Tubular element comprising a porous medium for use with an aerosol generating article

Abstract

The present invention provides a tubular element comprising a first longitudinal channel and a porous medium loaded with a gel (125), the gel containing an active agent, wherein the porous medium loaded with the gel is corrugated, for use with an aerosol generating article, for use with an aerosol generating device. The active agent can be released from the tubular element into the generated or released aerosol, preferably upon heating the tubular element.

Description

Technical Field

[0001] The present disclosure relates to a tubular element for use with an aerosol-generating article, wherein the tubular element comprises a porous medium loaded with a gel. Background Art

[0002] Nicotine-containing articles for use with aerosol-generating articles are known. Typically, the article contains a liquid, such as an electronic cigarette liquid (e-liquid), which is heated by a coiled resistive wire to release an aerosol. The manufacture, transportation and storage of such liquid-containing aerosol-generating articles can be problematic and may result in leakage of the liquid and the liquid contents.

[0003] It would be desirable to provide a tubular element for use in aerosol-generating articles and devices, wherein the tubular element has little or no leakage.

[0004] It is also desirable to provide a tubular element that includes a flow control system that effectively delivers an aerosol generated from the tubular element when heated by an aerosol generating device. Summary of the invention

[0005] According to the present invention, there is provided a tubular element comprising a first longitudinal channel and further comprising a porous medium loaded with a gel; the gel comprising an active agent. In a specific embodiment, the tubular element further comprises a wrap.

[0006] The present invention provides a tubular element comprising a first longitudinal channel and further comprising a porous medium loaded with a gel; the gel comprises an active agent; wherein the porous medium loaded with the gel is corrugated.

[0007] In some embodiments, the tubular element comprises a wrap. In some embodiments, the tubular element comprises a wrap, wherein the wrap comprises paper.

[0008] In specific embodiments, the porous medium loaded with gel completely fills the tubular element within the enclosure. Alternatively, in other specific embodiments, the porous medium only partially fills the tubular element.

[0009] In a specific embodiment, the tubular element further comprises a second tubular element having longitudinal sides and proximal and distal ends, the second tubular element being longitudinally positioned within the first longitudinal channel formed by the wrap.

[0010] In a specific embodiment, the longitudinal sides of the second tubular element comprise paper or paperboard or cellulose acetate.

[0011] In a particular embodiment, the second tubular element comprises a porous medium loaded with a gel. However, in an alternative particular embodiment, the second tubular element comprises a gel.

[0012] In some specific embodiments, in the presence of a first tubular element and a second tubular element and a wrap as described above, the porous medium loaded with gel is positioned between the second tubular element and the wrap forming the first longitudinal passageway.

[0013] In some alternative embodiments, where a first tubular element and a second tubular element are present, the gel is positioned between the second tubular element and the wrapping that forms the at least one longitudinal passageway therebetween.

[0014] In combination with other features in particular embodiments, the tubular element includes a longitudinal element longitudinally positioned within the first longitudinal passageway.

[0015] In combination with other features in particular embodiments, the wrap is rigid.Alternatively or additionally, in particular embodiments, the longitudinal sides of the second tubular element are rigid.

[0016] In combination with other features in particular embodiments, the wrap is waterproof.

[0017] In conjunction with other features in particular embodiments, the tubular element further comprises a susceptor.

[0018] In a specific embodiment, the porous medium loaded with gel is corrugated. The porous medium may be corrugated before or after loading with gel.

[0019] In a specific embodiment, the porous medium loaded with the gel is shredded.The porous medium may be shredded before or after loading with the gel.

[0020] According to the present invention there is provided a method of manufacturing a tubular element as claimed in any preceding claim,

[0021] The method comprises the following steps:

[0022] - distributing a porous medium loaded with gel onto a web of wrapping material and distributing a second tubular element onto said porous medium loaded with gel on said web of wrapping material;

[0023] - wrapping said web of wrapping material around said porous medium loaded with gel and said second tubular element to form a composite structure of said porous medium loaded with gel and said second tubular element.

[0024] In a specific embodiment, the manufacturing method further comprises the step of cutting the wrapped composite structure of the porous medium loaded with gel and the second tubular element into a certain length.

[0025] According to the present invention, a tubular element is provided, wherein the tubular element comprises a first longitudinal channel and further comprises a thread loaded with a gel, wherein the gel comprises an active agent.

[0026] In a particular embodiment, there is a single line loaded with gel. However, in an alternative embodiment, there are multiple lines loaded with gel. Each line loaded with gel can have the same gel or a different gel.

[0027] In a specific embodiment, in combination with other features, the tubular element comprises a thread loaded with gel, preferably loaded with the same gel. Alternatively, in other specific embodiments, the tubular element comprises different gels. In a specific embodiment, the tubular element comprises a thread loaded with gel, wherein two different threads loaded with gel are loaded with different gels. In a specific embodiment, the tubular element comprises more than one gel.

[0028] In the manufacture of tubular elements, gel or porous media or wire may be dispensed simultaneously or sequentially when other components are dispensed. Preferably, the components are dispensed, but the components may be gathered or rolled or combined or positioned in any known manner to position them in the desired position.

[0029] In combination with other features, the tubular element includes a wrapping.

[0030] In a specific embodiment, in combination with other features, the tubular element comprises a susceptor adjacent to at least one gel-loaded thread. The susceptor may be thin and elongated. Preferably, the susceptor is longitudinally positioned within the tubular element. Preferably, the susceptor is surrounded by the gel-loaded thread. In an alternative embodiment, the susceptor is positioned between the inner surface of the wrapper and the gel-loaded thread. In a specific embodiment, the wrapper comprises the susceptor. Alternatively or additionally, the susceptor may be in the form of a powder, such as a metal powder. The powder may be in the gel, or in the wrapper, or spaced apart between the gel and the wrapper, or a combination thereof.

[0031] In combination with other features, in a specific embodiment, the tubular element further comprises a second tubular element.

[0032] According to the present invention, there is provided a method for manufacturing a tubular element,

[0033] The tubular element comprises:

[0034] - a first longitudinal channel, and the tubular element further comprises a thread loaded with a gel; the gel comprising an active agent;

[0035] The method comprises the following steps:

[0036] - placing material for the tubular element around a mandrel to form the tubular element;

[0037] The gel-loaded wire is dispensed from a catheter within the mandrel such that the gel-loaded wire is within the tubular element.

[0038] The tubular element may be cut to length. In a specific embodiment, the manufacture of the tubular element further comprises cutting the tubular element to length. The tubular element may be cut to length.

[0039] The manufacturing method may further comprise the step of extruding the material for the tubular element around a mandrel to form the tubular element.

[0040] The manufacturing method may further comprise the step of wrapping the tubular element with a wrap.

[0041] According to the present invention, there is provided a method for manufacturing a tubular element,

[0042] The tubular element comprises:

[0043] a wrap forming a first longitudinal passageway and further comprising a thread loaded with a gel; the gel comprising an active agent; and wherein

[0044] The method comprises the following steps:

[0045] - distributing the gel-loaded threads onto the web of wrapping material;

[0046] - Wrapping a web of wrapping material around the gel-loaded thread to form a wrapped composite structure of the gel-loaded thread.

[0047] In a specific embodiment, the method of manufacturing a tubular element further comprises the step of cutting the wrapped composite structure of the gel-loaded thread into a certain length.

[0048] According to the present invention, there is provided a method for manufacturing a tubular element,

[0049] The tubular element comprises:

[0050] - packaging;

[0051] - a thread loaded with a gel; the gel comprising an active agent; and

[0052] - a second tubular element;

[0053] The method comprises the following steps:

[0054] - distributing the gel-laden thread onto the web of wrapping material and distributing the second tubular element onto the gel-laden thread on the web of wrapping material;

[0055] - Wrapping a web of wrapping material around the gel-loaded wire and the second tubular element to form a wrapped composite structure of the gel-loaded wire and the second tubular element.

[0056] In a specific embodiment, the method of manufacturing a tubular element further comprises the step of cutting the wrapped composite structure of the gel-loaded wire and the second tubular element into lengths.

[0057] According to the present invention, there is provided a method for manufacturing a tubular element,

[0058] The tubular element comprises:

[0059] line; and

[0060] packaging; and

[0061] Also included is a gel, wherein the gel comprises an active agent;

[0062] The method comprises the following steps:

[0063] - dispensing lines on the web of wrapping material;

[0064] - dispensing the gel onto the wires on the web of wrapping material so that the gel impregnates or coats the wires and the wires are loaded with gel;

[0065] - wrapping a wrapping material around the gel-loaded wire to form a composite structure of the gel-loaded wire; and

[0066] - Cut the composite structure of gel loaded threads to length.

[0067] According to the present invention, there is provided a method of manufacturing a tubular element for use in an aerosol generating article,

[0068] The tubular element comprises:

[0069] - packaging;

[0070] - a second tubular element extending along the length of the tubular element;

[0071] a thread loaded with a gel positioned between said second tubular elements and extending along the hollow tubular element, wherein an additive is dispensed in the gel; and

[0072] - a wrap, which is wrapped around the gel-loaded wire and hollow tubular element,

[0073] The method comprises the following steps:

[0074] - Extruding the material for the hollow tubular element through a forming die and around a mandrel which forms a hollow core in the hollow tubular element;

[0075] - co-extruding the gel-loaded wire from a conduit in a forming die and around a hollow tubular element to form a composite core;

[0076] - placing the composite core along the web of wrapping material;

[0077] -Wrapping a wrap material around the composite core to form a wrapped composite structure.

[0078] In certain embodiments, the method of making a tubular element further comprises the step of cutting the composite structure into lengths.

[0079] The method of manufacturing a tubular element further comprises the step of dispensing a plurality of wires.

[0080] According to the present invention, there is provided a tubular element comprising a wrap forming a first longitudinal channel; the tubular element further comprising a gel; the gel comprising an active agent.

[0081] In specific embodiments, the gel completely fills the tubular element within the enclosure.

[0082] Alternatively, in specific embodiments, the gel may partially fill the tubular element. For example, in specific embodiments, the gel is provided as a coating on the inner surface of the tubular element. An advantage of only partially filling the tubular element is that it leaves a fluid path, for example, for aerosol to flow into or out of the tubular element.

[0083] In accordance with certain embodiments, the tubular element comprises a second tubular element.

[0084] In conjunction with a particular embodiment, the tubular element comprises a second tubular element comprising a longitudinal side and a proximal end and a distal end; and the second tubular element is longitudinally positioned within the first longitudinal passage.

[0085] In accordance with a specific embodiment, the tubular element comprises a plurality of second tubular elements.

[0086] In a specific embodiment, the tubular element comprises a plurality of second tubular elements arranged in parallel so as to extend along the longitudinal length of the tubular element. Optionally, a gel is provided in all, some or none of the plurality of second tubular elements. Again, depending on the specific embodiment, in the case of the presence of a gel in the second tubular element, the gel completely fills each of the plurality of second tubular elements, or the gel partially fills the second tubular element.

[0087] In specific embodiments, the tubular element comprises a porous medium loaded with a gel.

[0088] In combination with other features, in a specific embodiment, one or more of the second tubular elements comprises a porous medium loaded with gel. Where a porous medium loaded with gel is present, the porous medium loaded with gel completely fills each of the plurality of second tubular elements, or the porous medium loaded with gel partially fills the second tubular elements.

[0089] In a specific embodiment, the gel-loaded porous medium is located between the second tubular element and the wrap.

[0090] In a specific embodiment, the longitudinal sides of the second tubular element comprise paper or paperboard or cellulose acetate.

[0091] In a particular embodiment, the second tubular element comprises a gel.Preferably, the gel is at least partially enclosed by the longitudinal sides of the second tubular element.

[0092] In specific embodiments, the gel may be located between the second tubular element and the wrap forming the first longitudinal passageway.

[0093] In conjunction with particular embodiments, the outer diameter of the tubular element is approximately equal to the outer diameter of the aerosol-generating article.

[0094] In a specific embodiment, the outer diameter of the tubular element is between 5 mm and 12 mm, such as between 5 mm and 10 mm, or between 6 mm and 8 mm. Typically, the outer diameter of the tubular element is 7.2 mm plus or minus 10%.

[0095] Typically, the length of the tubular element is between 5 mm and 15 mm. Preferably, the length of the tubular element is between 6 mm and 12 mm, preferably, the length of the tubular element is between 7 mm and 10 mm, preferably, the length of the tubular element is 8 mm.

[0096] In connection with a particular embodiment, the gel is a mixture of materials capable of releasing volatile compounds, preferably when the gel is heated, into an aerosol passing through the tubular element. The provision of a gel may be advantageous to facilitate storage and transport, or during use, because the risk of leakage from the tubular element, aerosol-generating article or aerosol-generating device may be reduced.

[0097] Advantageously, the gel is solid at room temperature. "Solid" in this context means that the gel has a stable size and shape and does not flow. Room temperature in this context means 25 degrees Celsius.

[0098] The gel may include an aerosol former. Ideally, the aerosol former is substantially resistant to thermal degradation at the operating temperature of the tubular element. Suitable aerosol formers are well known in the art and include, but are not limited to: polyols such as triethylene glycol, 1,3-butylene glycol and glycerol; esters of polyols such as glycerol mono-, di- or triacetates; and fatty acid esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanoic acid. The polyol or mixture thereof may be one or more of triethylene glycol, 1,3-butylene glycol and glycerol or polyethylene glycol.

[0099] Advantageously, for example, the gel comprises a thermoreversible gel. This means that the gel becomes a fluid when heated to a melting temperature and becomes a gel again at a gelling temperature. The gelling temperature may be at or above room temperature and atmospheric pressure. Atmospheric pressure means 1 atmosphere of pressure. The melting temperature may be higher than the gelling temperature. The melting temperature of the gel may be higher than 50 degrees Celsius, or 60 degrees Celsius, or 70 degrees Celsius, and may be higher than 80 degrees Celsius. The melting temperature in this context means the temperature at which the gel is no longer solid and begins to flow.

[0100] Alternatively, in specific embodiments, the gel is a non-melting gel that does not melt during use of the tubular element. In these embodiments, the gel can release the active agent at least partially in use at a temperature that is at or above the operating temperature of the tubular element but below the melting temperature of the gel.

[0101] Preferably, the viscosity of the gel is from 50,000 to 10 Pascals per second, preferably from 10,000 to 1,000 Pascals per second, to obtain the desired viscosity.

[0102] Preferably, the gel comprises a gelling agent. The gelling agent may form a solid medium in which the aerosol former may be dispersed.

[0103] The gel may include any suitable gelling agent. For example, the gelling agent may include one or more biopolymers, such as two or three biopolymers. Preferably, when the gel includes more than one biopolymer, the biopolymers are present in substantially equal weights. The biopolymer may be formed by a polysaccharide. Biopolymers suitable for use as gelling agents include, for example, gellan gum (natural low acyl gellan gum, high acyl gellan gum, preferably low acyl gellan gum), xanthan gum, alginate (alginic acid), agar, guar gum, etc. Preferably, the gel includes agar.

[0104] The gel may include any suitable amount of gelling agent. For example, the gel includes the gelling agent in a range of about 0.5% to about 7% by weight of the gel. Preferably, the gel includes the gelling agent in a range of about 1% to about 5% by weight, such as about 1.5% to about 2.5% by weight.

[0105] In some preferred embodiments, the gel comprises agar in a range of about 0.5 wt % to about 7 wt %, or in a range of about 1 wt % to about 5 wt %, or about 2 wt %.

[0106] In some preferred embodiments, the gel comprises xanthan gum in the range of about 2 wt % to about 5 wt %, or in the range of about 2 wt % to about 4 wt %, or about 3 wt %.

[0107] In some preferred embodiments, gel comprises xanthan gum, gellan gum and agar.Gel can comprise xanthan gum, low acyl gellan gum and agar.Gel can comprise xanthan gum, gellan gum and agar of substantially equal weight.Gel can comprise xanthan gum, low acyl gellan gum and agar of substantially equal weight.Gel can comprise xanthan gum, low acyl gellan gum and agar, and its scope is about 1 % by weight to about 5 % by weight (for the total weight of described xanthan gum, low acyl gellan gum and agar), or in the scope of about 1 % by weight to about 4 % by weight or about 2 % by weight.Gel can comprise xanthan gum, low acyl gellan gum and agar, and its scope is about 1 % by weight to about 5 % by weight, or about 2 % by weight, and wherein the weight of xanthan gum, gellan gum and agar is substantially equal.

[0108] The gel can include divalent cations. Preferably, the divalent cation includes calcium ions, such as calcium lactate in the solution. Divalent cations (such as calcium ions) can help to form a gel comprising a composition of a biopolymer (polysaccharide) such as gellan gum (natural, low acyl gellan gum, high acyl gellan gum), xanthan gum, alginate (alginic acid), agar, guar gum, etc. Ionic effects can help gel formation. Divalent cations can be present in the gel composition with a scope of about 0.1 % by weight to about 1 % by weight or about 0.5 % by weight. In some embodiments, the gel does not include divalent cations.

[0109] The acid may comprise a carboxylic acid. The carboxylic acid may comprise a keto group. Preferably, the carboxylic acid comprises a keto group having less than 10 carbon atoms. Preferably, the carboxylic acid has five carbon atoms (e.g., peroxidic acid). Levulinic acid may be added to the neutralization pH of the gel. This may also help to form a gel comprising a composition of a biopolymer (polysaccharide) such as gellan gum (low acyl gellan gum, high acyl gellan gum), xanthan gum, especially alginate (alginic acid), agar, guar gum, etc. Levulinic acid may also enhance the sensory profile of the gel formulation. In some embodiments, the gel does not comprise a carboxylic acid.

[0110] In conjunction with specific embodiments, the gel comprises a gelling agent. In specific embodiments, the gel comprises agar or agarose or sodium alginate or gellan gum, or a mixture thereof.

[0111] In particular embodiments, the gel comprises water, e.g., the gel is a hydrogel. Alternatively, in particular embodiments, the gel is non-aqueous.

[0112] Preferably, the gel comprises an active agent. In conjunction with a specific embodiment, the active agent comprises nicotine (e.g., in powdered form or liquid form) or a tobacco product or another target compound, for example, for release in an aerosol. In a specific embodiment, nicotine is contained in a gel with an aerosol forming agent. It is desirable to lock nicotine into the gel at room temperature to prevent leakage.

[0113] In a specific embodiment, the gel is included in a solid tobacco material that releases flavor compounds when heated.Depending on the specific embodiment, the solid tobacco material is for example one or more of the following: powder, particle, ball, fragment (shred, silk), spaghetti-like, strip or sheet material, which contains one or more of the following: plant material, such as grass leaf, tobacco leaf, tobacco rib material, reconstituted tobacco, homogenized tobacco, extruded tobacco and expanded tobacco.

[0114] Alternatively or additionally, there are embodiments in which, for example, the gel comprises other flavors, such as menthol. Menthol may be added to the water or to the aerosol former prior to gel formation.

[0115] In embodiments where agar is used as a gelling agent, the gel comprises, for example, between 0.5 and 5 wt %, preferably between 0.8 and 1 wt %, of agar. Preferably, the gel also comprises between 0.1 and 2 wt % nicotine. Preferably, the gel also comprises between 30 and 90 wt % (or between 70 and 90 wt %) of glycerol. In specific embodiments, the remainder of the gel comprises water and flavorings.

[0116] Preferably, the gelling agent is agar, which has the property of melting at temperatures above 85 degrees Celsius and turning back into a gel at around 40 degrees Celsius. This property is suitable for hot environments. The gel does not melt at 50 degrees Celsius, which is useful, for example, if the system is left in a hot car in the sun. The phase change to liquid at around 85 degrees Celsius means that the gel only needs to be heated to a relatively low temperature to initiate aerosolization, thereby achieving low energy consumption. It may be beneficial to use only agarose instead of agar, which is one of the ingredients in agar.

[0117] When gellan gum is used as the gelling agent, the gel typically comprises between 0.5 wt% and 5 wt% gellan gum. Preferably, the gel also comprises between 0.1 wt% and 2 wt% nicotine. Preferably, the gel comprises between 30 wt% and 99.4 wt% glycerol. In a specific embodiment, the remainder of the gel comprises water and flavorings.

[0118] In one embodiment, the gel comprises 2% by weight nicotine, 70% by weight glycerin, 27% by weight water, and 1% by weight agar.

[0119] In another embodiment, the gel comprises 65 wt% glycerin, 20 wt% water, 14.3 wt% tobacco, and 0.7 wt% agar.

[0120] Additionally or alternatively, in some specific embodiments, the tubular element comprises a porous medium loaded with gel. Preferably, the porous medium loaded with gel is located between the second tubular element and the wrapper forming the first longitudinal passage. Alternatively, in some specific embodiments, the second tubular element comprises a porous medium loaded with gel. These embodiments do not necessarily exclude gel, or the porous medium loaded with gel is additionally or alternatively located elsewhere. In a specific embodiment, the tubular element comprises gel and a porous medium loaded with gel.

[0121] In combination with a particular embodiment, the tubular element comprises a longitudinal element positioned longitudinally within the first longitudinal channel. In a particular embodiment, the longitudinal element positioned longitudinally within the first longitudinal channel is a porous medium loaded with a gel. In other particular embodiments, the longitudinal element can be a longitudinal element of any material that can, for example, occupy space within the tubular element, or assist or contribute to the transfer of heat or material, or even contribute to the hardness or stiffness of the structure.

