U.S. patent application number 16/766435 was filed with the patent office on 2021-01-28 for smoking article.
The applicant listed for this patent is NICOVENTURES TRADING LIMITED. Invention is credited to William ENGLAND.
Application Number | 20210022390 16/766435 |
Document ID | / |
Family ID | 1000005149341 |
Filed Date | 2021-01-28 |
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United States Patent
Application |
20210022390 |
Kind Code |
A1 |
ENGLAND; William |
January 28, 2021 |
SMOKING ARTICLE
Abstract
Described herein is a wrapper for wrapping an aerosolizable
material, the wrapper including at least three layers, wherein the
peripheral layers comprise paper and an intermediate layer
comprises a non-combustible material, and wherein at least the
intermediate layer and one of the peripheral layers are provided as
a laminate structure.
Inventors: |
ENGLAND; William; (London,
GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NICOVENTURES TRADING LIMITED |
LONDON |
|
GB |
|
|
Family ID: |
1000005149341 |
Appl. No.: |
16/766435 |
Filed: |
November 15, 2018 |
PCT Filed: |
November 15, 2018 |
PCT NO: |
PCT/EP2018/081395 |
371 Date: |
May 22, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24B 3/14 20130101; A24D
1/02 20130101; A24F 40/20 20200101; A24D 3/17 20200101 |
International
Class: |
A24D 1/02 20060101
A24D001/02; A24D 3/17 20060101 A24D003/17 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 24, 2017 |
GB |
1719521.5 |
Claims
1. A wrapper for wrapping an aerosolizable material, the wrapper
comprising: at least three layers, wherein peripheral layers
comprise paper and an intermediate layer comprises a
non-combustible material, and wherein at least the intermediate
layer and one of the peripheral layers are provided as a laminate
structure.
2. The wrapper according to claim 1, wherein the laminate structure
comprises each of the peripheral layers and the intermediate
layer.
3. The wrapper according to claim 1, wherein the laminate structure
comprises the intermediate layer and the peripheral layer which is
disposed adjacent to the aerosolizable material in use.
4. The wrapper according to claim 1, wherein the non-combustible
material comprises a metal foil.
5. The wrapper according to claim 4, wherein the metal foil
comprises aluminum.
6. The wrapper according to claim 1, wherein the wrapper consists
of three layers.
7. An aerosol generating article, the aerosol generating article
comprising an aerosolizable material and the wrapper according to
claim 1 wrapped around the aerosolizable material.
8. The aerosol generating article according to claim 7, wherein the
aerosolizable material comprises tobacco.
9. The aerosol generating article according to claim 7, wherein the
aerosolizable material is a rod of aerosolizable material, and the
wrapper circumscribes at least an end of the rod that is distant
from a mouth of a user in use.
10. The aerosol generating article according to claim 9, wherein
the wrapper circumscribes at least the rod over at least 25% of a
length of the rod.
11. The aerosol generating article according to claim 7, further
comprising at least one of a filter or a cooling element.
12. The aerosol generating article according to claim 11, wherein
the aerosol generating article comprises the filter and the cooling
element, and wherein the cooling element is arranged between the
aerosolizable material and the filter.
13. An aerosol generating assembly comprising the aerosol
generating article according to claim 7 and a heater.
14. The aerosol generating assembly according to claim 13, wherein
the aerosol generating assembly is a tobacco heating product.
15. The aerosol generating assembly according to claim 13, wherein
the heater is a device into which the aerosol generating article is
at least partially inserted in use.
16. A system comprising an aerosol generating device and the
aerosol generating article according to claim 7.
17. A process for making an aerosol generating article comprising
wrapping an aerosolizable material in the wrapper according to
claim 1.
18. A method of preventing a user lighting or igniting an
aerosolizable material in an aerosol generating article, the method
comprising wrapping an aerosolizable material in the wrapper
according to claim 1.
Description
PRIORITY CLAIM
[0001] The present application is a National Phase entry of PCT
Application No. PCT/EP2018/081395, filed Nov. 15, 2018, which
claims priority from GB Patent Application No. 1719521.5, filed
Nov. 24, 2017, each of which is hereby fully incorporated herein by
reference.
