EP4287877A1 - Ensemble de chauffage pour un dispositif de génération d'aérosol - Google Patents

Ensemble de chauffage pour un dispositif de génération d'aérosol

Info

Publication number
EP4287877A1
EP4287877A1 EP22700998.2A EP22700998A EP4287877A1 EP 4287877 A1 EP4287877 A1 EP 4287877A1 EP 22700998 A EP22700998 A EP 22700998A EP 4287877 A1 EP4287877 A1 EP 4287877A1
Authority
EP
European Patent Office
Prior art keywords
electrically insulating
coating
insulating material
heating
heating element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22700998.2A
Other languages
German (de)
English (en)
Inventor
Glenn Harrison
Alec WRIGHT
Dick Paul VOERMAN
Ernst Hupkes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JT International SA
Original Assignee
JT International SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JT International SA filed Critical JT International SA
Publication of EP4287877A1 publication Critical patent/EP4287877A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F40/46—Shape or structure of electric heating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/46—Heating elements having the shape of rods or tubes non-flexible heating conductor mounted on insulating base
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/20—Devices using solid inhalable precursors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/003—Heaters using a particular layout for the resistive material or resistive elements using serpentine layout

Definitions

  • the present invention relates to a heating assembly for an aerosol generating device and a method of manufacturing a heating assembly for an aerosol generating device.
  • the disclosure is particularly applicable to a portable aerosol generation device, which may be self-contained and low temperature. Such devices may heat, rather than burn, tobacco or other suitable aerosol substrate materials by conduction, convection, and/or radiation, to generate an aerosol for inhalation.
  • reduced-risk or modified-risk devices also known as vaporisers
  • vaporisers have grown rapidly in the past few years as an aid to assist habitual smokers wishing to quit using traditional tobacco products such as cigarettes, cigars, cigarillos, and rolling tobacco.
  • Various devices and systems are available that heat or warm aerosolisable substances as opposed to burning tobacco in conventional tobacco products.
  • electrically insulating film such as PEEK or polyimide is generally provided between the heating element and the heating chamber.
  • PEEK polyimide
  • the present invention eliminates the need for such a film, whilst also improving the heat transfer properties and thereby improving the efficacy of the heating assembly.
  • using a coating rather than a separate electrically insulating film greatly simplifies the manufacturing process.
  • the coating of electrically insulating material is formed using one of: vapour deposition; painting; dipping; or spraying.
  • the coating of electrically insulating material exhibits advantageous mechanical and electrical properties compared to a film of electrically insulating material which is pre-formed (e.g. a polyimide film) and then attached to the outer surface of the heating chamber.
  • the coating of electrically insulating material conforms to specific morphology of the outer surface of the heating chamber, in contrast to a pre-formed film which does not form as closely to the surface, leading to suboptimal heat transfer.
  • the coating of electrically insulating material comprises: ceramic and glass; ceramic and silicone; or glass and silicone. More preferably, the coating of electrically insulating material comprises ceramic; glass; and silicone.
  • the coating of electrically insulating material provides significantly improved thermal conductivity compared to using a typical electrically insulating film comprising polyether ether ketone (PEEK) or polyimide.
  • PEEK polyether ether ketone
  • the inclusion of glass and ceramic within silicone provides high temperature resistance (e.g. a temperature rating of 482°C) and high thermal conductivity whilst being able to be formed as a thin coating.
  • the heating element may be supported on a carrier film, and the heating element may be wrapped around the coating of electrically insulating material using the carrier film. Once the heating element has been positioned, the carrier film may be removed and the flexible electrically insulating film may subsequently be wrapped around the heating chamber.
  • the heating assembly further comprises: a thin film heater comprising the heating element and a flexible backing film on which the heating element is supported, wherein the thin film heater is wrapped around the heating chamber with the heating element against the coating of electrically insulating material.
  • the heating element comprises a resistive metal track.
  • the coating of electrically insulating material has a dielectric breakdown strength of at least 500 V/mm, and more preferably at least 1000 V/mm.
  • a method of manufacturing a heating assembly comprising: applying the coating of electrically insulating material to the outer surface of the heating chamber using one of: vapour deposition; painting; dip coating; or spraying.
  • the method further comprises: curing the coating of electrically insulating material at a temperature of at least 80°C.
  • the coating of electrically insulating material comprising ceramic, glass, and silicone may be thermally cured after it has been applied to the outer surface of the heating chamber.
  • the coating of electrically insulating material may be cured for 15 minutes at 95°C, then 15 minutes at 250°C, and then 10 minutes at 540°C.