[0122] In some embodiments, the wrapper is hard or rigid to help the structure of the tubular element. It is foreseeable that the gel used in the present invention is a semisolid that can (especially in use) keep shape. However, the present invention is not limited to solid gels. Gels with more fluidity, gels with viscosity higher than solid gels can also be used together with embodiments of the present invention. It is therefore beneficial to have a wrapper that can keep the structure of the tubular element itself, but this is not necessary. Similarly, the longitudinal side of the second tubular element can be rigid or hard. The wrapper or longitudinal side with the second tubular element or both of the above--the wrapper and the longitudinal side of the second tubular element are hard or actually rigid--can help the structure of the tubular element, but can also help manufacture. Preferably, the thickness of the wrapper is about 50 to 150 microns.

[0123] In conjunction with other features, in a specific embodiment, the wrap is waterproof. In a specific embodiment, the longitudinal side of the second tubular element is waterproof. This waterproof property of the wrap or longitudinal side of the second tubular element can be achieved by using a waterproof material, or by treating the material of the wrap or longitudinal side of the second tubular element. This can be achieved by treating one or both sides of the wrap or longitudinal side of the second tubular element. Waterproofing will help not to lose structure, hardness or rigidity. This can also help prevent gel or liquid leakage, especially when using a gel of a fluid structure.

[0124] In connection with a specific embodiment, the tubular element comprises a susceptor. The susceptor can be any heat transfer material, for example, it can be a metal wire (e.g., an aluminum wire) or a wire comprising aluminum or a metal powder (such as, for example, aluminum powder). Typically, the susceptor is positioned longitudinally within the tubular element. The susceptor can be located in the gel, adjacent to the gel, or near the gel; or in the porous medium loaded with the gel, adjacent to the porous medium loaded with the gel, or near the porous medium loaded with the gel.

[0125] In conjunction with a specific embodiment, the tubular element further comprises a thread. This may be any material, natural or synthetic, but is preferably cotton. The thread may be a carrier for an active component, such as a flavor. An example of a suitable flavor for use in the present invention may be menthol. The thread may extend longitudinally within the tubular element. Preferably, the thread may be located within, adjacent to, or near the gel; or within, adjacent to, or near a porous medium loaded with gel.

[0126] In conjunction with specific embodiments, the tubular element further comprises a sheet. In conjunction with specific embodiments, the porous medium loaded with gel comprises a sheet. By providing the porous medium loaded with gel as a sheet, manufacturing advantages may be provided, for example, the sheets may be easily gathered together to form a suitable structure. The gel may be loaded into the sheet before being gathered together, or the gel may be loaded into the sheet after being gathered together.

[0127] According to the present invention, there is provided a tubular element comprising a wrap forming a first longitudinal passageway, the tubular element further comprising a porous medium loaded with a gel, the porous medium loaded with a gel further comprising an active agent.

[0128] In specific embodiments, the porous medium loaded with gel completely fills the tubular element within the enclosure. Alternatively, in other specific embodiments, the porous medium only partially fills the tubular element.

[0129] In a specific embodiment, the tubular element further comprises a second tubular element having longitudinal sides and proximal and distal ends, the second tubular element being longitudinally positioned within the first longitudinal passage formed by the wrap.

[0130] In a specific embodiment, the longitudinal sides of the second tubular element comprise paper or paperboard or cellulose acetate.

[0131] In specific embodiments, the second tubular element comprises a porous medium loaded with a gel.

[0132] In some embodiments, where there are first and second tubular elements as described, the gel-loaded porous medium is positioned between the second tubular element and the wrap forming the first longitudinal passageway.

[0133] In some alternative embodiments, where a first tubular element and a second tubular element are present, the gel is positioned between the second tubular element and the wrap forming the first longitudinal passageway.

[0134] According to the present invention, there is provided a method for manufacturing a tubular element,

[0135] The tubular element comprises:

[0136] - at least one longitudinal channel, and further comprising a gel; the gel comprising an active agent;

[0137] The method comprises the following steps:

[0138] - placing material for the tubular element around a mandrel forming the tubular element;

[0139] The gel is extruded from the catheter within the mandrel so that the gel is within the tubular element.

[0140] The method may further comprise the step of extruding material for the tubular element around a mandrel to form the tubular element.

[0141] The manufacturing method may further comprise the step of wrapping the tubular element with a wrap.

[0142] According to the present invention, there is provided a method for manufacturing a tubular element,

[0143] The tubular element comprises:

[0144] A wrapper forming a first longitudinal passageway and further comprising a porous medium loaded with a gel; the porous medium loaded with a gel further comprising an active agent; and wherein

[0145] The method comprises the following steps:

[0146] - distributing the porous medium loaded with gel onto a web of wrapping material; and,

[0147] -Wrapping the encapsulation material around the porous medium loaded with the gel.

[0148] According to the present invention, there is provided a method for manufacturing a tubular element,

[0149] The tubular element comprises:

[0150] - an enclosure forming a first longitudinal passageway and further comprising a porous medium loaded with a gel; a porous medium loaded with a gel and further comprising an active agent; and

[0151] - A second tubular element.

[0152] The method comprises the following steps:

[0153] - distributing a porous medium loaded with gel onto a web of wrapping material and distributing a second tubular element onto said porous medium loaded with gel on said web of wrapping material;

[0154] - Wrapping a wrapping material around the gel-loaded porous medium and the second tubular element.

[0155] In a specific embodiment, the method for manufacturing a tubular element further comprises the step of cutting the wrapped tubular element into a certain length.

[0156] It is envisioned that the tubular element of the present invention is used in an aerosol-generating article. It is also envisioned that the aerosol-generating article can be used in a device such as an aerosol-generating device. The aerosol-generating device can be used to hold and heat the aerosol-generating article to release material. In particular, this can be to release material from the tubular element of the present invention.

[0157] According to the present invention, there is provided an aerosol-generating article for generating an aerosol, the aerosol-generating article comprising:

[0158] - a fluid guide allowing fluid movement; a fluid guide having a proximal end and a distal end, the fluid guide having an inner longitudinal region and an outer longitudinal region separated by a barrier; wherein the inner longitudinal region contains an inner longitudinal channel between the distal end and the proximal end, and the outer region contains a longitudinal channel that transmits an external fluid to the distal end of the fluid guide through at least one hole, so that the external fluid can travel along the outer longitudinal channel to the distal end of the fluid guide;

[0159] - a tubular element comprising a gel; said gel comprising an active agent; said tubular element having a proximal end and a distal end and being located distally of said fluid guide.

[0160] In specific embodiments, the barrier separating the inner longitudinal channel and the outer longitudinal channel can be an impermeable barrier, for example, a fluid-impermeable barrier.

[0161] According to the present invention, there is provided an aerosol-generating article, the aerosol-generating article comprising:

[0162] - a fluid guide allowing fluid movement; the fluid guide has a proximal end and a distal end, the fluid guide has an inner longitudinal region and an outer longitudinal region separated by a barrier; wherein the inner longitudinal region contains an inner longitudinal channel between the distal end and the proximal end; and the outer region contains an outer longitudinal channel, which transmits an external fluid to the distal end of the fluid guide through at least one hole, so that the external fluid can travel along the outer longitudinal channel to the distal end of the fluid guide;

[0163] - a tubular element comprising a porous medium loaded with a gel and also comprising an active agent; said tubular element having a proximal end and a distal end and being located distal to said fluid guide.

[0164] Preferably, in some embodiments, the distal end of the tubular element comprises at least one hole. The hole at the distal end of the tubular element can allow a fluid (e.g., air from outside the aerosol-generating article) to enter and travel through the tubular element to generate an aerosol. The fluid traveling through the tubular element can pick up an active agent or any other material in the gel and transfer it from the gel through a downstream (proximal) direction.

[0165] In a specific embodiment, the aerosol generating article may include a cavity positioned between the distal end of the fluid guide and the proximal end of the tubular element. Thus, the cavity may be at the upstream end of the internal longitudinal passage and the downstream end of the tubular element. The cavity allows a fluid, such as ambient air, to travel through the external longitudinal passage to the cavity and contact the gel in the tubular element. The fluid in contact with the tubular element may enter and pass through the tubular element before returning to the internal longitudinal passage and the proximal end of the fluid guide and the proximal end of the aerosol generating article. When the fluid, such as ambient air, contacts the gel, the fluid may pick up an active agent or any other material in the gel or tubular element and transfer it along the downstream internal longitudinal passage to the proximal end of the aerosol generating article. In order to contact the gel, the ambient air may pass through the tubular element or through the gel or through the surface of the gel, or a combination thereof.

[0166] In a particular embodiment, the aerosol-generating article comprises a wrapper. For example, the wrapper may be any suitable material, for example, the wrapper may comprise paper. Preferably, the wrapper will have corresponding holes to the holes of the fluid guide. The corresponding holes of the fluid guide and the wrapper may result from holes formed after wrapping the article.

[0167] In a specific embodiment, at least one hole is located in the outer channel of the fluid guide.

[0168] Having at least one external communication hole in the outer passage of the fluid guide allows a distance between the tubular element and the at least one external communication hole. This can help prevent leakage of the gel and its contents, but also give the desired aerosol traction.

[0169] In a specific embodiment, at least one hole is located in the cavity between the fluid guide and the tubular element.

[0170] Having at least one hole in the outer passage of the fluid guide allows the ambient fluid to easily reach the tubular element and to easily mix in the cavity between the tubular element and the fluid guide.

[0171] In a particular embodiment, the at least one hole is located in the side wall of the tubular element.

[0172] Having the at least one hole in the sidewall of the tubular element allows the ambient fluid to travel substantially in one direction when negative pressure is applied to the proximal end of the aerosol-generating article. Having the at least one hole in the sidewall of the tubular element allows the ambient fluid to easily mix with the contents of the tubular element.

[0173] In a specific embodiment, the external longitudinal channel of the aerosol generating article comprises one or more holes. The hole can be any aperture, slit, hole or channel that allows a fluid (e.g., ambient air) to pass through and enter the aerosol generating article. This allows a fluid from outside the aerosol generating article to be inhaled. In use, this can be an external fluid, such as air, which is first inhaled into the aerosol generating article through the hole entering the external longitudinal channel before being inhaled into other parts of the aerosol generating article. In a specific embodiment, the holes are evenly spaced around the periphery of the aerosol generating article, for example, there are 10 or 12 holes. Having evenly spaced holes helps to provide smooth fluid flow.

[0174] In conjunction with a specific embodiment, the aerosol generating article comprises an end plug located at the distal end of the tubular element, and wherein the end plug has high resistance to suction. The end plug can be fluid-impermeable, or can be almost fluid-impermeable. Preferably, the end plug is located at the very distal end of the aerosol generating article. By having an end plug with high resistance to suction, this will advantageously bias the fluid to enter the hole through the external longitudinal channel when negative pressure is applied to the proximal end of the aerosol generating article. In some embodiments, the end plug is fluid-impermeable.

[0175] In some embodiments, the tubular element comprises an end plug. Advantageously, this allows for ease of manufacture. The end plug of the tubular element is preferably positioned at one end of the tubular element. Advantageously, this allows for ease of manufacture. In some embodiments, the tubular element comprises an end plug, wherein the end plug is fluid-impermeable. When the tubular element comprises a fluid-impermeable end plug, this prevents gel and other fluids from escaping from the tubular element through the end plug of the tubular element.

[0176] In a specific embodiment, the internal longitudinal passage of the internal area of ​​the fluid guide includes a restrictor. In some embodiments, the restrictor is located at or near the proximal end of the fluid guide. In some embodiments, the restrictor is located at or near the downstream end of the fluid guide. However, if present, the restrictor can be positioned in the middle area of ​​the internal longitudinal passage of the fluid guide or the middle area of ​​the external longitudinal passage. The restrictor can also be positioned at, near or at the distal end of the internal longitudinal passage. The restrictor can be positioned at or near the upstream end of the internal longitudinal passage. More than one restrictor can be used in the internal longitudinal passage of the fluid guide or in the external longitudinal passage.

[0177] The restrictor for some embodiments of the present invention comprises a sudden narrowing; just like a hole or gradual restriction in a surface such as a wall. Alternatively, in other embodiments, the restrictor comprises a gradual or smooth restriction, such as an inclined wall, or a funnel shape that narrows to an opening, or a stepwise restriction across the width of the channel. There may be a gradual or sudden widening on the downstream (proximal end) side of the restrictor. Specific embodiments include a funnel shape on one or both sides of the restrictor. Therefore, in the flow of the fluid, from upstream to downstream (distal to proximal), there may be a gradual flow restriction, such as the side of the channel narrowing to the opening of the restrictor, and then gradually widening the channel from the opening of the restrictor. Typically, the opening of the restrictor will have a restriction of 60% or 45% or 30% of the maximum cross-sectional area of ​​the channel. Therefore, in the present invention, for example, in some embodiments, the restrictor may comprise a narrowing, the cross-sectional area of ​​which is only 60% or 45% or 30% of the cross-sectional area of ​​the maximum or widest part of the internal longitudinal channel. Typically, embodiments of the present invention reduce the cross-sectional diameter of the cylindrical channel from, for example, 4 mm to 2.5 mm, or from 4 mm to 2.5 mm. Specific fluid flow characteristics can be achieved by varying different width reduction ratios and widths; the positioning of the restrictors; the number of restrictors; and the gradient of reduction and the gradient of widening.

[0178] In conjunction with a particular embodiment, the aerosol generating article comprises a heating element such as a susceptor so that heat can be transferred to the gel in the tubular element. As with the susceptor of the tubular element, this may be any suitable material, preferably a metal such as aluminium or aluminium containing metal.

[0179] According to the present invention, there is provided a method of manufacturing an aerosol-generating article, the aerosol-generating article comprising:

[0180] - a fluid guide allowing the transfer of a fluid; the fluid guide having a proximal end and a distal end, the fluid guide having an inner longitudinal region and an outer longitudinal region separated by a barrier; wherein the inner longitudinal region comprises an inner longitudinal channel between the distal end and the proximal end, and the outer region comprises an outer longitudinal channel, the outer longitudinal channel allowing the fluid to be transferred to the distal end of the fluid guide through the at least one hole, so that the fluid can travel along the outer longitudinal channel of the outer fluid control region to the distal end of the fluid guide;

[0181] - a tubular element comprising a gel; the gel comprising an active agent; the tubular element having a proximal end and a distal end; and,

[0182] The method comprises the following steps:

[0183] - linearly arranging tubular elements, containing the gel and the fluid guides on the web of wrapping material; and

[0184] - Wrapping the tubular element and the fluid guide and securely sealing the wrapping around the tubular element and the fluid guide.

[0185] According to the present invention, there is provided an aerosol generating device comprising a container configured to receive a distal end of an aerosol generating article as described herein.

[0186] The container of the device may correspond in shape and size to allow a close fit of the distal end or a portion of the distal end of the aerosol-generating article and to retain the aerosol-generating article in the container during normal use.

[0187] Typically, the container comprises a heating element. This will be capable of heating the aerosol-generating article; heating the tubular element; or heating the gel, preferably containing an active agent; or heating the porous medium loaded with the gel; or any combination thereof; directly or indirectly, assisting in the generation or release of the aerosol, or releasing the material into the aerosol. The aerosol can then pass through the proximal end of the aerosol-generating article. In specific embodiments, the heating is performed directly or indirectly by a thermal element or a susceptor or a combination of both.

[0188] The heating means may be any known heating means. Typically, the heating means may be by radiation or conduction or convection, or a combination thereof.

[0189] In conjunction with specific embodiments, the tubular element further comprises a thread. In specific embodiments, the thread is a natural material or a synthetic material, or the thread is a combination of natural and synthetic materials. The thread may comprise a semi-synthetic material. The thread may be made of fiber, or comprise fiber, or partially comprise fiber. The thread may be made of, for example, cotton, cellulose acetate, or paper. Composite threads may be used. The thread may help manufacture the tubular element comprising the active agent. The thread may help introduce the active agent into the tubular element comprising the active agent. The thread may help stabilize the structure of the tubular element comprising the active agent.

[0190] In conjunction with a specific embodiment, the tubular element comprises a porous medium loaded with a gel. The porous medium can be used within the tubular element to create a space within the tubular element. The porous medium is capable of holding or retaining the gel. This has the advantage of aiding the transfer and storage of the gel and the manufacture of the tubular element containing the gel. In the porous medium loaded with the gel, the gel may also contain an active agent; it may also contain or carry an active agent or other material.

[0191] The porous medium can be any suitable porous material capable of accommodating or retaining the gel. Ideally, the porous medium can move the gel therein. In a specific embodiment, the porous medium loaded with the gel comprises a natural material, a synthetic or semi-synthetic material, or a combination thereof. In a specific embodiment, the porous medium loaded with the gel comprises a sheet, a foam or a fiber, such as a loose fiber; or a combination thereof. In a specific embodiment, the porous medium loaded with the gel comprises a woven, non-woven or extruded material, or a combination thereof. Preferably, the porous medium loaded with the gel comprises, for example, cotton, paper, viscose, PLA or cellulose acetate or a combination thereof. Preferably, the porous medium loaded with the gel comprises a sheet, such as cotton or cellulose acetate. The advantage of the porous medium loaded with the gel is that the gel is retained in the porous medium, which can help manufacture, store or transport the gel. It can help maintain the desired gel shape, particularly during manufacture, transport or use. The porous medium used in the present invention can be wrinkled or shredded. In a specific embodiment, the porous medium comprises a wrinkled porous medium. In an alternative embodiment, the porous medium comprises a shredded porous medium. The wrinkling or mincing process can be done before or after loading with gel.

[0192] Mincing allows for a high surface area to volume ratio of the medium to enable easy absorption of the gel.

[0193] In a specific embodiment, the sheet is a composite material. Preferably, the sheet is porous. The sheet can help manufacture a tubular element comprising a gel. The sheet can help introduce an active agent into the tubular element comprising a gel. The sheet can contribute to stabilizing the structure of the tubular element comprising a gel. The sheet can assist in transporting or storing the gel. Using the sheet can achieve or contribute to adding a structure to a porous medium, such as by wrinkling the sheet. Wrinkling the sheet has the benefit of improving the structure to allow passages to pass through the structure. Passages passing through the curled sheet material contribute to loading the gel, holding the gel, and also contribute to fluid passing through the curled sheet material. Therefore, using a curled sheet material as a porous medium has advantages.

[0194] The porous medium may be a thread. The thread may comprise, for example, cotton, paper or acetate. The thread may also be loaded with gel, as any other porous medium. An advantage of using thread as a porous medium is that it may aid ease of manufacture. The thread may be pre-loaded with gel before being used to manufacture the tubular element, or the thread may be loaded with gel during assembly of the tubular element.

[0195] The wire can be loaded with gel by any known means. The wire can simply be coated with gel, or the wire can be impregnated with gel. In manufacture, the wire can be impregnated with gel and stored ready for inclusion in the assembly of tubular elements. In other processes, the wire undergoes a loading process during manufacture of tubular elements loaded with gel. As with the porous medium loaded with gel or just gel, preferably, the gel contains an active agent. The active agent is as described herein.

[0196] As used herein, the term "active agent" is an agent that is capable of having an activity, for example it produces a chemical reaction or is capable of changing the generated aerosol. The active agent may be more than one agent.

[0197] As used herein, the term "aerosol-generating article" is used to describe an article that is capable of generating or releasing an aerosol.

[0198] As used herein, the term "aerosol-generating device" is a device intended for use with an aerosol-generating article to enable the generation or release of an aerosol.

[0199] As used herein, the term "aerosol former" refers to any suitable known compound or mixture of compounds that promotes, in use, the enhancement of an initial aerosol received into a tubular element, for example, into a denser aerosol, a more stable aerosol, or both a denser aerosol and a more stable aerosol.

[0200] As used herein, the term "aerosol generating substance" is used to describe a substance that is capable of generating or releasing an aerosol.

[0201] As used herein, the term "aperture" is used to describe any hole, slit, aperture, or opening.

[0202] As used herein, the term "cavity" is used to describe any void or space that is at least partially enclosed in a structure. For example, in the present invention, a cavity is a partially enclosed space between a fluid guide and a tubular element (in some embodiments).

[0203] As used herein, the term "chamber" is used to describe a space or cavity that is at least partially enclosed.

[0204] For purposes of this disclosure, an internal longitudinal cross-sectional area that "contracts" from a first position to a second position is used to indicate a decrease in diameter of the internal longitudinal cross-sectional area from the first position to the second position. These are often referred to as "restrictors." Thus, as used herein, the term "restrictor" is used to describe a constriction in a fluid passage or a change in cross-sectional area in a fluid passage.

[0205] As used herein, the term "corrugated" refers to a material having a plurality of ridges or corrugations. It also encompasses the process of corrugating a material.

[0206] The expression "cross-sectional area" is used to describe the cross-sectional area measured in a plane transverse to the longitudinal direction.

[0207] For the purposes of this disclosure, as used herein, the term "diameter" or "width" is the largest transverse dimension of any of a tubular element, an aerosol-generating article or an aerosol-generating device, a portion thereof, a tubular element, an aerosol-generating article or an aerosol-generating device. For example, "diameter" is the diameter of an object with a circular transverse portion, or the length of the diagonal width of an object with a rectangular cross-section.

[0208] As used herein, the term "essential oil" is used to describe an oil having a characteristic odor and flavor obtained from a plant.

[0209] As used herein, the term "external fluid" is used to describe a fluid originating from outside an aerosol-generating element, article or device, such as ambient air.

