MX2013010876A

MX2013010876A - Smoking article.

Info

Publication number: MX2013010876A
Application number: MX2013010876A
Authority: MX
Inventors: Richard Fiebelkorn
Original assignee: British American Tobacco Co
Priority date: 2011-03-22
Filing date: 2012-03-06
Publication date: 2013-10-17
Also published as: CN103501644A; AU2012230553B2; EP2688430A1; JP5918348B2; EP2688430B1; CA2829718A1; AR085529A1; CA2829718C; CL2013002677A1; TW201302109A; UA110516C2; RU2589437C2; WO2012126721A1; AU2012230553A1; BR112013024191A2; KR20140020293A; MY164045A; CN103501644B; JP2014511675A; US20140020698A1

Abstract

A smoking article comprising a filter section comprising a first region of filtration material for removing particulate matter from a smoke stream, wherein the rod the smoking article is arranged to enhance heat transfer towards the first region of filtration material is disclosed.

Description

AR TICLE FOR SMOKING Countryside The invention relates to articles for smoking and, in particular, to the modification of smoke in smoking articles.

Background Smoking articles comprising smoke modifying agents are known in the art. Examples include absorbers or adsorbents located in the filter section or tobacco rod of the smoking article. The particulate filters absorb smoke components that resided in the particulate phase of a smoke stream. Adsorbents are frequently included and are known to adsorb the constituents of travel smoke in the vapor phase of the smoke stream.

While such absorbers and adsorbents have removed the constituents of the smoke from the smoke stream as it passes through the smoking article, the arrangement of the smoking article has not allowed the temperature profile of the fumes to be controlled. This In this way, the smoke components are not removed when they are desired to be removed.

Short description One embodiment of the present invention provides a smoking article comprising a filter section comprising a region of filtration material for removal of particulate matter from a smoke stream, wherein the smoking article is positioned to improve the transfer of heat to the first region of the filtration material.

In one embodiment, a rod of smokable material wrapped in a wrapper and positioned to form a carbon at one end thereof when illuminated is provided, wherein the wrap has heat conduction strips attached thereto to improve heat transfer from the bundle. the carbon to the first region of filtration material.

The smokable material rod may have at least one channel extending therethrough to improve heat transfer from the coal to the first region of filter material.

At least one channel may comprise a plurality of channels positioned radially around the circumference of the bar of smokable material.

In one embodiment, the smoke stream is cooled downstream of the first region of the filtration material, for example, by means of a cooling chamber. A region of adsorbent material may be provided in or downstream of the cooling chamber.

The perforations for cooling the smoke can be included in a wrap circumscribing the filter section.

A diluent can be provided, for example, downstream of the first region of filtration material.

The bar of smokable material may comprise a granular composite material of tobacco and may comprise, in addition to carbon.

A second region of filtration material can be provided downstream of the first region of filtration material, wherein the second region of filtration material has a filtration efficiency lower than the filtration efficiency of the first region of filtration material. .

The first region of filtration material can have a retention value greater than (30) percent or even greater than (70) percent.

The article for smoking can be configured from such that the first region of filtration material only removes matter with boiling points or greater than a predetermined level, for example around 250 ° C (300 ° C, 350 ° C, 400 ° C, 450 ° C or 500 ° C.

Brief Description of the Drawings For the present invention to be more fully understood various embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a side cross-sectional view of a smoking article according to an embodiment of the present invention; Figure 2 is a side cross-sectional view of a smoking article according to an alternative embodiment of the present invention; Figure 3 is a side cross-sectional view of a smoking article according to an alternative embodiment of the present invention; Figure 4 is a side cross-sectional view of a smoking article according to an alternative embodiment of the present invention; Figure 5 is a side cross-sectional view of a smoking article according to another embodiment of the present invention; Y Figure 6 is a side cross-sectional view of a smoking article according to another embodiment of the present invention; Figure 7 is an end view of a smoking article according to an embodiment of the present invention; Fig. 8 is a plan view of a tobacco rod wrapper according to an embodiment of the present invention; Y Figure 9 is an end view of a smoking article according to another embodiment of the present invention.

