Aerosol generating article equipped with a layered wrapper

Abstract

To provide an aerosol-generating article including an aerosol-forming substrate and a laminated wrapper.SOLUTION: The aerosol-forming substrate contains a plant material cut filler. The plant material cut filler contains a plant lamina of at least 25 percent based on the total weight of the plant material. The aerosol-forming substrate further contains an aerosol-former of about 6 percent to about 20 percent. The laminated wrapper is at least partly wrapped around the aerosol-forming substrate. The laminated wrapper comprises a heat conductive layer and a heat insulating layer. The heat conductive layer and the heat insulating layer overlap along an axial direction of the aerosol-generating article.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an aerosol-generating article, an aerosol-generating device, and a method for manufacturing an aerosol-generating article.

Background Art

[0002] It is known to provide an aerosol-generating device for generating an inhalable aerosol. Such a device can heat an aerosol-forming substrate contained in an aerosol-generating article without burning the aerosol-forming substrate. The aerosol-generating article may have a rod shape for insertion into the heating chamber of the aerosol-generating device. The heating element may be disposed in or around the heating chamber to heat the aerosol-forming substrate after the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

[0003] Although the temperature required for such a device to release a reasonable amount of material to enable the formation of an acceptable aerosol is significantly lower than combustion, not all substrates are suitable for releasing a sufficient amount of material to form a proper aerosol at a predetermined temperature below the combustion temperature of the aerosol-forming substrate. Therefore, sophisticated aerosol-forming substrates have been developed to enable the release of material at low temperatures. Today, this is achieved, for example, by using a papermaking or casting process to convert tobacco leaves into an artificially homogenized tobacco sheet.

[0004] However, to enable the generation of an acceptable aerosol at a temperature below combustion, relatively large amounts of aerosol formers are often used, and typically, the lower the temperature, the more aerosol formers are required. The presence of large amounts of aerosol formers results in unintended consequences, particularly fouling of the wrapper of the aerosol-generating article.

[0005] Therefore, it is desirable to provide an aerosol generating article that has a simple structure and enables aerosol generation at low temperatures. Furthermore, it is desirable to provide a so-called "heat-non-combustible" article that has a more natural appearance and taste. [Overview of the project]

[0006] According to a first aspect of the present invention, an aerosol-generating article is provided comprising an aerosol-forming substrate and a laminated wrapper. The aerosol-forming substrate comprises a plant material cut filler, the plant material cut filler comprising at least 25 percent of plant laminas by weight of the plant material, and the aerosol-forming substrate further comprises about 6 percent to about 20 percent of aerosol-forming material. The laminated wrapper is at least partially wrapped around the aerosol-forming substrate. The laminated wrapper comprises a thermally conductive layer and a thermally insulating layer. The thermally conductive layer and the thermally insulating layer overlap along the axial direction of the aerosol-generating article.

[0007] Advantageously, using natural plant material laminas can achieve a more natural taste and appearance for aerosol-generating articles. The term "lamina" refers to the leaf blade portion of a plant without a stem.

[0008] The aerosol-forming substrate preferably contains cut filler. In this text, “cut filler” is used to refer to blends of finely cut plant material, particularly leaf laminas, processed stems and ribs, and homogenized plant material, such as those made into sheets using a casting or papermaking process. The cut filler may also contain other post-cut filler tobacco or casing. According to a preferred embodiment of the present invention, the cut filler contains at least 25 percent plant leaf laminas, more preferably at least 50 percent plant leaf laminas, even more preferably at least 75 percent plant leaf laminas, and most preferably at least 90 percent plant leaf laminas. The plant material is preferably one of tobacco, mint, tea, and clove, but the present invention is preferably equally applicable to other plant materials that have the ability to release a substance when heat is applied, which can then form an aerosol.

[0009] The tobacco plant material preferably includes one or more laminas from among bright tobacco laminas, dark tobacco, aromatic tobacco, and filler tobacco. Bright tobacco is generally tobacco with large, light-colored leaves. Throughout this specification, the term “bright tobacco” is used for hot-air-dried tobacco. Examples of bright tobacco include hot-air-dried tobacco from China, hot-air-dried tobacco from Brazil, hot-air-dried tobacco from the United States (such as Virginia tobacco), hot-air-dried tobacco from India, hot-air-dried tobacco from Tanzania, or other hot-air-dried tobacco from Africa. Bright tobacco is characterized by a high sugar-to-nitrogen ratio. From a sensory perspective, bright tobacco is a type of tobacco that, after drying, has a spicy and lively feel. According to the present invention, bright tobacco is tobacco having a reducing sugar content of about 2.5 percent to about 20 percent on a dry weight basis of the leaves, and a total ammonia content of less than about 0.12 percent on a dry weight basis of the leaves. Reducing sugars include, for example, glucose or fructose. Total ammonia includes, for example, ammonia and ammonium salts. Dark tobacco is tobacco that generally has large, dark-colored leaves. Throughout this specification, the term “dark tobacco” is used for air-dried tobacco. Furthermore, dark tobacco may be fermented. Tobacco used primarily for chewing tobacco, snuff, cigar tobacco, and pipe blends also falls into this category. Typically, these dark tobaccos may be air-dried and fermented. From a sensory perspective, dark tobacco is a type of tobacco that, after drying, has a smoky, dark cigar-like feel. Dark tobacco is characterized by a low sugar-to-nitrogen ratio. Examples of dark tobacco include Burley Malawi or other African Burley, dried dark Brazilian Galpao, and sun-dried or air-dried Indonesian Kasturi.According to the present invention, dark tobacco is tobacco having a reducing sugar content of less than approximately 5 percent by dry weight of the leaves and a total ammonia content of no more than approximately 0.5 percent by dry weight of the leaves. Aromatic tobacco is tobacco that often has small, light-colored leaves. Throughout this specification, the term “aromatic tobacco” is used in reference to other tobaccos with a high content of aromatic compounds, such as essential oils. From a sensory perspective, aromatic tobacco is a type of tobacco that, after drying, has a spicy and aromatic scent. Examples of aromatic tobaccos include Greek Orient, Orient Turkey, semi-orient tobaccos that have been heat-dried, US Burley such as Perique, Rustica, US Burley, or Maryland. Filler tobacco is not a specific tobacco type but includes tobacco types that are used in blends and are primarily used to complement other tobacco types that do not give the final product a particular characteristic aromatic orientation. Examples of filler tobacco are the stems, midribs, or petioles of other tobacco types. A specific example could be the hot-air-dried stems of the lower petioles of plants from Brazil.

[0010] However, using large quantities of natural leaves in cut fillers requires a large amount of aerosol-forming material, especially at low temperatures. The present invention provides a special wrapper that prevents the appearance of fouling caused by a high aerosol-forming material content. In particular, it has been found that thermally conductive materials, such as metals, are very effective in preventing the appearance of fouling. In this regard, it has been found that fouling can be conveniently prevented regardless of the orientation of the thermally conductive layer relative to the aerosol-forming substrate, that is, regardless of whether the thermally conductive layer faces toward the aerosol-forming substrate or away from it.

