Substrates for reducing the perception of roughness

Abstract

An aerosol-generating substrate for use in an aerosol-generating system, the aerosol-generating substrate comprising: a cut filler comprising cut plant material, an aerosol former, and a harshness-reducing agent, wherein the harshness-reducing agent consists of a carboxylic acid, wherein the carboxylic acid has a vapour pressure of 0.001 to 1.00 Torr at 25 degrees Celsius.

Description

[0001] This invention relates to an aerosol generating matrix and an aerosol generating article comprising the aerosol generating matrix. The invention also relates to a method for manufacturing the aerosol generating matrix. Furthermore, the invention relates to an aerosol generating system comprising the aerosol generating article.

[0002] Heated aerosol-generating articles, which heat a matrix such as one containing chopped plant material and an aerosol-forming agent to form an aerosol rather than to burn it to form smoke, are known in the art. One purpose of this “heated” aerosol-generating article is to reduce the types of known harmful smoke components produced by the combustion and thermal degradation of tobacco in conventional cigarettes.

[0003] Typically, in heated aerosol-generating articles, aerosols are generated by transferring heat from a heat source to a physically separated aerosol-generating matrix. During use, volatile compounds are released from the aerosol-generating matrix via heat transfer from the heat source to the matrix and are entrained in the air drawn in by the aerosol-generating article. As the released compounds cool, they condense to form an aerosol inhaled by the user.

[0004] Numerous aerosol generation systems, including handheld aerosol generating devices, are known in the art, wherein the devices are configured to heat an aerosol generating matrix of a heated aerosol generating article. These devices include electrically operated aerosol generating devices, wherein aerosols are generated by transferring heat from one or more electrically heated elements of the aerosol generating device to the aerosol generating matrix of the heated aerosol generating article. Known handheld electrically operated aerosol generating devices typically include a battery, control electronics, and one or more electrically heated elements for heating an aerosol generating matrix of a heated aerosol generating article specifically designed for use with an aerosol generating device.

[0005] Some known electrically operated aerosol generating apparatuses include an internal heating element configured to be inserted into the aerosol generating matrix of a heated aerosol generating article. For example, WO 2013 / 098410 A2 discloses an aerosol generating system comprising an aerosol generating article and an electrically operated aerosol generating apparatus, the electrically operated aerosol generating apparatus including a blade-shaped heating element inserted into the aerosol generating matrix of the aerosol generating article.

[0006] Other known electrically operated aerosol generating apparatuses include one or more external heating elements. For example, WO2020 / 115151 A1 discloses an aerosol generating system comprising an aerosol generating article and an electrically operated aerosol generating apparatus, the electrically operated aerosol generating apparatus including an external heating element defining an outer periphery of the aerosol generating article.

[0007] Electrically operated aerosol generating apparatuses, including sensors configured to inductively heat the aerosol generating matrix of an aerosol generating article, are also known in the art. For example, WO 2015 / 176898 A1 discloses an aerosol generating system comprising an aerosol generating article and an electrically operated aerosol generating apparatus. The aerosol generating article includes an elongated sensor in thermal contact with the aerosol generating matrix, and the electrically operated aerosol generating apparatus has a sensor for heating the aerosol generating matrix. In use, a fluctuating or alternating electromagnetic field generated by the sensor induces eddy currents in the sensor, causing the sensor to heat up due to one or both of resistive losses (Joule heating) and hysteresis losses (in the case that the sensor is magnetic). The heat generated in the sensor is transferred to the aerosol generating matrix via conduction.

[0008] In heated aerosol generation systems used to deliver nicotine to users, pulmonary delivery of the inhalable aerosol generated from the heated aerosol generation matrix is ​​important for user palatability and satisfaction. Nicotine adsorption via the alveoli is rapid and efficient. In contrast, nicotine adsorption in the upper airways is slower and less efficient. Upper airway nicotine adsorption may also be undesirably perceived by users as having a harsh sensory experience and causing irritation to the mouth and throat.

[0009] In the field of heated aerosol-generating products and in the field of combustible aerosol-generating products, it is important to minimize discomfort to users.

[0010] It is known in the art to provide an aerosol-generating article including a filter element. The filter element includes a filter material, typically cellulose acetate tow. However, there is a need in the art to replace components, including filter elements, made of cellulose acetate with more sustainable materials. Paper is widely used in many applications, including filtration. However, it has been found that using paper as a filter material in aerosol-generating articles such as heated non-combustible products and combustible cigarettes can produce an undesirable sensory roughness.

[0011] This invention relates to an aerosol generating matrix for use in an aerosol generating system. The aerosol generating matrix may contain shredded filler. The shredded filler may contain chopped plant material. The aerosol generating matrix may contain an aerosol forming agent. The aerosol generating matrix may contain a roughness-reducing agent. The roughness-reducing agent may be composed of a carboxylic acid. The carboxylic acid may have a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius.

[0012] According to a first aspect of the present invention, an aerosol generation matrix for use in an aerosol generation system is provided, the aerosol generation matrix comprising:

[0013] Filler containing shredded plant material.

[0014] Aerosol forming agents, and

[0015] A roughness reducing agent, wherein the roughness reducing agent is composed of a carboxylic acid, wherein the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius.

[0016] Advantageously, the inventors have discovered that the volatility of the roughness-reducing agent is low enough to minimize its loss during the manufacture and processing of the aerosol-generating matrix, as well as in the aerosol-generating matrix and aerosol-generating articles. Therefore, a roughness-reducing agent composed of a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius can be directly contained in the aerosol-generating matrix. For example, the roughness-reducing agent does not need to be immobilized in a compound for inclusion in the aerosol-generating matrix. For example, the roughness-reducing agent does not need to be contained in the matrix as a lower-volatility compound that degrades into a target carboxylic acid for protonating nicotine.

[0017] Advantageously, it has been found that the roughness-reducing agent has sufficiently high volatility to be readily released into the inhalable aerosols generated during the heating of the aerosol-generating matrix. Advantageously, the roughness-reducing agent can therefore readily geokinetize nicotine contained in the inhalable aerosols.

[0018] Advantageously, the inventors have discovered that, for example, compared with aerosol generating matrices known in the art, the aerosol generating matrix according to the first aspect has an improved transfer yield of the roughness reducing agent from the matrix to the aerosol.

[0019] Advantageously, the inventors have discovered that, compared with aerosol generating matrices known in the art, the aerosol generating matrix according to the first aspect, which contains a roughness-reducing agent, enables the generation of inhalable aerosols that exhibit reduced perceived sensory roughness and mouth and throat irritation.

[0020] Without being bound by theory, the interaction between nicotine and sufficiently volatile carboxylic acids contained in an inhalable aerosol generated by heating an aerosol-generating matrix according to the first aspect results in at least some, for example, most, of the nicotine contained in the aerosol being protonated. Unprotonated nicotine exists in the gas phase of the aerosol. In contrast, protonated nicotine exists in the liquid or particulate phase of the aerosol. It has been found that increasing the proportion of protonated nicotine in the aerosol advantageously reduces perceived sensory roughness and mouth and throat irritation. The inventors have advantageously discovered that the matrix according to the first aspect can increase the proportion of protonated nicotine in the liquid and / or particulate phases of the inhalable aerosol, and thus reduce the proportion of unprotonated nicotine in the gas phase of the inhalable aerosol. Therefore, it has been advantageously discovered that including a roughness-reducing agent composed of carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius in the aerosol-generating matrix can at least partially reduce perceived sensory roughness and mouth and throat irritation.

[0021] Advantageously, it has been found that the aerosol-generating matrix according to the first aspect of the invention enables the generation of an inhalable aerosol that provides sufficient nicotine delivery to the user. Therefore, the aerosol-generating matrix according to the first aspect of the invention does not impair nicotine delivery to the user when perceived roughness and mouth and throat irritation are at least partially reduced.

[0022] Advantageously, roughness reducers have been found to be stable in aerosol-generating matrices, for example, at ambient temperature and pressure (e.g., at 25 degrees Celsius and 1 atmosphere, respectively). For example, at ambient temperature and pressure, in aerosol-generating matrices and prior to the use of heated non-flammable products, roughness reducers do not degrade to their degradation products to any perceptible extent.

[0023] Advantageously, the roughness reducer and its degradation products have shown a satisfactory toxicological profile in preliminary evaluations and are therefore suitable for use in heated aerosol-generating articles intended for use by users.

[0024] Advantageously, it has been found that using a shredded filler containing chopped plant material minimizes the handling of plant material required during the production of the aerosol-generating matrix. For example, compared to other processes used to produce aerosol-generating matrices using plant material in different forms (such as reconstituted forms), using a shredded filler containing chopped plant material minimizes the amount of water required for producing the aerosol-generating matrix and also minimizes the required drying time. Therefore, the production of the aerosol-generating matrix according to the invention can be carried out in an energy- and cost-efficient manner.

[0025] In some instances, the carboxylic acid preferably has a vapor pressure of 0.005 to 0.95 Torr at 25 degrees Celsius, for example, a vapor pressure of 0.01 to 0.90 Torr at 25 degrees Celsius, for example, a vapor pressure of 0.012 to 0.85 Torr at 25 degrees Celsius.

[0026] It has been advantageously found that roughness reducers composed of carboxylic acids having vapor pressures within the aforementioned range can readily transfer from the matrix to the aerosol and increase nicotine protonation in the aerosol, which can lead to a reduction in perceived sensory roughness and oral and throat irritation.

[0027] The volatility of a roughness reducer composed of carboxylic acids having a vapor pressure within the aforementioned range can also be low enough to mitigate the loss of carboxylic acids, for example, during treatment of an aerosol-generating matrix.

[0028] The vapor pressure of carboxylic acids can be measured using the method described in ASTM E1194-17. Preferably, the vapor pressure of carboxylic acids is measured at three temperature values. Preferably, the vapor pressure is measured at 15 degrees Celsius, 25 degrees Celsius, and 35 degrees Celsius.

