EP2367452A1

EP2367452A1 - Multi-filter for a smoking product

Info

Publication number: EP2367452A1
Application number: EP09749101A
Authority: EP
Inventors: Horst Grzonka; Markus Schosnig; Eduard Nica; Paulo Oliveira; Martin Duke; John Richardson; Maya Nikolaeva
Original assignee: British American Tobacco Germany GmbH; BAT Cigarettenfabriken GmbH
Current assignee: British American Tobacco Germany GmbH
Priority date: 2008-11-10
Filing date: 2009-11-04
Publication date: 2011-09-28
Also published as: JP5474994B2; UA98278C2; AU2009312803B2; KR20110084451A; MX2011004126A; KR101364013B1; US9961936B2; JP5806281B2; RU2588694C9; CA2740862A1; CN102209476B; JP2014076059A; DE102008056384B4; CN102209476A; WO2010052238A1; JP2012507996A; RU2011123092A; CA2740862C; AR076531A1; ZA201102646B

Abstract

Filter for a smoking product (1), comprising a first filter segment (2) and a second filter segment (3), wherein the first filter segment (2) comprises a component that is given off into a smoke stream passing through a filter outlet opening (4), and the second filter segment (3) comprises a sorption means (6) that absorbs a component from a smoke stream passing through the filter inlet opening (5).

Description

Multifilter for a smoking article

The invention relates to a ventilated multifilter for a Rauchartikei with at least two filter segments, wherein at least one filter segment comprises a component to be dispensed to the smoke component and at least one further filter segment comprises a sorbent, which receives at least one component of the smoke stream, and at least one Fiitersegment at least one recess having the peripheral surface

In the prior art cigarette filters are known, which are provided, for example, with activated charcoal particles, which absorb unwanted substances from the cigarette smoke. It is also possible that certain substances desired in cigarette smoke, such as flavorings, are disadvantageously removed from the cigarette smoke. This can negatively affect the taste of the cigarette.

It is the object of the present invention to provide a filter for a smoking article and further a method for the production thereof, wherein the filter removes unwanted components from the smoke stream but does not affect the taste of the smoking article.

This object is solved by the subject-matter of claims 1 and 13. The dependent claims define preferred embodiments of the present invention. The smoking article filter according to the invention has at least two filter segments. In this case, the first filter segment comprises a component which is discharged to a passing through a filter outlet smoke stream, wherein a second filter segment comprises a sorbent, which receives at least one component from a passing through the filter inlet opening smoke stream. In this context, the term "ingestion" is understood to mean both the adsorption of the component on the sorbent (adsorption) and the absorption of the component in the sorbent (absorption). In the broadest sense, any binding of the component to be removed by the sorbent should be referred to as "uptake". A filter segment is thus mixed with a sorbent or a substance, so that one or more undesired components are completely or partially removed or "filtered out" from the smoke stream. However, it is often unavoidable that desired components or substances, such as flavorings, are removed together with the undesirable components or substances from the smoke stream, so that the taste of the cigarette is adversely affected. For this purpose, the filter according to the invention comprises a further segment with one or more components, which is delivered to the smoke stream or the smoke stream is or will be. In particular, flavorings which are removed together with the undesired components from the smoke stream can be added back to the smoke stream later, in order not to adversely affect the original taste of the smoking article.

However, it is also conceivable that other or equivalent substances are added. Furthermore, these substances can be added in any amount, aiso in lower or higher concentration than the original concentration of this substance in the smoke stream, It is quite conceivable that the filter according to the invention comprises several segments, all one or more identical substances or different substances deliver the smoke stream. It is also conceivable that the filter according to the invention comprises a plurality of segments which "filter out" one, several or respectively different unwanted components from the smoke stream. So the number of segments is not limited to two segments, but may well have several identical or different segments, each of which absorb substances from the smoke stream or deliver to this.