[0011] Furthermore, it has been found that the thermally conductive layer can conveniently contribute to the energy distribution within the aerosol-generating article. By providing a thermally conductive layer to the laminated wrapper, uniform heating of the aerosol-forming substrate of the aerosol-generating article can be achieved. In this regard, the aerosol-generating article can be used in conjunction with an aerosol generator, which will be described in more detail below. The aerosol generator may include a heating element for heating the aerosol-forming substrate of the aerosol-generating article. The heating element radiates heat for this purpose. By providing a thermally conductive layer to the laminated wrapper, the heat radiated by the heating element can be uniformly distributed throughout the laminated wrapper. Since the laminated wrapper is at least partially arranged around the aerosol-forming substrate, the thermally conductive layer can help in the uniform heating of the aerosol-generating substrate.

[0012] The thermal insulating layer can prevent heat from leaking from the aerosol-forming substrate to the surrounding aerosol-generating article. Furthermore, the thermal insulating layer can provide structural stability to the laminated wrapper. The thermal insulating layer can act as a support for the thermal insulating layer itself.

[0013] The combination of a thermally conductive layer and a thermally insulating layer is particularly beneficial for heating an aerosol-forming substrate from within an aerosol-generating article using, for example, a pin or blade. According to the present invention, the thermally conductive layer and the thermally insulating layer overlap along the axial direction of the aerosol-generating article. The axial direction is along the longitudinal axis of the aerosol-generating article. Typically, the aerosol-generating article may have a rod shape. In this case, the axial direction is along the extension of the rod. The term “overlapping” means that at least a portion of the laminated wrapper includes a thermally conductive layer disposed radially adjacent to the thermally insulating layer, and at least a different portion of the laminated wrapper includes only the thermally conductive layer or only the thermally insulating layer radially. In other words, at least a portion of the laminated wrapper includes only the thermally conductive layer or only the thermally insulating layer, and at least a different portion of the laminated wrapper includes both the thermally conductive layer and the thermally insulating layer. In further terms, a portion of the thermally conductive layer is not covered by the thermally insulating layer, or does not cover it, or both.

[0014] Advantageously, the present invention may be useful for the formation of aerosols in multiple different structures: - When the heat source is located within the aerosol-generating article (e.g., a heating blade or pin) and the metal layer faces the aerosol-generating substrate, the thermally conductive layer may absorb some of the heat radiated from the heat source, heating the aerosol-generating substrate nearby. This can create a smooth average temperature across the entire aerosol-generating substrate. - When the heat source is located within the aerosol-generating article (e.g., a heating blade or pin) and the metal layer faces the aerosol-generating substrate. Due to the high aerosol-forming content, the aerosol-forming material is likely to immerse the insulating layer, especially if it is made of paper, cotton, glass fiber, viscose or other similar material. This can then produce a wicking effect as the heat-conductive layer is heated and the aerosol-forming material drawn towards the heat-conductive layer vaporizes. - When the heat source is outside the aerosol-generating article and the metal layer faces the aerosol-generating substrate. In this structure as well, the thermally conductive layer can absorb heat from the heat source and radiate heat directly to the aerosol-forming substrate in contact with the thermally conductive layer. Thus, compared to embodiments without a thermally conductive layer, the heat is concentrated near the aerosol-forming substrate, and the heat must permeate from the heat source to the article, possibly through the corresponding paper wrapper. - When the heat source is located outside the aerosol-generating article and the metal layer faces the aerosol-generating substrate. This structure may have the same advantages as wicking described above, but with the additional advantage that the transfer of heat from the heat source to the heat-conducting layer is less likely to be interrupted.

[0015] Preferably, at least a portion of the laminated wrapper includes a thermally conductive layer. This portion of the laminated wrapper can be used for heating. This portion may also be called the heating region. In other words, this portion of the laminated wrapper may be positioned in close proximity to a heating element, which will be described in more detail below, so that this portion of the laminated wrapper can be optimally heated. Omitting or reducing the thermal insulation layer in this portion of the laminated wrapper has the advantage that heat can optimally reach the thermally conductive layer and the aerosol-forming substrate wrapped by the thermally conductive layer. Providing a thermal insulation layer in this portion of the laminated wrapper would prevent heat from optimally reaching the aerosol-forming substrate and the thermally conductive layer. However, providing thermal insulation layers in different portions of the laminated wrapper ensures that the heat transferred from the heating element to the thermally conductive layer and then to the aerosol-forming substrate remains within the aerosol-forming substrate of the aerosol-generating article. Preferably, the portion of the laminated wrapper containing the thermal insulation layer is positioned at a distance from the heating element compared to the portion of the laminated wrapper containing only the thermally conductive layer.

[0016] The laminated wrapper may be wrapped around the entire circumference of the aerosol-forming substrate of the aerosol-generating article. Alternatively, the laminated wrapper may not be wrapped completely around the aerosol-forming substrate, if desired. Thus, the laminated wrapper may only partially cover the periphery of the aerosol-forming substrate. An additional wrapper may be provided to package the aerosol-generating article. Specifically, if the laminated wrapper only partially covers the periphery of the aerosol-forming substrate, an additional wrapper may be provided to completely cover the aerosol-generating article.

[0017] The term "laminated" in relation to a wrapper means a wrapper in which at least two layers are permanently assembled together, preferably by heat, pressure, welding, or adhesive. The two layers are preferably a thermal insulating layer and a thermal conductive layer. A laminated wrapper may include further layers if desired. However, the thermal conductive layer is preferably disposed directly adjacent to the aerosol-forming substrate of the aerosol-generating article. The thermal insulating layer is preferably disposed directly adjacent to the thermal conductive layer. A laminated wrapper preferably consists of a thermal conductive layer and a thermal insulating layer.

[0018] The laminated wrapper may include at least one heating region, which is provided with or has reduced insulating layers. The heating region may also be called a heating spot. By providing only a thermally conductive layer to a portion of the laminated wrapper, a heating region is made possible in which heating energy can be optimally transferred to the thermally conductive layer and the aerosol-forming substrate inside the aerosol-generating article. Heat transfer from the outside of the aerosol-generating article to the aerosol-forming substrate may be assisted by the thermally conductive layer of the laminated wrapper within the heating region. Preferably, the laminated wrapper includes a thermally conductive layer and a thermally insulating layer adjacent to the heating region. Preferably, the thermally conductive layer is provided inside the thermally insulating layer. In other words, preferably, the thermally conductive layer is provided directly adjacent to the aerosol-forming substrate of the aerosol-generating article in the radial direction. Preferably, the thermally insulating layer is provided wrapped around the thermally conductive layer. Heat applied to the thermally conductive layer within the heating region may move axially within the thermally conductive layer. This heat also moves radially into the aerosol-forming substrate and into the aerosol-generating article provided therein. On the other hand, in a portion of the thermally conductive layer covered by a thermal insulating layer, the heat in the thermally conductive layer can be insulated by the thermal insulating layer. Therefore, the heat within the thermally conductive layer mainly moves inward in the axial and radial directions, but not outward in the radial direction.