[0029] In some instances, the p-value of carboxylic acids K a It can be 3.20 to 5.50 in water at 25 degrees Celsius, for example, 3.25 to 5.30 in water at 25 degrees Celsius, for example, 3.30 to 5.20 in water at 25 degrees Celsius, for example, 3.35 to 5.15 in water at 25 degrees Celsius, for example, 3.40 to 4.50 in water at 25 degrees Celsius.

[0030] Advantageously, it has been found that p within the aforementioned range... K a The carboxylic acid-based harshness reducer can easily ionize nicotine in aerosols, which can reduce sensory roughness and mouth and throat irritation.

[0031] In examples, the boiling point of carboxylic acids can be 150 to 310 degrees Celsius, for example 160 to 270 degrees Celsius, for example 170 to 260 degrees Celsius, and for example 180 to 255 degrees Celsius.

[0032] Advantageously, the roughness-reducing agent, composed of carboxylic acids having boiling points in these ranges, is volatile, allowing the carboxylic acid to be readily transferred from the matrix to the aerosol generated by the aerosol-generating matrix at temperatures typically used in aerosol-generating articles.

[0033] Typically, carboxylic acids do not decompose at or below their boiling point. Advantageously, carboxylic acids do not degrade or decompose before being transferred from the matrix to the aerosol, where they can protonate nicotine contained in the aerosol generated from the aerosol-generating matrix.

[0034] In some instances, the aerosol-generating matrix is ​​preferably stable against thermal decarboxylation at temperatures below or equal to 300 degrees Celsius. For example, roughness-reducing agents composed of carboxylic acids do not undergo decarboxylation at temperatures below or equal to 300 degrees Celsius. In other words, roughness-reducing agents composed of carboxylic acids are preferably not capable of undergoing thermal decarboxylation at temperatures below or equal to 300 degrees Celsius.

[0035] Preferably, the carboxylic acid is a monocarboxylic acid.

[0036] Preferably, the carboxylic acid is an aliphatic carboxylic acid.

[0037] Typically, carboxylic acids have a chain length of 3 to 8 carbon atoms.

[0038] In some instances, the carboxylic acid is selected from lactic acid, levulinic acid, succinic acid, crotonic acid, sorbic acid, trans-2-hexenoic acid, 3-hexenoic acid, 2-ethylbutyric acid, hexanoic acid, benzoic acid, 5-methyl-2-furonic acid, and cyclohexanecarboxylic acid.

[0039] The vapor pressures of the aforementioned carboxylic acids have been found to be as follows:

[0040]

[0041] In some instances, the aerosol-generating matrix comprises: a shredded filler containing chopped plant material, an aerosol forming agent, and a roughness-reducing agent, wherein the roughness-reducing agent is composed of a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius and / or the carboxylic acid is selected from lactic acid, levulinic acid, succinic acid, crotonic acid, sorbic acid, trans-2-hexenoic acid, 3-hexenoic acid, 2-ethylbutyric acid, hexanoic acid, benzoic acid, 5-methyl-2-furonic acid, and cyclohexanecarboxylic acid.

[0042] In some instances, the carboxylic acid is preferably lactic acid, acetylpropionic acid, or crotonic acid.

[0043] Typically, carboxylic acids are α-hydroxycarboxylic acids.

[0044] In some particularly preferred examples, the carboxylic acid is lactic acid.

[0045] Typically, the carboxylic acid is configured to directly protonate nicotine in an aerosol generated by heating an aerosol-generating matrix. For example, the carboxylic acid does not decompose or decarboxylate before protonating the nicotine contained in the aerosol generated by heating the aerosol-generating matrix. Advantageously, the carboxylic acid does not need to be immobilized in another compound in the aerosol-generating matrix (e.g., as a less volatile compound) to protonate the nicotine contained in the aerosol generated by heating the aerosol-generating matrix.

[0046] Typically, carboxylic acids are present in 0.1 to 10% by weight on a dry weight basis. For example, carboxylic acids may be present in 0.5 to 7.5% by weight on a dry weight basis, preferably 0.75 to 5% by weight on a dry weight basis, more preferably 1.0 to 3% by weight on a dry weight basis, more preferably 2.0 to 3.0% by weight on a dry weight basis, and even more preferably 2.0 to 2.5% by weight on a dry weight basis.

[0047] In some instances, the matrix preferably contains a single roughness-reducing agent. For example, the matrix preferably contains a roughness-reducing agent composed of a carboxylic acid as described above.

[0048] For example, the roughness-reducing agent is preferably the sole source of carboxylic acid in the matrix.

[0049] In particularly preferred embodiments, the aerosol-generating matrix does not contain geminal dicarboxylic acids.

[0050] Preferably, the matrix is ​​a solid aerosol generating matrix. Advantageously, the solid form of the matrix facilitates manipulation of the aerosol generating matrix during the manufacture of the aerosol generating article, compared to, for example, a liquid aerosol generating matrix.

[0051] In some instances, shredded plant material may contain tobacco material. For example, shredded plant material may contain shredded tobacco material.

[0052] For example, tobacco materials may include one or more tobacco materials from light tobacco, dark tobacco, flavored tobacco and filler tobacco.

[0053] In some embodiments of the invention, the shredded plant material is composed of tobacco material. For example, the shredded plant material may be composed of shredded tobacco material.

[0054] In an example of the present invention, the tobacco material may comprise one or more of tobacco leaves, tobacco ribs, tobacco stems, and tobacco stalks.

[0055] In some embodiments of the present invention, the tobacco material may consist of tobacco leaves, tobacco ribs, tobacco stems or tobacco stalks.

[0056] In some instances, shredded plant material containing tobacco material may also contain additives. These additives may be evenly distributed throughout the shredded plant material containing tobacco material. For example, the additives may be non-tobacco plant material, such as shredded non-tobacco plant material, as described further below.

[0057] In some instances, the shredded plant material may contain non-tobacco plant material. For example, the shredded plant material may contain shredded non-tobacco plant material.

[0058] In some instances, non-tobacco plant materials were also present in addition to tobacco materials.

[0059] In other instances, non-tobacco plant materials serve as substitutes for tobacco materials in shredded fillers. For example, the shredded plant material may contain or consist primarily of non-tobacco plant materials. In such cases, the shredded filler may be substantially free of tobacco material, allowing the aerosol-generating matrix to be considered a tobacco-free aerosol-generating matrix.

[0060] In some instances, the shredded plant material consists of non-tobacco plant material. For example, the shredded plant material consists of shredded non-tobacco plant material.

[0061] Non-tobacco plant material may include or consist of one or more of the following: leaves, stems, seeds, roots, bark, flowers, and rib fragments of non-tobacco plants.

[0062] For example, non-tobacco plant materials may comprise or consist of one or more of the following: tea, coffee, star anise, lavender, cloves, peppermint, chamomile, rosemary, eucalyptus, ginger, dill seeds, thyme, oregano, and cumin. Preferably, the non-tobacco plant material comprises or consists of cloves. Non-tobacco plant materials can advantageously improve the sensory properties of the aerosol-generating matrix.

[0063] Preferably, the shredded filler contains at least 25% plant leaves, more preferably at least 50% plant leaves, even more preferably at least 75% plant leaves, and most preferably at least 90% plant leaves.

[0064] For example, the shredded filler may contain at least 25% shredded tobacco leaves, more preferably at least 50% shredded tobacco leaves, even more preferably at least 75% shredded tobacco leaves, and most preferably at least 90% shredded tobacco leaves.

[0065] In other examples, the shredded filler may contain at least 25% non-tobacco plant leaves, more preferably at least 50% non-tobacco plant leaves, even more preferably at least 75% non-tobacco plant leaves, and most preferably at least 90% non-tobacco plant leaves.

[0066] In this example, the matrix contains nicotine.

[0067] For example, the matrix may contain exogenous nicotine. The term "exogenous nicotine" refers to nicotine added as a separate component to the aerosol-generating matrix and is different from any nicotine endogenously present in the chopped plant material, for example, in the case where the chopped plant material comprises chopped tobacco material.

[0068] Preferably, in instances where the shredded plant material comprises non-tobacco plant material, exogenous nicotine is added to the aerosol-generating matrix.

[0069] In instances where the chopped plant material comprises tobacco plant material or other instances where it is composed of tobacco plant material, the matrix may contain only endogenous nicotine. In some instances, the aerosol-generating matrix may contain both exogenous and endogenous nicotine.

[0070] The total nicotine content of the aerosol generating matrix is ​​preferably 0.5% to 5% by weight on a dry weight basis, more preferably 1% to 4% by weight on a dry weight basis, and even more preferably 1.5% to 3% by weight on a dry weight basis. The total nicotine content corresponds to the combined amount of endogenous and exogenous nicotine present in the aerosol generating matrix.

[0071] For example, total nicotine content may refer to the total amount of endogenous nicotine present only in the aerosol-generating matrix (e.g., examples include shredded fillers containing or composed of shredded tobacco material).

[0072] In other instances, total nicotine content may refer to the total amount of exogenous nicotine present only in the aerosol-generating matrix (e.g., in instances where the included shredded filler contains or is composed of non-tobacco plant material).

[0073] In other instances, total nicotine content may refer to the total amount of endogenous and exogenous nicotine (e.g., in instances where the shredded filler contains shredded tobacco material and additional exogenous nicotine).

[0074] Typically, the aerosol generating matrix preferably comprises 40 to 98% by weight of shredded filler, more preferably 50 to 95% by weight of shredded filler, more preferably 60 to 90% by weight of shredded filler, and more preferably 70 to 85% by weight of shredded filler, based on a dry weight. In some examples, the aerosol generating matrix comprises about 82% by weight of shredded filler, based on a dry weight.

[0075] Preferably, the shredded filler includes other shredded filler tobacco or additives.

