U.S. patent application number 17/011409 was filed with the patent office on 2021-02-18 for filter for a smoking article.
The applicant listed for this patent is British American Tobacco (Investments) Limited. Invention is credited to Matthew Knight, Santiago Morales, Lance Mucalo, John Richardson, Nicholas Walpole, Peter Wan.
Application Number | 20210045436 17/011409 |
Document ID | / |
Family ID | 1000005181011 |
Filed Date | 2021-02-18 |
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United States Patent
Application |
20210045436 |
Kind Code |
A1 |
Mucalo; Lance ; et
al. |
February 18, 2021 |
FILTER FOR A SMOKING ARTICLE
Abstract
A filter for a smoking article has a first filter section
comprising a filter material and a smoke modifying additive
disposed in an axial region thereof and a second filter section
connected to the first filter section and having at least one
channel located in an axial region thereof for directing smoke, in
use, through the axial region of the first filter section. The
smoke modifying additive can comprise a flavourant such as menthol
and the second filter section can comprise a tubular section of
fibrous filter material. An adsorbent filter section can also be
provided.
Inventors: |
Mucalo; Lance; (London,
GB) ; Walpole; Nicholas; (London, GB) ;
Knight; Matthew; (London, GB) ; Richardson; John;
(London, GB) ; Morales; Santiago; (London, GB)
; Wan; Peter; (London, GB) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
British American Tobacco (Investments) Limited |
London |
|
GB |
|
|
Family ID: |
1000005181011 |
Appl. No.: |
17/011409 |
Filed: |
September 3, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14440040 |
Apr 30, 2015 |
|
|
|
PCT/GB2013/052813 |
Oct 29, 2013 |
|
|
|
17011409 |
|
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|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24D 1/02 20130101; A24D
3/04 20130101; A24D 1/002 20130101; A24D 3/048 20130101; A24D 3/061
20130101 |
International
Class: |
A24D 3/06 20060101
A24D003/06; A24D 1/00 20060101 A24D001/00; A24D 3/04 20060101
A24D003/04; A24D 1/02 20060101 A24D001/02 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 31, 2012 |
GB |
1219540.0 |
Claims
1-33. (canceled)
34. A smoking article in the form of a heat-not-burn product
capable of generating an aerosol for delivery to a consumer, the
heat-not-burn product comprising a filter, the filter comprising: a
first discrete filter section comprising continuous filter material
and an aerosol modifying additive disposed in an axial region of
said filter material, wherein the aerosol modifying additive is
disposed only in said axial region of the first filter section or
in a greater concentration in said axial region than in non-axial
regions of the first filter section, and wherein the aerosol
modifying additive is disposed on a thread formed from cellulose
acetate fibres; and a second discrete filter section connected to
said first filter section, the second filter section comprising at
least one channel located in an axial region thereof, for directing
aerosol, in use, through the axial region of the first filter
section in which the thread is disposed, wherein the second filter
section is connected to said first filter section so as to make the
second filter section immediately upstream of said first filter
section when incorporated into the smoking article, and wherein the
second filter section comprises a tubular filter section comprising
a wall thickness of from 1 mm to 3 mm and wherein the channel
comprises a hollow passageway through the second filter section
having a diameter of from 2 mm to 5 mm.
35. A smoking article according to claim 33, wherein the tubular
filter section is formed from a fibrous filter material.
36. A smoking article according to claim 34, wherein the tubular
filter section is formed from cellulose acetate tow.
37. A smoking article according to claim 33, wherein the at least
one channel has a lower resistance to aerosol passing through it
than other regions of the second filter section.
38. A smoking article according to claim 33, wherein said axial
region of at least one of said first filter section and said second
filter section has a radius of from 1 mm to 3 mm and is centred on
the axis of the smoking article.
39. A smoking article according to claim 38, wherein said axial
region of at least one of said first filter section and said filter
section has a radius of about 2.5 mm.
40. A smoking article according to claim 34, wherein the first
filter section is wrapped in a first plug wrap and the second
filter section is wrapped in a second plug wrap.
41. A smoking article according to claim 34, wherein the aerosol
modifying additive comprises menthol.
42. A smoking article according to claim 34, wherein the aerosol
modifying additive comprises a flavourant having a loading level of
between 0.1 mg and 10 mg.
43. A smoking article according to claim 42, wherein the aerosol
modifying additive comprises a flavourant having a loading level of
between 0.2 mg and 2 mg.
44. A smoking article according to claim 34, further comprising a
third discrete filter section connected to said second filter
section so as to make the third filter section upstream of said
second filter section when incorporated into a smoking article.
45. A smoking article according to claim 44, wherein the third
filter section comprises fibrous filter material and a granular
adsorbent material.
