CN103281919A

CN103281919A - Tobacco smoke filter

Info

Publication number: CN103281919A
Application number: CN2011800475240A
Authority: CN
Inventors: 保罗·F·克拉克; 帕特里克·G·梅雷迪思
Original assignee: Filtrona International Ltd
Current assignee: Filtrona International Ltd
Priority date: 2010-09-29
Filing date: 2011-09-27
Publication date: 2013-09-04
Anticipated expiration: 2031-09-27
Also published as: LT2621294T; CN103281919B; KR101987886B1; RU2603597C2; PL2621294T3; TWI589233B; JP2013538580A; TW201216873A; EP2621294B1; JP6462212B2; RU2013114719A; GB201016387D0; WO2012042199A1; HUE045486T2; EP2621294A1; KR20130139266A

Abstract

A tobacco smoke filter or filter element comprises: a longitudinally extending core of tobacco smoke filtering material including an additive spaced longitudinally from a first end of the core; a first wrapper around the core; and a second wrapper around the first wrapper; the first wrapper defining at least with (e.g. between itself and) the second wrapper at least one channel (e.g. 5 to 23 channels) extending longitudinally of the filter from at least one end thereof.

Description

Cigarette filter

Technical field

The present invention relates to filter and filter cell for the tobacco product of for example cigarette.

Background technology

Especially the cigarette filter of activated carbon is well-known in tobacco industry to comprise the particulate additive.Most of this filter comprises longitudinally some parts of adjacency, and wherein, mouth end section does not comprise any particulate additive, therefore presents acceptable end outward appearance, and Upstream section one or more comprise or comprise the particle additive.As everyone knows, because the multistage filter need be made each section and subsequently different sections correctly arranged and splice to form the multistage filter rod by the process of separating, therefore produce this multistage filter than " single hop " filter [single hop formed by a section (exclusive) of filtering material rather than by two sections of filtering material or more multistage form] more complicated and more expensive; The single hop filter can for example be made in a process by single machine.

The applicant is developing " single carbon " filter before---and be the single hop filter, the single hop filter that comprises carbon has at least one end and does not have the particle additive and can make in a process.There are ' active tablet ' (seeing GB2261152) and ' smooth core ' (seeing WO2006/059134) filter.These are respectively being feature on the inner surface portion of wrapping paper or at the particle additive of the pod that is arranged in the center.

The inventor has also developed ' CPF ' filter (for example seeing GB2133269).It is feature with the inner packing, and this inner packing has embossed grooves and comparison with standard cellulose acetate filter at its partial-length the advantage that the pressure of the filter efficiency of the raising of providing and/or reduction descends is provided.In addition, ' CPF ' filter can provide distinctive end outward appearance.This filter can be as the single hop filter or as one section in the multistage filter.In GB2261152, proposed the CPF filter characteristic and can be combined with the feature of active tablet filter and comprise for example single hop CPF filter of carbon with generation.This filter can be called ' APF/CPF '.But the inferior position of these filters is that the carbon of its higher degree carries (' CCO ')---namely, in manufacture process, discrete carbon granule may inadvertently be transferred to the grooved area of inner packing, there, their filter outward appearances of may making dirty.In the filter manufacture process, be difficult to remove described discrete granule.

Summary of the invention

According to the present invention, a kind of (for example single hop) cigarette filter or filter cell is provided, it comprises: the longitudinal extension of cigarette filter material (for example single hop) core, and it comprises with first (downstream) of core holds longitudinally isolated additive (for example particle additive); Surround (for example ventilative material) first wrapping paper of core; And second wrapping paper that surrounds first wrapping paper; First wrapping paper at least and second wrapping paper (for example between first wrapping paper and second wrapping paper) limit at least one passage from least one end of filter along the longitudinal extension of filter.Preferably, first wrapping paper (at least with second wrapping paper) limits from least one passage of first (downstream) the end longitudinal extension of filter.Preferably, first wrapping paper at least and second wrapping paper (for example between first wrapping paper and second wrapping paper) limit at least 5 passages (for example 5 to 23 passages, for example 9 to 20 passages) from least one end of filter along the longitudinal extension of filter.Filter or filter cell that girth is approximately 24-25mm can comprise for example 14 to 20 passages.Filter or filter cell that girth is approximately 16-17mm can comprise for example 9 to 14 passages.

