Inductively heatable tobacco product

Abstract

To provide an inductively heatable tobacco product optimized for aerosol generation.SOLUTION: The inductively heatable tobacco product for aerosol generation comprises an aerosol-forming substrate containing a susceptor in the form of a plurality of particles. The aerosol-forming substrate is a crimped tobacco sheet comprising a tobacco material, fibers, a binder, an aerosol former, and the susceptor in the form of the plurality of particles.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] INDUCTIONALLY HEATABLE TOBACCO PRODUCT FOR AEROSOL GENERATION FIELD OF THE INVENTION The present invention relates to an inductively heatable tobacco product for aerosol generation. The tobacco product is particularly suitable for use in an induction heating device for aerosol generation. [Background technology]

[0002] In electrically heatable smoking devices, for example, a tobacco plug made of a tobacco sheet containing tobacco particles and glycerin as an aerosol former is heated by a heatable blade. During use, the tobacco plug is pressed up onto the heated blade so that the plug material is in thermal contact with the blade. In aerosol-generating devices, the tobacco plug is heated to vaporize volatile compounds within the plug material, preferably without burning the tobacco as in conventional cigarettes. However, in order to heat the distant peripheral area of the plug to generate aerosol, the material closest to the heating blade must be excessively heated so that combustion of the tobacco near the blade is not completely prevented.

[0003] The use of inductive heating has been proposed for aerosol-forming substrates, and the dispersion of individual susceptor materials within the tobacco material has also been proposed, but no solution has been proposed for optimal heating of tobacco plugs made from crimped tobacco sheets.

[0004] Thus, there is a need for an inductively heatable tobacco product that is optimized for aerosol generation, and in particular, a tobacco product that allows for optimal aerosol generation from a tobacco plug made with an aerosol former that includes a crimped tobacco sheet. Summary of the Invention

[0005] According to one aspect of the present invention, an inductively heatable tobacco product for generating an aerosol is provided. The tobacco product includes an aerosol-forming substrate containing a plurality of susceptors in the form of particles. The aerosol-forming substrate is a laminated tobacco sheet containing tobacco material, fibers, a binder, an aerosol former, and a plurality of susceptors in the form of particles. The susceptors in the tobacco product have the ability to convert energy transmitted as magnetic waves into heat (referred to herein as heat loss). The greater the heat loss, the more energy transmitted as magnetic waves to the susceptors is converted into heat by the susceptors. The heat loss is at least 0.008 joules / kilogram, preferably 0.05 joules / kilogram, and preferably at least 0.1 joules / kilogram during a single sine wave cycle applied to a circuit provided to induce the susceptors. The heat loss per kilogram per second can be varied by varying the frequency of the circuit. Typically, a high-frequency current is supplied by a power source and passes through an inductor to induce the susceptors. The frequency in the inductor or circuit may be in the range of 1 MHz to 30 MHz, preferably in the range of 1 MHz to 10 MHz, or 1 MHz to 15 MHz, and more preferably in the range of 5 MHz to 7 MHz. When used in this specification and below, the term "range of" is understood to explicitly disclose each boundary value.

[0006] In a preferred embodiment, a tobacco product according to the present invention has a heat dissipation of at least 0.008 Joules per kilogram, which can be achieved during a single cycle of application to a circuit provided to excite the susceptor, the circuit preferably having a frequency in the range of 1 MHz to 10 MHz.

[0007] Alternatively, if the minimum wattage or joules per second is known based on the composition and size of the substrate, the susceptor can be provided in the substrate as a weight percentage sufficient to allow for the desired minimum wattage.

[0008] As mentioned above, heat loss is the capacity of the susceptor to transfer heat to the surrounding material. Heat is generated in the form of multiple particles within the susceptor. The susceptor primarily conductively heats the tobacco material and aerosol former in close or proximal contact to develop the desired flavor. Thus, heat loss is determined by the material and the contact of the susceptor with its surroundings. In the tobacco product according to the present invention, the susceptor particles are preferably uniformly distributed within the aerosol-forming substrate. This allows for uniform heat loss within the aerosol-forming substrate, thereby generating uniform heat distribution within the aerosol-forming substrate and within the tobacco product, leading to a uniform temperature distribution within the tobacco product.