[0076] The aerosol-generating matrix contains an aerosol forming agent. The aerosol forming agent can be any suitable known compound or mixture of compounds that promotes the formation of a dense and stable aerosol during use. Suitable aerosol forming agents include, for example: polyols, such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerol; esters of polyols, such as mono-, di-, or triacetic acid esters of glycerol; aliphatic esters of monocarboxylic acids, dicarboxylic acids, or polycarboxylic acids, such as dimethyl dodecanoate and dimethyl tetradecanoate; and combinations thereof.

[0077] In some instances, the aerosol forming agent may comprise, or consist of, propylene glycol, triethylene glycol, 1,3-butanediol, glycerol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, dimethyl dodecanoate, and dimethyl tetradecanoate. Preferably, the aerosol forming agent comprises propylene glycol, glycerol, or a mixture of propylene glycol and glycerol.

[0078] Typically, the aerosol generating matrix may contain at least 10% by weight of an aerosol forming agent on a dry weight basis. Preferably, the aerosol generating matrix contains at least 12% by weight of an aerosol forming agent on a dry weight basis, more preferably at least 15% by weight of an aerosol forming agent.

[0079] Preferably, the aerosol generating matrix comprises less than or equal to 40% by weight of aerosol forming agent on a dry weight basis, more preferably less than or equal to 30% by weight of aerosol forming agent, more preferably less than or equal to 25% by weight of aerosol forming agent, and more preferably less than or equal to 20% by weight of aerosol forming agent.

[0080] For example, the aerosol generating matrix may contain between 10% and 40% by weight of aerosol forming agent on a dry weight basis, or between 12% and 30% by weight, or between 15% and 25% by weight, or between 15% and 20% by weight. In some instances, the aerosol generating matrix contains approximately 18% by weight of aerosol forming agent.

[0081] Preferably, the chopped plant material is soaked in an aerosol-forming agent. Soaking of the chopped plant material can be accomplished by spraying or other suitable application methods.

[0082] Preferably, the chopped plant material is impregnated with an aerosol forming agent.

[0083] In some instances, aerosol forming agents can be applied to plant materials during the production of shredded fillers (e.g., during the conditioning step).

[0084] In some instances, aerosol forming agents can be applied as a coating to the surface of shredded plant material. Aerosol forming agents can also penetrate the plant material to some extent.

[0085] In some instances, the matrix contains flavorings.

[0086] For example, the flavoring agent may contain one or more of or composed of menthol, peppermint oil, γ-octanolactone, vanillin, ethyl vanillin, methyl salicylate, linalool, bergamot oil, geranium oil, ginger oil, and lemon oil.

[0087] In instances where the shredded plant material comprises or is composed of tobacco material, the shredded plant material has an average cut width of at least 0.75 mm. Preferably, the shredded plant material comprising or composed of tobacco material has an average cut width of at least 0.8 mm, more preferably at least 0.85 mm, and even more preferably at least 0.9 mm.

[0088] Preferably, in instances where the shredded plant material forming the filler comprises or is composed of tobacco material, the shredded plant material has an average cut width of less than or equal to 2 mm, more preferably less than or equal to 1.75 mm, more preferably less than or equal to 1.5 mm, and more preferably less than or equal to 1.25 mm.

[0089] For example, shredded plant material comprising or composed of tobacco material may have an average cut width between 0.75 mm and 2 mm, or between 0.8 mm and 1.75 mm, or between 0.85 mm and 1.5 mm, or between 0.9 mm and 1.25 mm. In a preferred embodiment, the shredded plant material has an average cut width of approximately 1 mm.

[0090] In instances where the shredded plant material comprises or is composed of non-tobacco plant material, the shredded plant material may have a cut width between 0.1 mm and 0.5 mm. Shredded plant material comprising or composed of non-tobacco plant material with a cut width between 0.1 mm and 0.5 mm is beneficial for manufacturing purposes and for the uniformity of the aerosol generation matrix. At cut widths greater than 0.5 mm, manufacturing becomes more challenging, and the uniformity of the shredded plant material in the aerosol generation matrix decreases.

[0091] In some preferred embodiments, the shredded plant material comprising or composed of non-tobacco plant material has a cut width of less than or equal to 0.5 mm. More preferably, the shredded plant material comprising or composed of non-tobacco plant material has a cut width of less than or equal to 0.45 mm. Even more preferably, the shredded plant material comprising or composed of non-tobacco plant material has a cut width of less than or equal to 0.39 mm.

[0092] Preferably, the chopped plant material comprising or composed of non-tobacco plant material has a cut width of at least 0.1 mm. More preferably, the chopped plant material comprising or composed of non-tobacco plant material has a cut width of at least 0.2 mm. Even more preferably, the chopped plant material comprising or composed of non-tobacco plant material has a cut width of at least 0.3 mm.

[0093] For example, as described above, shredded plant material comprising or composed of non-tobacco plant material may have a cut width between 0.1 mm and 0.5 mm, or between 0.15 mm and 0.45 mm, or between 0.2 mm and 0.39 mm.

[0094] A method for manufacturing an aerosol-generating matrix is ​​provided. The aerosol-generating matrix may be an aerosol-generating matrix according to a first aspect of the invention. The method may include providing plant material. The method may include conditioning the plant material, wherein the conditioning includes applying an aerosol-forming agent to the plant material. The method may include applying a roughness-reducing agent to the plant material, wherein the roughness-reducing agent is composed of a carboxylic acid, and the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius. The method may include cutting the plant material to provide shredded plant material. The method may include performing a drying step to provide shredded filler with a defined moisture level.

[0095] According to a second aspect of the present invention, a method for manufacturing an aerosol-generating matrix according to a first aspect of the present invention is provided, wherein the method comprises:

[0096] - Provide plant materials;

[0097] - Conditioning plant material, wherein the conditioning includes applying an aerosol forming agent to the plant material;

[0098] - Applying a roughness-reducing agent to plant material, wherein the roughness-reducing agent is composed of a carboxylic acid and the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius;

[0099] - Cutting plant material to provide shredded plant material, and

[0100] - Perform a drying step to provide shredded filler with a defined moisture level.

[0101] Preferably, the method is not limited to the above-described order of steps.

[0102] The plant material can be tobacco plant material or non-tobacco plant material as described above.

[0103] Preferably, the conditioning step includes applying a mixture of an aerosol-forming agent and steam to the plant material.

[0104] The conditioning step can be carried out in a direct conditioning feed roller (DCCC) under the same conditions as those used in the conventional filament filler production process.

[0105] In some instances, additional additives, such as feed additives, may be applied to the plant material during the conditioning step.

[0106] In some instances, roughness reducers are applied to plant materials as a mixture with aerosol forming agents during the conditioning step.

[0107] In some instances, a roughness-reducing agent and an aerosol-forming agent are applied sequentially to the chopped plant material during the conditioning step. For example, the roughness-reducing agent may be applied to the plant material during the conditioning step after the aerosol-forming agent has been applied. In other instances, the roughness-reducing agent may be applied to the plant material during the conditioning step before the aerosol-forming agent has been applied.

[0108] In other instances, a roughness reducer may be applied to the plant material after the conditioning step.

[0109] Preferably, the roughness reducer is applied to the plant material after the drying step, for example, in a post-cutting drum. Advantageously, applying the roughness reducer to the plant material after the drying step (e.g., in a post-cutting drum) mitigates the loss of the roughness reducer during the manufacturing process (e.g., loss through evaporation). Applying the roughness reducer to the plant material after the drying step in a post-cutting drum also mitigates degradation reactions with additives (e.g., flavorings).

[0110] In some instances, an additional drying step may be performed after the roughness reducer is applied to the plant material.

[0111] In some instances, roughness reducers may be applied to plant materials as a mixture with seasonings. For example, roughness reducers may be applied to plant materials as a mixture with seasonings in a post-cutting roller, or alternatively, in a secondary roller.

[0112] In some instances, the roughness reducer may be applied to the plant material sequentially with the seasoning. The roughness reducer may be applied to the plant material sequentially with the seasoning in a post-cutting roller, or alternatively, in a secondary roller. For example, the roughness reducer may be applied to the plant material before the seasoning is applied. In other instances, the roughness reducer may be applied to the plant material after the seasoning is applied. In some instances, the roughness reducer may be applied to the plant material simultaneously with the seasoning in the post-cutting roller.

[0113] Preferably, the roughness-reducing agent is applied to the plant material by spraying. Conventional machinery can be used to apply the roughness-reducing agent to the plant material.

[0114] The cutting step is preferably performed after the conditioning step.

[0115] In other instances, the cutting step can be performed before the conditioning step.

[0116] The cutting process can be carried out using conventional methods, such as those used in the conventional production of filament fillers.

[0117] In the drying step, the conditioned plant material is dried to a defined moisture level. This can be done by conventional means, such as in a flash tower dryer. The drying temperature will depend on the properties of the plant material and the desired moisture level. It can be between 100°C and 350°C, for example, between 150°C and 250°C.

[0118] An aerosol generating article for use in an aerosol generating system is provided. The aerosol generating article may include an aerosol generating matrix according to a first aspect of the invention.

[0119] According to a third aspect of the present invention, an aerosol generating article is provided for use in an aerosol generating system, the aerosol generating article comprising an aerosol generating matrix according to a first aspect of the present invention.

[0120] Aerosol generating articles may include upstream elements located at the distal end of the aerosol generating article.

[0121] Aerosol-generating articles may include a support element located between the aerosol-generating matrix and the proximal end of the aerosol-generating article.

[0122] Typically, aerosol generating articles include an aerosol cooling element located between the aerosol generating matrix and the proximal end of the aerosol generating article.

[0123] Typically, aerosol-generating articles include a mouthpiece element located at the proximal end of the aerosol-generating article.