First (downstream) end of particle additive and core longitudinally spaced apart (being spaced a distance) makes the particle additive invisible from first (downstream or the mouth) end of core.In example, the longitudinal extension core of cigarette filter material comprises (for example single hop) the bar core with the cigarette filter material that is surrounded (embeddings) therein one (or at least one) additive (for example particle additive) bag fully.The bar core of cigarette filter material can have the additional package paper (for example with holes or not with holes) that engages around the bar core selectively.Provide the bag that is surrounded fully of additive to have the longitudinally effect of spaced apart (being spaced a distance) of first (downstream) end (having cigarette filter material because of between first end at additive pockets and core) with additive and core at the in-core of cigarette filter material.

The present invention according to first aspect, a kind of (single hop) cigarette filter or filter cell are provided, it comprises: the longitudinal extension of cigarette filter material (single hop) core, and it comprises with first (downstream) of core holds longitudinally isolated additive (as the particle additive); Surround (for example gas permeable material) first wrapping paper of core; And second wrapping paper that surrounds first wrapping paper, first wrapping paper at least and second wrapping paper (for example between first wrapping paper and second wrapping paper) limit from least one passage of the filter of filter one end longitudinal extension; Wherein, the longitudinal extension core of cigarette filter material comprises fully the bar core of the cigarette filter material that surrounds (for example embedding) therein one (or at least one) additive (for example particle additive) bag.Preferably, first wrapping paper at least and second wrapping paper (for example between first wrapping paper and second wrapping paper) limit from least 5 passages (for example 5 to 23 passages, for example 9 to 20 passages) of the filter of at least one end longitudinal extension of filter.Filter or filter cell that girth is approximately 24-25mm can comprise for example 14 to 20 passages.Filter or filter cell that girth is approximately 16-17mm can comprise for example 9 to 14 passages.

Preferably, first wrapping paper is made by ventilative material.In other words, preferably, first wrapping paper is ventilative wrapping paper.First wrapping paper can be the ventilative filter paper ventilative filter paper of fold (for example with) or the cellulose acetate ventilative cellulose acetate of fold (for example with) filter paper for example.

Preferably, first wrapping paper is the band fold, thus at least and second wrapping paper (for example between first wrapping paper and second wrapping paper) (restriction) passage from least one end of filter along the longitudinal extension of filter is provided.First wrapping paper can be the band fold, and fold [for example with second wrapping paper] provides 5 or the more passage of (restriction) filter from least one end longitudinal extension of filter, for example 5 to 23 passages, for example 9 to 20 passages.(being provided by fold) 14 to 20 passages for example can be provided for filter or filter cell that girth is approximately 24-25mm.(being provided by fold) 9 to 14 passages for example can be provided for filter or filter cell that girth is approximately 16-17mm.In the literary composition, (corrugated) of term band fold (corrugate) or band fold comprises the meaning that forms the collapsed shape that comprises projection parallel and that replace and groove.

Preferably, the fold in first wrapping paper is (for example forming by the impression first wrapping paper material) embossed grooves.First wrapping paper can for example be the paper with (for example impression, band fold) contour surface, and paper bag is wrapped up in core and made contour surface and second wrapping paper formation passage facing to second wrapping paper (namely facing to radial outside).First wrapping paper parcel core that is appreciated that the band fold makes fold (and passage) along the axial direction of core (as haply longitudinally) orientation longitudinally.Each passage can be provided by the fold of first wrapping paper, and---filter end that this end begins to extend away from passage---closed or sealing preferably at end position.Usually, wicking surface is consistent with (profile) surface towards radially inner side (i.e. the surface in the face of core of first wrapping paper) of first wrapping paper.In another example, wicking surface is not consistent with (profile) surface towards radially inner side of first wrapping paper; In this embodiment, first wrapping paper can limit longitudinally extending channels with core and second wrapping paper.In another example, first wrapping paper only has profile on a surface, the paper of parcel core makes contour surface to second wrapping paper (namely towards radial outside) in order to form passage with second wrapping paper, the wicking surface that is wrapped up is consistent with the inner surface of fold with the profile of first wrapping paper, makes passage only between first wrapping paper and second wrapping paper.