46. A smoking article according to claim 45, wherein the granular
adsorbent material is disposed in a circumferential region of the
third filter section, dispersed within the filter material of the
third filter section, or comprises some granular adsorbent material
disposed in a circumferential region of the third filter section
and some granular adsorbent material dispersed within the third
filter section.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of Ser. No. 14/440,040
filed Apr. 30, 2015, which is a national stage application of
PCT/GB2013/052813 filed Oct. 29, 2013, the disclosure of which is
incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] The invention relates to a filter for a smoking article and
to a smoking article including a filter.
BACKGROUND
[0003] Known smoking article filters, such as cigarette filters,
generally comprise a continuous tow of filamentary cellulose
acetate. The cellulose acetate is gathered together to form a rod
which is cut to form individual filter sections. The smoking
article filter may be made of one segment of filter rod, or may be
made from multiple segments, with or without a cavity or spaces
between them.
SUMMARY
[0004] According to embodiments of the invention, there is provided
a filter for a smoking article comprising a first filter section
comprising filter material and a smoke modifying additive disposed
in an axial region thereof and a second filter section connected to
said first filter section, the second filter section comprising
filter material and at least one channel located in an axial region
thereof for directing smoke, in use, through the axial region of
the first filter section in which the smoke modifying additive is
disposed. The first and second filter sections can be discrete
filter sections and/or the smoke modifying additive can be disposed
only in said axial region of the filter material of the first
filter section or in a greater concentration in said axial region
than in non-axial regions of the filter material of the first
filter section.
[0005] The at least one channel can have a lower resistance to
smoke passing through it than other regions of the filter material
of the first filter section. The channel can be a hollow passageway
through the second filter section.
[0006] The second filter section can be connected to said first
filter section so as to make the second filter section immediately
either downstream or upstream of said first filter section when
incorporated into a smoking article.
[0007] The axial region of said filter material of said first
and/or second filter sections can have a radius of from 1 mm to 4
mm and/or can be centred on the axis of the smoking article.
[0008] The first filter section can comprise continuous filter
material having the smoke modifying additive disposed in the axial
region thereof. The second filter section can comprise a tubular
filter section. The tubular filter section can be formed from a
fibrous filter material.
[0009] The smoke modifying additive can be disposed in a greater
concentration in said axial region than in non-axial regions of the
filter material of the first filter section.
[0010] The smoke modifying additive can be disposed only in said
axial region of the filter material of the first filter
section.
[0011] The second filter section can be configured, in use, to
direct a greater portion of smoke through the axial region of the
first filter section than through non-axial regions of the first
filter section.
[0012] The smoke modifying additive can comprise an encapsulated
additive. The smoke modifying additive can be contained within a
capsule which is located within the first filter section at a
position other than a longitudinally central position within the
first filter section.
[0013] The capsule can be located within the first filter section
at a position from 1 mm to 10 mm from a longitudinally central
position within the first filter section.
[0014] The smoke modifying additive can be disposed on a carrier
material. The carrier material can comprise a thread.
[0015] The filter can further comprise a third filter section
connected to said first filter section so as to make it upstream of
said first filter section when incorporated into a smoking article.
The third filter section can be a discrete filter section. The
third filter section can comprise fibrous filter material and a
granular adsorbent material. The granular adsorbent material can be
disposed in a circumferential region of the third filter section,
dispersed within the filter material of the third filter section,
or comprises some granular adsorbent material disposed in a
circumferential region of the third filter section and some
granular adsorbent material dispersed within the third filter
section.
[0016] According to embodiments of the invention, there is also
provided a smoking article comprising a filter as defined
above.
[0017] The second filter section can be arranged immediately
downstream of said first filter section and at the mouth-end of the
smoking article.
[0018] According to embodiments of the invention, there is further
provided a smoking article comprising a first section comprising an
aerosol generating material and an aerosol modifying additive
disposed in an axial region thereof, and a second section
comprising a filter having at least one channel located in an axial
region thereof for directing the aerosol generated by the aerosol
generating material, in use, through the axial region of the first
section.
[0019] The second section can comprise a tubular filter section.
The tubular filter section can be formed from a fibrous filter
material.
[0020] The aerosol modifying additive can be disposed in a greater
concentration in said axial region than in non-axial regions of the
aerosol generating material of the first section.
