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CN-122028808-A - Coated heating element for aerosol generating device

CN122028808ACN 122028808 ACN122028808 ACN 122028808ACN-122028808-A

Abstract

A heating element for heating an aerosol-forming substrate of an aerosol-generating article received in an aerosol-generating device is disclosed, the heating element comprising a heating base element configured to heat the aerosol-forming substrate by means of at least thermal radiation, and a coating material, such as aluminium nitride, disposed on the heating base element. The coating material is configured to increase the amount of thermal radiation absorbed by a first chemical component of the aerosol-forming substrate (such as nicotine, propylene glycol or glycerin) and to decrease the amount of thermal radiation absorbed by a second chemical component of the aerosol-forming substrate (such as water). The heating element may be an internal heating element of the aerosol-generating device or may be an external susceptor of the aerosol-generating article.

Inventors

  • MCEVOY JAMES
  • A. WHITE
  • J. Meiwuteng

Assignees

  • 日本烟草国际股份公司

Dates

Publication Date
20260512
Application Date
20241017
Priority Date
20231019

Claims (18)

  1. 1. A heating element for heating an aerosol-forming substrate of an aerosol-generating article received in an aerosol-generating device, the heating element comprising: a heating base element configured to heat the aerosol-forming substrate at least by means of thermal radiation, and A coating material disposed on the heating base element; wherein the coating material is configured to increase an amount of heat radiation provided to the one or more first components of the aerosol-forming substrate compared to an identical heated base element without the coating material, Wherein the coating material is configured to reduce an amount of heat radiation provided to at least one second component of the aerosol-forming substrate compared to an identical heated base element without the coating material, Wherein the at least one second component is preferably water contained in the aerosol-forming substrate.
  2. 2. Heating element according to the preceding claim, wherein the one or more first components are nicotine, propylene glycol PG and/or plant glycerol VG comprised by the aerosol-forming substrate.
  3. 3. Heating element according to any one of the preceding claims, wherein the coating material comprises one or more of metal, ceramic, polymer, glass, and preferably aluminum nitride AlN.
  4. 4. A heating element according to any one of the preceding claims, wherein the coating material is a non-aerosol-forming material.
  5. 5. A heating element according to any one of the preceding claims, wherein the coating material is an inert material.
  6. 6. A heating element according to any one of the preceding claims, wherein the coating material is configured to have a radiant heat emission spectrum when heated to at least 100 ℃, preferably at least 200 ℃, most preferably at least 250 ℃, similar to the radiant heat absorption spectrum of one or more of nicotine, propylene glycol PG, vegetable glycerin VG to a greater extent than the radiant heat emission spectrum of the material of the heating base element.
  7. 7. A heating element according to any one of the preceding claims, wherein the coating material is configured to have a radiant heat emission spectrum with wavelengths close to the highest emission energy when heated to at least 100 ℃, preferably at least 200 ℃, most preferably at least 250 ℃, which wavelengths are closer to the highest radiant heat absorption wavelength of one or more of nicotine, propylene glycol PG, plant glycerol VG than the material of the heating base element.
  8. 8. A heating element according to any one of the preceding claims, wherein the coating material has a greater thermal conductivity than the material of the heating base element.
  9. 9. A heating element according to any of the preceding claims, wherein the thermal conductivity of the coating material is preferably at least 100W/(m K), preferably at least 150W/(m K), more preferably at least 200W/(m K), more preferably at least 250W/(m K), more preferably at least 300W/(m K), when measured at room temperature, such as 20 ℃ or 25 ℃.
  10. 10. The heating element according to any of the preceding claims, wherein the coating material has an average thickness of at least 1 micrometer (μm), preferably at least 2 μm, more preferably at least 5 μm, more preferably at least 10 μm, more preferably at least 20 μm, more preferably at least 30 μm, more preferably at least 40 μm, most preferably at least 50 μm, and/or At most 200 μm, preferably at most 150 μm, more preferably at most 100 μm, more preferably at most 80 μm, more preferably at most 60 μm, most preferably at most 50 μm.
  11. 11. A heating element according to any one of the preceding claims, wherein the coating material is provided on an outer surface of the heating base element.
  12. 12. Heating element according to the preceding claim, wherein the coating material covers at least 50%, preferably at least 60%, more preferably at least 70%, more preferably at least 80%, more preferably at least 90%, more preferably at least 95%, most preferably substantially 100% of the outer surface of the heating base element.
  13. 13. A heating element according to any one of the preceding claims, wherein the heating base element has the shape of a strip, cylinder, rod, vane or pin.
  14. 14. A heating element according to any one of the preceding claims, wherein the heating element is a susceptor.
  15. 15. Heating element according to any one of the preceding claims, wherein the heating base element forms a closing element, in particular without holes or without through holes.
  16. 16. An aerosol-generating article, the aerosol-generating article comprising: a heating element according to any one of the preceding claims, and Tobacco segments; Wherein the heating element is arranged in or on the periphery of the tobacco segment.
  17. 17. An aerosol-generating device configured to receive an aerosol-generating article, the aerosol-generating device comprising: a heating element according to any one of claims 1 to 9, 11 or 14, and A power supply configured to heat the heating element, preferably by an electromagnetic field provided by an inductor coil, wherein the heating element is configured to heat an aerosol-forming substrate of the aerosol-generating article.
  18. 18. An aerosol-generating system, the aerosol-generating system comprising: An aerosol-generating article according to claim 15, and An aerosol generating device.

