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`EXHIBIT 5
`EXHIBIT 5
`
`

`

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`
`a2) United States Patent
`US 10,104,911 B2
`(10) Patent No.:
`
` Thorenset al. (45) Date of Patent: Oct. 23, 2018
`
`
`(54) AEROSOL GENERATING SYSTEM WITH
`PREVENTION OF CONDENSATE LEAKAGE
`
`(75)
`
`Inventors: Michel Thorens, Moudon (CH);
`Jean-Mare Flick, Pomy (CH); Olivier
`Yves Cochand, Dombresson (CH);
`Flavien Dubief, Neuchatel (CH)
`
`(58) Field of Classification Search
`CPC wee. A61M 16/108; A61M 16/202; A61M
`11/041; A61M 15/06; A61M 16/0808:
`(Continued)
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`(73) Assignee: Philip Morris Products S.A.,
`Neuchatel (CH)
`
`(*) Notice:
`
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 582 days.
`
`4,275,747 A *
`
`4,419,302 A
`
`6/1981 Miller oo. A24F 1/08
`131/195
`
`12/1983 Nishinoetal.
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`(21) Appl. No.:
`
`13/990,067
`
`(22) PCT Filed:
`
`Dec. 2, 2011
`
`(86) PCT No.:
`
`PCT/EP2011/006055
`
`§ 371 (€)Q),
`(2), (4) Date: Aug. 9, 2013
`
`(87) PCT Pub. No.: WO2012/072264
`
`PCT Pub. Date: Jun. 7, 2012
`
`(65)
`
`Prior Publication Data
`
`US 2013/0306064 Al
`
`Nov. 21, 2013
`
`(30)
`
`Foreign Application Priority Data
`
`Dec. 3, 2010
`
`(EP) wee cee enereeeee 10252048
`
`(51)
`
`Int. Cl.
`A24F 47/00
`A61M 15/06
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S, CL
`CPC we A24F 47/008 (2013.01); A61M 11/042
`(2014.02); A61M 15/06 (2013.01);
`(Continued)
`
`CA
`CN
`
`2 641 869 Al
`87 1 05919 A
`
`5/2010
`9/1988
`
`(Continued)
`
`OTHER PUBLICATIONS
`
`International Search Report and Written Opinion dated Mar. 8, 2012
`in International Application No. PCT/EP2011/006055.
`(Continued)
`
`Primary Examiner — Gregory Anderson
`Assistant Examiner — Elliot S Ruddie
`
`(74) Attorney, Agent, or Firm — Oblon, McClelland,
`Maier & Neustadt, L.L.P.
`
`(57)
`
`ABSTRACT
`
`There is provided an aerosol generating system for heating
`a liquid aerosol-forming substrate. The system includes an
`aerosol-forming chamber, and a leakage preventer for pre-
`venting or reducing leakage of liquid aerosol condensate
`from the aerosol generating system. The leakage preventer
`may include one or moreof: at least one cavity in a wall of
`the aerosol-forming chamber,
`for collecting droplets of
`condensed liquid aerosol-forming substrate; at
`least one
`hooked memberfor collecting droplets of condensed liquid
`aerosol-forming substrate; an impactor for disrupting air-
`flow in the aerosol-forming chambersoasto collect liquid
`droplets; and a closure memberfor substantially sealing the
`(Continued)
`
`
`
`DEF_PUB_EDVA000025700
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`PX-003
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`

`

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`US 10,104,911 B2
`Page 2
`
`aerosol-forming chamber when the aerosol generating sys-
`tem is not in use.
`
`7,832,410 B2
`2009/0272379 AL
`2010/0200008 Al
`
`11/2010 Hon
`11/2009 Thorensetal.
`8/2010 Taieb
`
`13 Claims, 3 Drawing Sheets
`
`FOREIGN PATENT DOCUMENTS
`
`(51)
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. Cl.
`AGIM 16/10
`AGIM 16/20
`AGIM 11/04
`AGIM 16/08
`A61M 16/00
`(52) U.S. Cl.
