• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    thermally conductive rods for use in aerosol generating articles. the present invention relates to a rod formed by a first sheet comprising an aerosol forming material (2) and a second sheet comprising a thermally conductive material (3), wherein the first and second sheets are grouped and circumscribed by a wrapper (12). the rod may be used as a component part of an aerosol generating article.
    公开号:BR112014029583B1
    申请号:R112014029583-2
    申请日:2013-05-30
    公开日:2021-09-14
    发明作者:Alessandro Metrangolo；Pierre-Yves Gindrat；John Faulkner
    申请人:Philip Morris Products S.A.；
    IPC主号:
    专利说明:

    [0001] The present invention relates to rods comprising a sheet of aerosol forming material and a sheet of a thermally conductive material, the sheets being grouped to form a rod for use in aerosol generating articles. The present invention also relates to aerosol generating articles comprising such rods, and methods for forming such rods.
    [0002] Processes and apparatus for producing rags, cords or strips of tobacco material are known in the state of the art. Typically, the width of such patches, cords and strips of tobacco material is about 3 mm or less.
    [0003] For example, patent document US-A-4,000,748 discloses a process and apparatus for shredding a reconstituted tobacco sheet into strips and crimping the resulting strips in a substantially simultaneous operation. The sheet of tobacco material is moved between a pair of stacks of rotating and interspersed discs which shred the sheet into a plurality of strips of about 0.65 to 1.55 mm in width. The forward movement of the resulting strips is retarded by mating with neighboring disc facing surfaces which cause the strips to ripple in a crimped configuration. Crimped strips are considered to provide an increase in weft value.
    [0004] Rod formation for aerosol generating articles comprising patches of crimped or uncrimped tobacco material suffers from a number of disadvantages, including those discussed below.
    [0005] First, shredding tobacco material undesirably generates tobacco fines and other residues.
    [0006] Second, rods comprising patches of tobacco material exhibit 'loose ends'. That is, there is a loss of tobacco material flaps from the ends of the rod. This is exacerbated by the breakage of the tobacco material flaps during rod formation. Loose ends are not only aesthetically undesirable, but can also disadvantageously lead to the need for more frequent cleaning of manufacturing equipment and aerosol generating devices. The loose end problem is particularly exacerbated in aerosol generating articles because the rod length of the aerosol generating substrate tends to be low compared to conventional cigarettes and therefore the proportion of substrate material that lies in the vicinity of a end is larger.
    [0007] Thirdly, rods comprising patches of tobacco material exhibit large standard deviations in weight. That is, rods of the same dimensions tend to be of inconsistent weight. This is in part due to the tendency of rods to exhibit loose ends as mentioned above. The large standard deviation of weight of rods comprising patches of tobacco material leads to an undesirably high rate of rejection of rods whose weight falls outside a selected acceptance range. Furthermore, rods comprising patches of tobacco material exhibit non-uniform densities. That is, the density along the length of the rod tends to be inconsistent. This is due to variations in the amount of tobacco material at different locations along the rod, which results in 'empty spaces', which are regions that have reduced amounts of tobacco material, and in 'cushions', which are regions that have higher levels of tobacco material. The non-uniform density of rods comprising patches of tobacco material can undesirably affect the pull-out strength (RTD) of rods. Furthermore, the non-uniform density of rods comprising patches of tobacco material can lead to loose ends when a void is located at the end of the rod.
    Loose ends, large standard deviations of weight and non-uniform densities as exhibited by rods comprising patches of tobacco material are particularly problematic and undesirable in rods of short rod length. Short rod length rods are sometimes referred to as plugs.
    [0009] Patent document EP-A1-2 062 484 presents a process for forming smokeless tobacco articles for oral consumption. A reconstituted tobacco leaf is gathered on a stick, rolled and cut into pieces suitable for oral consumption.
    [00010] It would be desirable to provide rods comprising tobacco material for use in aerosol generating articles.
    [00011] A rod comprising a first sheet comprising an aerosol-forming material and a second sheet comprising a thermally conductive material can be provided, wherein the first and second sheets are grouped and circumscribed by a wrapper.
    [00012] The grouped sheets of material preferably extend substantially along the entire length of the rod and substantially across the entire cross-sectional area of the rod.
    [00013] Preferred aerosol forming materials include tobacco. The first sheet may be a reconstituted tobacco sheet or a homogenized tobacco sheet, preferably a reconstituted tobacco sheet or a homogenized tobacco sheet which comprises an aerosol former.
    [00014] Preferred thermally conductive materials include metal foil and carbon foil. The thermally conductive sheet can be a sheet of aluminum foil or a sheet of carbon foil.
    [00015] As used in the present invention, the term 'rod' is used to denote a generally cylindrical element of substantially circular, oval or elliptical cross section.
    [00016] As used in the present invention, the term 'sheet' refers to a laminar element that has a width and a length substantially greater than its thickness. The width of a sheet is greater than 10 mm, preferably greater than 20 mm or 30 mm.
    [00017] As used in the present invention, the term "aerosol forming material" refers to a material that can release volatile compounds upon heating to generate an aerosol. An aerosol forming substrate may comprise or consist of an aerosol forming material.
