U.S. patent application number 17/612759 was filed with the patent office on 2022-08-04 for stable wrapper for aerosol generating article.
This patent application is currently assigned to PHILIP MORRIS PRODUCTS S.A.. The applicant listed for this patent is PHILIP MORRIS PRODUCTS S.A.. Invention is credited to Thierry Joyeux.
Application Number | 20220240564 17/612759 |
Document ID | / |
Family ID | 1000006319224 |
Filed Date | 2022-08-04 |
United States Patent
Application |
20220240564 |
Kind Code |
A1 |
Joyeux; Thierry |
August 4, 2022 |
STABLE WRAPPER FOR AEROSOL GENERATING ARTICLE
Abstract
A wrapper used in smoking articles. The wrapper has a low grease
penetration or visual spotting and may be utilized with an aerosol
generating substrate. The aerosol generating article (10) includes
an aerosol generating substrate (12) comprising nicotine and a gel
composition. The wrapper is disposed about and in contact with the
aerosol generating substrate. The wrapper comprise a paper layer
(50) comprising a surface treatment such that the paper has a
negative result for at least one kit oil sample of method Tappi 559
cm-02, classical method 2002.
Inventors: |
Joyeux; Thierry; (Morges,
CH) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
PHILIP MORRIS PRODUCTS S.A. |
Neuchatel |
|
CH |
|
|
Assignee: |
PHILIP MORRIS PRODUCTS S.A.
Neuchatel
CH
|
Family ID: |
1000006319224 |
Appl. No.: |
17/612759 |
Filed: |
June 8, 2020 |
PCT Filed: |
June 8, 2020 |
PCT NO: |
PCT/IB2020/055371 |
371 Date: |
November 19, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24D 1/20 20200101; A24F
40/465 20200101; A24D 1/02 20130101; D21H 17/13 20130101 |
International
Class: |
A24D 1/02 20060101
A24D001/02; A24F 40/465 20060101 A24F040/465; A24D 1/20 20060101
A24D001/20; D21H 17/13 20060101 D21H017/13 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 10, 2019 |
EP |
19179241.5 |
Claims
1-14. (canceled)
15. An aerosol generating article comprising: an aerosol generating
substrate comprising nicotine and greater than about 20% by weight
of an aerosol former; and a wrapper disposed about and in contact
with the aerosol generating substrate, the wrapper comprises a
paper layer comprising a surface treatment such that the paper has
a negative result for at least one kit oil sample of method Tappi
559 cm-02, classical method 2002.
16. The aerosol generating article according to claim 15, wherein
the paper layer having a negative result for at least 5 kit oil
samples of method Tappi 559 cm-02, classical method 2002, or a
negative result for all 10 kit oil samples of method Tappi 559
cm-02, classical method 2002.
17. The aerosol generating article according to claim 15, wherein
the paper layer has a grammage in a range from 25 g/m.sup.2 to 45
g/m.sup.2, and a thickness in a range from 35 micrometers to 50
micrometers.
18. The aerosol generating article according to claim 15, wherein
the paper layer comprises PVOH or silicon.
19. The aerosol generating article according to claim 15, wherein
the paper layer comprises a surface treatment comprising PVOH or
silicon.
20. The aerosol generating article according to claim 15, wherein
the paper layer comprises PVOH.
21. The aerosol generating article according to claim 15, wherein
the paper layer comprises silicon.
22. The aerosol generating article according to claim 15, wherein
the aerosol generating substrate comprises a gel composition.
23. The aerosol generating article according to claim 22, wherein
the gel composition comprises a majority of glycerine.
24. The aerosol generating article according to claim 23, wherein
the gel composition comprises xanthan gum.
25. The aerosol generating article according to claim 15, wherein
the aerosol generating substrate comprises homogenized tobacco
material.
26. The aerosol generating article according to claim 25, wherein
the tobacco homogenized tobacco material comprises tobacco
material, from 1 percent to 5 percent of a binder, and from 5
percent to 30 percent of an aerosol-former, in dry weight
basis.
27. The aerosol generating article according to claim 15, wherein
the aerosol generating substrate comprises a metallic induction
heating element.
28. The aerosol generating article according to claim 15, wherein
the aerosol generating substrate comprises a plurality of metallic
induction heating elements.
29. The aerosol generating article according to claim 15, wherein
the paper layer is in direct contact with the aerosol generating
substrate.
Description
[0001] The present disclosure relates to a wrapper used in smoking
articles, wherein the wrapper has a low grease penetration or
visual spotting and may be utilized with an aerosol generating
substrate.
[0002] Aerosol generating articles in which an aerosol generating
substrate, such as a tobacco containing substrate, is heated rather
than combusted, are known in the art. Typically in such heated
aerosol generating articles, an aerosol is generated by the
transfer of heat from a heat source to a physically separate
aerosol generating substrate or material, which may be located in
contact with, within, around, or downstream of the heat source.
During use of the aerosol generating article, volatile compounds
are released from the aerosol generating substrate by heat transfer
from the heat source and are entrained in air drawn through the
aerosol generating article. As the released compounds cool, they
condense to form an aerosol.
[0003] Paper that is used to wrap the aerosol generating substrate
can absorb aerosol former, water and other liquid compounds found
in the mainstream smoke or aerosol passing through the aerosol
generating article, or humidity or moisture surrounding the paper.
The absorbed liquid may stain or weaken the paper and negatively
affects the appearance and structural integrity of the aerosol
generating article. Heated aerosol generating articles are
particularly susceptible to wetting and breakage due to the high
levels of aerosol former in the aerosol generating substrate of
these heated aerosol generating articles. Heated aerosol generating
articles are particularly susceptible to swelling as aerosol
components are absorbed by the wrapper, leading to difficult
removal from the heating device. Heated aerosol generating articles
are particularly susceptible to breakage when they are tightly
received and then removed from a heating device.
[0004] It would be desirable to provide a visually and mechanically
stable wrapped aerosol generating substrate, particularly for
aerosol generating articles that contain a high level of liquids or
aerosol formers.
[0005] It would be desirable to provide an aerosol generating
article that included a wrapper that did not swell up by absorbing
water or compounds contained in the aerosol generating
substrate.
[0006] It would be desirable to provide an aerosol generating
article that included a wrapper that provided a grease barrier to
grease compounds contained in the aerosol generating substrate.
[0007] It would also be desirable that this wrapper not affect the
taste of the aerosol generated by the aerosol generating
article.
[0008] It would also be desirable that this wrapper not readily
burn if proximate a heating element.
[0009] The purpose of the invention may be to solve at least
partially one or more of the desirable technical benefits mentioned
above.
[0010] According to this disclosure, there is provided an aerosol
generating article includes an aerosol generating substrate
comprising nicotine and a wrapper disposed about the aerosol
generating substrate. The wrapper comprises a paper layer having a
negative result for at least one kit oil sample of method Tappi 559
cm-02, classical method 2002.
[0011] According to this disclosure, there is provided an aerosol
generating article includes an aerosol generating substrate
comprising nicotine and a gel composition and a wrapper disposed
about and in contact with the aerosol generating substrate. The
wrapper comprises a paper layer comprising a surface treatment such
that the paper has a negative result for at least one kit oil
sample of method Tappi 559 cm-02, classical method 2002.
[0012] According to this disclosure, there is provided an aerosol
generating article. The aerosol generating article may comprise an
aerosol generating substrate. The aerosol generating substrate may
include a wrapper. The wrapper may be disposed about the aerosol
generating substrate. The wrapper comprises a paper layer having a
negative result for at least one kit oil sample of method Tappi 559
cm-02, classical method 2002.
[0013] Preferably the paper layer has a negative result for at
least five kit oil samples of method Tappi 559 cm-02, classical
method 2002. Preferably the paper layer has a negative result for
at least eight kit oil samples of method Tappi 559 cm-02, classical
method 2002. Preferably the paper layer has a negative result for
all ten kit oil samples of method Tappi 559 cm-02, classical method
2002.
[0014] Preferably the paper layer has a thickness/grammage in a
range from about 1.0 micrometers/gsm to about 1.2 micrometers/gsm.
The paper layer may have a thickness of less than about 50
micrometers, or less than about 40 micrometers. The wrapper
includes a paper layer having a grammage in a range from about 25
gsm to about 45 gsm, or from about 35 gsm to about 40 gsm.
