Aerosol generator, heater for aerosol generator, and manufacturing method

Abstract

This application provides an aerosol generating device, a heater for an aerosol generating device, and a manufacturing method thereof. The aerosol generating device includes a cavity for receiving an aerosol-generating product, an electrically insulating substrate having a tubular configuration that surrounds or defines the cavity, and a heating element coupled to the substrate and surrounding at least a portion of the substrate, the substrate and the heating element being thermally conductive to each other. During use, the substrate generates heat from the heating element, thereby heating the aerosol-generating product. The substrate is made of at least one of ceramic, glass, and quartz, and the substrate has a wall thickness of less than 0.2 mm. The aerosol generating device uses an ultra-thin substrate with a wall thickness of less than 0.2 mm, which makes it more sensitive to temperature increases and decreases during the heating process, which is advantageous for reducing energy consumption.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed with the China Patent Office on November 24, 2022, bearing application number 202211480500.0 and entitled "Aerosol generating device, heater for aerosol generating device and manufacturing method," the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE INVENTION Embodiments of the present invention relate to the technical field of heated non-combustion aerosol generation, and more particularly to aerosol generating devices, heaters for aerosol generating devices, and methods of manufacture. [Background technology]

[0003] Tobacco products (e.g., cigarettes, cigars, etc.) burn tobacco to produce tobacco smoke during use. As an alternative to these combustible tobacco products, attempts have been made to produce products that release compounds without combustion.

[0004] Examples of such products include heating devices that release compounds by heating, rather than burning, a material. For example, the material can be an aerosol-generating product containing tobacco or other non-tobacco products, which may or may not contain nicotine. Conventional heating devices heat the tobacco or other non-tobacco product by surrounding it with a ceramic-based heater, which is fabricated by printing resistive heating tracks onto a ceramic tube as the substrate. Summary of the Invention

[0005] One embodiment of the present application is an aerosol generating device arranged to heat an aerosol-generating product to generate an aerosol, comprising: a cavity for receiving an aerosol-generating product; an electrically insulating substrate configured in a tubular shape that surrounds or defines the cavity; a heating element coupled to the substrate and surrounding at least a portion of the substrate; the substrate and the heating element are thermally conductive with each other, and in use the substrate receives heat from the heating element and generates heat to heat the aerosol-generating product; The aerosol generating device is provided, wherein the substrate comprises at least one of ceramic, glass, and quartz, and the substrate has a wall thickness of less than 0.2 mm.

[0006] In some implementations, the substrate does not include elemental metals.

[0007] In some implementations, the substrate has a wall thickness of 0.1 to 0.2 mm.

[0008] In some implementations, the substrate is a tubular precursor that has been cylindrically ground on a cylindrical grinder to thin the tube wall.

[0009] In some implementations, the substrate has a bending strength of greater than 40 N at all test locations when tested according to a three-point bending strength test method.

[0010] In some implementations, the heating element includes a heating layer formed on or coupled to a substrate.

[0011] In some implementations, the heating layer is configured in an annular shape that surrounds the substrate.

[0012] In some implementations, the substrate includes first and second longitudinally spaced ends; a first electrode coupled to the substrate and positioned proximate the first end; a second electrode coupled to the substrate and positioned proximate the second end; The heating layer extends between the first and second electrodes and is configured to conduct a current longitudinally through the heating layer by the first and second electrodes.

[0013] In some implementations, when the first and second electrodes conduct current longitudinally through the heating layer, the resistance of the heating layer is between 0.5 Ω and 3 Ω.

[0014] In some implementations, the substrate is configured to heat from room temperature to 320° C. in 30 seconds when the heating element is heated with a supplied power of 30 W.

[0015] Yet another embodiment of the present application is an electrically insulating substrate configured in a tubular shape; a heating element coupled to the substrate and surrounding at least a portion of the substrate; The present invention further provides a heater for an aerosol generating device, wherein the substrate and the heating element are thermally conductive to each other, and during use, the substrate can generate heat by receiving heat from the heating element, the substrate including at least one of ceramic, glass, and quartz, and having a tube wall thickness of less than 0.2 mm.

[0016] Yet another embodiment of the present application is A quartz tube; an infrared emitting coating formed on the quartz tube, surrounding at least a portion of the quartz tube, and used to radiate infrared rays into a tubular hollow portion of the quartz tube; The present invention further provides a heater for an aerosol generating device, wherein the quartz tube has a tube wall thickness of less than 0.2 mm.