[0019] A single heating region may be provided, where only a thermally conductive layer is provided to enclose the aerosol generating substrate. Alternatively, multiple heating regions may be provided. In each heating region, it is preferable that only a thermally conductive layer is provided to surround the aerosol generating substrate. Between heating regions, or in a portion of a laminated wrapper adjacent to a heating region, it is preferable that the laminated wrapper additionally includes a thermally insulating layer enclosing the thermally conductive layer. Multiple heating regions may be used for different heating regimes of the heating element of the aerosol generator, as will be described in more detail below with respect to the aerosol generator. Thus, multiple sections of the aerosol forming substrate may be heated simultaneously by multiple heating regions. Alternatively, or additionally, continuous heating of different heating regions may be achieved.

[0020] The heating region may have an annular shape. An annular shape means a shape that extends around the entire circumference of the aerosol-forming substrate. An annular shape means that in the heating region, the cylindrical outer section of the aerosol-forming substrate is surrounded by a laminated wrapper, more specifically, the thermally conductive layer of the laminated wrapper. Advantageously, the annular shape of the heating region achieves uniform ambient heating of the aerosol-forming substrate. In other words, it is preferable that the annular shape of the heating region can generate a ring-shaped heating region.

[0021] The thermally conductive layer may contain one or more of aluminum, tin, and copper. These materials have high thermal conductivity. Therefore, these materials can optimally transfer heat to the aerosol-forming substrate disposed inside the aerosol-generating article. Furthermore, axial heat transfer within the thermally conductive layer can be optimized by providing a material with high thermal conductivity. In addition, combustion of the aerosol-generating article can be prevented by these materials of the thermally conductive layer. In this regard, the aerosol-generating article according to the present invention can be used in a heating-non-combustion type device that heats an aerosol-forming substrate to produce an inhalable aerosol, but does not burn. Preventing combustion of the aerosol-forming substrate prevents the formation of undesirable aerosol components. Users may accidentally or intentionally ignite the aerosol-generating article. The material of the thermally conductive layer can prevent such undesirable ignition. In other words, the thermally conductive layer can be airtight. As a result, advantageously, the safe handling of the aerosol-generating articles of the present invention is improved, and the use of the aerosol-generating articles in unintended manner can be prevented.

[0022] A cut filler suitable for use with the present invention may generally be similar to a cut filler used in conventional smoking articles. The cut width of the cut filler is preferably 0.3 mm to 2.0 mm, more preferably 0.5 mm to 1.2 mm, and most preferably 0.6 mm to 0.9 mm. The cut width can play a role in the heat distribution inside the base portion of the article. The cut width can also play a role in the pull-out resistance of the article. Furthermore, the cut width can affect the overall density of the base portion.

[0023] Since the strand length depends on the overall size of the object from which the strand is cut, the strand length of cut filler is somewhat random. Nevertheless, longer strands can be cut by conditioning the material before cutting, for example, by controlling the moisture content and overall delicacy of the material. Preferably, the strands have a length of about 10 mm to about 40 mm before they are formed in the base section. Obviously, if the strands are arranged in a base section along the long axis where the extension portion in the long axis direction of the section is less than 40 mm, the final base section may contain strands that are, on average, shorter than the initial strand length. Preferably, the strand length of the cut filler is such that about 20 percent to 60 percent of the strand extends along the entire length of the base portion. This prevents the strands from easily coming off the base section.

[0024] In preferred embodiments, the weight of the aerosol-forming substrate is 80 to 400 milligrams, preferably 150 to 250 milligrams, and more preferably 170 to 220 milligrams. This amount of aerosol formation typically allows for sufficient material for aerosol formation. In addition, in light of the aforementioned constraints on diameter and size, this allows for a balanced density of the aerosol-forming substrate between the fluid passages within the substrate section containing the plant material, with respect to energy uptake and extraction resistance.

[0025] According to the present invention, the aerosol-forming substrate is immersed in the aerosol-forming agent. The immersion of the aerosol-forming substrate can be carried out by spraying or other suitable application methods. The aerosol-forming agent can be applied to the blend during the preparation of the cut filler. For example, the aerosol-forming agent may be directly applied to the blend in a direct conditioning casing cylinder (DCCC). Conventional machinery can be used to apply the aerosol-forming agent to the cut filler. 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. The aerosol-forming agent can promote the aerosol being substantially resistant to thermal decomposition at the temperatures typically applied during the use of the aerosol-generating article. Suitable aerosol-forming agents are, for example, polyhydric alcohols (such as triethylene glycol, 1,3-butanediol, propylene glycol, and glycerin), esters of polyhydric alcohols (such as glycerol monoacetate, diacetate, or triacetate), aliphatic esters of monocarboxylic, dicarboxylic, or polycarboxylic acids (such as dimethyl dodecanedioate and dimethyl tetradecanedioate), and combinations thereof.

[0026] The aerosol-forming agent may contain one or more of glycerin and propylene glycol. The aerosol-forming agent can consist of glycerin or propylene glycol, or a combination of glycerin and propylene glycol.

[0027] The amount of the aerosol-forming agent is preferably 6% to 20% by weight based on the dry mass of the aerosol-forming substrate, more preferably 8% to 18% by weight based on the dry mass of the aerosol-forming substrate, and most preferably 10% to 15% by weight based on the dry mass of the aerosol-forming substrate. In some embodiments, the amount of the aerosol-forming agent has a target value of about 13% by weight based on the dry mass of the aerosol-forming substrate. The most efficient amount of the aerosol-forming agent also depends on whether the aerosol-forming substrate comprises a plant lamina or a homogenized plant material. For example, among other factors, the type of the substrate determines the extent to which the aerosol-forming agent can promote the release of substances from the aerosol-forming substrate.

[0028] The aerosol-forming substrate of the present invention generates an aerosol at a lower temperature than a known tobacco cast leaf (TCL) sheet. The aerosol-forming agent is impregnated in the cut filler and is thus provided on the outer surface of the cut filler, and is already sufficient to generate an aerosol even at a lower temperature. Also, nicotine and flavors contained in the cut filler blend are more easily decomposed according to the natural internal structure of the cut filler and become available for the aerosol-forming agent to generate an inhalable aerosol. In contrast, an artificially produced tobacco cast leaf sheet has a rather disordered internal structure that can prevent the movement of active ingredients to the surface.

[0029] For these reasons, the aerosol-forming substrate used in the aerosol-generating article of the present invention can efficiently generate a sufficient amount of aerosol at a relatively lower temperature than the consumables that have been used heretofore using a tobacco cast leaf sheet. A temperature of 150°C to 200°C in the heating chamber is sufficient for the aerosol-forming substrate of the present invention to generate a sufficient amount of aerosol, while in an aerosol-generating device using a tobacco cast leaf sheet, a temperature of typically about 250°C can be used.

[0030] A further advantage of the present invention related to operating at lower temperatures is that cooling the aerosol is not a diminishing requirement. Since generally lower temperatures are used, a simpler cooling function may suffice. This, in turn, allows for the use of simpler and less complex structures for aerosol-generating articles.

[0031] Therefore, advantageously, the aerosol-generating article of the present invention comprises only a substrate portion that provides an aerosol-forming substrate, without additional segments or sections. Such embodiments have a particularly simple structure.