Preferably, the paper layer has a grammage in a range from about 25
gsm to about 45 gsm, and a thickness in a range from about 35
micrometers to about 50 micrometers.
[0015] Preferably, the paper layer has a negative result for at
least one kit oil sample of method Tappi 559 cm-02, classical
method 2002, and a water contact angle of at least about 30
degrees. The paper layer may have a water contact angle of at least
about 40 degrees, or at least about 45 degrees.
[0016] Preferably, the wrapper comprises a paper layer having an
elongation at break ratio of CD/MD of about 2.5 or less and a
negative result for at least one kit oil sample of method Tappi 559
cm-02 classical method 2002. The paper layer may have a negative
result for at least five kit oil samples, or all ten kit oil
samples of method Tappi 559 cm-02 classical method 2002.
[0017] Preferably, the wrapper includes two paper layers wherein a
first paper layer has a negative result for at least one kit oil
sample of method Tappi 559 cm-02, classical method 2002 and the
second paper layer has a second el having a negative result for at
least one kit oil sample of method Tappi 559 cm-02, classical
method 2002. The wrapper may have a total thickness of less than
about 80 micrometers.
[0018] Preferably, the wrapper comprises PVOH (polyvinyl alcohol)
or silicon. The paper layer may comprise a surface treatment
comprising PVOH or silicon. Addition of PVOH (polyvinyl alcohol) or
silicon may improve the grease barrier properties of the
wrapper.
[0019] The term "silicon" refers to siloxane. Silicon or siloxane
preferably comprises a polydimethylsiloxane.
[0020] Preferably, the aerosol generating substrate may comprise
homogenized tobacco material. The tobacco homogenized tobacco
material may comprise tobacco material, from about 1% to about 5%
of a binder, and from about 5% to about 30% of an aerosol-former,
in dry weight basis.
[0021] Preferably, the aerosol generating substrate may comprise a
gel composition. The gel composition may comprise a majority (by
weight) of glycerine. The gel composition may comprise xanthan
gum.
[0022] Preferably, the aerosol generating substrate may comprise a
metallic induction heating element. The metallic induction heating
element may comprise plurality of metallic induction heating
elements. The metallic induction heating element may comprise a
metallic induction heating ring element.
[0023] The wrapper may be formed of a single paper layer. The
wrapper may be formed of two layers of paper. The wrapper may be
formed of more than two layers of paper.
[0024] Preferably the wrapper covers at least 20%, at least 50%, at
least 80%, at least 90%, at least 95%, at least 99% or
preferentially about the full length (the entire length) of the
aerosol generating substrate. The wrapper preferably covers the
entire aerosol generating substrate and does not extend beyond the
aerosol generating substrate.
[0025] When the wrapper has two or more paper layers, a first paper
layer may possess the unique properties described herein and a
second paper layer may be considered a conventional paper layer.
The second paper layer may preferably be disposed over the first
paper layer.
[0026] Alternatively, the first paper layer may be disposed over
the second paper layer. Preferably the first paper layer, having
the unique properties described herein, is in contact with the
aerosol forming substrate.
[0027] When the wrapper has two or more paper layers, a first paper
layer may possess the unique properties described herein and a
second paper layer may also possess the unique properties described
herein. All the paper layers forming the wrapper may possess the
unique properties described herein. In particular, one or both
paper layers forming the wrapper may comprises PVOH (polyvinyl
alcohol) or silicon. One or both paper layers forming the wrapper
may comprise a surface treatment comprising PVOH or
silicon.Advantageously, smoking articles or aerosol generating
articles that include a paper wrapper described herein may reduce
wetting and absorption of water, humectants, or grease in the smoke
or aerosol passing through the smoking article or aerosol
generating article. As a result, visible staining and physical
weakening of the wrapper portion of the smoking article or aerosol
generating article may be reduced even when a high level of
humectant is included in the aerosol generating substrate.
[0028] Paper wrappers having a negative result for at least one kit
oil sample of method Tappi 559 cm-02, classical method 2002 exhibit
reduced paper swelling. Preferably paper wrappers having a negative
result for at least five kit oil samples of method Tappi 559 cm-02,
classical method 2002 exhibit reduced paper swelling. Preferably
paper wrappers having a negative result for all ten kit oil samples
of method Tappi 559 cm-02, classical method 2002 exhibit reduced
paper swelling.
[0029] Advantageously, aerosol generating articles that include a
wrapper described herein may reduce wetting, absorption of water,
aerosol formers, or grease in the smoke or aerosol passing through
the aerosol generating article. As a result, swelling, visible
staining and physical weakening of the wrapper portion of the
aerosol generating article may be reduced even when a high level of
aerosol former is included in the aerosol generating substrate.
[0030] Advantageously, the aerosol generating article provides a
visually and mechanically stable wrapped aerosol generating
substrate that avoids swelling. This is particularly useful for
heat-not-burn aerosol generating articles that may be inserted into
heating device. The aerosol generating article wrapper resists
burning if proximate a heating element, thus inductive heating
elements may be incorporated throughout the aerosol generating
substrate.
[0031] The term "aerosol generating article" is used herein to
denote an article wherein an aerosol generating substrate is heated
to produce and deliver inhalable aerosol to a consumer. As used
herein, the term "aerosol generating substrate" denotes a substrate
capable of releasing volatile compounds upon heating to generate an
aerosol.
[0032] A conventional cigarette is lit when a user applies a flame
to one end of the cigarette and draws air through the other end.
The localised heat provided by the flame and the oxygen in the air
drawn through the cigarette causes the end of the cigarette to
ignite, and the resulting combustion generates an inhalable smoke.
By contrast, in heated aerosol generating articles, an aerosol is
generated by heating a flavour generating substrate, such as
tobacco. Known heated aerosol generating articles include, for
example, electrically heated aerosol generating articles and
aerosol generating articles in which an aerosol is generated by the
transfer of heat from a combustible fuel element or heat source to
a physically separate aerosol forming substrate. For example,
aerosol generating articles according to the disclosure find
particular application in aerosol generating systems comprising an
electrically heated aerosol generating device having an internal
heater blade which is adapted to be inserted into the rod of
aerosol generating substrate. Aerosol generating articles of this
type are described in the prior art, for example, in EP
0822670.
[0033] As used herein, the term "aerosol generating device" refers
to a device comprising a heater element that interacts with the
aerosol generating substrate of the aerosol generating article to
generate an aerosol.
[0034] As used herein, the term "aerosol generating system" refers
to a combination of an aerosol generating device and an aerosol
generating article.
[0035] The term "aerosol generating substrate" refers to substance
capable of generating or releasing an aerosol. The aerosol
generating substrate may be a solid, paste, gel, slurry, liquid, or
comprise any combination of solid, paste, gel, slurry, and liquid
compounds. Preferably the aerosol generating substrate is a solid,
or a gel composition. The aerosol generating substrate may
preferably include nicotine.
[0036] The aerosol generating article may comprise an aerosol
generating substrate and a mouthpiece. The mouthpiece may comprise
a filter. A tipping wrapper may join the filter to the aerosol
generating substrate.
[0037] An aerosol generating substrate may be a solid composition.
This composition may include plant-based material. The aerosol
generating substrate may include tobacco, and preferably the
tobacco contains volatile tobacco flavour compounds, which are
released from the aerosol generating substrate upon heating. The
aerosol generating substrate may comprise homogenized tobacco
material, aerosol former and a binder.
[0038] Nicotine may be present in the aerosol generating substrate
in a range from about 0.5 to about 10% wt, nicotine, or about 0.5
to about 5% wt. nicotine. Preferably the aerosol generating
substrate may include about 1 to about 3% wt, nicotine, or about
1.5 to about 2.5% wt. nicotine, or about 2% wt nicotine.
[0039] The aerosol generating substrate may include a flavourant.
Botanical materials provide flavourant that may impart a flavour to
the taste of the aerosol generated by the aerosol generating
article. A flavourant is any natural or artificial compound that
affects the organoleptic quality of the aerosol. Non-limiting
examples of sources of flavourants include mints such as peppermint
and spearmint, coffee, tea, cinnamon, clove, cocoa, vanilla,
eucalyptus, geranium, agave, and juniper; and combinations
thereof.