[0124] Typically, mouthpiece elements located near the proximal end of the article include filter elements. Filter elements are usually located near the proximal end of the article where aerosols are generated.

[0125] Preferably, the filter element includes a filter strip. Typically, the filter strip of the filter element is composed of aggregated crimped sheets of cellulose-based filter material or aggregated embossed sheets of cellulose-based filter material.

[0126] Filter elements composed of aggregated sheets of cellulose-based filter material have a low environmental impact. Filter elements composed of aggregated sheets of cellulose-based filter material have enhanced biodegradability. Filter elements composed of aggregated sheets of cellulose-based filter material have improved sustainability.

[0127] It has been found that filter strips composed of aggregated crimped sheets or aggregated embossed sheets of cellulose-based filter materials, and aerosol generating articles comprising an aerosol generating matrix according to the first aspect containing a roughness-reducing agent, possess beneficial properties. For example, aerosol generating articles comprising filter elements and an aerosol generating matrix according to the first aspect containing a roughness-reducing agent can enable the generation of inhalable aerosols with improved taste profiles, reduced perceived sensory roughness, and reduced environmental impact.

[0128] Cellulose filter material sheets may have a longitudinal axis. Filter strips may have a longitudinal axis. The longitudinal axis of the cellulose filter material sheet may be arranged parallel to the longitudinal axis of the filter strip. Preferably, the longitudinal axis of the cellulose filter material sheet is parallel to the longitudinal axis of the filter strip.

[0129] As used herein, the term "longitudinal axis" of an object refers to the axis parallel to the longest dimension of the object. The longitudinal axis of a sheet of cellulosic filter material may be parallel to the conveying direction along which the sheet of cellulosic filter material is fed into the collecting device.

[0130] Cellulose-based filter materials can be paper-based. Cellulose-based filter materials can be paper-based materials produced using conventional wet-laid technology.

[0131] Cellulose-based filter materials may contain one or both of cellulose fibers and regenerated cellulose fibers. Cellulose-based filter materials may contain cellulose fibers. Cellulose-based filter materials may contain regenerated cellulose fibers. Cellulose-based filter materials may be nonwoven materials. Cellulose-based filter materials may be nonwoven materials containing one or both of cellulose fibers and regenerated cellulose fibers. Cellulose-based filter materials may contain bleached cellulose wood fibers. Cellulose-based filter materials may be made from bleached cellulose wood fibers.

[0132] Cellulose-based filter media may contain at least 50% by weight of cellulose fibers. Cellulose-based filter media may contain at least 70% by weight of cellulose fibers. Cellulose-based filter media may contain at least 85% by weight of cellulose fibers. Cellulose-based filter media may contain at least 90% by weight of cellulose fibers. Cellulose-based filter media may contain at least 95% by weight of cellulose fibers. Cellulose-based filter media may contain at least 99% by weight of cellulose fibers.

[0133] Cellulose filter materials may contain fibers selected from the following: cellulose fibers, viscose fibers, rayon fibers, modal fibers, Tencel fibers, Lyocell fibers, cellophane, parchment paper, and any combination thereof.

[0134] Filter elements comprising filter strips of cellulose-based filter material containing fibers will reduce the environmental impact of aerosol-generating products containing such filter elements. Filter elements comprising filter strips of cellulose-based filter material containing fibers can be used to replace standard cellulose acetate filter elements. The filter elements have improved fiber distribution and therefore improved appearance. Filter elements comprising filter strips containing fibers have improved biodegradability. Filter elements containing cellulose fibers have one or more of the following: improved sustainability, enhanced biodegradability, and reduced environmental impact. Filter elements containing a relatively high amount of cellulose fibers have one or more of the following: improved sustainability, enhanced biodegradability, and reduced environmental impact.

[0135] Cellulose-based filter media may be cellulose acetate-free. The provision of filter elements, including filter strips formed from cellulose-based aggregate filter media that are cellulose acetate-free, will improve one or more of the filter element's environmental impact and biodegradability.

[0136] The circumference of the filter strips can be between 22.5 mm and 24.3 mm. The circumference of the filter strips can be between 22.8 mm and 24.0 mm. The filter element can have a suction resistance (RTD) between 1.20 mm water column (mmWg) and 3.43 mm water column per millimeter of filter strip length. The filter element can have a suction resistance (RTD) between 1.94 mm water column per millimeter of filter strip length and 2.50 mm water column per millimeter of filter strip length.

[0137] Filter strips with circumference and RTD within such a range are compatible with their use in standard aerosol-generating articles.

[0138] The filter element may contain one or more additives for reducing phenols and cresols. Preferably, the additives contain polyethylene glycol (PEG), glyceryl triacetate (TA), or triethyl citrate (TEC).

[0139] At least a portion of the filter strip may be defined by a sheet of packaging material. The packaging material may be paper packaging material, such as stick packaging and / or tipping paper. The filter strip may be entirely defined by a sheet of packaging material. The sheet of packaging material may be folded around the filter strip. The sheet of packaging material may be arranged radially around the filter strip. The sheet of packaging material may be radially adjacent to the filter strip.

[0140] Sheets of packaging material will improve the structural stability of filter strips. The use of sheets of paper packaging material will improve the biodegradability of filter elements. The use of sheets of paper packaging material will reduce the environmental impact of filter elements.

[0141] Filter elements can have lengths between 5 mm and 130 mm. Filter elements can have lengths between 7 mm and 50 mm. Filter elements can have lengths between 10 mm and 35 mm.

[0142] Filter elements with lengths within this range are compatible with their use in standard aerosol-generating articles. Filter elements with lengths within this range can provide adequate removal of unwanted compounds from aerosols.

[0143] The aerosol-generating article may further include packaging, preferably paper packaging. The paper packaging may be arranged to define at least a portion of one or more of the aerosol-forming matrix and filter elements. The packaging will improve the structural stability of the aerosol-generating article.

[0144] Aerosol-generating articles may include stick packaging and / or tipping paper. Tipping paper can be used to display information to users. Tipping paper can improve the structural stability of aerosol-generating articles.

[0145] In some instances, aerosol-generating articles are combustible aerosol-generating articles. For example, an aerosol-generating article can be a conventional cigarette. Conventional cigarettes typically have a matrix section and a filter section.

[0146] In other instances, the aerosol-generating articles are heated non-combustible aerosol-generating articles.

[0147] Typically, aerosol-generating products include receptors.

[0148] In some instances, the receptors are in direct contact with the aerosol-generating matrix.

[0149] The sensor may be disposed within at least a portion of the aerosol forming matrix. The sensor may be embedded within the aerosol forming matrix. The sensor may be configured to heat the aerosol forming matrix. The sensor may be configured to cause the aerosol forming matrix to volatilize. The sensor may be configured to be heated by an induction coil of an aerosol generating device.

[0150] An aerosol generation system is provided. The aerosol generation system may include an aerosol generation article according to a third aspect. The aerosol generation system may include an aerosol generation apparatus configured to heat an aerosol generation matrix of the aerosol generation article.

[0151] According to a fourth aspect of the present invention, an aerosol generation system is provided, comprising:

[0152] According to the third aspect, aerosol-generated articles; and

[0153] An aerosol generating apparatus configured to heat an aerosol generating matrix to generate an aerosol product.

[0154] The aerosol generation apparatus may include a cavity. The cavity may be configured to receive an aerosol forming matrix. The cavity may be configured to receive at least a portion of an aerosol-generated article. The cavity may be configured as a heating chamber.

[0155] An aerosol generating apparatus may include a heating assembly. The heating assembly may be configured to heat an aerosol forming matrix. The heating assembly may be configured to cause at least a portion of the aerosol forming matrix to volatilize. The heating assembly may include a heating element. The heating element may be configured to heat the aerosol forming matrix. The heating assembly may be an induction heating assembly or a resistance heating assembly. A resistance heating assembly may include a resistance heating element. An induction heating assembly may include an induction heating element comprising a sensor material. An induction heating assembly may include an induction coil. The induction coil may be configured to inductively heat the sensor material. The induction coil may be configured to inductively heat the sensor component of the aerosol forming matrix when the aerosol generating article is received in the cavity of the aerosol generating apparatus.

[0156] The use of carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness reducer is provided.

[0157] According to the fifth aspect, the use of carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness-reducing agent is provided.

[0158] Preferably, this aspect relates to the use of carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius for at least partially reducing the abrasiveness in aerosols, more preferably in inhalable aerosols.

[0159] Preferably, the fifth aspect relates to the use of a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius in an aerosol-generating matrix of the first aspect for at least partially reducing the roughness of inhalable aerosols from heated aerosol-generating articles according to the third aspect or heated aerosol-generating systems according to the fourth aspect.

[0160] Preferably, the purpose is to improve the odor profile of inhalable aerosols.

[0161] Preferably, the purpose is to enhance the taste experience of inhalable aerosols.

[0162] Of course, the characteristics described above for carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius apply to the fifth aspect.

[0163] A method is provided for using a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness reducer to at least partially reduce the roughness from inhalable aerosols.

[0164] According to the sixth aspect, a method is provided for using a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness reducer to at least partially reduce the roughness from inhalable aerosols.

[0165] Preferably, the method is to partially reduce the perceived roughness of inhalable aerosols generated by the aerosol generating article of the third aspect or the aerosol generating system of the fourth aspect.

[0166] Of course, the characteristics described above for carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius apply to the sixth aspect.

[0167] As mentioned, the term "aerosol-generating article" refers to an aerosol-generating article intended to generate aerosols. Aerosol-generating articles can refer to heat-not-burn articles, wherein the aerosol-generating matrix is ​​intended to be heated rather than burned to release volatile compounds that can form aerosols, or to conventional cigarettes.

[0168] As mentioned, the term "aerosol generating matrix" is used to describe a matrix containing aerosol generating materials that can release volatile compounds that can generate aerosols when heated.