[0017] Yet another embodiment of the present application is obtaining a tubular precursor comprising at least one of ceramic, glass, and quartz and having a tube wall thickness greater than 0.2 mm; grinding the precursor with a cylindrical grinder until the wall thickness is less than 0.2 mm to obtain an electrically insulating substrate; forming a heating element on the substrate.

[0018] The above aerosol generator uses an ultra-thin substrate with a tube wall thickness of less than 0.2 mm, which makes the temperature rise or fall more sensitive during the heating process, which is advantageous for reducing energy consumption. [Brief explanation of the drawings]

[0019] One or more embodiments are illustratively described in the accompanying drawings, but these illustrative descriptions are not intended to limit the embodiments. Elements in the drawings with the same reference numerals are similar elements, and unless otherwise specified, the figures in the drawings are not to scale.

[0020] [Figure 1] 1 is a schematic diagram of an aerosol generating device provided in one embodiment. [Figure 2] FIG. 2 is a structural schematic diagram of an embodiment of the heater in FIG. 1. [Figure 3] 3 is an exploded schematic view of the heater in FIG. 2 from one viewpoint. FIG. [Figure 4] FIG. 3 is a temperature field distribution diagram in the heating process of the heater in FIG. 2. [Figure 5] FIG. 2 is a structural schematic diagram of another embodiment of the heater in FIG. [Figure 6] 1A and 1B are schematic diagrams illustrating a substrate thinning process in one embodiment. [Figure 7] 5A to 5C are schematic diagrams illustrating a substrate thinning process according to another embodiment. [Figure 8] FIG. 10 is a comparison diagram of the temperature rise rate before and after thinning of a substrate by cylindrical grinding in one example. [Figure 9] 1 is a schematic diagram of a heating curve of an aerosol-generating product in one embodiment. [Figure 10] 10A and 10B are schematic diagrams illustrating the manufacturing process of a heater according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to facilitate understanding of the present application, the present application will now be described in more detail with reference to the drawings and specific embodiments.

[0022] One embodiment of the present application provides an aerosol generating device 100, as shown in FIG. 1, that heats an aerosol-generating product 1000, such as a cigarette, rather than burning it, thereby volatilizing or releasing at least one component of the aerosol-generating product 1000 to form an aerosol for inhalation.

[0023] In further alternative implementations, the aerosol-generating product 1000 preferably employs a tobacco-containing material that releases volatile compounds from the matrix upon heating, or may be a non-tobacco material that is suitable for electrical heating to generate smoke after heating. The aerosol-generating product 1000 preferably employs a solid matrix, which may include one or more of powders, granules, shreds, strips, or sheets of one or more of vanilla leaf, dried flowers, volatile flavor herbaceous crops, tobacco leaf, homogenized tobacco, and expanded tobacco, or the solid matrix may include additional tobacco or non-tobacco volatile flavor compounds that are released upon heating of the matrix.

[0024] Also, as shown in FIG. 1, after the aerosol-generating product 1000 is received in the aerosol-generating device 100, a part of the aerosol-generating product 1000, such as a filter, is exposed to the outside of the aerosol-generating device 100, which is convenient for the user to inhale.

[0025] As shown in FIG. 1, the structure of the aerosol generating device according to one embodiment of the present application is such that the entire outer shape of the device is substantially flat and cylindrical. The external members of the aerosol generating device 100 are: The aerosol generating device includes a housing 10 that essentially defines the exterior of the device, has an internal hollow structure, and provides assembly space available for necessary functional components such as electronic devices and a heater. The housing 10 has longitudinally opposed proximal and distal ends 110 and 120, where, during use, the proximal end 110 is the end closest to the user for manipulating and containing the aerosol generating product 1000 to facilitate heating and drawing, and the distal end 120 is the end farther from the user, wherein: The proximal end 110 is provided with a receiving port 111 through which the aerosol-generating product 1000 can be received into the housing 10 and heated or removed from the housing 10; The distal end 120 is provided with an intake hole 121 for allowing outside air to enter the housing 10 during drawing.

[0026] In some examples, the outer housing may be formed from a metal or alloy, such as stainless steel, aluminum, etc. Other suitable materials include various plastics (e.g., polycarbonate), metal-plating over plastic, ceramic, etc.