In a preferred embodiment, the filter comprises two filter segments, the first being a fitter segment comprising a component to be delivered to the smoke stream and the second a filter segment comprising a sorbent capable of receiving one or more components from the smoke stream. Here, the first filter segment is intended to be arranged in a region of the filter facing away from the smokable material, that is to say from the tobacco rod, while the second filter segment is arranged in a region of the filter facing the smokable material of the smoking article. In other words, the second filter segment is arranged between the tobacco rod and the first filter segment. Thus, therefore, the smoke stream coming from the smokable material is first passed through the second filter segment and cleaned of unwanted components, the smoke stream then passing through the first filter segment where it is subsequently spiked with a desired component before ultimately exiting the smoking article. Of course, the reverse case is also conceivable, namely that the unfiltered smoke stream is first mixed with a component to be added and only then unwanted components are removed from the smoke stream. This could be the case, for example, if the sorption medium receiving the undesired components! can accommodate only a certain proportion of desired components of the smoke flow in the second filter segment, so that after filtering the smoke flow still a sufficiently high proportion of one or more desired components of the smoke flow is present.

In a further preferred embodiment, the first filter segment, that is to say the filter segment comprising the component to be supplied, has one or more recesses. These recesses may serve to guide venilatory air and may be evenly distributed on the outer circumference of the first filter segment and may be located parallel to the longitudinal axis of the first filter segment extend. It is also conceivable that the recesses on the outer circumference of the first filter segment extend slightly helically. It is also conceivable that the second filter segment also has such recesses, that is, the recesses extend over both filter segments.

The recesses may be in the form of grooves on the outer circumference of the filter and preferably extend from the smoker facing the end of the filter or the filter outlet opening into the filter, in particular up to a region in the first filter segment.

More preferably, the first filter segment comprises a region or an element with a component to be delivered to the smoke stream. Thus, the first filter segment may be impregnated with the component to be dispensed or the component to be dispensed may be distributed over at least a portion of the first filter segment.

In a particularly preferred embodiment, the first filter segment comprises a stretched element arranged on the central longitudinal axis of the first filter segment and comprising the component to be dispensed. In particular, this may be a so-called Fiavourfaden that has been treated with a Flavoursubstanz. When passing or flowing through the first filter segment, the present in the Fiavourfaden substances are delivered to the smoke stream. In this case, the recesses fulfill, in particular at the periphery of the first filter segment, a further function, namely the concentration of the smoke flow towards the fi ve thread, so that the substances to be dispensed can be delivered as well as possible to the smoke flow.

In a further preferred embodiment, the sorbent in the second FHtersegment an adsorbent !, For example, activated carbon. In this case, the activated carbon may be distributed granularly or particulate over the entire second filter segment. Furthermore, it is conceivable that both the first and the second filter segment each comprise a filter base element and a base covering, while the filter base elements are produced from cellulose acetate tow and are each provided at their circumference with an envelope, for example a paper material. In particular, the envelopes may be bonded to the filter bases after the filter bases have been swept one after the other in accordance with a desired arrangement.

Furthermore, on the outer circumference of the Grundumhüliungen the first and the second filter segment, a further filter wrapper be arranged, in particular glued. Thus, it is possible that a dimensionally stable enclosure of the filter can be achieved by these Umhüilungen, wherein in the region of the filter segment with the recesses or grooves on the outer circumference a dimensionally stable enclosure is desired to a permanent Formstabiiität the recesses or grooves in the first Safe filter section.

Particularly advantageous for a dimensionally stable enclosure of the filter is a planar shift of the Grundumhüllungen with the Fiitergrundelementen, as well as a surface bonding of the filter wrap with the Grundumhüliungen. Thus, the Kiebeverbindung between the sheaths and the Fiitergrundelementen after curing forms a dimensionally stable envelope of the filter. It is advantageous if the bonds extend over a large area over the circumference of the filter segments. In a preferred case, the bonds extend over 80% to 95% of the circumferential area of the filter segments or the filter.