[0210] As used herein, the term "flavor" is used to describe a composition that affects the sensory qualities of an aerosol.

[0211] As used herein, the term "fluid guide" is used to describe a device or component that can change the flow of a fluid. Preferably, this is a fluid flow path that directs or guides the generated or released aerosol. The fluid guide may cause the fluid to mix. It can help accelerate the fluid as the channel narrows in cross-sectional area, or it can help slow down the flow as it moves along the channel as the cross-sectional area of ​​the channel expands.

[0212] As used herein, the term "gathered" is used to describe a sheet that is rolled, folded or otherwise compressed or contracted generally transverse to the longitudinal axis of the aerosol-generating article or tubular element.

[0213] As used herein, the term "gel" is used to describe a solid, colloidal, semi-rigid material or mixture of materials having a three-dimensional network capable of holding other materials and capable of releasing the materials into an aerosol.

[0214] The term "herbal material" is used to indicate material that is derived from an herbaceous plant. "Herbs" are aromatic plants, where the leaves or other parts of the plant are used for medicinal, culinary or aromatic purposes and are capable of releasing a flavour into the aerosol generated by the aerosol-generating article.

[0215] The term "hydrophobicity" as used herein refers to a surface that exhibits the property of repelling water. Hydrophobic properties can be expressed by the water contact angle. The "water contact angle" is the angle through the liquid as conventionally measured when the liquid interface encounters the solid surface. It quantifies the wettability of a solid surface by a liquid via Young's equation.

[0216] As used herein, the term "impermeable" is used to describe an article, such as a barrier, that is not substantially or easily penetrated.

[0217] As used herein, the term "induction heating" is used to describe the heating of an object by electromagnetic induction, wherein eddy currents (also known as Foucault currents) are generated within the object to be heated, and electrical resistance results in resistive heating of the object.

[0218] As used herein, the term "longitudinal channel" is used to describe a channel or opening along which a liquid or the like flows. Typically, air or generated aerosol carries material, such as solid particles, along the longitudinal channel. Typically, the longitudinal channel will be longer in longitudinal length then width but not necessarily. The term "longitudinal channel" also encompasses a plurality of more than one longitudinal channel.

[0219] The term "longitudinal" is used to describe the direction between the proximal end and the distal end of a tubular element, an aerosol-generating article or an aerosol-generating device.

[0220] As used herein, "longitudinal side", such as the second tubular element, is used to describe the longitudinal side or wall of the second tubular element. In some embodiments, this is an integral part of, for example, the cellulose acetate or gel-loaded porous medium that forms the tubular element. In alternative embodiments, the longitudinal side is a wrap.

[0221] As used herein, the term "mandrel" is used to describe a shaft that is forged or formed from another material.

[0222] As used herein, the term "mint" is used to refer to plants of the mint family.

[0223] The term "mouthpiece" is used herein to describe an element, component or portion of an aerosol-generating article through which aerosol exits the aerosol-generating article.

[0224] As used herein, the term "external" used with reference to a fluid guide is used to describe a portion of the longitudinal periphery of the fluid guide that is further toward the fluid guide than the middle of the cross-sectional portion of the fluid guide. Similarly, the term "inner" is used to describe (with reference to a fluid guide) a portion of the fluid guide that is the center of the cross-sectional portion rather than near the periphery of the fluid guide.

[0225] As used herein, the term "channel" is used to describe a passageway that may allow access therebetween.

[0226] As used herein, the term "plasticizer" is used to describe a substance, usually a solvent, that adds or promotes plasticity or flexibility, and reduces brittleness.

[0227] As used herein, the term "porous medium" is used to describe any medium capable of holding, retaining or supporting a gel. Typically, a porous medium will have channels within its structure that can be filled to hold or retain a fluid or semi-solid, such as a gel. Preferably, the gel is also capable of being transferred or transferred along the channels within the porous medium. As used herein, the term "porous medium loaded with gel" is used to describe a porous medium containing a gel. A porous medium loaded with gel is capable of holding, retaining or supporting a certain amount of gel.

[0228] As used herein, the term "plug" is used to describe a component, section or element for an aerosol-generating article. As used herein, the term "end plug" is used to describe a distal-most end component at the distal end of an aerosol-generating article or a plug of an aerosol-generating article. Preferably, the end plug will have a high resistance to drawback (RTD).

[0229] The term "protogenic" refers to a group that is capable of donating a hydrogen or a proton in a chemical reaction.

[0230] By the term "container" of an aerosol-generating device, the term is used to describe the chamber of the aerosol-generating device that is capable of receiving a portion of an aerosol-generating article. This is typically the distal end of the article, but not necessarily.

[0231] As used herein, the term "resistance to suction" (RTD) is used to describe the resistance of a fluid, such as a gas, to being sucked through a material. As used herein, resistance to suction is expressed in pressure units "mm WG" or "millimeters of water gauge" and is measured according to ISO6565:2002.

[0232] As used herein, the term "high resistance to suction" (RTD) is used to describe the resistance of a fluid, such as a gas, to being sucked through a material, such as an end plug. As used herein, high resistance to suction means greater than 200 "Mm WG" or "Millimeter of Water Surface", and is measured according to ISO 6565:2002.

[0233] As used herein, the term "sheet" is used to describe a generally planar, laminar element whose width and length are substantially greater than its thickness.

[0234] As used herein, the term "sealing" is a joining or "engagement" made, for example, by joining the edges of the wrap to each other or to the fluid guide. This can be done by using an adhesive or glue. However, the term sealing also encompasses interference fit connections. Sealing does not require the creation of a liquid-impermeable seal or barrier.

[0235] As used herein, the term "minced" is used to describe something that is finely cut.

[0236] As used herein, the term "rigid" is used to describe an article that is sufficiently rigid, or hard enough, to resist change in shape, or sufficiently resistant to deforming shape under normal use. This includes that it may be resilient, so that if deformed, it can return to its original shape to a large extent. Likewise, the term "rigid" as used herein describes that the article resists bending or being forced out of shape, and is generally able to maintain its shape, especially under normal use.

[0237] As used herein, the term "susceptor" is used to describe a heating element, any material that can absorb electromagnetic energy and convert it into heat. For example, in the present invention, a susceptor or thermal element can help transfer thermal energy into a gel, heating the gel to help release material from the gel.

[0238] As used herein, the term "textured sheet" means a sheet that has been curled, embossed, debossed, perforated, or otherwise deformed.

[0239] As used herein, the term "gel-loaded thread" is used to describe a thread of porous medium that holds, retains or supports a gel, including, for example, being coated or impregnated with a gel.

[0240] In this document, the term "tubular element" is used to describe a component suitable for use in an aerosol generating article. Ideally, the tubular element may be longer in longitudinal length than it is wide, but this is not necessary, as it may be part of a multi-component article that ideally has a longer longitudinal length than it is wide. Typically, the tubular element is cylindrical, but this is not necessary. For example, the tubular element may have an elliptical, polygonal, like a triangle or rectangle, or irregular cross-section. The tubular element need not be hollow.

[0241] The terms "upstream" and "downstream" are used to describe relative positions relative to the direction of the mainstream fluid as it is drawn into a tubular element, an aerosol-generating article, or an aerosol-generating device. In some embodiments, where the fluid enters from the distal end of the aerosol-generating article and travels toward the proximal end of the article, the distal end of the aerosol-generating article may also be described as the upstream end of the aerosol-generating article and the proximal end of the aerosol-generating article may also be described as the downstream end of the aerosol-generating article. Elements of the aerosol-generating article located between the proximal end and the distal end may be described as being upstream of the distal end, or alternatively downstream of the distal end. However, in other embodiments of the present invention, where the fluid enters the aerosol-generating article from the side and first travels toward the distal end of the aerosol-generating article, turns and then travels toward the proximal end of the aerosol-generating article, the distal end of the aerosol-generating article may be upstream or downstream, depending on the respective reference points.

[0242] As used herein, the term "waterproof" is used to describe a material of the second tubular element, such as a wrap or a longitudinal side, that does not allow water to pass easily, or is not easily damaged by water. Waterproof materials are able to resist water penetration.

[0243] In a specific embodiment, the tubular element comprises an active agent. In a specific embodiment, the gel comprises an active agent. In a specific embodiment, the active agent comprises nicotine. In a specific embodiment, the gel or tubular element comprising an active agent comprises 0.2 wt % to 5 wt % of the active agent, such as 1 wt % to 2 wt % of the active agent.

[0244] Typically, in particular embodiments, the tubular element will contain at least 150 mg of gel.

[0245] In specific embodiments, the active agent comprises a plasticizer.

[0246] In a specific embodiment, the gel containing the active agent comprises an aerosol former, such as glycerol. In an embodiment of an aerosol prodrug containing an active agent, the gel containing the active agent comprises 60% to 95% by weight glycerol, such as 80% to 90% by weight glycerol.

[0247] In specific embodiments, the gel comprising the active agent comprises a gelling agent, such as alginate, gellan gum, guar, or a combination thereof. In embodiments comprising a gelling agent, the gel typically comprises 0.5 wt % to 10 wt % of the gelling agent, such as 1 wt % to 3 wt % of the gelling agent.

[0248] In particular embodiments, the gel comprises water. In such embodiments, the gel typically comprises between 5% and 25% by weight water, such as between 10% and 15% by weight water.

[0249] In certain embodiments, the active agent comprises a flavor or a drug substance or a combination thereof. In a specific example, the active agent is nicotine in any form. The active agent can be active, for example, can produce a chemical reaction or at least change the generated aerosol.

[0250] The active agent may be a flavor. In a specific embodiment, the active agent includes spices. The gel may include spices. Alternatively or in addition, spices may be present in one or more other locations of the product. Spices can impart flavor to contribute to the taste of the fluid or aerosol produced by the product. Spices are any natural or artificial compounds that affect the sensory quality of the aerosol. Plants that can be used to provide spices include but are not limited to those belonging to the following families: Lamiaceae (Lamiaceae) (e.g., mint), Apiaceae (Apiaceae) (e.g., anise, fennel), Lauraceae (Lauraceae) (e.g., laurel, cinnamon, rosewood), Rutaceae (Rutaceae) (e.g., citrus fruits), Myrtaceae (Myrtaceae) (e.g., anise myrtle) and Fabaceae (Fabaceae) (e.g., licorice). Non-limiting examples of spices sources include mint, such as mint and spearmint, coffee, tea, cinnamon, cloves, ginger, cocoa, vanilla, eucalyptus, geranium, agave and juniper; and combinations thereof.

[0251] Many spices are essential oils, or mixtures of one or more essential oils. Suitable essential oils include, but are not limited to, eugenol, peppermint oil, and spearmint oil. In many embodiments, flavorings include menthol, eugenol, or a combination of menthol and eugenol. In many embodiments, flavorings also include anethole, linalool, or a combination thereof. In a particular embodiment, flavorings include herbal materials. Herbal materials include herbal leaves or other herbal materials from herbaceous plants, and the herbaceous plants include, but are not limited to, mint (e.g., peppermint and spearmint), lemon balm, basil, cinnamon, lemon basil, chives, coriander, lavender, sage, tea, thyme, and caraway. Suitable types of mint leaves may be selected from plant species including, but not limited to, peppermint (Mentha piperita), field mint (Mentha arvensis), Egyptian mint (Menthaniliaca), lemon mint (Mentha citrata), spearmint (Mentha spicata), wrinkled spearmint (Mentha spicata crispa), heart-shaped mint (Mentha cordifolia), peppermint (Mentha longifolia), lip calyx mint (Mentha pulegium), apple mint (Mentha suaveolens), and variegated round-leaved mint (Mentha suaveolens variegata). In some embodiments, the flavorant may comprise a tobacco material.

[0252] In one specific example, in combination with other features, the gel comprises approximately 2% by weight nicotine, 70% by weight glycerin, 27% by weight water, and 1% by weight agar. In another embodiment, the gel comprises 65% by weight glycerin, 20% by weight water, 14.3% by weight solid powdered tobacco, and 0.7% by weight agar.

[0253] In the present invention, the fluid guide can have two different regions, for example an outer region with an outer longitudinal channel and an inner region with an inner longitudinal channel. Thus, the outer longitudinal channel is longitudinally close to the periphery of the fluid guide, and the inner fluid channel extends longitudinally to the cross section of the core along the longitudinal axis.

[0254] Preferably, in a particular embodiment, ambient air enters an outer longitudinal channel (fluid guide) at the distal end of the aerosol generating article through holes, in the wrapping and holes in the fluid guide, and in the area containing the tubular element, the gel contains the active agent. Preferably, the fluid will contact the gel containing the active agent to produce or release an aerosol containing a mixed liquid of the fluid from the outside of the aerosol, and the material released from the gel containing the active agent or agent. The fluid then travels along the inner longitudinal channel of the fluid guide toward the proximal end of the aerosol generating article. It is foreseen that the outer and inner longitudinal channels are separated by a barrier. The barrier may be impermeable to the fluid or resist fluid passing through it, so that the fluid can be biased to the distal end. Preferably, the outer longitudinal channel of the fluid guide contains holes that are fluidically connected to the external fluid of the fluid guide, as well as the outside of the article. It is also expected that the outer longitudinal channel is blocked at its proximal end so that in use, the fluid received from the outside of the aerosol generating article flows mainly toward the distal end of the fluid guide. The outer longitudinal channel of the fluid guide has a hole at or near the proximal end, but is only open at its distal end. In contrast, the inner longitudinal channel of the fluid guide is open at both its proximal and distal ends, but may have various flow restriction elements between its proximal and distal ends. The barrier separating the inner and outer longitudinal channels of the fluid guide forces the fluid entering the outer longitudinal channel to travel to the distal end of the outer longitudinal channel and toward the tubular element, which preferably contains a gel containing an active agent. This brings the fluid into contact with the tubular element, which preferably contains a gel containing an active agent.

[0255] The external longitudinal channel of the fluid guide can be one channel or more than one channel. The external longitudinal channel can be within the fluid guide, or can be one or more channels on the outer surface of the fluid guide, wherein the fluid guide forms part of the wall of the external longitudinal channel and the wrapping forms another part of the wall of the external longitudinal channel. The external or internal longitudinal channel of the fluid guide may contain a porous material such as a foam, in particular a reticulated foam, so that the channel passes through the porous material. In a specific embodiment, the fluid guide contains a porous material, such as a foam. The porous material can allow fluid to pass through while maintaining its shape. These materials are easy to shape and can therefore help to manufacture aerosol generating products.

[0256] In some embodiments, the outer longitudinal channel can extend substantially around the interior of the wrap. In some embodiments, the channel can extend less than the interior of the wrap.

[0257] Various aspects or embodiments of aerosol-generating articles for use with the aerosol-generating devices described herein may provide one or more advantages over currently available or previously described aerosol-generating articles. For example, an aerosol-generating article comprising a fluid guide and internal and external fluid passages of the fluid guide allows for efficient transfer of an aerosol generated from a tubular element comprising a gel that preferably contains an active agent. In addition, a gel containing an active agent is less likely to leak from an aerosol-generating article than a liquid element containing an active agent.

[0258] The aerosol-generating article may comprise a mouth end (proximal end); and a distal end. Preferably, the distal end is received by an aerosol-generating device having a heating element, the heating element being configured to heat the distal end of the aerosol-generating article. The tubular element comprising the gel, preferably comprising the active agent, is preferably disposed near the distal end of the aerosol-generating article. Thus, the aerosol-generating device may heat the tubular element comprising the gel, preferably comprising the active agent, in the aerosol-generating article to generate an aerosol comprising the active agent.

[0259] The aerosol-generating article or portion of the aerosol-generating article containing a tubular element (preferably containing a gel containing an active agent) can be a disposable aerosol-generating article or a multiple-use aerosol-generating article. In some specific embodiments, the parts of the aerosol-generating article are reusable and the parts are disposable after a single use. For example, the aerosol-generating article may include a reusable mouthpiece and a single-use portion containing a tubular element, wherein the tubular element contains a gel and an active agent, such as nicotine. In embodiments comprising both a reusable portion and a disposable portion, the reusable portion can be removed from the disposable portion.

[0260] In conjunction with a specific embodiment, the aerosol generating article comprises a wrapper. The aerosol generating article may have an open end, a proximal end, and a distal end, which may be open or closed in different specific embodiments. A tubular element, preferably comprising a gel containing an active agent (optionally comprising nicotine), is preferably disposed proximal to the distal end of the aerosol generating article. Applying a negative pressure to the open proximal end may release material from the tubular element, which preferably comprises a gel containing an active agent. The aerosol generating article defines at least one hole between the proximal end and the distal end. The at least one hole defines at least one fluid inlet, so that when a negative pressure is applied to the open proximal end of the aerosol generating article, a fluid, such as air, enters the aerosol generating article through the hole. Preferably, a fluid, such as ambient air, is drawn into the aerosol generating article through the hole, flows along the outer longitudinal channel of the fluid guide to the tubular element near the distal end of the aerosol generating article, and the tubular element preferably comprises a gel (the gel comprises an active agent). The fluid then flows from the distal end through the internal longitudinal passage of the fluid guide to the proximal end and out of the aerosol-generating article at the open proximal end.

[0261] By spacing the hole from the distal end of the aerosol generating article, the hole is separated from the tubular element containing the gel, thereby reducing the possibility of leakage of the gel through the hole. In addition, by providing an air flow channel from the hole to the tubular element containing the gel, such as an external longitudinal channel, the fluid from the hole can be directed toward the gel, and the fluid guide can act as another obstacle between the gel and the hole. The advantage of doing so is to further reduce the possibility of leakage of the tubular element through the hole. In addition, the internal longitudinal channel of the fluid guide provides a path for extracting, for example, air and fluids and materials generated or released from the tubular element from the aerosol generating article through the open proximal end. The path provided by the internal longitudinal channel of the fluid guide may have an internal longitudinal flow cross-sectional area that varies along the length of the internal longitudinal channel to change the flow of aerosol generated or released from the tubular element, from the distal end of the aerosol generating article, to the open proximal end of the aerosol generating article.

[0262] In conjunction with a specific embodiment, the aerosol generating article includes a fluid guide. The aerosol generating article and the fluid guide or parts thereof can be formed as a single part or as separate components. The advantage of the fluid guide and the aerosol generating article being formed as a single part as a whole is that only one part is manufactured instead of multiple parts, and then these multiple parts are subsequently assembled in the aerosol generating article. However, if the aerosol generating article is a multi-component structure requiring multiple components, this has the following advantages, namely that the different components can be more easily changed without changing the entire manufacturing process. Similarly, for the same reason, the fluid guide can be formed as a single part or as separate parts - if it is manufactured as a whole as one piece, it is easy to manufacture, but if the components of the fluid guide are assembled, it can be more easily adapted. The fluid guide is arranged in the aerosol generating article and has a proximal end, a distal end, and an internal longitudinal channel between the distal end and the proximal end.

[0263] The internal longitudinal passage of the fluid guide has an internal cross-sectional area.

[0264] Providing an opening or channel angled relative to the longitudinal direction of the aerosol generating article has the advantage that during use, the fluid is guided into the proximal end cavity at an angle with the flow of the mainstream fluid. This advantageously optimizes the mixing of the fluid and produces resistance to suction (RTD). Mixing can also increase the turbulence of the aerosol and air flow or the flow of the proximal end cavity. These effects on the flow dynamics of the mainstream produce aerosols that may enhance the above benefits. By changing the opening or channel dynamics, for example, by making the channel smaller or larger in cross-sectional area, or by changing the angle of the wall of the channel, or a combination thereof, the desired resistance to suction can be achieved. Such a channel, particularly when the channel is narrowed, is referred to as a restrictor or flow restriction element. According to the present invention, either the external and internal longitudinal channels can have a restrictor, but preferably only the internal longitudinal channel contains a restrictor. In order to help describe the different embodiments described below, therefore, only the fluid flow and direction of the channel are described, and only the internal longitudinal channel is described. However, the restrictor can also be used for the external longitudinal channel of the present invention, wherein the fluid flow is generally in the direction opposite to the internal longitudinal fluid flow path. The general flow path in the outer longitudinal channel is proximal end to distal, while in the inner longitudinal channel, the general flow direction in use is distal to proximal. The ventilation fluid passing through the aperture enters the aerosol-generating article and flows distally along the outer longitudinal channel. The fluid contacts the tubular element, which preferably contains a gel, which contains an active agent, and preferably generates or releases an aerosol containing the active agent, or other contents of the tubular element.

[0265] Restrictors have been provided in smoking articles and aerosol generating articles to compensate for low RTD (resistance to suction). For example, the restrictor may be embedded in a plug or tube of filter material. In addition, a filter segment containing a restrictor may be combined with other filter segments, which may optionally contain other additives, such as adsorbents or flavorings.

[0266] Preferably, in the cross-sectional area of ​​the restrictor, each channel extends along a radius of the cross-sectional area or along a line that deviates from the radius at an angle β (β). "Radius" refers to any line extending from the center of the cross-sectional area to the edge of the cross-sectional area. Angle β (β) is measured as the minimum angle between the radius and the central axis of the channel. In the case where the channel is not straight, the angle can be measured between the longitudinal axis of the filter and the outlet of the channel.

[0267] When viewing the cross-sectional area from a downstream direction (from the distal end to the proximal end for the internal longitudinal passage), the angle beta (β) can point in a clockwise or counterclockwise direction relative to the radius.