    [00018] As used in the present invention, the term 'rod length' refers to the dimension in the direction of the cylindrical axis of the rods as described in the present invention.
    [00019] As used in the present invention, the term 'homogenized tobacco material' refers to a material formed by the agglomeration of particulate tobacco.
    [00020] As used herein, the term 'grouped' denotes that the sheet of tobacco material is rolled, folded, or otherwise compressed or constricted substantially transversely to the cylindrical axis of the rod.
    [00021] As used in the present invention, the terms 'upstream' and 'downstream' are used to describe the relative positions of the components, or parts of components, of the aerosol generating articles comprising the rods as described in present invention with respect to the direction of air drawn through aerosol generating articles during use thereof.
    [00022] A rod formed from a grouped sheet of a suitable aerosol-forming material may be particularly advantageous as a component of an aerosol-generating article, in particular a heated aerosol-generating article.
    [00023] Heated aerosol generating systems operate by heating an aerosol-forming substrate to generate an aerosol from the substrate material. The aerosol can then be inhaled by a consumer. A sheet of aerosol-forming material can have low thermal conductivity, however. This means that it can be difficult to evenly heat a rod or plug formed from a sheet of aerosol-generating material. Differential heating can result in some parts of the rod or plug heating to a high temperature. These rod parts can sing and release or evolve unpleasant-tasting volatile components, or the volatile substances in these parts can be evolved and wasted too quickly for a satisfying user experience. Other parts of the rod or plug that are further away from the heat source may not reach a sufficient temperature to evolve volatile substances.
    [00024] Thermal transfer can be significantly improved by forming a rod from a first sheet of an aerosol-forming material and a second sheet of a thermally conductive material, wherein the first and second sheets are grouped together to form the rod. The bundled sheet of thermally conductive material is preferably interwoven with the bundled sheet of aerosol-forming material, and the thermally conductive material allows for rapid and efficient conduction of heat throughout the rod.
    [00025] An efficient heat transfer can mean that the operating temperature of a heat source to an aerosol generating system can be reduced. This can have the advantageous effect of minimizing scorching of any part of the aerosol generating substrate. Efficient thermal transfer can also mean that desirable volatile substances are evolved from the entire aerosol-forming substrate which comprises an aerosol-forming material and a thermally conductive material. Thereby, there can be a more efficient use of the aerosol forming material.
    [00026] The first sheet of material can be a textured sheet of material. The use of a textured sheet of material can advantageously facilitate grouping the sheet to form a rod as described in the present invention. The second sheet of material can be a textured sheet of material. Both the first and second sheets of material can be textured sheets of material.
    [00027] As used in the present invention, the term 'textured sheet' refers to a sheet that is crimped, shaped, chipped, perforated or otherwise deformed. Textured sheets of material, such as homogenized tobacco, may comprise a plurality of indentations, projections, perforations, separate from one another, or a combination of these.
    [00028] According to a particularly preferred embodiment, a rod is provided comprising a crimped sheet of aerosol-forming material and a sheet of a thermally conductive material, wherein the sheets are grouped and circumscribed by a wrapper.
    [00029] As employed in the present invention, the term 'crimped sheet' lends itself to be synonymous with the term 'crepe sheet' and refers to a sheet having a plurality of substantially parallel ridges or corrugations. Preferably, a crimped sheet of aerosol forming material, for example a crimped sheet of homogenized tobacco material, has a plurality of ridges or corrugations substantially parallel to the cylindrical axis of the rod in accordance with the specification. This advantageously facilitates grouping the crimped sheet of aerosol forming material to form the rod. However, it should be appreciated that the crimped sheets of aerosol forming material may alternatively or additionally have a plurality of substantially parallel ridges or corrugations disposed at an acute or obtuse angle to the cylindrical axis of the rod.
    [00030] In certain embodiments, the sheets of material may be substantially uniformly textured over substantially their entire surface. For example, the crimped sheets of material may comprise a plurality of substantially parallel ridges or corrugations that are substantially uniformly spaced from one another across the width of the sheet.
    [00031] Preferably, the second sheet, or thermally conductive sheet, is not crimped before being grouped with the first sheet of material. While crimping can increase the ability of a sheet of aerosol-generating material to be grouped in the shape of a rod, crimping can reduce the ability of a sheet of thermally conductive material to be grouped together to form a rod. For example, the sheet of thermally conductive material can be a metallic sheet. Crimping a sheet metal sheet results in a corrugated sheet metal sheet, which can have increased stiffness. A corrugated sheet may be more difficult to assemble into a rod with the sheet of aerosol forming material than an uncorrugated sheet.
    [00032] A rod may comprise one or more additional sheets of material grouped with the first and second sheets to form the rod. Any additional sheet or sheets can be textured, eg crimped before picking. Any additional sheet or sheets may comprise additional aerosol forming materials, such as one or more additional sheets of homogenized tobacco.
    [00033] A rod as described in the present invention can be used as an aerosol forming substrate in an aerosol generating article.
    [00034] An aerosol generating article comprising a rod as described in the present invention may be provided.