[0169] As mentioned, the term "aerosol" is used to describe a dispersion of solid particles or droplets, or a combination of solid particles and droplets, in a gas. Aerosols can be visible or invisible. Aerosols can include vapors of substances that are typically liquid or solid at room temperature, as well as solid particles or droplets, or a combination of solid particles and droplets.

[0170] As mentioned, the term "aerosol forming agent" refers to a component that, when heated to a temperature above a specific volatilization temperature of the aerosol-generating material, can volatilize and deliver desired substances, such as nicotine and / or flavorings, into the aerosol. An aerosol forming agent can be any suitable compound or mixture of compounds that facilitates the formation of a dense and stable aerosol during use and is highly resistant to thermal degradation at the operating temperature of heated aerosol-generating articles. Different aerosol forming agents volatilize at different temperatures. Therefore, an aerosol forming agent can be selected based on its ability to remain stable at or near room temperature but volatilize at higher temperatures, such as 40 to 450 degrees Celsius.

[0171] As used, the term "p" K a " is the acid dissociation constant of the solution ( K a The negative logarithm of acid to the base 10, and is used to describe the strength of acid.

[0172] As stated, the term "boiling point" refers to the temperature at which the vapor pressure of a liquid is equal to the pressure surrounding the liquid and the liquid turns into vapor, measured at 1 atmosphere.

[0173] As mentioned, the "vapor pressure" of a liquid is the equilibrium pressure of the vapor above the liquid; that is, the pressure of the vapor produced by the evaporation of the liquid above a liquid sample in a closed container.

[0174] As mentioned, the term "carboxylic acid" is used to describe organic compounds that contain a carboxyl group. That is, a carboxylic acid is a compound that contains a -COOH group attached to one of the atoms in the compound.

[0175] As stated, the term "aliphatic carboxylic acid" is used to describe carboxylic acid compounds that do not contain aromatic structures. Aliphatic carboxylic acids can be saturated or unsaturated. Aliphatic carboxylic acids can be straight-chain or branched.

[0176] As stated, the term "aromatic carboxylic acid" is used to describe compounds containing an aromatic structure and a -COOH group. The -COOH group may be directly attached to the aromatic structure, or it may be attached to another atom present in the compound.

[0177] As mentioned, the term "monocarboxylic acid" is used to describe a carboxylic acid that contains a single carboxyl group attached to a carbon atom in the carboxylic acid compound. That is, a carboxylic acid containing a -COOH group attached to a carbon atom.

[0178] As stated, the term "gemonic dicarboxylic acid" is used to describe a carboxylic acid containing two carboxyl groups attached to the same carbon atom. That is, a carboxylic acid containing two -COOH groups attached to the same carbon atom. Gemonic dicarboxylic acids can also be called gemonic-dicarboxylic acids.

[0179] As mentioned, the term "non-geminal dicarboxylic acid" is used to describe a carboxylic acid that contains two carboxyl groups attached to two different carbon atoms. That is, a carboxylic acid that contains two -COOH groups attached to two different carbon atoms.

[0180] As used, “plant material” means any substance or material derived from or part of a plant, including but not limited to leaves, stems, seeds, flowers, fruits, roots or bark.

[0181] Referring to this invention, the term "tobacco" describes any plant member of the genus Nicotiana.

[0182] The term "tobacco material" is used to refer to any plant material containing tobacco, including but not limited to tobacco leaves, tobacco ribs, tobacco stems and tobacco stalks.

[0183] The term "non-tobacco plant material" is used to refer to plant material that does not contain tobacco. Therefore, non-tobacco plant material is substantially free of tobacco (e.g., a tobacco-free material contains less than 1% by weight of tobacco, preferably less than 0.5% by weight of tobacco, and even more preferably less than 0.1% by weight of tobacco) or contains no measurable amount of tobacco. Examples of non-tobacco plant materials include plant-derived plant materials such as, but not limited to, cloves, star anise, rosemary, peppermint, sage, chamomile, and lavender.

[0184] As used, the term "shredded filler" describes a blend of shredded plant material (such as tobacco plant material), particularly including one or more of leaves, processed stems and ribs, and homogenized plant material. In the production of shredded fillers, the shredded plant material is typically conditioned by applying an aerosol-forming agent and steam, and then the conditioned plant material is dried to a defined moisture level. Shredded fillers may also contain other post-cut filler tobaccos or additives, which are typically combined with the dried, conditioned plant material in a post-cutting drum. For the purposes of this invention, the term "shredded filler" refers to shredded plant material that has undergone conditioning and drying steps and has been combined with post-cutting and any other additives in a post-cutting drum.

[0185] As mentioned, the term "nicotine" is used to describe nicotine, nicotine base, or nicotine salt.

[0186] As stated, the term "flavoring agent" is used to refer to a chemical compound that provides a desired flavor or aroma. Examples of flavoring agents include, but are not limited to, vanillin, linalool, menthol, guaiacol, thymol, coumarin, eugenol, cinnamaldehyde, and geraniol.

[0187] As described above, the term "aerosol generating apparatus" is used to describe an apparatus that interacts with an aerosol generating matrix of an aerosol generating article to generate aerosols. Specifically, the term "aerosol generating apparatus" is used to describe an apparatus that heats an aerosol generating matrix of an aerosol generating article to generate aerosols.

[0188] As used herein, "dry weight" refers to the weight of a specific non-aqueous component relative to the total weight of all non-aqueous components in a mixture, expressed as a percentage. The composition of an aqueous mixture can be expressed as "dry weight percentage." This refers to the weight of the non-aqueous component relative to the entire aqueous mixture, expressed as a percentage.

[0189] As used, the term "sheet" refers to a planar element whose length and width are sufficiently greater than its thickness. A sheet extends substantially in a plane. The length and width of a sheet may be at least 500 times its thickness. The length and width of a sheet may be at least 1000 times its thickness. A sheet may have a rectangular shape. A sheet may have an elongated rectangular shape. A sheet may be a strip.

[0190] The sheet can be a continuous sheet. As used herein, the term "continuous sheet" refers to a sheet whose length is sufficiently greater than its width. Continuous sheets can be supplied on rolls.

[0191] As used herein, the term "sheet length" refers to the spatial extent of the sheet along its longitudinal axis. Preferably, the sheet length is constant. The term "sheet width" refers to the spatial extent of the sheet along an axis perpendicular to the sheet's longitudinal axis. As used herein, the term "predetermined width" refers to the width of the sheet before further processing, such as before the sheet is rolled or embossed and / or before the sheet is assembled. Preferably, the sheet width is constant along the sheet's longitudinal axis. The sheet's length and width extend in a plane. The term "sheet thickness" refers to the spatial extent of the sheet along an axis perpendicular to the plane in which the sheet's length and width extend. Preferably, the sheet thickness is constant.

[0192] As used, the terms "aggregate" or "aggregated" refer to the formation of a sheet, rolled sheet, or embossed sheet of cellulosic filter material into a predetermined shape, such as a strip. The sheet may be wound substantially transverse to its central longitudinal axis or otherwise compressed or contracted into a strip form. The sheet of cellulosic filter material may be aggregated in an aggregating device. The sheet of cellulosic filter material can be aggregated into a filter strip by passing it through a converging funnel. The converging funnel can gradually aggregate the sheet of cellulosic filter material into a strip shape. The sheet of cellulosic filter material can be aggregated into a filter strip by passing rolled or embossed sheets of cellulosic filter material through a converging funnel. The converging funnel can gradually aggregate the rolled or embossed sheets of cellulosic filter material into a strip shape.

[0193] As used, the terms "crimped" or "crimping" refer to the process of forming multiple corrugations on a sheet of cellulosic filter material. Crimping can be performed using a pair of crimping rollers. Corrugations on the sheet can be formed by the crimping rollers. The crimping rollers may include corrugations on their surface. The sheet of cellulosic filter material can be crimped before the sheet is assembled. In other words, crimped sheets of cellulosic filter material can be assembled.

[0194] As used, the term "corrugation" refers to multiple ridges formed by alternating peaks and valleys connected by corrugated sides. This includes, but is not limited to, corrugations having a square wave profile, a sinusoidal wave profile, a triangular profile, a sawtooth profile, or any combination thereof. Corrugations can be defined on rollers, such as crimping rollers, or on sheets. Corrugations on rollers refer to multiple ridges formed on the outer surface of the roller. When a sheet is placed on a flat surface without stretching the sheet itself, corrugations on the sheet refer to multiple ridges.

[0195] As used, a "curling roller" is a roller used for curling sheets. A curling roller defines an outer surface and a rotation axis. The outer surface includes multiple corrugations.

[0196] Crimping improves control over how cellulosic filter media sheets are aggregated. Crimping provides improved control over filter bar porosity. Crimping improves control over filter bar airflow characteristics. Crimping improves the visual appearance of the filter bar. Crimping improves control over the filter bar's suction resistance (RTD).

[0197] As used, the terms "embossed," "embossment," or "embossing" refer to protrusions formed in the surface of a sheet of cellulosic filter material. The sheet can be embossed by a pair of opposing rotating shaped embossing rollers. The sheet passes through the gap between the rollers and conforms to their contours. The embossing rollers apply an embossing pattern to the sheet. The embossing rollers may have a contour comprising multiple small square-bottomed pyramids.

[0198] Embossing improves control over how cellulosic filter media sheets are aggregated. Embossing provides improved control over filter bar porosity. Embossing improves control over filter bar airflow characteristics. Embossing improves the visual appearance of filter bars. Embossing improves control over filter bar suction resistance (RTD).

[0199] As used, the term "perimeter" of an object refers to the total length of the lines that encircle a cross-section of the object's outer surface. In other words, perimeter refers to the outer circumference of an object. Perimeter can be the circumference of a circle.

[0200] As used, "length of filter bar" refers to the spatial extent of the filter bar along its longitudinal axis.

