KR20130139266A - Tobacco smoke filter - Google Patents

Abstract

A longitudinally extending core of tobacco smoke filtration material comprising a longitudinally spaced additive from the first end of the core; A first wrapper around the core; And a second wrapper around the first wrapper; The first wrapper, together with at least the second wrapper (and for example between itself), has at least one channel (eg, 5 to 23 channels) extending longitudinally of the filter from at least one end of the filter. Define, tobacco smoke filter or filter element.

Description

Tobacco Smoke Filter {TOBACCO SMOKE FILTER}

The present invention relates to filters and filter elements for smoking articles such as cigarettes.

Cigarette filters containing particulate additives, especially activated carbon, are well known in the tobacco industry. The absolute majority of such filters comprise a plurality of longitudinally adjacent segments, wherein the mouth end segments contain no particulate additive and thus provide an acceptable end appearance, while one or more upstream Segments contain or contain particulate additives. These multi-segment filters are called "single section" filters (which are two or more segments) because the various segments have to be manufactured by a separate process and then precisely aligned and the different segments need to be adjacent to form a multi-segment filter rod. It is known to be more complex and costly to manufacture than one (separate) section of filtration material rather than filtration material, where a single section filter is a one-pass process, for example by a single machine. during the process).

Applicants have previously developed a 'monocarbon' filter, ie a single section filter incorporating carbon that has at least one end free from particulate additive and can be produced during a one-pass process. These are 'Active Patch' (British Patent No.2261152) and 'Smooth Core' (International Patent Publication No. 2006/059134) filters. They each feature particulate additives in a pod located on or in the middle of a portion of the inner side of the wrapper.

Applicants have also developed a 'CPF' filter (see, eg, British Patent No. 2132326). They feature an inner wrap that has an embossed groove on a portion of the length of the inner wrap and has the advantage of providing improved filtration efficiency and / or lower pressure drop compared to standard cellulose acetate filters. In addition, they can provide a unique end appearance. Such a filter may be used as a single section filter or as a segment in a multi-segment filter. British Patent 22261152 has shown that the features of a CPF filter can be combined with the features of an active patch filter to produce a single section CPF filter containing, for example, carbon. Such a filter may be referred to as the term 'APF / CPF'. However, a disadvantage of these filters is that their carbon carry-over ('CCO') levels tend to be higher, i.e., during production, desorbed carbon granules can be accidentally delivered to the groove area of the inner wrap, This can cause them to contaminate the appearance of the filter. The leaving granules are difficult to remove during filter manufacture.

According to the present invention, a longitudinally extending (eg, single) of tobacco smoke filtration material comprising longitudinally spaced additives (eg, particulate additives) from the first (downstream) end of the core Section) core; A first wrapper (eg of breathable material) around the core; And a second wrapper around the first wrapper; The first wrapper, together with at least the second wrapper (for example between itself), defines at least one channel extending longitudinally of the filter from at least one end of the filter (eg, a single section). Provides a tobacco smoke filter or filter element. Preferably, the first wrapper defines at least one channel extending longitudinally from the first (downstream) end of the filter (at least in conjunction with the second wrapper). Preferably, the first wrapper, together with at least the second wrapper (and for example between itself), has at least five channels extending longitudinally of the filter (eg between 5 and 23) from at least one end of the filter. Channels, for example 9 to 20 channels). The filter or filter element of about 24-25 mm circumference may comprise 14 to 20 channels, for example. The filter or filter element of about 16-17 mm circumference may comprise 9 to 14 channels, for example.

The particulate additive is spaced longitudinally (distance) from the first (downstream) end of the core, so that it is not visible from the first (downstream or labial) end of the core. In one embodiment, the longitudinally extending core of tobacco smoke filtration material includes one (or at least one) pocket of additive (eg, particulate additive) fully enclosed (eg, embedded) therein. And a rod-shaped core (eg, a single section) of tobacco smoke filtration material. The rod-shaped core of tobacco smoke filtration material may optionally have additional wrappers (eg, porous or nonporous) engaged around the rod-shaped core. Providing the additive pocket fully enclosed in the core of tobacco smoke filtration material has the effect of the additive spacing longitudinally (distance) from the first (downstream) end of the core (the additive pocket and the first end of the core). Between the cigarette smoke filtration material).