`CPC esc AG6IM 16/108 (2014.02); A6IM 16/202
`(2014.02); A6IM 16/0808 (2013.01); A6IM
`2016/0024 (2013.01); A6IM 2205/3646
`(2013.01)
`
`(58) Field of Classification Search
`CPC .. A61M 2016/0024; A61M 2205/3646; A24B
`15/165; A24B 15/18; A24F 47/008; A24F
`47/002
`.... 131/194, 198.2, 270, 273, 290, 329, 330,
`131/360; 128/202.21
`See application file for complete search history.
`
`USPC.
`
`(56)
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`
`
`4,846,199 A
`5,935,975 A *
`
`7/1989 Rose
`8/1999 ROS veces A24B 15/16
`424/449
`
`CN
`CN
`CN
`EA
`FR
`JP
`JP
`JP
`WO
`WO
`
`201079011 Y
`201104488 Y
`201479921 U
`200802045 Al
`2128256
`2000-5 10763
`2007-532118 A
`2009-526540
`WO 2007/131449 Al
`2009 132793
`
`7/2008
`8/2008
`5/2010
`2/2009
`10/1972
`8/2000
`11/2007
`7/2009
`11/2007
`11/2009
`
`OTHER PUBLICATIONS
`
`Office Action dated Aug. 13, 2014 in Colombian Patent Application
`No. 13-156667-3 (with English language translation).
`Combined Chinese Office Action and Search Report dated Nov. 4,
`2014 in Patent Application No. 201180058140.9 (with English
`Translation).
`Combined Chinese Office Action and Search Report dated Jan. 4,
`2016 in Patent Application No. 201180058140.9 (with English
`Translation).
`Office Action dated Mar. 18, 2016 in Eurasian Patent Application
`No. 201390819 (with English language translation).
`Office Action dated Aug. 31, 2015 in Japanese Patent Application
`No. 2013-541250 (with English language translation).
`Office Action dated Sep. 10, 2015 in Eurasian Patent Application
`No. 201390819/31 (with English languagetranslation).
`Korean Office Action with English translation dated Feb. 9, 2018 in
`corresponding Korean Patent Application No. 10-2013-7013271,
`citing documents AA, AO, and APtherein (13 pages).
`
`* cited by examiner
`
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`U.S. Patent
`
`Oct. 23, 2018
`
`Sheet 1 of 3
`
`US 10,104,911 B2
`
`NR
`N_o
`
`w~125
`
`105
`
`Figure1
`
`100
`
`DEF_PUB_EDVA000025702
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`

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`U.S. Patent
`
`Oct. 23, 2018
`
`Sheet 2 of 3
`
`US 10,104,911 B2
`
`
`
`Figure 3
`
`Figure 4
`
`Figure 5
`
`Figure 6
`
`DEF_PUB_EDVA000025703
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`

`

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`U.S. Patent
`
`Oct. 23, 2018
`
`Sheet 3 of 3
`
`US 10,104,911 B2
`
`103
`
`704
`
`447
`
`705b
`
`103
`
`801
`
`427
`427
`905
`
`103
`
`901
`
`+117
`
`907
`
`413
`
`419 1278 905a
`
`ggg
`
`Figure 9
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`DEF_PUB_EDVA000025704
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`

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`US 10,104,911 B2
`
`1
`AEROSOL GENERATING SYSTEM WITH
`PREVENTION OF CONDENSATE LEAKAGE
`
`CROSS REFERENCE TO RELATED
`APPLICATION
`
`This application is a national phase application based on
`PCT/EP2011/006055, filed Dec. 2, 2011.
`The present invention relates to an aerosol generating
`system. In particular,
`the present invention relates to an
`aerosol generating system in which the aerosol-forming
`substrate is liquid.