  • the method further comprises: supporting the heating element on a carrier film; wrapping the heating element around the heating chamber using the carrier film such that the heating element is disposed against the coating of electrically insulating material; removing the carrier film; and wrapping a flexible electrically insulating film around the heating chamber such that the heating element is disposed between the flexible electrically insulating film and the coating of electrically insulating material.
  • the method further comprises: supporting the heating element on a flexible electrically insulating film; wrapping the flexible electrically insulating film around the heating chamber such that the heating element is disposed against the coating of electrically insulating material.
  • the method further comprises: heating the flexible electrically insulating film which is a heat shrink film, such that the heating element is secured to the coating of electrically insulating material.
  • an aerosol generating device comprising a heating assembly according to the first aspect.
  • Figure 1 is an exemplary aerosol generating device according to an embodiment of the invention
  • Figure 2 is a perspective view of a heating assembly according to an embodiment of the invention.
  • Figure 3 is a schematic cross sectional view of the heating assembly of Figure 2 further comprising a flexible electrically insulating film;
  • Figure 4 is a flow diagram showing method steps for manufacturing the heating assembly according to an embodiment of the invention.
  • Figure 5 is perspective view of the heating assembly of Figure 2 showing the application of the heating element using a carrier film.
  • FIG. 1 illustrates an aerosol generating device 100 according to an embodiment of the invention.
  • the aerosol generating device 100 is illustrated in an assembled configuration with the internal components visible.
  • the aerosol generating device 100 is a heat-not-burn device, which may also be referred to as a tobacco-vapour device, and comprises a heating assembly 200 configured to receive an aerosol substrate such as a rod of aerosol generating material, e.g. tobacco.
  • the heating assembly 200 is operable to heat, but not burn, the rod of aerosol generating material to produce a vapour or aerosol for inhalation by a user.
  • the aerosol generating device 100 depicted in Figure 1 is simply an exemplary aerosol generating device according to the invention.
  • Other types and configurations of tobacco-vapour products, vaporisers, or electronic cigarettes may also be used as the aerosol generating device according to the invention.
  • FIG. 2 shows a perspective view of a heating assembly 200 according to an embodiment of the invention.
  • Figure 3 shows a cross-sectional schematic view of the heating assembly 200, except the heating assembly 200 further comprises a flexible electrically insulating film 210 wrapped around the heating assembly 200.
  • the heating assembly 200 comprises a heating chamber 202, also referred to as a thermally conductive shell, configured to hold an aerosol substrate, also referred to as a consumable, therein.
  • the heating chamber 202 defines a cylindrical cavity in which a rod of aerosol substrate may be positioned.
  • the heating chamber 202 is tubular, e.g. cylindrical, and has an opening 204 positioned at a longitudinal end of the heating chamber 202.
  • the user may insert the aerosol substrate through the opening 204 in the heating chamber 202 such that the aerosol substrate is positioned within the heating chamber 202 and interfaces with an inner surface 201 of the heating chamber 202.
  • the length of the heating chamber 202 may be configured such that a portion of the aerosol substrate protrudes through the opening 204 in the heating chamber 202, i.e. out of the heating assembly 200, and can be received in the mouth of the user.
  • the heating chamber 202 comprises, and preferably consists of, metal such that an efficient transfer of heat is provided through a side wall of the heating chamber 202 to the aerosol substrate, whilst also ensuring that the heating chamber 202 has sufficient structural stability and durability.
  • suitable metals include steel or stainless steel.
  • the heating chamber 202 may comprise a plurality of elongate ridges protruding inwardly as shown in Figure 5.
  • the elongate ridges may be produced by pressing into the outer surface of a tubular member as fluid is injected under pressure into the tubular member to provide a plurality of corresponding elongate protrusions running lengthwise on the inner surface of the tubular member.
  • the coating of electrically insulating material 206 comprises at least one of ceramic, glass, silicone, and carbon, or any combination thereof.
  • the coating of electrically insulating material 206 comprises (and optionally consists of) silicone, glass and ceramic.
  • This combination of constituents provides a high electric breakdown voltage, e.g. between 100 and 1000 V/mm, and exhibits high thermal conductivity in comparison to, for example, polyimide which is used within typical electrically insulating films.
  • a thin coating e.g. 10 pm, may be used which provides improved heat transfer to the aerosol substrate received within the heating chamber 202.
  • polyimide has a thickness of around 25 microns.
  • Such properties advantageously reduce the heat-up time and cool-down time of the heating chamber 202, and improve the energy efficiency of the heating assembly 200.
  • coating materials may also have a higher thermal stability than polyimide.
  • silicone glass is stable up to approximately 482°C, DLC up to 300°C, silicone modified alkyd up to 450°C, whereas polyimide is only stable up to 270°C.
  • the coating of electrically insulating material 206 may comprise (and optionally consists of) diamond-like-carbon (DLC) or silicone modified alkyd resin.
  • a heating element 208 comprising one or more heater tracks surrounds the coating of electrically insulating material 206.