[0040] The aerosol generating substrate may include an essential
oil. Essential oils may provide flavourant that may impart a
flavour to the taste of the aerosol generated by the aerosol
generating article. Suitable essential oils include, but are not
limited to, eugenol, peppermint oil and spearmint oil. A preferred
essential oil is eugenol. Essential oil may be present in the
aerosol generating substrate in an amount of at least about 0.1% by
weight, or at least about 0.5% by weight, or at least about 1% by
weight. Essential oil may be present in the aerosol generating
substrate in a range from about 0.1% by weight to about 10% by
weight, or from about 0.1% by weight to about 5% by weight, or from
about 0.5% by weight to about 2%.
[0041] An aerosol generating substrate may include a gel
composition. The term "gel" refers to a solid at room temperature.
"Solid" in this context means that the gel has a stable size and
shape and does not flow. Room temperature in this context means 25
degrees Celsius. A gel may be defined as a substantially dilute
cross-linked system, which exhibits no flow when in the
steady-state. By weight, gels may be mostly liquid, yet they behave
like solids due to a three-dimensional cross-linked network within
the liquid. It is the crosslinking within the fluid that gives a
gel its structure (hardness). In this way gels may be a dispersion
of molecules of a liquid within a solid in which liquid particles
are dispersed in the solid medium.
[0042] The gel composition may include a gelling agent forming a
solid medium, an aerosol former such as glycerine dispersed in the
solid medium, and nicotine dispersed in the glycerine. The
composition forming a stable gel phase. The gel composition may
include at least two gelling agents forming a solid medium,
glycerine dispersed in the solid medium, and nicotine dispersed in
the glycerine. The composition forming a stable gel phase. The gel
composition may include a viscosifying agent, and gelling agent
forming a solid medium, glycerine dispersed in the solid medium,
and nicotine dispersed in the glycerine. The composition forming a
stable gel phase. A gel composition may include nicotine, an
aerosol former, a viscosifying agent, a hydrogen-bond crosslinking
gelling agent, and an ionic crosslinking gelling agent. The gel
composition may further include divalent cations.
[0043] The term "viscosifying agent" refers to a compound that,
when added homogeneously into a 25.degree. C., 50% wt water/50% wt
glycerine mixture, in an amount of 0.3% wt., increases the
viscosity without leading to the formation of a gel, the mixture
staying or remaining fluid. Preferably, the viscosifying agent
refers to a compound that when added homogeneously into a
25.degree. C. 50% wt water/50% wt glycerine mixture, in an amount
of 0.3% wt, increases the viscosity to at least 50 cPs, preferably
at least 200 cPs, preferably at least 500 cPs, preferably at least
1000 cPs at a shear rate of 0.1 s.sup.-1, without leading to the
formation of a gel, the mixture staying or remaining fluid.
Preferably, the viscosifying agent refers to a compound that when
added homogeneously into a 25.degree. C. 50% wt water/50% wt
glycerine mixture, in an amount of 0.3% wt, increases the viscosity
at least 2 times, or at least 5 times, or at least 10 times, or at
least 100 times higher than before addition, at a shear rate of 0.1
s.sup.-1, without leading to the formation of a gel, the mixture
staying or remaining fluid.
[0044] The viscosity values recited herein can be measured using
Brookfield RVT viscometer rotating a disc type RV #2 spindle at
25.degree. C. at a speed of 6 revolutions per minute (rpm).
[0045] The term "gelling agent" refers to a compound that
homogeneously, when added to a 50% wt. water/50% wt. glycerine
mixture, in an amount of about 0.3% wt, forms a solid medium or
support matrix leading to a gel. Gelling agents include, but not
limited to, hydrogen-bond crosslinking gelling agents, and ionic
crosslinking gelling agents.
[0046] The term "hydrogen-bond crosslinking gelling agent" refers
to a gelling agent that forms non-covalent crosslinking bonds or
physical crosslinking bonds via hydrogen bonding. Hydrogen bonding
is a type of electrostatic dipole-dipole attraction between
molecules, not a covalent bond to a hydrogen atom. It results from
the attractive force between a hydrogen atom covalently bonded to a
very electronegative atom such as a N, O, or F atom and another
very electronegative atom.
[0047] The term "ionic crosslinking gelling agent" refers to a
gelling agent that forms non-covalent crosslinking bonds or
physical crosslinking bonds via ionic bonding. Ionic crosslinking
involves the association of polymer chains by noncovalent
interactions. A crosslinked network is formed when multivalent
molecules of opposite charges electrostatically attract each other
giving rise to a crosslinked polymeric network.
[0048] The gel composition includes an aerosol former. Ideally the
aerosol former is substantially resistant to thermal degradation at
the operating temperature of the associated aerosol generating
device. Suitable aerosol formers include, but are not limited to:
polyhydric alcohols, such as triethylene glycol, 1, 3-butanediol
and glycerine; esters of polyhydric alcohols, such as glycerine
mono-, di- or triacetate; and aliphatic esters of mono-, di- or
polycarboxylic acids, such as dimethyl dodecanedioate and dimethyl
tetradecanedioate. Polyhydric alcohols or mixtures thereof, may be
one or more of triethylene glycol, 1, 3-butanediol and, glycerine
(glycerine or propane-1,2,3-triol) or polyethylene glycol. The
aerosol former is preferably glycerine.
[0049] The gel composition may include a majority of aerosol former
such as glycerine. The gel composition may include a mixture of
water and the glycerine where the glycerine forms a majority (by
weight) of the gel composition. The glycerine may form at least
about 50% wt. of the gel composition. The glycerine may form at
least about 60% wt., or about 65% wt., or about 70% wt. of the gel
composition. The glycerine may form at about 70% wt. to about 80%
wt. of the gel composition. The glycerine may form at about 70% wt.
to about 75% wt. of the gel composition.
[0050] The gel composition preferably comprises no water or a low
level of water. When the gel composition comprises no water or a
low level of water, the gel composition may comprise a higher level
of other compounds such as aerosol-former, gelling agent,
viscosifying agent, and nicotine. Also, gel compositions comprising
no water or a low level of water are easier and require less energy
to vaporize. Aerosols formed from a gel composition comprising no
water or a low level of water can be perceived as less hot by the
user. Preferably, the gel composition comprises less than about 40%
wt, preferably less than about 30% wt, preferably less than about
25% wt water. The gel composition may comprise less than about 20%
wt or less than about 15% wt or less than about 10% wt or less than
about 5% wt of water. The gel composition may preferably comprise
some water. The gel composition is more stable when the composition
comprises some water. Preferably, the gel composition comprises at
least about 1% wt, or at least about 2% wt or at least about 5% wt
of water. Preferably, the gel composition comprises at least about
10% wt or at least about 15% wt water. Preferably, the gel
composition comprises a range from about 15% wt to about 25% wt
water.
[0051] The gel composition may include gelling agents being the
hydrogen-bond crosslinking gelling agent and the ionic crosslinking
gelling agent. The gel composition may further include a
viscosifying agent. The gelling agents may form a solid medium in
which the aerosol-former may be dispersed. The gelling agents may
form a solid medium in which the aerosol-former and water may be
dispersed. The viscosifying agent combined with the hydrogen-bond
crosslinking gelling agent and the ionic crosslinking gelling agent
appears to surprisingly support the solid medium and maintain the
gel composition even when the gel composition comprises a high
level of glycerine.
[0052] The gel composition may include the gelling agents in a
range from about 0.4% to about 10% by weight. Preferably the
composition may include the gelling agents in a range from about
0.5% to about 8% by weight. Preferably the composition may include
the gelling agents in a range from about 1% to about 6% by weight.
Preferably the composition may include the gelling agents in a
range from about 2% to about 4% by weight. Preferably the
composition may include the gelling agents in a range from about 2%
to about 3% by weight.
[0053] The gel composition may include the viscosifying agent in a
range from about 0.2% to about 5% by weight. Preferably the
viscosifying agent in a range from about 0.5% to about 3% by
weight. Preferably the viscosifying agent in a range from about
0.5% to about 2% by weight. Preferably the viscosifying agent in a
range from about 1% to about 2% by weight.
