SMOKING ARTICLE AND METHOD OF MANUFACTURING A SMOKING ARTICLE

Abstract

A smoking article and a method of manufacturing a smoking article are described. A smoking article is described in that the smoking article comprises tobacco material wrapped in a paper wrapper to form a tobacco roll, and in that the paper wrapper has a diffusivity between about 0.1 cm / s and 0.5 cm / s and a permeability of less than about 15 cu. A method of manufacturing the smoking article is described.

Description

SMOKING ARTICLE AND METHOD OF MANUFACTURING A SMOKING ARTICLE Technical field

[0001] The present invention relates to a smoking article and a method of manufacturing a smoking article. State of the art

[0002] Cigarettes and other combustible smoking articles produce smoke that is inhaled by a user. The tobacco is wrapped in a paper wrapper to form a tobacco stick, and a filter may be attached to the tobacco stick. Filters can be configured to modify the properties of the smoke produced by the smoking article, for example, by adding flavoring to the smoke produced by the smoking article. Summary

[0003] According to embodiments of a first aspect of the invention, a smoking article is provided comprising tobacco material wrapped in a paper wrapper to form a tobacco roll, wherein the paper wrapper has a diffusivity between about 0.1 cm / s and 0.5 cm / s and a permeability of less than about 15 CU.

[0004] The paper wrapping can have a diffusivity between about 0.1 cm / s and 0.3 cm / s. Petition 870260048866, dated 05 / 22 / 2026, p. 8 / 36 2 / 23

[0005] The paper wrapping can have a diffusivity between about 0.15 and about 0.25, between about 0.15 and about 0.20, or between about 0.17 and about 0.22 cm / s.

[0006] The paper wrapping may have a permeability of less than about 15 CU in at least 50% of the surface area of ​​the paper wrapping.

[0007] The paper wrapping can have a permeability between about 4 and about 12 CU.

[0008] The paper wrapping may have a permeability between about 4 and about 12 CU in at least 90% of the surface area of ​​the paper wrapping.

[0009] The paper wrapping may have a permeability of less than about 10 CU, or between about 3 and about 7 CU, over at least 90% of the surface area of ​​the paper wrapping.

[0010] The smoking article may include a filter.

[0011] A pressure drop across the filter can be between approximately 40 mm WG and 180 mm WG.

[0012] The filter may include a ventilation area.

[0013] The ventilation area can provide ventilation between 40% and 90%. Petition 870260048866, dated 05 / 22 / 2026, p. 9 / 36 3 / 23

[0014] The filter may comprise common filter material with a filament denier between 2.5 and 9.

[0015] The filter may comprise common filter material total denier between 10,000 and 32,000.

[0016] The paper wrapping can have a base weight of between 24 and 36 g / m².

[0017] The paper wrapping can have a base weight of between 27 and 32 g / m².

[0018] The paper wrapping can have a base weight of approximately 8g / m

[0019] The paper wrapping can have a base weight of approximately 32g / m

[0020] The paper wrapping may include less than 30% of the load by weight of the paper wrapping.

[0021] The paper wrapping may include between 15 and 25% of the load by weight.

[0022] The filler may comprise calcium carbonate.

[0023] The paper wrapping can have an opacity between 60% and 80% or between 68% and 80%.

[0024] The paper wrapping may contain less than 4% of burning additive by weight of the paper wrapping. Petition 870260048866, dated 05 / 22 / 2026, p. 10 / 36 4 / 23

[0025] The paper wrapping may contain approximately 1% of burning additive by weight.

[0026] The burn-in additive may be sodium citrate, potassium citrate, or a mixture of sodium citrate and potassium citrate.

[0027] According to embodiments of a second aspect of the invention, a method of manufacturing a smoking article is provided, the method comprising forming a tobacco bar by enclosing the tobacco material in a paper wrapping having a diffusivity between about 0.1 cm / s and 0.5 cm / s and a permeability of less than about 15 CU.

[0028] The method may also include attaching a filter to the said tobacco bar.

[0029] The method may also include providing a ventilation area to allow ventilation for the said filter.

[0030] The paper wrapping can have a diffusivity between about 0.1 cm / s and 0.3 cm / s.

[0031] The paper wrapping may have a permeability between about 4 and about 12 CU in at least 50% of the surface area of ​​the wrapping.