[0021] The second section, in use, can direct a greater portion of
smoke through the axial region of the first section than through
non-axial regions of the first section.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Embodiments of the invention will now be described, by way
of example only, with reference to the accompanying drawings, in
which:
[0023] FIG. 1 is a schematic illustration of a smoking article
having a filter with a tubular downstream filter section and an
upstream filter section including an encapsulated additive in the
form of a frangible capsule;
[0024] FIG. 2 is a schematic illustration of a smoking article
having a filter with a tubular filter section and a filter section
including a thread carrying an additive;
[0025] FIG. 3 is a schematic illustration of a smoking article
having a filter with a tubular filter section and a filter section
including an encapsulated additive in the form of a plurality of
frangible capsules;
[0026] FIG. 4 is a schematic illustration of a smoking article
having a filter similar to that described with reference to FIG. 1
but also including a further filter section having an adsorbent
dispersed in filter material;
[0027] FIG. 5 is a schematic illustration of a smoking article
having a filter similar to that described with reference to FIG. 2
but also comprising a further filter section comprising an
adsorbent dispersed in filter material and disposed in a
circumferential region of the filter material;
[0028] FIG. 6 is a schematic illustration of a smoking article with
an aerosol generating section and a tubular filter section, the
aerosol generating section having an encapsulated additive in the
form of a plurality of microcapsules dispersed within an axial
region thereof; and
[0029] FIG. 7 is a schematic illustration of a smoking article
having a filter with a tubular upstream filter section and a
downstream filter section including an encapsulated additive in the
form of a frangible capsule.
DETAILED DESCRIPTION
[0030] As used herein, the term "smoking article" includes
smokeable products such as cigarettes, cigars and cigarillos
whether based on tobacco, tobacco derivatives, expanded tobacco,
reconstituted tobacco or tobacco substitutes and also heat-not-burn
products and other nicotine delivery devices capable of generating
an aerosol for delivery to a consumer. Such smoking articles may be
provided with a filter for the gaseous flow drawn by the
smoker.
[0031] Smoking articles such as cigarettes and their formats are
often named according to the cigarette length: "regular" (typically
in the range 68-75 mm, e.g. from about 68 mm to about 72 mm),
"short" or "mini" (68 mm or less), "king-size" (typically in the
range 75-91 mm, e.g. from about 79 mm to about 88 mm), "long" or
"super-king" (typically in the range 91-105 mm, e.g. from about 94
mm to about 101 mm) and "ultra-long" (typically in the range from
about 110 mm to about 121 mm).
[0032] They are also named according to the cigarette
circumference: "regular" (about 23-25 mm), "wide" (greater than 25
mm), "slim" (about 22-23 mm), "demi-slim" (about 19-22 mm),
"super-slim" (about 16-19 mm), and "micro-slim" (less than about 16
mm). Accordingly, a cigarette in a king-size, super-slim format
will, for example, have a length of about 83 mm and a circumference
of about 17 mm. Cigarettes in the regular, king-size format are
preferred by many customers, namely with a circumference of from 23
to 25 mm and an overall length of from 75 to 91 mm.
[0033] Each format may be produced with filters of different
lengths, smaller filters being generally used in formats of smaller
lengths and circumferences. Typically the filter length will be
from 15 mm, associated with short, regular formats, to 30 mm,
associated with ultra-long super-slim formats. The tipping paper
will have a greater length than the filter, for example from 3 to
10 mm longer.
[0034] Smoking articles and filters described hereinafter can be
manufactured in any of the above formats. The smoking article can,
for instance, be from 70 to 100 mm in length and from 14 to 25 mm
in circumference.
[0035] The terms `upstream` and `downstream` used herein are
relative terms defined in relation to the direction of mainstream
smoke (or other aerosol) drawn though a smoking article in use.
[0036] FIG. 1 is a schematic illustration of a smoking article 1
which is generally cylindrical in shape and is in the regular, king
size format, namely having a length in the range 75-91 mm and a
circumference in the range 23 to 25 mm. The smoking article 1
includes a tobacco rod 2 wrapped in a wrapping material 3, in this
example cigarette paper, connected longitudinally to a filter 4 by
tipping material 5 overlaying the filter 4 and partially overlaying
the wrapping material 3 so as to connect the filter 4 to the
tobacco rod 2. The filter 4 comprises a first section 6 at the
tobacco rod end of the filter 4 comprising absorbent material 7
having a capsule 8 disposed therein in an axial region of the
filter material of the first section 6. The axial region is a
region, in the present example, centred on the axis `a` of the
smoking article 1, having a radius of about 3 mm. In alternative
embodiments, the radius of the axial region can be anywhere from 1
mm to 4 mm, or from 1 mm to 3 mm, or about 1 mm, 1.5 mm, 2 mm, 2.5
mm, 3 mm or 3.5 mm.
[0037] The capsule 8, or other additive material, can be disposed
only in the axial region of the filter material of the first filter
section 6, or can be disposed in greater concentration in the axial
region than in non-axial regions of the filter material of the
first filter section 6. The first section is wrapped in a first
plug wrap 9.