[0054] The gel composition may include the viscosifying agent,
hydrogen-bond crosslinking gelling agent, and ionic crosslinking
gelling agent being present in the gel composition in a total
amount from about 1% wt to about 8% wt. Preferably the gel
composition may include the viscosifying agent, hydrogen-bond
crosslinking gelling agent, and ionic crosslinking gelling agent
being present in the gel composition in a total amount from about
2% wt to about 6% wt. Preferably the gel composition may include
the viscosifying agent, hydrogen-bond crosslinking gelling agent,
and ionic crosslinking gelling agent being present in the gel
composition in a total amount from about 3% wt to about 5% wt.
[0055] The gel composition may include the viscosifying agent,
hydrogen-bond crosslinking gelling agent, and ionic crosslinking
gelling agent each independently present in the gel composition in
a range from about 0.3% wt to about 3% wt. Preferably the gel
composition may include the viscosifying agent, hydrogen-bond
crosslinking gelling agent, and ionic crosslinking gelling agent
each independently present in the gel composition in a range from
about 0.5% wt to about 2% wt. Preferably the gel composition may
include the viscosifying agent, hydrogen-bond crosslinking gelling
agent, and ionic crosslinking gelling agent each independently
present in the gel composition in a range from about 1% wt to about
2% wt.
[0056] The viscosifying agent may include one or more of xanthan
gum, carboxymethyl-cellulose, microcrystalline cellulose, methyl
cellulose, gum Arabic, guar gum, lambda carrageenan, or starch. The
viscosifying agent may preferably include xanthan gum.
[0057] The gel composition may include viscosifying agent such as
xanthan gum in a range from about 0.2% to about 5% by weight.
Preferably the xanthan gum may be in a range from about 0.5% to
about 3% by weight. Preferably the xanthan gum may be in a range
from about 0.5% to about 2% by weight. Preferably the xanthan gum
may be in a range from about 1% to about 2% by weight.
[0058] The hydrogen-bond crosslinking gelling agent may include one
or more of a galactomannan, gelatin, agarose, or konjac gum, or
agar. The hydrogen-bond crosslinking gelling agent may preferably
include agar.
[0059] The gel composition may include the hydrogen-bond
crosslinking gelling agent such as agar in a range from about 0.3%
to about 5% by weight. Preferably the composition may include the
hydrogen-bond crosslinking gelling agent in a range from about 0.5%
to about 3% by weight. Preferably the composition may include the
hydrogen-bond crosslinking gelling agent in a range from about 1%
to about 2% by weight.
[0060] The ionic crosslinking gelling agent may include low acyl
gellan, pectin, kappa carrageenan, iota carrageenan or alginate.
The ionic crosslinking gelling agent may preferably include low
acyl gellan.
[0061] The gel composition may include the ionic crosslinking
gelling agent such as low acyl gellan in a range from about 0.3% to
about 5% by weight. Preferably the composition may include the
ionic crosslinking gelling agent in a range from about 0.5% to
about 3% by weight. Preferably the composition may include the
ionic crosslinking gelling agent in a range from about 1% to about
2% by weight.
[0062] The gel composition may further include a divalent cation.
Preferably the divalent cation may include calcium ions, such as
calcium lactate in solution. Divalent cations (such as calcium
ions) may assist in the gel formation of compositions that include
gelling agents such as the ionic crosslinking gelling agent, for
example. The ion effect may assist in the gel formation. The
divalent cation may be present in the gel composition in a range
from about 0.1 to about 1% by weight, or about 0.5% wt.
[0063] The gel composition may further include an acid. The acid
may comprise a carboxylic acid. The carboxylic acid may include a
ketone group. Preferably the carboxylic acid may include a ketone
group has less than about 10 carbon atoms, or less than about 6
carbon atoms or less than about 4 carbon atoms, such as levulinic
acid or lactic acid. Preferably this carboxylic acid has three
carbon atoms (such as lactic acid). Lactic acid surprisingly
improves the stability of the gel composition even over similar
carboxylic acids. The carboxylic acid may assist in the gel
formation. The carboxylic acid may reduce variation of the nicotine
concentration within the gel composition during storage.
[0064] The gel composition may include a carboxylic acid such as
lactic acid in a range from about 0.1% to about 5% by weight.
Preferably the carboxylic acid may be in a range from about 0.5% to
about 3% by weight. Preferably the carboxylic acid may be in a
range from about 0.5% to about 2% by weight. Preferably the
carboxylic acid may be in a range from about 1% to about 2% by
weight.
[0065] Nicotine is included in the gel compositions. The nicotine
may be added to the composition in a free base form or a salt form.
The gel composition may include about 0.5 to about 10% wt,
nicotine, or about 0.5 to about 5% wt. nicotine. Preferably the gel
composition may include about 1 to about 3% wt, nicotine, or about
1.5 to about 2.5% wt. nicotine, or about 2% wt nicotine. The
nicotine component of the gel formulation may be the most volatile
component of the gel formulation. In some aspects water may be the
most volatile component of the gel formulation and the nicotine
component of the gel formulation may be the second most volatile
component of the gel formulation.
[0066] An aerosol generating system may comprise: a heat source; an
aerosol generating substrate; at least one air inlet downstream of
the aerosol generating substrate; and an airflow pathway extending
between the at least one air inlet and the mouth-end of the
article. The heat source is preferably upstream from the aerosol
generating substrate. The heat source may be integral with an
aerosol generating device and a consumable aerosol generating
article may be releasably received within the aerosol generating
device.
[0067] The heat source may be a combustible heat source, a chemical
heat source, an electrical heat source, a heat sink or any
combination thereof. The heat source may be an electrical heat
source, preferably shaped in the form of a blade that can be
inserted into the aerosol generating substrate. Alternatively, the
heat source may be configured to surround the aerosol generating
substrate, and as such may be in the form of a hollow cylinder, or
any other such suitable form. Alternatively, the heat source is a
combustible heat source. As used herein, a combustible heat source
is a heat source that is itself combusted to generate heat during
use, which unlike a cigarette, cigar or cigarillo, does not involve
combusting the aerosol generating substrate. A combustible heat
source may comprise carbon and an ignition aid, such as a metal
peroxide, superoxide, or nitrate, wherein the metal is an alkali
metal or alkaline earth metal.
[0068] The aerosol generating substrate may include an induction
heating element or susceptor or a plurality of induction heating
elements or susceptors. Induction heating elements or susceptors
heat up in the presence of an alternating or fluctuating
electromagnetic field. When heating is by induction heating, a
fluctuating electromagnetic field is transmitted through the
aerosol generating article to the induction heating element or
susceptor such that the susceptor or inducting heating element
changes the fluctuating field into thermal energy thus heating the
aerosol generating substrate.
[0069] The induction heating element or susceptor may be formed
from any material that can be inductively heated to a temperature
sufficient to generate an aerosol from the aerosol generating
substrate. The induction heating element or susceptor may comprises
a metal or carbon. A preferred induction heating element or
susceptor may comprise a ferromagnetic material, for example
ferritic iron, or a ferromagnetic steel or stainless steel. The
induction heating element or susceptor may comprise aluminium.
Induction heating element or susceptors may be formed from 400
series stainless steels, for example grade 410, or grade 420, or
grade 430 stainless 20 steel. Different materials will dissipate
different amounts of energy when positioned within electromagnetic
fields having similar values of frequency and field strength.
Preferably, the induction heating element or susceptors are heated
to a temperature in excess of 250 degrees Celsius. However,
preferably the induction heating element or susceptors are heated
less than 350 degrees Celsius to prevent burning of material in
contact with the susceptor.
[0070] The induction heating element or susceptor may be located
proximate the wrapper of the aerosol generating substrate since the
wrapper described herein advantageously resists combustion.
[0071] The term "mouthpiece" is used herein to indicate the portion
of the aerosol generating article that is designed to be contacted
with the mouth of the consumer. The mouthpiece can be the portion
of the aerosol generating article that may include a filter, or in
some cases the mouthpiece can be defined by the extent of the
tipping wrapper. In other cases, the mouthpiece can be defined as a
portion of the aerosol generating article extending about 40 mm
from the mouth end of the aerosol generating article or extending
about 30 mm from the mouth end of the aerosol generating
article.
[0072] The terms "upstream" and "downstream" refer to relative
positions of elements of the aerosol generating article described
in relation to the direction of aerosol as it is drawn from an
aerosol generating substrate and through the mouthpiece.
[0073] The term "wrapper" or "paper wrapper" are interchangeable
and refer to one or more layers of wrapping material that
circumscribes an aerosol generating substrate to contain the
aerosol generating substrate or maintain the shape of the aerosol
generating article and is formed of paper. The wrapper mitigates
spotting on the exterior surface of the aerosol generating article.