[0027] Further, as shown in FIG. 1, the aerosol generating device 100 includes: It further includes a cavity for containing or receiving the aerosol-generating product 1000 , and during use the aerosol-generating product 1000 can be removably received within the cavity via the receiving opening 111 .

[0028] As shown in FIG. 1, the aerosol generating device 100 includes: It further includes an air passageway 150 located between the cavity and the air inlet 121, and as further shown by arrow R11 in FIG. 1, during use, the air passageway 150 provides a passageway from the air inlet 121 into the cavity / aerosol-generating product 1000.

[0029] Further, as shown in FIG. 1, the aerosol generating device 100 includes: a power supply battery cell 130, preferably a rechargeable DC battery cell 130, which can be charged by an external power source; It further includes a circuit board 140 on which circuitry is disposed or integrated to control the heating or operation of the aerosol generating device 100.

[0030] Further, as shown in FIG. 1, the aerosol generating device 100 includes: The housing 10 further includes a heater 30 that at least partially surrounds and defines the cavity, such that when the aerosol-generating product 1000 is received within the housing 10, the heater 30 at least partially surrounds or encloses the aerosol-generating product 1000 and heats the aerosol-generating product 1000 from the periphery. Additionally, when the aerosol-generating product 1000 is received within the housing 10, the aerosol-generating product 1000 is at least partially contained and held within the heater 30.

[0031] Further, as shown in FIG. 2, the heater 30 is basically configured in a vertically elongated tubular shape. The aerosol-generating product 1000 includes a tubular substrate 31 made of a material with high thermal conductivity, such as ceramic, glass, or quartz. A cavity for receiving and holding the aerosol-generating product 1000 during use is at least partially defined by the substrate 31. The substrate 31 is electrically insulating. In some implementations, the substrate 31 does not include a single metal, or does not include a single metal or alloy tube, such as an aluminum tube, a stainless steel tube, or a copper tube. In some implementations, the tubular substrate 31 has a length of approximately 15 to 60 mm and an inner diameter of approximately 5.4 to 7.8 mm. In some specific implementations, the ceramic substrate 31 may include at least one of ceramic oxides or ceramic nitrides, such as aluminum oxide, silicon oxide, boron oxide, zirconium oxide, or iron oxide. The substrate 31 made of these glass or ceramic materials has a thermal conductivity of approximately 1 to 30 W / mK.

[0032] In some other implementations, the length of the aerosol-generating product 1000 encompassed or surrounded by the substrate 31 is greater than 30 mm.

[0033] Further, as shown in FIG. 2, the heater 30 It further includes a heating element 32 that at least partially surrounds or encloses the substrate 31. During use, the substrate 31 receives or transfers heat from the heating element 32, thereby heating the aerosol-generating product 1000.

[0034] In some implementations, the heating element 32 includes a resistive heating element, which generates heat by resistive Joule heating when a direct current (DC) is passed through the heating element 32. In some implementations, the heating element 32 is made of a metal, metal alloy, graphite, carbon, conductive ceramic, or a composite of another ceramic material and a metal material, having an appropriate impedance. Suitable metal or alloy materials include at least one of nickel, cobalt, zirconium, titanium, nickel alloy, cobalt alloy, zirconium alloy, titanium alloy, nickel-chromium alloy, nickel-iron alloy, iron-chromium alloy, iron-chromium alloy, iron-chromium-aluminum alloy, iron-manganese-aluminum-based alloy, or stainless steel. Alternatively, in some alternative implementations, the heating element 32 may further include an electromagnetic induction heating element or an infrared heating element.

[0035] In the above implementations, the heating element 32 is thermally conductive with the substrate 31. The substrate 31 generates heat by receiving heat from the heating element 32, thereby heating the aerosol-generating product 1000 received within the substrate 31. In this implementation, the heating element 32 itself may generate heat by resistive Joule heating or by induction heating. Alternatively, in some other implementations, the substrate 31 is infrared-transparent and the heating element 32 is an electric infrared-emitting coating, which, when supplied with electric current, can heat the aerosol-generating product 1000 by emitting infrared radiation that passes through the substrate 31 and is received by the aerosol-generating product 1000.