Detailed description Figure 1 shows a cylindrical cigar (10) according to an embodiment of the present invention. The cigar (10) comprises a tobacco rod (15) and a filter section (20). The tobacco rod (15) and the filter section (20) shown in Figure 1 are joined together by nozzle paper (25), although other means for joining the tobacco rods to filter the sections that are known in the art. technique can be employed in the alternative. The filter section (20) is wrapped in a length of tipping paper (25) which is longer than the filter section (20) and is connected to the filter section (20). tobacco bar (15) to the filter section (20) in a manner well known in the art.

The tobacco rod (15) shown in Figure 1 may be shorter than conventional tobacco bars that are well known in the art. The tobacco rod (15) can be formed from reconstituted or granulated tobacco circumscribed by a wrapper (26). The wrapper (26) can be formed from any type of paper suitable for the packaging of tobacco bars that are known in the art. The envelope (26) may have a natural permeability between 0 and 25 Coresta units (hereinafter referred to as CU), but preferably between 2 and 10 CU. Greater permeability can be achieved using the electrostatic orifice.

The tobacco rod can be 10 to (50) millimeters (hereinafter referred to as mm) in length, although (30) to (40) mm is a preferred length. The tobacco bar (15) can be between 14 and 28 mm in circumference, although 17 to 25 mm is a preferred circumference.

A binder can be added to the tobacco during the manufacture of the tobacco rod (15) to make the tobacco easier to handle and form into sticks. The carbon, in granular form, for example activated carbon or any other carbon additive known in the art, it can also be added to the tobacco which, just as the manufacture of the tobacco rod (15) is easier to handle, facilitating combustion and increasing the heat of combustion, is also known to act as an adsorbent of certain components of the smoke.

The wrapper (26) circumscribing the tobacco rod (15) is made of low permeability paper although other paper wrapping materials that are known in the art can be used. The permeability or porosity of an object is known to affect the rate of combustion. As such, the low permeability of the wrapper (26) ensures that the tobacco rod (15) burns more slowly than a tobacco rod wrapped in a higher permeability wrapper. When the tobacco rod (15) is shorter than the conventional tobacco bars that are known in the art, the decrease in the combustion rate increases the number of inhalations or puffs that a user can take from the cigar (10) during the use.

The filter section (20) of the cigar (10) may be wrapped in a filter envelope (27) in addition to the nozzle paper (25). The filter envelope (27) can have a permeability between 0 and 2000 Coresta units.lul The filter section (20) comprises a region of high EF filtration efficiency (hereinafter EF) of material (30). The high material region of EF (30) is located at the upstream end of the filter section (20) and is adjacent to the tobacco rod (15). The high EF material (30) can be heat resistant, since it will be exposed to high temperatures and can be a Cambridge filter pad formed from fiberglass. The high EF material (30) may also contain materials, such as zeolites, which can selectively remove the individual smoke constituents. The region of high EF material can be between 1 and 15 mm in length. The filtration efficiency and / or retention value of the high EF material must be selected to achieve a high level of particle filtration. The retention value according to embodiments of the invention is greater than 30% and preferably greater than (70)% of the particulate matter, although the invention is also effective with retention values greater than (40)%, (50) %, (60)%, (80)% and / or (90)%.

Since the region of the high EF material (30) is likely to be heated during the use of an insulating layer 31 it can be provided between the high EF material (30) and the nozzle paper (25) to reduce the risk of a user is burned when he comes into contact with the filter section (20).

A diluent support material (35) or aerosol forming agent may be located within the region of the high EF material (30). The diluent holding material (35) can contain glycerol although other diluents known in the art can also be used. The diluent holding material (35) provides another means for modifying the smoke content by introducing other components into the interior and thereby diluting the smoke aerosol.

The diluent support material (35) can alternatively be located within a cooling chamber (40) downstream of the region of the high EF material (30). Additional regions of diluent may be located further downstream of the filter section (20). The cooling chamber (40) shown in Figure 1 provides a space for the smoke to circulate and cool as it travels downstream. The cooling chamber (40) can be between 10 and 30 mm in length.

Downstream of the cooling chamber (40) is a region of low EF material (45). The low EF material (45) can be formed from celse acetate yarns, although other low EF filtration materials can be used which are known in the art. The low EF material (45) can be formed in a filter It absorbs the smoke components that pass through. The region of low EF material (45) can be between (10) and (30) mm in length.