Therefore, the present invention can provide the single hop filter, the single hop filter has the center of being presented axially in ' pod ' or fills the bag of granulated carbon (for example described in the WO2006/059134) and band fold inner packing, band fold inner packing is fluted at its partial-length impression, and groove (with second wrapping paper) forms passage.In this mode, can avoid the CCO inferior position of production cost and complexity and the APF/CPF single hop filter relevant with the multistage filter of particle bearing.In addition, this mode can be implemented in the high-freedom degree in the filter design.Length and these parameters of position of groove part by control as the size of center pod (bag) and position and first (interior) wrapping paper can make smog pass through filter in the mode that can change strainability, sense of taste experience and end outward appearance.For example, when using the middle pod of active carbon particle, if passage (trench region) occupies the longitudinal region close with pod of filter, then can guide smog away from pod, therefore produce less ' carbon flavor ' for the smoker.On the contrary, if passage (trench region) has occupied the longitudinal region different with pod of filter, then smog preferentially is conducted through pod, therefore produces more ' carbon flavor ' (if pod comprises carbon) or other sense of taste (if pod comprises other fumet) for the smoker.In addition, this filter traditional ' level and smooth core ' filter can be realized the pressure drop that (under same pressure drop) higher tar keeps or (retaining at identical tar) reduces.

The longitudinal extension core of cigarette filter material (for example single hop longitudinal extension core) can have the single bag of additive (for example particle additive) that is fully enclosed in wherein, and this single bag of additive is near second end (for example upstream cigarette end in the cigarette of band filter) and away from first end (for example downstream or mouthful end or mouth end) or near first end (but longitudinally spaced apart with first end) and away from second end.The longitudinal extension core of cigarette filter material can have be fully enclosed in wherein be positioned to second end of core (for example cigarette end) and with the equidistant single bag of additive of first end (for example mouth end) (for example particle additive) of core.Single longitudinal extension core of cigarette filter material can have additive (for example particle additive) bag that is fully enclosed in one or more (for example two, three, four) separation.The additive pockets of being surrounded (for example embedding) fully can be to an end or two ends convergent---oval in configuration normally for example.If the additive pockets of surpassing is arranged, then it can have equal longitudinal separation.The layout of other bag is possible, and---for example replacing than short longitudinal separation and than long interval relatively---can realize this layout by suitable adjustment manufacture process.For example by disclosed method and apparatus among the WO2006/059134, can make the longitudinal extension core of cigarette filter material, it comprises the bar core with the cigarette filter material that is surrounded (for example embedding) therein one (perhaps at least one) additive (for example particle additive) bag fully.

Filtering material can be that for example tradition is used for any of the material that cigarette filter makes (be generally filamentous, fibrous, netted or extruding).Filtering material can be cotton or natural or synthetic filaments bundles or the cellulose acetate filaments bundle of polyethylene or polyacrylic plastics for example for example.Can be for example natural or synthetic short fiber, cotton wool, the Web materials such as paper (fold usually), synthetic non-woven material and extrded material (for example starch, synthetic foam).

Additive can be the particle additive.The particle additive can be any particle additive that is suitable for cigarette filter---for example activated carbon, zeolite, ion exchange resin (for example weak-base anion-exchange resin), sepiolite, silica gel, aluminium oxide, molecular sieve, carbon containing polymer resin, diatomite.The particle additive can be two kinds or more of mixtures of material.Additive can comprise smog modifier (for example spices).This can be known or be suitable for for example arbitrary smog modifier (for example spices) of cigarette of tobacco product, for example such as the spices of menthol, spearmint, cloves wet goods.Spices can be the known any spices for cigarette filter or filter cell.For example, spices can be menthol, spearmint, peppermint, nutmeg, Chinese cassia tree, cloves, lemon, chocolate, peach, strawberry, vanilla etc.Preferred smog modifier (spices) is menthol.For example, additive can be the sepiolite granule that has applied menthol flavor.If the longitudinal extension core of cigarette filter comprises embedding (as embedding) additive pockets of being surrounded fully wherein, then additive can be the particle additive (seeing above) of for example active carbon, it is for example as the separation bag of the particle of particle additive or pod and be enclosed in the filtering material, and the particle of particle additive separates with filtering material basically and is fully enclosed in the filtering material.In another example, the additive pockets of being surrounded (for example embedding) fully can be breakable capsule, perhaps one or more fragile microcapsule.Capsule or microcapsules can comprise multiple medium---for example for example assist smog to filter such as the smog modifier of spices (spices As mentioned above) and/or liquid, solid-state or other material.It is known using capsule or microcapsules in the art.