    [00035] A series of aerosol generating articles in which an aerosol forming substrate is heated and not burnt has been proposed in the prior art. Typically in heated aerosol generating articles, an aerosol is generated by transferring heat from a heat source, for example, a chemical, electrical or fuel heat source, to a physically separate aerosol-forming substrate, which can be located within, around or downstream of the heat source.
    [00036] As used in the present invention, the term 'aerosol forming substrate' refers to a substrate consisting of or comprising an aerosol forming material that can release volatile compounds upon heating to generate an aerosol. A sheet of tobacco material is an aerosol forming substrate for the purposes of this specification.
    [00037] Rods as described in the present invention are particularly suitable for use as aerosol forming substrates of heated aerosol generating articles. Aerosol forming substrates in heated aerosol generating articles typically are significantly shorter in rod length than combustible smokable material rods in conventional lit-end smoking articles. As noted above, the high non-uniform densities that are exhibited by rods comprising patches of tobacco material are particularly undesirable in rods of aerosol generating material which have a short rod length. The use of short rods as described in the present invention as aerosol generating substrates in heated aerosol generating articles advantageously minimizes or avoids one or more of the disadvantages associated with the use of the short rods comprising the previously discussed tobacco material patches above.
    [00038] In one embodiment, rods as described in the present invention can be used as aerosol forming substrates in heated aerosol generating articles comprising a combustible heat source and an aerosol generating substrate downstream of the combustible heat source.
    [00039] For example, rods as described in the present invention can be used as aerosol generating substrates in heated aerosol generating articles of the type shown in patent document WO-A-2009/022232, which comprise a heat source carbon-based fuel, an aerosol generating substrate downstream of the fuel heat source, and a thermally conductive element around and in contact with a rear portion of the carbon fuel-based heat source and an adjacent front portion of the aerosol generating substrate. However, it should be appreciated that rods as described in the present invention can also be used as aerosol generating substrates in heated aerosol generating articles comprising combustible heat sources having other constructions.
    [00040] The thermal conduction facilitated by the sheet of thermally conductive material can be particularly efficient along the longitudinal axis of the rod. In this way, heat from a combustible heat source located at one end of the rod can be transferred more efficiently to the aerosol forming material located downstream of the heating element. More efficient heat transfer can allow the use of a longer length aerosol-forming substrate, in other words a substrate that extends a greater distance away from the heat source. This may be desirable to increase the amount of usable aerosol-forming material that is present in the article.
    [00041] In another embodiment, rods as described in the present invention can be used as aerosol generating substrates in heated aerosol generating articles for use in electrically operated aerosol generating systems in which the aerosol generating substrate of the generating article heated aerosol is heated by an electrical heat source.
    [00042] For example, rods as described in the present invention can be used as aerosol generating substrates in heated aerosol generating articles of the type disclosed in patent document EP-A-0 822 670.
    [00043] A system comprising an electrically operated aerosol generating apparatus and an aerosol generating article for use with the apparatus may be provided. The aerosol generating article comprises a rod or an aerosol forming substrate as described in the present invention.
    [00044] Inserting and removing heated aerosol generating articles from an electrically operated aerosol generating system, for example, an electrically heated aerosol generating system, wherein such articles include a rod comprising scraps of tobacco material, tends to dislodge the tobacco material scraps from the rod. This can disadvantageously result in the need for more frequent cleaning of the electrical heat source and other parts of the electrically operated aerosol generating system in order to remove dislodged patches.
    [00045] On the other hand, insertion and removal of heated aerosol generating articles including an aerosol generating substrate comprising a rod as described in the present invention is less likely to result in dislodgement of the tobacco material. Furthermore, the more efficient heat transfer provided by the presence of a sheet of thermally conductive material on the substrate can allow the length of the heating elements to be reduced. For systems that involve inserting a heating element into an aerosol-forming substrate, a reduced length of the heating element can result in lower insertion force and lower removal force.
    [00046] An electrically heated aerosol generating system can apply a varied heating profile during consumption of an aerosol generating article in order to optimize the user experience. The presence of a thermally conductive sheet can help the aerosol generation to be more responsive to variations in thermal energy applied by the heater.
    [00047] A filter for an aerosol generating article may be employed, wherein the filter comprises a rod as described in the present invention. Rods can be used in filters for both lit-end aerosol generating articles, such as conventional smoking articles, and heated aerosol generating articles. Rods as described in the present invention can be used in filters that comprise a single segment of the filter. Rods as described in the present invention can also be used in multi-component filters which comprise two or more filter segments.
    [00048] Filters comprising tobacco-containing filter segments are known in the state of the art. For example, EP-A-1 889 550 discloses a multi-component filter for a smoking article comprising: a mouth end segment; a first flavor release segment comprising tobacco or another plant leaf upstream of the mouth end segment; and a second flavor release segment comprising filtration material and a flavoring upstream of the first flavor release segment. The pull-out strength of the second flavor release segment is greater than the pull-out strength of the first flavor release segment and the pull-out strength of the second flavor release segment is greater than the pull-out strength of the tip segment from the mouth.