Preferably the wrapper contacts the aerosol generating
substrate.
[0074] The term "hydrophobic" refers to a surface exhibiting water
repelling properties. One useful way to determine this is to
measure the water contact angle. The "water contact angle" is the
angle, conventionally measured through the liquid, where a
liquid/vapour interface meets a solid surface. It quantifies the
wettability of a solid surface by a liquid via the Young equation.
Hydrophobicity or water contact angle may be determined by
utilizing TAPPI T558 test method and the result is presented as an
interfacial contact angle and reported in "degrees" and can range
from near zero to near 180 degrees.
[0075] Grease penetration is reported according to test method
Tappi 559 cm-02, classical method 2002. This test method determines
the grease penetrability of paper or the wrapper. This test method
measures the level of penetration by dropping a mixture of castor
oil and solvent onto it. These mixtures are a set of 10 kits, which
are prepared with castor oil, n-heptane and toluene as described in
following table. The total volume of one kit is 10 ml.
TABLE-US-00001 Kit number Castor oil [g] n-heptane [ml] Toluene
[ml] 1 9.69 0 0 2 8.721 0.5 0.5 3 7.752 1 1 4 6.783 1.5 1.5 5 5.814
2 2 6 4.845 2.5 2.5 7 3.876 3 3 8 2.907 3.5 3.5 9 1.938 4 4 10
0.969 4.5 4.5
[0076] The sample is placed on a dark surface, testing side
upwards. Starting from kit 1, a 25 .mu.l drop is deposited onto the
paper with a micropipette fixed at a height of 13 mm above the
sample. After 15 seconds, the surplus is cleaned and immediately
after the paper surface is visually examined to check if dark spots
appear. Then the paper is removed to carefully check if there are
drops on the dark surface. The results are reported as follows:
[0077] If the paper shows spots only on the surface, the test is
positive for this kit, and the result is "visible through". [0078]
If the dark surface shows spots, the test is positive for this kit,
and the results is "pass through". [0079] If there is not any spot,
the result for this kit is negative. The test is repeated with the
next kits until the result is "pass through" or reaches the last
test kit (kit 10). When the appropriate test kit has been
identified, the measurement must be performed at least three times
to verify the "positive" spotting.
[0080] The present disclosure relates to a wrapper used in aerosol
generating articles, wherein the wrapper comprises a paper layer
having a low grease penetration or grease spotting and may be
utilized with an aerosol generating substrate. According to this
disclosure, there is provided an aerosol generating article
comprising an aerosol generating substrate comprising nicotine, and
a wrapper disposed about the aerosol generating substrate. The
wrapper comprises a paper layer having a low grease penetrability
and having a negative result for at least one kit oil sample of
method Tappi 559 cm-02, classical method 2002, preferably having a
negative result for at least five kit oil samples of method Tappi
559 cm-02, classical method 2002, and preferably having a negative
result for all ten kit oil samples of method Tappi 559 cm-02,
classical method 2002.
[0081] The paper layer may have a thickness/grammage in a range
from about 0.8 micrometers/gsm to about 1.2 micrometers/gsm. The
paper layer may have a thickness/grammage in a range from about 1.0
micrometers/gsm to about 1.2 micrometers/gsm. The paper layer may
have a thickness/grammage in of about 1.0 micrometers/gsm. The
paper layer may have a thickness/grammage of about 0.9
micrometers/gsm. The paper layer may have a thickness/grammage of
about 1.0 micrometers/gsm. The paper layer may have a
thickness/grammage of about 1.1 micrometers/gsm. The paper layer
may have a thickness/grammage in of about 1.2 micrometers/gsm.
[0082] The paper layer may have a thickness of less than about 50
micrometers, or less than about 40 micrometers. The paper layer may
have a thickness in a range from about 10 micrometers to about 50
micrometers. The paper layer may have a thickness in a range from
about 20 micrometers to about 50 micrometers. The paper layer may
have a thickness in a range from about 30 micrometers to about 50
micrometers. The paper layer may have a thickness in a range from
about 35 micrometers to about 50 micrometers. The paper layer may
have a thickness in a range from about 35 micrometers to about 40
micrometers. The paper layer may have a thickness in a range from
about 40 micrometers to about 50 micrometers.
[0083] The paper layer may have a grammage in a range from about 25
gsm to about 45 gsm. The paper layer may have a grammage in a range
from about 30 gsm to about 45 gsm. The paper layer may have a
grammage in a range from about 35 gsm to about 45 gsm. The paper
layer may have a grammage in a range from about 35 gsm to about 40
gsm.
[0084] In one embodiment, a paper layer has a negative result for
all ten kit oil samples of method Tappi 559 cm-02, classical method
2002.
[0085] In one embodiment, a paper layer has a negative result for
all ten kit oil samples of method Tappi 559 cm-02, classical method
2002. This paper layer has a grammage of about 35 gsm to about 40
gsm and a thickness of about 35 micrometers to about 45
micrometers.
[0086] In one embodiment, a paper layer has a negative result for
all ten kit oil samples of method Tappi 559 cm-02, classical method
2002. This paper layer has a grammage of about 35 gsm to about 40
gsm and a thickness of about 35 micrometers to about 45
micrometers. This paper layer has a water contact angle of about 35
degrees to about 50 degrees.
[0087] Preferably, the paper layer comprises PVOH (polyvinyl
alcohol) or silicon. In one embodiment the paper layer includes
PVOH (polyvinyl alcohol). The PVOH may be applied to the paper
layer as a surface coating. The PVOH may be disposed on the
exterior surface of the paper layer of the aerosol generating
article. The PVOH may be disposed on and form a layer on the
exterior surface of the paper layer of the aerosol generating
article. The PVOH may be disposed on the interior surface of the
paper layer of the aerosol generating article. The PVOH may be
disposed on and form a layer on the interior surface of the paper
layer of the aerosol generating article. The PVOH may be disposed
on the interior surface and the exterior surface of the paper layer
of the aerosol generating article. The PVOH may be disposed on and
form a layer on the interior surface and the exterior surface of
the paper layer of the aerosol generating article.
[0088] The paper layer may comprise a surface treatment comprising
PVOH or silicon. The paper layer may comprise a surface treatment
comprising PVOH. The paper layer may comprise a surface treatment
comprising silicon. This surface treatment may be applied to the
exterior surface of the paper layer. This surface treatment may be
applied to the interior surface of the paper layer. This surface
treatment may be applied to the exterior and interior surface of
the paper layer. Addition of PVOH or silicon may improve the grease
barrier properties of the paper layer.
[0089] The aerosol generating substrate may include a gel
composition. The gel composition may comprise a majority of aerosol
former such as glycerine. The gel composition may include nicotine,
at least about 50% wt. glycerine or at least 70% wt. glycerine, at
least about 0.2% wt. hydrogen-bond crosslinking gelling agent, at
least about 0.2% wt. ionic crosslinking gelling agent, and at least
about 0.2% wt. viscosifying agent. The gel composition may comprise
xanthan gum.
[0090] The aerosol generating substrate may include homogenized
tobacco material. The tobacco homogenized tobacco material may
comprise tobacco material, from about 1% to about 5% of a binder,
and from about 5% to about 30% of an aerosol-former, in dry weight
basis.
[0091] The aerosol generating substrate may comprise a metallic
induction heating element. The metallic induction heating element
may comprise plurality of metallic induction heating elements. The
metallic induction heating element may comprise a metallic
induction heating ring element.
[0092] It is contemplated that the wrapper described herein may
reduce and prevent formation of spots on an aerosol generating
article that are visible to a consumer. It has been observed that
spots can appear on an aerosol generating article upon storage in a
humid environment or during consumption. The spots can be caused by
absorption of water or aerosol former, including any coloured
substances that are suspended or dissolved, into the web of
cellulosic fibers that constitutes the wrapper. Without being bound
by any theory, the water or aerosol former interacts with the
cellulosic fibers of the paper and alters the organization of the
fibers resulting in a local change in the optical properties, such
as brightness, color, and opacity, and mechanical properties, such
as tensile strength, permeability of the wrapper.
[0093] It is contemplated that the wrapper described herein may
reduce and prevent swelling of the aerosol generating article.