[0032] An aerosol generating article may comprise a substrate portion containing an aerosol-forming substrate and a filter portion. The filter portion is preferably disposed downstream of the substrate portion. The substrate portion may also be disposed in direct contact with the filter portion. The filter portion may include, for example, a hollow tubular filter portion, preferably a hollow acetate tube (HAT), a fine hollow acetate tube (FHAT), or a plug of tow wound around a central cardboard tube, all of which are known from the manufacture of filter elements. The filter portion preferably includes a hollow central space.

[0033] If desired or required, for example, to achieve a sufficiently high draw resistance of the aerosol-generating article, an additional filter section may be included in the aerosol-generating article. Such an additional filter section is preferably included between the base portion and the mouth end portion. Such an additional filter section preferably contains a filtration material such as cellulose acetate. The length of the additional filter section is preferably about 4 mm to about 8 mm, and more preferably about 5 mm to about 7 mm. The combined length of the additional filter section and the hollow tubular filter portion is preferably about 10 mm to about 18 mm, and more preferably 13 mm.

[0034] As used herein, the terms “upstream” and “downstream” are used to describe the relative position of a component or part of a component of the aerosol generating article according to the present invention with respect to the direction of air drawn through the aerosol generating article during use.

[0035] The laminated wrapper may be provided to cover the substrate portion, or the substrate portion and the filter portion. The laminated wrapper may at least partially cover the substrate portion. Alternatively, the laminated wrapper may completely cover the substrate portion. Alternatively, the laminated wrapper may partially cover the substrate portion and partially cover the filter portion. Alternatively, the laminated wrapper may cover the substrate portion, or completely cover it and partially cover the filter portion, or partially cover the substrate portion and completely cover the filter portion.

[0036] The laminated wrapper may cover a length of 20 to 35 millimeters of the aerosol substrate portion. If the aerosol generating article includes a filter portion, the laminated wrapper may cover a length of 20 to 50 millimeters of the aerosol generating article. The laminated wrapper may cover at least 50%, more preferably at least 70%, and more preferably at least 90% of the length of the aerosol forming substrate.

[0037] If a laminated wrapper is provided to at least partially cover the filter portion, optimized thermal insulation can be provided to the filter portion. In this regard, aerosols generated by heating the substrate portion containing the aerosol-forming substrate of an aerosol-generating article may be drawn out toward the edges of the filter portion. Insulating the filter portion can optimize the retention of aerosols while they flow through the filter portion. This effect can be achieved, in particular, by the thermal insulating layer of the laminated wrapper. Furthermore, the thermally conductive layer of the laminated wrapper can transfer heat toward the periphery of the filter portion. This heat can optimize the retention of aerosols in the filter portion or may even contribute to the generation of aerosols in the filter portion. Moreover, insulating the filter portion of an aerosol-generating article can advantageously prevent unintended degradation of the filter portion due to the applied heat.

[0038] The filter portion may be formed from any suitable material or combination of materials. For example, the filter portion may be formed from one or more materials selected from the group consisting of cellulose acetate, cardboard, paper (such as crimped heat-resistant paper or crimped sulfuric acid paper), cotton, viscose, glass fiber, and other polymer materials (such as low-density polyethylene (LDPE)). In a preferred embodiment, the filter portion is formed from cellulose acetate.

[0039] The filter portion may include a hollow tubular element. In a preferred embodiment, the filter portion includes a hollow cellulose acetate tube.

[0040] The filter portion preferably has an outer diameter that is approximately equal to the outer diameter of the aerosol generating article.

[0041] The filter portion may have an outer diameter of approximately 4 mm to approximately 8 mm, for example, approximately 5 mm to approximately 6 mm, preferably about 5.3 mm. The filter portion may have a length of approximately 10 mm to approximately 25 mm.

[0042] The aerosol-generating article may be substantially cylindrical. However, other cross-sections may be used as an alternative. In fact, the cross-section of the aerosol-generating article may vary along its length, for example, by changing the shape or dimensions of the cross-section. The aerosol-generating article may be substantially elongated. The aerosol-generating article may have a length and a circumference substantially perpendicular to its length. The aerosol-forming substrate may be substantially cylindrical. The aerosol-forming substrate may be substantially elongated. The aerosol-forming substrate may also have a length and a circumference substantially perpendicular to its length.

[0043] The aerosol-generating article may have an overall length of 30 to 60 mm, preferably 40 to 50 mm, and more preferably 45 mm. The aerosol-generating article may have an outer diameter of approximately 4 to 8 mm, preferably 5 to 6 mm, and more preferably about 5.3 mm. In one embodiment, the aerosol-generating article may have an overall length of approximately 45 mm. Furthermore, the aerosol-forming substrate may have a length of 20 to 55 mm. The aerosol-forming substrate used in the aerosol-generating article is preferably a non-liquid aerosol-forming substrate. As used herein, the term “non-liquid aerosol-forming substrate” refers to a substrate having the ability to release volatile compounds that can form aerosols. Such volatile compounds may be released by heating the aerosol-forming substrate. Conveniently, the aerosol-forming substrate may be part of the aerosol-generating article or a smoking article.

[0044] The aerosol-forming substrate is a substrate having the ability to release volatile compounds that can form aerosols. The volatile compounds may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may contain nicotine. The aerosol-forming substrate may contain plant-derived materials. The aerosol-forming substrate may contain tobacco. The aerosol-forming substrate may contain tobacco-containing materials that contain volatile tobacco-flavored compounds released from the aerosol-forming substrate upon heating. Alternatively, the aerosol-forming substrate may contain non-tobacco-containing materials. The aerosol-forming substrate may include, for example, homogenized plant-based materials (including homogenized tobacco) produced by a papermaking process or a casting process. Preferably, the aerosol-forming substrate is provided as a cut filler impregnated with the aerosol-forming material.

[0045] The thermal insulation layer may contain one or more of the following: paper, preferably cigarette wrapping paper, cotton, or glass fiber. These materials have high thermal insulation properties. Furthermore, these materials are readily available.

[0046] The laminated wrapper may have a thickness of 30 to 100 micrometers, but is preferably 50 to 70 micrometers, preferably 55 to 58 micrometers, and more preferably about 56.5 micrometers.

[0047] Throughout this specification, the term "about" describes the inherent variation up to ±2 of the last digit. For example, the term "about 56.5 micrometers" may include the range of 56.3 micrometers to 56.7 micrometers. Alternatively, the term "about" may include an uncertainty of up to 5% of the larger of the two values.

[0048] The thickness of the laminated wrapper can enable the lamination of thermally insulating and thermally conductive layers. Furthermore, dimensional stability of the laminated wrapper can be achieved.

[0049] The thermally conductive layer may have a thickness of 4 micrometers to 25 micrometers, but is preferably 5 micrometers to 10 micrometers, preferably 6 micrometers to 7 micrometers, and more preferably about 6.5 micrometers.

[0050] The thickness of the thermally conductive layer can optimize the heat distribution. The thickness of the thermally conductive layer can enable axial heat transfer through the thermally conductive layer, as well as radially inward heat transfer toward the aerosol-forming substrate.

[0051] The thermal insulating layer may have a thickness of 25 micrometers to 75 micrometers, preferably 40 micrometers to 60 micrometers, and more preferably 50 micrometers.

[0052] The thickness of the thermal insulation layer can optimize thermal insulation. The thermal insulation layer can act as a layer to increase the structural integrity of the laminated wrapper. The thermal insulation layer can form a support for the thermally conductive layer.