[0201] The invention is defined in the claims. However, a non-exhaustive list of non-limiting examples is provided below. Any one or more features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0202] Example Ex1. An aerosol generation matrix for use in an aerosol generation system, the aerosol generation matrix comprising:

[0203] Filler containing shredded plant material.

[0204] Aerosol forming agents, and

[0205] A roughness reducing agent, wherein the roughness reducing agent is composed of a carboxylic acid, wherein the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius.

[0206] Example Ex2. The aerosol generating matrix according to Example Ex1, wherein the carboxylic acid has a vapor pressure of 0.005 to 0.95 Torr at 25 degrees Celsius.

[0207] Example Ex3. An aerosol generating matrix according to any one of Examples Ex1 to Ex2, wherein the carboxylic acid has a vapor pressure of 0.01 to 0.90 Torr at 25 degrees Celsius.

[0208] Example Ex4. An aerosol generating matrix according to any one of Examples Ex1 to Ex3, wherein the carboxylic acid has a vapor pressure of 0.012 to 0.85 Torr at 25 degrees Celsius.

[0209] Example Ex5. An aerosol generating matrix according to any one of Examples Ex1 to Ex4, wherein the carboxylic acid has a pKa of 3.20 to 5.50 in water at 25 degrees Celsius.

[0210] Example Ex6. An aerosol generating matrix according to any one of Examples Ex1 to Ex5, wherein the carboxylic acid has a pKa of 3.25 to 5.30 in water at 25 degrees Celsius.

[0211] Example Ex7. An aerosol generating matrix according to any one of Examples Ex1 to Ex6, wherein the carboxylic acid has a pKa of 3.30 to 5.20 in water at 25 degrees Celsius.

[0212] Example Ex8. An aerosol generating matrix according to any one of Examples Ex1 to Ex7, wherein the carboxylic acid has a pKa of 3.35 to 5.15 in water at 25 degrees Celsius.

[0213] Example Ex9. An aerosol-generating matrix according to any one of Examples Ex1 to Ex8, wherein the pKa of the carboxylic acid is 3.4 to 4.50.

[0214] Example Ex10. An aerosol generating matrix according to any one of Examples Ex1 to Ex9, wherein the boiling point of the carboxylic acid is 150 to 310 degrees Celsius.

[0215] Example Ex11. An aerosol generating matrix according to any one of Examples Ex1 to Ex10, wherein the boiling point of the carboxylic acid is 160 to 270 degrees Celsius.

[0216] Example Ex12. An aerosol generating matrix according to any one of Examples Ex1 to Ex11, wherein the boiling point of the carboxylic acid is 170 to 260 degrees Celsius.

[0217] Example Ex13. An aerosol generating matrix according to any one of Examples Ex1 to Ex12, wherein the boiling point of the aerosol-generated carboxylic acid is 180 to 255 degrees Celsius.

[0218] Example Ex14. An aerosol-generating matrix according to any one of Examples Ex1 to Ex13, wherein the carboxylic acid does not decompose at or below its boiling point.

[0219] Example Ex15. An aerosol generating matrix according to any one of Examples Ex1 to Ex14, wherein the aerosol generating matrix is ​​stable for decarboxylation at a temperature above 300 degrees Celsius and below 450 degrees Celsius.

[0220] Example Ex16. An aerosol-generating matrix according to any one of Examples Ex1 to Ex15, wherein the carboxylic acid is a monocarboxylic acid.

[0221] Example Ex17. An aerosol generating matrix according to any one of Examples Ex1 to Ex16, wherein the carboxylic acid is an aliphatic carboxylic acid.

[0222] Example Ex18. An aerosol generating matrix according to any one of Examples Ex1 to Ex17, wherein the carboxylic acid has a chain length of 3 to 8 carbon atoms.

[0223] Example Ex19. An aerosol generating matrix according to any one of Examples Ex1 to Ex18, wherein the carboxylic acid is selected from lactic acid, levulinic acid, succinic acid, crotonic acid, sorbic acid, trans-2-hexenoic acid, 3-hexenoic acid, 2-ethylbutyric acid, hexanoic acid, benzoic acid, 5-methyl-2-furonic acid, and cyclohexanecarboxylic acid.

[0224] Example Ex20. An aerosol-generating matrix according to any one of Examples Ex1 to 19, wherein the carboxylic acid is lactic acid, levulinic acid, or crotonic acid.

[0225] Example Ex21. An aerosol-generating matrix according to any one of Examples Ex1 to 20, wherein the carboxylic acid is an α-hydroxycarboxylic acid.

[0226] Example Ex22. An aerosol-generating matrix according to any one of Examples Ex1 to 21, wherein the carboxylic acid is lactic acid.

[0227] Example Ex23. An aerosol generating matrix according to any one of Examples Ex1 to Ex22, wherein the carboxylic acid is configured to directly protonate nicotine in an aerosol generated by heating the aerosol generating matrix.

[0228] Example Ex24. An aerosol generating matrix according to any one of Examples Ex1 to Ex23, wherein the carboxylic acid is present at 0.1 to 10% by weight, preferably 0.5 to 7.5% by weight, preferably 0.75 to 5% by weight, and preferably 1.0 to 3% by weight, on a dry weight basis.

[0229] Example Ex25. An aerosol-generating matrix according to any one of Examples Ex1 to Ex24, wherein the matrix comprises a single roughness-reducing agent.

[0230] Example Ex26. An aerosol generating matrix according to any one of Examples Ex1 to Ex25, wherein the aerosol generating matrix does not contain geminal dicarboxylic acids.

[0231] Example Ex27. An aerosol generating matrix according to any one of Examples Ex1 to Ex26, wherein the matrix is ​​a solid aerosol generating matrix.

[0232] Example Ex28. An aerosol-generating matrix according to any one of Examples Ex1 to Ex27, wherein the chopped plant material comprises tobacco material.

[0233] Example Ex29. An aerosol-generating matrix according to any one of Examples Ex1 to Ex28, wherein the chopped plant material is composed of tobacco material.

[0234] Example Ex30. An aerosol generating matrix according to any one of Examples Ex1 to Ex29, wherein the tobacco material comprises or is composed of one or more of tobacco leaves, tobacco ribs, tobacco stems and tobacco stalks.

[0235] Example Ex31. An aerosol generating matrix according to any one of Examples Ex1 to Ex30, wherein the tobacco material comprises at least 25% by weight chopped tobacco leaves.

[0236] Example Ex32. An aerosol-generating matrix according to any one of Examples Ex1 to Ex31, wherein the chopped plant material comprises non-tobacco plant material.

[0237] Example Ex33. An aerosol-generating matrix according to any one of Examples Ex1 to Ex27, wherein the chopped plant material is composed of non-tobacco plant material.

[0238] Example Ex34. An aerosol generating matrix according to any one of Examples Ex32 to 33, wherein the shredded non-tobacco plant material comprises one or more of non-tobacco plant leaves, stems, seeds, roots, bark, flowers, and rib fragments, or is composed of such materials.

[0239] Example Ex35. An aerosol generating matrix according to any one of Examples Ex32 to 34, wherein the non-tobacco plant material comprises one or more of tea, coffee, star anise, lavender, clove, peppermint, chamomile, rosemary, eucalyptus, ginger, dill seeds, thyme, oregano, and cumin, or composed thereof.

[0240] Example Ex36. An aerosol-generated matrix according to any one of Examples Ex1 to Ex35, wherein the matrix contains nicotine.

[0241] Example Ex37. An aerosol generating matrix according to any one of Examples Ex1 to Ex36, wherein the total nicotine content is 0.5 to 5% by weight on dry weight, preferably 1% to 4% by weight on dry weight, and more preferably 1.5% to 3% by weight on dry weight.

[0242] Example Ex38. An aerosol generating matrix according to any one of Examples Ex1 to Ex37, wherein the matrix comprises 50 to 95% by weight of the shredded filler, preferably 60 to 90% by weight of the shredded filler, preferably 70 to 85% by weight of the shredded filler, on a dry weight basis.

[0243] Example Ex39. An aerosol generating matrix according to any one of Examples Ex1 to Ex38, wherein the aerosol forming agent comprises or consists of propylene glycol, triethylene glycol, 1,3-butanediol, glycerol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, dimethyl dodecanoate, and dimethyl tetradecanoate.

[0244] Example Ex40. An aerosol generating matrix according to any one of Examples Ex1 to Ex39, wherein the aerosol generating matrix comprises at least 10% by weight of an aerosol forming agent on a dry weight basis, preferably at least 12% by weight of an aerosol forming agent, more preferably at least 15% by weight of an aerosol forming agent on a dry weight basis.

[0245] Example Ex41. An aerosol generating matrix according to any one of Examples Ex1 to Ex40, wherein the aerosol generating matrix comprises less than or equal to 40% by weight of aerosol forming agent on a dry weight basis, preferably less than or equal to 30% by weight of aerosol forming agent, more preferably less than or equal to 25% by weight of aerosol forming agent, and more preferably less than or equal to 20% by weight of aerosol forming agent.

[0246] Example Ex42. An aerosol-generating matrix according to any one of Examples Ex1 to 41, wherein the chopped plant material is impregnated with an aerosol-forming agent.

[0247] Example Ex43. An aerosol generating matrix according to any one of Examples Ex1 to Ex42, wherein the aerosol forming agent is disposed as a coating on the surface of the shredded plant material.

[0248] Example Ex44. An aerosol-generated matrix according to any one of Examples Ex1 to Ex43, wherein the matrix contains a flavoring agent.

[0249] Example Ex45. The aerosol generating matrix according to Example Ex44, wherein the flavoring agent comprises one or more of or consists of menthol, peppermint oil, γ-octanolactone, vanillin, ethyl vanillin, methyl salicylate, linalool, bergamot oil, geranium oil, ginger oil, and lemon oil.