`an electrically heated
`WO-A-2009/132793 discloses
`smoking system. A liquid is stored in a liquid storage
`portion, and a capillary wick has a first end which extends
`into the liquid storage portion for contact with the liquid
`therein, and a second end which extends out of the liquid
`storage portion. A heating element heats the second end of
`the capillary wick. The heating element is in the form of a
`spirally wound electric heating element in electrical con-
`nection with a power supply, and surrounding the second
`end ofthe capillary wick. In use, the heating element may be
`activated by the user to switch on the power supply. Suction
`on a mouthpiece by the user causes air to be drawninto the
`electrically heated smoking system over the capillary wick
`and heating element and subsequently into the mouth of the
`user.
`
`The aerosol generating systemsof the prior art, including
`the electrically operated smoking system referred to above,
`do have a numberof advantages, but there is still opportu-
`nity for improvementin the design.
`there is
`According to a first aspect of the invention,
`provided an aerosol generating system for heating a liquid
`aerosol-forming substrate, the system comprising: an aero-
`sol-forming chamber; and leakage prevention means con-
`figured to prevent or reduce leakage of liquid aerosol
`condensate from the aerosol generating system.
`The aerosol generating system is arranged to vaporize the
`liquid aerosol-forming substrate to form a vapour, which
`condenses in the aerosol-forming chamber to form the
`aerosol. Thus, the aerosol-forming chambersimply assists or
`facilitates the generation of the aerosol. The aerosol gener-
`ating, system may include the aerosol-forming substrate or
`maybe adapted to reccive the acrosol-forming substrate. As
`knownto those skilled in the art, an aerosol is a suspension
`of solid particles or liquid droplets in a gas, such as air.
`An advantage of the invention is that leakage of liquid
`aerosol condensate from the aerosol generating system is
`prevented or at least substantially reduced. The condensed
`liquid (liquid condensate) may form due to a change in
`temperature, for example a sudden temperature drop. Alter-
`natively or additionally, the liquid condensate may accumu-
`late in cavities, grooves, corners or other portions of the
`aerosol generating system where there is reduced airflow.
`The rate of condensation is affected by the vapour pressure
`of the aerosol-forming substrate, the temperature gradient
`between the vapour and the housing or wall of the aerosol
`generating system,and other factors, for example the airflow
`and turbulence. Minimising, or preferably preventing, leak-
`age of the liquid aerosol condensate is important to avoid
`wastage of the liquid aerosol-forming substrate. In addition,
`if liquid leaks out of the aerosol generating system, this may
`cause inconvenience for the user. For example, the aerosol
`generaling system may becomewelorsticky.
`The liquid aerosol-forming substrate preferably has
`physical properties, for example boiling point and vapour
`pressure, suitable for use in the aerosol generating system.If
`
`me 0
`
`a 5
`
`30
`
`35
`
`40
`
`45
`
`50
`
`65
`
`2
`it may not be possible to
`the boiling point is too high,
`vaporize the liquid but, if the boiling point is too low, the
`liquid may vaporize too readily. The liquid preferably com-
`prises a tobacco-containing material comprising volatile
`tobacco flavour compounds which are released from the
`liquid upon heating. Alternatively, or in addition, the liquid
`may comprise a non-tobacco material. The liquid may
`include water, solvents, ethanol, plant extracts, nicotine
`solutions and natural or artificial flavours. Preferably, the
`liquid further comprises an aerosol former. Examples of
`suitable aerosol formers are glycerine and propylene glycol.
`In a first embodiment of the invention, the leakage pre-
`vention means comprises at least one cavity in a wall of the
`aerosol-forming chamber, for collecting liquid condensate
`formed from the aerosol-forming substrate.