Furthermore, the mass of the amount of adhesive used to bond the filter base segments to the base and filter wraps can range from 5% to 15% of the total mass of the filter. As a result, a particularly dimensionally stable enclosure of the filter base segments is achieved, which ultimately leads to a very dimensionally stable filter. It is also conceivable that only in the region of the first filter segment or in the region of the recesses or grooves a high dimensional stability is formed, while the rest of the filter has a lower or comparable with conventional filters dimensional stability.

The invention further relates to a method for producing a filter for smoking articles. For this purpose, a first filter base element is provided with a component to be dispensed to the smoke stream. According to the invention, this takes place by incorporating a component comprising the component to be dispensed, for example a flavor thread on the filter base element. Subsequently, a base cladding can be applied or glued around the first filter base element, which extends over the peripheral surface of the filter base element, whereby a first filter segment is produced.

Further, the inventive method comprises at which a second filter base member having a Sorptionsmitte !, activated carbon is provided, in particular, so that at least one undesirable component is absorbed by this sorbent or, particularly adsorbed in the finished filter of the smoking article in the area of the second filter base element a further step _". Thus, the second filter segment may be provided with activated carbon particles, which are distributed, in particular distributed uniformly arranged in the second filter segment. This second filter segment, like the first filter segment, can then be glued circumferentially to a base wrap.

Subsequently, the first and second filter segments can be glued to a common filter envelope, in particular adhesively bonded over a large area, and thus combined to form a filter. By means of these many individual bonds, it is then possible, as already explained above, to achieve an extremely dimensionally stable covering of the filter. Likewise, a generous order of adhesive or glue for the dimensional stability of the filter wrapper is beneficial compared to conventional filter production.

In a later method step, the filter thus connected can be provided with recesses or grooves in the region of the mouth-side filter segment are, for example, evenly distributed on the circumference of the filter segment and extending parallel to a longitudinal axis of the filter. These grooves can be done, for example, by rolling the entire filter over a controllably heated plate under a controllable contact pressure, wherein the plate has projections in a desired geometry, which impress in the filter material. In the manufacture of such a mother filter, a plurality of filter segments can be placed one behind the other to form a so-called filter rod, which can ultimately be divided into a plurality of individual multr filters. Thus, it is possible that the entire filter rod is rolled over a controllably heated plate to form the recesses or grooves, wherein at certain intervals the recesses or grooves are formed on the filter rod, so that after dividing the filter rod into individual multifilter the grooves are formed at certain desired locations of each individual Multifüter. Furthermore, it is possible to produce different numbers of grooves on the circumference of the filter segment, which may have a certain geometry, as required. Both the length, depth and shape of the grooves can be tightened as desired, the selection of these parameters depending on the desired specifications of the smoking article. The gluing or gluing of the base wrapper and / or the filter wrapper can take place in terms of area, wherein a small area preferably remains free for gluing the seam of the filter wrapper paper with another glue. This so-treated filter can then cure for up to 90 hours, such that a higher filter hardness, especially as a result of higher triacetin coverage in the grooved filter segments, can range from 7% to 15% of the total mass of the filter in this filter segment compared to a standard fiber hardness is reached.

For the production of cigarettes, the filters are cut to length in a known manner and joined to the wrapped tobacco rod by a tipping paper. The tipping paper is ventilated in a known manner or can be ventilated in a known manner during cigarette production.

A preferred embodiment of the present invention is shown below with reference to the accompanying Figure 1. The invention can be used therein include features described individually and in any meaningful combination.