[0032] The paper wrapping may have a permeability between about 4 and about 12 CU in at least 90% of the surface area of ​​the wrapping. Petition 870260048866, dated 05 / 22 / 2026, p. 11 / 36 5 / 23 Brief description of the drawings

[0033] The embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0034] Figure 1 illustrates a smoking article according to an embodiment;

[0035] Figure 2 illustrates a smoking article according to another embodiment, containing a filter comprising a capsule;

[0036] Figure 3 illustrates a smoking article according to another embodiment, containing a filter comprising a tubular element; and the

[0037] Figure 4 illustrates a smoking article according to another embodiment, containing a filter comprising a tubular element and adsorbent material dispersed within the filter material. Detailed description

[0038] The term “smoking article”, as used herein, is intended to refer to combustible smoking articles and their components, such as cigarettes, cigarillos, cigars and hand-rolled cigarettes (whether made from tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, tobacco substitutes or other smokable material). Petition 870260048866, dated 05 / 22 / 2026, p. 12 / 36 6 / 23

[0039] The filters described in this document may be supplied to users as an integral component of a smoking item or as a separate, discrete component of a smoking item. When supplied separately, the filter units and smoking items may be packaged separately or together as a parts kit.

[0040] Smoking articles, such as cigarettes and their shapes, are often named according to the length of the cigarette: regular (typically in the range of 68 to 75 mm, for example, from about 68 mm to about 72 mm), short or mini (68 mm or less), king-size (typically in the range of 75 - 91 mm, for example, from about 79 mm to about 88 mm), long or super king-size (typically in the range of 91 - 105 mm, for example, from about 94 mm to about 101 mm) and ultra-long (typically in the range of about 110 mm to about 121 mm).

[0041] They are also named according to the circumference of the cigarette: regular (about 23 - 25 mm), wide (greater than 25 mm), thin (about 22 - 23 mm), semi-thin (about 19 - 22 mm), super-thin (about 16 - 19 mm) and micro-thin (less than about 16 mm). Consequently, a cigarette in a super-thin king-size format will, for example, have a length of about 83 mm and a circumference of about 17 mm. Cigarettes in the normal king-size format have a circumference of 23 to 25 mm and a total length of 75 to 91 mm.

[0042] Each format can be produced with filters of different lengths, smaller filters generally being used in formats with smaller lengths and circumferences. Petition 870260048866, dated 05 / 22 / 2026, p. 13 / 36 7 / 23 Typically, the filter length will be around 15 mm, associated with short and regular formats, to 30 mm, associated with ultra-thin super-long formats. The filter paper will be longer than the filter, for example 3 to 10 mm longer, so that the filter paper covers the filter and overlaps the tobacco bar to connect the filter to the tobacco bar.

[0043] Smoking articles and filters described in this document may be made in, but are not limited to, any of the formats above.

[0044] The filter material forming the filters described herein may comprise cellulose acetate fiber tow. The filter material may also be formed using other materials used to form fibers, such as polyvinyl alcohol (PVOH), polylactic acid (PLA), polycaprolactone (PCL), poly(1,4-butanediol succinate) (PBS), poly(butylene adipate-co-terephthalate) (PBAT), starch-based materials, paper, cotton, aliphatic polyester materials and polysaccharide polymers or a combination thereof. The filter material may be plasticized with a plasticizer suitable for the filter material, such as triacetin, wherein the filter material is a cellulose acetate tow, or it may not be plasticized.The tow used to produce the filter unit or other filter component may use any suitable specification, such as fibers containing an 'I' shape or other cross-section, filament denier values ​​between 2.5 and 15 denier per filament, for example, between 3.0 and 9.0 denier per filament. Petition 870260048866, dated 05 / 22 / 2026, page 14 / 36 8 / 23 and total denier values ​​from 10,000 to 50,000, for example, between 15,000 and 45,000.