`Providing at least one cavity in a wall of the aerosol-
`forming chamberallows condensed droplets of the liquid to
`be collected. Preferably, the at least one cavity interrupts the
`flow route for droplets of condensed liquid which may
`otherwise leak out of the aerosol generating system. Thus,
`leakage of condensed liquid from the aerosol generating
`system is prevented or at least reduced. The at least one
`cavity may have any suitable size and shape and may be
`located at any suitable location in the aerosol-forming
`chamber. Preferably, the at least one cavity is close to an
`outlet end of the aerosol generating system. If the aerosol
`generating system includes a liquid storage portion or a
`capillary wick or both a liquid storage portion and a capillary
`wick, the at least one cavity may comprise a return path for
`returning condensed liquid droplets to the liquid storage
`portion or capillary wick.
`In the first embodiment of the invention, the at least one
`cavity may contain capillary material. Providing capillary
`material in the at least one cavity minimisesthe free liquid.
`This reduces the likelihood that condensed liquid will leak
`from the aerosol generating system. The capillary material
`may comprise any suitable material or combination of
`materials which is able to retain the collected liquid. The
`particular preferred material or materials will depend on the
`physical properties of the liquid aerosol-forming substrate.
`Examples of suitable materials are a sponge or foam mate-
`rial, ceramic- or graphite-based materials in the form of
`fibres or sintered powders, a foamed metal or plastics
`material, a fibrous material, for cxample made of spinned or
`extruded fibres, such as cellulose acetate, polyester, or
`bonded polyolefin, polyethylene, terylene or polypropylene
`fibres, nylon fibres or ceramic. Mostpreferably, the capillary
`material substantially fills the cavities so as to minimise the
`free liquid.
`If the aerosol generating system includes a liquid storage
`portion or a capillary wick or both a liquid storage portion
`and a capillary wick, the capillary material may provide a
`return path for returning condensed liquid droplets to the
`liquid storage portion or capillary wick. The capillary mate-
`rial may be in contact with the capillary wick. The capillary
`material in the at least one cavity and the capillary wick may
`comprise the same material or different materials.
`In a second embodiment of the invention, the leakage
`prevention means comprisesat least one hooked memberfor
`collecting droplets of liquid condensate formed from the
`aerosol-forming, substrate.
`Providing a hooked memberallows condensed droplets of
`the liquid aerosol-forming substrate to be collected. Prefer-
`ably, the at least one hooked member interrupts the flow
`route for droplets of condensed liquid. Thus,
`leakage of
`liquid condensate from the aerosol generating system is
`prevented. The at least one hooked member may have any
`
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`US 10,104,911 B2
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`3
`suitable size and shape and maybelocated at any suitable
`location. For example, the hooked member may be posi-
`tioned on a wall of the aerosol-forming chamber.
`In the second embodiment of the invention, the at least
`one hooked member may comprise a recycle path for
`recycling the collected droplets ofthe liquid condensate. The
`recycle path may comprise an angled portion of the hooked
`member. If the aerosol generating system includes a liquid
`storage portion or a capillary wick or both a liquid storage
`portion and a capillary wick, the recycle path may return
`condensed liquid droplets to the liquid storage portion or
`capillary wick. The trapping andtransportation of conden-
`sate droplets can be enhanced by surface properties (for
`example, but not limited to, surface profile, surface rough-
`ness) or material (for example, but not limited to, use of a
`hydrophobic or hydrophilic material) of an inner wall of the
`aerosol generating system, for example the inner wall of the
`aerosol-forming chamber.
`In the second embodiment of the invention, the at least
`one hooked member includes capillary material. The capil-
`lary material may be provided on part orall of the collecting
`surface of the hooked member. Providing capillary material
`on theat least one hooked member minimisesthe free liquid.
`This reduces the likelihood that condensed liquid will leak
`from the aerosol generating system. The capillary material
`may comprise any suitable material or combination of
`materials which is able to retain the collected liquid. The
`particular preferred material or materials will depend on the
`physical properties of the liquid aerosol-forming substrate.
`Examples of suitable materials are a sponge or foam mate-
`rial, ceramic- or graphite-based materials in the form of
`fibres or sintered powders, a foamed metal or plastics
`material, a fibrous material, for example made of spinned or
`extruded fibres, such as cellulose acetate, polyester, or
`bonded polyolefin, polyethylene, terylene or polypropylene
`fibres, nylon fibres or ceramic.