TECHNICAL FIELD
[0002] The present disclosure relates to smoking articles and
specifically, although not exclusively, to a wrapper for an
aerosolizable material, an aerosol generating article comprising a
wrapped aerosolizable material, and an aerosol generating assembly
containing an aerosol generating article, the aerosol generating
article comprising a wrapped aerosolizable material.
BACKGROUND
[0003] Smoking articles such as cigarettes, cigars and the like
burn tobacco during use to create tobacco smoke. Alternatives to
these types of articles, release compounds by heating without
burning an aerosolizable material.
[0004] Apparatus is known that heats aerosolizable material to
volatilize at least one component of the aerosolizable material,
typically to form an aerosol which can be inhaled, without burning
or combusting the aerosolizable material. Such apparatus is
sometimes described as a "heat-not-burn" apparatus or a "tobacco
heating product" (THP) or a "tobacco heating device" or similar.
Various different arrangements for volatilizing at least one
component of the aerosolizable material are known.
[0005] The material may be for example tobacco, other non-tobacco
products or a combination, such as a blended mix, which may or may
not contain nicotine.
SUMMARY
[0006] A first aspect of the disclosure provides a wrapper for
wrapping an aerosolizable material, the wrapper comprising at least
three layers, wherein the peripheral layers comprise paper and an
intermediate layer comprises a non-combustible material, and
wherein at least the intermediate layer and one of the peripheral
layers are provided as a laminate structure.
[0007] The peripheral layers may be referred to herein as the
"innermost" and "outermost" layers. This refers to their location
when the material is wrapped around an aerosolizable material.
[0008] In one example, the laminate structure may comprise the
intermediate layer and the peripheral layer which is disposed
adjacent to the aerosolizable material in use (i.e. the innermost
layer). This may then be circumscribed or wrapped by one or more
further layers, wherein the peripheral layer of the composite
structure comprises paper (i.e. the outermost layer).
[0009] In another example, the laminate structure comprises each of
the peripheral layers and the intermediate layer.
[0010] In some cases, the non-combustible material comprises a
metal foil. In some cases, the metal foil comprises aluminum .
[0011] In some examples, the wrapper comprises more than three
layers. In some cases, the wrapper consists of three layers. In
some cases, the wrapper may consist of a three layer laminate
structure comprising the peripheral layers and the intermediate
layer.
[0012] A second aspect of the disclosure provides an aerosol
generating article, the aerosol generating article comprising an
aerosolizable material and a wrapper according to the first aspect
of the disclosure wrapped around the aerosolizable material.
[0013] In some examples, the aerosolizable material comprises
tobacco.
[0014] In some examples, the aerosolizable material is a rod of
aerosolizable material and the wrapper circumscribes at least the
end of the rod that is distant from the user's mouth in use. In
some cases, the wrapper circumscribes at least the rod over at
least 25% of the rod length.
[0015] In some examples, the aerosol generating article may
additionally a filter and/or a cooling element. In some cases, the
cooling element may be arranged between the aerosolizable material
and the filter. In some cases, the filter may be arranged between
the aerosolizable material and the cooling element.
[0016] A further aspect of the disclosure provides an aerosol
generating assembly, the assembly comprising a heater and an
aerosol generating article according to the second aspect. In some
cases, the aerosol generating assembly may be a tobacco heating
product (also known as a heat not burn device).
[0017] A further aspect of the disclosure provides a system
comprising an aerosol generating device and an aerosol generating
article according to the second aspect.
[0018] A further aspect of the disclosure provides a process for
making an aerosol generating article comprising wrapping an
aerosolizable material in a wrapper according to the first
aspect.
[0019] A further aspect of the disclosure provides a method of
preventing a user igniting or burning an aerosolizable material in
an aerosol generating article, the method comprising wrapping an
aerosolizable material in a wrapper according to the first
aspect.
[0020] To the extent that they are compatible, features of the
disclosure described in the context of one aspect as explicitly
disclosed in combination with each other aspect.
BRIEF DESCRIPTION OF THE FIGURES
[0021] Further features and advantages of the disclosure will
become apparent from the following figures description of examples
of the invention, given by way of example only and do not place any
limitation on the scope of the claims.