[0009] A uniform or homogeneous temperature distribution in a tobacco product is understood herein as a tobacco product having a substantially similar temperature distribution across the entire cross section of the tobacco product. Preferably, the tobacco product is heated such that the difference in temperature between different regions of the tobacco product, such as the central and peripheral regions of the tobacco product, is less than 50 percent, preferably less than 30 percent.

[0010] It has been found that a minimum unit heat loss of 0.05 joules per kilogram in a tobacco product allows the tobacco product to be heated to a substantially uniform temperature at which adequate aerosol generation is provided. The average temperature of the tobacco product is preferably about 200°C to about 240°C. This has been found to be the temperature range at which desirable amounts of volatile compounds are produced, particularly in tobacco sheets made from homogenized tobacco material containing glycerin as an aerosol former, and particularly in cast leaf tobacco sheets, as described in more detail below. At these temperatures, there is no substantial overheating of individual regions of the tobacco product, although the susceptor particles can reach temperatures of up to about 400-450°C.

[0011] The susceptor particles are embedded in the tobacco sheet, and thus in the aerosol-forming substrate. The particles are immobilized and remain in their initial position. The particles can be embedded on or in the tobacco sheet. Preferably, the particles are uniformly distributed in the aerosol-forming substrate. By embedding the susceptor particles in the substrate, the uniform distribution remains uniform even during tobacco product formation by crimping the tobacco sheet and forming the tobacco product. For example, a rod can take the form of a crimped tobacco sheet, and the rod can be cut to the required rod length for the tobacco product.

[0012] The tobacco sheet is preferably a cast leaf, which is a form of reconstituted tobacco formed from a slurry containing tobacco particles, fiber particles, an aerosol former, a binder, and, for example, flavors.

[0013] The tobacco particles may be in the form of tobacco dust having particles of approximately 30 micrometers to 250 micrometers, preferably approximately 30 micrometers to 80 micrometers, or approximately 100 micrometers to 250 micrometers, depending on the desired sheet thickness and casting gap, where the casting gap typically defines the sheet thickness.

[0014] The fiber particles may include tobacco stem material, stalks or other tobacco plant material, and other cellulosic fibers (such as wood fibers with low lignin content). The fiber particles may be selected to provide sufficient tensile strength to the cast leaf at a low content (e.g., approximately 2-15%). Alternatively, fibers (such as plant fibers) may be used in conjunction with or in place of the above-mentioned fiber particles, including hemp and bamboo.

[0015] The aerosol formers included in the slurry forming the cast leaf can be selected based on one or more properties. Functionally, the aerosol formers vaporize when heated above the aerosol former's specific vaporization temperature, providing a mechanism for delivering nicotine, flavorings, or both in the aerosol. Different aerosol formers typically vaporize at different temperatures. Aerosol formers can be selected based on their ability to remain stable at or near room temperature, for example, but vaporize at higher temperatures, e.g., between 40°C and 450°C. Aerosol formers can also possess humectant-type attributes that help maintain a desired level of moisture within the aerosol-forming substrate when the substrate is comprised of a tobacco-derived product containing tobacco particles. In particular, some aerosol formers are water-absorbent materials that function as humectants, i.e., materials that help keep the substrate moist, including the humectant.

[0016] One or more aerosol formers may be combined to take advantage of one or more attributes of the combined aerosol formers, for example, triacetin may be combined with glycerin and water to take advantage of triacetin's ability to carry active ingredients and the wetting properties of glycerin.

[0017] The aerosol former may be selected from polyols, glycol ethers, polyol esters, esters, and fatty acids, and may include one or more of the following compounds: glycerin, erythritol, 1,3-butylene glycol, tetraethylene glycol, triethylene glycol, triethyl citrate, propylene carbonate, ethyl laurate, triacetin, meso-erythritol, diacetin mixtures, diethyl suberate, triethyl citrate, benzyl benzoate, benzyl phenyl acetate, ethyl vanillate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene glycol.