    [00049] Advantageously, the presence of a thermally conductive sheet grouped in a filter as described in the present invention can facilitate the dissipation of heat that can then be unpleasant for a user. This can be particularly advantageous in the context of conventional cigarettes where the tobacco burn line approaches the filter during the final stages of a smoking experience.
    [00050] In certain embodiments, rods as described in the present invention can be used as tobacco-containing filter segments in single-component or multi-component filters. For example, rods as described in the present invention can be used as a first flavor release segment in multi-component filters of the type disclosed in patent document EP-A-1 889 550.
    [00051] Filters comprising rods as described in the present invention may also comprise one or more filtration materials for removing particulate components, gaseous components or a combination thereof. Suitable filtration materials are known in the art and include, but are not limited to: fibrous filtration materials such as, for example, cellulose acetate tow and paper; adsorbents such as, for example, activated alumina, zeolites, molecular sieves and silica gel; biodegradable polymers that include, for example, polylactic acid (PLA), Mater-Bi®, and bioplastics; and combinations thereof.
    [00052] Alternatively or additionally, filters comprising rods as described in the present invention may also comprise one or more smoke or aerosol modifying agents. Suitable smoke and aerosol modifying agents are known in the art and include, but are not limited to: flavorings such as, for example, menthol.
    [00053] Preferably, the rods according to the specification are of substantially uniform cross-section.
    [00054] Rods can be produced according to the descriptive report which have different dimensions depending on their intended use.
    [00055] For example, rods according to the specification can have a diameter between about 5 mm and about 10 mm, depending on their intended use.
    [00056] For example, rods according to the specification can have a rod length between about 5 mm and about 150 mm, depending on their intended use.
    [00057] In preferred embodiments, rods according to the specification for use as aerosol forming substrates in heated aerosol generating articles may have a rod length between about 5 mm and about 20 mm or about 30 mm .
    [00058] In other embodiments, rods according to the specification for use in filters for conventional lit-end smoking articles and heated aerosol generating articles may have a rod length between about 5 mm and about 30 mm .
    [00059] Rods according to the specification of a desired unitary rod length can be produced by forming a multiple unit rod length rod and then the multiple unit rod length rod is cut and divided into multiple rods of desired unit rod length.
    [00060] For example, rods having a rod length of about 15 mm for use as aerosol forming substrates in heated aerosol generating articles can be produced by forming a rod having a rod length of about of 150 mm and then the elongated rod is divided into ten rods that have a rod length of about 15 mm.
    [00061] Preferred embodiments comprise sheets of homogenized tobacco material. Sheets of homogenized tobacco material can be formed by agglomerating the particulate tobacco obtained by milling or otherwise grinding, or both, tobacco leaf lamina and tobacco leaf stalks. Alternatively, or in addition, the tobacco leaves of the homogenized tobacco material may comprise one or more of tobacco dust, tobacco fines and other particulate tobacco by-products formed during, for example, treatment, handling and transport of tobacco. Where the rods according to the specification lend themselves to use as aerosol forming substrates in heated aerosol generating articles, the sheets of homogenized tobacco material used to form the rods preferably comprise particulate tobacco obtained by milling or else shredding tobacco leaf blades.
    [00062] In certain embodiments, the sheets of homogenized tobacco material may have a tobacco content of at least about 40% by weight on a dry weight basis or at least about 50% by weight on a weight basis dry. In other embodiments, the sheets of homogenized tobacco material can have a tobacco content of about 70% or more by weight on a dry weight basis. Where rods according to the specification lend themselves to use as aerosol forming substrates in heated aerosol generating articles, the use of sheets of homogenized tobacco material which have high tobacco contents advantageously generates aerosols with enhanced tobacco flavor.
    [00063] Sheets of homogenized tobacco material may comprise one or more intrinsic binders, i.e. endogenous tobacco binders, one or more extrinsic binders, i.e. exogenous tobacco binders, or a combination thereof to help agglomerate tobacco particulate. Alternatively, or in addition, sheets of homogenized tobacco material may comprise other additives including, but not limited to, tobacco and non-tobacco fibers, aerosol formers, humectants, plasticizers, flavorings, fillers, aqueous solvents. and non-aqueous, and combinations thereof.
    [00064] Extrinsic binders suitable for inclusion in sheets of homogenized tobacco material for use in forming a rod as described in the present invention are known in the art and include, but are not limited to: gums such as , for example, guar gum, xanthan gum, arabic gum and locust bean gum; cellulosic binders such as, for example, hydroxy propyl cellulose, carboxy methyl cellulose, hydroxy ethyl cellulose, methyl cellulose and ethyl cellulose; polysaccharides such as, for example, starches, organic acids such as alginic acid, salts of conjugated bases of organic acids such as sodium-alginate, agar and pectins; and combinations thereof.
    [00065] Non-tobacco fibers suitable for inclusion in sheets of homogenized tobacco material are known in the prior art and include, but are not limited to: cellulose fibers; soft wood fibers; hardwood fibers; jute fibers, and combinations thereof. Prior to inclusion in sheets of homogenized tobacco material, the non-tobacco fibers may be treated by suitable processes known in the prior art including, but not limited to: mechanical pulping; refining; chemical pulp formation; bleaching; sulphate pulping; and combinations thereof.
