CN102159101A

CN102159101A - Filter for a smoking article

Info

Publication number: CN102159101A
Application number: CN2009801361339A
Authority: CN
Inventors: M.杜克; P.奥利贝拉
Original assignee: British American Tobacco Co Ltd
Current assignee: British American Tobacco Investments Ltd
Priority date: 2008-09-16
Filing date: 2009-09-10
Publication date: 2011-08-17
Also published as: KR20110063548A; UA101219C2; EP2352398B1; US20110232660A1; AU2009294388A1; WO2010032033A1; EP2352398A1; MX2011001936A; BRPI0917174A2; RU2011115123A; CA2735469A1; GB0816933D0; RU2526014C2; CL2009001858A1; ZA201101451B; JP2012502628A; AR076438A1; JP3190703U

Abstract

The invention provides a filter element for a smoking article. The filter element comprises a plug of filter material, a tobacco core extending substantially longitudinally through the plug of filter material, and wrapping means wrapped around at least a portion of a longitudinally extending surface of the tobacco core. The filter element can be used in a variety of smoking articles.

Description

The filter that is used for smoking product

Technical field

The present invention relates to be used for the filter of smoking product.

Background technology

Well-known is taste and the aromatic property that influences product may be in smoking such as the filtration of the smog in the smoking product of cigarette the time.Filter generally includes the absorber material such as activated carbon, to reduce some component of cigarette during smoking.Yet the activated carbon in the filter may influence the taste and/or the aromatic property of cigarette negatively.

Summary of the invention

Therefore, in a first aspect of the present invention, a kind of filter cell that is used for smoking product is provided, this filter cell comprise the embolism (plug) of filtering material, basically longitudinally extend through filtering material embolism the tobacco core and be wrapped in Wrap device around at least a portion on longitudinal extension surface of tobacco core.

The inventor found to be provided basically longitudinally the tobacco core improved the fragrance of the cigarette (it comprises gas and particulate matter) that is sucked by the smoker.In addition, the Wrap device that is provided guarantees that tobacco remains on the interior in-core of embolism of filtering material, and guarantees along its guiding cigarette.

Preferably, the tobacco core longitudinally extends between the mutual opposing end faces of the embolism of filtering material basically.Preferably, the tobacco core is along extending with the substantially parallel direction in the side of the embolism of filtering material, and this side preferably is substantially perpendicular to one or two end face.Preferably, the tobacco core extends through the inside of filtering material and is filtered material and centers on.Preferably, the tobacco core extends through the center of the embolism of filtering material basically.

Advantageously, the tobacco core be set to when air-flow passes filter cell and the path of air-flow closely approaching, therefore and can before this air-flow arrives smoker's mouth, influence the various characteristics of air-flow.In addition, because the tobacco core longitudinally is arranged in the embolism of filtering material basically, so it can not influence the direction or the speed of air-flow negatively, so the smoker can not realize the significant difference by the resistance aspect of tobacco wicking gas.

The tobacco core can comprise tobacco leaf silk, powdered tobacco, reconstituted tobacco, tobacco stem, cigarette fibre, tobacco sheet and/or pipe tobacco.Yet preferably, the tobacco core comprises pipe tobacco sheet, tobacco mixture and/or tobacco stem.

The tobacco core can form the tobacco rod of any cross section.For example, the tobacco core can form the tobacco rod of triangle or square cross section.Yet preferably, the tobacco core forms the tobacco rod of circular cross section.Therefore, the tobacco core can be columniform in shape basically.

But Wrap device is air permeable basically, makes that cigarette can be therefrom by to the tobacco core when smoker inhales.This Wrap device can be formed by any conventional paper material.For example, Wrap device can comprise embolism wrappage (plugwrap) or paper, for example cigarette paper.Wrap device can be bored a hole.This Wrap device can be to restore wrapping paper or tobacco sheet wrapping paper.Wrap device can comprise tobacco leaf.Wrap device can be impermeable.

Wrap device can with whole contacts side surfaces of longitudinal extensions basically of tobacco core.Preferably, Wrap device limits the scope of tobacco.Yet Wrap device can not be set at around at least one end face of tobacco core, but preferably around each end face.