In one aspect according to the invention, a longitudinally extending (e. G., Tobacco smoke filtration material comprising longitudinally spaced additives (e.g. particulate additives) from the first (downstream) end of the core For example, a single section) core; A first wrapper (eg of breathable material) around the core; And a second wrapper around the first wrapper; The first wrapper, together with at least the second wrapper (for example between itself), defines at least one channel extending longitudinally of the filter from at least one end of the filter; Wherein the longitudinally extending core of tobacco smoke filtration material has tobacco smoke filtration with one (or at least one) pocket of an additive (eg, particulate additive) fully enclosed (eg embedded) therein. Provided (eg, a single section) tobacco smoke filter or filter element comprising a rod-shaped core of material. Preferably, the first wrapper, together with at least the second wrapper (and for example between itself), has at least five channels extending longitudinally of the filter (eg between 5 and 23) from at least one end of the filter. Channels, for example 9 to 20 channels). The filter or filter element of about 24-25 mm circumference may comprise 14 to 20 channels, for example. The filter or filter element of about 16-17 mm circumference may comprise 9 to 14 channels, for example.

Preferably, the first wrapper is a breathable material. In other words, preferably, the first wrapper is a breathable wrapper. The first wrapper can be, for example, a breathable filter paper (eg, corrugated breathable filter paper) or a wrapper of cellulose acetate (eg, corrugated breathable cellulose acetate).

Preferably, the first wrapper is corrugated, thereby providing (defining) a channel extending longitudinally of the filter from at least one end of the filter with at least the second wrapper (and between, for example, itself). The first wrapper may be a waveform, the waveform being five or more channels extending longitudinally of the filter (eg, 5 to 23 channels) from at least one end of the filter (eg, with the second wrapper), For example, 9-20 channels are provided (defined). The filter or filter element of about 24-25 mm circumference may comprise, for example, 14 to 20 channels (provided by the waveform). The filter or filter element of about 16-17 mm circumference may comprise, for example, 9 to 14 channels (provided by the waveform). As used herein, the term "corrugated" or "corrugated" includes meanings shaped as folds that include parallel and alternating ridges and grooves.

Preferably, the waveform in the first wrapper is an embossed groove (eg, formed by embossing the material of the first wrapper). For example, the first wrapper may be a sheet having a profiled (eg, embossed, corrugated) surface and a profile facing the second wrapper (ie, facing outward radially). The sheet is wrapped around the core so that the ringed surface forms a channel with the second wrapper. It will be appreciated that the corrugated first wrapper is wrapped around the core such that the corrugations (and channels) are oriented longitudinally (eg, substantially longitudinally) along the axial direction of the core. Each channel may be provided by the waveform of the first wrapper and is preferably closed or blocked at an end far from the end of the filter from which the channel extends. In general, the core surface corresponds to a surface radially facing (profiled) inwardly of the first wrapper (ie, the surface of the first wrapper facing the core). In another embodiment, the core surface does not conform to the radially facing (profiled) surface of the first wrapper, in which embodiment the first wrapper, along with the second wrapper, extends longitudinally with the core. Can be defined. In another embodiment, the first wrapper is profiled only on one surface and the sheet is wrapped around the core such that the profiled surface faces the second wrapper (ie, outwardly radially) to form a channel with the second wrapper. The wrapped core surface conforms to the unprofiled corrugated inner surface of the first wrapper and the channel remains only between the first wrapper and the second wrapper.