    Sheets of homogenized tobacco material for use in rod formation as described in the present invention must have a tensile strength sufficiently high to survive bundling to form rods. In certain embodiments, non-tobacco fibers can be included in sheets of homogenized tobacco material in order to obtain an appropriate tensile strength.
    [00067] For example, sheets of homogenized tobacco material for rod formation as described in the present invention may comprise between about 1% and about 5% by weight of non-tobacco fibers on a dry weight basis .
    [00068] Aerosol formers and humectants suitable for inclusion in sheets of homogenized tobacco material are known in the prior art and include, but are not limited to: polyhydric alcohols such as triethylene glycol, ,3-butane diol and glycerin; esters of polyhydric alcohols such as glycerol mono-, dior triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl tetradecanedioate.
    [00069] For example, where rods according to the specification lend themselves to use as aerosol forming substrates in heated aerosol generating articles, sheets of homogenized tobacco material for use in rod formation as described herein invention may have an aerosol former content of between about 5% and about 30% by weight on a dry weight basis. Rods that lend themselves to use in an electrically operated and electrically operated aerosol generating system having a heating element may preferably include greater than 5% to about 30% aerosol former. For rods that lend themselves to use in an electrically operated aerosol generating system that has a heating element, the aerosol former may preferably be glycerin.
    [00070] It should be appreciated that the composition of sheets of homogenized tobacco material can be designed to meet regulatory requirements.
    [00071] A series of reconstitution processes to produce sheets of homogenized tobacco materials is known in the prior art. These include, but are not limited to: papermaking processes of the type described, for example, in patent document US-A-3,860,012; casting or 'cut sheet' processes of the type described, for example, in patent document US-A-5,724,998; mass reconstitution processes of the type described, for example, in patent document US-A-3,894,544; and extrusion processes of the type described, for example, in patent document GB-A-983,928. Typically, the densities of sheets of homogenized tobacco material produced by extrusion processes and by mass reconstitution processes are greater than the densities of sheets of homogenized tobacco materials produced by casting processes.
    [00072] Sheets of homogenized tobacco material for use in rod formation as described in the present invention are preferably formed by a casting process of the type comprising generally casting a slurry comprising the particulate tobacco and a or more binders on a conveyor belt or other support surface, drying the cast slurry to form a sheet of homogenized tobacco material, and removing the sheet of homogenized tobacco material from the support surface.
    [00073] For example, in certain embodiments sheets of homogenized tobacco material can be formed from the slurry comprising particulate tobacco, guar gum, cellulose fibers and glycerin by a casting process.
    [00074] Sheets of homogenized tobacco material can be textured by using machinery suitable for texturing filter tow, paper and other materials.
    [00075] For example, sheets of tobacco material homogenized for the formation of rods as described in the present invention can be crimped using a crimping unit of the type described in patent document CH-A-691156, which comprises a pair of rotating crimping rollers. However, it should be appreciated that the sheets of homogenized tobacco material can be textured using other appropriate machinery and processes that deform or perforate the sheets of homogenized tobacco material.
    [00076] The rods according to the specification can be produced from sheets of homogenized tobacco material and sheets of thermally conductive material which have different dimensions depending on their intended use. The sheets of homogeneous tobacco material and thermally conductive material should have a width sufficient to be grouped together to form a rod as described in the present invention.
    [00077] Preferably, the sheets of tobacco material and the sheets of thermally conductive material for use in rods as described in the present invention have a width of at least about 25 mm.
    [00078] In certain embodiments, sheets of material for use in rods as described in the present invention may have a width between about 25 mm and about 300 mm.
    [00079] Preferably, the sheets of material making up the rod have a combined thickness of at least about 50 µm to about 300 µm.
    [00080] In certain embodiments, the individual sheets of material can have a thickness between 10 µm and about 250 µm. Thermally conductive sheets such as aluminum foil sheets may have a smaller thickness than sheets of aerosol-forming material.
    [00081] In certain embodiments, sheets of homogenized tobacco material can have a grammage of 100 g/m2 and about 300 g/m2.
    The rods as described in the present invention may comprise an assembled sheet of homogenized tobacco material circumscribed by a porous wrap or a non-porous wrap.
    [00083] In certain embodiments, rods as described in the present invention may comprise a sheet of homogenized tobacco material and a sheet of thermally conductive material grouped and circumscribed by a wrapping paper.
    [00084] Suitable paper wrappers are known in the art and include, but are not limited to: cigarette papers; and filter plug wraps.
    [00085] In other embodiments, the rods as described in the present invention may comprise a wrapper other than paper. Rods as described in the present invention can be produced using conventional cigarette making and filter making machinery adapted to allow bundling of two or more sheets simultaneously.
    [00086] For example, rods comprising a crimped sheet of homogeneous tobacco material and a sheet of thermally conductive material can be produced by using an adaptation of machinery to form filter rods comprising a crimped sheet of paper grouped together. The type described in patent document CH-A-691156. The machinery could be adapted to allow a sheet of thermally conductive material to be grouped with the crimped tobacco sheet.