[0036] In some implementations, the infrared emitting layer is made of an oxide of at least one metal element, such as Mg, Al, Ti, Zr, Mn, Fe, Co, Ni, Cu, Cr, or Zn. This metal oxide coating can emit far-infrared rays when heated to an appropriate temperature by passing an electric current through it. The thickness of the infrared emitting layer can be controlled to be preferably 30 μm to 50 μm. The infrared emitting layer can be formed on the surface of the substrate 31 by spraying the oxide of the above metal element onto the outer surface of the tubular substrate 31 using atmospheric plasma spraying and then curing it.

[0037] Alternatively, in some other variant implementations, the heater 30 may include only a heating element 32 that surrounds or defines a cavity to contain the aerosol-generating product 1000 and transfer heat directly to the aerosol-generating product 1000 to heat it.

[0038] 2 and 3, the heating element 32 is configured in a cylindrical shape that surrounds or encircles the outside of the substrate 31. The extension size of the heating element 32 in the length direction of the heater 30 is smaller than the extension size of the substrate 31. For example, in some specific implementations, the heating element 32 has a length of more than 20 to 50 mm. Specifically, for example, as shown in FIG. 2, the heater 30 includes a first end 310 and a second end 320 that are spaced apart in the length direction, and in specific implementations, the first end 310 and the second end 320 are defined by both ends of the substrate 31 in the length direction.

[0039] The heating element 32 and the first end 310 have a separation distance 313 of approximately 3 to 10 mm, and the heating element 32 and the second end 320 have a separation distance 314 of approximately 3 to 10 mm. After assembly, the heating element 32 does not completely cover or surround the outer surface of the substrate 31, so that the outer surface of the substrate 31 has a first exposed area defined by the separation distance 313 near the first end 310. The outer surface of the substrate 31 has a second exposed area defined by the separation distance 314 near the second end 320. During assembly, a clamping or support member, such as a PEEK ring, is provided within the aerosol generating device 100 to support the heater 30 by coupling to the first exposed area defined by the separation distance 313 and the second exposed area defined by the separation distance 314.

[0040] 2 and 3, the heating element 32 is a resistive heating layer formed on the outside of the tubular substrate 31 by spraying, deposition, or the like. In this embodiment, the resistive heating layer is annular and surrounds at least a portion of the substrate 31. In this embodiment, the resistive heating layer is closed in the circumferential direction of the heater 30. In some implementations, the heating element 32, which is a resistive heating layer formed by spraying, deposition, or the like, may include nickel-chromium alloy, nickel-iron alloy, platinum, tungsten, silver, conductive ceramic, or the like. The thickness of the resistive heating layer of the heating element 32 may be approximately 0.05 to 0.5 mm. In some implementations, by selecting the material and thickness of the resistive heating layer, it is advantageous to achieve a resistance of approximately 0.5 Ω to 3 Ω when a current is conducted longitudinally through the resistive heating layer using the annular first electrode 371 and second electrode 372.

[0041] Furthermore, as shown in FIGS. 2 and 3, the heater 30 is It is used to supply power to the heating element 32, and further includes a first electrode 371 and a second electrode 372 which may be an electrode ring, an electrode cap, or an electrode coating formed by spraying, deposition, etc., and which are annular and surround the heating element 32, wherein: A first electrode 371 is located near a first end 321 of the heating element 32, at least partially surrounds the heating element 32, and makes conductive contact with the heating element 32, and a second electrode 372 is located near a second end 322 of the heating element 32, at least partially surrounds the heating element 32, and makes conductive contact with the heating element 32. The first electrode 371 is connected to the circuit board 140 via a welded conductive lead 331, and the second electrode 372 is connected to the circuit board 140 via a welded conductive lead 332, and conducts current along the length of the heating element 32.

[0042] In addition, by selecting the material and thickness of the heating element 32 in practice, when current is conducted in the longitudinal direction of the heating element 32 based on the annular first electrode 371 and second electrode 372, it is advantageous that the resistance value of the heating element 32 is approximately 0.5Ω to 3Ω.

[0043] Alternatively, in some alternative implementations, the heating element 32 may include a heating mesh that is wrapped around or encases the outside of the substrate 31 .

[0044] Furthermore, as shown in FIGS. 2 and 3, the heater 30 is Further included is a temperature sensor 34 , such as a thermistor temperature sensor PT1000 or a thermocouple, coupled to the heating element 32 and used to sense the temperature of the heating element 32 and / or heater 30 .