[0268] When the channels are offset from the radius, the angle beta (β) is preferably less than 60 degrees, more preferably less than 45 degrees, and most preferably less than 15 degrees in either the clockwise or counterclockwise direction. Where the angle beta (β) is offset from the radius, mixing of any fluid generated from the article and the ventilation fluid may be enhanced. In some cases, all channels may point in a clockwise or counterclockwise direction, or some channels may be directed in a clockwise direction and some of them may be directed in a counterclockwise direction.

[0269] The size of the opening or channel of the fluid guide preferably provides between 1.0 square millimeters and 4.0 square millimeters (mm 2 ) of the total opening area, more preferably 1.5 square millimeters and 3.5 square millimeters (mm 2 ). Preferably, the opening or passage of the inner longitudinal passage of the fluid guide is substantially circular, although other shapes of cross section are possible. An advantage of the inner longitudinal passage of the fluid guide being circular in cross section is that a more uniform fluid flow is possible compared to a passage with a non-circular cross section. Changing the shape of the passage allows achieving a desired flow.

[0270] A single opening or channel may be provided in the fluid guide. Alternatively, two or more spaced apart openings or channels may be provided in the fluid guide. For example, in some embodiments, a pair of substantially opposing channels are provided. Having more than one channel is advantageous to allow for increased control of the fluid flow through the channel. Having one channel is advantageous for ease of manufacture.

[0271] With respect to the inner longitudinal channel and the outer longitudinal channel where there are two or more openings or channels, the openings or channels may have opening areas that are identical to each other or different opening areas. It is advantageous to have equal opening areas for all identical areas of two or more channels so that the fluid can flow through all channels evenly. However, two or more than two channels with different opening areas are advantageous for generating turbulence of the fluid when the fluid passes through the two or more channels.

[0272] Two or more channels can be arranged at the same or different angles to the longitudinal axis. It is advantageous to have two or more channels at the same angle to the longitudinal axis so that the fluid can flow evenly through all channels. Generally, uniform flow of the fluid is easier to predict and design. It is advantageous to have two or more channels at different angles to the longitudinal axis so as to generate turbulence of the fluid when the fluid passes through the two or more channels. Generally, turbulent airflow can improve the agglomeration of particles to form aerosol droplets.

[0273] The two or more channels may be arranged at the same or different angles to the radius of the transverse cross section of the fluid guide. It is advantageous to have two or more channels at the same angle to the radius of the transverse cross section of the fluid guide area so that the fluid can flow evenly through all channels. It is advantageous to have two or more channels at different angles to the radius of the transverse cross section of the fluid guide to generate turbulence when the fluid passes through the two or more channels.

[0274] With respect to the inner longitudinal channel and the outer longitudinal channel where there are two or more channels, the channels can be located at substantially the same position along the length of the fluid guide, or at different longitudinal positions from each other. It is advantageous to have two or more channels at the same position along the length of the fluid guide so that the fluid can flow evenly through all the channels. It is advantageous to have two or more channels at different longitudinal positions from each other so as to create turbulence in the fluid as it passes through the two or more channels.

[0275] In embodiments where the aperture is disposed upstream of the cavity, an external longitudinal passage between the aperture and the cavity allows fluid to pass in a distal direction from the exterior of the aerosol-generating article to the cavity and the tubular element outside the cavity. The cavity may be partially enclosed by the wrapping of the aerosol-generating article. In such embodiments, mixing of a fluid, such as ambient air, with the generated or released aerosol may occur or partially occur before the aerosol passes through the restrictor.

[0276] Where the fluid guide comprises two or more restrictors of different sized cross-sectional areas, preferably the first upstream restrictor has the smallest cross-sectional area.Preferably, the first restrictor has a reduced outer diameter compared to the overall diameter of the internal longitudinal passage so as to form an annular passage between the distal and proximal sides.

[0277] In a specific embodiment, the restrictor is substantially spherical. However, alternative shapes are possible. The restrictor element may, for example, be substantially cylindrical or provided as a membrane. For example, the restrictor may be provided as a membrane extending in a plane perpendicular to the longitudinal axis of the article.

[0278] In an alternative design, the restrictor may be an aggregate of small particles (eg, microparticles held in place by a binder).

[0279] In conjunction with a specific embodiment, the cross-sectional area of ​​the internal longitudinal passage of the fluid guide is substantially constant from the distal end to the distal end of the proximal end. This achieves a smooth flow of the fluid. The inner diameter of the internal longitudinal passage of the fluid guide is generally in the range of 1 mm to 5 mm, generally about 2 mm. The internal longitudinal passage generally has an internal longitudinal cross-sectional area that is smaller than the cross-sectional area of ​​the cavity at the distal end of the fluid guide. Therefore, the fluid guide presents a contracted internal longitudinal cross-sectional area for accelerating air into the internal longitudinal passage at the distal end.

[0280] In conjunction with specific embodiments, the cross-sectional area of ​​the internal longitudinal passage changes from the distal end to the proximal end. This force forces the fluid to mix. For example, the cross-sectional area at the distal end of the internal longitudinal passage can be greater than the cross-sectional area at the proximal end of the internal longitudinal passage. When the cross-sectional area of ​​the internal longitudinal passage is greater at the distal end than at the distal end of the proximal end, the diameter of the internal longitudinal passage at the proximal end is preferably between 0.5 mm and 3 mm, for example, about 1 mm and the diameter of the internal longitudinal passage at the distal end is preferably between 1 mm and 5 mm, for example, about 2 mm.

[0281] In conjunction with a specific embodiment, the fluid guide is preferably 3 mm to 50 mm, and the length is preferably about 25 mm.

[0282] In combination with certain embodiments, the internal longitudinal channel of the fluid guide may have one or more portions arranged between the distal end and the proximal end, the one or more portions being adapted to change the fluid flow through the internal longitudinal channel from the distal end to the proximal end.

[0283] The internal longitudinal channel of the fluid guide may include a first portion between the proximal end and the distal end, the first portion being configured to accelerate the fluid as it flows from the distal end of the fluid guide toward the proximal end. The first portion of the internal longitudinal channel may be configured in any suitable manner to accelerate the fluid as it flows through the internal longitudinal channel from the distal end of the internal longitudinal channel toward the proximal end. For example, the first portion of the internal longitudinal channel may include a restrictor defining a restricted internal longitudinal cross-sectional area that forces the fluid to accelerate substantially axially from the distal end toward the proximal end. Preferably, the first portion of the internal longitudinal channel is the first portion of the internal longitudinal channel in a distal to proximal direction.

[0284] In conjunction with a specific embodiment, the internal longitudinal cross-sectional area of ​​the first portion of the internal longitudinal channel can be contracted from a position closer to the distal end of the fluid guide to a position closer to the proximal end of the fluid guide. The fluid is accelerated as it flows from the distal end to the proximal end. The internal longitudinal cross-sectional area of ​​the first portion can be constrained from the distal end of the first portion to the proximal end of the first portion. Therefore, the inner diameter of the distal end of the first portion of the internal longitudinal channel (closer to the distal end of the fluid guide) can have a larger inner diameter than the proximal end of the first portion (the position closer to the proximal end of the fluid guide).

[0285] In conjunction with specific embodiments, the internal longitudinal cross-section of the first portion of the internal longitudinal passage can be substantially constant from the distal end of the first portion to the proximal end of the first portion. In such embodiments, the constant internal longitudinal cross-sectional area of ​​the first portion of the internal longitudinal passage can be less than the internal longitudinal cross-sectional area at the distal end of the internal longitudinal passage.

[0286] In the case where the inner longitudinal channel of the fluid guide narrows from the distal end to the proximal end, the narrowing of the inner longitudinal channel typically comprises a gradual reduction in the cross-sectional area of ​​the inner longitudinal channel from the distal end to the proximal end of the fluid guide. Preferably, the reduction in the diameter of the inner longitudinal channel is linear, such as a frustoconical shape, from the distal end to the proximal end of the first portion. A linear reduction in cross-sectional area, such as a frustoconical shape, is conducive to generating a smooth flow of the fluid through the fluid guide.

[0287] Alternatively, the contraction is non-uniform. For example, in a specific embodiment, the contraction of the inner longitudinal passage is stepped, with the cross-sectional area of ​​the inner longitudinal passage increasing in discrete increments or steps from the distal end to the proximal end. The non-uniform reduction in the cross-sectional area of ​​the inner longitudinal passage is beneficial for generating turbulent flow of the fluid as it passes along the fluid guide.

[0288] The internal longitudinal passage of the fluid guide may include a second portion between the proximal end and the distal end, the second portion being configured to decelerate the fluid as it flows from the distal end toward the proximal end of the fluid guide. The second portion of the internal longitudinal passage may be configured in any suitable manner to decelerate the fluid as it flows through the internal longitudinal passage from the distal end toward the proximal end of the internal longitudinal passage. For example, the first portion of the internal longitudinal passage may include a guide defining an expanded internal longitudinal cross-sectional area that forces the fluid to decelerate substantially in an axial direction from the distal end to the proximal end. Preferably, the second portion of the internal longitudinal passage is after the first portion in the distal to proximal direction.

[0289] In conjunction with certain embodiments, the internal longitudinal cross-sectional area of ​​the first portion of the internal longitudinal passage can expand from a position closer to the distal end of the fluid guide to a position closer to the proximal end of the fluid guide. The fluid decelerates as it flows from the distal end to the proximal end. The internal longitudinal cross-sectional area of ​​the first portion can expand from the distal end of the second portion to the proximal end of the second portion of the fluid guide. Thus, the distal end of the second portion of the internal longitudinal passage (a position closer to the distal end of the fluid guide) can have a smaller inner diameter than the proximal end of the second portion (a position closer to the proximal end of the fluid guide).

[0290] In conjunction with specific embodiments, the cross-sectional area of ​​the second portion of the internal longitudinal passage can be constant from the distal end of the second portion to the proximal end of the second portion. In such embodiments, the area of ​​the constant cross-sectional area of ​​the second portion of the internal longitudinal passage can be greater than the area of ​​the cross-sectional area at the distal end of the second portion of the internal longitudinal passage.

[0291] In the case where the cross-section of the internal longitudinal channel of the fluid guide expands from the distal end to the proximal end, the cross-sectional expansion of the internal longitudinal channel generally comprises a gradual expansion of the cross-sectional area of ​​the internal longitudinal channel from the distal end of the second part to the proximal end of the fluid guide. Preferably, the expansion of the diameter of the internal longitudinal channel can be linear from the distal end of the proximal end of the second part, such as a frustoconical shape. A linear reduction in cross-sectional area, such as a frustoconical shape, is conducive to generating a smooth flow of fluid through the fluid guide.

[0292] Alternatively, the contraction is non-uniform. For example, in certain embodiments, the expansion of the inner longitudinal passage is step-wise, with the cross-sectional area of ​​the inner longitudinal passage contracting in discrete increments or steps from the distal end to the proximal end. The non-uniform reduction in the cross-sectional area of ​​the inner longitudinal passage is advantageous for generating turbulent flow of the fluid as it passes along the fluid guide.

[0293] The diameter of the proximal end of the inner longitudinal channel is typically between 0.5 mm and 3 mm, such as 0.8 mm, 1 mm, or preferably 1.2 mm.

[0294] The diameter of the distal end of the inner longitudinal passage is typically between 1 mm and 5 mm, such as 1.2 mm, 2 mm, or preferably 2.2 mm.

[0295] The ratio of the diameter of the proximal end of the inner longitudinal channel to the diameter of the distal end of the inner longitudinal channel is typically between 1:4 and 3:4, or between 2:5 and 3:5, or preferably 1:2.

[0296] The distance between the proximal end and the distal end of the internal longitudinal passage can be any suitable distance.For example, the length of the internal longitudinal passage is typically 3 mm to 15 mm, for example 4 mm to 7 mm, or preferably 5.2 mm to 5.8 mm.

[0297] In particular embodiments of the invention, the fluid guide may be modular, comprising two or more segments forming the fluid guide.

[0298] In conjunction with specific embodiments, the aerosol-generating article comprises at least one external longitudinal channel in communication with the aperture of the wrapper. In conjunction with specific embodiments, the channel is at least partially formed by the wrapper, wherein the wrapper is present. The channel directs a fluid (e.g., ambient air) from the aperture toward the tubular element containing the active agent. In specific embodiments, the external longitudinal channel is formed on the exterior of the fluid guide beneath the inner surface of the wrapper.

[0299] The aerosol-generating article may comprise more than one external longitudinal channel. In a specific embodiment, the aerosol-generating article comprises 2 to 20 external longitudinal channels in the exterior of the fluid guide. For example, the article may comprise 6 to 14 external longitudinal channels, typically 10 to 12 channels. Different numbers of channels allow for different aerosol flow dynamics.

[0300] Preferably, each external longitudinal channel is in communication with at least one aperture through the wrapper. However, the aerosol-generating article may comprise one or more external longitudinal channels which are not in direct communication with an aperture. Preferably, each external longitudinal channel is in communication with at least one aperture through the outer wall of the fluid guide. Where present, preferably, the aperture through the wrapper and the aperture through the outer wall of the fluid guide are aligned with each other and at least one external longitudinal channel so as to allow fluid to flow into the aerosol-generating article and along the external longitudinal channel towards the distal end of the aerosol-generating article.

[0301] Preferably, the outer longitudinal channel and the wrapping contain more than one hole. For example, in conjunction with a specific embodiment, the outer longitudinal channel and the wrapping contain between 2 and 20 holes. Preferably, the number of holes is equal to the number of outer longitudinal channels, and each hole corresponds to a separate outer longitudinal channel. Preferably, the holes are evenly spaced and arranged circumferentially around the article to evenly assist in the distribution of the fluid.

[0302] In conjunction with a specific embodiment, the sidewalls of the outer longitudinal channel extend along at least a portion of the longitudinal length of the aerosol-generating article between the exterior of the fluid guide and the interior of the wrapper. For example, in a specific embodiment, the fluid guide has longitudinal blades that, with the presence of the wrapper, form an outer longitudinal channel.

[0303] In accordance with a specific embodiment, the outer longitudinal channel extends completely around the interior of the wrap. Alternatively, the outer longitudinal channel extends less than all around the periphery of the fluid guide, such as less than 90% around the periphery of the fluid guide, less than 70% around the periphery of the fluid guide, or less than 50% around the periphery of the fluid guide. In a specific embodiment, the outer longitudinal channel extends at least 5% around the periphery of the fluid guide.

[0304] In conjunction with a specific embodiment, the distal end of the outer longitudinal channel is spaced apart from the distal end of the aerosol-generating article. Alternatively, in other specific embodiments, the distal end of the outer longitudinal channel is equal to the distal end of the fluid guide. In conjunction with a specific embodiment, the distal end of the outer longitudinal channel can be 2 mm to 20 mm from the distal end of the aerosol-generating article, for example 10 mm and 12 mm from the distal end of the aerosol-generating article.

[0305] In connection with a specific embodiment, the width of the outer longitudinal channel is, for example, between 0.5 mm and 2 mm, typically between 0.75 mm and 1.8 mm.

[0306] The distal end of the longitudinal channel can be located a distance from the distal end of the aerosol generating article so that the fluid entering the aperture of the outer longitudinal channel can contact the tubular element and can generate or release an aerosol from the gel. The aerosol generated or released at the tubular element can pass through the inner longitudinal channel of the fluid guide to the proximal end of the aerosol generating article.

[0307] Preferably, at least 5% of the fluid flowing through the aerosol-generating article contacts the tubular element and the gel, preferably comprising the active agent. More preferably, at least 25% of the air flowing through the article contacts the tubular element comprising the active agent.

[0308] In particular embodiments, not all fluid will contact the tubular element, for example, at least 5% of the fluid flowing through the aerosol-generating article will not contact the tubular element, although in other specific embodiments this may be at least 10% of the fluid flowing through the aerosol-generating article.

[0309] In accordance with a specific embodiment, the distal end of the fluid guide is spaced apart from the distal end of the aerosol generating article. In accordance with a specific embodiment, the distal end of the fluid guide may be 2 mm to 20 mm away from the distal end of the aerosol generating article, for example 7 mm to 17 mm away from the distal end of the aerosol generating article, preferably 12 mm to 16 mm away from the distal end of the aerosol generating article.

[0310] Preferably, the aerosol-generating article is generally cylindrical. This facilitates smooth flow of the aerosol. The aerosol-generating article may have an outer diameter of, for example, between 4 mm and 15 mm, between 5 mm and 10 mm, or between 6 mm and 8 mm. The aerosol-generating article may have a length of, for example, between 10 mm and 60 mm, between 15 mm and 50 mm, or between 20 mm and 45 mm.

[0311] The resistance to suction (RTD) of the aerosol-generating article will vary depending on the length and size of the channel, the size of the hole, the size of the narrowest cross-sectional area of ​​the internal channel, and the materials used. In a specific embodiment, the RTD of the aerosol-generating article is between 50 mm per water and 140 mm per water (mm H2O), between 60 mm per water and 120 mm per water (mm H2O), or between 80 mm per water and 100 mm per water (mm H2O). The RTD of the article refers to the static pressure difference between one or more holes of the article and the mouth end of the article when the article is passed through the internal longitudinal channel under stable conditions, and the volume flow rate at the mouth end under the stable conditions is 17.5 ml / sec. The RTD of the sample can be measured using the method specified in ISO standard 6565:2002.

[0312] Preferably, the aerosol generating article according to the present invention comprises holes at positions along the outer longitudinal channel. Therefore, the holes are located at a position upstream of the restrictor. In a specific embodiment, the holes will be provided as a row or rows of holes through a wrapper, or a fluid guide, or both a fluid guide and a wrapper, and allow the fluid to be sucked into the aerosol generating article. Before passing along the internal longitudinal channel and passing through the restrictor (if present in this embodiment), the fluid is first sucked out of the hole, then sucked out of the external longitudinal channel, and then directed to the distal end of the aerosol generating article, where the fluid can contact with the tubular element, preferably with the gel in the tubular element, preferably with the gel containing the active agent. Preferably, the total internal path of the fluid from the hole to the proximal end of the aerosol generating article is at least 9 mm. More preferably at least 10 mm, so as to provide optimal aerosol formation in terms of resistance to suction and cooling effect.

[0313] By adjusting the number and size of the holes, the amount of fluid entering the aerosol generating article can be tailored according to the stretching. For example, one or two rows of holes can be formed by the wrapper to allow the fluid to easily flow into the aerosol generating article. In alternative embodiments, the wrapper contains fewer holes, such as 2 or 4. The pore size and the number of pores will affect the flow of fluid into the aerosol generating article. Different combinations of resistance to draw (RTD) and fluid flow into the aerosol generating article can cause different aerosol formations, and therefore the aerosol generating article according to the present invention provides a wider range of design options.

[0314] In particular embodiments, the aerosol-generating article comprises a plastic material, a metal material, a cellulosic material (such as cellulose acetate), paper, paperboard, cotton, or a combination thereof.

[0315] In certain embodiments, the fluid guide comprises a plastic material, a metal material, a cellulosic material (such as cellulose acetate), paper, paperboard, or a combination thereof.

[0316] In conjunction with specific embodiments, the wrapper comprises more than one material. In specific embodiments, the wrapper or a portion thereof comprises a metal material, a plastic material, cardboard, paper, cotton, or a combination thereof. When the wrapper comprises cardboard or paper, the holes can be formed by laser cutting.

[0317] The wrapping provides strength and structural rigidity to the aerosol generating article. When paper or paperboard is used for the wrapping paper and a high degree of rigidity is required, it preferably has a basis weight greater than 60 grams per square meter. One such wrapping can provide higher structural rigidity. The wrapping can resist deformation on the outside of the aerosol generating article at a position where the restrictor (if present) is embedded in the aerosol generating article or in other positions (for example, in a cavity (if present) where there is less structural support). In some embodiments, the tubular element wrapping comprises a metal layer. The metal layer can be used to concentrate externally applied energy to heat the tubular member, for example, the metal layer can act as a receiver of an electromagnetic field or collect radiant energy provided by an external heat source. If there is an internal heat source, the metal layer can prevent heat from leaving the tubular element through the wrapping, thereby improving the heating efficiency. It can also provide uniform heat distribution along the periphery of the tubular member.

[0318] In a particular embodiment, the aerosol-generating article comprises a seal between the exterior of the fluid guide and the interior of the wrapper. The wrapper can then be securely attached to the fluid guide. It need not create a fluid-impermeable seal.

[0319] In a specific embodiment, the aerosol generating article comprises a mouthpiece. The mouthpiece may comprise a fluid guide or a portion thereof and may form at least a proximal portion of a wrapper of the aerosol generating article. The mouthpiece may be connected to the wrapper or a distal portion of the wrapper in any suitable manner, such as by an interference fit, a threaded engagement, etc. The mouthpiece may be a portion of the aerosol generating article that may comprise a filter, or in some cases, the mouthpiece may be defined by the extent of the tipping paper (if present). In other embodiments, the mouthpiece may be defined as a portion of the article that extends 40 mm from the mouth end of the aerosol generating article, or 30 mm from the mouth end of the aerosol generating article.

[0320] The tubular element, preferably comprising a gel comprising an active agent, may be positioned proximal to the distal end of the aerosol-generating article prior to final assembly of the aerosol-generating article.