    [00087] A method of forming a rod can be provided as described in the present invention, which comprises the steps of: providing a first web comprising an aerosol forming material, providing a second web comprising a thermally conductive material, simultaneous grouping of the first and second continuous sheets transversely to their longitudinal axes; circumscribing the leaves grouped with a wrapping to form a continuous rod, and dividing the continuous rod into a plurality of distinct rods. The aerosol forming material can be any aerosol forming material described above, and is preferably homogenized tobacco. The thermally conductive material can be any thermally conductive material described above, and is preferably an aluminum foil.
    [00088] The method can also comprise texturing the first continuous sheet. For example, the method may comprise crimping, shaping, punching or otherwise texturing the first web before grouping the first web with the second web.
    [00089] Preferably, the method also comprises crimping the first continuous sheet.
    [00090] Both the first and second continuous sheets can be textured, eg beaded. Preferably, the first web of aerosol-forming material is crimped, but the second web of thermally conductive material is not crimped.
    [00091] The specific modalities will be further described, by way of example only, with reference to the attached drawings, in which: Figure 1 shows a schematic cross section of the apparatus for forming a rod according to a specific modality; Figure 2 shows a schematic cross-section of the apparatus for forming a rod according to a specific modality; Figure 3 illustrates an embodiment of an aerosol generating device incorporating rods formed as described in the present invention; and Figure 4 illustrates an aerosol generating system comprising an electrically operated aerosol generating device and an aerosol generating article as illustrated in Figure 3.
    [00092] The apparatus shown in Figure 1 generally comprises: a feed means for providing a continuous sheet of homogenized tobacco material; a feed means for providing a continuous sheet of aluminum foil material; a crimping means for crimping the continuous sheet of homogenized tobacco material; rod forming means for grouping the continuous crimped sheet of homogenized tobacco material with the continuous sheet of aluminum foil material and circumscribing the grouped material with a wrap to form a continuous rod; and a cutting means for dividing the continuous rod into a plurality of distinct rods. The apparatus also comprises a transport means for transporting the web of homogenized tobacco material downstream through the apparatus, from the feed means to the rod-forming means through the crimping means.
    [00093] As shown in Figure 1, the feeding means for supplying a continuous sheet of homogenized tobacco material comprises a continuous sheet of homogenized tobacco material 2 mounted on a first coil 4. The feeding means for supplying a continuous sheet of aluminum foil material comprises a continuous sheet of aluminum foil 3 mounted on a second spool 5. The crimping means comprises a pair of rotating crimping rollers 6. In use, the continuous sheet of homogenized tobacco material 2 is extracted of the first spool 4 and transported downstream to the pair of crimping rollers 6 by the transport mechanism through a series of guide rollers and tensioners. While the web of homogenized tobacco material 2 is fed between the pair of crimping rollers 6, the crimping rollers couple and crimp the web of homogenized tobacco material 2 to form a continuous crimped sheet of homogenized tobacco material 8 which has a plurality of ridges or corrugations spaced apart from one another substantially parallel to the longitudinal axis of the sheet of tobacco material homogenized through the apparatus.
    [00094] The continuous crimped sheet of homogenized tobacco material 8 is transported downstream of the pair of crimping rollers 6 towards the rod-forming means. The continuous sheet of aluminum foil material 3 is conveyed from the second coil 5 to the rod-forming means. Both the web of aluminum foil material 3 and the web of crimped homogenized tobacco material 8 are fed simultaneously through a converging funnel or horn 10. The converging funnel 10 groups the webs of material 8, 3 transversely to each other. to its longitudinal axes. The continuous sheets of material 8, 3 assume a substantially cylindrical configuration as they pass through the converging funnel 10.
    [00095] With the removal of the converging funnel 10, the grouped sheets of homogenized tobacco material and the aluminum foil material are wrapped in a web of wrapping material 12. The web of wrapping material is fed from a coil 14 and wrapped around the grouped continuous crimped sheet of tobacco material homogenized by an endless conveyor belt or a trim. As shown in Figure 1, the rod-forming means comprises an adhesive applying means 16 which applies adhesive to one of the longitudinal edges of the wrapping material web so that when the opposing longitudinal edges of the web of material envelope are placed in contact, adhere to each other to form a continuous rod.
    [00096] The rod forming means also comprises a drying means 18 downstream of the adhesive applying means 16 which, in use, dries the adhesive applied to the continuous rod splice as the continuous rod is transported downstream of the rod-forming medium to cutting medium.
    [00097] The cutting means comprises a rotary cutter 20 that divides the continuous rod into a plurality of distinct rods of single rod length or multiple unit rod length.
    [00098] While the two continuous sheets of material are fed into the converging hopper as they are coated, one sheet on top of the other, the rod has an even distribution of tobacco and aluminum material along the length of the rod.
    [00099] In an alternative configuration illustrated in Figure 2, a web of aluminum foil material 3 is positioned in an overlapping relationship with a web of homogenized tobacco material 2 upstream of a pair of crimping rollers 6. The apparatus is then substantially as described above with respect to Figure 1.
    [000100] Both continuous sheets of material 2.3 pass through the crimping rollers 6 in the overlapping ratio and are crimped simultaneously. A crimped pair of webs 9 passes out of the crimp rollers 6 and downstream towards the converging funnel 10 to be formed as a rod.