[0022] FIG. 1 is a schematic diagram of a side view of an aerosol
generating article according to an example of the disclosure.
[0023] FIG. 2 is a schematic diagram of a first end view of an
aerosol generating article according to an example of the
disclosure.
[0024] FIG. 3 is a schematic diagram of a first end view of a
different aerosol generating article according to an example of the
disclosure.
[0025] FIG. 4 is a schematic diagram of a side view of an aerosol
generating article according to an example of the disclosure.
[0026] FIG. 5 is an exploded schematic diagram of a wrapper
according to an example of the disclosure.
[0027] FIG. 6 is an exploded schematic diagram of a wrapper
according to another example of the disclosure.
DETAILED DESCRIPTION
[0028] As used herein, the term "laminate structure" refers to a
multi-layer structure in which the layers are fastened together to
form a single body. The layers may be fastened with an adhesive,
for example. In other examples, the layers may be fastened by
static interaction. In other examples, the laminate structure might
be formed by (partially) melting a first layer, contacting the
first layer with a second layer and allowing the first layer to
solidify. Any suitable mechanism for fastening the layers together
including, but not limited to, the above examples, tying, sewing,
screwing, nailing, bolting, hooking etc. may be employed to form
the laminate structure.
[0029] In some cases, an adhesive may coat the surface of each
layer. In other cases, an adhesive may be applied only to the
periphery of the layers. In some cases, each layer in the laminate
structure may be fastened to the adjacent layer(s). In some example
laminate structures, the periphery of two layers may be fastened
together with intermediate layers trapped in-between.
[0030] In one example of the wrapper, the laminate structure may
comprise the intermediate layer and the peripheral layer which is
disposed adjacent to the aerosolizable material in use (i.e. the
innermost layer). This may then be circumscribed or wrapped by one
or more further layers, wherein the peripheral layer of the
composite structure comprises paper (i.e. the outermost layer).
FIG. 6 is a schematic illustration of such an example. The laminate
structure (indicated by dotted lines) includes a peripheral layer
501 and the intermediate layer 502. The wrapper additionally
comprises peripheral layer 503, although this is not part of the
laminate structure.
[0031] In another example, the laminate structure comprises each of
the peripheral layers and the intermediate layer. That is, in one
example, the laminate wrapper for wrapping an aerosolizable
material comprises at least three layers, wherein the peripheral
(i.e. the innermost and outermost) layers comprise paper and an
intermediate layer comprises a non-combustible material. FIG. 5 is
a schematic illustration of such an example. The laminate structure
(indicated by dotted lines) includes the peripheral layers 501, 503
and the intermediate layer 502.
[0032] In some cases, the non-combustible material comprises a
metal foil. In some cases, it may consist essentially of or consist
of a metal foil. Suitably, the metal foil may comprise, essentially
consist of or consist of an aluminum foil. The metal foil is a
non-combustible material that can nevertheless act to conduct heat
to the aerosolizable material in use.
[0033] In some cases, the metal foil may be less than about
100.mu.m, 50.mu.m, 20.mu.m, 10.mu.m or 8.mu.m thick. In some cases,
it may be more than about 1.mu.m, 3.mu.m or 5.mu.m thick.
[0034] In some cases, the wrapper may be a laminate wrapping
material that consists of three layers (i.e. only the innermost and
outermost layers comprising paper and the intermediate
non-combustible layer). In some cases, the wrapper may consist of a
three layer laminate structure comprising the peripheral layers and
the intermediate layer.
[0035] In some cases, the innermost and outermost layers of the
wrapper are tobacco wrapping paper.
[0036] A consideration when preparing aerosol generating articles
such as tobacco heating products is that they should not produce an
acceptable smoking experience if combusted, so that the user is not
minded to burn the aerosol generating article. This is because the
formulation of the aerosolizable material is not configured for
combustion (and the aerosol that results from combustion may be
less suitable for inhalation than the aerosol that results from
heating but not burning that aerosolizable material, or than the
aerosol which results from combustion of traditional
cigarettes).
[0037] The use of a non-combustible layer in the wrapper prevents
the aerosol generating article from being burned and smoked as a
conventional combustible cigarette.