[0018] A standard process for producing cast leaf includes preparing tobacco. To this end, the tobacco is shredded. The shredded tobacco is then mixed with other types of tobacco and ground. Typically, the other types of tobacco are other types of tobacco, such as Virginia or Burley, or may be tobacco processed in a different way. The mixing and grinding steps can be interchangeable. Preferably, the fibers are prepared separately and used for a slurry in the form of a solution. The solution and the prepared tobacco are then mixed, preferably with susceptor particles. To form the cast leaf, the slurry is transferred to a sheet-forming device. This can be, for example, a surface of a continuous belt, onto which the slurry can be continuously spread. The slurry is distributed on the surface to form a sheet. The sheet is then preferably heat-dried and cooled after drying. Susceptor particles can also be applied to the slurry after it has been formed into a sheet, but before the sheet is dried. This allows the susceptor particles to be uniformly distributed within the sheet material, but also within the tobacco product formed by the compression of the tobacco sheet. The ends of the cast leaves may be trimmed and the sheet slit before the cast leaves are wound onto bobbins for future use. However, slitting may also be performed after the sheet is wound onto the bobbins. The bobbins may then be moved to sheet processing equipment, such as a crimping and rod-forming unit, or placed in a bobbin storage facility for future use.

[0019] The thickness of the crimped tobacco sheet (e.g., cast leaf) may range from about 0.5 millimeters to about 2 millimeters, with a range of about 0.8 millimeters to about 1.5 millimeters, e.g., 1 millimeter, being preferred. Thickness variations of up to about 30 percent may occur due to manufacturing tolerances.

[0020] The susceptor is a conductor that can be inductively heated. The susceptor can absorb electromagnetic energy and convert it into heat. In tobacco products according to the present invention, the susceptor is heated by varying the electromagnetic field generated by one or more induction coils of an induction heating device, which then transfers heat to the aerosol-forming substrate of the tobacco product primarily by thermal conduction. For this purpose, the susceptor is in thermal proximity to the tobacco material and the aerosol-forming elements of the aerosol-forming substrate. Due to the fine particle nature of the susceptor, heat is generated according to the distribution of particles within the tobacco sheet.

[0021] In some preferred embodiments of the tobacco product according to the invention, the tobacco material is a homogenized tobacco material and the aerosol former comprises glycerin. Preferably, the tobacco product is made of cast leaf, as described above.

[0022] Furthermore, it has been found that only certain susceptor particles with specific properties are suitable in combination with tobacco products made of a compressed tobacco sheet containing an aerosol former, and in particular made of a compressed cast leaf, preferably containing glycerin as an aerosol former, in order to provide sufficient heat for optimal aerosol formation, but preferably without burning tobacco or fiber.

[0023] Optimal selection and distribution of particles within a tobacco sheet can reduce the energy required for heating, while still providing sufficient energy to release volatile compounds from the substrate. Energy reduction not only reduces the energy consumption of an induction heating device for aerosol generation used in conjunction with a tobacco product, but also reduces the risk of overheating the aerosol-generating substrate. Energy efficiency is also achieved by achieving highly uniform and complete depletion of aerosol formers within the tobacco product. In particular, the peripheral areas of the tobacco product can also contribute to aerosol formation. This can result in more efficient use of tobacco products, such as tobacco plugs. For example, evaporating the same amount of volatile compounds from a tobacco product as would traditionally be found in a more widely heated or larger aerosol-forming substrate can improve the smoking experience and reduce the size of the tobacco product. This can result in cost savings and reduced waste.

[0024] According to one embodiment of the tobacco product of the present invention, the size of the susceptor particles is preferably in the range of about 5 micrometers to about 100 micrometers, and more preferably in the range of about 10 micrometers to about 80 micrometers, for example, in the range of 20 micrometers to 50 micrometers. These size ranges for particles used as susceptors have been found to be optimal, allowing for uniform distribution within the tobacco sheet. Particles that are too small are undesirable due to the skin effect, which prevents small particles from generating heat efficiently. Furthermore, smaller particles may pass through conventional filters when used in smoking articles. Such filters may also be used in combination with the tobacco product of the present invention. Larger particles make uniform distribution within the sheet material difficult or impossible, particularly in tobacco products formed by the compression of tobacco sheets. Larger particles may not be as finely distributed within the tobacco sheet as smaller particles. Furthermore, larger particles tend to protrude from the tobacco sheet so that they come into contact with each other when the tobacco sheet is compressed. This is undesirable because it results in increased localized heat generation. Herein, particle size is understood to mean the equivalent spherical diameter. Since particles can also be irregularly shaped, the equivalent spherical diameter defines the spherical diameter of the equivalent volume for an irregularly shaped particulate.