    [000101] Figure 3 illustrates an embodiment of an aerosol generating article 1000 comprising a rod as described in the present invention. Article 1000 comprises four elements; an aerosol forming substrate 1020, a hollow tube 1030 of cellulose acetate, a spacer element 1040, and a nozzle filter 1050. These four elements are sequentially arranged and in coaxial alignment and assembled by a 1060 cigarette paper to form the aerosol generating article 1000. The article 1000 has a mouth end 1012, which a wearer introduces into their mouth during use, and a distal end 1013 located at the opposite end of the article to the mouth end 1012. The aerosol generating article illustrated in Figure 3 is particularly suitable for use with an electrically operated aerosol generating device comprising a heater for heating the aerosol forming substrate.
    [000102] When assembled, article 1000 is about 45 mm long and has an outer diameter of about 7.2 mm and an inner diameter of about 6.9 mm.
    [000103] The aerosol forming substrate 1020 comprises a rod formed from a first crimped cast sheet tobacco sheet and a second sheet of aluminum foil wrapped in a filter paper (not shown) to form a plug.
    [000104] An aerosol generating article 1000 as illustrated in Figure 3 is designed to couple with an aerosol generating device in order to be consumed. Such an aerosol generating device includes a means for heating the aerosol forming substrate 1020 to a temperature sufficient to form an aerosol. Typically, the aerosol generating device may comprise a heating element that surrounds the aerosol generating article 1000 adjacent to the aerosol forming substrate 1020, or a heating element that is inserted into the aerosol forming substrate 1020.
    [000105] Once coupled with an aerosol generating device, a user brings at the mouth end 1012 of the smoking article 1000 and the aerosol forming substrate 1020 is heated to a temperature of about 375 degrees Celsius. At this temperature, volatile compounds are evolved from the cast sheet tobacco sheet of aerosol forming substrate 1020. These compounds condense to form an aerosol. The aerosol is drawn through the 1050 filter and into the user's mouth.
    [000106] Figure 4 illustrates a portion of an electrically operated aerosol generating system 2000 that uses a heater blade 2100 to heat an aerosol generating substrate 1020 of an aerosol generating article 1000. The heating blade is mounted within a aerosol article receiving the chamber of an electrically operated aerosol generating device 2010. The aerosol generating device defines a plurality of air holes 2050 to allow air to flow to the aerosol generating article 1000. The air flow is indicated by arrows in Figure 4. The aerosol generating device comprises a power supply and electronic components, which are not illustrated in Figure 4. The aerosol generating article 1000 of Figure 4 is as described with respect to Figure 3. Example 1
    [000107] Rods according to a first specific modality comprising a crimped sheet of homogenized tobacco material grouped with an uncrimped sheet of aluminum foil, circumscribed in a paper wrap and with a rod length of 12 mm and diameters between 6.9 mm and 7.2 mm were produced at ratios between 20 m/min and 25 m/min when using a device of the type shown in Figure 1.
    [000108] The continuous sheets of homogenized tobacco material were produced by a casting process, in which the sheets have a width between 110 mm and 134 mm, a thickness of 120 μm to 260 μm, a weight between 167 g/m2 and 201 g/m2 and a moisture content between 5% and 12%.
    [000109] The continuous sheets of aluminum foil material were produced by a lamination process. The sheets used were the same width as the sheets of homogenized tobacco material and had a thickness of 25 µm.
    [000110] The exemplary modalities and the example described above are not limiting. In view of the exemplary embodiments discussed above, other embodiments consistent with the above exemplary embodiment will now be apparent to a person skilled in the art.
    权利要求:
    Claims (13)
    [0001]
    1. Rod, characterized in that it comprises a first sheet comprising an aerosol forming material (2) and a second sheet comprising a thermally conductive material (3), the first sheet and the second sheet being brought together so as to be compressed or contracted transversely with respect to their longitudinal axes and circumscribed by a casing (12), in which the first sheet is crimped and the second sheet is not crimped.
    [0002]
    2. Rod according to claim 1, characterized in that the aerosol forming material (2) comprises tobacco.
    [0003]
    3. Rod according to claim 1 or 2, characterized in that the first sheet (2) is a sheet of homogenized tobacco material.
    [0004]
    4. Rod according to claim 1, 2, or 3, characterized in that the thermally conductive material (3) comprises at least one material selected from the group consisting of carbon and metal.
    [0005]
    5. Rod according to claim 4, characterized in that the second sheet (3) is an aluminum sheet.
    [0006]
    6. Rod according to any one of the preceding claims, characterized in that it additionally comprises one or more additional sheets of material grouped with the first and second sheets and circumscribed by the wrap.
    [0007]
    7. Aerosol forming substrate for a heated aerosol generating article, characterized in that it comprises a rod as defined in any one of claims 1 to 6.
    [0008]
    8. System, characterized in that it comprises an electrically operated aerosol generating apparatus and an aerosol generating article to be used with the apparatus, wherein the aerosol generating article comprises an aerosol forming substrate as defined in claim 7.