[0038] As used herein, the phrase "non-combustible" refers to a
material that will not ignite or burn at temperatures normally
associated with lighting (igniting) or burning of tobacco.
[0039] Further, the use of a metal foil layer results in a wrapper
that has a low porosity, reducing side stream air flow to the
aerosolizable material. This further reduces the propensity to burn
through limiting the oxygen levels at the aerosolizable
material.
[0040] Moreover, the inventors established that having paper in the
innermost and outermost layers of a laminate wrapper may be
beneficial because the laminate surfaces then have a coefficient of
friction of that paper. This means that the laminate wrapper can be
more readily used in known cigarette manufacturing processes and
machines. The laminate surfaces having a coefficient of friction
equivalent to that of a cigarette paper allows the garniture belt
of an aerosol generating article making machine to drive the
laminate wrapper through the garniture during the aerosol
generating article manufacturing process.
[0041] In some cases, the innermost layer may also comprise a
flavorant, which is transferred to the aerosolizable material when
wrapped around the aerosolizable material and heated. In some
cases, the flavorant is impregnated into paper in the innermost
layer. In some cases, the flavorant may comprise menthol.
[0042] The inventors established that having paper in the innermost
layer of the laminate material may be beneficial because it can act
as a flavor carrier.
[0043] In some cases, the paper in either or each of the innermost
and outermost layers of the laminate may have a basis weight of at
least about 10 g.m.sup.-2, 15 g.m.sup.-2, 20 g.m.sup.-2 or 25
g.m.sup.-2 to about 50 g.m.sup.-2, 45 g.m.sup.-2, 40 g.m.sup.-2 or
35 g.m.sup.-2. Paper having a density in this range has a low
porosity, which further reduces the propensity to burn through
limiting the oxygen levels at the aerosolizable material.
[0044] In some cases, the paper in either or each of the innermost
and outermost layers of the wrapper may be treated with one or more
burn-retardant substances.
[0045] In one example, the wrapper is a laminate structure that
consists of: [0046] (a) a middle layer of aluminum foil, which is
1.0-7.mu.m, suitably 6.0-6.3.mu.m thick; and [0047] (b) two layers
of paper either side of the foil. The paper layers each have a
basis weight of 25-35 g.m.sup.-2.
[0048] In one example, the wrapper comprises a laminate structure
that consists of: [0049] (a) a layer of paper which has a basis
weight of 25-35 g.m.sup.-2 and is arranged adjacent to the
aerosolizable material when wrapped; and [0050] (b) a layer of
aluminum foil, which is 1.0-7.mu.m suitably 6.0-6.3.mu.m thick.
[0051] In this example, the wrapper additionally comprises a second
paper layer which is wrapped over the laminate in use, the second
paper layer having a basis weight of 25-35 g.m.sup.-2.
[0052] In some cases, the laminate material can be wound onto a
bobbin core for use with standard cigarette makers that are fed
from a single paper bobbin.
[0053] In some cases, one or more ventilation apertures may be
formed in the wrapper. The ventilation apertures may provide
airflow into the aerosol-generating article during use, the air
forming part of the inhaled aerosol.
[0054] The laminate structure may be formed using any suitable
lamination technique. In one example, the layers may be adhered
together.
[0055] In some examples of the aerosol generating article described
herein, at least part of the innermost layer is disposed in contact
with the aerosolizable material.
[0056] In some cases, the aerosolizable material comprises tobacco.
The tobacco may be any suitable solid tobacco, such as single
grades or blends, cut rag or whole leaf, ground tobacco, tobacco
fiber, cut tobacco, extruded tobacco, tobacco stem and/or
reconstituted tobacco. The tobacco may be of any type including,
but not limited to, Virginia and/or Burley and/or Oriental
tobacco.
[0057] In some examples, the aerosolizable material may be a rod of
aerosolizable material. As used herein, the term "rod" generally
refers to an elongate body which may be any suitable shape for use
in an aerosol generating assembly. In some cases, the rod is
substantially cylindrical.