[0053] The thermal insulating layer may be arranged to surround the thermal conductive layer. Heat can be trapped inside the aerosol-generating article by the thermal insulating layer surrounding the thermal conductive layer. Preferably, the thermal insulating layer is the outermost layer of the aerosol-generating article.

[0054] The aerosol generating article may have an asymmetric cross-section. The term “asymmetric cross-section” means a profile or cross-section of the aerosol generating article that allows insertion of the aerosol generating article into the heating chamber of the aerosol generating device in only one or more specific orientations. In this case, the heating chamber preferably has a corresponding cross-section, which is described in more detail below with respect to the aerosol generating device. A circular cross-section is not an asymmetric cross-section. A rectangular cross-section may be considered an asymmetric cross-section according to the present invention. A rectangular cross-section may allow insertion of the aerosol generating article in only two or four orientations. If the cross-section of the aerosol generating article is square, four orientations are possible; if it is not square, two orientations are possible. The cross-section of the aerosol generating article may also have a shape such that the aerosol generating article inserted into the heating chamber of the corresponding shape can only be inserted in a single orientation. Insertion that is only possible in one or more specific orientations may also be shown as a key configuration of the aerosol generating article. The term “asymmetric cross-section” ignores the inherent structure of the aerosol-forming substrate, in particular the random orientation of the cut filler flakes, when considering symmetry.

[0055] The laminated wrapper may include multiple thermally conductive layers that overlap each other in the axial direction of the aerosol-generating article. In this embodiment, different heating regions of the aerosol-generating article are defined when viewed in the axial direction of the aerosol-generating article. Different numbers of conductive layers may overlap in the different heating regions. In the first heating region, it is preferable that a single thermally conductive layer is provided. This first heating region may be configured similarly to the heating region described above. In this first heating region, it is preferable that there is no laminated wrapper including a thermal insulating layer, and only a single thermally conductive layer is provided. In the second heating region, two thermally conductive layers may be provided adjacent to each other in the radial direction of the aerosol-generating article. In other words, in the second heating region, two thermally conductive layers may cover the aerosol-forming substrate. Providing multiple thermally conductive layers has the effect that it may take a longer time for heat to be transferred from the outside of the aerosol-generating article to the inside of the aerosol-generating article where the aerosol-forming substrate is provided. As a result, these different heating regions may provide stepwise heating. Naturally, three or more heating regions may be provided. For example, a third heating region may be provided, in which three thermally conductive layers are arranged to surround an aerosol-forming substrate. Four or more heating regions may be provided. Preferably, each additional heating region includes a further thermally conductive layer. The thermally conductive layer of the first heating region may extend throughout the entire heating region. The thermally conductive layer of the second heating region may extend to the second heating region and all additional heating regions, but not to the first heating region. In this way, a relatively simple arrangement can be achieved in which multiple heating regions are provided for a stepwise heating effect. The stepwise heating effect may cause heating delays in different heating regions of the aerosol-generating article. Thus, stepwise vaporization of the aerosol-forming substrate can be achieved in the heating regions. For each smoke extraction, one heating region may be provided for a single smoke extraction so that optimized substrate vaporization can be achieved. The aerosol-generating article may be configured for a specific number of smoke extractions, and the number of heating regions may correspond to this specific number of smoke extractions.

[0056] In addition to, or by another means, providing multiple thermal conductive layers, multiple thermal insulating layers may be provided. The multiple heating regions described above may include multiple thermal insulating layers. The laminated wrapper may include a fixed total number of layers. In each of the multiple heating regions, the total number of layers may correspond to the total number of layers in the laminated wrapper. For example, if the laminated wrapper includes four layers, an insulating region may be provided in which only four insulating layers are arranged. The first heating region may be provided with a single thermal conductive layer and three thermal insulating layers. The second heating region may be provided with two thermal conductive layers and two thermal insulating layers. The third heating region may be provided with three thermal conductive layers and one thermal insulating layer. Finally, the fourth heating region may be provided with four thermal conductive layers, but no insulating layers may be provided. Of course, this embodiment is merely illustrative. Fewer or more heating regions may be provided as desired. When a thermal insulating layer is provided within a heating region as described herein, a heating region having the maximum number of thermal conductive layers and the minimum number of thermal insulating layers is likely to transfer the maximum amount of thermal energy from the outside of the aerosol generating article to the inside of the aerosol generating article on which the aerosol forming substrate is disposed. Each of a series of heating regions with a decreasing number of thermal conductive layers and an increasing number of thermal insulating layers is likely to transfer a smaller amount of thermal energy from the outside of the aerosol generating article to the inside of the aerosol generating article. Exemplarily, when the heating element of an aerosol generator uniformly heats the outside of the aerosol generating article, the heat gradually reaches the inside of the aerosol generating article to generate an inhalable aerosol. This effect may be desirable to produce a stepwise heating effect. Furthermore, by providing a laminated wrapper with a fixed number of layers, the thickness of the laminated wrapper, and therefore the diameter of the aerosol generating article, can be kept constant.

[0057] The thermally conductive layer may include one or more of the following: holes, ring shapes, helical shapes, helical shapes with varying widths, axial variations, and radial variations in thickness.

[0058] Different shapes of the thermal conductive layer can realize different heating regimes. These different shapes of the thermal conductive layer can be advantageously used to optimize the vaporization of the aerosol-forming substrate. If multiple thermal conductive layers are provided, each thermal conductive layer may have a desired shape that may be similar to or different from the shapes of the further thermal conductive layers. A thermal insulating layer of a laminated wrapper, which is arranged to partially cover the thermal conductive layer, may be arranged such that the shape of the thermal conductive layer not covered by the thermal insulating layer may have a different shape. For example, a ring shape of the thermal conductive layer can be realized in a uniform thermal conductive layer that is partially covered by the thermal insulating layer, such that the ring-shaped portion of the thermal conductive layer is not covered by the thermal insulating layer. The same may apply to further shapes of the thermal conductive layer as described above. Alternatively, the thermal conductive layer itself may have such a shape. If the thermal conductive layer has axial variation, it is preferable that the heating regions described above have different shapes from each other. For example, the first heating region may have an annular shape with a relatively small axial length, and then the second heating region may have a longer axial length. For example, the actual length of the first heating region may be about 1 millimeter, and the axial length of the second heating region may be about 2 millimeters. This is to be understood as merely an example. Any desired axial length and shape of one or more heating regions can be selected. Variation in the radial thickness of the thermal conductive layer means that the thermal conductive layer does not have a uniform thickness. In some embodiments, the thickness of the thermal conductive layer may vary along the axial length of the thermal conductive layer. In particular, the different heating regions described above may be a single thermal conductive layer with varying thickness instead of multiple thermal conductive layers. Similarly, the thickness of the thermal insulating layer may vary if desired.

[0059] The present invention also relates to an aerosol generating apparatus comprising a heating chamber and a heating element disposed adjacent to the heating chamber. The heating chamber is configured for the insertion of the aerosol generating article described above. When the aerosol generating article is inserted into the heating chamber, the heating element is configured to heat the heating region of the aerosol generating article, in which only the thermally conductive layer is disposed.