Thus, the present invention relates to "pods" or fully enclosed particulate additive pockets (eg as described in WO 2006/059134) centrally located axially, and (with a second wrapper Together) to form a single section filter with a corrugated inner wrap embossed into a groove on a portion of its length, forming a channel. In this way, manufacturing costs and complexity associated with particle-bearing multi-segment filters and the CCO shortcomings of APF / CPF single section filters can be avoided. In addition, this allows for excellent flexibility in filter design. By controlling parameters such as the size and position of the central pod (pocket) and the length and position of the grooved portion of the first (inner) wrapper, it is possible to vary the filtration performance, taste experience, and end appearance. In a way, it is possible to pass smoke through the filter. For example, when using a central pod of activated carbon granules, if the channel ("wrinkled area") occupies the longitudinal area of the filter similar to the pod, smoke can be directed away from the pod, thus giving smokers a 'carbon taste'. Produces less. Conversely, if the channel (wrinkled area) occupies a longitudinal area of filter different from the pod, smoke may preferentially be directed through the pod, thus giving the smoker a 'carbon taste' (if the pod contains carbon) or other taste. (If the pods contain other flavoring agents). In addition, the filter allows for higher tar retention (at the same pressure drop) or lower pressure drop (at the same tar stagnation) than conventional 'smooth core' filters.

The longitudinally extending core (eg, longitudinally extending single section core) of the tobacco smoke filtration material is close to the second end (eg, upstream tobacco end in the filter cigarette) and the first end (eg, For example, an additive that is completely enclosed (eg, embedded) away from the downstream or buccal or cleft end, or away from the second end (but spaced longitudinally therefrom) and away from the second end. It may have a single pocket of (eg, particulate additive). The longitudinally extending core of tobacco smoke filtration material is entirely internally located equidistantly between the second end (eg, tobacco end) of the core and the first end (eg, labial end) of the core. It may have a single pocket of encapsulated (eg embedded) additive (eg particulate additive). A single longitudinally extending core of tobacco smoke filtration material may comprise one or more (eg, two, three, four) separate pockets of additives (eg, particulate additives) completely enclosed therein. Can have The fully enclosed (eg embedded) additive pocket (s) may be inclined toward one or both ends (eg, generally in an elliptical configuration). If one or more pockets of additives are present, they can have a longitudinal constant spacing. Other pocket arrangements are possible (e.g., relatively close longitudinal gaps alternating with longer intervals) and it is possible to achieve this by appropriate adjustment of the manufacturing process. Of tobacco smoke filtration material comprising a rod-shaped core of tobacco smoke filtration material having one (or at least one) pocket of an additive (eg, particulate additive) fully enclosed (eg embedded) therein. Longitudinally extending cores can be produced, for example, by the methods and apparatus disclosed in WO 2006/059134.

The filtration material can be, for example, any of the materials (typically filamentous, fibrous, web or extruded) conventionally employed in the manufacture of tobacco smoke filters. The filtration material can be, for example, synthetic or natural filamentous tow of plastic or cotton, such as polyethylene or polypropylene, or cellulose acetate filamentous tow. This can be, for example, natural or synthetic short fibers, cotton wool, web materials such as paper (usually crepe paper) and synthetic nonwovens, and extruded materials (eg starch, synthetic foam).

The additive may be a particulate additive. The particulate additive may be any particulate additive suitable for use in tobacco smoke filters (eg, activated carbon, zeolites, ion exchange resins (eg, weakly basic anion exchange resins), sepiolite, silica gel, alumina, powder). Itself, carbonaceous polymer resin, and diatomaceous earth). The particulate additive may be a mixture of two or more materials. The additives may include smoke modifiers (eg flavorants). It may be any smoke modifying agent (eg flavoring agent) suitable or known for use in smoking articles such as cigarettes, for example flavoring agents such as menthol, spearmint, cloves, and the like. The flavoring agent may be any flavoring agent known for use in tobacco smoke filters or filter elements. For example, the flavoring agent may be menthol, spearmint, peppermint, nutmeg, cinnamon, cloves, lemon, chocolate, peach, strawberry, vanilla, and the like. Preferred smoke modifier (flavor) is menthol. For example, the additive may be sepiolite granules to which menthol flavoring is applied. If the longitudinally extending core of tobacco smoke filtration comprises fully enclosed (eg embedded) additive pocket (s) embedded therein, the additive may be a particulate additive such as activated carbon (see above) It is enclosed in the filtration material, for example, as a separate pocket or pod of particulate additive particles substantially separated from the filtration material and completely enclosed therein. In another embodiment, the fully enclosed (eg, embedded) additive pocket (s) may be a breakable capsule or capsules, or one or a plurality of breakable microcapsules. The capsule (s) or microcapsule (s) may be a variety of media (eg, smoke modifiers such as flavoring agents (such as the flavorings disclosed above), and / or liquids, solids, or other materials to assist, for example, smoke filtration. ) May be contained. The use of capsules or microcapsules is well known in the art.