[0058] In some cases where the aerosolizable material is a rod of
aerosolizable material, the wrapper circumscribes at least the end
of the rod that is distant from the user's mouth in use (i.e. a
distal-end rather than a mouth-end). This ensures that the
non-combustible wrapper is disposed around the end of the rod which
the user might try to ignite. In some cases, the laminate wrapper
circumscribes the rod over at least 25% of the rod length. In some
cases, the wrapper extends over at least 35%, 40%, 45% or 50% of
the rod length. As more of the rod is circumscribed, burning of the
rod is more difficult.
[0059] In some cases, the wrapper does not extend over the entire
length of the rod of aerosolizable material, resulting in cost
savings. In some cases, the laminate wrapper extends over less than
about 85%, 80%, 75%, 70%, 65% or 60% of the rod length.
[0060] FIG. 1 illustrates an example aerosol generating article.
The aerosol generating article 101 includes an aerosolizable
material 103 which is wrapped by a wrapper 102. In this example,
this wrapper extends from the distal-end of the aerosolizable
material over approximately 50% of the distance to the mouth-end of
the aerosolizable material. In some examples, the wrapper 102
comprises three layers, wherein the peripheral layers comprise
paper and an intermediate layer comprises a non-combustible
material. In some examples, one peripheral layer and the
intermediate layer are provided as a laminate structure (see FIG.
6). In other examples, both peripheral layers and the intermediate
layer are provided as a laminate structure (see FIG. 5).
[0061] Optionally, the wrapper may also be arranged over the
distal-end of the aerosolizable material, so that the distal-end is
completely enclosed in the wrapper. FIG. 2 illustrates an example
in which the wrapper 102 is wrapped around the circumference of the
aerosolizable material 103. The distal-end of the aerosol
generating article 101 is not covered by the wrapper. FIG. 3
illustrates an alternative example of an aerosol generating article
101 in which the wrapper 102 completely encloses the distal-end of
the aerosol generating article.
[0062] Examples of the aerosol generating article may additionally
comprise a filter and/or a cooling element. In some cases, these
additional components may not be circumscribed by all layers of the
wrapper; instead, they may be circumscribed by a single layer of
the wrapper which extends over a greater proportion of the
aerosolizable material than the other layers. Suitably, the
additional components may be circumscribed by only the outermost
peripheral layer of the wrapper (which also circumscribes the
aerosolizable material) or alternatively, by only the innermost
peripheral layer of the wrapper.
[0063] For example, the mouth-end of the aerosolizable material may
be provided adjacent to one or more of a cooling element and a
filter. A cooling element, if present, allows vapor components to
condense to form an aerosol and/or spaces the very hot parts of the
apparatus from the user. A filter, if present, may remove
components from the fluid flow, affecting the chemical composition
of the inhaled aerosol.
[0064] FIG. 4 illustrates an example of an aerosol generating
article 101 which includes, in addition to the features of FIG. 1,
a cooling element 104, a filter 105 and a mouth-end tube 106. The
cooling element 104 and filter 105, as illustrated, may be arranged
between the mouth-end of the aerosolizable material 103 and the
mouth-end tube 106, so that flow from the aerosolizable material
103 passes through the cooling element 104 and filter 105 (or vice
versa if the filter is arranged before the cooling element in the
flow) before reaching the user. Although the example in FIG. 4
illustrates a cooling element 104, a filter 105 and a mouth-end
tube 106, one or more of these elements may be omitted in other
examples.
[0065] In some examples, the mouth-end tube, if present, 106 may be
formed of for example paper, for example in the form of a spirally
wound paper tube, cellulose acetate, cardboard, crimped paper, such
as crimped heat resistant paper or crimped parchment paper, and/or
polymeric materials, such as low density polyethylene (LDPE), or
some other suitable material. The mouth-end tube 106 may be a
hollow tube. Such a hollow tube may provide a filtering function to
filter volatilized aerosolizable material. The mouth-end tube 106
may be elongate, in order to be spaced from the very hot part(s) of
the main apparatus (not shown) that heats the aerosolizable
material.
[0066] In some examples, the filter 105, if present, may be a
filter plug, and may be made, for example, from cellulose
acetate.