[0321] Once fully assembled, the aerosol-generating article defines a fluid path through which a fluid can flow. When negative pressure is provided at the mouth end (proximal end) of the aerosol-generating article, the fluid enters the aerosol-generating article through the hole in the wrapper (or the fluid guide, or both), and then flows through the external longitudinal channel toward the distal end of the aerosol-generating article. It may entrain aerosol, optionally generated by heating a tubular element containing an active agent. The fluid entrained with aerosol can then flow through the internal longitudinal channel of the fluid guide and through the open mouth end of the aerosol-generating article.

[0322] Preferably, the aerosol-generating article is configured to be received by the aerosol-generating device so that the heating element of the aerosol-generating device can heat the portion of the aerosol-generating article that contains the tubular element. For example, if the tubular element preferably contains a gel containing an active agent, the tubular element can be the distal end of the aerosol-generating article, the tubular element being disposed at or near the distal end of the aerosol-generating article.

[0323] Preferably, the shape and size of the aerosol generating article can be used with an aerosol generating device of appropriate, corresponding shape and size, which device comprises a container for containing the aerosol generating article and a heating element, which is constructed and positioned to heat a section of the aerosol generating article comprising the following components: preferably a tubular element comprising a gel containing an active agent.

[0324] The aerosol generating device preferably comprises control electronics operably coupled to the heating element. The control electronics may be configured to control the heating of the heating element. The control electronics may be internal to the housing of the device.

[0325] The control electronics may be provided in any suitable form and may, for example, include a controller or a memory and a controller. The controller may include one or more of: an Application Specific Integrated Circuit (ASIC) state machine, a digital signal processor, a gate array, a microprocessor, or an equivalent discrete or integrated logic circuit. The control electronics may include a memory containing instructions that cause one or more components of the circuit to implement functions or aspects of the control electronics. Functionality attributable to the control electronics in the present disclosure may be embodied as one or more of software, firmware, and hardware.

[0326] The electronic circuit may comprise a microprocessor, which may be a programmable microprocessor. The electronic circuit may be configured to regulate the power supply to the heating element. The power may be supplied to the heating element in the form of current pulses. The control electronics may be configured to monitor the resistance of the heating element and control the power supply to the heating element depending on the resistance of the heating element. In this way, the control electronics may regulate the temperature of the resistive element.

[0327] The aerosol generating device may include a temperature sensor, such as a thermocouple, operably coupled to the control electronics to control the temperature of the heating element. The temperature sensor may be positioned in any suitable location. For example, the temperature sensor may be in contact with or close to the heating element. The sensor may send a signal about the sensed temperature to the control electronics, which may adjust the heating of the heating element to achieve a suitable temperature at the sensor.

[0328] Whether or not the aerosol generating device comprises a temperature sensor, the device may be configured to heat the tubular element, which preferably comprises a gel containing the active agent in the aerosol generating article, to an extent sufficient to generate an aerosol.

[0329] The control electronics may be operably coupled to a power source, which may be internal to the housing. The aerosol generating device may comprise any suitable power source. For example, the power source for the aerosol generating device may be a battery or a battery pack. The battery or power supply unit may be rechargeable, as well as removable and replaceable.

[0330] In conjunction with a specific embodiment, the heating element comprises a resistive heating component, such as one or more resistive wires or other resistive elements. The resistive wire may be in contact with a thermally conductive material to distribute the generated heat over a wider area. Examples of suitable conductive materials include gold, aluminum, copper, zinc, nickel, silver, and combinations thereof. Preferably, if the resistive wire is in contact with the thermally conductive material, both the resistive wire and the thermally conductive material are part of the heating element.

[0331] In conjunction with a specific embodiment, the heating element comprises a cavity configured to receive and surround the distal end of the article. The heating element may comprise an elongated element configured to extend along the side of the housing of the article when the distal end of the article is received by the device.

[0332] Alternatively, to insert the heating element into the aerosol-generating article, heat may be applied externally to the tubular element using a heat jacket that is thermally coupled around the wrapping of the aerosol-generating article.Preferably, the jacket is located in the portion of the aerosol-generating article that contains the tubular element.

[0333] In other specific embodiments, the heating element comprises inductive heating.

[0334] In a particular embodiment, the tubular element preferably comprises a gel, preferably comprising an active agent, which is heated by induction heating.

[0335] Preferably, the portion of the aerosol-generating article comprising the tubular element is positioned in the aerosol-generating device such that the one or more heating elements generating electromagnetic radiation for inductive heating are proximate to the portion of the aerosol-generating article comprising the tubular element. Thus, preferably, when positioned in the aerosol-generating device, the heating element of the aerosol-generating device is proximate to the gel within the aerosol-generating article.

[0336] Preferably, in embodiments for inductive heating, the aerosol-generating article comprises a susceptor. Preferably, in embodiments for inductive heating, the tubular element comprises a susceptor. Further preferably, in certain embodiments, the gel comprises a susceptor. Preferably, the susceptor is in contact with or in proximity to the gel. Thus, in such embodiments of the invention, upon heating the susceptor by radiation, heat transfer can be readily applied to the gel, releasing material, such as an active agent, from the gel.

[0337] Additionally or alternatively, in combination with other features of the invention, the porous medium loaded with gel comprises a susceptor.Thus, the susceptor can be in contact with the porous medium loaded with gel and allow easy heating of the porous medium loaded with gel.

[0338] In a specific embodiment, the gel within the tubular element may be initially separated from the aerosol received into the tubular element and may be released to be entrained into the aerosol in response to rupture of the frangible partitions. Optionally, in a specific embodiment, in use, multiple portions of the gel may be sealed on corresponding frangible partitions and an appropriate number of frangible partitions may need to be ruptured to achieve a desired level of active agent in the aerosol received into the tubular element into the aerosol.

[0339] In conjunction with specific embodiments, an aerosol generating device may be configured to receive more than one aerosol generating article as described herein. For example, an aerosol generating device may include a receptacle into which an elongated heating element extends. One aerosol generating article may be contained in a receptacle on one side of the heating element, and another aerosol generating article may be contained in a receptacle on the other side of the heating element. Or in other specific embodiments, the aerosol generating device includes more than one receptor. Thus, more than one aerosol generating article may be contained at one time.

[0340] In conjunction with specific embodiments of the present invention, the wrap or a portion of the wrap is waterproof or hydrophobic, thereby having a certain degree of water resistance, or the property of resisting moisture penetration. This can be a wrap of the tubular element, or a wrap of the aerosol generating article, or a wrap of both the tubular element and the aerosol generating article. It can also be a wrap of any other part of the aerosol generating article, or any other component of the aerosol generating article, including the longitudinal side of the second tubular element within the first tubular element. The wrap can be naturally impermeable, thereby resisting water or moisture penetration. The wrap can be multi-layered, having a barrier that prevents or reduces the passage of water, or at least resists the penetration of water or moisture. The hydrophobic barrier or hydrophobic treatment of the wrap used in conjunction with a specific embodiment can be over the entire area of ​​the wrap. Alternatively, in other specific embodiments, the hydrophobic barrier or treatment of the wrap is a part of the wrap, for example, this can be one side of the wrap, the inside or outside of the wrap; or it can be treated on both sides of the wrap.

[0341] The hydrophobic region of the wrap can be prepared by a method comprising the steps of applying a liquid composition comprising a fatty acid halide to at least one surface of the wrap and maintaining the surface for about 5 minutes at a temperature of 120 degrees C to 180 degrees C. The fatty acid halide reacts in situ with the protogenic groups of the material in the wrap, resulting in the formation of fatty acid esters, thereby imparting hydrophobic properties and resistance to moisture penetration.

[0342] It is expected that the hydrophobically treated coating can reduce or prevent the absorption or transfer of water, moisture or liquid to or from the coating agent. Advantageously, the hydrophobically treated coating does not negatively affect the taste of the product.

[0343] In certain embodiments, the wrapper in use typically forms the exterior of the aerosol generating article. In specific embodiments, the wrapper comprises: paper, homogenized paper, homogenized tobacco impregnated paper, homogenized tobacco, wood pulp, flax, straw, sedge, eucalyptus, cotton, etc. In specific embodiments, the substrate or paper forming the wrapper has a basis weight of the substrate or paper forming the wrapper in the range of 10 to 50 grams per square meter, such as 15 to 45 grams per square meter. In conjunction with specific embodiments, the thickness of the substrate or paper forming the wrapper is in the range of 10 to 100 microns or preferably 30 to 70 microns.

[0344] In conjunction with specific embodiments, the hydrophobic groups are covalently bonded to the inner surface of the wrapper. In other embodiments, the hydrophobic groups are covalently bonded to the outer surface of the wrapper. It has been found that covalently bonding the hydrophobic groups to one side or surface of the wrapper imparts hydrophobic properties to the opposite side or surface of the wrapper. Hydrophobic wrappers or hydrophobically treated wrappers can reduce or prevent fluids, such as liquid fragrances or liquid release components from being soiled or absorbed or transmitted through the wrapper.

[0345] In various embodiments, the wrap, particularly the wrap region adjacent to the tubular element of the gel containing the active agent, is hydrophobic or has one or more hydrophobic regions. Such a hydrophobic wrap or hydrophobically treated wrap may have a Cobb water absorption (ISO 535:1991) value (at 60 seconds) of less than 40 g / m 2 Less than 35g / m 2 Less than 30g / m 2 , or less than 25g / m 2 .

[0346] In various specific embodiments, wrapper, particularly contiguous wrapping area of ​​the tubular element that comprises activating agent, preferably comprises gel, it has at least 90 degree water contact angle, for example at least 95 degree, at least 100 degree, at least 110 degree, at least 120 degree, at least 130 degree, at least 140 degree, at least 150 degree, at least 160 degree, or at least 170 degree.Hydrophobicity is measured by utilizing TAPPIT558 om-97 test, and the result is presented as interface contact angle and reported with " degree ", and scope can be near zero degree to near 180 degree.When contact angle was not specified together with the term hydrophobic, water contact angle was at least 90 degree.

[0347] In conjunction with specific embodiments, the hydrophobic surface is present uniformly along the length of the package, or in other specific embodiments, the hydrophobic surface is present uniformly along the length of the package.

[0348] Preferably, the wrapper is formed from any suitable cellulosic material, preferably a cellulosic material derived from a plant. In many embodiments, the wrapper is formed from a material having a proton-donating side group. Preferably, the proton-donating group is a reactive hydrophilic group, such as, but not limited to, a hydroxyl (-OH), an amine (-NH2) or a sulfhydryl (-SH2).

[0349] Particularly suitable wrappers for use in the present invention will now be described by way of example. Wrapping materials with pendant hydroxyl groups include cellulosic materials such as paper, wood, textile, natural and man-made fibers. The wrapper may also include one or more filler materials such as calcium carbonate, carboxymethylcellulose, potassium citrate, sodium citrate, sodium acetate or activated carbon.

[0350] The hydrophobic surface or region of the cellulosic material forming the wrapper can be formed with any suitable hydrophobic agent or hydrophobic group. The hydrophobic agent is preferably chemically bonded to the cellulosic material forming the wrapper, or on the protonic side group of the cellulosic material. In many embodiments, the hydrophobic agent is covalently bonded to the cellulosic material or the protonic side group of the cellulosic material. For example, the hydrophobic group is covalently bonded to the side hydroxyl group of the cellulosic material forming the wrapper. The covalent bond between the structural component of the cellulosic material and the hydrophobic agent can form a hydrophobic group, and these groups are more firmly connected to the paper material, rather than simply arranging a hydrophobic material coating on the cellulosic material forming the wrapper. By the molecular level chemical bonding hydrophobic agent in original position, rather than applying a layer of bulk, to cover the permeability of the cellulosic material, such as paper, to better maintain, because the coating tends to cover or block the hole forming a continuous sheet in the cellulosic material and reduce permeability. The amount of material required for the wrapper surface can also be reduced by chemically bonding the hydrophobic group to the paper in original position. As used herein, the term "in situ" refers to the location of a chemical reaction that occurs on or near the surface of a solid material forming an enclosure, which may be different from the reaction of cellulose dissolved in a solution. For example, the reaction occurs on or near the surface of a cellulose material forming an enclosure, which is contained in a cellulose material in a heterogeneous structure. However, the term "in situ" does not require that the chemical reaction occurs directly on the cellulose material forming the hydrophobic tubular region.

[0351] The hydrophobic reagent may comprise an acyl or fatty acid group. The acyl or fatty acid group or a mixture thereof may be saturated or unsaturated. The fatty acid group (e.g., fatty acyl halide) in the reagent may react with a proton-donating side group (e.g., hydroxyl) of the cellulosic material to form an ester bond that chemically bonds the fatty acid to the cellulosic material. In general, these reactions with the hydroxyl side groups may esterify the cellulosic material.

[0352] In one embodiment of the inclusion, the acyl or fatty acid group comprises C 12 -C 30 Alkyl (alkyl group having 12 to 30 carbon atoms), C 14 -C 24 Alkyl (alkyl group having 14 to 24 carbon atoms) or preferably C 16 -C 20Alkyl (alkyl with 16 to 20 carbon atoms). It will be appreciated by those skilled in the art that, as used herein, term " fatty acid " refers to comprise 12 to 30 carbon atoms, 14 to 24 carbon atoms, 16 to 20 carbon atoms or have greater than 15,16,17,18,19 or 20 carbon atoms long chain aliphatic, saturated or unsaturated fatty acids.In various embodiments, hydrophobic reagent comprises acyl halide, for example comprises (for example) palmityl chloride, stearyl chloride or benzoyl chloride or its mixture of fatty acid chloride. The in-situ reaction between fatty acid chloride and the cellulosic material forming continuous sheet produces fatty acid ester and hydrochloric acid of cellulose.

[0353] Any suitable method may be used to chemically bond the hydrophobic agent or group to the cellulosic material forming the hydrophobic tubular region.The hydrophobic group is covalently bonded to the cellulosic material by diffusing the fatty acyl halide on the surface of the cellulosic material without the use of a solvent.

[0354] As an example, a hydrophobic agent is deposited, such as acyl halide, fatty acid halide, fatty acid chloride, palmitoyl chloride, stearyl chloride or chloride, and mixtures thereof, and the surface of the wrapping paper is deposited under controlled temperature without solvent (solvent-free process), for example, to form a droplet of 20 microns of the agent on the surface. While continuously removing unreacted acyl chloride, along with forming an ester bond between fatty acid and the cellulose, the control of the vapor tension of the agent can promote the reaction to spread by diffusion. In some cases, the esterification of cellulose is based on the reaction of the alcohol group or side hydroxyl group of cellulose with acyl halide compounds (for example fatty acid chloride). The temperature that can be used for heating the hydrophobic agent depends on the chemical property of the agent and the fatty acid halide, and its range is for example 120 degrees Celsius to 180 degrees Celsius.

[0355] The hydrophobic agent can be applied to the cellulosic material of the wrapping paper in any useful amount or basis weight. In many embodiments, the basis weight of the hydrophobic agent is less than 3 grams per square meter, less than 2 grams per square meter, or less than 1 gram per square meter, or in the range of 0.1 to 3 grams per square meter, 0.1 to 2 grams per square meter, or 0.1 to 1 gram per square meter. The hydrophobic agent can be applied or printed on the surface of the wrapping paper and define a uniform or non-uniform pattern.

[0356] Preferably, the hydrophobic tube region is formed by reacting the side hydroxyl groups on the cellulose material of the fatty acid ester group or fatty acid group with the wrapper paper to form the fatty acid ester group or fatty acid group to form the hydrophobic surface. This reaction step can be achieved by applying a fatty acid halide (e.g., chloride), which provides the fatty acid ester group or fatty acid group to chemically bond with the side hydroxyl groups on the cellulose material of the wrapper paper to form the hydrophobic surface. The application step can be carried out by loading the liquid form of the fatty acid halide on a solid support (e.g., a brush, a roller, or an absorbent or non-absorbent pad), and then contacting the solid support with the surface of the paper. The fatty acid halide can also be applied by printing technology (e.g., gravure, flexographic printing, inkjet, daylight offset lithography), by spraying, by wetting, or by being immersed in a liquid comprising the fatty acid halide. The application step can deposit discrete islands of reagents, thereby forming a uniform or uneven pattern of hydrophobic regions on the surface of the wrapper paper. The uniform or non-uniform pattern of the hydrophobic area on the wrapper can be formed by at least 100 discrete hydrophobic islands, at least 500 discrete hydrophobic islands, at least 1000 discrete hydrophobic islands or at least 5000 discrete hydrophobic islands. Discrete hydrophobic islands can have any useful shape, for example circular, rectangular or polygonal. Discontinuous hydrophobic islands can have any useful average lateral dimension. In many embodiments, discontinuous hydrophobic islands have an average lateral dimension in the range of 5 to 100 microns or in the range of 5 to 50 microns. In order to help the diffusion of the reagent used on the surface, air flow can also be applied to the surface of the wrapper.

[0357] In conjunction with specific embodiments, the hydrophobic wrapping can be prepared by a method comprising applying a liquid composition comprising an aliphatic acid halide (preferably a fatty acid halide) to at least one surface of a wrapping paper, optionally applying an air flow to the wrapping on the surface to help diffuse the applied fatty acid halide, and maintaining for at least 5 minutes, at a temperature of 120 degrees Celsius to 180 degrees Celsius, wherein the fatty acid halide reacts with the hydroxyl group to form a fatty acid ester in the cellulose material of the wrapping paper. Preferably, the wrapping paper is made of paper, and the fatty acid halide is a mixture of benzoyl chloride, palmitoyl chloride, or a fatty acid chloride having 16 to 20 carbon atoms in the acyl group. Therefore, the hydrophobic wrapping paper prepared by the method described above can be distinguished from the material prepared by coating the surface with a pre-made fatty acid ester of cellulose.

[0358] The hydrophobic wrapping paper can be prepared by applying a liquid reagent composition to at least one surface of the wrapping paper at a rate in the range of 0.1 to 3 grams per square meter, or 0.1 to 2 grams per square meter, or 0.1 to 1 gram per square meter. The liquid reagent applied at these rates renders the surface of the wrapping paper hydrophobic.

[0359] In many embodiments, the thickness of the wrapping paper allows the hydrophobic groups or agents to be applied to one surface to significantly provide similar hydrophobic properties to two opposing surfaces. In one example, the wrapping paper has a thickness of 43 microns and is hydrophobized by a gravure (printing) process using stearyl chloride as a hydrophobic agent to one surface.

[0360] In some specific embodiments, the material or method for producing the hydrophobic properties of the hydrophobic channel region does not substantially affect the permeability of the wrap in other areas. Preferably, the agent or method for producing the hydrophobic channel region changes the permeability of the wrap in the treated area (compared to the untreated wrap area) by less than 10%, less than 5%, or less than 1%.

[0361] In many specific embodiments, the hydrophobic surface can be formed by printing reagents along the length of the cellulosic material. Any useful printing method can be utilized, for example gravure, inkjet or similar methods. Gravure printing is preferred. Reagent can comprise any useful hydrophobic group, and it can be chemically, for example covalently bonded to the cellulosic material of wrapper, particularly wrapper or the side group of cellulosic material.

[0362] In conjunction with a specific embodiment of the present invention, the aerosol generating article comprises a susceptor. In conjunction with a specific embodiment, the tubular element comprises a susceptor. Preferably, the susceptor is elongated and longitudinally arranged in the tubular element, preferably, the susceptor is in thermal contact with the gel or a porous material loaded with the gel. This can help heat transfer from the heating element in the aerosol generating device, and through the aerosol generating article, preferably through the tubular element to the susceptor, so that the gel or porous medium is in the vicinity of the adjacent gene. When the heating is heated by induction heating, the fluctuating electromagnetic field is transmitted to the susceptor through the aerosol generating article, preferably through the tubular element, so that the susceptor changes the nearby fluctuating field into thermal energy, thereby heating the gel or the porous material loaded with the gel. Typically, the thickness of the susceptor is 10 to 500 microns. In a preferred embodiment, the thickness of the susceptor is between 10 and 100 microns. Alternatively, the susceptor can be in the form of a powder dispersed in the gel. Typically, the susceptor is configured to dissipate 1 watt to 8 watts of energy when used with a specific inductor, for example, 1.5 watts to 6 watts. By configured, it is meant that the elongated susceptor may be fabricated from a specific material, and may have a specific size, which allows for a power dissipation of between 1 Watt and 8 Watts when used in conjunction with a specific conductor that generates a fluctuating magnetic field of a known frequency and known field strength.

[0363] According to another aspect of the present invention, there is provided an aerosol generating system comprising an electrically powered aerosol generating device having an inductor for producing an alternating or fluctuating electromagnetic field, and an aerosol generating article comprising a susceptor as described and defined herein. The aerosol generating article is coupled to the aerosol generating device so that the fluctuating electromagnetic field generated by the inductor induces a current in the susceptor, causing the susceptor to heat up. The electrically powered aerosol generating device is preferably capable of generating a fluctuating electromagnetic field having a magnetic field strength (H-type strength) of 1 kiloamperes per meter to 5 kiloamperes per meter (kA / m), preferably 2 kiloamperes per meter to 3 kiloamperes per meter (kA / m), for example 2.5 kiloamperes per meter (kA / m). The electrically powered aerosol generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency of 1 megahertz (MHz) to 30 megahertz, for example between 1 megahertz and 10 megahertz, for example between 5 megahertz and 7 megahertz.