[0038] The filter 4 further comprises a second section 10 at the
mouth-end of the filter 4 comprising fibrous filter material n
formed into a tubular shape and having a channel 12 extending
through the centre of the filter material 11. The empty or hollow
channel 12 extending through the centre of the filter material 11
can be from 1 mm to 6 mm in diameter, for instance from 2 mm to 5
mm in diameter. The channel 12 extending through the centre of the
filter material 11 is, in the present example, an empty, hollow
passageway. The channel, in some embodiments, extends through an
axial region of the filter material of the second filter section
10. The axial region of the second filter section 10 is a region,
in the present example, centred on the axis `a` of the smoking
article 1, having a radius of about 2.5 mm. In alternative
embodiments, the radius of the axial region can be anywhere from 1
mm to 4 mm, or from 1 mm to 3 mm, or about 1 mm, 1.5 mm, 2 mm, 2.5
mm, 3 mm or 3.5 mm. In the present example, the tubular filter
section is formed from cellulose acetate tow and is wrapped in a
second plug wrap 13. The wall thickness of the tubular filter is
about 1.5 mm. In alternative embodiments, the wall thickness can be
anywhere from 1 mm to 4 mm, or from 1 mm to 3 mm, or about 1 mm,
1.5 mm, 2 mm, 2.5 mm, 3 mm or 3.5 mm. However, the specific
dimensions may be selected based on the density of filter material
forming the tube and the level of plasticiser applied to the
material, to result in a tube having the desired rigidity, porosity
or other characteristics. The tubular filter section 10 can be
manufactured using existing processes and machinery.
[0039] The first segment 6 is a cellulose acetate segment formed
using continuous cellulose acetate fibres and a plasticiser. The
capsule 8 is spherical and has a diameter of 3.5 mm, although other
shapes and sizes of capsule can be used, and contains a fluid
additive which modifies properties of mainstream smoke passing
through the smoking article 1. The capsule 8 can be manufactured
and inserted into the first filter section 6 using existing
processes and machinery. In the present example, the capsule 8
contains menthol flavourant, although other fluids or granular
additives could be contained within the capsule 8. The capsule can
be ruptured by a consumer to release the fluid additive into the
absorbent filter material 11.
[0040] The axis of the smoking article 1, about which the tobacco
rod 2 and first and second filter sections 6, 10 are aligned, is
indicated as `a` in FIG. 1.
[0041] In the present example, the capsule 8 is located in an
`axial region` of the first filter section 6, as defined above. The
capsule 8 can be located such that the centre of the capsule is
closer to the axis `a` of the smoking article 1 than to the outer
periphery of the smoking article 1. In the present example, the
capsule 8 is located with its centre substantially along the axis
`a`. In the present example, the capsule 8 is offset from the
longitudinal centre of the first filter section 6. The capsule 8
can, for instance, be located within the first filter section 6 at
a position from 1 mm to 10 mm from a longitudinally central
position within the first filter section 6. The capsule 8 is
located within a portion of the first filter section 6 closer to
the downstream end of the first filter section 6. The capsule 8 is
therefore closer to the second filter section 10 than to the
tobacco rod 2. In particular, the distance `d` between the centre
of the capsule 8 and the downstream end of the first filter section
6 is less than half of the total longitudinal length of the first
filter section 6. In some embodiments, the distance is less than
40%, less than 30% or less than 25% of the total longitudinal
length of the first filter section 6. In the present example, the
distance is approximately 30% of the total longitudinal length of
the first filter section 6. In alternative embodiments, the capsule
8 can be located longitudinally centrally within the first filter
section 6 or closer to the upstream end of the first filter section
6 than to the downstream end.
[0042] The smoking article 1 is, in the present example, provided
with ventilation holes (not shown) through the tipping material 5
and first plug wrap 9, providing ventilation into the first filter
section 6. If formed by online laser perforation, the ventilation
holes are preferably located in a longitudinal position other than
that in which the capsule 8 is located, to avoid damaging the
capsule 8 during manufacture. For instance, in a smoking article
with a first upstream filter section 6 of length 20 mm and a second
downstream filter section 10 of length 7 mm, ventilation may be
provided at 20 mm from the mouth end, while the capsule 8 is
longitudinally centrally located within the first filter section
and, at 3.5 mm diameter, therefore extends from 15.25 mm to 18.75
mm from the mouth end.
[0043] In use, the tobacco rod 2 of the smoking article 1 is lit by
a consumer in the conventional manner and tobacco smoke is drawn
from burning coal of the tobacco rod 2 through the filter 4. The
channel 12 in the second filter section 10 has a lower resistance
to mainstream smoke passing through the filter 4 than the
surrounding tubular filter material 11, and therefore a greater
proportion of mainstream smoke is directed through the channel 12.