[0045] As used in this document, the terms flavor and flavoring refer to materials that, where local regulations permit, may be used to create a desired flavor or aroma in a product for adult consumers. They may include extracts (e.g., licorice, hydrangea, white-barked Japanese magnolia leaf, chamomile, fenugreek, clove, menthol, Japanese mint, anise, cinnamon, herb, wintergreen, cherry, berry, peach, apple, Drambuie, bourbon, Scotch whisky, whisky, spearmint, peppermint, lavender, cardamom, celery, cascarilla, nutmeg, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, cassia, cumin, cognac, jasmine, ylang-ylang, sage, fennel, chili pepper, ginger, anise, coriander, coffee, or a mint oil of any species of the genus Mentha), aroma enhancers, bitterness receptor site blockers, sensory receptor site activators or stimulators,Sugars and / or sugar substitutes (e.g., sucralose, acesulfame potassium, aspartame, saccharin, cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol) and other substances or additives, such as charcoal, chlorophyll, minerals, botanicals, or breath fresheners. They may be imitation, synthetic, or natural ingredients or mixtures thereof. They may be in any suitable form, for example, oil, liquid, or powder.

[0046] In the figures described here, similar reference numbers are used to illustrate equivalent resources, articles, or components. Petition 870260048866, dated 05 / 22 / 2026, page 15 / 36 9 / 23

[0047] Figure 1 is a cross-sectional side view of a smoking article 1. The smoking article 1, in this example a cigarette, has a mouth end 1a, arranged to be placed in the user's mouth when smoking, and a lit end 1b, arranged to be lit when smoking. The tobacco material 2 is wrapped in a paper wrapper 3 to form a tobacco stick.

[0048] In some examples, the smoking article does not include a filter. In other examples, a filter 4 is connected to the tobacco stick by a filter paper 5. The filter 4 is wrapped in a buffer wrapper 6. A vent area 7 may be provided to allow outside air to enter the filter 4 during use. The vent area may be provided as a series of perforations that pass through the filter paper 5 and the buffer wrapper 6 and into the filter 4.

[0049] The paper wrapping 3 has a diffusivity between about 0.1 cm / s and 0.5 cm / s. In some examples, the paper wrapping 3 has a diffusivity between about 0.1 cm / s and about 0.3 cm / s.

[0050] In some examples, paper wrapper 3 has a diffusivity of less than about 0.30 cm / s. In some examples, paper wrapper 3 has a diffusivity of less than 0.25 cm / s. In some examples, paper wrapper 3 has a diffusivity between 0.15 and 0.2 cm / s. Advantageously, such diffusivity levels have been found to be particularly effective in delivering smoking items, such as cigarettes, with a more consistent distribution per puff and a greater number of Petition 870260048866, dated 05 / 22 / 2026, p. 16 / 36 10 / 23 puffs. It was also found that such smoking articles pass the industry's known low ignition propensity tests, while exhibiting acceptable rates of free-air self-extinction. Free-air self-extinction is the property of a smoking article to self-extinguish when kept outdoors (i.e., rather than being placed on a substrate), which is undesirable from the consumer's point of view. In some examples, the paper wrapper has diffusivity between 0.10 and 0.3 cm / s, between 0.15 and 0.25 cm / s, between 0.15 and 0.20 cm / s, or between 0.17 and 0.22 cm / s.

[0051] The paper wrapping 3 has low permeability, in this example a permeability of less than about 15 Coresta units (CU). For example, the paper wrapping may have a permeability of less than about 15 CU in at least 50% of the surface area of ​​the paper wrapping or in at least 75% or 90% of the surface area.

[0052] In some examples, the paper wrapping 3 has a permeability between about , for example, the paper wrapping about 4 and about 12 CU to and about 12 CU. In some it has a permeability between along at least 90% of the surface area.

[0053] In some examples, the paper wrapping 3 has a permeability of less than 10 Coresta units (CU), or between about 3 and about 7 CU, in each case, at least 50%, or more preferably 75% or 90% of the surface area of ​​the paper wrapping. Petition 870260048866, dated 05 / 22 / 2026, p. 17 / 36 11 / 23

[0054] In the use of the smoking articles described in this document, the paper wrapper 3 containing the low diffusivity and low permeability bands, as described, reduces the amount of oxygen drawn into the tobacco stick when the smoking article is smoked, compared to smoking articles containing paper wrappers with higher levels of diffusivity and permeability. The reduction in the amount of oxygen drawn into the tobacco stick causes the tobacco 2 to burn at a slower rate between puffs and therefore has the effect of increasing the burning time of the tobacco stick, providing a longer smoking experience.

[0055] In some examples, the entire paper wrapping 3 has the low diffusivity and low permeability bands defined here.