[0364] Preferably, the elongated susceptor of the present invention is part of a consumable product and is therefore used only once. Since a new susceptor is used to heat each aerosol-generating article, the flavor of a series of aerosol-generating articles may be more consistent. The requirement for cleaning the aerosol-generating device is significantly easier for a device with a reusable heating element and can be achieved without damaging the heat source. In addition, the lack of a heating element that needs to penetrate the aerosol-forming substrate means that inserting and removing the aerosol-generating article from the aerosol-generating device is less likely to cause inadvertent damage to the aerosol-generating article or the aerosol-generating device. Therefore, the overall aerosol generating system is robust.

[0365] When the susceptor is located within the fluctuating electromagnetic field, eddy currents induced in the susceptor cause the susceptor to heat. Ideally, the susceptor is located in thermal contact with the gel or gel-loaded porous material of the tubular element so that the gel or gel-loaded porous material, or both, are heated by the susceptor.

[0366] In conjunction with a specific embodiment, the aerosol-generating article is designed to be coupled to an electro-aerosol generating device comprising an induction heating source. The induction heating source or inductor generates a fluctuating electromagnetic field for heating a susceptor located within the fluctuating electromagnetic field. In use, the aerosol-generating article is coupled to the aerosol-generating device such that the susceptor is located within the fluctuating electromagnetic field generated by the inductor.

[0367] Preferably, the length dimension of the susceptor is greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension. Thus, the susceptor may be described as an elongated susceptor. Such a susceptor is arranged substantially longitudinally within the rod. This means that the length dimension of the elongated susceptor is arranged to be substantially parallel to the longitudinal direction of the aerosol generating article, for example within plus or minus 10 degrees of the longitudinal axis relative to the longitudinal direction of the rod. In a preferred embodiment, the elongated susceptor element may be positioned at a radially central position within the aerosol generating article and extend along the longitudinal axis of the aerosol generating article.

[0368] The susceptor is preferably in the form of a pin, rod, strip, sheet or blade. The length of the elongated susceptor element is preferably between 5 mm and 15 mm, for example between 6 mm and 12 mm, or between 8 mm and 10 mm. Typically, the length of the susceptor is at least as long as the tubular element, and is therefore typically between 20% and 120% of the longitudinal length of the tubular element, for example between 50% and 120% of the length of the tubular element, preferably between 80% and 120% of the longitudinal length of the tubular element. Preferably, the susceptor has a width between 1 mm and 5 mm, and may have a thickness between 0.01 mm and 2 mm, for example between 0.5 mm and 2 mm. The thickness of a preferred embodiment may be between 10 microns and 500 microns, or even more preferably between 10 and 100 microns. If the susceptor has a constant cross-section (e.g. a circular cross-section), its width or diameter is preferably between 1 mm and 5 mm.

[0369] The susceptor may be formed of any material that can be heated by induction to a temperature sufficient to generate an aerosol from the aerosol-forming substrate. In preferred embodiments, the susceptor comprises metal or carbon. Preferred susceptors may comprise ferromagnetic materials, such as ferritic iron or ferromagnetic steel or stainless steel. In other specific embodiments, the susceptor comprises aluminum. Preferred susceptors may be made of 400 series stainless steel, such as 410 grade or 420 grade or 430 grade stainless steel. Different materials will consume different amounts of energy when positioned in an electromagnetic field having similar frequency and field strength values. Therefore, the parameters of the susceptor, such as material type, length, width and thickness, can be changed in a known electromagnetic field to provide the desired power consumption.

[0370] Preferably, the susceptor is heated to a temperature in excess of 250 degrees Celsius. Preferably, however, the susceptor is heated to less than 350 degrees Celsius to prevent burning of materials in contact with the susceptor. Suitable susceptors may comprise a non-metallic core having a metallic layer disposed on the non-metallic core, such as metallic traces formed on the surface of a ceramic core.

[0371] The susceptor may have an outer protective layer, such as a ceramic protective layer or a glass protective layer encapsulating the elongated susceptor.The susceptor may comprise a protective coating formed of glass, ceramic or an inert metal formed on a core of susceptor material.

[0372] Preferably, the susceptor is arranged in thermal contact with the aerosol-forming substrate, for example within a tubular element. Thus, when the susceptor is heated, the aerosol-forming substrate is heated and material is released from the gel to form an aerosol. Preferably, the susceptor is arranged in direct physical contact with the gel containing the active agent, for example within a tubular element, and the susceptor is preferably surrounded by the gel or a porous medium loaded with the gel.

[0373] In particular embodiments, the aerosol-generating article or tubular element comprises a single susceptor. Alternatively, in other particular embodiments, the tubular element or aerosol-generating article comprises more than one susceptor.

[0374] Any features described herein in relation to a particular embodiment, aspect or example of a tubular element, aerosol-generating article or aerosol-generating device may be equally applicable to any embodiment of a tubular element, aerosol-generating article or aerosol-generating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0375] Reference will now be made to the accompanying drawings, which depict one or more aspects described in the present disclosure. However, it will be understood that other aspects not depicted in the drawings fall within the scope of the present disclosure. Similar numbers used in the drawings refer to similar parts, steps, etc. However, it will be understood that the use of numbers in a given figure to refer to a part is not intended to limit the parts marked with the same number in another figure. In addition, the use of different numbers to refer to parts in different figures is not intended to indicate that the parts with different numbers cannot be the same or similar to the parts with other numbers. The drawings are presented for the purpose of illustration and not limitation. The schematic diagrams presented in the figures are not necessarily drawn to scale.

[0376] Figure 1 is a schematic cross-sectional view of an aerosol-generating device and a schematic side view of an aerosol-generating article insertable into the aerosol-generating device.

[0377] Figure 2 yes Figure 1 A schematic cross-sectional view of an aerosol generating device as depicted in FIG. 1 and a device inserted into the aerosol generating device Figure 1 Schematic side view of the article depicted in .

[0378] Figure 3 to Figure 6 are schematic cross-sectional views of various embodiments of aerosol-generating articles.

[0379] Figure 7 is a schematic side view of an aerosol-generating article.

[0380] Figure 8 yes Figure 7 A schematic perspective view of an embodiment of an aerosol-generating article depicted in , with a portion of the wrapper removed for illustrative purposes.

[0381] Fig. 9 is a schematic side view of an aerosol-generating article.

[0382] Fig.10 yes Fig. 9 Schematic side view of an embodiment of an aerosol-generating article depicted in , with a portion of the wrapper removed.

[0383] Fig.11 is a schematic diagram of a fluid guide of a sample aerosol-generating article.

[0384] Fig.12 Is inserted into Fig.11 Schematic diagram of a sample aerosol-generating article with a fluid guide as depicted in FIG.

[0385] Fig.13 Shown is a cross-sectional view taken along the length of an aerosol-generating article.

[0386] Fig.14 , Fig.15 and Fig.16 A perspective view and two cross-sectional views of a tubular element for an aerosol-generating article are shown.

[0387] Fig.17 A portion of a process for manufacturing a tubular element for an aerosol-generating article is shown.

[0388] Fig.18 A portion of another manufacturing process for a tubular element for an aerosol-generating article is shown.

[0389] Fig.19 A portion of an alternative manufacturing process for a tubular element for an aerosol-generating article is shown.

[0390] Fig. 20 An aerosol-generating system comprising an electrically heated aerosol-generating device and an aerosol-generating article is shown.

[0391] Fig.21 , Fig. 22 and Fig.23 A cross-sectional view showing a further tubular element for use in an aerosol-generating article.

[0392] Fig.24 Shown is a cross-sectional view along the length of an aerosol-generating article.

[0393] Figure 25 to Figure 29Schematic cross-sectional views of various tubular elements are shown.

[0394] Figure 30 to Figure 34 Schematic cross-sectional views of various tubular elements are shown.

[0395] Fig.35 A perspective view showing a schematic diagram of a tubular element, containing a wire loaded with gel.

[0396] Fig.36 Show Fig.35 A schematic cross-sectional view (cut from proximal to distal) of a tubular element is shown.

[0397] Fig.37 Show Fig.35 A cross-sectional view of a tubular element is shown in FIG.

[0398] Fig.38 A cross-sectional view of a tubular element is shown.

[0399] Fig.39 A cross-sectional view of a tubular element is shown. DETAILED DESCRIPTION

[0400] Figure 1 and Figure 2 An example of an aerosol-generating article for use with an aerosol-generating device is shown. Suitable for use with the tubular element of the present invention.

[0401] Figure 1 to Figure 2 An example of an aerosol generating article 100 and an aerosol generating device 200 is shown. The aerosol generating article 100 has a proximal end or mouth end 101 and a distal end 103. Figure 2 , the distal end 103 of the aerosol generating article 100 is received in a receptacle 220 of the aerosol generating device 200. The aerosol generating device 200 comprises a wrapper 110, which defines a receptacle 220, which is configured to receive the aerosol generating article 100. The aerosol generating device 200 also comprises a heating element 230, which forms a cavity 235, which is configured to receive the aerosol generating article 100, preferably by an interference fit. The heating element 230 may comprise a resistive heating component. In addition, the device 200 comprises a power supply 240 and control electronics 250, which cooperate to control the heating of the heating element 230.

[0402] The heating element 230 can heat the distal end 103 of the aerosol-generating article 100, which includes a tubular element 500 (not shown). In the present example, the tubular element 500 includes a gel 124, which includes an active agent, and the active agent includes nicotine. Heating the aerosol-generating article 100 causes the tubular element 500 including the gel 124 with the active agent to generate an aerosol containing the active agent, which can be delivered out of the aerosol-generating article 100 at the proximal end 101. The aerosol-generating device 200 includes a housing 210.

[0403] Figure 1 to Figure 2 The exact heating mechanism is not shown.

[0404] Figures 1 to 6 A longitudinal cross-sectional view of the aerosol-generating article 100 is shown. In other words, Figures 1 to 6 A view of an aerosol-generating article 100 is shown longitudinally cut in half. Figures 1 to 6 In one embodiment, the aerosol-generating article is tubular. Figures 1 to 6 The entire end surface of the aerosol-generating article 100, whether the proximal end 101 or the distal end 103, will be circular. Figures 1 to 6 In the embodiment of the present invention, the tubular element 500 is also tubular. The tubular element 500 is Figures 1 to 6 Possible tubular components of the tubular aerosol-generating article 100 of the embodiment. Figures 1 to 6 If the entire end surface of the tubular element 500 used or shown in the embodiment is round, then the surface of the tubular element will be round, whether it is the proximal end or the distal end. Figures 1 to 6 The drawings are two-dimensional longitudinal cross-sectional views, and therefore the side curvatures of the aerosol generating article and tubular element 600 and other components cannot be seen. The drawings are for illustrative purposes of illustrating the present invention and may not be drawn to scale. Figures 1 to 6 If shown in , the tubular element 500 is used to illustrate the tubular element 500 in the aerosol-generating article 100 , but the features of the aerosol-generating article 100 are optional to the embodiment of the tubular element 500 shown and should not be considered essential features of the tubular element 500 .

[0405] In some examples, the heating mechanism may operate by conductive heating, wherein heat is transferred from the heating element 230 of the aerosol generating device 200 to the aerosol generating article 100. This may readily occur when the aerosol generating article 100 is positioned in the receptacle 220 of the aerosol generating device 200 and the distal end 103 (which is preferably the end where the tubular element 500 containing the gel is located) and thus the aerosol generating article 100 is in contact with the heating element 230 of the aerosol generating device 200. In a specific example, the heating element comprises a heating blade that protrudes from the aerosol generating device 200 and is adapted to penetrate into the aerosol generating article 100 to come into direct contact with the gel 124 of the tubular element 500.

[0406] In this example, the heating mechanism is by induction, wherein when the aerosol-generating article 100 is positioned in the container 220 of the aerosol-generating device 200 , the heating element emits wireless electromagnetic radiation that is absorbed by the tubular element.

[0407] Figure 3a and Figure 3b One embodiment of an aerosol-generating article 100 comprising a wrapper 110 and a fluid guide 400 is depicted. Figure 3a and Figure 3b is a longitudinal cross-sectional view of the aerosol-generating article 100. In other words, Figure 3a and Figure Figure 3b The view of FIG. 1 is a view of the aerosol generating article 100 cut longitudinally in half. Figure 3a and Figure 3b In an embodiment of the invention, the aerosol-generating article is tubular. Figure 3a or Figure 3b The entire end surface of the aerosol-generating article 100, whether the proximal end 101 or the distal end 103, will be circular. Figure 3a or Figure 3b The tubular element 500 in the embodiment is also tubular. Figure 3a and Figure 3b The tubular member of the tubular aerosol generating article 100 of the embodiment of Figure 3a or Figure 3b If the entire end surface of the tubular element 500 of the embodiment of the present invention is rounded, then the surface of the tubular element will be rounded regardless of the proximal end or the distal end. Figure 3a and Figure 3b is a two-dimensional longitudinal cross-sectional view, so the side curvature of the aerosol generating article and the tubular element 600 and other components cannot be seen. Figure 3a , the proximal end of the tubular element 500 is not shown as having a straight edge. Figure 3bThe proximal end of the tubular element 500 is shown as a straight line across the width of the aerosol-generating article. The accompanying drawings are for illustrative purposes of illustrating the present invention and may not be drawn to scale. Figure 3a and Figure 3b The tubular element 500 is shown in to illustrate the tubular element in an aerosol-generating article, but the features of the aerosol-generating article 100 are optional to the illustrated embodiment of the tubular element and should not be considered essential features of the tubular element 500.

[0408] The fluid guide 400 has a proximal end 401, a distal end 403, and an internal longitudinal channel 430 from the distal end 403 to the proximal end 401. The internal longitudinal channel 430 has a first portion 410 and a second portion 420. The first portion 410 defines a first portion of the channel 430, the first portion of the channel extending from a distal end 413 of the first portion 410 to a proximal end 411 of the first portion 410. The second portion 420 defines a second portion of the channel 430, the second portion of the channel extending from a distal end 423 of the second portion 420 to a proximal end 421 of the second portion 420. The first portion 410 of the channel 430 has a converging cross-sectional area moving from the distal end 413 of the first portion 410 to the proximal end 411, thereby accelerating a fluid (e.g., air) through the first portion 410 of the internal longitudinal channel 430 when a negative pressure is applied at the proximal end 101 of the aerosol-generating article 100. The cross-sectional area of ​​the first portion 410 of the inner longitudinal channel 430 narrows from the distal end 413 to the proximal end 411 of the first portion 410. The second portion 420 of the inner longitudinal channel 430 has a cross-sectional area that expands from the distal end 423 to the proximal end 421 of the second portion 420 of the fluid guide 400. In the second portion 420 of the inner longitudinal channel 430, the fluid may be decelerated.

[0409] The wrapper 110 defines an open proximal end 101 and a distal end 103 of the aerosol-generating article 100. A tubular element 500 containing a gel having an active agent (not shown) is disposed in the distal end 103 of the aerosol-generating article 100. The aerosol-generating article 100 comprises an end plug 600 at its distal-most end 103. The end plug 600 is located at the distal end of the tubular element 500. The end plug 600 comprises a highly aspiration-resistant material to aspirate and thereby bias fluid into the aerosol-generating article 100 through the aperture 150 when negative pressure is applied to the proximal end 101 of the aerosol-generating article 100. The aerosol generated or released from the tubular element 500 containing the active agent, when heated, can enter the cavity 140 in the aerosol-generating article downstream of the tubular element 500 to be carried through the internal longitudinal passage 430.

[0410] The holes 150 extend through the wrap 110. At least one hole 150 communicates with an external longitudinal passage 440 formed between the outer surface of the fluid guide 400 and the inner surface of the wrap 110. A seal is formed between the fluid guide 400 and the wrap 110 at a location between the hole 150 and the proximal end 101.

[0411] When negative pressure is applied to the proximal end 101 of the aerosol-generating article 100, the fluid enters the aperture 150, flows through the outer longitudinal passage 440 into the cavity 140 and the tubular element 500 containing the gel (the gel containing the active agent), wherein the fluid may entrain the aerosol when the tubular element 500 containing the gel (the gel containing the active agent) is heated. The fluid then flows through the inner longitudinal passage 430 and through the proximal end 101 of the aerosol-generating article 100. As the fluid flows through the first portion 410 of the inner longitudinal passage 430, the fluid is accelerated. As the fluid flows through the second portion of the inner longitudinal passage 430, the fluid is decelerated. In the depicted embodiment, the wrap 110 defines a proximal cavity 130 between the proximal end 401 of the fluid guide 400 and the proximal end 101 of the article 100, which can be used to decelerate the fluid before leaving the mouth end 101.

[0412] Figure 4 Another embodiment of an aerosol-generating article 100 is depicted, comprising a wrapper 110 and a fluid guide 400 .

[0413] The fluid guide 400 has a proximal end 401, a distal end 403, and an internal longitudinal passage 430 from the distal end 403 to the proximal end 401. The internal longitudinal passage 430 has a first portion 410, a second portion 420, and a third portion 435. The first portion 410 is between the second portion 420 and the third portion 435. The first portion 410 defines a first portion of the internal longitudinal passage 430, which extends from a distal end 413 of the first portion 410 to a proximal end 411 of the first portion 410. The second portion 420 defines a second portion of the internal longitudinal passage 430, which extends from a distal end 423 of the second portion 420 to a proximal end 421 of the second portion 420. The third portion 435 defines a third portion of the internal longitudinal passage 430, which extends from a distal end 433 of the third portion to a proximal end 431 of the third portion. The third portion 435 has a substantially constant inner diameter from the proximal end 431 to the distal end 433. The first portion 410 of the internal longitudinal channel 430 has a converging cross-sectional area moving from the distal end 413 to the proximal end 411 of the first portion 410, thereby accelerating the fluid through the first portion 410 of the internal longitudinal channel 430 when negative pressure is applied at the proximal end 101 of the aerosol-generating article 100. The cross-sectional area of ​​the first portion 410 of the internal longitudinal channel 430 narrows from the distal end 413 to the proximal end 411 of the first portion 410. The second portion 420 of the internal longitudinal channel 430 has an expanding cross-sectional area from the distal end 423 to the proximal end 421 of the second portion 420 of the internal fluid channel 430. In the second portion 420 of the internal longitudinal channel 430, the fluid may decelerate as it travels from distal to proximal in a certain direction.

[0414] Similar to the article 100 depicted in FIG. 3 , Figure 4 The article depicted in the aerosol-generating article comprises a wrapper 110 defining an opening, a proximal end 101 and a distal end 103, and a high aspiration resistance end plug 600. A tubular element 500 containing a gel having an active agent is disposed in the distal end 103 of the aerosol-generating article. The aerosol generated or released from the gel containing the active agent can enter the cavity 140 in the aerosol-generating article 110 when heated to be carried through the internal longitudinal channel 430.

[0415] Although in Figure 43, the aerosol generating article 100 comprises at least one aperture (such as the aperture 150 shown in FIG. 3) extending through the wrapper 110 and communicating with an outer longitudinal passage 440 formed between the outer surface of the fluid guide 400 and the inner surface of the wrapper 110. A seal is formed between the fluid guide 400 and the wrapper 110 at a location between the aperture and the proximal end 101. Although the seal need not be fluid impermeable, it is advantageous for the seal here to have a high resistance to aspiration or a degree of impermeability to bias fluid entering the aperture 150 along the outer longitudinal passage in a distal direction toward the tubular element 500. The third portion 435 of the fluid guide 400 extends the length of the fluid guide 400 and the outer longitudinal passage 440 to provide a seal between the aperture ( Figure 4 Not shown in the figure, additional distance is provided between the proximal end 401 ) of the inner longitudinal passage accessible thereto and the tubular element 500 containing the gel with the active agent, making leakage of the gel containing the active agent less likely to occur through the aperture 150 .

[0416] When Figure 4 When negative pressure is applied at the proximal end 101 of the aerosol generating article 100 depicted in the figure, the fluid enters the hole 150, flows through the outer longitudinal channel 440 into the cavity 140 and the tubular element 500 containing the gel (the gel contains the active agent), wherein the fluid may entrain material from the heated gel containing the active agent. The fluid can then flow through the inner longitudinal channel 430 and through the proximal end 101 of the aerosol generating article. As the fluid flows through the inner longitudinal channel 430, the fluid flows through the third portion 435, the first portion 410, and then the second portion 420 of the aerosol article 100. When the fluid flows through the first portion 410 of the inner longitudinal channel 430, the fluid is accelerated. When the fluid flows through the second portion 420 of the inner longitudinal channel 430, the fluid is decelerated. In alternative embodiments, the second portion 420 and the third portion 435 of the inner longitudinal channel 430 are optional. In the depicted embodiment, the wrap defines a proximal cavity 130 between the proximal end 401 of the fluid guide 400 and the proximal end 101 of the article 100 , which can be used to decelerate the fluid before it exits the proximal end 101 .

[0417] Figure 5 and Figure 6A further embodiment of an aerosol-generating article 100 is depicted, comprising a wrap 110, an end plug 600, a tubular element 500 comprising a gel (the gel comprising an active agent), a proximal cavity 130, a cavity 140, and a fluid guide 400. The fluid guide 400 has a proximal end 401, a distal end 403, and an internal longitudinal passage 430 from the distal end 403 to the proximal end 401. The internal longitudinal passage 430 has a first portion 410 and a third portion 435. The first portion 410 defines a first portion 410 of the internal longitudinal passage 430, which extends from a distal end 413 of the first portion 410 to a proximal end 411 of the first portion 410. The third portion 435 defines a third portion of the internal longitudinal passage 430, which extends from a distal end 433 of the third portion 435 to a proximal end 431 of the third portion 435. The third portion 435 has a substantially constant inner diameter from the proximal end 433 to the distal end 431 .