[0067] In some cases, the cooling element 104, if present, may
comprise a monolithic rod having first and second ends and
comprising plural through holes extending between the first and
second ends. The through holes may extend substantially parallel to
the central longitudinal axis of the rod. The through holes of the
cooling element 104 may be arranged generally radially of the
element when viewed in lateral cross-section. That is, in an
example, the element has internal walls which define the through
holes and which have two main configurations, namely radial walls
and central walls. The radial walls extend along radii of the
cross-section of the element and the central walls are centered on
the center of the cross-section of the element. The central walls
in one example are circular, though other regular or irregular
cross-sectional shapes may be used. Likewise, the cross-section of
the element in one example is circular, though other regular or
irregular cross-sectional shapes may be used.
[0068] In an example, the majority of the through holes have a
hexagonal or generally hexagonal cross-sectional shape. In this
example, the element has what might be termed a "honeycomb"
structure when viewed from one end.
[0069] In some cases, the cooling element 104 may comprise a hollow
tube which spaces the filter 105, if present, from the very hot
part(s) of the main apparatus that heats the aerosolizable
material. The cooling element 104 may be formed of for example
paper, for example in the form of a spirally wound paper tube,
cellulose acetate, cardboard, crimped paper, such as crimped heat
resistant paper or crimped parchment paper, and polymeric
materials, such as low density polyethylene (LDPE), or some other
suitable material.
[0070] The cooling element 104, if present, may be substantially
incompressible. It may be formed of a ceramic material, or of a
polymer, for example a thermoplastic polymer, which may be an
extrudable plastics material. In an example, the porosity of the
element is in the range 60% to 75%. The porosity in this sense may
be a measure of the percentage of the lateral cross-sectional area
of the element occupied by the through holes. In an example, the
porosity of the element is around 69% to 70%.
[0071] Other examples of aerosol-cooling element are disclosed in
PCT/GB2015/051253, the entirety of which is hereby expressly
incorporated by reference, in particular in FIGS. 1 to 8 and the
description from page 8, line 11 to page 18, line 16.
[0072] In further examples, the cooling element 104 may be formed
from a sheet material that is folded, crimped or pleated to form
through holes. The sheet material may be made, for example, from
metal such as aluminum; polymeric plastics material such as
polyethylene, polypropylene, polyethylene terephthalate, or
polyvinyl chloride; or paper.
[0073] In some examples, the cooling element 104 and the filter 105
may be held together by a wrapper paper to form an assembly. The
assembly may then be joined to the aerosolizable material by a
further wrapper which circumscribes the assembly and at least the
mouth end of the aerosolizable material to form the aerosol
generating article 101. In other examples, the aerosol generating
article 101 is formed by wrapping the cooling element 104, the
filter 105 and the aerosolizable material 103 effectively in one
operation, with no separate tipping paper being provided for the
cooling element and/or filter components (if present).
[0074] In some cases, one or more ventilation apertures may be
formed in the aerosol-generating article. The ventilation apertures
may provide airflow into the article during use which forms part of
the inhaled aerosol. It may be desirable to reduce airflow over the
distal-end of the article to reduce the propensity to burn, and so
the apertures may be formed nearer to the mouth-end of the article
than to the distal-end. For example, the ventilation apertures may
be formed in the cooling element and/or filter, if present.
Moreover, the ventilation holes may be formed in a part of the
article that is not wrapped in the non-combustible material. The
inventors have established that cutting the non-combustible
material to form ventilation apertures may not be
straightforward.
[0075] In use, in some cases, the aerosol generating article may be
arranged at least partially within a heating device to form an
aerosol generating assembly which heats the article to generate an
aerosol without burning. In some other cases, the article may be
provided in an assembly with a fuel source, such as a combustible
fuel source or chemical heat source, which heats but does not burn
the aerosolizable material.
[0076] The above examples are to be understood as illustrative
examples of the disclosure. It is to be understood that any feature
described in relation to any one example may be used alone, or in
combination with other features described, and may also be used in
combination with one or more features of any other of the examples,
or any combination of any other of the examples. Furthermore,
equivalents and modifications not described above may also be
employed without departing from the scope of the invention, which
is defined in the accompanying claims.
* * * * *