The tobacco core can comprise or stem from least one vertical section such as the tobacco rod of smoking products such as cigarette, cigar or cigarlet, i.e. the aspirated section of smoking product.The vertical section that will be appreciated that tobacco rod will comprise wrapping paper, and such as cigarette paper etc., and this wrapping paper forms the Wrap device of the filter cell of first aspect.

Preferably, the diameter of vertical section of tobacco rod is less than the diameter of the embolism of filtering material, and therefore less than the diameter according to the filter cell of first aspect, makes it form the tobacco core that therefrom extends through.Standard-sized cigarette trending towards has about 7.5 mm to about 9.5 mm(8-12 mm preferably) diameter, and the cigarette of elongated dimension trends towards the diameter of about 2-6 mm.Therefore, because the diameter of the tobacco rod of elongated dimension cigarette less than the diameter of the tobacco rod of standard size cigarette, forms the tobacco core that is wrapped of filter cell with in the filter that is used in the standard size smoking product so the inventor imagines the longitudinal extension section of the tobacco rod of using the elongated dimension smoking product.The inventor believes that they consider to use the tobacco rod section of elongated dimension smoking product to form tobacco core in the filter of standard size smoking product at first.

Therefore, in a second aspect of the present invention, a kind of filter cell that is used for smoking product is provided, this filter cell comprises the embolism of filtering material and longitudinally extends through the tobacco core of the embolism of filtering material basically, wherein, the tobacco core comprises or stems from vertical section of the tobacco rod of smoking product.

The tobacco core can comprise or stem from vertical section of the tobacco rod of elongated dimension smoking product.Vertical section of the tobacco rod that is wrapped by using the elongated dimension smoking product can promote the manufacturing of standard size filter cell.In addition, advantageously, easier change extends through the tobacco in vertical core of filtering material, thereby different tobacco pattern and tastes is provided in multiple filter cell.

Will be appreciated that the tobacco core can stem from many dissimilar elongated dimension smoking products, and the yardstick of this type of elongated dimension smoking product can be different for different brands.Yet, first or the filter cell of second aspect in the diameter of tobacco core can be between 3 mm and 8 mm, preferably diameter is between 3 mm and 7 mm, more preferably diameter between 3.5 mm and 6.5 mm, and most preferably diameter between 4 mm and 6 mm.

Once preparation, can encase the tobacco core to form first or the filter cell of second aspect with filtering material.With known, the embolism of filtering material can comprise any suitable filter medium as the technical staff.Preferred filtering material comprises cellulose acetate.The diameter of the embolism of filtering material can be between 5 mm and 15 mm, preferably between 6 mm and 12 mm, more preferably between 7 mm and 10 mm, and most preferably between 7 mm and 9 mm.

Preferably, the ratio of the diameter of the diameter of the embolism of filtering material and tobacco core is between 0.5:1 and 10:1, more preferably between 1:1 and 5:1, even more preferably between 1:1 and 3:1, and most preferably between 1.5:1 and 2:1.

First or the filter cell of second aspect can comprise essence.In the embodiment that uses essence, essence can be combined in the embolism of filtering material.Yet, preferably, essence is combined in the tobacco core.For example, can before tobacco-containing material forms rod, essence be sprayed onto on the tobacco-containing material.

Will be appreciated that and in the manufacturing of filter, to use according to first or the filter cell of second aspect, in smoking product, using.

Therefore, according to a third aspect of the invention we, provide a kind of filter that is used for smoking product, this filter comprises according to first or the filter cell of second aspect.

The filter of the third aspect can comprise a plurality of according to first or the filter cell of second aspect, and wherein, the tobacco core extends through the embolism of filtering material.For example, filter can comprise 2,3,4,5 or more a plurality of first or the filter cell of second aspect, wherein, the adjacent filter element can be interconnected, perhaps can with other filter cell (its can be not according to first or second aspect) described element is separated from each other.

Therefore, described filter can comprise a plurality of filter cells, and wherein at least one is according to of the present invention first or the filter cell of second aspect.For example, it is contemplated that in one embodiment, except that comprise one or more according to first or the filter cell of second aspect (promptly comprising the tobacco core), the filter of the third aspect can also comprise the absorbent filter cell, this element comprises absorber material.It is in order to absorb and therefore reduce some component of smog during smoking that this absorbent filter cell is provided.The absorbent filter cell can comprise the embolism of the filtering material that has wherein disperseed absorber material.Filtering material can be a cellulose acetate.Preferred absorber material is an activated carbon.Activated carbon can be taked the form of granule activated carbon, and it preferably is dispersed throughout the volume of the embolism of filtering material basically.Preferably, the absorbent filter cell does not comprise the tobacco core.