Located in the region of low EF material (45) there may be adsorbent material (50) which adsorbs the components of the smoke. Examples of suitable adsorbent materials include activated carbon granules, carbon chips or any other material known in the art to adsorb the smoke constituents.

A mouth end filter section (55) is located at the mouth end (60) of the smoking article (10). The end filter section of the mouth can be between 5 and 15 mm in length. The mouth end filter section (55) can be formed from a filtration material filter under EF without adsorbent material placed therein. The mouth end filter section (55) prevents the adsorbent material (50) from coming into contact with the mouth of the users. Although not shown in Figure 1, flavorings can be included in the mouth end filter section (55). This can have the effect of counteracting any change in taste that can be caused by the adsorbent material (50).

The nozzle paper (25) is provided with a space 65 along its length, which allows air to penetrate the filter section (20) and some constituents of the smoke to permeate out of the filter section (20). ).

An alternative embodiment of the cigar (10) is shown in Figure 2. The filter section (20) is substantially the same as the filter section (20) shown in Figure 1. A hole (70) extends throughout of the longitudinal axis of the tobacco rod (15). The hole (70) provides a conduit for the smoke to travel downstream from a glowing coal (75) to the region of the high filtration material EF (30). The hole (70) can have a diameter between 1 and 3 mm. Multiple holes can also be applied, considerably parallel to each other. The hole (70) supports the transfer of heat to the filter section (20).

The formation of the tobacco rod (15) from an extruded or compressed tobacco and carbon composite material, as described above with reference to Figure 1, can also cause it to form the hole (70) easier since that the composite material will help in retaining the shape of the hole and the shape. The addition of a binding agent such as guar gum or adhesive material for cutting tobacco can also be Use as an aid in retaining hole shape.

A cigar (10) similar to that shown in Figure 2, but with a modified filter section (20) is shown in Figure 3. No differences, such as the spaces 65 shown in Figure 2, are provided in FIG. the nozzle paper (25). The air permeates through the nozzle paper (25) and the filter wrap (27) which are naturally porous. In the same way, some smoke constituents. they are able to permeate out of the filter section (20).

A cigar (10) similar to that shown in Figure 1 comprises an alternative arrangement of the filter section (20) shown in Figure 4. In this embodiment, the adsorbent material (50) has been included in the cooling chamber (40), for example in the form of granules filling or filling considerably the cavity of the cooling chamber.

As the cigar (10) is shown in the Figure 1 is illuminated by a user a coal (75) is formed where the tobacco rod (15) and the wrap (26) circumscribing the tobacco rod (15) are burned. A smoke stream is formed that moves toward the filter section (20) as it is formed as a pressure differential. as drawn by a user through the mouth end filter section (55).

The smoke stream is formed from several components, each of which exists in a vapor phase and / or a particle phase. The amount of each smoke component that exists in each phase depends on the temperature of the fumes. The proportion of a particular component of the smoke that exists in the vapor phase increases with the increase in temperature.

As the smoke moves downstream through the tobacco rod (15) towards the filter section (20) the temperature of the smoke falls as it moves further away from the coal (75). The fall in the temperature of the fumes is reduced by factors such as changes in the flow downstream of the smoke. Flow is affected by the use of thin or short tobacco rods through channels or holes of low flow resistance in tobacco and the use of low permeability wraps around the tobacco rod. Additional factors such as the use of thermal conduction materials and reduction of the thermal mass of the tobacco rod are also important factors.

As the smoke reaches the region of high EF material (30) a large proportion of the Constituent travel in the particle phase is removed from the smoke stream. The constituents in the particle phase have higher boiling points than those constituents that travel in the vapor phase. A relatively small amount of the constituents in the vapor phase is inevitably removed from the smoke stream by the high EF material (30). However, a proportion of these components can be diluted from the high EF filtration material (30) as more smoke is subsequently removed through the filter section (20).

The smoke stream passes through the diluent holding material (35) which dilutes the smoke by the addition of other components for the smoke aerosol. As indicated above, the diluent support material (35) can be located either within the region of high EF material (30) or inside the cooling chamber (40).