`If the hooked memberincludesa recycle path, preferably,
`the recycle path includes the capillary material. This
`improves recycling of the condensed liquid droplets. If the
`aerosol generating system includes a liquid storage portion
`or a capillary wick or both a liquid storage portion and a
`capillary wick, the capillary material may return condensed
`iquid dropletsto the liquid storage portion or capillary wick.
`The capillary material may be in contact with the capillary
`wick. The capillary material on the at least one hooked
`member and the capillary wick may comprise the same
`material or different materials.
`the leakage
`In a third embodiment of the invention,
`prevention means comprises an impactor for disrupting
`airflow in the aerosol-forming chamber so as to collect
`droplets of liquid being formed from the aerosol-forming
`substrate.
`Providing an impactor which disrupts the airflow allows
`droplets of the liquid aerosol-forming substrate to be col-
`lected. This is because, as the airflow is disrupted, some
`liquid droplets cannotbecarried in the airflow and impact on
`the impactorinstead. The collected liquid droplets tend to be
`the larger liquid droplets. The collected liquid droplets
`cannot
`leak out of the aerosol generating system. Thus,
`leakage of liquid condensate from the aerosol generating
`system is prevented. The impactor may have any suitable
`size and shape and may belocated at any point downstream
`of the vapour formation.
`the impactor
`In the third embodiment of the invention,
`may include capillary material. The capillary material is
`preferably provided on part or all of the upstream surface of
`the impactor. The capillary material may be provided on
`
`
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`4
`other surfaces of the impactor. Providing capillary material
`on the collecting surface of the impactor minimisesthe free
`liquid. This reduces the likelihood that liquid condensate
`will leak from the aerosol generating system. The capillary
`material may comprise any suitable material or combination
`of materials which is able to retain the collected liquid. The
`particular preferred material or materials will depend on the
`physical properties of the liquid aerosol-forming substrate.
`Examples of suitable materials are a sponge or foam mate-
`rial, ceramic- or graphite-based materials in the form of
`fibres or sintered powders, a foamed metal or plastics
`material, a fibrous material, for example made of spinned or
`extruded fibres, such as cellulose acetate, polyester, or
`bonded polyolefin, polyethylene, terylene or polypropylene
`fibres, nylon fibres or ceramic.
`If the aerosol generating system includes a liquid storage
`portion or a capillary wick or both a liquid storage portion
`and a capillary wick, the capillary material on the impactor
`may return liquid droplets to the liquid storage portion or
`capillary wick. The capillary material on the impactor may
`be in contact with the capillary wick. The capillary material
`on the impactor and the capillary wick may comprise the
`same material or different materials.
`In a fourth embodiment of the invention, the leakage
`prevention means comprises a closure member for substan-
`tially sealing the aerosol-forming chamber whenthe aerosol
`generating system is not in use.
`Providing, a closure member which substantially seals the
`aerosol-forming chamber when the aerosol generating sys-
`tem is not in use substantially prevents any condensedliquid
`droplets from leaking out of the aerosol generating system
`whenit is not in use. It should be understood that the closure
`
`member need only substantially seal the exit of the aerosol-
`forming chamber. The inlet of the aerosol-forming chamber
`may remain open, even when the closure memberis in the
`closed position.
`The closure member may have any suitable size and
`shape. The closure member may be manually operable by a
`user. Alternatively, the closure member maybeelectrically
`operable, either on user instruction or automatically.
`The closure member mayinclude capillary material. The
`capillary material may be provided on part or all of the
`upstream surface of the closure member. The capillary
`material will retain any liquid which collects on the closure
`member. This reduces the likelihood that condensed liquid
`will leak from the aerosol generating system. The capillary
`material may comprise any suitable material or combination
`of materials whichis able to retain the collected liquid. The
`particular preferred material or materials will depend on the
`physical properties of the liquid aerosol-forming, substrate.