    [0009]
    9. Heated aerosol generating article, characterized in that it comprises a combustible heat source and an aerosol forming substrate as defined in claim 7 located downstream of the combustible heat source.
    [0010]
    10. Heated aerosol generating article, characterized in that it is to be used in an electrically heated aerosol generating system comprising an aerosol forming substrate as defined in claim 7.
    [0011]
    11. Method of forming a rod as defined in any one of claims 1 to 6, characterized in that it comprises the steps of: provision of a first continuous sheet comprising an aerosol forming material (2), provision of a second continuous sheet comprising a thermally conductive material (3), simultaneous grouping of the first and second continuous sheets so as to be compressed or contracted transversely with respect to their longitudinal axes; circumscribing the sheets grouped with a wrap (12) to form a continuous rod, and dividing the continuous rod into a plurality of distinct rods.
    [0012]
    12. Method according to claim 11, characterized in that the first continuous sheet (2) is crimped before grouping.
    [0013]
    13. Method according to claim 12, characterized in that the second continuous sheet is not crimped before grouping.
    类似技术:
    公开号 | 公开日 | 专利标题
    BR112014029583B1|2021-09-14|SUBSTRATE AND METHOD FOR THE FORMATION OF THERMALLY CONDUCTING RODS, AND AEROSOL GENERATING ARTICLE AND SYSTEM
    BR112014029622B1|2020-12-08|rod for use as an aerosol-generating substrate in a heated aerosol-generating article, smoking article, aerosol-forming substrate for an aerosol-generating article, system and heated aerosol-generating article and method of forming a rod
    US10010110B2|2018-07-03|Electrically operated aerosol generating system
    BR112014029738B1|2021-03-23|BASTONETS, AEROSOL GENERATOR ARTICLE, AEROSOL FORMATING SUBSTRATE, SYSTEM AND METHOD OF FORMING A BASEONET
    CN108813721B|2022-03-11|Heat conducting rod for use in aerosol-generating articles
    CN109090682B|2022-03-18|Heat conducting rod for use in aerosol-generating articles
    同族专利:
    公开号 | 公开日
    IL235624A|2020-10-29|
    JP6718860B2|2020-07-08|
    NO3090639T3|2018-08-04|
    MX370743B|2019-12-20|
    AU2013269591A1|2015-01-22|
    EP3348152B1|2020-04-22|
    RU2014153639A|2016-07-20|
    EP3090639B1|2018-03-07|
    ES2665197T3|2018-04-24|
    US10568357B2|2020-02-25|
    EP3090639A1|2016-11-09|
    RS54958B1|2016-11-30|
    AU2013269591B2|2016-07-07|
    KR102142343B1|2020-08-10|
    CN109090682A|2018-12-28|
    DK2854569T3|2016-09-12|
    UA114630C2|2017-07-10|
    HK1203773A1|2015-11-06|
    JP6557139B2|2019-08-07|
    IL235624D0|2015-01-29|
    ZA201408205B|2016-08-31|
    CN108813721A|2018-11-16|
    PH12014502503A1|2014-12-22|
    AR091212A1|2015-01-21|
    EP2854569A1|2015-04-08|
    CN104427890A|2015-03-18|
    HK1255624A1|2019-08-23|
    SG11201407910XA|2014-12-30|
    JP2015517819A|2015-06-25|
    PL3090639T3|2018-08-31|
    HUE029904T2|2017-04-28|
    TW201404318A|2014-02-01|
    BR112014029583A2|2017-06-27|
    PT2854569T|2016-08-05|
    IN2014DN09439A|2015-07-17|
    EP3348152A1|2018-07-18|
    MY167444A|2018-08-28|
    KR20150023301A|2015-03-05|
    EP2854569B1|2016-07-06|
    NZ703078A|2016-05-27|
    JP2018082711A|2018-05-31|
    WO2013178768A1|2013-12-05|
    PL3348152T3|2020-11-02|
    CA2875186A1|2013-12-05|
    LT3090639T|2018-04-25|
    RU2632277C2|2017-10-03|
    US20150181938A1|2015-07-02|
    ES2589758T3|2016-11-16|
    HUE039050T2|2018-12-28|
    DK3090639T3|2018-04-09|
    MX2014014623A|2015-02-12|
    SI3090639T1|2018-05-31|
    CN104427890B|2018-08-10|
    PL2854569T3|2016-12-30|
    PT3090639T|2018-06-11|
    CA2875186C|2020-06-23|
    TWI639393B|2018-11-01|
    RS57128B1|2018-07-31|
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    法律状态:
    2018-03-06| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2018-03-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2018-03-20| B06I| Publication of requirement cancelled [chapter 6.9 patent gazette]|Free format text: ANULADA A PUBLICACAO CODIGO 6.6.1 NA RPI NO 2462 DE 13/03/2018 POR TER SIDO INDEVIDA. |
    2019-09-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-16| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-07-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-09-14| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/05/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP12170359|2012-05-31|
    EP12170359.9|2012-05-31|
    PCT/EP2013/061210|WO2013178768A1|2012-05-31|2013-05-30|Thermally conducting rods for use in aerosol-generating articles|
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