The weight of the additive (eg, particulate additive of about 0.5 g / cm ³ density) fully enclosed in the longitudinally extending core of the tobacco smoke filtration material is, for example, for a 20-30 mm long filter, for example 10 to 65 mg, for example 20 to 50 mg, for example 25 to 40 mg per filter. In the case of a 20-30 mm long filter, the weight of the first additive can be, for example, 40 to 65 mg per filter (eg when high loading is required). In the case of a 20 to 30 mm long filter, the weight of the first additive can be, for example, 10 to 40 mg per filter (eg when lower loading is required).

The filter or filter element may comprise at least one channel extending longitudinally of the filter from the first (downstream) end of the filter and at least one channel extending longitudinally of the filter from the second (upstream) Each channel extends only to a portion of the core length.

The channel (or one or more channels) may extend longitudinally from the first (downstream) end of the filter to the second (upstream) end of the filter. However, at least one portion of the filter or filter element does not include a channel extending longitudinally along its length (i.e., the channel (s) is formed from the first (downstream) end of the filter, Preferably does not extend longitudinally upstream) to the end).

The filter or filter element may comprise up to 23 channels, preferably 14 to 20 channels, extending longitudinally from one (or both) ends of the filter or filter element (filters / circuits of about 25 mm circumference) For elements). The filter or filter element may comprise at least five channels extending longitudinally from one (or both) ends of the filter or filter element, for example 5 to 23 channels, preferably 14 to 20 channels (eg 9 to 14 channels or 14 to 20 channels). The total cross-sectional area of these channels may amount to 2-12%, preferably at least 4%, more preferably 4-8% of the total cross-sectional area of the filter or filter element. Thus, careful control over the number and / or depth of channels (eg, by controlled embossing of the first wrapper) can provide improved filtration performance. By increasing the depth of the waveform in the first wrapper, preferably by increasing the surface area of the waveform available to the smoke, and optionally with an increase in the waveform pitch (i.e. extension of the waveform with a decrease in the number of waveforms) This can be achieved. For example, a filter according to the present invention may have 15 channels about 0.45 mm deep at a pitch of about 1.5 mm at one or both ends of the filter; The other filter may have channels 0.32 mm deep with a pitch of 1.05 mm, with the number of channels 23 (at either end or at either end). In these embodiments the area of the corrugated wrap that can be used for smoke filtration is generally slightly less than the total corrugated surface area because the ridges of the corrugation are generally in contact with the outer wrapper and are not effective for the filter. The filter or filter element of about 24-25 mm circumference may comprise 14 to 20 channels, for example. The filter or filter element of about 16-17 mm circumference may comprise 9 to 14 channels, for example.

The tobacco smoke filter may be 15 to 40 mm in length, for example 17 to 35 mm, for example 20 to 30 mm. The circumference of the tobacco smoke filter may be 14 to 28 mm, for example 16 to 26 mm, for example 16 to 17 mm, or 24 to 25 mm.

Preferably, the length of each channel is at least 2 mm, preferably 2.5 mm to 23 mm, more preferably 3 mm to 15 mm, more preferably 3.5 mm to 9 mm. The channel or channels extending from one end (upstream or downstream) may be of different length or the same length as those extending from the other end (if present). The length of the channel may be 7 to 8 mm. The length of the channel can be 3 to 4 mm, for example 3.75 mm. In one embodiment, the channel extends only from one end (upstream or downstream) and is 7-8 mm long. In another embodiment, the channel extends from both upstream and downstream ends and is 3-4 mm in length (at each end).

There may be variations, for example when the channels approach the closed end, but preferably the depth of the channels will be substantially uniform over their longitudinal scale.