This, in turn, results in a greater flow of mainstream smoke in the
axial region around the axis `a` of the first filter section 6, in
which the capsule 8 is located. When the consumer breaks the
capsule 8 either prior to or in the course of smoking the smoking
article 1, the smoke modifying additive contained therein, in the
present case menthol, is released in greater concentration into the
axial region of the first filter section 6 through which an
increased flow of mainstream smoke is directed, as a result of the
second filter section 10. Accordingly, the increased flow of
mainstream smoke enhances the delivery of the smoke modifying
additive to the consumer and the smoking article 1 can therefore
exhibit improved delivery of a smoke modifying additive to a
consumer compared to conventional smoking articles.
[0044] Since the capsule 8 is located within a portion of the first
filter section 6 closer to the second filter section 10 than to the
tobacco rod 2, the effect of the increased flow of mainstream smoke
on the contents of the capsule 8, once released, is further
enhanced. The use of the tubular second section 10 at the mouth end
of the smoking article 1 enables the capsule 8 to be located closer
to the mouth-end of the smoking article 1 than would be possible if
the first section 6 containing the capsule 8 were at the mouth end
of the smoking article 1. This is because the tube separates the
first section 6 from the consumer's mouth, preventing the content
from the capsule 8 from contacting the consumer's mouth.
[0045] FIG. 2 is a schematic illustration of a smoking article 21
having a filter according to a further embodiment of the invention.
The features of the smoking article 21 are the same as those of the
smoking article 1 described with reference to FIG. 1, unless
otherwise stated below. The smoking article 21 includes a tobacco
rod 22 wrapped in a wrapping material 23, in this example cigarette
paper, connected longitudinally to a filter 24 by tipping material
25 overlaying the filter 24 and partially overlaying the wrapping
material 23. The filter 24 comprises a first section 26 at the
tobacco rod end of the filter 24 comprising absorbent material 27.
In the present case, rather than having a capsule 8 disposed in the
first filter section, the absorbent material 27 has an additive
carrying thread 28 disposed therein in an axial region (not shown)
of the first section 26, wherein the axial region of the first
filter section 26 is as defined in relation to the first filter
section 6 of the smoking article 1 described above. The thread can,
for instance, be formed from cotton or cellulose acetate fibres and
be loaded with between 0.1 and 10 mg of flavourant, such as menthol
flavourant. Loading levels of between 0.2 to 2 mg, or between 0.2
and 1 mg of flavourant have been found to be effective. The first
section 26 is wrapped in a first plug wrap 29. The thread 28
carries an additive capable of modifying mainstream smoke passing
through the filter 24, in the present case menthol flavourant.
[0046] The filter 24 further comprises a second section 30 at the
mouth-end of the filter 24 comprising fibrous filter material 31
formed into a tubular shape and having a channel 32 extending
through the centre of the filter material 31, or through an axial
region thereof, similar to the second section 10 of the filter 4 of
FIG. 1 described above. In the present example, the tubular filter
section is formed from cellulose acetate tow and is wrapped in a
second plug wrap 33.
[0047] The first segment 26 is a cellulose acetate segment formed
using continuous cellulose acetate fibres and a plasticiser. The
thread 28 can be inserted into the filter material during formation
of the filter section 26 using existing processes and
machinery.
[0048] In use, the smoking article 21 illustrated in FIG. 2
operates in a similar way to the smoking article 1 illustrated in
FIG. 1. However, rather than breaking a capsule 8 to release a
smoke modifying additive, the consumer can simply smoke the smoking
article 21 in the usual manner. When doing so, a greater flow of
mainstream smoke is directed, as a result of the second filter
section 30, through the axial region of the first filter section 26
in which the thread 28 carrying the smoke modifying additive is
located. Accordingly, when the smoking article is smoked, the
increased flow of mainstream smoke enhances the delivery of the
smoke modifying additive to the consumer and the smoking article 1
can therefore exhibit improved delivery of a smoke modifying
additive to a consumer than convention smoking articles.
[0049] FIG. 3 is a schematic illustration of a smoking article 41
having a filter according to a further embodiment of the invention.
The features of the smoking article 41 are the same as those of the
smoking article 1 described with reference to FIG. 1, unless
otherwise stated below. The smoking article 41 includes a tobacco
rod 42 wrapped in a wrapping material 43, in this example cigarette
paper, connected longitudinally to a filter 44 by tipping material
45 overlaying the filter 44 and partially overlaying the wrapping
material 43. The filter 44 comprises a first section 46 at the
tobacco rod end of the filter 44 comprising absorbent material 47.
In the present case, rather than having a capsule 8 disposed in the
first filter section, the absorbent material 47 has a plurality of
microcapsules disposed therein in an axial region thereof, the
axial region being as defined in relation to the first filter
section 6 of the smoking article 1 described above. The first
section 46 is wrapped in a first plug wrap 49.