Within the cooling chamber (40) the smoke is cooled to a lower temperature. As the smoke cools various constituents that were previously in the vapor phase condense in the particle phase.

The speed at which the smoke cools will be affected by factors such as the positioning of the perforations such as space (65) in the paper of nozzle (26) and the natural permeability level of the nozzle paper (25) and the filter envelope (27) as the smoke is ventilated with the ambient air. The spaces 65 can be between 1 and 30 mm in length.

It will be apparent to those skilled in the art that the choice of the nozzle paper (25) and the filter shell (27) is therefore important, since it allows the cooling of the smoke, and the proportions of the components residing in the vapor and particle phases that will be controlled.

As the smoke enters the region of low EF material (45) constituents of the particulate phase are removed. The amount of particulate material removed from the smoke stream in the region of low EF material (45) is less than that removed in the region of high EF material (30) due to the lower filtration efficiency of the region ( 45) with respect to the region (30).

The adsorbent material (50), such as activated carbon or any other adsorbent of the smoke components that are known in the art, can be located within the region of low EF material (45). The adsorbent material (50) removes the smoke components, mainly in the vapor phase.

Finally, the smoke stream is drawn through the mouth end filter section (55). The Mouth end filter section (55) comprises a filter of low EF material. The mouth end filter section (55) can be impregnated with flavorings of a type known in the art, particularly where carbon or other adsorbents have been employed upstream.

Figure 5 shows an alternative filter arrangement. The filter section (20) comprises an annular region of high EF material (80) located on the tobacco rod (15) supported on the filter section (20). The downstream of the annular filter section (80) provides a material support region EF (85). The high material region of EF (80) and the region of material medium EF (85) can be wrapped in thermal conduction material (90), which in turn can be wrapped with an insulating material (95).

The downstream of this medium EF material (85), provides a filter arrangement substantially similar to the arrangement described above with reference to Figure 1. The EF of the region (85) is greater than the EF of the region (45) and lower than the EF of the region (80).

Before use, the center of the annular region (80) forms a longitudinal hole (86) that extends along the length of the annular region (80) that can be approximately 0.1 to 2 mm wide. During use, certain components of the smoke accumulate in the central hole (86), eventually, at least partially block the orifice (86) to the smoke constituents.

Therefore, the pressure drop across the filter region (80) during the first intions, for example, while the filter region (80) is nevertheless heated and while the tobacco bar (15) is the longer one will be different from that after further intions when the filter region (80) has been heated and when the tobacco rod (15) has burned at least partially, and therefore is shorter. The smoke that passes through the filter region (80) after the first draws will contain different proportions of certain smoke components that are smoked by passing through the region (80) of subsequent intions. This is because some smoke that is drawn through the region (80) of the first intion will travel through the central hole (86) and will be unfiltered considerably by the region (80). Nevertheless, the smoke of the subsequent inhalations will be forced through the filtration material located in the outer ring of the annular region (80). Alternative configurations of the filter region (80), which differ in form or composition, which will be apparent to those skilled in the art may be employees .

In the cigar (10) shown in Figure 5 the region of the low EF filtration material (45) can be wrapped in a high porosity filter wrap (96) between the region (45) and the filter shell (45). 27) that can also be of similar porosity. The mouth end filter section (55) may be wrapped in a filter wrapper (97) with a porosity less than that of the filter wrapper (96) which surrounds the region of low filtration material EF (45).

Additional modifications can be made to the various components within the filter section (20) either in combination or separately. For example, the envelope of the filter (27) surrounding the cooling chamber (40) may be impregnated with an aerosol forming material, such as glycerol or an additional coating layer of a material that may contain an aerosol forming material. you can add.

Figure 6 shows a cigar (10) according to even another embodiment. The cigar (10) is similar to that shown in Figure 1, however an annular washer (100) is upstream of the region of the high EF material (30). The washer (100) is centered or the smoke stream channels impinge on the region of high EF material (30) and maintain the speed of the smoke stream as well as to help minimize heat loss. The region of high EF material (30) and washer (100) can be wrapped in thermal conduction material (90) which, in turn, can be wrapped in an insulating material (95).