Reducing or preventing swelling of the aerosol generating article
improves the usability of the aerosol generating article to
securely insert and remove the aerosol generating article from a
heating device without damage to the aerosol generating
article.
[0094] The wrapper is the portion of the aerosol generating article
that is disposed about the aerosol generating substrate to help
maintain the cylindrical form of the aerosol generating article.
The wrapper may contain the aerosol generating substrate over at
least about 50% of the length of the plug of aerosol generating
substrate. Preferably the wrapper contains the aerosol generating
substrate over at least about 90% of the length of the plug of
aerosol generating substrate. More preferably the wrapper contains
the aerosol generating substrate over at least about 100% of the
length of the plug of aerosol generating substrate.
[0095] This wrapper may exhibit a range of permeability including
not being permeable. Permeability of cigarette paper is determined
by utilizing the International Standard test method ISO 2965:2009
and the result is presented as cubic centimetres per minute per
square centimetre and referred to as "CORESTA units". The
permeability of the wrapper described herein may be in a range from
about 1 to about 10 CORESTA units, about 5 to about 20 CORESTA
units, or about 1 to about 5 CORESTA units.
[0096] The wrapper may be formed of any cellulosic material such as
paper, wood, textile, natural as well as artificial fibers.
Preferably the wrapper does not include fillers, such as calcium
carbonate. Preferably the wrapper is formed of at least 90% wt
cellulosic material. Preferably the wrapper is formed of at least
95% wt cellulosic material.
[0097] The paper layer may be formed of any cellulosic material
such as paper, wood, textile, natural as well as artificial fibers.
Preferably the paper layer does not include fillers, such as
calcium carbonate. Preferably the paper layer is formed of at least
90% wt cellulosic material. Preferably the paper layer is formed of
at least 95% wt cellulosic material.
[0098] The surface of the paper layer may have a water contact
angle of at least about 30 degrees, at least about 35 degrees, at
least about 40 degrees, or at least about 45 degrees.
Hydrophobicity or water contact angle is determined by utilizing
the TAPPI T558 test and the result is presented as an interfacial
contact angle and reported in "degrees" and can range from near
zero degrees to near 180 degrees.
[0099] The paper layer may have a negative result (no visible
spotting) for at least one kit oil sample of method Tappi 559 cm-02
classical method 2002. The paper layer may have a negative result
for at least five kit oil samples, or all ten kit oil sample of
method Tappi 559 cm-02 classical method 2002.
[0100] The wrapper may include two layers of paper wherein a first
layer has a negative result for at least one kit oil sample of
method Tappi 559 cm-02 classical method 2002 and the second paper
has a negative result for at least one kit oil sample of method
Tappi 559 cm-02 classical method 2002. The wrapper has a total
thickness of less than about 80 micrometers.
[0101] The wrapper may include two layers of paper wherein the
first layer contacts the aerosol forming substrate and the second
layer overlays the first layer. The first layer may comprise PVOH
(polyvinyl alcohol) or silicon or comprise a surface treatment
comprising PVOH or silicon. The second layer may comprise PVOH
(polyvinyl alcohol) or silicon or comprise a surface treatment
comprising PVOH or silicon. Both of the first and second layers may
comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface
treatment comprising PVOH or silicon. Only the first layer may
comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface
treatment comprising PVOH or silicon. Only the second layer may
comprise PVOH (polyvinyl alcohol) or silicon or comprise a surface
treatment comprising PVOH or silicon
[0102] Aerosol generating articles include an aerosol generating
substrate that may comprise a charge of tobacco circumscribed by
the wrapper described herein. The aerosol generating substrate may
comprise any suitable type or types of tobacco material or tobacco
substitute, in any suitable form. The aerosol generating substrate
may include flue-cured tobacco, Burley tobacco, Maryland tobacco,
Oriental tobacco, specialty tobacco, homogenized or reconstituted
tobacco, or any combination thereof. The aerosol generating
substrate may be provided in the form of tobacco cut filler,
tobacco lamina, processed tobacco materials, such as volume
expanded or puffed tobacco, processed tobacco stems, such as
cut-rolled or cut-puffed stems, homogenized tobacco, reconstituted
tobacco, cast leaf tobacco, or blends thereof, and the like. The
term "tobacco cut filler" is used herein to indicate tobacco
material that is predominately formed from the lamina portion of
the tobacco leaf. The terms "tobacco cut filler" is used herein to
indicate both a single species of Nicotiana and two or more species
of Nicotiana forming a tobacco cut filler blend.
[0103] As used herein, the term "homogenised tobacco" denotes a
material formed by agglomerating particulate tobacco. Homogenized
tobacco may include reconstituted tobacco or cast leaf tobacco, or
a mixture of both. The term "reconstituted tobacco" refers to
paper-like material that can be made from tobacco by-products, such
as tobacco fines, tobacco dusts, tobacco stems, or a mixture of the
foregoing. Reconstituted tobacco can be made by extracting the
soluble chemicals in the tobacco by-products, processing the
leftover tobacco fibers into a sheet, and then reapplying the
extracted materials in concentrated form onto the sheet. The term
"cast leaf tobacco" is used herein to refer to a product resulting
from a process well known in the art, which is based on casting a
slurry comprising ground tobacco particles and a binder (for
example, guar) onto a supportive surface, such as a belt conveyor,
drying the slurry and removing the dried sheet from the supportive
surface. Exemplary methods for producing these types of aerosol
generating substrates are described in U.S. Pat. Nos. 5,724,998;
5,584,306; 4,341,228; 5,584,306 and 6,216,706. The homogenised
tobacco may be formed into a sheet which is crimped, convoluted,
folded, or otherwise compressed, before being wrapped to form a
rod. For example, sheets of homogenised tobacco material for use in
the invention may be crimped using a crimping unit of the type
described in CH-A-691156, which comprises a pair of rotatable
crimping rollers. However, it will be appreciated that sheets of
homogenised tobacco material for use in the invention may be
textured using other suitable machinery and processes that deform
or perforate the sheets of homogenised tobacco material.
[0104] The aerosol generating substrate used in aerosol generating
articles generally includes a higher level of aerosol former(s)
than combusted smoking articles, such as cigarettes. Humectants can
also be referred to as an "aerosol former". An aerosol former is
used to describe any suitable known compound or mixture of
compounds that, in use, facilitates formation of an aerosol and
that is substantially resistant to thermal degradation at the
operating temperature of the aerosol generating substrate. Suitable
aerosol-formers are known in the art and include, but are not
limited to: polyhydric alcohols, such as propylene glycol,
triethylene glycol, 1,3-butanediol and glycerine; esters of
polyhydric alcohols, such as glycerine mono-, di- or triacetate;
and aliphatic esters of mono-, di- or polycarboxylic acids, such as
dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred
aerosol formers are polyhydric alcohols or mixtures thereof, such
as propylene glycol, triethylene glycol, 1,3-butanediol and, most
preferred, glycerine or glycerine. The aerosol generating substrate
may comprise a single aerosol former. Alternatively, the aerosol
generating substrate may comprise a combination of two or more
aerosol formers.
[0105] The aerosol generating substrate may have a high level of
aerosol former. As used herein, a high level of aerosol former
means aerosol former content that is greater than about 10% or
preferably greater than about 15% or more preferably greater than
about 20%, by weight. The aerosol generating substrate can also
have an aerosol former content of between about 10% and about 30%,
from about 15% and about 30%, or from about 20% and about 30%, by
weight. The aerosol generating substrate can also have a glycerine
content of between about 10% and about 30%, from about 15% and
about 30%, or from about 20% and about 30%, by weight.
[0106] The aerosol generating substrate may comprise at least about
1%, or at least about 2%, or at least about 5%, or at least about
7%, or at least about 10%, or at least about 12%, or at least about
15%, or at least about 18% aerosol former, by weight. The aerosol
generating substrate may comprise aerosol former in a range from
about 1 to about 20%, or about 5 to about 20%, or about 10 to about
20%, by weight.
[0107] The aerosol generating substrate may comprise at least about
1%, or at least about 2%, or at least about 5%, or at least about
7%, or at least about 10%, or at least about 12%, or at least about
15%, or at least about 18% glycerine, by weight. The aerosol
generating substrate may comprise glycerine in a range from about 1
to about 20%, or about 5 to about 20%, or about 10 to about 20%, by
weight.