[0050] The filter 44 further comprises a second section 50 at the
mouth-end of the filter 44 comprising fibrous filter material 51
formed into a tubular shape and having a channel 52 extending
through the centre of the filter material 51 or through the axial
region thereof, as described above with reference to the channel 12
of FIG. 1. In the present example, the tubular filter section is
formed from cellulose acetate tow and is wrapped in a second plug
wrap 53.
[0051] In use, the smoking article 41 illustrated in FIG. 3
operates in a similar way to the smoking article 1 illustrated in
FIG. 1. However, rather than breaking a single capsule 8 to release
a smoke modifying additive, the consumer breaks the plurality of
microcapsules 48 prior to or in the course of smoking the smoking
article 41. When doing so, a greater flow of mainstream smoke is
directed, as a result of the second filter section 50, through the
axial region of the first filter section 46 in which the smoke
modifying additive released from the microcapsules is located.
Accordingly, when the smoking article is smoked, the increased flow
of mainstream smoke enhances the delivery of the smoke modifying
additive to the consumer and the smoking article 41 can therefore
exhibit improved delivery of a smoke modifying additive to a
consumer than convention smoking articles.
[0052] FIG. 4 is a schematic illustration of a smoking article 61
having a filter according to a further embodiment of the invention.
The features of the smoking article 61 are the same as those of the
smoking article 1 described with reference to FIG. 1, unless
otherwise stated below. The smoking article 61 includes a tobacco
rod 62 wrapped in a wrapping material 63, in this example cigarette
paper, connected longitudinally to a filter 64 by tipping material
65 overlaying the filter 64 and partially overlaying the wrapping
material 63. The filter 64 comprises three filter sections,
including a first central section 66 comprising absorbent material
67 and a capsule 68 disposed in an axial region thereof, the axial
region being as defined in relation to the first filter section 6
of the smoking article 1 described above. The first section 66 is
wrapped in a first plug wrap 69.
[0053] A second filter section 70 is disposed at the mouth-end of
the three-part filter 64 and comprises fibrous filter material 71
formed into a tubular shape and having a channel 72 extending
through the centre of the filter material 71 or through the axial
region thereof, as described above with reference to the channel 12
of FIG. 1. In the present example, the tubular filter section is
formed from cellulose acetate tow and is wrapped in a second plug
wrap 73.
[0054] A third filter section 74 is disposed at the tobacco-end of
the three-part filter 64 and comprises granules of adsorbent
material 75, in the present case activated carbon granules,
dispersed within a fibrous filter material 76. In the present
example, the adsorbent material 75 is formed from cellulose acetate
tow and is wrapped in a third plug wrap 77. In the present example,
40 mg of activated carbon granules are used, although other
amounts, such as between 10 mg and 80 mg or between 10 mg and 50 mg
can be used.
[0055] In the present example, the capsule 68 is located within a
portion of the first filter section 66 closer to the downstream end
of the first filter section 66, or to the second filter section 70,
than to the upstream end of the first filter section, or to the
tobacco rod 62. In particular, the distance `d` between the centre
of the capsule 68 and the downstream end of the first filter
section 66 is approximately 30% of the total longitudinal length of
the first filter section 66. In alternative embodiments, the
capsule 68 can be located longitudinally centrally within the first
filter section 66 or closer to the upstream end of the first filter
section 66 than to the downstream end.
[0056] The first filter section 66 has a length of 10 mm in the
present example, the second filter section 70 a length of 7 mm and
the third filter section 74 a length of 10 mm, although other
section lengths can be used. Ventilation is provided into the third
filter section at a position 22 mm from the mouth end of the
smoking article 61.
[0057] In use, the smoking article 61 illustrated in FIG. 4
operates in a similar way to the smoking article 1 illustrated in
FIG. 1, with the additional third filter section 74 providing
additional selective smoke filtration upstream of the first filter
section 66 and therefore without influencing the delivery of smoke
modifying additive to the consumer.
[0058] FIG. 5 is a schematic illustration of a smoking article 81
having a filter according to a further embodiment of the invention.
The features of the smoking article 81 are the same as those of the
smoking article 61 described with reference to FIG. 4, unless
otherwise stated below. The smoking article 81 includes a tobacco
rod 82 wrapped in a wrapping material 83, in this example cigarette
paper, connected longitudinally to a filter 84 by tipping material
85 overlaying the filter 84 and partially overlaying the wrapping
material 83. The filter 84 comprises three filter sections,
including a first central section 86 comprising absorbent material
87 and, rather than a capsule 68, a thread 88 disposed therein, in
an axial region thereof, the axial region being as defined in
relation to the first filter section 6 of the smoking article 1
described above. The first section 86 is wrapped in a first plug
wrap 89.