In another embodiment, except that comprise one or more according to first or the filter cell of second aspect (promptly comprising the tobacco core), the filter of the third aspect can also comprise filter cell, this filter cell comprise filtering material (such as, cellulose acetate), and its do not comprise tobacco core or absorber material.

Wave filter can comprise at least two and at least three filter cells preferably, as long as at least one filter cell is according to first or second aspect.Preferably, filter comprises according to first or the filter cell of second aspect, comprises the absorbent filter cell of absorbent and do not comprise absorbent or the filter cell of tobacco core.Preferably, a plurality of filter cells are longitudinally arranged mutually, the end face of the end surfaces adjacent filter element of a filter cell.Preferably, filter cell has substantially similar diameter.Will be appreciated that as shown in Figure 3 and Figure 4 various filter cells can be according to any order in filter.

Can with first or the filter cell of second aspect or the filter of the third aspect be attached in the smoking product.

Therefore, according to a forth aspect of the invention, provide a kind of smoking product, this smoking product comprises according to first or the filter cell of second aspect or according to the filter of the third aspect.

Described smoking product preferably includes such as the section of the smokeable material of tobacco or rod.Term as used herein " smoking product " but comprise draw product, such as cigarette, cigar and cigarlet, no matter be based on tobacco, tobacco derivative, expanding tobacco, reconstituted tobacco or tobacco, and also comprise the heating but incombustible product.

Can come the section and the filter of attached smokeable material with yew paper.

According to a fifth aspect of the invention, provide a kind of manufacturing to be used for the method for the filter cell of smoking product, this method comprises that the embolism by filtering material provides the tobacco core, wherein, described tobacco core longitudinally extends through the embolism of filtering material basically, and wherein, Wrap device is wrapped in around at least a portion on longitudinal extension surface of tobacco core.

According to a sixth aspect of the invention, provide a kind of manufacturing to be used for the method for the filter cell of smoking product, this method comprises that the embolism by filtering material provides the tobacco core, wherein, described tobacco core longitudinally extends through the embolism of filtering material basically, and wherein, described tobacco core comprises or stems from vertical section of the tobacco rod of smoking product.

The method of the 6th aspect can comprise step: arrange vertical section of the tobacco rod of elongated dimension smoking product, make it longitudinally extend through the embolism of filtering material basically.Preferably, be cut to the section of suitable length before the method for the 6th aspect is included in and is arranged in the elongated dimension tobacco rod in the embolism of filtering material.

The method of the 5th or the 6th aspect preferably includes the step of the tobacco core being introduced basically the center of filtering material.When can being included in the tow (tow) that forms filtering material around the tobacco core, this method uses the guide means guide tobacco.Guiding device can comprise conduit, by this conduit towing tobacco.Along with core leaves guiding device, it preferably is filtered material and centers on.

Can with any combination with described all features of this paper (comprising any claim of enclosing, summary and accompanying drawing) and/or so disclosed any method or process in steps with above-mentioned aspect in any combination, at least some combinations repelled mutually in these features and/or step.

Description of drawings

In order to understand the present invention better, and illustrate embodiments of the invention are come into force, will carry out reference to accompanying drawing in the mode of example now, in the accompanying drawings:

Fig. 1 illustrates the perspective view of smoking product, this smoking product comprise smokeable material rod, be attached at together yew paper according to filter of the present invention with described rod and filter;

Fig. 2 illustrates the sectional view according to first embodiment of filter of the present invention;

Fig. 3 illustrates the sectional view of second embodiment of filter; And

Fig. 4 illustrates the sectional view of the 3rd embodiment of filter.

The specific embodiment

With reference to figure 1, show the smoking product 2 of cigarette form, it comprises according to filter 4 of the present invention.Even accompanying drawing is shown cigarette with smoking product 2, will be appreciated that smoking product 2 can take other form, such as cigar and cigarlet etc., it also can comprise according to filter 4 of the present invention.

With reference to figure 1, smoking product 2 comprises the rod of wrapping up in such as the paper bag of the substantial cylindrical of the smokeable material of tobacco 6, and it is coaxially attached to filter 4 by yew paper 8, and yew paper 8 is bonded in around the end of filter 4 and rod 6.