[0025] According to another embodiment of the tobacco product of the present invention, the amount of the plurality of particles ranges from about 4 weight percent to about 45 weight percent of the tobacco product, and preferably from about 10 weight percent to about 40 weight percent, e.g., 30 weight percent. It will be apparent to those skilled in the art that, while various weight percentages of susceptor are provided above, varying the composition of the components comprising the tobacco product, including the weight percentages of tobacco, aerosol former, binder, and water, will require adjustment of the weight percentage of susceptor required to effectively heat the tobacco product.

[0026] The amount of susceptor particles within these weight ranges relative to the weight of the tobacco product has been found to be optimal for providing uniform heat distribution throughout the tobacco product, and further, these weight ranges of susceptor particles are optimal for providing sufficient heat to heat the tobacco product uniformly and to an average temperature, for example, between 200°C and 240°C.

[0027] According to another aspect of the tobacco product of the present invention, the particles comprise or are made of a sintered material. The sintered material provides a wide variety of electrical, magnetic, and thermal properties. The sintered material may be of ceramic, metallic, or plastic nature. Preferably, metal alloys are used for the susceptor particles. Depending on the manufacturing process, such sintered materials may be tailored to specific specifications. Preferably, the sintered material for the particles used in the tobacco product of the present invention has a high thermal conductivity and a high magnetic permeability.

[0028] According to a further aspect of the tobacco product of the present invention, the particles have a chemically inert outer surface. The chemically inert surface prevents the particles from undergoing chemical reactions or acting as a catalyst to initiate potentially undesirable chemical reactions when the product is heated. The inert chemical outer surface may be the chemically inert surface of the susceptor material itself. The inert chemical outer surface may also be a chemically inert cover layer that encapsulates the susceptor material within the chemically inert cover. The cover material is capable of withstanding temperatures as high as those to which the particles are heated. The encapsulation step may be incorporated into the sintering process when the particles are manufactured. Chemical inertness is understood herein to refer to chemicals that are produced by heating the tobacco product and that are present in the tobacco product.

[0029] In some preferred embodiments of tobacco products according to the present invention, the particles are made of ferrite. Ferrite is a ferromagnetic material with high magnetic permeability, making it particularly suitable as a susceptor material. The primary component of ferrite is iron. Other metallic components, such as zinc, nickel, manganese, or non-metallic components (e.g., silicon), may be present in varying amounts. Ferrite is a relatively inexpensive and commercially available material. Ferrite is available in particulate form in the size range of the particles used in tobacco products according to the present invention. Preferably, the particles are fully sintered ferrite powder, such as FP350 from Powder Processing Technology LLC (USA).

[0030] According to yet a further aspect of the tobacco product according to the invention, the Curie temperature of the susceptor is between about 200 degrees Celsius and about 450 degrees Celsius, preferably between about 240 degrees Celsius and about 400 degrees Celsius, for example about 280 degrees Celsius.

[0031] Particles containing susceptor materials having Curie temperatures within the indicated ranges can achieve a tobacco product with a fairly uniform temperature distribution and an average temperature of about 200° C. to 240° C. Furthermore, the local temperature of the aerosol-forming substrate generally does not exceed, or does not significantly exceed, the Curie temperature of the susceptor. Thus, the local temperature can be below about 400° C., below which significant combustion of the aerosol-forming substrate does not occur.

[0032] When the susceptor material reaches its Curie temperature, it changes magnetic properties. At the Curie temperature, the susceptor material changes from a ferromagnetic phase to a paramagnetic phase. At this point, heating due to energy losses caused by the orientation of the ferromagnetic domains ceases. Further heating is then primarily due to the formation of eddy currents, such that the heating process is automatically reduced upon reaching the Curie temperature of the susceptor material. Reducing the risk of overheating the aerosol-forming substrate can be supported by using a susceptor material with a Curie temperature, which ensures that the heating process due to hysteresis losses only reaches a certain maximum temperature. The susceptor material and its Curie temperature are preferably adapted according to the composition of the aerosol-forming substrate to achieve optimal temperatures and temperature distribution within the tobacco product for optimal aerosol generation.