[0059] A second filter section 90 is disposed at the mouth-end of
the three-part filter 84 and comprises fibrous filter material 91
formed into a tubular shape and having a channel 92 extending
through the centre of the filter material 91 or through the axial
region thereof, as described above with reference to the channel 12
of FIG. 1. In the present example, the tubular filter section is
formed from cellulose acetate tow and is wrapped in a second plug
wrap 93.
[0060] A third filter section 94 is disposed at the tobacco-end of
the three-part filter 84 and comprises granules of adsorbent
material 95, in the present case activated carbon granules,
dispersed within a fibrous filter material 96. The third filter
section 94 also comprises granules of adsorbent material 97, in the
present case activated carbon granules, dispersed in a
circumferential region thereof. However, in alternative examples
these may be omitted. In the present example, the fibrous filter
material 96 is formed from cellulose acetate tow and the third
filter section 94 is wrapped in a third plug wrap 98. The granules
of adsorbent material 97 dispersed in a circumferential region of
the third filter section 94 are applied to an inner surface of the
plug wrap 98 in a pattern of longitudinally extending strips, four
of which are evenly radially spaced around the third filter section
94. Adhering strips of granular adsorbent material 97 to plug wrap
in a symmetrical pattern about a filter section can help to prevent
the filter section becoming misshapen as a result of the adhesive
used, while maximising the amount of granular material 97 present
in the filter section.
[0061] The first filter section 86 has a length of 10 mm in the
present example, the second filter section 90 a length of 7 mm and
the third filter section 94 a length of 10 mm, although other
section lengths can be used. Ventilation is, for instance, provided
into the first and third filter sections at respective positions of
13 mm and 20 mm from the mouth end of the smoking article 81.
[0062] In use, the smoking article 81 illustrated in FIG. 5
operates in a similar way to the smoking article 21 illustrated in
FIG. 2, with the additional third filter section 94 providing
additional selective smoke filtration upstream of the first filter
section 86 and therefore without influencing the delivery of smoke
modifying additive to the consumer.
[0063] FIG. 6 is a schematic illustration of a smoking article 101
according to a further embodiment of the invention. The smoking
article 101 is generally cylindrical in shape and is in the
regular, king size format, namely having a length in the range
75-91 mm and a circumference in the range 23 to 25 mm. The smoking
article 101 includes a tobacco rod 102 wrapped in a wrapping
material 103, in this example cigarette paper, connected
longitudinally to a filter 104 by tipping material 105 overlaying
the filter 104 and partially overlaying the wrapping material 103.
The filter 104 comprises a first section 106 at the tobacco rod end
of the filter 104 comprising absorbent material 107 and wrapped in
a first plug wrap 108.
[0064] The filter 4 further comprises a second section 109 at the
mouth-end of the filter 104 comprising fibrous filter material 110
formed into a tubular shape and having a channel 111 extending
through the centre of the filter material 110 or through the axial
region thereof, as described above with reference to the channel 12
of FIG. 1. In the present example, the tubular filter section is
formed from cellulose acetate tow and is wrapped in a second plug
wrap 112.
[0065] The tobacco rod 102 includes a plurality of microcapsules
113 disposed in an axial region thereof at the filter end of the
tobacco rod 102, the axial region being similar in location and
size to that defined in relation to the first filter section 6 of
the smoking article 1 described above, except that it is located
within the tobacco rod 102.
[0066] The axis of the smoking article 1, along which the tobacco
rod 2 and first and second filter sections 46, 50 are disposed, is
indicated as `a` in FIG. 1.
[0067] In use, the smoking article 101 illustrated in FIG. 6
operates in a similar way to the smoking article 41 illustrated in
FIG. 3. However, rather than breaking the plurality of
microcapsules 48 in a filter section prior to or in the course of
smoking the smoking article 41, the consumer breaks the plurality
of microcapsules 113 located in the tobacco rod 102. When doing so,
a greater flow of mainstream smoke is directed, as a result of the
second filter section 109, through the axial region of the filter
end of the tobacco rod 2 in which the smoke modifying additive
released from the microcapsules is located. The increased flow of
mainstream smoke enhances the delivery of the smoke modifying
additive to the consumer and the smoking article 101 can therefore
exhibit improved delivery of a smoke modifying additive to a
consumer than convention smoking articles.
[0068] FIG. 7 is a schematic illustration of a smoking article 121
having a filter according to a further embodiment of the invention.
