U.S. patent application number 17/259558 was filed with the patent office on 2021-06-17 for variable-ventilation filter tip and cigarette.
This patent application is currently assigned to CHINA TOBACCO GUANGDONG INDUSTRIAL CO., LTD.. The applicant listed for this patent is CHINA TOBACCO GUANGDONG INDUSTRIAL CO., LTD.. Invention is credited to Jing HU, Dan LI, Feng LI, Xi LIU, Yibo LIU, Jing SHAN, Rongfei YE, Ruifeng ZHAO.
Application Number | 20210177047 17/259558 |
Document ID | / |
Family ID | 1000005489168 |
Filed Date | 2021-06-17 |
United States Patent
Application |
20210177047 |
Kind Code |
A1 |
LIU; Xi ; et al. |
June 17, 2021 |
VARIABLE-VENTILATION FILTER TIP AND CIGARETTE
Abstract
The invention discloses a variable-ventilation filter tip and a
cigarette. The filter tip includes a filter element and a coating
layer. The coating layer wraps the filter element. The filter
element includes a smoke inlet end and a smoke release end. A
phase-change ventilation area and a non-phase-change ventilation
area are arranged on the coating layer, a plurality of first
ventilation holes are arranged in the phase-change ventilation
area, and a plurality of second ventilation holes are arranged in
the non-phase-change ventilation area. Outside air penetrates
through the coating layer through the first ventilation holes and
the second ventilation holes to enter a part of the filter element.
A part in the filter element close to the smoke inlet end is
provided with a starch tube. A phase-change material is filled in
the first ventilation hole. A phase-change temperature of the
phase-change material ranges from 45.degree. C. to 60.degree.
C.
Inventors: |
LIU; Xi; (Guangdong, CN)
; LI; Feng; (Guangdong, CN) ; LIU; Yibo;
(Guangdong, CN) ; HU; Jing; (Guangdong, CN)
; ZHAO; Ruifeng; (Guangdong, CN) ; YE;
Rongfei; (Guangdong, CN) ; LI; Dan;
(Guangdong, CN) ; SHAN; Jing; (Guangdong,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA TOBACCO GUANGDONG INDUSTRIAL CO., LTD. |
Guangdong |
|
CN |
|
|
Assignee: |
CHINA TOBACCO GUANGDONG INDUSTRIAL
CO., LTD.
Guangdong
CN
|
Family ID: |
1000005489168 |
Appl. No.: |
17/259558 |
Filed: |
August 27, 2019 |
PCT Filed: |
August 27, 2019 |
PCT NO: |
PCT/CN2019/102662 |
371 Date: |
January 12, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A24D 3/08 20130101; A24D
3/043 20130101; A24D 3/048 20130101; A24D 1/045 20130101; A24D 3/17
20200101; A24D 1/20 20200101 |
International
Class: |
A24D 3/04 20060101
A24D003/04; A24D 3/08 20060101 A24D003/08; A24D 1/04 20060101
A24D001/04; A24D 1/20 20060101 A24D001/20; A24D 3/17 20060101
A24D003/17 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 24, 2019 |
CN |
201910672151.4 |
Claims
1. A variable-ventilation filter tip, comprising a filter element
and a coating layer, wherein the coating layer wraps the filter
element; and the filter element comprises a smoke inlet end and a
smoke release end; a phase-change ventilation area and a
non-phase-change ventilation area are arranged on the coating
layer, a plurality of first ventilation holes are arranged in the
phase-change ventilation area, and a plurality of second
ventilation holes are arranged in the non-phase-change ventilation
area; outside air passes through the coating layer through the
first ventilation holes and the second ventilation holes
respectively to penetrate into a part of the filter element; a
phase-change material is filled in the first ventilation hole; a
part in the filter element close to the smoke inlet end is provided
with a starch tube; and a phase-change temperature of the
phase-change material ranges from 45.degree. C. to 60.degree.
C.
2. The variable-ventilation filter tip according to claim 1,
wherein the phase-change ventilation area is close to the smoke
inlet end.
3. The variable-ventilation filter tip according to claim 2,
wherein a distance between the phase-change ventilation area and
the smoke inlet end is not less than a distance between the
phase-change ventilation area and the non-phase-change ventilation
area.
4. The variable-ventilation filter tip according to claim 3,
wherein the phase-change temperature of the phase-change material
ranges from 55.degree. C. to 60.degree. C.
5. The variable-ventilation filter tip according to claim 1,
wherein the non-phase-change ventilation area is close to the smoke
inlet end.