[0250] Example Ex46. An aerosol generating matrix according to any one of Examples Ex1 to Ex45, wherein the chopped plant material comprising tobacco material or composed of tobacco material has an average cut width between 0.75 mm and 2 mm, preferably between 0.8 mm and 1.75 mm, preferably between 0.85 mm and 1.5 mm, preferably between 0.9 mm and 1.25 mm, and particularly preferably about 1 mm.

[0251] Example Ex47. An aerosol-generating matrix according to any one of Examples Ex1 to 46, wherein the chopped plant material comprising or composed of non-tobacco plant material may have a cut width between 0.1 mm and 0.5 mm, or between 0.15 mm and 0.45 mm, or between 0.2 mm and 0.39 mm.

[0252] Example Ex48. A method for manufacturing an aerosol-generating matrix according to any one of Examples Ex1 to Ex47, wherein the method comprises:

[0253] - Provide plant materials;

[0254] - Conditioning the plant material, wherein the conditioning includes applying an aerosol forming agent to the plant material;

[0255] - Apply a roughness-reducing agent to the plant material, wherein the roughness-reducing agent is composed of a carboxylic acid and the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius;

[0256] - Cut the plant material to provide shredded plant material, and

[0257] - Perform a drying step to provide shredded filler with a defined moisture level.

[0258] Example Ex49. A method for manufacturing the aerosol generating matrix according to Example Ex48, wherein the conditioning step includes applying a mixture of the aerosol forming agent and steam to the plant material.

[0259] Example Ex50. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex48 to Ex49, wherein the roughness reducing agent is applied to the plant material as a mixture with the aerosol forming agent during the conditioning step.

[0260] Example Ex51. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex48 to Ex49, wherein the roughness reducing agent and the aerosol forming agent are sequentially applied to the shredded plant material during the conditioning step.

[0261] Example Ex52. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex48 to Ex49, wherein the roughness reducing agent is applied to the plant material after the conditioning step.

[0262] Example Ex53. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex48 to Ex49 and according to Example Ex52, wherein the roughness reducing agent is applied to the plant material after the drying step.

[0263] Example Ex54. A method for manufacturing the aerosol-generating matrix according to Examples Ex48 and Ex53, wherein an additional drying step is performed after the roughness-reducing agent is applied to the plant material.

[0264] Example Ex55. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex52 to Ex54, wherein the roughness reducer is applied to the plant material as a mixture with a flavoring agent.

[0265] Example Ex56. A method for manufacturing the aerosol generating matrix according to any one of Examples Ex52 to Ex54, wherein the roughness reducing agent is applied to the plant material before or after the flavoring agent has been applied to the plant material.

[0266] Example Ex57. An aerosol generating article for use in an aerosol generating system, the aerosol generating article comprising an aerosol generating matrix according to any one of Examples Ex1 to Ex47.

[0267] Example Ex58. An aerosol generating article according to Example Ex57, wherein the aerosol generating article includes an upstream element located at a distal end of the aerosol generating article.

[0268] Example Ex59. An aerosol generating article according to any one of Examples Ex57 to Ex58, wherein the aerosol generating article includes a support element located between the aerosol generating matrix and the proximal end of the aerosol generating article.

[0269] Example Ex60. An aerosol generating article according to any one of Examples Ex57 to Ex59, wherein the aerosol generating article includes an aerosol cooling element located between the aerosol generating matrix and a proximal end of the aerosol generating article.

[0270] Example Ex61. An aerosol generating article according to any one of Examples Ex57 to Ex60, wherein the aerosol generating article includes a mouthpiece element located at a proximal end of the aerosol generating article.

[0271] Example Ex62. An aerosol generating article according to Example Ex61, wherein the mouthpiece element includes a filter element.

[0272] Example Ex63. An aerosol generating article according to Example Ex62, wherein the filter element includes a filter strip, preferably wherein the filter strip of the filter element is composed of aggregated crimped sheets of cellulose-based filter material or aggregated embossed sheets of cellulose-based filter material.

[0273] Example Ex64. An aerosol-generating article according to Example Ex63, wherein the cellulose-based filter material is a paper material.

[0274] Example Ex65. An aerosol-generating article according to any one of Examples Ex63 to Ex64, wherein the cellulosic filter material comprises one or both of cellulose fibers and regenerated cellulose fibers.

[0275] Example Ex66. An aerosol generating article according to Example Ex65, wherein the cellulose-based filter material comprises at least 70% by weight of cellulose fibers, optionally wherein the cellulose-based filter material comprises at least 85% by weight of cellulose fibers, optionally wherein the cellulose-based filter material comprises at least 90% by weight of cellulose fibers.

[0276] Example Ex67. An aerosol-generating article according to any one of Examples Ex65 to Ex66, wherein the cellulosic filter material comprises fibers selected from: cellulose fibers, viscose fibers, rayon fibers, modal fibers, Tencel fibers, lyocell fibers, cellophane, parchment paper, and any combination thereof.

[0277] Example Ex68. An aerosol generating article according to any one of Examples Ex62 to Ex70, wherein the filter element comprises an additive for reducing one or more of phenols or cresols, preferably wherein the additive is selected from polyethylene glycol (PEG), glyceryl triacetate (TA), and triethyl citrate (TEC).

[0278] Example Ex69. An aerosol-generating article according to any one of Examples Ex63 to Ex68, wherein the longitudinal axis of the sheet of the cellulosic filter material is parallel to the longitudinal axis of the filter strip.

[0279] Example Ex70. An aerosol generating article according to any one of Examples Ex65 to Ex71, wherein at least a portion of the filter strip is defined by a sheet of packaging material, preferably a paper packaging material, such as stick packaging and / or tipping paper.

[0280] Example Ex71. An aerosol generating article according to any one of Examples Ex57 to Ex70, wherein the aerosol generating article includes a sensor.

[0281] Example Ex72. An aerosol generating article according to Example Ex71, wherein the receptor is in direct contact with the aerosol generating matrix.

[0282] Example Ex73. An aerosol generation system, the aerosol generation system comprising:

[0283] Aerosol-generated articles according to any one of Examples Ex57 to Ex72; and

[0284] An aerosol generating apparatus configured to heat the aerosol generating matrix of the aerosol generating article.

[0285] Example Ex75. Use of carboxylic acids having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness reducer.

[0286] Example Ex76. According to the application of Example Ex75, for at least partially reducing the roughness of aerosols, more preferably inhalable aerosols.

[0287] Example Ex77. For use in any of Examples Ex75 to Ex76, in an aerosol generating matrix according to any one of Examples Ex1 to Ex47 to at least partially reduce the roughness of inhalable aerosols from heated aerosol generating articles according to any one of Examples Ex57 to Ex72 or heated aerosol generating systems according to Example Ex73.

[0288] Example Ex78. For the purpose of any of Examples Ex75 to Ex77, to improve the odor profile of inhalable aerosols.

[0289] Example Ex79. For the purpose of any of Examples Ex75 to Ex78, to enhance the taste experience of the inhalable aerosol.

[0290] Example Ex80. A method for at least partially reducing the roughness of inhalable aerosols by using a carboxylic acid having a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius as a roughness reducer.

[0291] Example Ex81. The method according to Example Ex80 includes at least partially reducing the perceived roughness of inhalable aerosols generated from any one of the aerosol generating articles of Examples Ex57 to Ex72 or the aerosol generating system of Example Ex73.

[0292] Example 1

[0293] A reference aerosol generating matrix comprising shredded tobacco filler was prepared according to conventional methods known in the art. The reference aerosol generating matrix comprised approximately 82% by weight of tobacco shredded filler and 18% by weight of glycerol on a dry weight basis.

[0294] Sample 1 is an aerosol-generating matrix containing shredded tobacco filler, comprising approximately 81.4% by weight of tobacco shredded filler, 17.9% by weight of glycerol, and 0.7% by weight of lactic acid on a dry weight basis. Lactic acid was applied to the matrix by injection to form Sample 1.

[0295] Sample 1 and the reference aerosol generation matrix sample were each heated to a temperature between 250°C and 260°C to generate inhalable aerosols.

[0296] An eight-member evaluation panel assessed the intensity of mouth and throat roughness as a function of the number of inhalations during a nine-puff inhalation process for inhalable aerosols generated by heating Sample 1 and a reference aerosol generating matrix.

[0297] The evaluation team members rated the intensity of the roughness in the mouth and throat perceived with each puff from zero to ten. A value of ten represented high intensity and high perceived sensory roughness, while a value of zero represented no intensity and no sensory roughness. The ratings for each puff were then averaged.

[0298] It was found that the presence of lactic acid in Sample 1 advantageously led to a reduction in the perceived intensity of mouth and throat roughness compared to that perceived from inhalable aerosols generated by heating a reference sample.

[0299] Therefore, it has been found that the aerosol-generating matrix according to the present invention can effectively reduce perceived sensory roughness and mouth and throat irritation.

[0300] Example 2

[0301] A reference aerosol generating matrix containing shredded filler was prepared in the same manner as the reference sample described above in conjunction with Example 1.

[0302] Sample 2 is an aerosol-generating matrix containing shredded tobacco filler, comprising approximately 80.7% by weight of tobacco shredded filler, 17.7% by weight of glycerol, and 1.6% by weight of lactic acid on a dry weight basis. Lactic acid was applied to the matrix by injection to form Sample 2.

[0303] Sample 2 and the reference sample were each heated to a temperature between 250°C and 260°C to generate inhalable aerosols.

[0304] An eight-member evaluation panel assessed the intensity of mouth and throat roughness as a function of the number of inhalations during a nine-puff inhalation process for inhalable aerosols generated by heating Sample 2 and the reference aerosol generating matrix.

[0305] The evaluation team members rated the intensity of the roughness in the mouth and throat perceived with each puff from zero to ten. A value of ten represented high intensity and high perceived sensory roughness, while a value of zero represented no intensity and no sensory roughness. The ratings for each puff were then averaged.