The completed filter of the present invention may have a second wrapper that is breathable around the first (eg, corrugated) wrapper, which may be essentially permeable material and / or perforated. This permeable outer wrapper may be a tipping overwrap that incorporates the filter into the filter cigarette, which is only applied to the cigarette manufacturing step. In this case, the filter rod is initially manufactured with the first wrapper exposed, and the present invention includes such a rod (see below) with a finished filter to which the outer wrapper is attached. Thus, in a further aspect according to the present invention there is provided a longitudinally extending tobacco smoke filtration material comprising longitudinally spaced additives (eg, particulate additives) from the first (downstream) end of the core. core; And a first wrapper (eg of breathable material) around the core; The first wrapper is corrugated and the waveform defines at least one channel extending longitudinally of the filter from one end of the filter (on its radial outer face); Wherein the longitudinally extending core of tobacco smoke filtration material has tobacco smoke filtration with one (or at least one) pocket of an additive (eg, particulate additive) fully enclosed (eg embedded) therein. A tobacco smoke filter or filter element (eg, a single section) is provided that includes a rod-shaped core of material.

It is also possible to use filters with a second, non-breathable wrapper, for example pasting packaging.

The portion (or each portion) of the filter comprising a longitudinal channel (e.g., the portion of the first wrapper that has been corrugated, e. May be referred to. A portion or portion (or portion or portion of each) of the filter that does not include a longitudinal channel (on the filter cross section) (eg, the first wrapper is planar (eg, unembossed / not waved) Portions or respective portions) are referred to herein as rods or rod portions. In one embodiment the filter according to the invention comprises a 3 mm pleated portion at each end and a single central rod portion as the remaining full length of the filter. This configuration has the additional advantage of reducing the amount of filtration material (eg cellulose acetate tow) in the core because the pressure drop (PD / mm) of the rod is higher than the pressure drop of the pleats. This configuration can also provide a more desirable end appearance.

In a further embodiment of the present invention, the tobacco smoke filter extends in the longitudinal direction of the filter and extends only at a portion of the core length and does not extend from an upstream or downstream end of the filter (eg, the first And defined by the wrapper and the second wrapper. In this embodiment of the invention, the tobacco smoke comprises one or more longitudinal channels (pleated portions) on one or both of the upstream and downstream ends of the filter and further longitudinal channels or channels (additional) within the filter. Wrinkled portion). In this embodiment, there is one or more portions or sections (one or more rod portions) of the filter without longitudinal channels. The filter may have additional pleated regions and / or rod regions.

In the filter cigarette according to the invention, the filter of the invention (or the filter comprising the filter element of the invention) is connected to the wrapped tobacco rod with one (second, upstream) end of the filter facing towards the cigarette. For example, by ring paste [which only engages around the adjacent ends of the (wrapped) filter and rods so that a large portion of the filter wrap remains exposed), or more preferably, the entire paste wrapper (which is a tobacco) By engaging the adjacent end of the rod and around the entire filter length), the filter can be connected to the wrapped tobacco rod.

By methods well known in the art, for example, pre-perforated or breathable wrapper (s) (plugwrap), and / or laser perforation of wrapper (s) (plugwrap) and paste overpacking By using, it is possible to ventilate or not vent any filter or filter cigarette according to the invention. Likewise, the ventilated full paste envelope may be inherently breathable or provided with vents, and in ventilated products where both filter plug wrap and paste envelope are present, ventilation through the envelope is typically vented through the plug wrap. Will match. Vents through the filter plug wrap, through the paste overpack, or both at the same time can be made by laser drilling during filter or filter cigarette manufacture.

When the ventilation in the filter or filter cigarette according to the invention is localized in the longitudinal direction of the product, preferably, depending on the ventilation and filtration performance required, this localization is carried out upstream, downstream of the additive pocket and with the additive pocket, Or for one or two zones selected from an additive pocket. Ventilation upstream and / or mating the first additive pocket is often desirable. If two or more are present, there may be ventilation between the second additive portion (or pocket or patch).

In accordance with the present invention further aspects include a plurality of (eg, two, four, six, etc.) filters (eg, two, four, six, etc.) connected in an end-to-end integral fashion in a mirror image relationship as described above and / or herein. Or filter elements).

Hereinafter, the present invention will be described with reference to the following examples and the accompanying drawings.