For the long filter of 20mm to 30mm, the additive of the longitudinal extension in-core that is fully enclosed in cigarette filter material of each filter (the about 0.5g/cm of density for example ³The particle additive) weight can be for example between 10mm to 65mg, for example between 20mm to 50mg, for example between 25mm to 40mg.For the long filter of 20mm to 30mm, the weight of first additive of each filter can be for example between 40mm to 65mg (for example high filler loading capacity) if desired.For the long filter of 20mm to 30mm, the weight of first additive of each filter can be for example between 10mm to 40mg (for example lower if desired loading).

Filter or filter cell can comprise from first (downstream) end of filter to be held along at least one passage of the longitudinal extension of filter along at least one passage of the longitudinal extension of filter with from second (upstream) of filter, and each passage only extends the part of core length.

(one or more) passage can extend longitudinally to second (upstream) end of filter from first (downstream) end of filter.Yet preferably, at least a portion of filter or filter cell does not comprise along the passage of its length longitudinal extension (that is, passage does not extend longitudinally to second (upstream) end of filter from first (downstream) end of filter).

Filter or filter cell may comprise nearly 23,14 to 20 passages (for the filter/element of about 25mm girth) from (perhaps two) end longitudinal extension of filter or filter cell preferably.Filter or filter cell can comprise 5 or more passage, for example 5 to 23,14 to 20 passages from (perhaps two) end longitudinal extension of filter or filter cell (for example 9 to 14 passages or 14 to 20 passages) preferably.Total cross-sectional area of these passages can amount to filter or filter cell total cross-sectional area 2 to 12% between, preferably at least 4%, more preferably between 4% to 8%.Thus, quantity and/or the careful control on the degree of depth (for example first wrapping paper being impressed with controlling) at passage can provide improved strainability.This can by be increased in depth of folding in first wrapping paper, preferably to increase the wrinkled surface that can be used for smog simultaneously long-pending and selectively increase the fold spacing then---namely, by the width that reduces to increase fold of fold quantity---be achieved.For example, can have according to filter of the present invention that about 0.45mm is dark, 15 passages of about 1.5mm spacing in the one or both ends of filter; Another filter can have the dark passage of 0.32mm, is 23 in the quantity (at every end or arbitrary end) of the spacing lower channel of 1.05mm.Be invalid because thereby the top of fold leans against on the overwrap usually for filter, it is long-pending that the area that therefore can be used for the fold packing that smog filters in these examples is slightly smaller than total wrinkled surface usually.The filter of about 24 to 25mm girths or filter cell can comprise for example 14 to 20 passages.The filter of about 16 to 17mm girths or filter cell can comprise for example 9 to 14 passages.

Cigarette filter length can be 15 to 40mm, for example 17 to 35mm, for example 20 to 30mm.The girth of cigarette filter can be 14 to 28mm, for example 16 to 26mm, for example 16 to 17mm or 24 to 25mm.

Preferably, the length of each passage be 2mm or bigger, preferably between 2.5mm to 23mm, more preferably between 3mm to 15mm, further preferably between 3.5mm to 9mm.Can be different with the length of the passage that extends from the other end (if existence) from the passage that an end (upstream or downstream) extends, perhaps they can be equal length.Passage can be 7 to 8mm length.Passage can be 3 to 4mm length, and for example 3.75mm is long.In one example, passage only extends and is 7 to 8mm long from an end (upstream or downstream).In another example, passage is 3 to 4mm length from the extension of upstream and downstream end and (at every end).

Although can change form, passage will be preferably be the identical haply degree of depth at its longitudinal length, for example at passage near the blind end place.