[0033] According to one embodiment of the tobacco product of the present invention, the tobacco product is in the form of a rod having a rod diameter ranging from about 3 mm to about 9 mm, preferably from about 4 mm to about 8 mm, for example, 7 mm. The length of the rod may be from about 2 mm to about 20 mm, preferably from about 6 mm to about 12 mm, for example, 10 mm. The rod preferably has a circular or elliptical cross section, although the rod may also have a rectangular or polygonal cross section.

[0034] To facilitate easy handling of the tobacco rod by consumers, the rod may be provided in a tobacco stick comprising a rod, a filter, and a mouthpiece, which are sequentially formed. The filter may be made of a material capable of cooling the aerosol formed from the rod material and may also be capable of altering the components present in the formed aerosol. For example, if the filter is made of polylactic acid or a similar polymer, the filter may remove or reduce the level of phenol in the aerosol. The rod, filter, and mouthpiece may be surrounded by paper of sufficient stiffness to facilitate handling of the rod. The tobacco stick may be 20 mm to 55 mm long, preferably approximately 45 mm long.

[0035] Thus, in another aspect of the present invention, there is provided a unit containing tobacco material, such as, for example, a tobacco stick, which unit comprises a tobacco product as described herein and a filter, the tobacco product and filter being arranged end-to-end and wrapped in a sheet material (e.g., paper) to secure the filter and tobacco product within the unit containing tobacco material.

[0036] The invention will be further described with reference to embodiments, which are illustrated by the following diagrams. [Brief explanation of the drawings]

[0037] [Figure 1] FIG. 1 is a schematic diagram of a tobacco sheet having homogenized tobacco material and susceptor particles. [Figure 2] Figure 2 shows the temperature simulation of a tobacco plug made of a compressed homogenized tobacco sheet heated by a heating blade. [Figure 3] FIG. 3 shows a temperature simulation of a tobacco plug made with a tobacco sheet according to FIG. 1 with a uniform susceptor particle distribution. [Figure 4] FIG. 4 shows a simulation of the glycerin depletion profile of a tobacco plug according to FIG. [Figure 5] FIG. 5 shows a simulation of the glycerin depletion profile of a tobacco plug according to FIG. [Figure 6] FIG. 6 shows a simulation of the average temperature curve against time of a tobacco plug heated by a heating blade and having a uniform susceptor particle distribution, for example according to FIGS. DETAILED DESCRIPTION OF THE INVENTION

[0038] Figure 1 shows schematically an aerosol-forming substrate in the form of a tobacco sheet 1. The tobacco sheet comprises homogenized tobacco particles 11, preferably cast leaf as described above, and susceptor particles 10.

[0039] The tobacco sheet preferably has a thickness 12 of 0.8 to 1.5 millimeters, while the susceptor particles preferably have a size of 10 to 80 micrometers. To form tobacco products according to the present invention, the tobacco sheet 1 is crimped and folded to form a tobacco rod. Such a continuous rod is then cut to the required size for a tobacco plug to be used in combination with an induction heating device for aerosol generation.

[0040] FIG. 2 shows a simulated temperature distribution across a cylindrical tobacco plug 2 heated by a heating blade 20. The tobacco plug includes an aerosol-forming substrate made of a compressed tobacco sheet containing homogenized tobacco material and glycerin as an aerosol former. The compressed tobacco sheet, formed into a rod shape, is wrapped in a wrapper 23 (e.g., paper). A rectangular, resistively heatable heating blade 20 is inserted into the center of the tobacco plug to heat the aerosol-forming substrate. The temperature distribution is simulated in FIG. 2 for heating the plug to a core temperature of approximately 370°C at the center and at least 80°C at the periphery. The temperature in the proximal region 220 of the blade 20 reaches a maximum of approximately 380°C. The temperatures in the intermediate region 221 and the distal, peripheral region 222 are still at a minimum of approximately 100-150°C. Thus, simulation measurements show that the intermediate and peripheral regions of the blades of a heated tobacco plug are not involved in aerosol formation, or are involved to a limited extent, but only if the heating of the blades is limited so that the tobacco does not completely burn, at least in the proximal region 220.