[0418] exist Figure 5 , the first portion 410 of the internal longitudinal channel 430 has a substantially constant inner diameter from the distal end 413 to the proximal end 411 of the first portion 410. The inner diameter of the internal longitudinal channel 430 at the first portion 410 is smaller than the inner diameter of the internal longitudinal channel 430 at the third portion 435. The restricted inner diameter of the internal longitudinal channel 430 at the first portion 410 relative to the third portion 435 can accelerate the fluid as it flows from the third portion 435 to the first portion 410.

[0419] exist Figure 6 , the first portion 410 of the fluid guide 400 includes a plurality of segments 410A, 410B, 410C having stepped inner diameters. The most distal segment 410A has the largest inner diameter, while the most proximal segment 410C has the smallest inner diameter. When the fluid flows from the first segment 410A to the second segment 401B and from the second segment 410B to the third segment 410C through the internal longitudinal channel 430, the fluid may be accelerated as the cross-sectional area of ​​the internal longitudinal channel 430 contracts in a stepped manner.

[0420] Figure 5 and Figure 6 The first portion 410 in FIG. 4 provides an example of a configuration that may be beneficial when the material used to form the first portion 410 is not easily moldable. For example, the first portion 410 or the segments 410A, 410B, 410C of the first portion 410 may be formed from cellulose acetate tow. In contrast, FIG. 3 and Figure 4 The first portion 410 of the fluid guide 400 depicted in FIG. 4 provides an example of a configuration that may be beneficial when the material used to form the first portion 410 is moldable, such as when the first portion is formed from, for example, polyetheretherketone (PEEK).

[0421] Similar to Figure 3 and Figure 4 The aerosol-generating article 100 depicted in Figure 5 and Figure 6 The aerosol-generating article depicted in FIG. 1 comprises a wrapper 110 defining an opening, a proximal end 101, and a distal end 103 having an end plug 600 with high resistance to aspiration. In these examples containing a gel 124 (the gel containing an active agent), a tubular element 500 is disposed in the distal end 103 of the aerosol-generating article 100. Aerosol generated or released from the tubular element 500 containing the gel 124 containing the active agent can enter the cavity 140 in the aerosol-generating article 100 when heated to be carried through the internal longitudinal passage 430.

[0422] Although in Figure 5 and Figure 6 3, the aerosol generating article 100 includes at least one hole (such as the hole 150 shown in FIG. 3) extending through the wrapper 110 and communicating with the outer longitudinal passage 440 formed between the outer surface of the fluid guide 400 and the inner surface of the wrapper 110. At a location between the one or more holes 150 and the proximal end 101, a seal is formed between the fluid guide 400 and the wrapper 110. This helps to bias fluid along the outer longitudinal passage 440 in the tubular element 500 or entering through the hole 150 in the distal direction. Among other things, the third portion 435 of the inner longitudinal passage 430 is used to extend the length of the fluid guide 400 and the outer longitudinal passage 440 to extend between the hole 150 ( Figure 5 and Figure 6 , which may provide an additional benefit between the proximal end 440 of the proximal end 440 of the outer longitudinal channel and the tubular element 500 containing the gel 124 having the active agent, making leakage of the gel 124 containing the active agent through the hole 150 less likely to occur.

[0423] When Figure 5 and Figure 6When negative pressure is applied at the proximal end 101 of the aerosol-generating article 100 depicted in , fluid enters the aperture 150, flows through the outer longitudinal passage 440 into the cavity 140, and flows to the tubular element 500 containing the gel 124 having an active agent, wherein the fluid may entrain material from the aerosol when the tubular element 500 is heated. The fluid may then flow through the inner longitudinal passage 430 and through the proximal end 101. As the fluid flows through the inner longitudinal passage 430, the fluid flows through the third portion 435 of the aerosol-generating article 100 and then flows through the first portion 410. As the fluid flows into the first portion 410 of the inner longitudinal passage 430, the inner longitudinal passage 430 may accelerate because the inner diameter of the inner longitudinal passage 430 at the first portion 410 is smaller than the inner diameter of the inner longitudinal passage at the third portion 435. In Figure 6 In the aerosol-generating article 100 depicted in , the fluid may be accelerated as it passes through each segment 410A, 410B, 410C of the first portion 410 .

[0424] exist Figure 4 and Figure 5 In the embodiment depicted in , the wrapper defines a cavity 130 between the proximal end 401 of the fluid guide 400 and the proximal end 101 of the aerosol generating article 100, which cavity can be used to decelerate the fluid leaving the internal longitudinal channel 430 at the proximal end 401 of the fluid guide 400 before leaving the proximal end 101.

[0425] Figures 7 and 8 An embodiment of an aerosol generating article 100 is shown. The aerosol generating article 100 comprises a wrapper 110 and a hole 150 passing through the wrapper 110. The aerosol generating article comprises an end plug 600, which forms a distal end 103 of the aerosol generating article 100. The end plug has high resistance to suction. A tubular element 500 containing a gel (the gel containing an active agent) is disposed proximal to the end plug 600 in the aerosol generating article 100. When heated, the tubular element 500 can form an aerosol, which enters a cavity 140 proximal to the tubular element 500.

[0426] Figure 7 Shown is a side view of a tubular aerosol-generating article 100. If one looks at the face of either the proximal end 101 or the distal end 103, the end face will be circular. Figure 7 This is a two-dimensional plot, so the curvature of the tubular aerosol generating article is not visible. Figure 8 Yes Figure 7 A perspective view of the same embodiment shown and described in partial cutaway. Although partially blocked, it can be seen that the face of the distal end is rounded. It can be seen that the face of the proximal end 101 will also be rounded, although partially cutaway. Figure 8It can also be seen that the tubular element 500 is tubular in shape. Figure 8 It can also be seen that for this embodiment, end cap 600 is also tubular in shape.

[0427] At least one of the holes 150 communicates with at least one outer longitudinal channel 440 formed between the fluid guide 400 and the wrap 110 and between the side walls 450. The fluid guide 400 has an edge 460 that presses against the inner surface of the wrap 110 to form a seal. The seal is formed between the proximal end 101 and the hole 150.

[0428] When negative pressure is applied at the proximal end 101, fluid (e.g., air) can enter the aperture 150 and flow through the outer longitudinal passage 440 to the cavity 140, then flow through the tubular element 500, where material from the gel 124 is released into the fluid. The fluid then passes through the inner longitudinal passage 430, travels through the fluid guide 400 into the cavity 130 defined by the wrap 110, and passes through (and exits) the proximal end 101 of the aerosol-generating article 100. The inner longitudinal passage 430 of the fluid guide 400 can be configured in any suitable manner, such as in FIGS. 3 to 4. Figure 6 The example shown in .

[0429] Figures 9 and 10 An embodiment of an aerosol generating article 100 is shown, the aerosol generating article comprising a mouthpiece 170, which forms part of the wrapper 110 and the fluid guide 400 of the aerosol generating article 100. The aerosol generating article 100 comprises a tubular element 500, which forms the distal end 103 of the aerosol generating article 100 and is also formed by a part of the wrapper 110. The tubular element 500 is configured to be received by the distal part of the mouthpiece 170, for example by an interference fit. The tubular element 500 containing a gel 124 containing an active agent (not shown) can be disposed in the tubular element 500. The aerosol generating article 100 comprises an end plug 600 at the distal-most end 103. The end plug 600 has a high resistance to suction.

[0430] Fig. 9 Shown is a portion of a cut-away side view of a tubular aerosol-generating article 100. If the entire face of the proximal end 101 or the distal end 103 is viewed, the end face will be circular. Fig. 9 This is a two-dimensional plot, so the curvature of the tubular aerosol generating article is not visible. Fig.10 Yes Fig. 9 A partially cutaway perspective view of the same partially cutaway portion of the aerosol-generating article 100 shown and described. Although partially blocked, it can be seen that the face of the distal end is circular. It can be seen that the face of the proximal end 101 will also be circular, although partially cutaway. Also from Fig.10As can be seen from FIG. 5 , the tubular element 500 is tubular. Fig.10 It can also be seen that for this embodiment, end cap 600 is also tubular in shape.

[0431] The fluid guide 400 includes an inner longitudinal channel 430 (not shown) that includes a portion that accelerates the fluid and may include a portion that decelerates the fluid. A seal is formed between the wrap 110 and the fluid guide 400 because the wrap 110 and the fluid guide 400 are formed from a single part. The aperture 150 is formed in the wrap 110 and communicates with an outer longitudinal channel 640 that is at least partially formed by the inner surface of the wrap 110. Portions of the outer longitudinal channel 640 are generally formed between the inner surface of the wrap 110 and the exterior of the fluid guide 400. The outer longitudinal channel 640 does not extend the entire distance around the article 100. In this embodiment, the outer longitudinal channel 640 extends about 50% of the distance around the circumference of the aerosol generating article 100. The outer longitudinal channel 640 guides the fluid (e.g., air) from the aperture 150 toward the tubular element 500 (not shown) near the distal end 103.

[0432] When negative pressure is applied at the proximal end 101, fluid (e.g., ambient air) enters the aerosol-generating article 100 through the aperture 150. The fluid flows through the outer longitudinal channel 640 toward the tubular element 500 containing the gel 124 with the active agent, which is disposed at the distal end 103. The fluid then flows through the inner longitudinal channel 430 of the fluid guide 400, where the fluid is accelerated and optionally decelerated. The fluid (e.g., ambient air) can then exit the proximal end 101 of the aerosol-generating article 100.

[0433] Fig.11 is an illustration of a fluid guide 400 formed from polyetheretherketone (PEEK) material by computer numerical control (CNC) machining. Fig.11The fluid guide 400 depicted in has a length of 25 mm, an outer diameter of 6.64 mm at the proximal end, and an outer diameter of 6.29 mm at the distal end. The outer diameter at the distal end is the diameter of the distal end from the base of the side wall. The fluid guide 400 has 12 external longitudinal channels 640 formed around its outer surface, each side wall having a substantially semicircular cross-sectional area. The external longitudinal channel 640 has a radius of 0.75 mm and a length of 20 mm. The fluid guide 400 has an internal longitudinal channel 430 (not shown), which includes three parts: a first part (fluid acceleration part), a second part (fluid deceleration part) downstream or proximal to the first part, and a third part upstream or distal to the first part. The third portion of the internal longitudinal channel 430 of the fluid guide 400 extends from the distal end 103 of the aerosol generating article 100 and has an inner diameter of 5.09 mm at the distal end, which tapers to a diameter of 4.83 mm at the proximal end of the first portion of the internal longitudinal channel 430. The length of the first portion of the internal longitudinal channel is 15 mm. The first portion of the internal longitudinal channel 430 extends from the distal end at the proximal end of the third portion to the proximal end. The first portion of the internal longitudinal channel 430 has an inner diameter of 2 mm at its distal end, which tapers to 1 mm at the proximal end. The length of the first portion of the internal longitudinal channel is 5.5 mm. The second portion of the internal longitudinal channel 430 extends from the distal end at the proximal end of the first portion to the proximal end at the proximal end of the article. The second portion of the internal longitudinal channel 430 has an inner diameter of 1 mm at its distal end, which is the same as the inner diameter at the proximal end of the first portion. The inner diameter of the second part increases toward the proximal end at a decreasing rate (i.e., according to a curve), and the inner diameter of the proximal end is 5 mm. The length of the second part is 4.5 mm. Therefore, the fluid drawn from the distal end to the proximal end by the internal passage of the fluid guide encounters a chamber (third part) with a substantially constant inner diameter, a contraction section (first part) configured to accelerate the fluid, and an expansion section (second part) configured to decelerate the fluid. It has been found that providing such an internal longitudinal passage 430 for the aerosol released from the heated tubular element 500 (not shown) can enable the aerosol volume and droplet size to be controlled so as to release a satisfactory aerosol. Fig.11 is a side view of the tubular fluid guide 400 . Fig.11 This is a two-dimensional drawing, so the curvature of the tubular shape of the fluid guide 400 cannot be seen in this embodiment. If the end face of the fluid guide 400 of this embodiment is viewed, the face would be circular.

[0434] Fig.12 is a diagram of an assembled aerosol-generating article 100. The aerosol-generating article 100 comprises a wrapper 110, Fig.11The fluid guide 400 is inserted into the wrap. Fig.12 The wrap depicted in is generally a cylindrical paper tube having a length of 45 mm. One end of the wrap 110 is distal to provide a distal end of the wrap for holding a tubular element 500 (not shown). The proximal portion of the exterior of the fluid guide 400 above the exterior longitudinal passage has a diameter of 6.64 mm. This diameter is substantially the same as the inner diameter of the wrap so that an interference fit seal is formed between the proximal portion of the exterior of the fluid guide 400 and the interior of the wrap 110. The distal portion of the exterior of the fluid guide 400 (which extends the length of the exterior longitudinal passage) may have a diameter slightly smaller than the diameter of the proximal portion of the exterior of the fluid guide 400 so that the fluid guide can be easily inserted into the wrap 110 until the proximal portion of the exterior makes an interference fit. Fig.12 is a side view of the aerosol-generating article 100 . Fig.12 is a two-dimensional drawing, so the curvature of the tubular shape of the aerosol-generating article 100 cannot be seen in this embodiment. If the end face of the aerosol-generating article 100 of this embodiment were viewed, the face would be circular.

[0435] Fig.13 An aerosol-generating article 100 is shown made from a tubular element 500 containing a gel 124 disposed in a Fig.14 , 15 and 16 for further explanation. Fig.13 is a longitudinal cross-sectional view of the aerosol-generating article 100 . Fig.13 It is a two-dimensional drawing, and therefore, the curvature of the tubular shape of the fluid guide 100 and its components, such as the tubular element 500, cannot be seen. If the entire end face of the aerosol-generating article 100 of this embodiment is viewed, the face will be circular. Similarly, if the entire end face of the tubular element 500 of this embodiment is viewed, the face will be circular.

[0436] Fig.13 The aerosol-generating article 100 of the invention comprises four elements arranged in a coaxial alignment: a high resistance to suction (RTD) end plug 600 at a distal end 103, a tubular element 500 comprising a gel 124, a fluid guide 400 at a proximal end 101, and a mouthpiece 170. These four elements are arranged in sequence and surrounded by an outer wrapper 110 to form the aerosol-generating article 100. (In a similar but alternative embodiment, there is a cavity 140 between the fluid guide 400 and the tubular element 500.) The aerosol-generating article 100 has a proximal end or mouth end 101, and a distal end 103 located at the opposite end of the aerosol-generating article 100 from the proximal end 101. Fig.13 The tubular element 500 used in the aerosol-generating article 100 may or may not include a wrapper ( Fig.13 not shown).

[0437] In use, when negative pressure is applied at the proximal end 101, fluid (e.g., air) is introduced through the aperture 150 (not shown, but similar to that for Figures 1 to 10 Those described in the examples of FIG. 1A ) are inhaled through the aerosol generating article 100 .

[0438] The end plug 600 is located at the extreme distal end 103 of the aerosol-generating article 100 .

[0439] In this example, the tubular element 500 is located immediately downstream of and adjacent to the end plug 600 .

[0440] exist Fig. 9 In the embodiment shown, the distal end portion of the outer wrapper 110 of the aerosol-generating article 100 is surrounded by a tipping paper tape (not shown).

[0441] like Fig.14 , Fig.15 and Fig.16 As further shown in FIG. 5 , the tubular element 500 is a cellulose acetate tube 122 containing a gel 124 in a core, for example, the core is filled with the gel 124. In this example, the gel 124 contains an active agent, which is nicotine and an aerosol forming agent. Other examples similar to this example contain different active agents, or no active agent. Fig.14 , Fig.15 and Fig.16 All parts of tubular elements must be displayed or marked.

[0442] Fig.14 A perspective view showing a tubular element 500 is shown, Fig.15 shows a cross-sectional view coplanar with the central axis of the tubular element 500, and Fig.16 A cross-sectional view perpendicular to the central axis is shown. Fig.16 An end face of a tubular element 500 is shown.

[0443] The tubular element 500 is located in the aerosol generating article 100 ( Fig.13 ) is at the distal end 103 of the aerosol-generating article 100 so that the tubular element 500 can be penetrated by the heating element of the aerosol-generating device 200, in which example the heating element penetrates the end plug 600 (at the very distal end 103 of the aerosol-generating article 100) to contact the tubular element 500 containing the gel 124. Thus, the heating element contacts the gel 124 or is in close proximity to the gel 124.

[0444] The gel 124 contains an active agent that is released into a fluid, such as air, flowing from the hole 150 along an outer longitudinal channel (not shown) in the fluid guide 400 to the tubular element 500 near the distal end 103, and then flowing through the inner longitudinal channel 430 to the proximal end 101 (not shown). In this illustrative example, the active agent is nicotine. Optionally, the gel 124 further contains a flavor, such as menthol.

[0445] The tubular element 500 may additionally contain a plasticizer

[0446] The fluid guide 400 is located immediately downstream of the tubular element 500 and adjacent to the tubular element 500. (In a similar but alternative embodiment, for example Fig.24 , there is a cavity between the fluid guide 400 and the tubular element 500 so that the fluid guide does not contact the tubular element). In use, material released from the tubular element 500 containing the gel 124 passes along the fluid guide 400 towards the proximal end 101 of the aerosol-generating article 100.

[0447] exist Fig.13 In the example of , the mouthpiece 170 is immediately downstream of the fluid guide 400 and abuts the fluid guide 400. Fig.13 In the example of , the mouthpiece 170 comprises a conventional cellulose acetate tow filter of low filtration efficiency.

[0448] To assemble the aerosol-generating article 100, the four components are aligned and wrapped in the outer wrapper 110. Fig.13 In the case of cigarettes, the outer wrapper is conventional cigarette paper.

[0449] The tubular member 500 may be formed by an extrusion process, such as Fig.17 The cellulose acetate 122 longitudinal sides of the tubular element 500 may be formed by extruding the cellulose acetate material along a die 184 and around a mandrel 180 that projects rearwardly relative to the travel direction T of the extruded cellulose acetate material. The rear projection of the mandrel 180 is shaped as a pin and is a cylindrical member having an outer diameter of 3 mm to 7 mm and a length of 55 mm to 100 mm. (To aid in explanation, the drawings are not drawn to scale).

[0450] In the present example, the cellulose acetate material 122 is thermoset by exposure to steam S at a pressure greater than 1 bar.

[0451] The mandrel 180 is provided with a conduit 182 along which, in this example, the gel 124 is extruded into a core of a set cellulose acetate material 122 forming the longitudinal sides of the tubular element 500. In other examples, the cellulose acetate material 122 is thermoset prior to extruding the gel 124 into the core of the cellulose acetate material 122.

[0452] The composite cylindrical rod is cut into lengths to form individual tubular elements 500 .

[0453] The composite cylindrical rod is formed by a hot extrusion process in this example. Before being processed into a certain length, the composite cylindrical rod is cooled or subjected to a cooling process. Alternatively, in other examples, the composite cylindrical rod can be formed by a cold extrusion process.

[0454] In the illustrated tubular element 500 of the present example, cellulose acetate 122 is shown as the longitudinal side of the tubular element 500 having a core that will be filled with gel 124. However, alternatively, in other examples, the longitudinal side of cellulose acetate 122 may have any shape having a core (or more than one core) for receiving gel 124 extending generally along the tubular rod. In alternative specific examples, the core is filled with a porous medium loaded with gel 125.

[0455] In the present example, the cellulose acetate 122 longitudinal sides of the tubular element have a minimum thickness of 0.6 millimeters.

[0456] exist Fig.17 In the manufacturing process shown, gel 124 is continuously extruded.

[0457] exist Fig.18 In the illustrated alternative embodiment, the gel 124 may be extruded in a fractured manner, separated by gaps 128, such as Fig.18 In an alternative embodiment, the porous medium loaded with gel 125 is extruded in a fractured manner so that the core of the tubular rod has separation gaps.

[0458] The gel 124 may be heated to above room temperature before being injected into the mandrel 180. The mandrel 180 may be thermally conductive (e.g., a metal mandrel), and some externally applied heat (e.g., from steam S) is applied to heat cure the cellulose acetate. This may transfer thermal energy into the gel, and heating the gel may reduce its viscosity and facilitate its extrusion.

[0459] In such Fig.19 In the illustrated alternative embodiments, the mandrel 180 is configured to reduce heating of the gel 124 prior to extrusion. In some of these embodiments, the mandrel 180 is formed of a substantially thermally insulating material. Alternatively or additionally, the mandrel 180 is cooled by, for example, a liquid cooling jacket 186 (e.g., a water cooling jacket), having a circulating layer of cooling liquid that forms a thermal barrier between externally applied heat (e.g., steam S) and the gel 124. Maintaining the gel 124 at a cold temperature can facilitate the formation of the gel 124 within the longitudinal sides of the cellulose acetate 122 of the tubular element 500.

[0460] In this example, the tubular element 500 is formed by cutting the gaps 128 of the composite rod, which helps prevent the cutting machinery from being contaminated by the gel 124, thereby improving the cutting performance. In this example, the composite rod is cooled by a period of static cooling before cutting until a suitable cutting temperature is reached. After cutting, if the cutting is performed in the gaps 128 (in some examples, these gaps are trimmed to form the tubular element), and before being assembled into the aerosol generating article 100, the cut length has a hollow end. In this example, the rupture length of the gel 124 is 60 mm and is separated by a 10 mm gap. In other examples, the hollow ends are not trimmed at both ends to form a cavity 140 between the gel 124 and the fluid guide 400.