Complete filter of the present invention can have breathable second wrapping paper (it can be natural ventilative material and/or porose) that surrounds first (as the band fold) wrapping paper.This ventilative overwrap can be top overwrap (tipping overwrap), and filter is combined in the band filter cigarettes by the top overwrap, and this overwrap is only used in the stage in cigarette manufacture.In the case, filter rod utilizes first wrapping paper of exposure to generate at first, and the complete filter that the present invention includes this (seeing below) and be attached with overwrap.Thus, the present invention according on the other hand provides (for example single hop) cigarette filter or filter cell, and it comprises: comprise the longitudinal extension core of holding the cigarette filter material of isolated additive (for example particle additive) with first (downstream) of core; Surround (for example ventilative material) first wrapping paper of core; First wrapping paper is the band fold, and fold (on its radially outer face) limits at least one passage from an end of filter along the longitudinal extension of filter; Wherein, the longitudinal extension core of cigarette filter material comprises the bar core of cigarette filter material, and the bar core of this cigarette filter material has (for example the embedding) that be fully enclosed in wherein (or at least one) additive (for example particle additive) bag.

Filter also can be used for being combined with air-locked second wrapping paper such as the top overwrap.

The part (or various piece) (for example part or the various piece first packing paper tape fold, that the fold place is arranged as impression) that comprises the filter of vertical passage is called groove or channel portions in the text.(on the entire cross section) of filter do not comprise the portion (or each one) of vertical passage or part (or various piece) (for example first wrapping paper be smooth, as impression/with the various piece of fold) be called handle or shank portion in the text.In one example, filter according to the present invention comprises the channel portions of 3mm and as the single central shank part of all the other whole length of filter at every end.This configuration has another advantage: can reduce the amount of the filtering material (for example acetate tow) in core, fall because the pressure that (PD/mm) be higher than groove falls in the pressure of handle.This configuration also can provide more gratifying end outward appearance.

In another example of the present invention, cigarette filter also comprises (for example being limited by first wrapping paper and second wrapping paper) at least one passage, at least one passage along the longitudinal extension of filter and only extend core length a part but from the upstream of filter or downstream extend.In this example of the present invention, cigarette is included in one or more vertical passage (channel portions) at the place, wherein one or both ends of the upstream extremity of filter and downstream; And the other vertical passage in filter (other channel portions).In this example, filter does not have vertical passage (more than a shank portion) more than a part or a section.Filter can have additional groove and/or handle zone.

In band filter cigarettes according to the present invention, filter of the present invention (filter that perhaps comprises filter cell of the present invention) is engaged to the tobacco rod of packing towards the mode of pipe tobacco with an end of this filter.Filter can for example encircle (ring tipping) [this top ring only engages so that the most of exposure of filter packing at the abutting end of (packing) filter and bar] by the top or more preferably be engaged to the tobacco rod of packing by top external packing completely (this top external packing completely engages at the abutting end of whole filter length and tobacco rod).

Can be stuffy or can ventilate by method known in the art according to any filter of the present invention or band filter cigarettes, for example by using laser beam perforation and the top external packing of pre-punching or ventilative wrapping paper (plug packing (plugwrap)) and/or wrapping paper (plug is packed (plugwrap)).The complete top external packing of ventilating can be natural breathable equally or be provided with air vent, and in the ventilating product that filter plug is packed and complete top external packing all exists, align usually with by filling in the packing ventilation by the external packing ventilation.By the air vent of filter plug packing or by the air vent of top external packing or can in the generative process of filter or band filter cigarettes, make by laser beam perforation by both air vents simultaneously.

Ventilation in filter according to the present invention or band filter cigarettes is along under the situation of vertical local positioning of product, according to required ventilation and filter capability, this part preferably near the upstream, downstream that are selected from additive or additive pockets and with one or two zones of aliging with it.The ventilation that is positioned at the upstream of first additive pockets and/or aligns with first additive pockets is normally preferred.When two or more additive occurring, can between the part (or bag or piece) of second additive, exist and ventilate.

According to the present invention on the other hand, provide multiple, this multiple comprises in as indicated above and/or the literary composition with whole a plurality of (for example 2,4,6 the etc.) filter (perhaps filter cell) that engages of minute surface relation head and the tail.

Description of drawings

Now present invention is described with reference to following example and accompanying drawing, and wherein, Fig. 1 has schematically shown filter according to the embodiment of the present invention; Fig. 2 has schematically shown the filter according to second embodiment of the invention; Fig. 3 has schematically shown according to the present invention the filter of another embodiment.

The specific embodiment

Fig. 1,2 and 3 shows the example of " level and smooth core " CPF filter.