[0056] In some examples, the diffusivity of the paper wrapper 3 may be uniform along the length of the tobacco stick when the paper wrapper 3 is wrapped around the tobacco stick. Additionally or alternatively, the diffusivity of the paper wrapper 3 may be uniform around the entire circumference of the tobacco stick. The paper wrapper 3 may include some areas containing higher or lower diffusivity. In some examples, at least 50% of the paper wrapper is provided with low diffusivity, for example, below 0.3 cm / s. In some examples, more than 75% or 80% or about 100% of the wrapper is provided with low diffusivity, for example, below 0.3 cm / s or below 0.25 cm / s. Alternatively or additionally, at least 50% of the paper wrapper may be provided with low permeability, for example, below Petition 870260048866, dated 05 / 22 / 2026, p. 18 / 36 12 / 23 CU. In some examples, more than 80%, 90%, or approximately 100% of the wrapping is provided with low permeability as described, for example below 15 CU. The paper wrapping may have one or more discrete regions with low permeability and low diffusivity. In some examples, the entire paper wrapping is provided with uniform low diffusivity and low permeability within the ranges described herein. Providing the entire paper wrapping with low diffusivity and low permeability reduces the variability in the free-air self-extinguishing property of the smoking article during smoking compared to providing two or more discrete areas of the smoking article with low diffusivity and low permeability.

[0057] Filter 4 may have a substantially cylindrical shape. Filter 4 may be between 6 mm and 30 mm long, for example, between 7 mm and 20 mm. In one example, filter 4 is 18 mm long.

[0058] The tobacco bar may also have a substantially cylindrical shape, with an outer diameter substantially equal to the outer diameter of the filter 4 if a filter is provided. The tobacco bar comprises a substantially cylindrical core of packaged tobacco material 2 wrapped in paper wrapping 3. The tobacco material 2 may comprise a mixture of chopped tobacco and may also include reconstituted tobacco material. The paper wrapping 3 extends around the circumference of the tobacco bar and extends along its length to form a wrapped tobacco bar. The end faces of the tobacco bar are Petition 870260048866, dated 05 / 22 / 2026, page 19 / 36 13 / 23 left open to allow a gas flow to pass axially through the bar.

[0059] In some embodiments, the tobacco bar includes tobacco with a net weight based on the size and type of smoking item. For example, the tobacco weight may be a standard weight corresponding to a conventional smoking item of the same size. In some embodiments, the tobacco weight may be reduced compared to a conventional smoking item of the same size. The tobacco weight may be selected based on the desired characteristic of the smoking item. A lower tobacco weight may be associated with a reduction in discoloration of the paper wrapper. Additionally, a lower tobacco weight may be associated with a reduction in CO and tar levels. However, a lower tobacco weight may also be associated with a reduction in the number of puffs. Consequently, the tobacco weight may be chosen according to the characteristic of the smoking item to be achieved.

[0060] In some examples, the smoking article may be a smoking article with a length of 90 mm and a circumference of 21 mm. The net weight of the tobacco may be, for example, 510 mg. In other examples, the smoking article may have a reduced tobacco weight of 480 mg. The smoking article with the reduced tobacco weight of 480 mg may include lower levels of CO and tar and exhibit lower levels of stains on the paper wrapper. However, the number of puffs from the smoking article with the reduced tobacco weight of 480 mg may be lower when smoked by a Petition 870260048866, dated 05 / 22 / 2026, p. 20 / 36 14 / 23 user compared to a comparable smoking article with a net weight of 480 mg of tobacco.

[0061] In other examples, a smoking article with a length of about 90 mm and a circumference of about 21 mm may contain a tobacco weight of 490 mg. Alternatively, the smoking article may contain a reduced tobacco weight of about 460 mg.

[0062] In other examples, a smoking article with a length of about 90 mm and a circumference of about 23 mm may contain a tobacco weight of about 630 mg.

[0063] Alternatively, the smoking article may contain a reduced tobacco weight of approximately 560 mg.

[0064] It will be evident to the expert that the weight of the tobacco can be selected based on these characteristics of the resulting smoking article, for example, selecting a lower weight of tobacco in order to reduce staining and CO and tar levels, or selecting a higher weight of tobacco to increase the number of puffs that can be obtained from the smoke.

[0065] During use, when the smoking article 1 is smoked by a user, air is drawn through the lit tobacco bar to provide smoke to the user. In embodiments that include a filter, the smoke is also drawn through the filter to remove some particulate matter from the smoke before being provided to the user. In embodiments that include a vented filter, during use air is drawn through the area of Petition 870260048866, dated 05 / 22 / 2026, page 21 / 36 15 / 23 ventilation 7 of filter 4, in order to dilute the smoke supplied to the user through filter 4.