`Examples of suitable materials are a sponge or foam mate-
`rial, ceramic- or graphite-based materials in the form of
`fibres or sintered powders, a foamed metal or plastics
`material, a fibrous material, for example made of spinned or
`extruded fibres, such as cellulose acetate, polyester, or
`bonded polyolefin, polyethylene, terylene or polypropylene
`fibres, nylon fibres or ceramic.
`If the aerosol generating system includes a liquid storage
`portion or a capillary wick or both a liquid storage portion
`and a capillary wick, the capillary material on the closure
`member may return liquid droplets to the liquid storage
`portion or capillary wick. The capillary material on the
`closure member may be in contact with the capillary wick
`when the aerosol generating system is not in use. The
`capillary material on the closure member and the capillary
`wick may comprise the same materialor different materials.
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`US 10,104,911 B2
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`5
`The aerosol generating system may further comprise a
`liquid storage portion for storing the liquid aerosol-forming
`substrate.
`An advantage of providing a liquid storage portion is that
`the liquid in the liquid storage portion is protected from
`ambient air (because air cannot generally enter the liquid
`storage portion) and, in some embodiments light, so that the
`risk of degradation of the liquid is significantly reduced.
`Moreover, a high level of hygiene can be maintained. The
`liquid storage portion may not berefillable. Thus, when the
`liquid in the liquid storage portion has been used up, the
`aerosol generating system is replaced. Alternatively,
`the
`liquid storage portion may berefillable. In that case, the
`aerosol generating system may be replaced after a certain
`numberofrefills of the liquid storage portion. Preferably, the
`liquid storage portion is arranged to hold liquid for a
`pre-determined number of puffs.
`The aerosol generating system may further comprise a
`capillary wick for conveying the liquid aerosol-forming
`substrate by capillary action.
`Preferably, the capillary wick is arranged to be in contact
`with liquid in the liquid storage portion. Preferably,
`the
`capillary wick extends into the liquid storage portion. In that
`case, in use, liquid is transferred from the liquid storage
`portion by capillary action in the capillary wick. In one
`embodiment,
`liquid in one end of the capillary wick is
`vaporized to form a supersaturated vapour. The supersatu-
`rated vapour is mixed with and carried in the air flow. During
`the flow, the vapour condenses to form the aerosol and the
`aerosol is carried towards the mouth of a user. The liquid
`aerosol-forming substrate has physical properties, including
`surface tension and viscosity, which allow the liquid to be
`transported through the capillary wick by capillary action.
`The capillary wick may have a fibrous or spongy struc-
`ture. The capillary wick preferably comprises a bundle of
`capillaries. For example, the capillary wick may comprise a
`plurality of fibres or threads or other fine bore tubes. The
`fibres or threads may be generally alignedin the longitudinal
`direction of the aerosol generating system. Alternatively, the
`capillary wick may comprise sponge-like or foam-like mate-
`rial formed into a rod shape. The rod shape may extend
`along the longitudinal direction of the aerosol generating
`system. The structure of the wick formsa plurality of small
`bores or tubes, through which the liquid can be transported
`by capillary action. The capillary wick may comprise any
`suitable material or combination of materials. Examples of
`suitable materials are capillary materials, for example a
`sponge or foam material, ceramic- or graphite-based mate-
`rials in the form offibres or sintered powders, foamed metal
`or plastics material, a fibrous material, for example made of
`spinned or extruded fibres, such as cellulose acetate, poly-
`ester, or bonded polyolefin, polyethylene, terylene or poly-
`propylene fibres, nylon fibres or ceramic. The capillary wick
`may have any suitable capillarity and porosity so as to be
`used with different liquid physical properties. The liquid has
`physical properties, including but not limited to viscosity,
`surface tension, density, thermal conductivity, boiling point
`and vapour pressure, which allow the liquid to be trans-
`ported through the capillary device by capillary action.