[0045] In this embodiment, the coupling position or temperature measurement position between the temperature sensor 34 and the heating element 32 is essentially the longitudinal center of the heating element 32, or the distance from the coupling position between the temperature sensor 34 and the heating element 32 to the first end 321 of the heating element 32 is approximately 1 / 3 to 1 / 3 of the length of the heating element 32. In some specific embodiments, the coupling position between the temperature sensor 34 and the heating element 32 is essentially close to or located at the longitudinal center of the heating element 32, so that the temperature sensor 34 is essentially located at the hottest area of ​​the heating element 32. For example, FIG. 4 shows a temperature field distribution diagram of a heating element 32, which is a sprayed resistive heating layer, during operation. As can be seen from FIG. 4, the hottest area of ​​the heating element 32 is essentially close to or located at the longitudinal center, and the temperature of the central area is significantly higher than that of the areas near both ends.

[0046] In some other implementations, the heater 30 is The heater 30 further includes a surface insulating layer formed on the outside of the heating element 32 and / or the first electrode 371 and / or the second electrode 372 by spraying, deposition, coating, or the like, to insulate them from the outer surface of the heater 30. In some implementations, the surface insulating layer is a glaze layer or the like formed by spraying, deposition, or the like.

[0047] Alternatively, FIG. 5 shows a schematic diagram of another embodiment of the heater 30, in which the heater 30 is an electrically insulating substrate 31a configured in a tubular shape surrounding or defining a cavity and having third and fourth longitudinally spaced ends 310a and 320a; The circuit board 140 further includes a resistive heating track 32a that is bonded to the outer surface of the substrate 31a by a process such as screen printing, spraying, or deposition, and that extends or bends to a first end 321a and a second end 322a, and that is connected at both ends to the circuit board 140 by welding lead wires, or the like, and that can generate heat by resistive Joule heating when an electric current flows through it.

[0048] Additionally, the resistive heating track 32a is a serpentine track and the outer surface of the substrate 31a includes blank areas 311a defined by the resistive heating track 32a for attaching temperature sensors or the like.

[0049] Furthermore, in practice, the wall thickness of the substrate 31 / 31a made of ceramic, glass or quartz is 0.1 to 0.2 mm, which makes the substrate 31 / 32a more sensitive to temperature rise or fall control during the heating process.

[0050] In some embodiments, substrates 31 / 31a having these specific wall thicknesses cannot be manufactured by currently common injection molding or drilling machining processes. Furthermore, FIG. 6 shows a schematic diagram of one embodiment for manufacturing an ultra-thin-wall substrate 31 / 31a having a wall thickness of 0.1-0.2 mm. In the embodiment shown in FIG. 6, the substrate 31 / 31a is injection-molded from a ceramic raw material into a mold, and then ground from its outer surface using a centerless external cylindrical grinding process to reduce its wall thickness to 0.1-0.2 mm. Here, the term "centerless external cylindrical grinding" is a machining term that refers to a grinding method in the field of machining in which a workpiece is placed directly between a grinding wheel and a guide wheel on a centerless external cylindrical grinding machine without being clamped, and is supported by a blade and / or guide wheel. The outer surface of the workpiece to be ground serves as the positioning reference plane for grinding the outer periphery of the workpiece. For example, in the embodiment shown in FIG. 6, the substrate 31 / 31a is ground from the outer periphery of the substrate 31 / 31a by grinding wheels 1 and 2 of a centerless external cylindrical grinding machine, and the substrate 31 / 31a is supported and rotationally guided by the blade and / or guide wheel 4 of the centerless external cylindrical grinding machine.

[0051] The outer peripheral surface of the substrate 31 / 31a is ground using a centerless external cylindrical grinding machine, and the tubular substrate 31 / 31a, which has a wall thickness of more than 0.6 mm and is obtained by injection molding and then sintering ceramic raw materials, is ground until the wall thickness is 0.1 to 0.2 mm.

[0052] Alternatively, in some implementations, as shown in Figure 7, a centerless internal cylindrical grinding machine may be used to insert or place at least one grinding wheel into a substrate 31 / 31a for grinding. Grinding wheel 1a enters the substrate 31 / 31a and is coupled to the inner circumferential surface of the substrate 31 / 31a, while grinding wheel 2a abuts against the outer circumferential surface of the substrate 31 / 31a to perform grinding. Furthermore, in centerless internal cylindrical grinding, the substrate 31 / 31a is supported and rotated by guide wheels 4a and 5a. Using the internal cylindrical grinding machine, a tubular substrate 31 / 31a with a wall thickness of more than 0.6 mm, which is made by injection molding a ceramic raw material in a mold and then sintering, is ground until the wall thickness reaches 0.1 to 0.2 mm.