[0108] Gel form aerosol generating substrates may have a majority
aerosol former, preferably glycerine. The gel composition may
include a gelling agent forming a solid medium, an aerosol former
such as glycerine dispersed in the solid medium, and nicotine
dispersed in the glycerine.
[0109] The composition forming a stable gel phase. The gel
composition may include at least two gelling agents forming a solid
medium, glycerine dispersed in the solid medium, and nicotine
dispersed in the glycerine. The composition forming a stable gel
phase. The gel composition may include a viscosifying agent, and
gelling agent forming a solid medium, glycerine dispersed in the
solid medium, and nicotine dispersed in the glycerine. The
composition forming a stable gel phase. A gel composition may
include nicotine, an aerosol former, a viscosifying agent, a
hydrogen-bond crosslinking gelling agent, and an ionic crosslinking
gelling agent. The gel composition may further include divalent
cations.
[0110] The gel composition may include a majority of aerosol former
such as glycerine. The gel composition may include a mixture of
water and the glycerine where the glycerine forms a majority (by
weight) of the gel composition. The glycerine may form at least
about 50% wt. of the gel composition. The glycerine may form at
least about 60% wt., or about 65% wt., or about 70% wt. of the gel
composition. The glycerine may form at about 70% wt. to about 80%
wt. of the gel composition. The glycerine may form at about 70% wt.
to about 75% wt. of the gel composition.
[0111] The wrapper, described herein, is disposed about an aerosol
generating substrate. The wrapper can reduce the absorption of
aerosol former compounds and water onto the wrapper as air is drawn
through the heated aerosol generating article.
[0112] Preferably, the aerosol generating article may be generally
cylindrical. This enables a smooth flow of the aerosol. The aerosol
generating article may have an outer diameter, for example, between
4 millimetres and 15 millimetres, between 5 millimetres and 10
millimetres, or between 6 millimetres and 8 millimetres. The
aerosol generating article may have a length, for example, between
10 millimetres and 60 millimetres, between 15 millimetres to 50
millimetres, or between 20 millimetres and 45 millimetres.
[0113] The resistance to draw (RTD) of the aerosol generating
article will vary depending on, among other things, the length and
dimensions of the passageways, the size of the apertures, the
dimensions of the most constricted cross-sectional area of the
internal passageway, and the materials used. The RTD of the aerosol
generating article may be between 50 millimetre of water (mm H2O)
and 140 millimetre of water (mm H2O), between 60 millimetre of
water (mm H2O) and 120 millimetre of water (mm H2O), or between 80
millimetre of water (mm H2O) and 100 millimetre of water (mm H2O).
The RTD of the article refers to the static pressure difference
between the one or more apertures and the mouth end of the article
when it is traversed by an inner longitudinal passageway under
steady conditions in which the volumetric flow is 17.5 millilitres
per second at the mouth end. The RTD of a specimen can be measured
using the method set out in ISO Standard 6565:2002.
[0114] All scientific and technical terms used herein have meanings
commonly used in the art unless otherwise specified. The
definitions provided herein are to facilitate understanding of
certain terms used frequently herein.
[0115] As used in this specification and the appended claims, the
singular forms "a", "an", and "the" encompass embodiments having
plural referents, unless the content clearly dictates
otherwise.
[0116] As used in this specification and the appended claims, the
term "or" is generally employed in its sense including "and/or"
unless the content clearly dictates otherwise.
[0117] As used herein, "have", "having", "include", "including",
"comprise", "comprising" or the like are used in their open ended
sense, and generally mean "including, but not limited to". It will
be understood that "consisting essentially of", "consisting of",
and the like are subsumed in "comprising," and the like.
[0118] The words "preferred" and "preferably" refer to embodiments
of the invention that may afford certain benefits under certain
circumstances. However, other embodiments may also be preferred
under the same or other circumstances. Furthermore, the recitation
of one or more preferred embodiments does not imply that other
embodiments are not useful, and is not intended to exclude other
embodiments from the scope of the disclosure, including the
claims.
[0119] FIG. 1 is a schematic cross-sectional diagram of an aerosol
generating article.
[0120] FIG. 2 is a schematic cross-sectional diagram of another
aerosol generating article.
[0121] FIG. 3 is a schematic cross-sectional diagram of another
aerosol generating article.
[0122] FIG. 4 is a schematic cross-sectional diagram of another
aerosol generating article.
[0123] FIG. 5 and FIG. 6 are schematic cross-sectional diagrams of
an aerosol generating system.
[0124] The aerosol generating articles depicted in FIGS. 1-4
illustrate one or more embodiments of aerosol generating articles
or components of aerosol generating articles described above. The
schematic drawings are not necessarily to scale and are presented
for purposes of illustration and not limitation. The drawings
depict one or more aspects described in this disclosure. However,
it will be understood that other aspects not depicted in the
drawings fall within the scope and spirit of this disclosure.
[0125] The aerosol generating article 10, of FIG. 1, illustrates an
aerosol-generating substrate 12 including a tobacco plug, a hollow
cellulose acetate tube 14, a polylactic acid filter segment 16 and
a mouthpiece segment 18 formed of cellulose acetate material. These
four elements are individually wrapped with a paper layer. In
particular, the aerosol-generating substrate 12 is wrapped with a
first paper layer 50, as described herein. These four elements are
arranged in end-to-end, longitudinal alignment.
[0126] The aerosol-generating substrate 12, hollow cellulose
acetate tube 14, a polylactic acid filter segment 16 are joined
together and circumscribed by a second paper layer 20 to form an
intermediate article. The mouthpiece segment 18 is joined to the
intermediate article with tipping paper 25 to form the aerosol
generating article 10. The first paper layer 50 and the second
paper layer 20 may cooperate to form the wrapper as described
herein.
[0127] The aerosol generating article 10 has a mouth end 22 and an
upstream, distal end 24 located at the opposite end of the article
to the mouth end 22. The aerosol generating article 10 shown in
FIG. 1 is particularly suitable for use with an electrically
operated aerosol generating device comprising a heater for heating
the aerosol-generating substrate 12.
[0128] The aerosol generating article 100, of FIG. 2, comprises
four elements arranged in coaxial alignment: at the distal end 103
an end plug 600 of high Resistance to Draw (RTD), a first paper
layer 500 which circumscribes an aerosol generating substrate 124,
a fluid guide 400 and a mouthpiece 170 at the proximal end 101.
These four elements are arranged sequentially and are circumscribed
by a second paper layer 110 to form the aerosol generating article
100. The aerosol generating article 100 has a proximal or mouth end
101, and a distal end 103 located at the opposite end of the
aerosol generating article 100 from the proximal end 101. The first
paper layer 500 and the second paper layer 110 cooperate to form
the wrapper, as described herein.
[0129] The aerosol generating article 100, of FIG. 3, illustrates,
a cut away view, of an example of an aerosol generating article 100
that is suitable for induction heating as well as for heating with
a blade like heating element.
[0130] The aerosol generating article 100 comprises a mouthpiece
170 at the proximal end 101, a fluid guide 400, a cavity 700, a
first paper layer 500 which circumscribes an aerosol generating
substrate 124 and an end plug 600 in the order proximal to distal.
In this example the aerosol generating substrate 124 comprises a
gel and a susceptor (not shown). The susceptor in this example is a
single aluminium strip centrally located along the longitudinal
axis of the aerosol generating substrate 124. On insertion of the
distal end 103 of the aerosol generating article 100 into an
aerosol generating device 200 (see FIG. 6) such that the portion of
the aerosol generating article 100 is positioned to be in proximity
to the induction heating elements 230 (see FIG. 5) of the aerosol
generating device 200 (see FIG. 6). Electromagnetic radiation
produced by the induction heating elements 230 is absorbed by the
susceptor and aid heating of the aerosol generating substrate 124
in the first paper layer 500, in turn aiding the release of
material from the aerosol generating substrate 124, for example
nicotine entrained into the passing aerosol when a negative
pressure is applied at the proximal end 101 of the aerosol
generating article 100. Fluid, for example air, enters the outer
longitudinal passageways 831 via apertures (not shown) to transfer
to the cavity 700 and then to the aerosol generating substrate 124
where the fluid mixes with the aerosol generating substrate 124 and
is entrained with nicotine before returning to the cavity and then
via the inner longitudinal passageway (not shown) of the fluid
guide 400 before exiting at the proximal end 101.
