters, triple filters, single or multiple chamber filters, recess filters, free-flow filters, combinations thereof or the like.

44. The filter of claim 42 or 43, wherein the end of the filter is provided with a plurality of filter holes, and the diameter of the filter holes is between 400 and 550 μm.

45. The filter of claim 44 wherein the filter pores have a diameter of 420-530 μm.

46. A filter as claimed in any one of claims 39 to 41, wherein the filter also contains units of other adsorbents, catalysts and/or additives.

47. A smoking article comprising a tow unit comprising spherical activated carbon according to any one of claims 1 to 38 and/or a filter according to any one of claims 39 to 46.

48. A smoking article according to claim 47, comprising a tobacco-containing unit and a tow unit comprising spherical activated carbon according to any of claims 1 to 38, the tow unit comprising spherical activated carbon being connected to the tobacco-containing unit.

49. A smoking article according to claim 47, comprising a tobacco-containing unit and a filter according to any of claims 39 to 46, wherein the tow unit comprising spherical activated carbon is attached to the tobacco-containing unit.

50. A smoking article according to claim 49, wherein the tow segments comprising spherical activated carbon in the tow units are connected to tobacco containing units.

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