[0306] It was found that the presence of lactic acid in Sample 2 advantageously led to a reduction in the perceived intensity of mouth and throat roughness compared to that perceived from inhalable aerosols generated by heating a reference sample.

[0307] Therefore, it has been found that the aerosol-generating matrix according to the present invention can effectively reduce perceived sensory roughness and mouth and throat irritation.

[0308] Furthermore, it was found that the average intensity felt during each of the first three puffs of Sample 2 was lower than that felt during each of the first three puffs of Sample 1. Therefore, a higher amount of roughness reducer in the aerosol-generating matrix can further reduce the roughness and mouth and throat irritation felt during the earlier puffs of aerosol-generating articles.

[0309] Example 3

[0310] To evaluate the effect of roughness-reducing agents on nicotine delivery from aerosol-generated matrix.

[0311] A reference aerosol generating matrix containing shredded filler was prepared in the same manner as described above in conjunction with Examples 1 and 2.

[0312] An aerosol-generating matrix comprising shredded tobacco filler was prepared, containing approximately 80.7 wt% tobacco shredded filler, 17.7 wt% glycerol, and 1.6 wt% lactic acid on a dry weight basis. Lactic acid was applied to the matrix by injection to form Sample 3.

[0313] Another aerosol-generating matrix was prepared, comprising approximately 80.7 wt% tobacco shredded filler, 17.7 wt% glycerol, and 1.6 wt% lactic acid on a dry weight basis. Lactic acid was applied to the sample using a spraying method to form sample 4. The spraying method is familiar to those skilled in the art.

[0314] The reference sample, sample 3, and sample 4 were each heated to generate inhalable aerosols. The aerosols were captured and analyzed by gas chromatography, and the nicotine content in each aerosol generated by heating the reference sample, sample 3, and sample 4 was determined.

[0315] It was found that the nicotine content in the aerosols generated from samples 3 and 4, each containing a roughness-reducing agent, was comparable to the nicotine content in the aerosols generated by heating a reference aerosol-generating matrix that did not contain a roughness-reducing agent.

[0316] Therefore, it has been advantageously found that the matrix according to the invention can effectively reduce sensory roughness and oral and throat irritation without impairing the delivery of nicotine to the user.

[0317] Example 4

[0318] The content of roughness reducers in aerosols generated by heating the aerosol-generating matrix was evaluated, and the transfer yield of roughness reducers from the matrix to the aerosol was calculated.

[0319] A reference aerosol generation matrix was prepared for testing. The reference sample in this example was a tobacco-free cast leaf aerosol generation matrix containing 3.72 wt% lactic acid and 1.5 wt% exogenous nicotine.

[0320] Sample 5 was prepared as an aerosol-generating matrix containing shredded tobacco filler. Sample 5 contained approximately 81.4 wt% tobacco shredded tobacco filler, 17.9 wt% glycerol, and 0.7 wt% lactic acid on a dry weight basis.

[0321] Sample 6 was prepared as an aerosol-generating matrix containing shredded filler. This aerosol-generating matrix containing shredded filler comprises approximately 80.7% by weight of tobacco shredded filler, 17.7% by weight of glycerol, and 1.6% by weight of lactic acid on a dry weight basis.

[0322] The reference sample, sample 5, and sample 6 were each heated to generate aerosols. The aerosols generated from each sample were captured and analyzed using ion chromatography, and the lactic acid content in each aerosol was determined.

[0323] The lactic acid content measured in each aerosol will be compared with the initial lactic acid content in each matrix, and then the transfer yield will be calculated.

[0324] The transfer yield of lactic acid was found to be 12.2% for sample 5 and 12.4% for sample 6.

[0325] In contrast, the transfer yield of lactic acid in the reference sample was found to be 3.3%.

[0326] Therefore, it has been advantageously found that, compared with prior art aerosol generating matrices, the matrix according to the invention has an improved transfer yield of the roughness reducing agent from the matrix to the aerosol.

[0327] Advantageously, and without wishing to be bound by theory, the aerosols generated by this invention exhibit a higher lactic acid transfer yield than aerosols generated from prior art aerosol-generating matrices. Therefore, the aerosols contain a higher proportion of lactic acid available for nicotine protonation, which can lead to a reduction in sensory roughness and mouth and throat irritation.

[0328] Example 5

[0329] Aerosol-generated products were prepared.

[0330] A reference aerosol generating article was prepared, comprising a filter element made of cellulose acetate and an aerosol generating matrix containing shredded filler.

[0331] Sample 1 was prepared, which includes a filter element formed of a cellulose-based nonwoven material and an aerosol-generating matrix containing shredded filler.

[0332] Sample 2 was prepared, which contained a filter element formed of cellulose-based paper material and an aerosol-generating matrix containing shredded filler.

[0333] Sample 3 was prepared, comprising a filter element made of the same cellulose-based paper material as Sample 2, and an aerosol-generating matrix containing shredded filler and lactic acid. Lactic acid was included in the matrix at 0.15% (1.5 kg lactic acid / 1 ton of tobacco, applied during the light tobacco feeding stage).

[0334] The sensory properties of each aerosol-generated product were tested by the evaluation panel. Approximately 108 evaluation panel members tested the reference sample, 110 evaluation panel members tested Sample 1, 107 evaluation panel members tested Sample 2, and 110 evaluation panel members tested Sample 3.

[0335] Compared with Sample 1 and Sample 2, Sample 3 was found to have an improved overall experience and an improved overall taste profile.

[0336] Compared with reference samples including shredded filler and conventional cellulose acetate filters, Sample 3 was found to have an improved experience and taste profile in some aspects.

[0337] Sample 3 was evaluated as having a very satisfying taste experience, high product quality, a very pleasant aroma, and improved taste balance and aftertaste, indicating a reduction in sensory roughness perceived from the aerosol generated by Sample 3.

[0338] Sample 3, which includes a cellulose-based paper filter and a roughness reducer, can advantageously generate an inhalable aerosol with improved taste profile, reduced sensory roughness, and reduced environmental impact.

[0339] For the purposes of this specification and the appended claims, unless otherwise indicated, all figures representing quantities, quantities, percentages, etc., shall be understood to be modified by the term "about" in all cases. Furthermore, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges that may or may not be specifically listed herein. Thus, in this document, the number A is understood to be A ± 10% of A. In this document, the number A may be considered to be a value within the general standard error of the measurement of the property modified by the number A. In certain instances used in the appended claims, the number A may deviate from the percentages listed above, provided that the amount of deviation from A does not materially affect the essential and novel features of the claimed invention. Moreover, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges that may or may not be specifically listed herein.

Claims

1. An aerosol generation matrix for use in an aerosol generation system, the aerosol generation matrix comprising: Filler containing shredded plant material. Aerosol forming agents, and A roughness reducing agent, wherein the roughness reducing agent is composed of a carboxylic acid, wherein the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius.

2. The aerosol generating matrix according to claim 1, wherein the carboxylic acid has a pKa of 3.20 to 5.50 in water at 25 degrees Celsius.

3. The aerosol generating matrix according to any one of claims 1 to 2, wherein the boiling point of the carboxylic acid is 150 to 310 degrees Celsius.

4. The aerosol generating matrix according to any one of claims 1 to 3, wherein the aerosol generating matrix is ​​thermally decarboxylable at a temperature of 300 degrees Celsius or less.

5. The aerosol generating matrix according to any one of claims 1 to 4, wherein the carboxylic acid has a chain length of 3 to 8 carbon atoms.

6. The aerosol generating matrix according to any one of claims 1 to 5, wherein the carboxylic acid is selected from lactic acid, acetylpropionic acid, succinic acid, crotonic acid, sorbic acid, trans-2-hexenoic acid, 3-hexenoic acid, 2-ethylbutyric acid, hexanoic acid, benzoic acid, 5-methyl-2-furonic acid and cyclohexanecarboxylic acid.

7. The aerosol generating matrix according to any one of claims 1 to 6, wherein the carboxylic acid is lactic acid.

8. The aerosol generating matrix according to any one of claims 1 to 7, wherein the carboxylic acid is present in an amount of 0.1 to 10% by weight on a dry weight basis.

9. The aerosol generating matrix according to any one of claims 1 to 8, wherein the chopped plant material comprises tobacco material.

10. The aerosol generating matrix according to any one of claims 1 to 9, wherein the aerosol forming agent comprises propylene glycol, triethylene glycol, 1,3-butanediol, glycerol, glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, dimethyl dodecanoate, and dimethyl tetradecanoate, or is composed of the like.

11. The aerosol generating matrix according to any one of claims 1 to 10, wherein the aerosol generating matrix comprises at least 10% by weight of an aerosol forming agent on a dry weight basis, preferably at least 12% by weight of an aerosol forming agent, more preferably at least 15% by weight of an aerosol forming agent on a dry weight basis.

12. The aerosol-generating matrix according to any one of claims 1 to 11, wherein the chopped plant material is impregnated with an aerosol-forming agent.

13. A method for manufacturing an aerosol-generating matrix according to any one of claims 1 to 12, wherein the method comprises: - Provide plant materials; - Conditioning the plant material, wherein the conditioning includes applying an aerosol forming agent to the plant material; - Apply a roughness-reducing agent to the plant material, wherein the roughness-reducing agent is composed of a carboxylic acid and the carboxylic acid has a vapor pressure of 0.001 to 1.00 Torr at 25 degrees Celsius; - Cut the plant material to provide shredded plant material, and - Perform a drying step to provide shredded filler with a defined moisture level.

14. An aerosol generating article for use in an aerosol generating system, the aerosol generating article comprising an aerosol generating matrix according to any one of claims 1 to 12.

15. An aerosol generation system, the aerosol generation system comprising: The aerosol-generating article according to claim 14; as well as An aerosol generating apparatus configured to heat the aerosol generating matrix of the aerosol generating article.

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