Degree 1 schematically illustrates a filter in accordance with an embodiment of the invention.
Degree 2 diagrammatically illustrates a filter according to a second embodiment of the invention.
3 diagrammatically illustrates a filter according to a further embodiment of the invention.

1, 2 and 3 show an embodiment of a 'smooth core' CPF filter.

1 shows a rod-shaped core of cellulose acetate filtration material having a "pod" or pocket 3 fully enclosed (eg embedded) in an additive in the form of activated carbon particles 4 in the core and central portion of the filter. A single section tobacco smoke filter 1 of 27 mm length and 24.5 mm circumference comprising a longitudinally extending core 2 of tobacco smoke filtration material in the form is shown. The core (pod filter element) 2 can be formed, for example, by the method disclosed in WO 2006/059134. The first wrapper 5 of breathable filter paper (or corrugated cellulose acetate) surrounds immediately next to the core 2, which is an uncorrugated circumferential portion 6 (in the central portion or section of the filter 1) ( That is, a section of the wrapper surrounding a portion of the core 2 that includes embedded pockets or pods, but not the longitudinal direction (i.e., the wave or groove runs in the axial direction of the filter) throughout its length. Waveform). The core surface corresponds to the waveform in the first wrapper 5. The non-corrugated second wrapper 10 of the breathable paper surrounds right next to the first wrapper 5 and forms (defines) channels 9a and 9b with a waveform in the first wrapper 5. The core and wrappers 5 and 10 extend over the entire length of the filter 1. The inclusion of an uncorrugated circumferential portion 6 of the wrapper 5 in the central portion of the filter means that there is no channel in this portion and channels 9a and 9b do not extend to the full length of the filter. Thus, the filter 1 is a set of 15 channels 9a of length 7.5 mm formed at the first end or downstream end 11 of the filter (the corrugated portion of the first wrapper 5 and the waveform of the breathable paper). Formed between the second unwrapped wrapper 10) and a second set of 15 channels 9b of length 7.5 mm at the second end or upstream end 13 of the filter at the second end (first wrapper ( Formed between the waveform in 5) and the unwrapped second wrapper 10), which form a pleated portion or pleat at each end 11, 13 of the filter 1. At the center of the filter, an uncorrugated region of the wrapper 5 in the circumferential portion 6 forms an uncorrugated or non-corrugated rod portion (rod) of 12 mm in length at the center of the filter. This bar portion blocks the end of each channel opposite the end of the filter where each channel began to extend. The rod portion of this filter does not include a channel extending longitudinally on the cross section of the filter 1 along the entire length of the rod portion. Forming a first wrapper that is corrugated (eg, by embossing), applying a first wrapper that is corrugated around the core, and applying a second wrapper are known methods (eg, in the United Kingdom). And those described in patent 22133269. It will be appreciated that the process of applying the first wrapper proceeds and mates with the process of forming and placing the pod in the central section of the filter core.

For example, the filter 1 can be attached to a cigarette by ring-paste or full paste overpacking, which methods are well known in the art. It will be appreciated that other materials well known in the art can be used to form the cores 2, and the wrappers 5, 10.

Thus, the filter includes channels 9a, 9b (ie, 'wrinkling') embossed (waveformed) at both ends to provide a unique appearance at both ends of the filter, and the unembossed central portion 6 (Ie 'rods'). The pockets of activated carbon granules are located in the body of the filter and approximately in the area defined by the rods. During use with the filter attached to the cigarette (not shown) at the end 13, a portion of the smoke passes directly into the core 2 and passes through the end 11 of the filter 1, forming a filament It is filtered by contact with and contact with activated carbon in the pocket. With dilution air drawn through the permeable wrapper 10, the smoke also enters the uncorrugated portion (bar) 6 through the channel 9b, and then the diluted smoke is corrugated wrapper 5. After passing through), it enters the core 2 and passes out of the filter at the end 11, so that the smoke is filtered by both the wrapper 5 and the core 2. It will be appreciated that the filter according to the invention can also be used with a non-ventilated wrapper, in which case there will be no dilution air drawn into the filter through the wrapper.