1 shows a filter according to the invention for a Rauchartikei, which is provided overall with the reference numeral 1. At the smoker facing the end of Rauchartikeis 1 a filter 8 is arranged, which in turn comprises the filter segments 2 and 3. The filter segment 2 adjoins the filter outlet opening 4, from which the smoke stream emitted to the smoker emerges from the smoking article 1. The filter segment 2 comprises a filter base segment 2a made of cellulose acetate tow and a base wrap 2b arranged on the circumference of the filter segment 2, which is glued to the filter base element 2a over almost the entire cylindrical peripheral surface of the first filter segment 2. Furthermore, evenly distributed on the circumference of the filter element 2 are three recesses 9 extending parallel to the central longitudinal axis of the smoking article 1, which recesses serve to guide the ventilation air and direct the smoke flow to the central axis of the filter segment 2. The ventilation air comes from the environment of the smoking article and can by ventilation openings schematically illustrated in Figure 1. The ventilation openings are located in this preferred embodiment on the circumference of the first filter segment, aSierdings can be arranged in a known manner at any position along the filter. The recesses 9 extend from the filter outlet opening 4 of the smoking article into a central region of the filter segment 2, so that three openings are formed on the Füteraustrittsöffnungsfiäche.

On the central longitudinal axis of the smoking article 1 extends from the filter outlet opening 4 to the interface between the first and second filter segment 2 and 3, a Flavourfaden 10 of cellulose acetate containing one or more to be delivered to the smoke flow substances or components to be dispensed and in particular with Flavoursubstanzen was treated. Advantageously, through the Ausnehmurigen 9 of the smoke flow to the center the first filter segment 2 or in the region of the Fiavourfadens 10 passed so that the smoke flow is optimally offset with the component to be dispensed.

Adjacent to the first filter segment 2, that is arranged between the first filter segment 2 and the smokable material or tobacco rod 7, there is the second filter segment 3, which also like the first filter segment 2 comprises a filter base 3a and a Grundumhüilung 3b, in the same way as is glued flat at the first filter segment.

To the first filter segment 2 and the second filter segment 3 arranged circumferentially and adhesively bonded to the base sheaths 2b and 3b, there is the filter sheath 8b, which summarizes the first filter segment 2 and the second filter segment 3 to a filter 8. It can be seen from FIG. 1 that a smoke stream coming from the tobacco rod 7 must necessarily flow through the feed inlet 5, at which the second filter segment 3 adjoins the tobacco rod 7, then the second filter segment 3 with the activated carbon particles 6 distributed therein and the first filter segment 2 passes with the flavor thread 10 to finally exit from the filter outlet opening 4 of the smoking article 1.

To produce the filter according to the invention shown in FIG. 1, the filter bases 2 a and 3 a are each provided with a base sheathing 2 b and 3 b, by gluing the base turns 2 b and 3 b respectively at the circumference of the corresponding filter base 2 a and 3 a. Before this step, the filter base 2a was provided with a flavor thread 10 extending on the central longitudinal axis of the filter base 2a and the filter base 3a was provided with activated carbon particles 6, which corresponds to known filter production technologies.

The resulting filter segments 2 and 3 are then placed axially against each other, wherein a plurality of the filter segments 2 and 3 in any order, so here alternately in axiai can be placed one behind the other, by gluing the Filter envelope 8b to be summarized to a Fiiter or a Fiiterstab. Following this, the individual filters or the filter rod are then rolled over a controllably heated plate in order to form recesses 9 on the circumference of the first filter segment 2. In the case of a filter rod this can then be divided into individual filters consisting of the filter segments 2 and 3. The final dimensional stability of the filter can be adjusted by regulating the adhesive application and the triacetin content.

The present invention is shown here with reference to a filter cigarette, wherein both the filter segments 2 and 3 and the tobacco rod 7 have a stretched cylindrical shape. However, it is also conceivable that the filter according to the invention can be used in conjunction with other smoking articles, such as pipes and therefore may have other than cylindrical shapes.

The following table shows the lower limit in the right column and the upper limit of preferred parameter values of an embodiment of the present invention in the left column.

Claims

claims

A filter for a smoking article (1), wherein the filter is a ventilated filter, comprising a first filter segment (2) and a second polyester segment (3), wherein the first polyester segment (2) comprises a component which penetrates through a filter outlet (4) passing smoke stream is discharged, and the second Fütersegment (3) comprises a sorbent (6) which receives a component from a through the filter inlet opening (5) passing smoke stream, and wherein at least one filter segment (2, 3) at least one recess (9) on the peripheral surface.