[0060] The heating chamber may have a cylindrical shape for inserting the aerosol generating article. The heating chamber may be a recess. The heating chamber may have a circular profile or cross-section. As described above, if the aerosol generating article has an asymmetric profile, the heating chamber preferably has a corresponding asymmetric profile. For example, if the aerosol generating article has a rectangular profile, the heating chamber preferably has a rectangular profile. If the aerosol generating article has an asymmetric profile configured to allow insertion of the aerosol generating article into the heating chamber in only one orientation, the heating chamber preferably has a corresponding cross-section. For example, the aerosol generating article may include grooves, nuts, shoulders, or similar elements along the length of the aerosol generating article and on the outside of the aerosol generating article, and the heating chamber may include corresponding grooves, nuts, shoulders, or similar elements to engage with the elements of the aerosol generating article so that the aerosol generating article can be inserted in a single specific orientation.

[0061] The heating element may be disposed inside or around the heating chamber. The heating element may be disposed inside or around the heating chamber to heat an aerosol-generating article that can be inserted into the heating chamber. Alternatively, or additionally, an internal heating element may be provided, for example, a pin or blade that is at least partially inserted into an aerosol-forming substrate for use.

[0062] For example, the apparatus may include an external heating element positioned around the periphery of the heating chamber. The external heating element may take any suitable form. For example, the external heating element may take the form of one or more flexible heating foils on a dielectric substrate such as polyimide. The flexible heating foils may be shaped to fit the periphery of the heating chamber. Alternatively, the external heating element may take the form of a metal grid, a flexible printed circuit board, a molded circuit component (MID), a ceramic heating element, a flexible carbon fiber heating element, or may be formed on a substrate of a suitable shape using a coating technique such as plasma deposition. The external heating element may also be formed using a metal having a clear relationship between temperature and resistivity. In such exemplary apparatuses, the metal may be formed as a track between two layers of suitable insulating material. The external heating element formed in this manner may be used during operation for both heating the external heating element and monitoring its temperature. The heating element may be configured to heat to a temperature of approximately 200 degrees Celsius. The heating element may also be configured as an induction heating element, in which case it preferably includes an induction coil. In this embodiment, the aerosol-forming substrate of the aerosol-generating article may include a susceptor material for generating heat inside the aerosol-forming substrate. Alternatively, in this embodiment, a susceptor material, for example, in the shape of a blade or pin, may be disposed inside the heating chamber to penetrate the aerosol-forming substrate of the aerosol-generating article when the aerosol-generating article is inserted into the heating chamber.

[0063] The heating element may be arranged around the heating chamber to uniformly heat the heating chamber. This may have the effect of uniformly heating the aerosol generating article, particularly the substrate portion of the aerosol generating article, when the aerosol generating article is inserted into the heating chamber. As described above, the laminated wrapper surrounding the aerosol generating article may have a specific structure that allows for stepwise heating of the aerosol-forming substrate inside the aerosol generating article. In particular, the laminated wrapper may generate different heating regions. These different heating regions may be particularly useful when the aerosol generating article is uniformly heated from the outside by a heating element arranged to surround the heating chamber.

[0064] Alternatively, the heating element may be configured to heat a specific area of ​​the aerosol-generating article when the article is inserted into the heating chamber. The heating element may include a plurality of separately controllable heating sections for this purpose. These separately controllable heating sections may be arranged along the longitudinal length of the heating chamber to heat separate sections of the aerosol-generating article. Preferably, the separately controllable heating sections are configured to heat different heating regions of the aerosol-generating article. Each separately controllable heating section may completely enclose the heating chamber. The separately controllable heating sections may be controllable by an electrical circuit, which will be described in more detail below. Alternatively, or additionally, the separately controllable heating sections may be arranged parallel to the longitudinal axis of the heating chamber. Instead of separately controllable heating sections, the heating element may be configured to generate a heating gradient during heating. The heating element may be configured to generate a heating gradient along the longitudinal axis of the heating chamber parallel to the longitudinal axis of the heating chamber.

[0065] The heating element may be configured to radiate heat toward the aerosol-generating article when the aerosol-generating article is inserted into the heating chamber. The heat may be optimally absorbed and transferred by the thermally conductive layer of the laminated wrapper of the aerosol-generating article. The heat may be radiated or transferred by the thermally conductive layer to the aerosol-forming substrate of the aerosol-generating article. This effect is particularly useful when the heat source does not apply heat homogeneously. Thus, the thermally conductive layer can transport heat from the heat source along the aerosol-generating substrate and, if necessary, distribute the heat homogeneously if the coating of the thermally conductive layer is homogeneous throughout the aerosol-generating substrate. Alternatively, if the coating of the thermally conductive layer does not extend throughout the aerosol-generating substrate, the heat from the heat source can be selectively distributed throughout the aerosol-generating substrate.

[0066] As used herein, "aerosol generator" refers to a device that generates an aerosol by interacting with an aerosol-forming substrate. The aerosol-forming substrate may be part of an aerosol-generating article. An aerosol generator can be a device that generates an aerosol by interacting with the aerosol-forming substrate of an aerosol-generating article. An aerosol generator may comprise a housing, an electrical circuit, a power supply, a heating chamber, and a heating element. An aerosol generator may optionally comprise a mouthpiece.

[0067] The electrical circuit may include a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of the controller. The electrical circuit may include further electronic components. The electrical circuit may be configured to regulate the power supply to the heating element. Power may be supplied to the heating element continuously after the system is started, or intermittently, such as with each smoke extraction. Power may be supplied to the heating element in the form of current pulses. Preferably, the electrical circuit is configured to monitor the electrical resistance of the heating element and to control the power supply to the heating element according to its electrical resistance.

[0068] The device may have a power source (typically a battery) within its main body. Alternatively, the power source may be another form of charge storage device, such as a capacitor. The power source may require recharging and may have a capacity that allows for sufficient energy storage for one or more use experiences. For example, the power source may have a capacity sufficient to continuously generate aerosols for about 6 minutes, or for a time period that is a multiple of 6 minutes. In another embodiment, the power source may have a capacity sufficient to generate aerosols for multiple inhalations.

[0069] The power source may be any suitable power source, such as a DC voltage source such as a battery. In one embodiment, the power source is a lithium-ion battery. Alternatively, the power source may be a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery (e.g., a lithium-cobalt battery, a lithium iron phosphate battery, a lithium titanate battery, or a lithium polymer battery).

[0070] The aerosol generator may include a mouthpiece. The mouthpiece may be a separate element or may be integrally formed with the aerosol generator. The mouthpiece may be connectable to or connected to the aerosol generator, preferably by a hinge. The mouthpiece may be configured as a venturi element. The mouthpiece may be configured to be connectable to an aerosol generating article. The mouthpiece may be configured to be insertable into the filter portion of the aerosol generating article.

[0071] The present invention relates to a system comprising an aerosol generator and an aerosol generating article as described herein. The present invention also relates to a system comprising an aerosol generating article as described herein and a mouthpiece, preferably a venturi element as described herein. The present invention also relates to a system comprising an aerosol generator, an aerosol generating article and a mouthpiece.