[0053] Furthermore, in practice, in accordance with the three-point bending strength test standard GBT6569-2006, a strength test was carried out on the alumina ceramic substrate 31 / 31a with a tube wall of 0.18 mm and the alumina ceramic substrate 31 / 31a with a tube wall of 0.6 mm using a three-point bending strength tester. The test results for the strength of the upper, middle and lower end points in the three-point bending strength test are shown in the table below. JPEG2025536811000002.jpg82158

[0054] In the three-point bending strength test, the strength of the ceramic tube substrate 31 / 31a, which is directly injection molded and sintered, is significantly reduced after cylindrical grinding to thin the tube wall to 0.18 mm. Furthermore, the compressive strength of all test sections of the thinned substrate 31 / 31a remains above 40 N, making it perfectly feasible to deposit or spray the heating element 32, which is a resistance heating layer or track.

[0055] FIG. 8 shows the temperature rise curves of the heater 30 using an alumina ceramic substrate 31 / 31a with a 0.18 mm wall thickness and an alumina ceramic substrate 31 / 31a with a 0.6 mm wall thickness in one embodiment. In the comparison shown in FIG. 8, the inner diameter of the substrate 31 / 31a is 5.7 mm, the length is 49 mm, and the power supplied to the heater 30 is 30 W. From the comparison results in FIG. 8, it can be seen that the alumina ceramic substrate 31 / 31a with a 0.18 mm wall thickness took approximately 29 seconds to heat up from room temperature to the target temperature of 320°C, while the alumina ceramic substrate 31 / 31a with a 0.6 mm wall thickness took approximately 48 seconds to heat up from room temperature to the target temperature of 320°C. Furthermore, the heater 40 using the 0.18 mm alumina ceramic substrate 31 / 31a has a faster temperature response. The alumina ceramic substrate 31 / 31a with a tube wall thickness of 0.18 mm takes less than 30 seconds to heat up from room temperature to the target temperature of 320°C.

[0056] 9 is a schematic diagram of a heating curve within a predetermined time period of the aerosol-generating product 1000 in one embodiment. As shown in FIG. 9, the predetermined time period is set based on the amount of aerosol that can be generated from the aerosol-generating product 1000 and the inhalation time allowed by the user (e.g., about 4 minutes). The heating curve having the predetermined time period is also A time step S1 (0 to t1 time, for example, about 10 seconds) in which the temperature is rapidly increased from room temperature to a first target temperature T1 of, for example, 350 ° C. for preheating; A time step S2 (t1 to t2, for example, may be about 5 seconds) in which the temperature is reduced from the first target temperature T1 to a second target temperature T2, for example, 320°C; The aerosol-generating product 1000 is basically maintained at a second target temperature T2, heated to generate an aerosol for inhalation, and after inhalation is completed, the power supply to the heater 30 is stopped and the product is allowed to cool naturally (time period from t2 to t3, which may be, for example, approximately 230 s).

[0057] In addition, in some other implementations of the present application, the same aerosol-generating product 1000 was heated according to the heating curve having a predetermined time shown in Figure 9 for heaters 30 using an alumina ceramic substrate 31 / 31a with a tube wall of 0.6 mm and an alumina ceramic substrate 31 / 31a whose tube wall had been thinned to 0.18 mm by a cylindrical grinding process, and the comparative results of the measured energy consumption are shown in the table below. JPEG2025536811000003.jpg80161

[0058] From the above comparison of energy consumption, when heating the aerosol-generating product 1000 according to a predetermined temperature curve with a heating and inhalation time of about 240 seconds, the energy consumption of the heater 30 using the alumina ceramic substrate 31 / 31a with a tube wall of 0.18 mm is lower, about 60 to 70 J lower than the energy consumption of the heater 30 using the alumina ceramic substrate 31 / 31a with a tube wall of 0.6 mm. A heater 30 using a substrate 31 / 31a with a tube wall of less than 0.2 mm after thinning is advantageous in reducing energy consumption.