With reference to figure 2, show first embodiment of the filter 4 that is attached to tobacco rod 6.In the present embodiment, filter 4 is made of the single filter cell 12 of about 27 mm of length, filter cell 12 by filtering material 20(for example with 9 mm diameters, cellulose acetate) continuous embolism form.Filter cell 12 has the

end face

22,24 of first and second circular and is substantially perpendicular to the circumference of first and second end faces 22,24 or the side surface 26 of longitudinal extension.

As shown in Figure 2, the cylindrical tobacco core 10 with 3 mm diameters extends through the embolism of filtering material 20 between two end faces 22,24.For tobacco being remained core 10, it is wrapped in embolism wrappage or the cigarette paper 11.Paper 11 is air permeables basically, makes the cigarette therefrom to pass through when smoker inhales.Tobacco core 10 is substantially parallel with the longitudinal extension surface 26 of filter cell 12, and extends through the center of the embolism of filtering material 20 basically.

In certain embodiments, tobacco core 10 stems from tobacco rod, tobacco rod may be used for the manufacturing of ultra-fine cigarette in addition, 5 mm * 99 mm) or Kent Nanotek(size the example of ultra-fine cigarette is with trade mark Vogue(size:: 5 mm * 83 mm) sell, it can obtain from British American Tobacco, and can obtain in Europe and Russia.It is contemplated that tobacco core 10 is made up of pipe tobacco sheet, tobacco mixture or pipe tobacco stem, it is wrapped in embolism wrappage or the cigarette paper 11.Therefore, use the tobacco rod section of the suitable ultra-fine cigarette of forming by the tobacco core that is wrapped in the cigarette paper to form tobacco core 10 in the embolism wrappage 11 that is wrapped in filter cell 12 of the present invention.

The diameter of the tobacco core 10 that is wrapped is about 3 mm, its be introduced into subsequently filtering material 20 in the heart.When making filter cell 12 that a kind of method in the embolism of tobacco core 10 introducing filtering materials 20 is as follows.This method comprises the inner chamber of the conduit of towing tobacco core 10 by having about 5 mm diameters.Simultaneously, make for example cellulose acetate of fiber filter material 20() supply by a series of bloom roll, thereby eliminate its fold.Then, along with the filtering material 20 that is eliminated fold leaves conduit and forms the tow of the filtering material 20 that is eliminated fold on every side at core 10, thereby seal the continuous rod of the filtering material 20 of the tobacco core 10 that is wrapped with formation.Then, this rod can be cut into the section of suitable length to produce finished product filter cell 12 as shown in Figure 2.The length of filter cell 12 will depend on the type of desired filter 4.For example, the length of standard cigarette filter 4 is about 27 mm.In the embodiment shown in Figure 2, total 27 mm length of filter 4 are made up of filter cell 12, make core 10 whole process extend.Yet Fig. 3 and Fig. 4 show other embodiment, and be wherein as described below, and filter 4 comprises the shorter section of filter cell 12, and itself and other section comprises core 10 combinedly.

With reference to figure 3, show second embodiment of the filter 4 that is attached to tobacco rod 6.Filter 4 comprises a plurality of different

discrete filter cells

12,14,16, its each can have different materials and form.In the present embodiment, filter 4 comprises three

different filter cells

12,14,16.Each

filter cell

12,14,16 roughly is being columniform in shape, has the diameter that equates basically.Each

filter cell

12,12,16 is wrapped up by one deck sheeting, and this layer sheeting takes to be called the form of the wrapping paper of embolism wrappage (not shown), and it can be formed by conventional paper material.Apart from tobacco rod 6 farthest the filter cell 16 of (and it in use will be nearest apart from smoker's mouth) comprise that filtering material 20(is such as cellulose acetate) the tow of substantial cylindrical.Filtering material 20 provides filter, and when the smoker was air-breathing on cigarette, cigarette can pass through this filter.The filter cell 12 that is adjacent to element 16 settings comprises the continuous embolism of filtering material 20, and it has the tobacco core 10 that longitudinally therefrom extends through basically.This filter cell 12 is with shown in Figure 1 similar, except it does not extend along the whole length of filter 4.