Fig. 1 shows the single hop cigarette filter 1 of long 27mm and girth 24.5mm, cigarette filter 1 comprises the longitudinal extension core 2 with the cigarette filter material of the bar core form of cellulose acetate filtering material, longitudinal extension core 2 the core of core and filter have by surround fully (embeddings) therein with " pod " of the additive of particle 4 forms of activated carbon or bags 3.Core (pod filter cell) 2 can for example be formed by disclosed method among the WO2006/059134.First wrapping paper 5 of the ventilative filter paper cellulose acetate of fold (perhaps with) holds core 2 closely, first wrapping paper 5 (is namely holding the wrapping paper section of the part of core 2 except the mid portion of filter 1 or the circumferential section 6 with fold in the interlude, the part of this core 2 comprises bag or the pod of embedding) its whole length on vertical area fold (that is, so fold or groove extending axially along filter).Wicking surface is consistent with the fold in first wrapping paper 5.Second wrapping paper 10 with fold of ventilative paper holds first wrapping paper 5 closely and the fold in first wrapping paper 5 forms (restriction) passage 9a, 9b.Core and wrapping

paper

5 and 10 extend in the whole length of crossing filter 1.The circumferential section 6 with fold that comprises wrapping paper 5 in the filter mid portion does not have passage and

passage

9a, 9b not to penetrate the whole length of filter in meaning in this section.Therefore, filter 1 has one group of 15 passage 9a and second group of 15 passage 9b, one group 15 the long 7.5mm of passage 9a, be formed on first or downstream 11 places (being formed between second wrapping paper 10 with fold of the band fold part of first wrapping paper 5 and ventilative paper) of filter, second group 15 the long 7.5mm of passage 9b are positioned at second end or upstream extremity 13 places (being formed between the fold and second wrapping paper 10 with fold of first wrapping paper 5) of filter; These folds form part or the groove of groove at every

end

11,13 of filter 1.In the centre of filter, the district with fold of the wrapping paper 5 in circumferential section 6 is formed on the shank portion with fold or non-groove (handle) of long 12mm of the centre of filter.This shank portion has sealed the end of each passage, and this end is relative with the end of the filter that passage begins to extend.This shank portion of filter is not included in the longitudinally extending channels on the cross section of the whole length of shank portion.First wrapping paper of the formation of first wrapping paper of fold (for example by impression), fold can be by known method around the attaching of the attaching of core and second wrapping paper---the method realization of for example describing among the GB2133269.The process in the process of using first wrapping paper and the mid portion that pod is formed and is positioned at cartridge of being appreciated that is synchronous and aim at.

Filter 1 can for example be attached to cigarette by the top ring or by the external packing of complete top, and the method is well known in the art.Be appreciated that other material as known in the art can be used to form core 2 and wrapping

paper

5,10.

Therefore, filter comprises (band fold)

passage

9a, 9b (being groove) of impression at every end, and

passage

9a, 9b provide the outward appearance of filter two ends uniqueness; Filter has the not mid portion 6 (i.e. ' handle ') of impression.One bag of activated carbon granule is positioned at filter body, is close to be positioned at the zone that handle limits.In use, by 13 places are attached to the filter of cigarette (not shown) in the end, some smog directly enter in the core 2 and lead to the end 11 of filter 1, filter by contact with the filament that constitutes core, and the activated carbon in the contact bag.Smog is gone back admission passage 9b until not being with fold part (handle) 6 with the diluent air that sucks by ventilative wrapping paper 10, and then, the smog of dilution enters core 2 after by band

fold wrapping paper

5 and 11 places pass filter in the end; Therefore, this smog is by wrapping paper 5 and core 2 both filtrations.Be appreciated that about filter of the present invention and also can use with non-ventilated packaging paper, in this case, will be not by the diluent air in the wrapping paper inspiration filter.