[0461] Alternatively, for the example shown here, in a specific example, the gel 124 can be extruded at room temperature. Furthermore, in alternative specific embodiments, the cellulose acetate is replaced by other materials, such as polylactic acid.

[0462] exist Fig.19 In the present invention, the mandrel has a cylindrical shape to facilitate the manufacture of a tubular element.

[0463] Fig. 20 FIG. 2 shows a portion of an aerosol generating device 200 with a partially inserted aerosol generating article 100, as described above and as shown in FIG. Fig.13 as shown in .

[0464] The aerosol generating device 200 comprises a heating element 230. Fig. 20 As shown, the heating element 230 is installed in the aerosol generating article 100 receiving chamber of the aerosol generating device 200. In use, the aerosol generating article 100 is inserted into the aerosol generating article receiving chamber of the aerosol generating device 200, so that the heating element 230 is inserted into the tubular element 500 of the aerosol generating article 100 through the end plug 600, as shown in FIG. Fig. 20 As shown. Fig. 20 In FIG. 2 , the heating element 230 of the aerosol generating device 200 is a heater blade.

[0465] The aerosol generating device 200 includes a power source and electronics that allow the heating element 230 to be actuated. This actuation may be manually operated, or may occur automatically in response to negative pressure applied at the proximal end of the aerosol generating article 100 inserted into the aerosol generating article receiving chamber of the aerosol generating device 200. A plurality of openings are provided in the aerosol generating device to allow air to flow to the aerosol generating article 100; the direction of flow of the fluid (e.g., air) in the aerosol generating device 200 is determined by Fig. 20 The fluid may then enter the aerosol-generating article 100 via the aperture 150, not shown.

[0466] Once the internal heating element 230 is inserted into the tubular element 500 of the aerosol-generating article 100 and actuated, the tubular element 500 containing the gel 124 (the gel containing the active agent) is heated to a temperature of 375 degrees Celsius by the heating element 230 of the aerosol-generating device 200. At this temperature, material from the tubular element 500 of the aerosol-generating article 100 leaves the gel. When negative pressure is applied to the proximal end 101 of the aerosol-generating article 100, this material from the tubular element 500 is drawn downstream through the aerosol-generating article 100, in particular, through the fluid guide 400 toward or out of the proximal end 101 of the aerosol-generating article 100.

[0467] As the aerosol passes downstream through the aerosol-generating article 100, the temperature of the aerosol is reduced due to the transfer of heat energy from the aerosol to the fluid guide 400. In the present example, the temperature of the aerosol is about 150° C. when the aerosol enters the fluid guide 400. Due to the cooling within the fluid guide 400, the temperature of the aerosol is 40° C. when the aerosol leaves the fluid guide 400. This results in the formation of aerosol droplets.

[0468] exist Fig. 20 In the illustrated example of the tubular element 500, the tubular element 500 comprises cellulose acetate forming the longitudinal side 122 of a cylindrical rod, wherein the gel 124 is located in the core or central portion of the tubular element 500. Alternatively, in other specific examples, the longitudinal side of the tubular element 500 may be paperboard; crimped paper, such as crimped heat-resistant paper or crimped sheet paper; or a polymer material, such as low-density polyethylene (LDPE).

[0469] exist Fig.14 , Fig.15 , Fig.16 In the embodiment, the tubular element 500 has a single core provided with a single gel 124, wherein the gel 124 fills the core, which is surrounded by cellulose acetate along the longitudinal sides of the tubular element 500. However, in alternative embodiments, the tubular element 500 includes more than one core. In a specific embodiment, the tubular element includes more than one gel 124. It is not necessarily shown or labeled Fig.14 , Fig.15 and Fig.16 All components of the tubular element 500.

[0470] like Fig.21 As shown in the example of FIG. 5 , the tubular element 500 includes a plurality of gels 524A, 524B extending along the axial length of the core of the tubular element 500, such as Fig.21In this embodiment, the tubular element 500 comprises cellulose acetate longitudinal sides 522, 622, 722. Not all components of the tubular element 500 need to be in Fig.21 Display or mark in the implementation scheme.

[0471] The various gels 524A, 524B may be extruded into the cellulose acetate 522 through separate conduits in a mandrel (not shown) that forms the core of the tubular element 500. The use of gels 124 having different volatilities may facilitate optimization of the delivery of the active agent.

[0472] exist Fig. 22 In the example shown, the tubular element 500 comprises a cellulose acetate longitudinal side 622, and the tubular element 500 further comprises a plurality of cores 624A, 624B, 624C, such as Fig. 22 As shown in the cross-sectional view.

[0473] In this Fig. 22 In embodiments, not all components of tubular element 500 may be shown or labeled.

[0474] In this particular example, multiple cores are provided with different gels 624A, 624B, 624C having different active agents, such as different nicotine and flavoring agents, such as Fig. 22 The use of gels with different volatilities can facilitate optimization of the delivery of the active ingredient, particularly within the time frame of the heating cycle of the aerosol generating device.

[0475] In other specific examples (not shown), each of the plurality of cores 624A, 624B, 624C is provided with the same gel 124 (not shown). The use of multiple cores helps optimize the airflow performance through the tubular element 500.

[0476] The plurality of cores may be formed by using a mandrel (not shown) having a corresponding plurality of protrusions extending rearwardly relative to the travel direction T of the extruded cellulose acetate material. The gel may be squeezed through corresponding conduits in the plurality of rearwardly extending mandrel protrusions.

[0477] exist Fig.14 , Fig.15 , Fig.16 In the embodiment, the tubular element 500 comprises longitudinal sides of cellulose acetate 122 which are filled with gel 124 in the core. However, alternatively, in a specific example in combination with other features, the core of the tubular element 500 is only partially filled with gel 124 across a cross section perpendicular to the axial length. Advantageously, this promotes axial air flow through the length of the tubular element 500. For example, as Fig.23 As shown, gel 724 may be disposed as a coating on the inner surface of the longitudinal sides of tubular element 500 .

[0478] In the example shown ( Fig.23 In the embodiment of the present invention, tubular element 500 has a hollow conduit 726 that is extended axially along its length by using a mandrel (not shown) having a central rod extending further downstream from the location where gel 724 is extruded into the tube during manufacturing to form the hollow conduit within the extruded gel 724. Not all components of tubular element 500 need to be in the Fig.23 Display or mark in the implementation scheme.

[0479] although Fig. 20 The aerosol-generating article 100 is shown for use with a blade-shaped heating element 230 of an aerosol-generating device 200, but the tubular element 500 may alternatively be used in other aerosol-generating articles 100 that are heated in different ways.

[0480] For example, Fig.24 A cross-sectional view of an example of an aerosol generating device 100 suitable for inductive heating and heating with a blade-like heating element is shown. Fig.24 An example of an aerosol-generating article 100 suitable for use with the tubular element of the present invention is shown. Fig.24 5 is a cross-sectional cutaway view of a tubular aerosol-generating article and its components, such as the tubular element 500, and therefore does not show the curvature of the tubular shape. Fig.24 In the drawings, not all components of tubular element 500 are necessarily shown or labeled.

[0481] exist Fig.24In the example of the aerosol generating article 100, in order from proximal to distal, the aerosol generating article 100 comprises a mouthpiece 170 at the proximal end 101, a fluid guide 400, a cavity 700, a tubular element 500 and an end plug 600. In the present example, the tubular element 500 comprises a gel 824 having an active agent, and further comprises a susceptor (both not shown). The susceptor in this example is a single aluminum strip centered along the longitudinal axis of the tubular element 500. When the distal end 103 of the aerosol generating article 100 is inserted into the aerosol generating device 200 (not shown), the portion of the aerosol generating article 100 comprising the tubular element 500 is positioned adjacent to the induction heating element 230 (not shown) of the aerosol generating device 200 (not shown). When negative pressure is applied at the proximal end 101 of the aerosol-generating article 100, electromagnetic radiation generated by the inductive heating element 230 is absorbed by the susceptor and helps to heat the gel 824 in the tubular element 500, thereby helping to release material from the gel 824, such as active agent entrained in the delivered aerosol. Fluid (e.g., air) enters the outer longitudinal passage 834 through the aperture 150 (not shown) before returning to the cavity to pass to the cavity 700, then to the tubular element 500, where the fluid mixes with the gel 824 and entrains the active agent, and then passes through the inner longitudinal passage 834 of the fluid guide 400 (not shown) before exiting the proximal end 101. In the present example, the longitudinal side 822 of the tubular element 500 comprises paper. The aerosol-generating article comprises an outer wrapper 850. Fig.24 The aerosol-generating article 100 shown and described may be used with Figure 1 to Figure 2 Preferably, the aerosol generating device 200 is used together with the aerosol generating device 200 as shown and described. Fig.16 An aerosol-generating article 100.

[0482] Tubular element 500 may have a variety of different combinations of, among others: gel 124, porous medium loaded with gel 125, active agent, inner longitudinal element, void space, filler material (preferably porous), and wrapping. The desired aerosol may be generated by the specific combination and arrangement of its components.

[0483] For example:

[0484] Fig.25An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115, the second tubular element 115 comprising a gel 124, the second tubular element 115 comprising a paper wrap, the second tubular element being centrally located along the longitudinal axis of the tubular element 500; and a porous filler material 132 located between the second tubular element 115 and the wrap 110. The porous filler material 132 helps to keep the second tubular element centered within the tubular element 500. In this example, the gel 124 is located within a central portion of the second tubular element 115.

[0485] Fig.26 An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a gel 124, the second tubular element comprising a paper wrap, the second tubular element being centrally located along the longitudinal axis of the tubular element 500; and the gel 124 being located between the second tubular element 115 and the wrap 110. The gel located between the second tubular element 115 and the wrap 110 helps to keep the second tubular element 115 centered within the tubular element 500. In this example, the gel 124 is located within a central portion of the second tubular element 115 and between the second tubular element 115 and the wrap 110.

[0486] Fig. 27 An example is shown in which a tubular element 500 comprises: a wrap 110; an inner longitudinal element comprising a porous medium loaded with gel 125, the inner longitudinal element comprising the porous medium loaded with gel 125 being centrally located along the longitudinal axis of the tubular element 500; and a gel 124 located between the inner longitudinal element comprising the porous medium loaded with gel 125 and the wrap 110. The gel 124 may help to keep the inner longitudinal element comprising the porous medium loaded with gel 124 centrally within the tubular element 500. In this example, the inner longitudinal element is cross-shaped in its longitudinal cross-section, and portions of the inner longitudinal element contact the inner surface of the wrap 110. Other examples may use inner longitudinal elements of other shapes and sizes, and therefore not necessarily contact the inner surface of the wrap 110. Other specific examples may also use inner longitudinal elements of different materials.

[0487] Fig.28An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a gel 124, the second tubular element 115 comprising a paper wrap, the second tubular element being centrally located along the longitudinal axis of the tubular element 500; and a porous medium loaded with the gel 124, the porous medium being located between the second tubular element 115 and the wrap 110. In this example, the porous medium loaded with the gel 124 helps to keep the second tubular element 115 centered within the tubular element 500.

[0488] Fig.29 An example is shown in which a tubular element 500 comprises: a wrap 110; a porous medium loaded with a gel 125; and a gel 124; wherein the porous medium loaded with the gel 125 is located near the inner surface of the wrap 110 and surrounds the gel 124. In this example, both the gel 124 and the porous medium loaded with the gel 125 are present. The porous medium loaded with the gel 125 coats the inner surface of the wrap, but the shape of the porous medium loaded with the gel 125 may be formed first and then wrapped by the wrap 110. In this example, the porous medium loaded with the gel 125 surrounds the gel 124, which is held centrally along the longitudinal axis of the tubular element 500. The porous medium loaded with the gel may help to hold the gel 125 along the central position.

[0489] Fig.30 An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a porous medium loaded with a gel 125; the second tubular element 115 comprises a paper wrap; the second tubular element 115 is centrally located along the longitudinal axis of the tubular element 500; and a porous filler material 132 is located between the second tubular element 115 and the wrap 110. The porous filler material 132 helps to keep the second tubular element centered within the tubular element 500. In this example, the porous medium loaded with the gel 125 is located within the central portion of the second tubular element 115. In this example, the paper wrap of the second tubular element 115 surrounds the porous medium loaded with the gel.

[0490] Fig.31An example is shown where a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a porous medium loaded with a gel 125, the second tubular element 115 being centrally located along the longitudinal axis of the tubular element 500, the second tubular element further comprising a paper wrap; a porous medium loaded with a gel 125, the porous medium being located between the second tubular element 115 and the wrap 110. In this example, the porous medium loaded with a gel 125 is in two locations, within the second tubular element 115 and between the second tubular element and the wrap 110. These may have the same or different porous media, gels or active agents.

[0491] Fig.32 An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a porous filler material 132, the second tubular element 115 being centrally located along the longitudinal axis of the tubular element 500, the second tubular element 115 further comprising a paper wrap; a porous medium having a gel 125 located between the second tubular element 115 and the wrap 110. The porous medium loaded with gel can help to keep the second tubular element 115 centered along the longitudinal axis of the tubular element 500. In this example, the porous medium loaded with gel 125 is adjacent to the inner surface of the wrap 110. The porous medium loaded with gel 125 coats the inner surface of the wrap 110.

[0492] Fig.33 An example is shown in which a tubular element 500 comprises: a wrap 110; a second tubular element 115 comprising a porous medium loaded with a gel 125, the second tubular element 115 being centrally located along the longitudinal axis of the tubular element 500, the second tubular element 115 further comprising a paper wrap; and a gel 124 located between the second tubular element 115 and the wrap 110. In this example, the gel 124 can help to keep the second tubular element 115 centered along the longitudinal axis of the tubular element 500. In this example, the gel 124 is adjacent to the inner surface of the wrap 110. In this example, the porous medium loaded with the gel 124 is centrally located within the second tubular element 115, surrounded by the paper wrap of the second tubular element 115.

[0493] Fig.34An example is shown in which a tubular element 500 comprises: a wrap 110; an inner longitudinal element comprising a porous medium loaded with a gel 125, the inner longitudinal element comprising a porous medium loaded with a gel 125 being cylindrical and centrally located along the longitudinal axis of the tubular element 500; and a gel 124 located between the inner longitudinal element comprising a porous medium loaded with a gel 125 and the wrap 110. The gel 124 may help to hold the inner longitudinal element comprising a porous medium loaded with a gel 124 centrally within the tubular element 500. In this example, the inner longitudinal element is cylindrical in its longitudinal cross-section and is held apart from the inner surface of the wrap 110 by the gel 124. Other examples may use inner longitudinal elements and materials of other shapes and sizes.

[0494] Fig.35 , Fig.36 and Fig.37 A tubular element 500 is shown that contains a gel-loaded thread 125. In this example, the gel-loaded thread 125 extends longitudinally, substantially parallel to the longitudinal axis of the tubular element 500. In this example, there is a second tubular element 304 with an inner wrap 115, which is centered within the tubular element 500. The second tubular element 304 is also positioned longitudinally within the tubular element 500. The thread loaded with gel 125 is positioned between the second tubular element 304 and the inner surface of the wrap 110. Fig.35 , Fig.36 and Fig.37 In the example shown in , the gel-loaded thread extends along substantially the entire longitudinal length of the tubular element.

[0495] Fig.38 Also shown is a tubular element 500 containing a wire loaded with gel 125. In this example, there are three second tubular elements 304, and the wire loaded with gel 125 is positioned between the three second tubular elements and between the second tubular elements and the inner surface of the wrap 110.

[0496] Fig.39 A tubular element is shown containing a line loaded with gel 125, wherein the tubular element 500 contains more than one gel 124. In this example, the lines loaded with gel 125 are evenly divided between a line loaded with gel 125A having one gel 124 and a line loaded with gel 125B having another gel 124.

[0497] All scientific and technical terms used herein have the meanings commonly used in the art unless otherwise indicated. Definitions provided herein are to facilitate understanding of certain terms frequently used herein.

[0498] As used in this specification and the appended claims, the singular forms "a," "an," and "the," encompass plural referent embodiments, unless the content clearly dictates otherwise.

[0499] As used in this specification and the following claims, the term "or" is generally employed in its sense including "and / or" unless the content clearly dictates otherwise.

[0500] As used herein, "having", "including", "comprising", etc. are used in their open sense and generally mean "including (but not limited to)". It should be understood that "consisting essentially of", "consisting of", etc. are included in "comprising", etc.

[0501] The words "preferred" and "preferably" refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, and is not intended to exclude other embodiments from the scope of the disclosure including the claims.

[0502] Any directions mentioned herein such as "top", "bottom", "left", "right", "upper", "lower", and other directions or orientations described herein for the sake of clarity and brevity are not intended to limit the actual device or system. The devices and systems described herein can be used in multiple directions and orientations.

[0503] The embodiments illustrated above are not limiting. Other embodiments consistent with the above embodiments will be apparent to those skilled in the art.

[0504] Example

[0505] 1. A tubular element comprising a first longitudinal channel and further comprising a porous medium loaded with a gel; the gel comprising an active agent.

[0506] 2. The tubular element of embodiment 1, wherein the tubular element comprises a wrapping.

[0507] 3. The tubular element of embodiment 1 or 2, wherein the tubular element comprises a second tubular element longitudinally positioned within the first longitudinal channel.

[0508] 4. The tubular element of embodiment 3, wherein the second tubular element comprises a porous medium loaded with a gel.

[0509] 5. The tubular element of any one of embodiments 3 or 4, wherein the porous medium loaded with gel is positioned between the second tubular element and a wrap forming the first longitudinal channel.

[0510] 6. The tubular element of any of embodiments 3, 4 or 5, wherein a gel is positioned between the second tubular element and the wrap forming the first longitudinal passage.

[0511] 7. The tubular element of embodiment 1, comprising a longitudinal element positioned longitudinally within the first longitudinal channel.

[0512] 8. The tubular element of any one of embodiments 2 or 7, wherein the wrap is rigid.

[0513] 9. The tubular element of any one of embodiments 2 to 8, wherein the wrap is waterproof.

[0514] 10. The tubular element of any one of embodiments 3 to 9, wherein the longitudinal sides of the second tubular element are rigid.

[0515] 11. The tubular element of any preceding embodiment, further comprising a susceptor to facilitate heat transfer.

[0516] 12. The tubular element of any preceding embodiment, wherein the porous medium loaded with gel is corrugated.

[0517] 13. The tubular element of any preceding embodiment, wherein the porous medium loaded with gel is shredded.

[0518] 14. An article comprising the tubular element of any one of examples 1 to 13.

[0519] 15. A method of manufacturing a tubular element according to any preceding embodiment,

[0520] The method comprises the following steps:

[0521] dispensing a porous medium loaded with gel onto a web of wrapping material and dispensing a second tubular element onto the porous medium loaded with gel on the web of wrapping material;

[0522] The web of wrapping material is wrapped around the porous medium loaded with gel and the second tubular element to form a composite structure of the porous medium loaded with gel and the second tubular element.

Claims

1. A tubular element for use with an aerosol generating article, the tubular element comprising a first longitudinal channel and further comprising a porous medium loaded with a gel; the gel comprising an active agent; wherein the porous medium loaded with the gel comprises a sheet material and is corrugated, wherein, The gel is loaded into the sheet material before or after the sheet materials are brought together; wherein the gel containing the active agent contains an aerosol former; wherein the active agent contains nicotine; wherein the gel containing the active agent contains 60% to 95% by weight glycerin; and wherein the porous medium contains cotton.

2. The tubular element of claim 1, wherein the porous medium comprises viscose, polylactic acid, cellulose acetate, or a combination thereof.

3. The tubular element of claim 1, wherein the porous medium comprises a wire.

4. The tubular element of claim 1, wherein the porous medium comprises a woven material, a nonwoven material, or a combination thereof.

5. The tubular element of claim 1, wherein the porous medium comprises an extruded material.

6. The tubular element of claim 1, wherein the tubular element further comprises a susceptor.

7. The tubular element of claim 1, wherein the tubular element further comprises a wrap.

8. The tubular element of claim 7, wherein the wrapper comprises paper.

9. The tubular element of claim 8, wherein the wrap is hydrophobic.

10. The tubular element of claim 9, wherein the wrap comprises hydrophobic groups covalently bonded to at least one surface of the wrap.

11. The tubular element of claim 6, wherein the susceptor is positioned longitudinally with the tubular element.

12. The tubular element of claim 11, wherein the tubular element comprises a second tubular element.

13. The tubular element of claim 12, wherein the second tubular element comprises a wrap.

14. An aerosol generating product, comprising an end plug with anti-suction properties at its distal end, a tubular element according to any one of claims 1 to 13, a fluid guide and a mouthpiece at the proximal end of the aerosol generating product, wherein the end plug, the tubular element, the fluid guide and the mouthpiece are arranged in coaxial alignment in sequence.

15. A method of manufacturing a tubular element for use with an aerosol-generating article according to any one of claims 1 to 13, The method comprises the following steps: dispensing a porous medium loaded with gel onto a web of wrapping material and dispensing a second tubular element onto the porous medium loaded with gel on the web of wrapping material; Wrapping the web of wrapping material around the porous medium loaded with gel and the second tubular element to form a composite structure of the porous medium loaded with gel and the second tubular element; Features: The gel containing the active agent comprises 60% to 95% by weight of glycerol; and Wherein, the porous medium comprises cotton.

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