Be arranged on the embolism that the filter cell 12 that comprises tobacco core 10 and the 3rd filter cell 14 between the tobacco rod 6 comprise filtering material 20, be dispersed in this embolism such as the absorbent of activated carbon 18.Activated carbon 18 can be taked the form of granule activated carbon 18, and as known in the art and as shown in Figure 3, it is dispersed throughout the volume of the embolism of the cellulose acetate 20 of taking " Dalmatian " pattern equably.Replacedly, activated carbon 18 can be spread across on the tacky outer surfaces 26 of embolism of cellulose acetate 20, perhaps adhere to around the inner surface of the embolism wrappage of cellulose acetate, perhaps can adhere to not shown by cellulose acetate 20() the cotton thread that centers on of embolism.Activated carbon 18 can also be maintained in the cavity that is centered on by the embolism of cellulose acetate 20.It is in order to improve the characteristic of the smog that is inhaled into by the removal toxic chemical that activated carbon 18 is provided.

With reference to figure 4, show the 3rd embodiment of the filter 4 that is attached to tobacco rod 6.In the present embodiment, the same three

filter cells

12,14,16 that comprise among filter 4 and above-mentioned second embodiment are except that the order of element has changed.As shown in Figure 4, as in a second embodiment, comprise filtering material 20 apart from tobacco rod 6 filter cell 16 farthest, such as cellulose acetate.Yet in the 3rd embodiment, the filter cell 12 that is adjacent to element 16 settings comprises the embolism of filtering material 20, and the particle of activated carbon 18 is dispersed in this embolism.At last, be arranged on the continuous embolism that the 3rd filter cell 12 between element 14 and the tobacco rod 6 comprises filtering material 20, tobacco core 10 therefrom extends through.Therefore, the position of

filter cell

12,14 is exchanged in the second and the 3rd embodiment.

As shown in Figure 3 and Figure 4,

filter cell

12,14,16 is arranged longitudinally that mutually the

end face

22,24 of each

filter cell

12,14,16 is in abutting connection with next.Though it is basic equating that three

filter cells

12,14,16 are shown on the length in Fig. 3 and Fig. 4, will be appreciated that it can have different length.For example, in Fig. 3 and Fig. 4, the length that comprises the filter cell 12 of tobacco core 10 can be 12 mm, and

other element

14,16 each can be 7.5 mm, make that the total length of filter 4 is 27 mm.In addition, will be appreciated that filter 4 can only comprise two filter cells.For example, filter 4 can comprise that about 15 mm of the filter cell 12(that comprises tobacco core 10 are long according to arbitrary order) and about 12 mm of filter cell 16(that only comprise filtering material 20 grow).Replacedly, filter 4 can comprise filter cell 12 that comprises tobacco core 10 and the filter cell 14 that comprises activated carbon 18 according to arbitrary order.

And filter 4 can comprise more than three

filter cells

12,14,16.For example, as mentioned above, filter 4 can comprise first and second filter cells 16 be made up of cellulose acetate, comprise the 3rd filter cell 14 of cellulose acetate and activated carbon 18 and comprise the 4th filter cell 12 of vertical tobacco core 10.Will be appreciated that and in filter 4, to arrange

various filter cells

12,14,16 with multiple replacement order.Yet, in each embodiment, comprised at least one filter cell 12 that comprises tobacco core 10 in the filter 4.

Refer again to Fig. 1, filter 4 is positioned at the mouth end place of smoking product 2, makes to comprise that the air-flow from the smog of rod 6 suctions of smokeable material passed filter 4 before entering smoker's mouth.As described about Fig. 2, tobacco core 10 is arranged in one or more filter cells 12, and longitudinally extends between the

end face

22,24 of the embolism of filtering material 20.Like this, tobacco core 10 be set to when air-flow passes filter 4 and the path of air-flow closely approaching, therefore and can before air-flow arrives smoker's mouth, influence the various characteristics of air-flow.

Tobacco core 10 can for example influence the gross properties of air-flow, makes the taste of air-flow and fragrance improve.An application of tobacco core 10 is that recover may be along with air-flow passes filtering material 20 or activated carbon 18 and the taste to a certain degree and the aromatic property of the air-flow of loss, known taste and the fragrance that should loss influences tobacco smoke.The inventor has found the embolism that tobacco core 10 is arranged to longitudinally to extend through filtering material 20 has been improved the fragrance of smog amazedly under the situation of the flow behavior of not damaging smog.The present invention also comprises the further modifications and changes that drop in the claim scope.