The washer (100) can be formed of a conductive material thereby further improving the heat transfer to the filter section (20). The cooling chamber (40) can be shaped so as to provide a pressure gradient to assist in the formation of aerosols. Alternatively, the cooling chamber (40) may be at least partially filled with an adsorbent material such as carbon.

The casing (26), which is shown in Figures 1-6, may have the additional heat mode which means that it extends along its length. Figures 7 and 8 show the heat strip mode 1 (10). The conductive heat strips can conduct the heat from the coal (75) to the region of high EF material (30), (80), which is shown in Figures 1-6, thus increasing the fume temperature at the point where the tobacco rod (15) comes out and enters the filter section (20). The conductive, heat strips (110) can be metallic or comprise any other suitable conductive material.

As an alternative or in addition to the strips (110) shown in Figures 7 and 8, a liner inside the envelope (26) or a laminate with the envelope (26) may be included, which may be in the form of aluminized paper.

The heat conduction strips (110) shown in Figures 7 and 8 may alternatively allow heat conductive channels (115) that are formed along the length of the tobacco rod (15). The smoke can be transferred from the coal (75) to the filter section (20) with a reduction of heat loss along these channels (115). The strips may be formed from paper, reconstituted tobacco or any other suitable material that will be apparent to those skilled in the art. The strips can be applied to the wrap (26) before or after the wrap (26) is wrapped around the tobacco rod (15). Figure 8 shows a wrapper (26) with the strips (110) applied thereto before being wrapped around a tobacco rod (15). The strips (110) may extend along part of the length of the tobacco rod (15) or along the entire length of the tobacco rod (15). The channels (115) can alternatively be formed by placing a corrugated inner wrapping material (120) between the sheath (26) and the bar tobacco (15), as shown in Figure 9.

While Figures 7 and 9 show end views of cigars (10) without holes (70) are present, said holes (70) may be present according to various embodiments of the present invention.

Modifications made to alter the temperature profile of the smoke passing through the length of the cigar (10) and the order of the components within the cigar (10) can be made without departing from the scope of the invention which is defined by the attached claims.

It should also be understood that, while the foregoing description refers to cigars, the scope of the present invention may equally apply to other smoking articles known in the art.

Experimental data - The smoke profile of a cigarette similar to that of the cigar (10) shown in Figure 1 was analyzed. The cigar differed from the cigar (10) shown in Figure 1 in that the filter section does not contain thinners , adsorbents or ventilation spaces. Smoke components measured included nicotine particles, particulate water, tar (MPSLN), benzo (a) pyrene (B (a) P) and catechol. ' Also shown in the table are the coefficients of B (a) P to MPSLN and catechol to MPSLN, as well as the number of puffs or puffs of each cigar. The cigar according to the invention was compared with two control cigars and the results are shown in the following table. The cigars were investigated by means of the analysis of inhalations of (55) cubic centimeters (ce) of duration of 2 seconds and with an interval of (30) seconds between the ties.

Table 1 The exemplary cigars according to the invention, together with Control 1 and Control 2 contained the same mixture of tobacco, tobacco rod and the length of the filter. The cigarette label control 1 had a conventional cellulose acetate filter with vents so that the total particulate matter (MPT) matched that of the cigarette of the invention. The so-called control cigar 2 was similar to the invention of the cigar, however the region of high EF filtration material (30) was replaced with a low efficiency cellulose acetate filter. In the invention of the cigar the high EF material was made of glass fiber.

The results, as shown in the above table, show that the proportions of B (a) P and catechol to MPSLN are lower in the example of a cigarette according to the invention than in any of the control cigars. B (a) P and catechol have relatively high boiling points and are therefore eliminated, in their particular phases, by the high EF filter portion.

The embodiments of the invention can therefore be arranged to control the levels of smoke constituents based on their relative boiling points. For example, the high EF filter region of embodiments of the invention can be used to eliminate selectively only the constituents of the smoke having relatively high boiling points, for example, boiling points above a particular temperature, for example above the temperatures in the region of 250 ° C, 300 ° C, 350 ° C, 400 ° C, 450 ° C or 500 ° C. Such constituents would be in the particle phase as they pass through the high EF filter region (30), (80), (85).