[0066] In some examples, the ventilation area 7 comprises perforations in the filter tip paper 5 and buffer wrap 6. In some examples, the ventilation area 7 comprises embossed regions in the filter paper of the filter 5 and / or buffer wrap 6. At least one of the filter papers 5 and buffer wrap 6 may alternatively be provided as a porous material, for example, containing a porosity greater than 200 Coresta units, allowing air to enter the filter 4. The filter 4 may be vented by ventilation channels formed using laser or electrostatic perforation techniques. The ventilation area 7 may be provided in any part of the filter 4, for example, a part at least 12 mm from the mouth end 1a of the smoking article. In examples with multiple filter sections or segments, the ventilation area may, for example, be provided in a filter section or segment adjacent to the tobacco bar.

[0067] In some examples, the pressure drop across filter 4 is between 40 mm WG and 180 mm WG. The filter pressure drop can be selected depending on the desired product characteristics. In some examples, the pressure drop across the filter is between 70 mm WG and 180 mm WG. In some examples, the pressure drop across the filter is between 130 mm WG and 180 mm WG. In some examples, the pressure drop across the filter is between 140 mm WG and 180 mm WG. In some examples, the pressure drop across the filter is between 70 mm WG and 100 mm WG. In some examples, the pressure drop across the filter is between 85 mm WG and 100 mm WG. Petition 870260048866, dated 05 / 22 / 2026, page 22 / 36 16 / 23

[0068] In some examples, the filter is not provided with a vent area. In other examples, the filter is provided with a vent area. The vent area 7 of filter 4 can provide between 40% and 90% ventilation when the smoking article is smoked in use. The vent area can, for example, provide between 55% and 90% ventilation. In some examples, the vent area provides between 55% and 85% ventilation. In some examples, the vent area provides between 60% and 75% ventilation. In some examples, the vent area provides between 65% and 75% ventilation.

[0069] By altering the ventilation levels and pressure drop in the filter, the levels of CO and tar delivered to the user can be changed. A higher ventilation level through the filter results in reduced tar and CO levels when using cigarette paper with low diffusivity and low permeability, as described herein. A higher ventilation level also increases the number of puffs during smoking. However, a lower ventilation level through the filter reduces the likelihood of the smoking article self-extinguishing outdoors during smoking. Therefore, the ventilation level can be selected according to these properties of the smoking article.

[0070] In some examples, the paper wrapping around the tobacco stick has a base weight of between 24 and 36 g / m2. The weight of the paper is one of the factors that can influence the diffusivity of the paper. An increase in weight per square meter of paper increases the diffusivity of the paper. Therefore, in order to provide low diffusivity for the wrapping, the paper weight is selected to be between 24 and 36 g / m2. In some examples, the paper in Petition 870260048866, dated 05 / 22 / 2026, page 23 / 36 17 / 23 around the tobacco stick has a weight between 27 and 32 g / m2. In some examples, the paper around the tobacco stick has a weight of about 28 g / m2. In some examples, the paper wrapping the tobacco stick has a weight of about 32 g / m2. Higher weight per square meter of the paper wrapper 3 can also provide greater opacity of the paper wrapper. Increasing the base weight of the paper along with increasing the diffusivity of the paper reduces the level of discoloration of the cigarette paper during smoking.

[0071] In some instances, the paper may comprise a filler. In some instances, the filler content of the paper wrapper 3 is less than 30% by weight of the paper. In some instances, the filler content of the paper wrapper is between 15 and 25% by weight. A lower filler content decreases the diffusion capacity of the paper wrapper and therefore may also lead to increased LIP (low ignition propensity) passage rates. Furthermore, the use of a lower filler content may increase the number of puffs that can be obtained when the smoking article is smoked in use. The filler content of the paper wrapper may be greater than 15%. In some instances, the filler content of the paper wrapper may be between 21 and 22% by weight. In some instances, the filler is calcium carbonate. However, it will be recognized that any other suitable filler may be used.It will be recognized that the amount of charge used can be selected by the specialist in order to achieve the desired characteristics, such as, but not limited to, diffusivity, number of puffs, opacity, smoke yield and LIP passage rate.