  • the heating element 208 is wrapped around the heating chamber 202, e.g. in a circumferential direction, such that the heating element 208 lies adjacent to (i.e. abuts, contacts) the coating of electrically insulating material 206.
  • the coating of electrically insulating material 206 acts as a barrier to separate the heating element 208 and the heating chamber 202 such that contact between the heating element 208 and the heating chamber 202 is prevented.
  • the heating element 208 may only partially surround the heating chamber 202 and/or one or more heating elements 208 may be arranged around the circumference of the heating chamber 202.
  • the heating element 208 comprises a heating material suitable for converting electrical energy into heat (such as stainless steel, titanium, nickel, Nichrome, nickel based alloy, silver etc.).
  • the heating element 208 comprises one or more resistive heater tracks.
  • the heating element 208 may be formed in alternative configurations, e.g. as a heating sheet.
  • power may be supplied to the heating element 208 from a power source such as a battery (not depicted) such that the temperature of the heating element 208 increases and heat energy is transferred across the coating of electrically insulating material 206 to the heating chamber 202.
  • a power source such as a battery (not depicted)
  • the aerosol substrate received within the heating chamber 202 is conductively heated by the heating chamber 202 to produce an aerosol for inhalation by the user.
  • the heating chamber 202 is not a resistive heater, and therefore should not receive a current.
  • the coating of electrically insulating material 206 advantageously prevents a short circuit occurring between the heating element 208 and the heating chamber 202, whilst allowing an efficient transfer of heat from the heating element 208 to the heating chamber 202. That is, the coating of electrically insulating material 206 separates the heating element 208 and the heating chamber 202 and ensures that a current does not flow from the heating element 208 to the heating chamber 202. This eliminates the need for an additional layer of polyimide or PEEK, which is often wrapped between the heating chamber 202 and heating element 208 in conventional aerosol generating devices.
  • the electrically insulating film 210 may be a heat shrink film, such that the heating element 208 is secured against the coating of electrically insulating material 206.
  • the electrically insulating film 210 which surrounds the exterior of the heating assembly 200, consolidates the heating assembly 200 and ensures that the heating element 208 maintains contact with the coating of electrically insulating material 206.
  • the heating element 208 may be secured to the coating of electrically insulating material 206 using an adhesive.
  • the electrically insulating film 210 is illustrated as entirely enveloping the heating element 208 and the coating of electrically insulating material 206. That is, the electrically insulating film 210 extends beyond the extent of the heating element 208 and up to the longitudinal edges of the coating of electrically insulating material. However, it will be appreciated that the size and placement of the electrically insulating film 210 may vary.
  • Figure 4 illustrates a flow chart which is a method 300 of manufacturing a heating chamber according to an embodiment of the invention.
  • the coating of electrically insulating material 206 is cured in one or more curing stages, preferably at a temperature of above 80°C.
  • the coating of electrically insulating material may be cured for 15 minutes at 95°C, then 15 minutes at 250°C, and finally 10 minutes at 250°C.
  • This particular curing process is particularly applicable to the layer electrically insulating material 206 comprising silicone, and preferably silicone, glass, and ceramic.
  • curing also known as thermal curing or heat curing, refers to a method of hardening or toughening polymers such as silicone by facilitating the cross-linking of polymer chains.
  • the heating element 208 may be wrapped around the heating chamber 202 using a carrier film 212, as illustrated in Figure 5. That is, the heating element 208 is supported on a surface of the carrier film 212 and the method 300 further comprises wrapping the carrier film 212 around the heating chamber 202 in a circumferential direction such that the heating element 208 lies against the coating of electrically insulating material 206. Once the heating element 208 is correctly positioned, the carrier film 212 may be removed.
  • the heating element 208 may be comprised within a thin film heater, wherein the thin film heater comprises the heating element 208 and a flexible backing film on which the heating element 208 is supported.
  • the method 300 comprises wrapping the thin film heater around the heating chamber 202 with the heating element 208 against the coating of electrically insulating material 206.
  • a flexible electrically insulating film 210 is wrapped around the heating chamber 202.
  • the flexible electrically insulating film 210 envelops the heating element 208 such that the heating element 208 is interposed between the flexible electrically insulating film 210 and the coating of electrically insulating material 206.
  • the heating element 208 may be supported on the flexible electrically insulating film 210 prior to being attached to the coating of electrically insulating material 206.
  • the heating element 206 is wrapped around the heating chamber 202 using the flexible electrically insulating film 210, i.e. steps 308 and 310 occur concurrently.
  • the flexible electrically insulating film 210 may be a heat shrink film.
  • the method 300 further comprises applying heat to the flexible electrically insulating film 210 such that the flexible electrically insulating film 210 contracts around the heating element 208 and the heating element 208 is secured against the coating of electrically insulating material 206.