Description

Coated heating element for aerosol generating device Technical Field The present invention relates to a heating element for heating an aerosol-forming substrate of an aerosol-generating article received in an aerosol-generating device. The heating element includes a coating material configured to increase an amount of thermal radiation provided to the aerosol-forming substrate. The invention also relates to a corresponding aerosol-generating article comprising such a heating element. Furthermore, the invention relates to an aerosol-generating device and an aerosol-generating system. Background Aerosol generating devices, particularly electronic nicotine delivery systems (known as end), have been popular worldwide over the past few decades. These devices are alternatives to traditional combustible tobacco products, such as cigarettes. There are several types of aerosol-generating devices on the market today, which are based on different aerosolization techniques and aerosol-generating substrates. A particular subset of aerosol-generating devices are heated tobacco products, also known as "heated non-combustion" products and/or Systems (HNBs). These HNB systems can produce inhalable aerosols by heating a tobacco-containing substrate (typically in solid or powdered form). Such HNB systems require electronics that include a heating unit to heat the tobacco-containing substrate rather than burn the tobacco as is done in conventional cigarettes. Some aerosol-generating devices are provided with a heating cavity or furnace in which an aerosol-generating article (or consumable) comprising tobacco may be inserted. The consumable tobacco is then heated until an aerosol is formed. The oven generates a high temperature of between about 250 ℃ and 400 ℃, which promotes rapid formation of aerosols that can be inhaled by the user. Among aerosol generating devices, there are also liquid-based devices (known as e-cigarettes oils) in which a liquid is contained in a reservoir. The liquid may or may not contain nicotine to produce an aerosol to be inhaled by the user. These liquid-based aerosol generating devices are convenient for users seeking to generate an inhalable aerosol on-the-fly. In liquid-based aerosol-generating devices, some devices work with a consumable article, cartridge, or capsule received in the device. Consumable articles are typically equipped with a reservoir for a liquid, and a heating element. During use, for example, when a user draws on a mouthpiece of the device, liquid is directed from the reservoir towards the heating element to produce an inhalable aerosol. The heating element may be heated, for example using a coil. Typically, a wick is applied to transport liquid from the reservoir to the heating element. All of the above aerosol generating devices require heating of the consumable. There are three main modes of heat transfer, conduction heat transfer, convection heat transfer and radiant heat transfer. Conductive heat transfer is the most common and commonly used way in HNB devices. Convective heat transfer is rarely used due to its generally low efficiency. Radiant heat transfer is not generally used as the primary mode, but may sometimes occur, particularly when the heating element exhibits a relatively high temperature. The manner in which radiant heat transfer is emitted and absorbed is different than conductive heat transfer and/or convective heat transfer because radiation has a dependence on source and target depending on the wavelength of the radiation. Furthermore, the dominant wavelength emitted by the heat transfer source depends on the material employed by the source, the composition of the material, and in particular on the coating disposed on the source. Furthermore, the radiation depends on thickness and temperature. Currently known aerosol generating devices may provide thermal radiation, however, such radiant heat transfer is not optimal. In particular, heating of specific components in the consumable, such as Propylene Glycol (PG), vegetable Glycerin (VG), flavors, nicotine, water, etc., is not considered. This makes the heating process inefficient. Further, known heating elements (such as susceptors) are subject to overheating due to their relatively small mass and high power input. This may trigger local temperature peaks, which may lead to ignition of the aerosol-forming substrate. Further prior art is known from WO 2021/218679A, CN 112 369 716, EP 4 091 478 A1 and EP 4 159 060 A1. Accordingly, there is a need for improvements in aerosol generating devices that are capable of providing heat to a consumable, particularly by radiation. Against this background, it is an object of the invention to improve the aerosol-generating devices known to date. In particular, it is an object of the present invention to provide a heating element for heating an aerosol-forming substrate of an aerosol-generating article, which heating element allows for improved radiant heat transfer. The he