The features of the smoking article 121 are the same as those of
the smoking article 1 described with reference to FIG. 1, unless
otherwise stated below. The smoking article 121 includes a tobacco
rod 122 wrapped in a wrapping material 123, in this example
cigarette paper, connected longitudinally to a filter 124 by
tipping material 125 overlaying the filter 124 and partially
overlaying the wrapping material 123. The filter 124 comprises a
first section 126 at the mouth end of the filter 124, rather than
at the tobacco end of the filter, comprising absorbent material 127
and a capsule 128 disposed in an axial region thereof, the axial
region being as defined in relation to the first filter section 6
of the smoking article 1 described above.
[0069] The first section 126 is wrapped in a first plug wrap 129.
The capsule 128 contains an additive capable of modifying
mainstream smoke passing through the filter 124, in the present
case menthol flavourant.
[0070] The filter 124 further comprises a second section 130 at the
tobacco rod end of the filter 124 rather than at the mouth end of
the filter 124 comprising fibrous filter material 131 formed into a
tubular shape and having a channel 132 extending through the centre
of the filter material 131, or through an axial region thereof,
similar to the second section 10 of the filter 4 of FIG. 1. In the
present example, the tubular filter section is formed from
cellulose acetate tow and is wrapped in a second plug wrap 133.
[0071] The first segment 126 is a cellulose acetate segment formed
using continuous cellulose acetate fibres and a plasticiser. The
capsule 128 can be inserted into the filter material during
formation of the filter section 126 using existing processes and
machinery. In the present example, the capsule 128 is located
within a portion of the first filter section 126 closer to the
upstream end of the first filter section 126, or to the second
filter section 130, than to the downstream end of the first filter
section 126, or to the mouth end of the smoking article 121. In
particular, the distance `d` between the centre of the capsule 128
and the upstream end of the first filter section 126 is
approximately 30% of the total longitudinal length of the first
filter section 126. In alternative embodiments, the capsule 128 can
be located longitudinally centrally within the first filter section
126 or closer to the downstream end of the first filter section 126
than to the upstream end.
[0072] Although not illustrated, the embodiment of FIG. 7 may also
comprise a third filter section upstream of the second filter
section 130 corresponding to either of the third filter sections
74, 94 described with reference to FIGS. 4 and 5.
[0073] In use, the smoking article 121 illustrated in FIG. 7
operates in a similar way to the smoking article 1 illustrated in
FIG. 1. When the capsule 128 is ruptured to release a smoke
modifying additive, a greater flow of mainstream smoke is directed,
as a result of the second filter section 130, through the axial
region of the first filter section 126 in which the contents of the
capsule 128 have been released. Accordingly, when the smoking
article is smoked, the increased flow of mainstream smoke enhances
the delivery of the smoke modifying additive to the consumer and
the smoking article 121 can therefore exhibit improved delivery of
a smoke modifying additive to a consumer than convention smoking
articles.
[0074] Specific embodiments of the invention have been described,
although the invention is not limited to such embodiments. For
instance, although the second filter section has been described
above as a tubular portion of fibrous filter material, this may
take other forms, such as filter material sections with lower
density regions extending through an axial region thereof. Also,
the tubular section or other section having reduced density in an
axial region has been described as being at the mouth-end of the
filter in some embodiments above, but in any of the embodiments can
alternatively be used as a central or upstream end of multipart
filters, for instance upstream of the section in which the smoke
modifying additive is located, while still benefiting from the
effect of the invention. In particular, the presence of such a
filter section can encourage mainstream smoke to be directed to an
axial region of a smoking article both upstream and downstream of
the region, due to the lower resistance to draw coinciding with the
axial region.
[0075] The first, second and (where present) third filter sections
described above are discrete segments. Although the first, second
and (where present) third filter sections described above are
connected together using tipping material, they are individually
separate and distinct following their formation and prior to being
connected together. The tipping material also connects the filter
sections to the respective tobacco rod of each embodiment. In
alternative examples of each of the described embodiments, a
further plug wrap can be used to connect the first, second and
(where present) third discrete filter sections before they are
connected to the tobacco rods using the tipping material.
[0076] In order to address various issues and advance the art, the
entirety of this disclosure shows by way of illustration various
embodiments in which the claimed invention(s) may be practiced and
provide for superior delivery of a smoke modifying additives. The
advantages and features of the disclosure are of a representative
sample of embodiments only, and are not exhaustive and/or
exclusive. They are presented only to assist in understanding and
teach the claimed features. It is to be understood that advantages,
embodiments, examples, functions, features, structures, and/or
other aspects of the disclosure are not to be considered
limitations on the disclosure as defined by the claims or
limitations on equivalents to the claims, and that other
embodiments may be utilised and modifications may be made without
departing from the scope and/or spirit of the disclosure. Various
embodiments may suitably comprise, consist of, or consist
essentially of, various combinations of the disclosed elements,
components, features, parts, steps, means, etc. In addition, the
disclosure includes other inventions not presently claimed, but
which may be claimed in future.
* * * * *