Abstract

Est ici divulgué un ensemble de chauffage (200) pour un dispositif de génération d'aérosol (100). L'ensemble de chauffage (200) comprend une chambre de chauffage tubulaire métallique (202) comprenant une ouverture (204) pour recevoir un substrat d'aérosol. Un revêtement de matériau électriquement isolant (206) entoure au moins partiellement une surface externe (203) de la chambre de chauffage (202), le revêtement de matériau électriquement isolant (206) comprenant un ou plusieurs éléments parmi : de la céramique ; du verre ; de la silicone ; et du carbone. Un élément chauffant (208) entoure au moins partiellement la chambre de chauffage et est disposé contre le revêtement de matériau électriquement isolant (206), le revêtement de matériau électriquement isolant (206) empêchant tout contact entre l'élément (208) et la chambre de chauffage (202).
EP22700998.2A 2021-02-08 2022-01-25 Ensemble de chauffage pour un dispositif de génération d'aérosol Pending EP4287877A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21155872 2021-02-08
PCT/EP2022/051545 WO2022167260A1 (fr) 2021-02-08 2022-01-25 Ensemble de chauffage pour un dispositif de génération d'aérosol

Publications (1)

Publication Number Publication Date
EP4287877A1 true EP4287877A1 (fr) 2023-12-13

Family

ID=74561837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22700998.2A Pending EP4287877A1 (fr) 2021-02-08 2022-01-25 Ensemble de chauffage pour un dispositif de génération d'aérosol

Country Status (4)

Country Link
EP (1) EP4287877A1 (fr)
JP (1) JP2024506517A (fr)
TW (1) TW202231199A (fr)
WO (1) WO2022167260A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101989855B1 (ko) * 2017-04-18 2019-06-17 주식회사 아모센스 궐련형 전자담배장치용 발열히터
CN110742321B (zh) * 2018-07-21 2023-10-20 湖南中烟工业有限责任公司 并列式分段发热结构及其应用的低温烟具
KR102211820B1 (ko) * 2019-01-15 2021-02-03 (주)아이피아이테크 열전달 효율이 우수한 궐련형 전자담배용 히터 및 그 제조 방법

Also Published As

Publication number Publication date
JP2024506517A (ja) 2024-02-14
TW202231199A (zh) 2022-08-16
WO2022167260A1 (fr) 2022-08-11

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