[0131] In this example a first paper layer 500 circumscribes an
aerosol generating substrate 124 and the first paper layer 500 is
circumscribed by a second paper layer 110. The first paper layer
500 and the second paper layer 110 form the wrapper, as described
herein. The aerosol generating substrate 124 may include a gel
composition.
[0132] This aerosol generating article 100 illustrated in FIG. 2
and FIG. 3 may be used with the aerosol generating device 200 as
illustrated in FIG. 5 and FIG. 6.
[0133] The aerosol generating article 10, of FIG. 4, illustrates an
aerosol-generating substrate 12, a hollow cellulose acetate tube
14, a hollow tubular segment 16 and a mouthpiece segment 18. The
aerosol-generating substrate 12 is wrapped with a first paper layer
50, as described herein. These four elements are arranged in
end-to-end, longitudinal alignment and are circumscribed by a
second paper layer 20 to form the aerosol-generating article 10.
The first paper layer 50 and the second paper layer 20 may
cooperate to form the wrapper as described herein.
[0134] The aerosol generating article 10 has a mouth end 22 and an
upstream, distal end 24 located at the opposite end of the article
to the mouth end 22. The aerosol generating article 10 shown in
FIG. 4 is particularly suitable for use with an electrically
operated aerosol generating device comprising a heater for heating
the aerosol-generating substrate 12.
[0135] The aerosol generating substrate 12 has a length of about 12
millimetres and a diameter of about 7 millimetres. The aerosol
generating substrate 12 is cylindrical in shape and has a
substantially circular cross-section. The aerosol generating
substrate 12 comprises a gathered sheet of homogenised tobacco
material. The sheet of homogenised tobacco material comprises 10
percent by weight on a dry basis of glycerine. The hollow cellulose
acetate tube 14 has a length of about 8 millimetres and a thickness
of 1 millimetre. The mouthpiece segment 18 comprises a plug of
cellulose acetate tow of 8 denier per filament and has a length of
about 7 millimetres.
[0136] The hollow tubular segment 14 is provided as a cylindrical
tube having a length of about 18 millimetres and a thickness of the
tube wall is about 100 micrometres. The aerosol generating article
10 comprises a ventilation zone 26 provided at about 5 millimetres
from an upstream end of the mouthpiece segment 18. Thus, the
ventilation zone 26 is at about 12 millimetres from the downstream
end of the aerosol generating article, and about 13 millimetres
from the upstream end of the hollow tubular segment. Thus, the
ventilation zone 26 is at about 21 millimetres from a downstream
end of the aerosol generating substrate 12.
[0137] FIGS. 5-6 illustrate an example of an aerosol generating
article 100 and aerosol generating device 200. The aerosol
generating article 100 has a proximal or mouth end 101 and a distal
end 103. In FIG. 5, the distal end 103 of the aerosol generating
article 100 is received in a receptacle 220 of the aerosol
generating device 200. The aerosol generating device 200 includes a
housing 210 defining the receptacle 220, which is configured to
receive the aerosol generating article 100. The aerosol generating
device 200 also includes a heating element 230 that forms a cavity
235 configured to receive the aerosol generating article 100,
preferably by interference fit. The heating element 230 may
comprise an electrically resistive heating component. In addition,
the device 200 includes a power supply 240 and control electronics
250 that cooperate to control heating of heating element 230.
[0138] The heating element 230 may heat the distal end 103 of the
aerosol generating article 100. In this example the aerosol
generating substrate 124 comprises a gel comprising nicotine.
Heating of the aerosol generating article 100 causes the aerosol
generating substrate 124 to generate an aerosol containing the
nicotine which can transfer out of the aerosol generating article
100 at the proximal end 101. The aerosol generating device 200
comprises a housing 210. FIGS. 5-6 do not show the exact heating
mechanism.
[0139] In some examples the heating mechanism could be by
conduction heating where the heat is transferred from the heating
element 230 of the aerosol generating device 200 to the aerosol
generating article 100. This can take place easily when the aerosol
generating article 100 is positioned in the receptacle 220 of the
aerosol generating device 200 and the distal end 103 (which is
preferably the end where the aerosol generating substrate 124 is
located) and thus the aerosol generating article 100 is in contact
with the heating element 230 of the aerosol generating device 200.
In specific examples the heating element comprises a heating blade
that protrudes from the aerosol generating device 200 and is
suitable for penetrating into the aerosol generating article 100 to
make direct contact with the aerosol generating substrate 124.
[0140] In this example the heating mechanism is by induction where
the heating element emits radio-magnetic radiation which is
absorbed by the tubular element when the aerosol generating article
100 is position in the receptacle 220 of the aerosol generating
device 200.
[0141] Once the aerosol generating article 100 is releasably
received in the aerosol generating device 200 and on the heating
element 230, the aerosol generating device 200 is actuated to heat
the aerosol generating substrate 124 to a temperature of
approximately 375 degrees Celsius. As a user draws on the mouth end
101 of the aerosol generating article 100, the volatile compounds
evolved from the aerosol generating substrate 124 are drawn
downstream through the aerosol generating article 100 and condense
to form an aerosol that is drawn through the mouthpiece 101 of the
aerosol generating article 100 into the user's mouth. The wrapper
500, 110 repels aerosol former and moisture from the aerosol to
reduce staining and weakening of the wrapper 500, 110.
[0142] The first paper layer 50, 500 has a negative result for at
least one kit oil sample of method Tappi 559 cm-02 classical method
2002. Preferably the first paper layer 50, 500 has a negative
result for at least five kit oil samples of method Tappi 559 cm-02
classical method 2002. Preferably the paper layer 50, 500 has a
negative result for all ten kit oil samples of method Tappi 559
cm-02 classical method 2002.
[0143] Preferably, the first paper layer 50, 500 has a
thickness/grammage of about 1.2 micrometers/gsm or less and a water
contact angle of at least about 30 degrees. The first paper layer
50, 500 may have a thickness of less than about 50 micrometers, or
less than about 40 micrometers. The first paper layer 50, 500 may
have a grammage in a range from about 25 gsm to about 45 gsm, or
from about 35 gsm to about 40 gsm.
[0144] Preferably, the first paper layer 50, 500 has a water
contact angle of at least about 30 degrees and an elongation to
break ratio CD/MD of about 2.5 or less. The first paper layer 50,
500 may have an elongation to break ratio CD/MD of about 2.2 or
less, or about 2 or less.
[0145] Preferably, the first paper layer 50, 500 has an elongation
at break ratio of CD/MD is about 2.5 or less and a negative result
for at least one kit oil sample of method Tappi 559 cm-02 classical
method 2002. The first paper layer 50, 500 may have a negative
result for at least five kit oil samples, or all ten kit oil
samples of method Tappi 559 cm-02 classical method 2002.
[0146] Preferably, the wrapper includes the first paper layer 50,
500 and the second paper layer 20, 110 wherein a first paper layer
50, 500 has a negative result for at least one kit oil sample of
method Tappi 559 cm-02 classical method 2002, or a negative result
for at least five kit oil samples of method Tappi 559 cm-02
classical method 2002, or a negative result for all ten kit oil
samples of method Tappi 559 cm-02 classical method 2002.
[0147] Preferably, the wrapper includes the first paper layer 50,
500 and the second paper layer 20, 110 wherein a first paper layer
50, 500 has a negative result for at least one kit oil sample of
method Tappi 559 cm-02 classical method 2002, and the wrapper may
has a total thickness of less than about 80 micrometers.
[0148] Preferably, the first paper layer 50, 500 comprises PVOH
(polyvinyl alcohol) or silicon. The first paper layer 50, 500 may
comprise a surface treatment comprising PVOH or silicon. Addition
of PVOH (polyvinyl alcohol) or silicon may improve the grease
barrier properties of the wrapper.
[0149] Preferably the second paper layer 20, 110 comprises PVOH
(polyvinyl alcohol) or silicon. The second paper layer 20, 110 may
comprise a surface treatment comprising PVOH or silicon. Addition
of PVOH (polyvinyl alcohol) or silicon may improve the grease
barrier properties of the wrapper.
[0150] The exemplary embodiments described above are not limiting.
Other embodiments consistent with the exemplary embodiments
described above will be apparent to those skilled in the art.
* * * * *