[0041] This is also illustrated in Figure 4, which shows the depletion of glycerin in the tobacco plug according to Figure 2. After 5 minutes of heating, it can be seen that the proximal region 220 is completely depleted of glycerin. No depletion occurs in the peripheral region 222, while the intermediate region 221 is partially depleted. Due to the rectangular cross-sectional shape of the heating blade, the depleted peripheral region 222 is limited to a portion of the plug, which is aligned alongside the long sides of the blade 20. The proximal region 220 is aligned directly adjacent to the heating blade 20 and extends a maximum of approximately one-third of the radius to each long side of the blade 20.

[0042] Figure 3 shows a simulated diagram of the temperature distribution in the cross section of an inductively heated cylindrical tobacco plug 3. The tobacco plug is made of a compressed tobacco sheet containing susceptor particles as described in Figure 1. In the tobacco plug used for the temperature simulation, 90 milligrams of FP 350 ferrite particles with an average size of 50 micrometers are uniformly distributed within a cast leaf made of a slurry of tobacco particles, fibers, binder, and glycerin as an aerosol former.

[0043] The rod-shaped, crimped tobacco sheet is wrapped in a wrapper 13 (e.g., paper). Susceptor particles are uniformly distributed throughout the tobacco plug (not shown). The plug is heated via inductively heated susceptor particles. Figure 3 shows a simulation of temperature distribution, illustrating the uniform temperature of the plug, which would be expected based on uniformly distributed susceptor particles within the plug. The temperature of the central region 110 is approximately 300°C. The circular central region 110 is relatively large and extends over approximately half the radius of the tobacco plug. The temperature within the narrow, annular intermediate region 111 is approximately 250°C, while the temperature of the circumferentially arranged peripheral regions 112 is approximately 200°C. Thus, simulation measurements indicate that glycerin vaporizes relatively uniformly throughout the entire or substantially entire tobacco plug. Furthermore, glycerin vaporizes from both the intermediate region 111 and the peripheral region 112 of the tobacco plug. In this way, all areas of the tobacco plug are used in forming the aerosol, even with maximum heating temperatures that are much lower than those known from centrally and resistively heated tobacco plugs.

[0044] The glycerin depletion of the tobacco plug of Figure 3 is illustrated in Figure 5. It can be seen that the glycerin is not yet completely depleted in the central region 110 even after 5 minutes of heating, whereas some depletion has already occurred in the intermediate region 111 and to a lesser extent in the peripheral region 112.

[0045] The temperature and glycerin depletion simulations of the plug according to Figures 2 and 3 (but only for about 1 and 1.5 minutes of heating) show the same relative temperature behavior. After 1 minute, a tobacco plug according to the present invention has already reached a temperature of about 150-200 degrees Celsius over the central / middle region. Glycerin depletion has not yet begun. After 1.5 minutes, the temperature has risen to about 200 degrees Celsius in the inner periphery and up to about 280 degrees Celsius in the central region. The minimum temperature of 150 degrees Celsius is only present in the outer periphery 112. Thus, glycerin depletion occurs over a wide area of the tobacco plug already 1-2 minutes after heating of the tobacco plug begins.

[0046] In contrast to the tobacco plug with susceptor particles according to the present invention, the temperature distribution of the tobacco plug according to Fig. 2 with the heating blade is almost identical to that shown in Fig. 2 already after 1.5 minutes of heating. After 1.5 minutes of heating, the proximal region 220 already has a temperature of up to 380°C, and the intermediate and peripheral regions have a temperature of at least about 100°C. After 1 minute of heating, only the very narrow proximal region around the heating blade 20 is heated to about 200°C. The remaining regions have a slightly higher temperature or remain at room temperature.

[0047] FIG. 6 shows the average temperature T over the tobacco plug volume versus time t for the plugs shown in FIGS. 1 and 3. Line 35 shows the temperature curve for a tobacco plug with susceptor particles according to the present invention, while line 25 shows the temperature curve for a tobacco plug heated with a heating blade. While the maximum heating temperature of the heating blade was limited to 360°C, the Curie temperature of the susceptor in the tobacco plug according to the present invention was 350-400°C. It can be seen that in the plug with uniformly distributed particles, the average temperature rises much faster, gradually approaching a maximum average temperature of approximately 250°C. The average temperature rise for the blade-heated tobacco plug takes a little longer. The maximum average temperature for the blade-heated plug is approximately 220°C. A higher average temperature is not reached due to the surrounding areas not heated by the heating blade.