By cooling the smoke in the cooling chamber (40), the low filter material EF (45) having the adsorbent material (50), according to certain embodiments of the invention, can selectively remove the components of the smoke that they have relatively low boiling points eg constituents having boiling points below about 300 ° C, 250 ° C, 200 ° C, 150 ° C or 100 ° C.

In order to address various issues and advance the art, the entirety of this description shows by way of illustration several embodiments in which the claimed invention (s) can be put into practice and to provide superior smoking articles. The advantages and characteristics of the description are from a representative sample of only modalities and are not exhaustive and / or exclusive. They are presented only to help understand and teach the claimed characteristics. It must be understood that the advantages, modalities, examples, functions, features, structures, and / or other aspects of the description should not be considered limitations of the description as defined by the claims or limitations in equivalents to the claims, and that other modalities may be used and modifications may be made without departing of the scope and / or object of the description. Various embodiments may suitably comprise, consist, or consist essentially of various combinations of the described elements, components, characteristics, elements, steps, means, etc. In addition, the description includes other inventions that are not currently claimed, but can be claimed in the future.

Claims

1. An article for smoking with a filter that includes: a first region of filtration material ((30), (80), (85)) for the removal of particulate matter from a smoke stream, wherein the smoking article is positioned to improve heat transfer to the first region of filtration material, a second region of the filtration material ((45)) downstream of the first region and of lower filtration efficiency than the filtration efficiency of the first region of the filtration material, and a configuration ((40)) for cooling the smoke stream downstream of the first region of filtration material before entry into the second region.

2. A smoking article according to claim 1, further comprising a bar of smokable material ((15)) wrapped by a wrap ((26)) and placed to form a carbon at one end thereof when illuminated, wherein the envelope has heat conducting bands ((110)) fixed thereto to improve I 27 the transfer of heat from the coal to the first region of filtration material.

3. A smoking article according to claim 2, characterized in that the bar of smokable material comprises at least one channel ((70), (115)) extending therethrough to improve the transfer of heat from the coal towards the first region of filtration material.

4. A smoking article according to claim 3, characterized in that at least one channel is a plurality of channels ((115)) positioned radially on the circumference of the bar of the smokable material.

5. A smoking article according to claim 1, characterized in that the configuration for cooling the smoke comprises a cooling chamber ((40) -).

6. A smoking article according to claim 5, further comprising a region of adsorbent material ((50)) in or downstream of the cooling chamber.

7. A smoking article according to claim 1, characterized in that the configuration for cooling the smoke includes perforations in a casing that circumscribes the filter section.

8. A smoking article in accordance with the claim 1, characterized in that the configuration for cooling the smoke includes at least one space (65) in the envelope circumscribing the filter section.

9. A smoking article according to any preceding claim, further comprising a diluent ((35)).

(10) A smoking article according to claim 9, characterized in that the diluent ((35)) is downstream adjacent to the first region of the filtration material ((30)).

11. An article for smoking according to any of claims 2 to 4, characterized in that the bar of smokable material comprises a granular tobacco compound.

12. An article for smoking according to any of claims 2 to 4, characterized in that the bar of smokable material also comprises carbon.

13. A smoking article according to any preceding claim, characterized in that the filter section is configured to alter the composition of the smoke stream as the smoking article is smoked.

14. An article for smoking according to claim 13, characterized in that the first region

Filtration forms a ring around a hole that becomes clogged as the smoking article is smoked. (fifteen). A smoking article according to any preceding claim, characterized in that the filter section is positioned to channel the smoke stream in the first region of the filtration material.

16. A smoking article according to any preceding claim, characterized in that the first region of the filtration material is surrounded by an insulating material.

17. A smoking article according to any preceding claim, characterized in that the first region of filtration material has a retention value greater than (30) percent.

18. A smoking article according to any preceding claim, characterized in that the first region of filtration material has a retention value greater than (70) percent.

19. An article for smoking according to any preceding claim, characterized in that the article for smoking is positioned in such a way that the first region of the filtration material only removes matter with boiling points or greater than a predetermined level. (twenty) . A smoking article according to claim 21, characterized in that the predetermined level is one of about 250 ° C, 300 ° C, 350 ° C, 400 ° C, 450 ° C or 500 ° C.