[0072] The opacity of the paper can be affected by the particle size of the filler used. For example, particle sizes Petition 870260048866, dated 05 / 22 / 2026, page 24 / 36 Smaller 18 / 23 particles can result in greater opacity. In some examples, the particle size can be between 0.3 μm and 2 μm. Opacity can also be affected by the filler structure. For example, when calcium carbonate is used as a filler, it may comprise, but is not limited to, calcite crystal, precipitated calcium carbonate, or ground calcium carbonate.

[0073] In some instances, the paper wrapper comprises a burning additive. In some instances, the paper wrapper comprises less than 4% burning additive by weight. The burning additive decreases the likelihood of the smoking article self-extinguishing in the open air, i.e., for example, when the user holds the smoking article between puffs. However, increasing the level of burning additive may decrease the LIP pass rate of the smoking article. In some instances, the paper wrapper comprises 1% burning additive by weight. In some instances, the burning additive is tripotassium citrate. In some instances, the burning additive is trisodium citrate. In some instances, the burning additive comprises trisodium citrate and trisodium citrate. However, it will be recognized that any suitable burning additive may be used.The amount of combustion additive can be selected by the specialist in order to achieve the desired characteristics, such as, but not limited to, smoke yield and LIP approval rate.

[0074] In some examples, the filter comprises filter material with a denier per filament between about 2.5 and about 9, for example, between about 3 and about 8. Petition 870260048866, dated 05 / 22 / 2026, page 25 / 36 19 / 23

[0075] In some examples, the filter comprises filter material with a total denier between about 10,000 and about 32,000, for example, between about 12,000 and about 30,000.

[0076] Figure 2 illustrates a smoking article 1' according to another embodiment, the smoking article 1' being the same as the smoking article 1 of Figure 1, except that it has a filter 4 comprising a capsule 8. In the present example, the filter 4 is formed of filter material, in this case cellulose acetate tow treated with a plasticizer, in this case triacetin. The capsule 8 is spherical and has a diameter of 3.5 mm, although other capsule shapes and sizes may be used, for example, a capsule with a diameter of about 3 mm, or between 0.5 mm and 6 mm, or between 2 mm and 5 mm. The capsule 8 is incorporated within and surrounded on all sides by the filter material of the filter 4. The capsule 8 contains a fluid additive that modifies the properties of the main smoke stream passing through the smoking article 11. The capsule 8 can be manufactured and inserted into the filter 4 using existing processes and machines.In the present example, capsule 8 contains menthol flavoring, although other fluids or granular additives may be contained within capsule 8. The capsule can be broken by a consumer squeezing the filter to release the fluid additive onto the filter material of filter 4. Filter 4 in Figure 2 can be between 7 mm and 30 mm in length, for example, between 7 and 20 mm. In one example, filter 4 is 18 mm long.

[0077] Figure 3 illustrates a smoking article 1'' according to another embodiment, the smoking article 1'' being the Petition 870260048866, dated 05 / 22 / 2026, page 26 / 36 20 / 23 same as smoking article 1 of Figure 1, except that it has a filter section 4a similar to filter 4 of Figure 1 connected coaxially to a tubular element 4b. The tubular element 4b is formed of fibrous filter material in the present example. The fibrous filter material is, in the present example, a continuous tow of cellulose acetate plasticized with triacetin. A channel extends lengthwise through the center of the tubular element 4b. The channel extending through the center of the filter element 4b may have a diameter of 1 mm to 6 mm, for example, 2 mm to 5 mm. The tubular element 4b may be an unwrapped element or may be wrapped in a buffer wrap (not shown). The filter section 4a may also be unwrapped or wrapped in a buffer wrap (not shown), and a combination buffer wrap 10 may be used to connect the tubular element 4b and the filter section 4a.The filter section 4a can be between 6 mm and 30 mm long, for example, between 6 mm and 20 mm. In one example, the filter section 4a is 12 mm or 18 mm long. The hollow tubular element 4b can be between 6 mm and 15 mm long, for example, between 6 mm and 12 mm, or in one example, 7 mm long.