Thus, the embodiment of FIG. 1 is a 'pod' or a fully enclosed pocket of particulate additive located centrally in the axial direction (eg, as described in WO 2006/059134), and of length. It is a single section filter with an inner wrap embossed into a groove (channel) on some. The filter avoids both the complexity and manufacturing costs associated with particle-bearing multi-segment filters (because it is a single section filter) and avoids the CCO disadvantage of APF / CPF single section filters (activated carbon is not a wrapper phase) Because it is located in a pod or pocket). 1 embodiment can also vary filtration performance, taste experience, and end appearance by controlling parameters such as the size and position of the central pod (pocket) and the length and position of the grooved portion of the inner wrap. Explain that it is possible to pass smoke through a filter in a way. As discussed above, smoke preferentially passes through the carbon pod because the pleated region occupies the longitudinal region of the filter different from the pod, thus creating more 'carbon taste' for the smoker. In addition, this filter allows for higher tar stagnation (at the same pressure drop) or lower pressure drop (at the same tar stagnation) than conventional 'smooth core' filters. It will be appreciated that the corrugated area may provide a different arrangement that occupies the longitudinal area of the filter similar to the pod, thereby producing less 'carbon taste' to the smoker by passing smoke away from the pod (eg, FIG. 3). Reference).

2 shows a further embodiment that provides a unique labial end appearance by having a single pleated area facing the labial end 31 (right side of the diagram) of the filter. 2 shows cellulose with “pods” or pockets 23 fully enclosed (eg embedded) in an additive in the form of activated carbon particles 24 located towards the second or upstream end 33 of the filter. A single section tobacco smoke filter 21 of 27 mm length and 24.5 mm circumference is shown, comprising a longitudinally extending core 22 of tobacco smoke filtration material in the form of a rod-shaped core of acetate filtration material. The first wrapper 25 of the breathable filter paper surrounds immediately next to the core 22, which is an uncorrugated circumferential portion 26 (ie, embedded pockets or toward the second or upstream end 33 of the filter). With the exception of the section of the wrapper surrounding the portion of the core 2 comprising the pod, which is corrugated longitudinally throughout its length. As in the FIG. 1 embodiment, the core surface in the embodiment of FIG. 2 corresponds to the waveform in the first wrapper 25. The non-corrugated second wrapper 30 of the breathable paper surrounds immediately next to the first wrapper 25 and forms (defines) the channel 29a with the waveform in the first wrapper 25. The core and wrappers 25 and 30 extend over the entire length of the filter 1. Including an uncorrugated circumferential portion 26 of the wrapper 25 in the upstream portion of the filter means that there is no channel in this portion and channel 29a does not extend to the full length of the filter. The filter 21 is thus formed at the first end or downstream end 31 of the filter, which is formed between the corrugated portion of the first wrapper 25 and the uncorrugated second wrapper 30 of the breathable paper. It has a set of channels 29a (e.g., 15 channels 29a) of length 15 mm. These channels (waveforms) form a pleated portion or pleat at the downstream or spherical end 31 of the filter 1, thus providing a unique end appearance at this end and accompanying the rod area at the other end. The pocket of activated carbon granules is located towards the tobacco end of the filter, approximately below the rod area.

FIG. 3 shows a further embodiment that has a single pleated area facing the tobacco end 53 (left side of the diagram) of the filter to provide a conventional labial end appearance. The carbon pod is also located approximately coincident with the pleated area, towards the tobacco end of the filter. 3 shows cellulose with “pods” or pockets 43 fully enclosed (eg embedded) in an additive in the form of activated carbon particles 44 positioned towards the second or upstream end 53 of the filter. A 27 mm long and 24.5 mm circumferential tobacco smoke filter 41 comprising a longitudinally extending core 42 of tobacco smoke filtration material in the form of a rod-shaped core of acetate filtration material. The first wrapper 45 of the breathable filter paper encloses immediately next to the core 42, which defines an uncorrugated circumferential portion 46 (ie, embedded pocket or pod) towards the first or downstream end of the filter. And a section of the wrapper that does not enclose a portion of the containing core 42) and is corrugated longitudinally throughout its length. The core surface corresponds to the waveform in the first wrapper 45. The non-corrugated second wrapper 50 of the breathable paper surrounds immediately next to the first wrapper 45 and forms (defines) a channel 49b with a waveform in the first wrapper 45. The core and wrappers 45 and 50 extend over the entire length of the filter 41. The inclusion of the uncorrugated circumferential portion 46 of the wrapper 45 in the downstream portion of the filter means that there is no channel in this portion and channel 49b does not extend to the full length of the filter. The filter 21 is thus the length formed at the second or upstream end 51 of the filter, formed between the corrugated portion of the first wrapper 45 and the second, uncorrugated wrapper 50 of the breathable paper. It has a set of channels 49b of 10 mm (e.g., 15 channels 49b). These channels (waveforms) form a pleated portion or pleat at the upstream end 51 of the filter 41, with a rod area at the other (order) end.