[0072] The present invention also relates to a method for producing an aerosol-generating article, the method being: i. A step of providing an aerosol generating article comprising an aerosol-forming substrate, wherein the aerosol-forming substrate comprises a plant material cut filler, the plant material cut filler comprises at least 25 percent of plant laminas by weight of the total plant material, and the aerosol-forming substrate further comprises about 6 percent to about 20 percent of aerosol-forming material. ii. A step of winding a laminated wrapper at least partially around an aerosol-forming substrate, wherein the laminated wrapper includes a thermally conductive layer and a thermally insulating layer, and the thermally conductive layer and the thermally insulating layer overlap along the axial direction of the aerosol-generating article.

[0073] The method may include the step of inserting the aerosol-generating article into the heating chamber of the aerosol generator. The method may also include the step of heating the aerosol-generating article.

[0074] Features described in reference to one aspect of the present invention may also apply equally to other aspects of the present invention.

[0075] The present invention will be further explained with reference to the following attached drawings, which are for illustrative purposes only. [Brief explanation of the drawing]

[0076] [Figure 1] Figure 1 shows a cross-sectional view of an aerosol generating article inserted into the heating chamber of an aerosol generating device. [Figure 2] Figure 2 shows different embodiments of the thermally conductive layer of the laminated wrapper for an aerosol-generating article. [Figure 3] Figure 3 shows a cross-sectional view of an embodiment of a laminated wrapper having multiple thermal conductive layers and multiple thermal insulating layers. [Modes for carrying out the invention]

[0077] Figure 1 shows an aerosol generating article 10. The aerosol generating article 10 is inserted into the heating chamber 12 of the aerosol generating device 14. The aerosol generating article 10 includes a base portion 16 containing an aerosol forming substrate. In the embodiment shown in Figure 1, the aerosol generating article 10 further comprises a filter portion 18 in the form of a hollow acetate tube. The filter portion 18 is disposed downstream of the base portion 16. The filter portion 18 is optional.

[0078] Figure 1 shows a laminated wrapper 20 wound around a base portion 16 and a filter portion 18 of an aerosol generating article 10. If a filter portion 18 is not provided, the laminated wrapper 20 is wound only around the base portion 16. The laminated wrapper 20 includes a thermal conductive layer 22 and a thermal insulating layer 24. The thermal conductive layer 22 is disposed on the inside, meaning it is directly adjacent to the aerosol forming substrate or filter portion 18. The thermal insulating layer 24 is disposed wound around the thermal conductive layer 22.

[0079] The thermal insulating layer 24 and the thermal conductive layer 22 overlap along the longitudinal length of the aerosol generating article 10. In the embodiment shown in Figure 1, the bottom of the aerosol generating article 10, which is the upstream end 26, is wrapped only with the thermal conductive layer 22. Thus, the base portion 16 is wrapped with the thermal conductive layer 22. A filter portion 18 is provided at the top of the aerosol generating article 10, which is the downstream end 28. The filter portion 18 is wrapped only with the thermal insulating layer 24 of the laminated wrapper 20. Between the portion of the base portion 16 adjacent to the upstream end 26 of the aerosol generating article 10 and the filter portion 18 adjacent to the downstream end 28 of the aerosol generating article 10, the laminated wrapper 20 that packages the aerosol generating article 10 includes the thermal conductive layer 22 and the thermal insulating layer 24.

[0080] As shown in Figure 1, when the aerosol generating article 10 is inserted into the aerosol generator 14, the heating element 30 of the aerosol generator 14 may be positioned adjacent to the thermal conductive layer 22 near the upstream end 26 of the aerosol generating article 10. This region of the aerosol generating article 10 covered only by the thermal conductive layer 22 constitutes a heated region 32. In this region, the heat radiated by the heating element 30 is transferred directly into the thermal conductive layer 22 of the laminated wrapper 20. Thus, the heat is absorbed by the thermal conductive layer 22 and further transferred toward the aerosol-forming substrate contained within the aerosol generating article 10. Furthermore, the heat absorbed by the thermal conductive layer 22 is transferred into the thermal conductive layer 22 in the axial direction of the aerosol generating article 10 so that uniform heating can be achieved. In other words, a relatively small heating element 30 may be provided to heat a relatively small heated region 32 of the aerosol generating article 10 compared to the full size of the substrate portion 16 of the aerosol generating article 10. Nevertheless, due to the high thermal conductivity of the thermal conductive layer 22, heat can be uniformly distributed across the base portion 16 of the aerosol generating article 10.

[0081] Alternatively, the heating element 30 may be arranged to surround the entire heating chamber 12 or a large portion of the heating chamber 12 in order to achieve more uniform heating of the aerosol generating article 10.

[0082] The thermal insulating layer 24 absorbs heat from the inside of the aerosol generating article 10 when heat reaches the inside of the aerosol generating article 10 through the thermal conductive layer 22. As shown in Figure 1, it is preferable that the thermal insulating layer 24 extends over a filter portion 18 disposed adjacent to the downstream end 28 of the aerosol generating article 10. In this way, heat does not leak out in the region of the filter portion 18, or leaks out at a reduced rate. This functionality improves aerosol formation and stabilizes the aerosol as it is drawn out from the base portion 16 through the filter portion 18 during smoke extraction.

[0083] Figure 1 shows further components of the aerosol generator 14 for operating the aerosol generator 14. In this regard, the aerosol generator 14 includes a power source 34, preferably a battery, for supplying power to the heating element 30. The supply of electrical energy from the power source 34 to the heating element 30 is controlled by an electrical circuit 36.

[0084] As will be explained below with respect to Figures 2 and 3, a gradual heating effect can be achieved by the laminated wrapper 20 of the aerosol-generating article 10. Figure 2 shows different embodiments of the laminated wrapper 20, more specifically, the thermally conductive layer 22 of the laminated wrapper 20. The upper part of Figure 2 shows an embodiment in which holes 38 are provided within the thermally conductive layer 22. The holes 38 can change the heat transfer characteristics of the thermally conductive layer 22. As shown in the left part of the aerosol-generating article 10 shown in the upper part of Figure 2, more holes 38 may be provided in the upstream region of the substrate portion 16 compared to the downstream region of the substrate portion 16. As a result, a heating region 32 can be realized in which the aerosol-forming substrate is heated faster or slower. Thus, a gradual heating effect can be achieved.

[0085] The central portion of Figure 2 shows an embodiment in which the thermally conductive layer 22 is provided in an annular shape. Multiple heating regions 32 are provided by multiple annular rings surrounding the aerosol-forming substrate. Parts between the heating regions 32 may be covered by one or more thermal insulating layers 24.

[0086] The lower part of Figure 2 shows an embodiment in which the thermal conductive layer 22 has a helical configuration. This embodiment can be achieved by providing fragments of the thermal conductive layer 22 and winding the fragments around an aerosol-forming substrate. Alternatively, a continuous thermal conductive layer 22 may be provided, and portions between the helical portions of the thermal conductive layer 22 may be covered by one or more thermal insulating layers 24. The helical portions of the thermal conductive layer 22 can realize a heated region 32 of the aerosol-generating article 10.