[0078] Figure 4 illustrates a smoking article 1''' according to another embodiment, the smoking article 1''' being the same as the smoking article 1'' of Figure 3, except that it has a filter segment 4c including an adsorbent material 9 dispersed within the filter material upstream of the filter section 4a. A combination of buffer wrap 10 can be used to connect the tubular element 4b, the filter section 4a and the filter segment 4c. The adsorbent material 9 is, in the present example, provided in the form of activated carbon particles, although other Petition 870260048866, dated 05 / 22 / 2026, page 27 / 36 21 / 23 forms of adsorbent can be used, such as ion exchange resins. The filter section 4c can be between 6 mm and 20 mm long, for example, between 6 mm and 18 mm, or in one example 12 mm long.

[0079] In a method of manufacturing a smoking article, for example, a smoking article as described herein, in a first step a tobacco stick is formed by enclosing the tobacco material in a paper wrapper having a diffusivity between about 0.1 cm / s and 0.5 cm / s and a permeability of less than about 15 CU. In a second step, a filter may be attached to the tobacco stick. In a third step, a vent area may be provided to allow ventilation in the filter.

[0080] In some examples of the method, the paper wrapping has a diffusivity between about 0.1 cm / s and 0.3 cm / s. In some examples, the paper wrapping has a permeability between about 4 and about 12 CU in at least 50% of the surface area of ​​the wrapping. In some examples, the paper wrapping has a permeability between about 4 and about 12 CU in at least 90% of the surface area of ​​the wrapping.

[0081] Examples of smoking articles according to the realizations are described below. Unless otherwise specified, the smoking articles test was carried out in accordance with ISO 3308:2000, in which a 35 ml puff lasting 2s is taken every 60s. Petition 870260048866, dated 05 / 22 / 2026, p. 28 / 36 22 / 23 Example 1

[0082] An exemplary cigarette was produced containing the filter arrangement as illustrated in Figure 4 and a circumference of approximately 23.4 mm. The net weight of the tobacco in the tobacco stick was 560 mg / cigarette. The base weight of the paper wrapper was 28 g / m2. The level of burning additive was 1%. The total length of the filter was 34 mm, connected to a tobacco stick with a length of 56 mm, giving a total cigarette length of 90 mm. The venting of the tip was planned at approximately 68%. The pressure drop in the filter was approximately 100 mm WG. The number of puffs obtained using these parameters was approximately 9.5, providing approximately 5 mg of tar. Example 2

[0083] An exemplary cigarette was produced containing the filter arrangement illustrated in Figure 4 and a circumference of approximately 23.4 mm. The net weight of the tobacco in the tobacco stick was 630 mg / cigarette. The base weight of the paper wrapper was 28 g / m2. The level of burning additive was 1%. The total length of the filter was 27 mm, connected to a tobacco stick with a length of 63 mm, giving a total cigarette length of 90 mm. The tip venting was planned at approximately 67%. The pressure drop in the filter was approximately 90 mm WG. The number of puffs obtained using these parameters was approximately 11, providing approximately 7 mg of tar. Petition 870260048866, dated 05 / 22 / 2026, pp. 29 / 36 23 / 23 Example 3

[0084] An exemplary cigarette was produced containing the filter arrangement as illustrated in Figure 4 and a circumference of approximately 21 mm. The base weight of the paper wrapper was 28 g / m2. The level of combustion additive was 1%. The total length of the filter was 27 mm, connected to a tobacco stick with a length of 63 mm, giving a total cigarette length of mm. The venting of the tip was planned at approximately 72%. The pressure drop in the filter was approximately 177 mm WG. The number of puffs obtained using these parameters was approximately 10.3, providing approximately 6.1 mg of tar.

Claims

CLAIMS 1. Smoking article (1, 1', 1'', 1''') characterized in that it comprises: tobacco material (2) wrapped in a paper wrapper (3) to form a tobacco stick; and wherein the paper wrapper (3) has a diffusivity between 0.1 cm / s and 0.5 cm / s and a permeability between 4 CU and 12 CU in at least 50% of the surface area of ​​the paper wrapper (3); wherein the diffusivity of the paper wrapper (3) is uniform throughout the smoking article (1, 1', 1'', 1''').

2. Smoking article (1, 1', 1'', 1'''), according to claim 1, characterized in that the paper wrapping (3) has a diffusivity between 0.1 cm / s and 0.3 cm / s.

3. Smoking article (1, 1', 1'', 1''), according to any one of claims 1 or 2, characterized in that the paper wrapping (3) has a diffusivity between 0.15 and 0.25, between 0.15 and 0.20, or between 0.17 and 0.22 cm / s.

4. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 3, characterized in that the paper wrapping (3) has a permeability between 4 and 12 CU in at least 90% of the surface area of ​​the paper wrapping (3).

5. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 4, characterized in that it further comprises a filter (4).

6. Smoking article (1, 1', 1'', 1'''), according to claim 5, characterized in that a pressure drop across the filter (4) is between 40 mm WG and 180 mm WG. Petition 870260048866, dated 22 / 05 / 2026, p. 31 / 36 2 / 4 7. Smoking article (1, 1', 1'', 1'''), according to any one of claims 5 or 6, characterized in that the filter (4) comprises a ventilation area (7).

8. Smoking article (1, 1', 1'', 1'''), according to claim 7, characterized in that the ventilation area (7) provides ventilation between 40% and 90%.

9. Smoking article (1, 1', 1'', 1'''), according to any one of claims 5 to 8, characterized in that the filter (4) comprises filter material having a denier per filament between 2.5 and 9.

10. Smoking article (1, 1', 1'', 1'''), according to any one of claims 5 to 9, characterized in that the filter (4) comprises filter material having a total denier between 10,000 and 32,000.

11. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 10, characterized in that the paper wrapping (3) has a base weight between 24 and 36 g / m2.

12. Smoking article (1, 1', 1'', 1'''), according to claim 11, characterized in that the paper wrapping (3) has a base weight between 27 and 32 g / m2.

13. Smoking article (1, 1', 1'', 1'''), according to claim 12, characterized in that the paper wrapping (3) has a base weight of 28 g / m2.

14. Smoking article (1, 1', 1'', 1'''), according to claim 12, characterized in that the paper wrapping (3) has a base weight of 32 g / m2. Petition 870260048866, dated 22 / 05 / 2026, p. 32 / 36 3 / 4 15. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 14, characterized in that the paper wrapping (3) comprises less than 30% of the weight load of the paper wrapping (3).

16. Smoking article (1, 1', 1'', 1'''), according to claim 15, characterized in that the paper wrapping (3) includes between 15 and 25% of the paper wrapping (3) by weight.

17. Smoking article (1, 1', 1'', 1'''), according to any one of claims 15 or 16, characterized in that the filling comprises calcium carbonate.

18. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 17, characterized in that the paper wrapping (3) has an opacity between 60% and 80%, or between 68% and 80%.

19. Smoking article (1, 1', 1'', 1'''), according to any one of claims 1 to 18, characterized in that the paper wrapping (3) comprises less than 4% of burning additive by weight of the paper wrapping (3).

20. Smoking article (1, 1', 1'', 1'''), according to claim 19, characterized in that the paper wrapping (3) comprises 1% of burning additive by weight.

21. Smoking article (1, 1', 1'', 1'''), according to any one of claims 19 or 20, characterized in that the burning additive is sodium citrate, potassium citrate or a mixture of sodium citrate and potassium citrate. Petition 870260048866, dated 22 / 05 / 2026, p. 33 / 36 4 / 4 22. Method of manufacturing a smoking article (1, 1', 1'', 1''') as defined in any one of claims 1 to 21, the method characterized in that it comprises: forming a tobacco bar by wrapping the tobacco material (2) in a paper wrapper (3) having a diffusivity between 0.1 cm / s and 0.5 cm / s and a permeability between 4 CU and 12 CU in at least 50% of the surface area of ​​the paper wrapper (3); wherein the diffusivity of the paper wrapper (3) is uniform throughout the smoking article (1, 1', 1'', 1''').

23. Method of manufacturing a smoking article (1, 1', 1'', 1'''), according to claim 22, characterized in that it further comprises a filter (4) for said tobacco bar.

24. Method of manufacturing a smoking article (1, 1', 1'', 1'''), according to claim 23, characterized in that it further comprises providing a ventilation area (7) to allow ventilation in said filter (4).

25. Method of manufacturing a smoking article (1, 1', 1'', 1'''), according to any one of claims 22 to 24, characterized in that the paper wrapping (3) has a diffusivity between 0.1 cm / s and 0.3 cm / s.

26. Method of manufacturing a smoking article (1, 1', 1'', 1'''), according to any one of claims 22 to 25, characterized in that the paper wrapping (3) has a permeability between 4 and 12 CU over at least 90% of the surface area of ​​the wrapping (3).

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