Thus, the example of Fig. 1 is the single hop filter, bag (for example described in the WO2006/059134) and inner packing paper that this single hop filter has " pod " of particle additive or surrounded fully, " pod " or the bag that is surrounded fully are presented axially in the center, and inner packing paper is at its partial-length impression fluted (passage).Filter has been avoided the CCO inferior position (because activated carbon is positioned at pod or bag not on wrapping paper) of the manufacturing cost relevant with particle bearing multistage filter and complexity (because it is the single hop filter) and APF/CPF single hop filter.Fig. 1 example also shows by control size and the length of position and inner packing paper groove part and these parameters of position as center pod (bag), can make smog pass through filter in the mode that can change strainability, sense of taste experience and end outward appearance.As indicated above, smog is preferentially by the carbon pod, because trench region has occupied filter and different longitudinal region pod, therefore produces more ' carbon flavor ' for the smoker.In addition, filter is tradition ' level and smooth core ' filter, can realize that (under same pressure drop) higher tar keeps or (retaining at identical tar) lower pressure drop.Be appreciated that by different layouts is provided, wherein trench region occupies the longitudinal region close with pod of filter, can guide smog away from pod, produces less ' carbon flavor ' (see figure 3) for the smoker thus.

Fig. 2 shows another embodiment, and it has single trench region, and this list trench region presents distinctive mouth end outward appearance thus in the face of the mouth end (right-hand side in the accompanying drawing) of filter 31.Fig. 2 illustrates the single hop cigarette filter 21 of long 27mm, girth 24.5mm, it comprises the longitudinal extension core 22 with the cigarette filter material of the bar core form of cellulose acetate filtering material, longitudinal extension core 22 be positioned near second end of filter or upstream extremity 33 places have by surround fully (embeddings) therein with " pod " of the additive of active carbon particle 24 forms or bags 23.First wrapping paper 25 of ventilative filter paper hold closely core 22, the first wrapping papers 25 except near the circumference of second end of filter or upstream extremity 33 with its whole length of fold part 26 (namely holding the wrapping paper section of the part of the bag that comprises embedding of core 2 or pod) on vertical area fold.As the embodiment of Fig. 1, in the example of Fig. 2, wicking surface is consistent with the fold in first wrapping paper 25.Second wrapping paper 30 with fold of ventilative paper hold first wrapping paper 25 closely and in first wrapping paper 25 fold form (restriction) passage 29a.Core and wrapping

paper

25 and 30 extend in the whole length of crossing filter 1.The circumferential section 26 with fold that comprises wrapping paper 25 in the filter upstream portion does not have passage and passage 29a not to penetrate the whole length of filter in meaning in this section.Therefore, filter 21 has first end that was formed on filter or one group of passage 29a (for example 15 passage 29a) at downstream 31 places, this group of long 15mm of passage 29a, it is formed between second wrapping paper 30 with fold of the band fold part of first wrapping paper 25 and ventilative paper.These passages (fold) form channel portions or groove at downstream or mouth end 31 places of filter 1, and outward appearance provides distinctive end outward appearance at this place, end, and the handle zone is positioned at the other end of filter 1.The short grained bag of activated carbon is positioned at and is close to below, handle zone, near the pipe tobacco end of filter.

Fig. 3 shows another embodiment, and it has single trench region, and single trench region presents traditional mouth end outward appearance thus in the face of the pipe tobacco end (left-hand side in the accompanying drawing) of filter 53.The carbon pod also is positioned at the pipe tobacco end near filter, is close to consistent with the groove zone is arranged.Fig. 3 shows the cigarette filter 41 of long 27mm, girth 24.5mm, it comprises the longitudinal extension core 42 with the cigarette filter material of the bar core form of cellulose acetate filtering material, longitudinal extension core 42 be positioned near second end of filter or upstream extremity 53 places have by surround fully (embeddings) therein with " pod " of the additive of active carbon particle 44 forms or bags 43.First wrapping paper 45 of ventilative filter paper hold closely core 42, the first wrapping papers 45 except near the circumference of first end of filter or downstream with its whole length of the circumferential section 46 of fold (namely not holding the wrapping paper section of core 42 parts of the bag that comprises embedding or pod) on vertical area fold.Wicking surface is consistent with the fold in first wrapping paper 45.Second wrapping paper 50 with fold of ventilative paper holds first wrapping paper 45 closely and the fold in first wrapping paper 45 forms (restriction) passage 49b.Core and wrapping

paper

45 and 50 extend in the whole length of crossing filter 41.The circumferential section 46 with fold that comprises wrapping paper 45 in the filter downstream part means do not have passage and passage 49b not to penetrate the whole length of filter in this part.Therefore, filter 21 has second end that is formed on filter or one group of passage 49b (for example 15 passage 49b) at upstream extremity 51 places, this group of long 10mm of passage 49b is formed between second wrapping paper 50 with fold of the band fold part of first wrapping paper 45 and ventilative paper.These passages (fold) form channel portions or groove at upstream extremity 51 places of filter 41, and the handle zone is positioned at another (mouth) end of filter 41.