[0087] Figure 3 shows a further embodiment of the laminated wrapper 20, which is provided with multiple thermal insulating layers 24 and multiple thermal conductive layers 22. The embodiment shown in Figure 3 is particularly useful when the heating element 30 of the aerosol generator 14 uniformly heats the area around the aerosol generating article 10 when the aerosol generating article 10 is inserted into the heating chamber 12. The multiple layers of the laminated wrapper 20 shown in Figure 3 are provided to generate multiple heating regions. The left portion of the laminated wrapper 20 shown in Figure 3 shows a first heating region 40, which is provided with three thermal conductive layers 22. In this region, heat can move rapidly through the thermal conductive layers 22 into the thermoforming substrate contained within the heat generating article. The central portion of the laminated wrapper 20 shows a second heating region 42, in which two thermal conductive layers 22 are arranged to surround the aerosol forming substrate and a single thermal insulating layer 24 is arranged to surround the two thermal conductive layers 22. This second heating region 42 takes longer to heat due to the thermal insulating layer 24. Therefore, if all heating regions are uniformly heated by the heating element 30 of the aerosol generator 14, a stepwise heating effect can be achieved, as shown by the arrows in Figure 3 indicating the direction of heat. The first heating region 40 may heat up faster than the second heating region 42. The right portion of Figure 3 shows a third heating region 44, which is provided by a single thermal conductive layer 22 and two thermal insulating layers 24. This heating region heats up even more slowly than the second heating region 42.

[0088] 1. Articles that generate aerosols, Aerosol-forming substrate comprising a plant material cut filler, wherein the plant material cut filler comprises at least 25 percent of plant lamina by weight of the total plant material, and the aerosol-forming substrate further comprises about 6 percent to about 20 percent aerosol-forming material. A laminated wrapper disposed at least partially wound around the aerosol-forming substrate, wherein the laminated wrapper includes a thermally conductive layer and a thermally insulating layer, An aerosol generating article in which the thermal conductive layer and the thermal insulating layer overlap along the axial direction of the aerosol generating article. 2. The aerosol generating article according to claim 1, wherein the laminated wrapper includes at least one heating region on which only the thermally conductive layer is disposed. 3. The aerosol generating article according to 2, wherein the heating region has an annular shape. 4. The aerosol generating article according to any one of 1 to 3, wherein the thermal conductive layer contains one or more of aluminum, tin, and copper. 5. The aerosol generating article according to any one of 1 to 4, wherein the thermal insulating layer comprises one or more of paper, preferably cigarette wrapping paper. 6. The aerosol-generating article according to any one of 1 to 5, wherein the laminated wrapper has a thickness of 30 micrometers to 100 micrometers, preferably 50 micrometers to 70 micrometers, preferably 55 micrometers to 58 micrometers, and more preferably about 56.5 micrometers. 7. An aerosol generating article according to any one of 1 to 6, wherein the thermally conductive layer has a thickness of 4 micrometers to 25 micrometers, preferably 5 micrometers to 10 micrometers, preferably 6 micrometers to 7 micrometers, and more preferably about 6.5 micrometers. 8. The aerosol generating article according to any one of 1 to 7, wherein the thermal insulating layer has a thickness of 25 micrometers to 75 micrometers, preferably 40 micrometers to 60 micrometers, and more preferably 50 micrometers. 9. An aerosol generating article according to any one of 1 to 8, wherein the thermal insulating layer is arranged to surround the thermal conductive layer. 10. The aerosol generating article according to any one of 1 to 9, wherein the aerosol generating article has an asymmetric profile. 11. The aerosol generating article according to any one of 1 to 10, wherein the laminated wrapper includes a plurality of thermally conductive layers that overlap each other in the axial direction of the aerosol generating article. 12. An aerosol generating article according to any one of 1 to 11, wherein the thermal conductive layer includes one or more of the following: holes, ring shape, helical shape, helical shape with width variation, axial variation, and radial thickness variation. 13. The aerosol generating article according to any one of 1 to 12, wherein the aerosol generating article further includes a tubular filter section downstream of the aerosol forming substrate, and the thermal conductive layer is disposed at least partially wound around the tubular filter section. 14. Aerosol generator, Heating chamber and The heating element is disposed adjacent to the heating chamber, An aerosol generating device in which the heating chamber is configured for inserting an aerosol generating article according to any one of 1 to 13, and when the aerosol generating article is inserted into the heating chamber, the heating element is configured to heat the heating region of the aerosol generating article in which only the thermally conductive layer is disposed. 15. A method for manufacturing an aerosol-generating article, wherein the method is i. A step of providing an aerosol generating article containing an aerosol-forming substrate, ii. A method comprising the step of winding a laminated wrapper at least partially around the aerosol-forming substrate, wherein the laminated wrapper comprises a thermally conductive layer and a thermally insulating layer, and the thermally conductive layer and the thermally insulating layer overlap along the axial direction of the aerosol-generating article.

Claims

1. Aerosol-generating article, an aerosol-forming substrate comprising a plant material cut filler, and further comprising about 6 percent to about 20 percent of an aerosol-forming material, A laminated wrapper disposed at least partially wound around the aerosol-forming substrate, wherein the laminated wrapper includes a thermally conductive layer and a thermally insulating layer, Equipped with, The laminated wrapper has a thickness of 30 micrometers to 100 micrometers. The thermal conductive layer and the thermal insulating layer overlap along the axial direction of the aerosol generating article. The aerosol generating article comprises a base portion containing the aerosol forming substrate and a filter portion, The aforementioned filter portion includes a hollow tubular filter portion, The hollow tubular filter portion is in direct contact with the base portion. Aerosol-generating articles.

2. The aerosol generating article according to claim 1, wherein the laminated wrapper includes at least one heating region on which only the thermally conductive layer is disposed.

3. The aerosol generating article according to claim 2, wherein the heating region has an annular shape.

4. The aerosol generating article according to any one of claims 1 to 3, wherein the thermally conductive layer comprises one or more of aluminum, tin, and copper.

5. The aerosol generating article according to any one of claims 1 to 4, wherein the thermal insulating layer comprises one or more pieces of paper.

6. The aerosol generating article according to any one of claims 1 to 5, wherein the laminated wrapper has a thickness of 50 micrometers to 70 micrometers.

7. The aerosol generating article according to any one of claims 1 to 6, wherein the thermally conductive layer has a thickness of 4 micrometers to 25 micrometers.

8. The aerosol generating article according to any one of claims 1 to 7, wherein the thermal insulating layer has a thickness of 25 micrometers to 75 micrometers.

9. The aerosol generating article according to any one of claims 1 to 8, wherein the plant material cut filler comprises at least 25 percent plant lamina by weight of the total plant material.

10. The aerosol generating article according to any one of claims 1 to 9, wherein the aerosol generating article has an asymmetric profile.

11. The aerosol generating article according to any one of claims 1 to 10, wherein the laminated wrapper includes a plurality of thermally conductive layers that overlap each other in the axial direction of the aerosol generating article.

12. The aerosol generating article according to any one of claims 1 to 11, wherein the thermal conductive layer includes one or more of the following: holes, ring shape, helical shape, helical shape with width variation, axial variation, and radial thickness variation.

13. The aerosol generating article according to any one of claims 1 to 12, further comprising a tubular filter section downstream of the aerosol forming substrate, wherein the thermally conductive layer is disposed at least partially wound around the tubular filter section.

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