Claims

1. filter cell that is used for smoking product, described filter cell comprise the embolism of filtering material, basically longitudinally extend through described filtering material embolism the tobacco core and be wrapped in Wrap device around at least a portion on longitudinal extension surface of described tobacco core.

2. filter cell according to claim 1, wherein, described tobacco core longitudinally extends between the mutual opposing end faces of the embolism of described filtering material basically.

3. filter cell according to claim 2, wherein, described tobacco core is along extending with the substantially parallel direction in the side of the embolism of described filtering material, and described side is substantially perpendicular to one or two end face.

4. according to the described filter cell of any aforementioned claim, wherein, described tobacco core extends through the inside of described filtering material and is centered on by described filtering material.

5. according to the described filter cell of any aforementioned claim, wherein, described tobacco core extends through the center of the embolism of described filtering material basically.

6. according to the described filter cell of any aforementioned claim, wherein, described tobacco core comprises tobacco leaf silk, powdered tobacco, reconstituted tobacco, cigarette fibre, tobacco sheet, pipe tobacco sheet, tobacco mixture and/or tobacco stem.

7. according to the described filter cell of any aforementioned claim, wherein, described tobacco core shape is columniform basically.

8. according to the described filter cell of any aforementioned claim, wherein, but described Wrap device is an air permeable basically.

9. according to the described filter cell of any aforementioned claim, wherein, described Wrap device is formed by any conventional paper material.

10. according to the described filter cell of any aforementioned claim, wherein, described Wrap device contacts with whole basically longitudinal extension side of described tobacco core.

11. according to the described filter cell of any aforementioned claim, wherein, described tobacco core comprises or stems from least vertically section of the tobacco rod of smoking product.

12. filter cell that is used for smoking product, described filter cell comprises the embolism of filtering material and longitudinally extends through the tobacco core of the embolism of described filtering material basically, wherein, described tobacco core comprises or stems from vertical section of the tobacco rod of smoking product.

13. filter cell according to claim 12, wherein, described tobacco core comprises or stems from vertical section of the tobacco rod of elongated dimension smoking product.

14. according to the described filter cell of any aforementioned claim, wherein, the diameter of the described tobacco core in the described filter cell is between 3 mm and 8 mm, preferably diameter is between 4 mm and 6 mm.

15. according to the described filter cell of any aforementioned claim, wherein, described filtering material comprises cellulose acetate.

16. according to the described filter cell of any aforementioned claim, wherein, the diameter of the embolism of described filtering material is between 5 mm and 15 mm, preferably between 7 mm and 9 mm.

17. a filter that is used for smoking product, described filter comprise according to the described filter cell of any aforementioned claim.

18. filter according to claim 17, wherein, described filter comprises a plurality of filter cells, and at least one in described a plurality of filter cells is according to each described filter cell among the claim 1-16.

19. according to claim 17 or the described filter of claim 18, wherein, described filter comprises the absorbent filter cell, described absorbent filter cell comprises absorber material.

20. filter according to claim 19, wherein, described absorber material is an activated carbon.

21. according to each described filter among the claim 17-20, wherein, described filter comprises filter cell, this filter cell comprises filtering material and does not comprise tobacco core or absorber material.

22. a smoking product, described smoking product comprise according to each described filter cell among the claim 1-16 or according to each described filter among the claim 17-21.

23. a manufacturing is used for the method for the filter cell of smoking product, described method comprises that the embolism by filtering material provides the tobacco core, wherein, described tobacco core longitudinally extends through the embolism of described filtering material basically, and wherein, Wrap device is wrapped in around at least a portion on longitudinal extension surface of described tobacco core.

24. a manufacturing is used for the method for the filter cell of smoking product, described method comprises that the embolism by filtering material provides the tobacco core, wherein, described tobacco core longitudinally extends through the embolism of described filtering material basically, and wherein, described tobacco core comprises or stems from vertical section of the tobacco rod of smoking product.

25. method according to claim 24, wherein, described method comprises step: arrange vertical section of the tobacco rod of elongated dimension smoking product, make it longitudinally extend through the embolism of described filtering material basically.

26. according to each described method among the claim 23-25, wherein, described method comprises introduces the step at the center of described filtering material basically with described tobacco core.