[0059] 10 shows a schematic diagram of manufacturing a heater 30 using a substrate 31 / 31a having a tube wall thickness of less than 0.2 mm in another embodiment. In FIG. 10, the manufacturing of the heater 30 includes: obtaining raw materials for forming the substrate 31 / 31a, such as ceramic powder, glass powder, quartz powder, etc., and mixing the raw materials with a liquid aid for a tape casting process to form a flowable slurry; tape-casting the slurry in a tape-casting device to form a thin film 31b having a thickness of less than 0.2 mm; Printing, depositing or spraying a resistive heating layer or track-type heating element 32 onto the thin film 31b formed by tape casting; and wrapping the thin film 31b around the outside of the tubular jig in a tubular shape and sintering to form a substrate 31 / 31a with a tube wall thickness of less than 0.2 mm.

[0060] It should be noted that the specification and drawings of this application show preferred embodiments of the present application, but are not limited to the embodiments described in this specification, and that those skilled in the art may make improvements and modifications based on the above description, and all such improvements and modifications shall fall within the scope of protection of the appended claims of this application.

Claims

1. 1. An aerosol generating device arranged to heat an aerosol-generating product to generate an aerosol, comprising: a cavity for receiving an aerosol-generating product; an electrically insulating substrate that is tubular and configured to at least partially surround or define the cavity; a heating element coupled to the substrate and surrounding at least a portion of the substrate; the substrate and the heating element are thermally conductive with each other, and in use the substrate receives heat from the heating element and generates heat to heat the aerosol-generating product; The aerosol generating device, wherein the substrate comprises at least one of ceramic, glass, and quartz, and the tube wall thickness of the substrate is less than 0.2 mm.

2. 2. The aerosol generating device according to claim 1, wherein the substrate does not contain a metal element.

3. 3. The aerosol generating device according to claim 1, wherein the thickness of the wall of the substrate is 0.1 to 0.2 mm.

4. 3. The aerosol generating device according to claim 1, wherein the substrate is a tubular precursor having a thin wall formed by cylindrically grinding the tubular precursor with a cylindrical grinder.

5. 3. The aerosol generating device according to claim 1, wherein the substrate is tested according to a three-point bending strength test method, and the bending strength of all test points of the substrate is greater than 40 N.

6. 3. The aerosol generating device according to claim 1, wherein the heating element comprises a heating layer formed on or bonded to a substrate.

7. 7. The aerosol generating device according to claim 6, wherein the heating layer is configured in an annular shape surrounding the substrate.

8. the substrate includes first and second longitudinally spaced ends; a first electrode coupled to the substrate and positioned proximate the first end; a second electrode coupled to the substrate and positioned proximate the second end; 8. The aerosol generating device of claim 7, wherein the heating layer extends between the first electrode and the second electrode, and is configured to conduct a current longitudinally through the heating layer by the first electrode and the second electrode.

9. 3. The aerosol generating device according to claim 1, wherein the resistance of the heating layer is 0.5Ω to 3Ω when the first electrode and the second electrode conduct a current in the vertical direction of the heating layer.

10. 3. The aerosol generating device according to claim 1, wherein the substrate is heated from room temperature to 320° C. in 30 seconds when the heating element is supplied with a power of 30 W.

11. the substrate has an inner diameter of 5.4 to 7.8 mm; 3. An aerosol generating device according to claim 1 or 2, characterized in that the length of the aerosol-generating product surrounded or enclosed by the substrate is greater than 30 mm.

12. an electrically insulating substrate configured in a tubular shape; a heating element coupled to the substrate and surrounding at least a portion of the substrate; A heater for an aerosol generating device, characterized in that the substrate and the heating element are thermally conductive to each other, and during use, the substrate can generate heat by receiving heat from the heating element, the substrate includes at least one of ceramic, glass, and quartz, and has a tube wall thickness of less than 0.2 mm.

13. A quartz tube; an infrared emitting coating sprayed or deposited on the outer surface of the quartz tube, surrounding at least a portion of the quartz tube, and adapted to emit infrared rays into a tubular hollow portion of the quartz tube; A heater for an aerosol generating device, wherein the quartz tube has a wall thickness of less than 0.2 mm.

14. obtaining a tubular precursor comprising at least one of ceramic, glass, and quartz and having a tube wall thickness of greater than 0.2 mm; grinding the tubular precursor with a cylindrical grinder until the tube wall thickness is less than 0.2 mm to obtain an electrically insulating substrate; forming a heating element on the substrate.

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