[0048] 1. An inductively heatable tobacco product for aerosol generation, the tobacco product comprising an aerosol-forming substrate including susceptors in the form of a plurality of particles, the aerosol-forming substrate being a compressed tobacco sheet comprising tobacco material, fibers, a binder, an aerosol former, and the susceptors in the form of the plurality of particles. 2. The tobacco product of 1, wherein the tobacco product has a heat loss of at least 0.008 joules per kilogram. 3. The tobacco product of claim 2, wherein the heat loss exceeds 0.05 joules per kilogram. 4. A tobacco product according to any one of 1 to 3, wherein the particle size of the plurality of particles is in the range of about 5 micrometers to about 100 micrometers. 5. A tobacco product according to any one of 1 to 4, wherein the amount of the plurality of particles is in the range of about 4 weight percent to about 45 weight percent of the tobacco product. 6. A tobacco product described in any one of 1 to 5, wherein the particles are uniformly distributed within the aerosol-forming substrate. 7. A tobacco product according to any one of 1 to 6, wherein the particles comprise a sintered material. 8. A tobacco product according to any one of 1 to 7, wherein the particles comprise a chemically inert outer surface. 9. A tobacco product according to any one of 1 to 6, wherein the particles are made of ferrite. 10. A tobacco product according to any one of 1 to 9, wherein the tobacco material is a homogenized tobacco material and the aerosol former comprises glycerin. 11. A tobacco product according to any one of 1 to 10, wherein the thickness of the crimped tobacco sheet is in the range of about 0.5 millimeters and about 2 millimeters. 12. A tobacco product according to any one of 1 to 11, wherein the Curie temperature of the susceptor is between about 200 degrees Celsius and about 400 degrees Celsius. 13. A tobacco product according to any one of 1 to 12, which has the form of a rod, the diameter of the rod being in the range of about 3 millimeters to about 9 millimeters, and the length of the rod being in the range of about 2 millimeters to about 20 millimeters. 14. A tobacco material comprising a unit comprising a tobacco product and a filter as described in any one of 1 to 13, in which the tobacco product and filter are arranged end-to-end and wrapped in a sheet material for fixing the filter and the tobacco product within the unit comprising the tobacco material.

Claims

1. 1. An inductively heatable tobacco product for aerosol generation, the tobacco product comprising an aerosol-forming substrate including a susceptor in the form of a plurality of magnetic particles, the aerosol-forming substrate also comprising an aerosol former including tobacco material, fiber, a binder, and glycerin, the particle size of the plurality of magnetic particles ranging from 5 micrometers to 100 micrometers, the amount of the plurality of magnetic particles being about 10 weight percent to about 40 weight percent of the tobacco product, and the susceptor undergoing a phase change from a ferromagnetic phase to a paramagnetic phase at the Curie temperature.

2. 10. The tobacco product of claim 1, wherein the particle size of the plurality of magnetic particles ranges from 10 micrometers to 80 micrometers.

3. 3. The tobacco product of claim 2, wherein the particle size of the plurality of magnetic particles ranges from 20 micrometers to 50 micrometers.

4. A tobacco product according to any one of claims 1 to 3, wherein the magnetic particles are uniformly distributed within the aerosol-forming substrate.

5. 5. The tobacco product of any one of claims 1 to 4, wherein the tobacco product has a heat loss of at least 0.008 joules per kilogram.

6. 6. The tobacco product of claim 5, wherein the heat loss is greater than 0.05 joules per kilogram.

7. 7. The tobacco product of claim 6, wherein the heat loss exceeds 0.1 joules per kilogram.

8. A tobacco product according to any one of claims 1 to 7, wherein the magnetic susceptor particles comprise a sintered material or are made of ferrite or are made of sintered ferrite.

9. 9. The tobacco product according to any one of claims 1 to 8, wherein the tobacco material is a homogenized tobacco material.

10. 10. The tobacco product of claim 9, wherein the tobacco material comprises tobacco particles ranging in size from 30 micrometers to 250 micrometers.

11. 11. The tobacco product according to any one of claims 1 to 10, wherein the susceptor has a Curie temperature of 200 degrees Celsius to 400 degrees Celsius.

12. 12. A tobacco product according to any one of claims 1 to 11, in the form of a rod, the diameter of the rod being in the range of 3 mm to 9 mm and the length of the rod being in the range of 2 mm to 20 mm.

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