`The aerosol generating system may beelectrically oper-
`ated. The electrically operated aerosol generating system
`may further comprise an electric heater for heating the liquid
`aerosol-forming substrate.
`The electric heater may comprise a single heating ele-
`ment. Alternatively, the electric heater may comprise more
`than one heating element for example two, orthree, or four,
`orfive, or six or more heating elements. The heating element
`
`20
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`25
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`30
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`35
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`6
`or heating elements may be arranged appropriately so as to
`most effectively heat the aerosol-forming substrate.
`Theat least one electric heating element preferably com-
`prises an electrically resistive material. Suitable electrically
`resistive materials include but are not limited to: semicon-
`ductors such as doped ceramics, electrically “conductive”
`ceramics (such as, for example, molybdenum disilicide),
`carbon, graphite, metals, metal alloys and composite mate-
`rials made of a ceramic material and a metallic material.
`
`Such composite materials may comprise doped or undoped
`ceramics. Examples of suitable doped ceramics include
`dopedsilicon carbides. Examples of suitable metals include
`titanium, zirconium, tantalum and metals from the platinum
`
`group. Examples of suitable metal alloys include stainless
`steel, Constantan, nickel-, cobalt-, chromium-, aluminium-
`titantum-zirconium-, hafnium-, niobium-, molybdenum-,
`tantalum-, tungsten-, tin-, gallium-, manganese- and iron-
`containing alloys, and super-alloys based on nickel, iron,
`cobalt,
`stainless steel, Timetal®,
`iron-aluminium based
`alloys
`and
`iron-manganese-aluminium based
`alloys.
`Timetal® is a registered trade mark of Titanium Metals
`Corporation, 1999 Broadway Suite 4300, Denver Colo. In
`composite materials, the electrically resistive material may
`optionally be embedded in, encapsulated or coated with an
`insulating material or vice-versa, depending on the kinetics
`of energy transfer and the external physicochemical prop-
`erties required. The heating element may comprise a metal-
`lic etched foil
`insulated between two layers of an inert
`material. In that case,
`the inert material may comprise
`Kapton®, all-polyimide or mica foil. Kapton® is a regis-
`tered trade mark of E.I. du Pont de Nemours and Company,
`1007 Market Street, Wilmington, Del. 19898, United States
`of America.
`
`Alternatively, the at least one electric heating element
`may comprise an infra-red heating element, a photonic
`source or an inductive heating element.
`The at least one electric heating element may take any
`suitable form. For example, the at least one electric heating
`element may take the form of a heating blade. Alternatively,
`the at least one electric heating element may take the form
`of a casing or substrate having different electro-conductive
`portions, or an electrically resistive metallic tube. The liquid
`storage portion may incorporate a disposable heating ele-
`ment. Alternatively, one or more heating needles or rodsthat
`run through the liquid aerosol-forming substrate may also be
`suitable. Alternatively,
`the at
`least one electric heating
`element may be a disk (end) heater or a combination of a
`disk heater with heating needles or rods. Alternatively, the at
`least one electric heating element may comprise a flexible
`sheet of material. Other alternatives include a heating wire
`or filament, for example a Ni—Cr, platinum, tungsten or
`alloy wire, or a heating plate. Optionally, the heating ele-
`ment may be deposited in or on a rigid carrier material.
`Theat least one electric heating element may comprise a
`heat sink, or heat reservoir comprising a material capable of
`absorbing and storing heat and subsequently releasing the
`heat over time to heat the aerosol-forming substrate. The
`heat sink may be formed of any suitable material, such as a
`suitable metal or ceramic material. Preferably, the material
`has a high heat capacity (sensible heat storage material), or
`is a material capable of absorbing and subsequently releas-
`ing heat via a reversible process, such as a high temperature
`phase change. Suitable sensible heat storage materials
`include silica gel, alumina, carbon, glass mat, glass fibre,
`minerals, a metal or alloy such as aluminium, silver or lead,
`and a cellulose material such as paper. Other suitable mate-
`rials which release heat via a reversible phase change
`
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