Claims (16)

A longitudinally extending core of tobacco smoke filtration material comprising a longitudinally spaced additive from the first end of the core; A first wrapper around the core; And a second wrapper around the first wrapper; The first wrapper, together with at least a second wrapper (and for example between itself), defines at least one channel extending longitudinally of the filter from at least one end of the filter. The method of claim 1,
A filter or filter element, wherein the longitudinally extending core of tobacco smoke filtration material comprises a rod-shaped core of tobacco smoke filtration material having at least one additive pocket fully enclosed therein. A longitudinally extending core of tobacco smoke filtration material comprising a longitudinally spaced additive from the first end of the core; A first wrapper around the core; And a second wrapper around the first wrapper; The first wrapper, together with at least the second wrapper, defines at least one channel extending from one end of the filter in the longitudinal direction of the filter; Wherein the longitudinally extending core of tobacco smoke filtration material comprises a rod-shaped core of tobacco smoke filtration material having at least one pocket of additives fully enclosed therein. 4. The method according to any one of claims 1 to 3,
A filter or filter element that is a single section filter or filter element. 5. The method according to any one of claims 1 to 4,
A filter or filter element wherein the first wrapper is a breathable material. The method according to any one of claims 1 to 5,
The first wrapper is corrugated and the waveform defines five or more (eg, 9-20) channels extending longitudinally of the filter from at least one end of the filter. 7. The method according to any one of claims 1 to 6,
The filtration material may comprise one or more natural or synthetic filamentous tows, such as cotton or plastic, such as polyethylene or polypropylene, cellulose acetate filamentous tow, natural or synthetic staple fibers, cotton wool ( cotton wool), a web material such as paper (eg crepe paper), a synthetic nonwoven material, or an extruded material (eg starch, synthetic foam). 8. The method according to any one of claims 1 to 7,
A filter or filter element wherein the additive is a particulate additive. 9. The method of claim 8,
The particulate additive is activated carbon, zeolite, ion exchange resin (e.g. weakly basic anion exchange resin), sepiolite, silica gel, alumina, molecular sieve, carbonaceous polymer resin, diatomaceous earth, or a mixture of two or more of these additives. , Filter or filter element. 8. The method according to any one of claims 1 to 7,
The filter or filter element, wherein the additive in the fully enclosed additive pocket (s) is a frangible capsule or capsules, or one or a plurality of breakable microcapsules. 11. The method according to any one of claims 1 to 10,
Filter or filter element containing flavoring agent. A longitudinally extending core of tobacco smoke filtration material comprising a longitudinally spaced additive from the first end of the core; And a first wrapper around the core; The first wrapper is waveformd into a waveform defining at least one channel extending from one end of the filter in the longitudinal direction of the filter; Wherein the longitudinally extending core of tobacco smoke filtration material comprises a rod-shaped core of tobacco smoke filtration material having at least one pocket of additives fully enclosed therein. The method of claim 12,
A tobacco smoke filter or filter element, wherein the first wrapper is waveformd into waveforms defining at least five (eg, 9 to 20) channels extending from one end of the filter in the longitudinal direction of the filter. Tobacco smoke filter substantially as previously described herein with reference to any one of the accompanying drawings. A filter cigarette comprising the filter according to claim 1, connected to a wrapped tobacco rod with the second end of the core towards the tobacco. A plurality of (eg, two, four, six, etc.) filters (or filter elements) according to any one of claims 1 to 14, connected end-to-end integrally in a mirror image relationship. Multiple bars.

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