2. Filter according to claim 1, wherein the first Fütersegment (2) in a the smokable material (7) of Rauchartikeis (1) facing away from the Fiiters (8) is arranged and the second filter segment (3) in a smokable material (7 ) of the smoking article (1) facing the region of the filter (8) is arranged.

3. Filter according to one of claims 1 or 2, wherein the first filter segment (2) has at least one recess (9) which extends in particular parallel to the longitudinal axis of the first filter segment (2).

4. Filter according to the preceding claim, wherein the at least one recess (9) from the Füteraustrittsöffnung (4) extends to a region which is spaced from one of the filter outlet opening (4) opposite end face of the first filter segment (2).

5. Filter according to one of claims 1 to 4, wherein the first filter segment (2) has a region (10) or an element (10), which or which comprises the component to be dispensed.

6. Filter according to the preceding claim, wherein the region (10) or the element (10) has a stretched shape, in particular on the central longitudinal axis of the first filter segment (2) is arranged.

7. Filter according to any one of claims 1 to 6, wherein the Sorptionsmittei (6) is an absorbent or an adsorbent, in particular activated carbon.

A filter according to any one of claims 1 to 7, wherein the first and second filter segments (2, 3) each comprise a filter base (2a, 2b) and a base wrap (2b, 3b).

The filter of the preceding claim further comprising a filter wrap (8b) circumferentially disposed on the base envelopes (2b, 3b), wherein base wrappers (2b, 3b) and filter wrap (8b) individually or together form a durable wrapper.

10. Filter according to the preceding claim, wherein at least one of Grundumhüilungen (2b, 3b) and / or the Filterumhüliung (8b) in substantial portions of the peripheral side of a filter segment (2, 3) and the filter (8) with a Filtergrundeiement (2a , 3a) or with the filter segment (2, 3) are connected.

11. Filter according to the preceding claim, wherein the subregions over 80% to 95% of the Umfangsfiäche a filter segment (2, 3) and the filter (8) extend.

12. A filter according to any one of claims 10 or 11, wherein the compound is a cohesive, in particular a bond, wherein in particular the mass of the adhesive amount in the range of 5% to 15% of the mass of the filter (8).

13. A method of making a filter for smoking articles, comprising the steps of:

- Providing an endless strand of Fiftergrundelements (2a) with a to be delivered to a smoke stream component;

- applying a base wrap (2b) at the periphery of the endless strand of a filter base element (2a) to produce a first filter segment (2);

- Providing an endless strand of a second Fiitergrundelements (3a) with a sorbent (6), in particular activated carbon (6), which receives a component from a smoke stream;

- Applying a Grundumhüllung (3b) at the periphery of the endless strand of a second Fiitergrundelements (3a) for producing a second filter segment (3);

- Combining correspondingly cut to length elements of both filter segments (2, 3) to a filter rod with multiple length of the filter (8) by circumferentially bonding with a filter wrapper (8b);

- Providing the filter rod with multiple length of the filter (8) with recesses (9).

14. The method according to claim 13, wherein the first filter base element (2) and in particular also the second FHtergrundeSement (3) with a Grundumhüllung (2b, 3b) are adhesively bonded areally, in particular with a filter envelope (8b) are adhesively bonded areally.

15. The method according to any one of claims 13 or 14, wherein the sheath (2b, 3b, 8b) at least in the region of the first filter segment (2) dimensionally stable is formed, in particular by applying an amount of adhesive having a mass in the range of 7% to 15% of the mass of the Fiiters (8).

16. A filter according to any one of claims 13 to 15, wherein the filter (8) is rolled with a predetermined contact pressure over a projections exhibiting element to circumferentially in the region of the first filter segment (2) recesses (9) to produce.