Claims

1. a cigarette filter or filter cell comprise: the longitudinal extension core of cigarette filter material, and described longitudinal extension core comprises the additive longitudinally-spaced with first end of described core; Surround first wrapping paper of described core; And second wrapping paper that surrounds described first wrapping paper; Described first wrapping paper at least and described second wrapping paper (for example between described first wrapping paper and described second wrapping paper) limit at least one passage from least one end of described filter along the longitudinal extension of described filter.

2. filter according to claim 1 or filter cell, wherein, the described longitudinal extension core of described cigarette filter material comprises the bar core of described cigarette filter material, described core has at least one additive pockets that is fully enclosed in wherein.

3. a cigarette filter or filter cell comprise: the longitudinal extension core of cigarette filter material, and described longitudinal extension core comprises the additive longitudinally-spaced with first end of described core; Surround first wrapping paper of described core; And second wrapping paper that surrounds described first wrapping paper; Described first wrapping paper limits at least one passage from an end of described filter along the longitudinal extension of described filter with described second wrapping paper at least, wherein, the described longitudinal extension core of described cigarette filter material comprises the bar core of cigarette filter material, and described core has at least one additive pockets that is fully enclosed in wherein.

4. according to each described filter or filter cell of aforementioned claim, wherein, described filter or described filter cell are filter or the filter cells of single hop.

5. according to each described filter or filter cell of aforementioned claim, wherein, described first wrapping paper is made by ventilative material.

6. according to each described filter or filter cell of aforementioned claim, wherein, described first wrapping paper is the band fold, and described fold limits 5 or more (for example 9 to 20) passage from least one end of described filter along the longitudinal extension of described filter.

7. according to each described filter or filter cell of aforementioned claim, wherein, described filtering material is for example cotton or such as the natural or synthetic filaments bundles of polyethylene or polyacrylic plastics, cellulose acetate filaments bundle, natural or synthetic staple, cotton wool, such as the Web materials of paper (for example fold paper), synthetic non-woven material or in the extrded material (for example starch, synthetic foam) one or more.

8. according to each described filter or filter cell of aforementioned claim, wherein, described additive is the particle additive.

9. filter according to claim 8 or filter cell, wherein, described particle additive is two or more of mixtures of activated carbon, zeolite, ion exchange resin (for example weak-base anion-exchange resin), sepiolite, silica gel, aluminium oxide, molecular sieve, carbon containing polymer resin, diatomite or these described additives.

10. according to each described filter or filter cell in the claim 1 to 7, wherein, the described additive in described additive pockets of being surrounded fully is breakable capsule or one or more fragile microcapsule.

11. according to the described filter of arbitrary aforementioned claim or filter cell, comprise spices.

12. a cigarette filter or filter cell comprise: the longitudinal extension core of cigarette filter material, described longitudinal extension core comprises the additive longitudinally-spaced with first end of described core; Surround first wrapping paper of described core; Described first wrapping paper is the band fold, and described fold limits at least one passage from an end of described filter along the longitudinal extension of described filter; Wherein, the described longitudinal extension core of described cigarette filter material comprises the bar core of described cigarette filter material, and described core has at least one additive pockets that is fully enclosed in wherein.

13. cigarette filter according to claim 12 or filter cell, wherein, described first wrapping paper is the band fold, and fold limits 5 or more (for example 9 to 20) passage from an end of described filter along the longitudinal extension of described filter.

14. cigarette filter of describing with reference to arbitrary accompanying drawing basically as hereinbefore.

15. a band filter cigarettes comprises that according to the described filter of arbitrary aforementioned claim, described filter is engaged to the tobacco rod of packing towards the mode of pipe tobacco with second end of described core.

16. multiple, it comprises a plurality of (for example 2,4,6 etc.) according to each described filter (perhaps filter cell) in the claim 1 to 14, described a plurality of filters (perhaps filter cell) integrally engage with minute surface relation head and the tail.