6. The variable-ventilation filter tip according to claim 5,
wherein a distance between the non-phase-change ventilation area
and the smoke inlet end is no less than a distance between the
phase-change ventilation area and the non-phase-change ventilation
area.
7. The variable-ventilation filter tip according to claim 6,
wherein the phase-change temperature of the phase-change material
ranges from 45.degree. C. to 55.degree. C.
8. The variable-ventilation filter tip according to claim 2,
wherein the phase-change ventilation area is located on the starch
tube.
9. The variable-ventilation filter tip according to claim 1,
wherein when only the second ventilation holes are ventilated, a
total ventilation rate of a cigarette ranges from 40% to 60%; and
when the first ventilation holes and the second ventilation holes
are ventilated at the same time, the total ventilation rate of the
cigarette is not lower than 70%.
10. A cigarette, comprising the variable-ventilation filter tip
according to claim 1.
11. The variable-ventilation filter tip according to claim 2,
wherein when only the second ventilation holes are ventilated, a
total ventilation rate of a cigarette ranges from 40% to 60%; and
when the first ventilation holes and the second ventilation holes
are ventilated at the same time, the total ventilation rate of the
cigarette is no lower than 70%.
12. The variable-ventilation filter tip according to claim 5,
wherein when only the second ventilation holes are ventilated, a
total ventilation rate of a cigarette ranges from 40% to 60%; and
when the first ventilation holes and the second ventilation holes
are ventilated at the same time, the total ventilation rate of the
cigarette is no lower than 70%.
13. A cigarette, comprising the variable-ventilation filter tip
according to claim 2.
14. A cigarette, comprising the variable-ventilation filter tip
according to claim 3.
15. A cigarette, comprising the variable-ventilation filter tip
according to claim 4.
16. A cigarette, comprising the variable-ventilation filter tip
according to claim 5.
17. A cigarette, comprising the variable-ventilation filter tip
according to claim 6.
18. A cigarette, comprising the variable-ventilation filter tip
according to claim 7.
19. A cigarette, comprising the variable-ventilation filter tip
according to claim 8.
20. A cigarette, comprising the variable-ventilation filter tip
according to claim 9.
Description
BACKGROUND
Technical Field
[0001] The present invention relates to the field of cigarette
filter tip designing and processing, and more particularly, to a
variable-ventilation filter tip and a cigarette.
Description of Related Art
[0002] A cigarette may be sucked by burning cut tobaccos with open
flame or baking the cut tobaccos without burning to release smoke.
No matter which manner is used to release the smoke, it is
necessary to filter the smoke through a filter tip, and then the
smoke enters a human body.
[0003] At present, the design of the filter tip is often considered
to only meet a single condition, for example, only a condition of
sucking by ignition is met, or only a condition of sucking without
burning is met. However, a user not only needs to suck the smoke by
ignition, but also needs to suck the smoke without burning. In this
case, the design of a traditional filter tip cannot meet the needs
of the user, thus bringing inconvenience to the user.
[0004] Improvement of the filter tip in the prior art is still
limited to a single sucking manner, for example, in the Chinese
patent application No. 201721766369.9, a ventilation rate is
automatically changed by arranging a piece of high permeability
paper between a filter stick and a piece of tipping paper and
coating a phase-change material on the high permeability paper.
However, such structural design can only meet automatic adjustment
of sucking the smoke by ignition. For the increasing demands of
consumers, there is still a lack of a filter tip which can not only
meet the sucking manner by ignition, but also meet the heat-not
burn sucking manner.
SUMMARY
[0005] A technical problem to be mainly solved by the present
invention is to aim at the prior art that lacks of a cigarette
which can not only meet a sucking manner by ignition, but also meet
a sucking manner of non-ignition heating, to provide a
variable-ventilation filter tip.
[0006] Another technical problem to be solved by the present
invention is to provide a cigarette applying the
variable-ventilation filter tip.
[0007] In order to solve the above technical problems, specific
technical solutions adopted by the present invention are as
follows.
[0008] A variable-ventilation filter tip includes a filter element
and a coating layer. The coating layer wraps the filter element.
The filter element includes a smoke inlet end and a smoke release
end. A phase-change ventilation area and a non-phase-change
ventilation area are arranged on the coating layer, a plurality of
first ventilation holes are arranged in the phase-change
ventilation area, and a plurality of second ventilation holes are
arranged in the non-phase-change ventilation area. Outside air
passes through the coating layer through the first ventilation
holes and the second ventilation holes respectively to penetrate
into a part of the filter element. A phase-change material is
filled in the first ventilation hole. A part in the filter element
close to the smoke inlet end is provided with a starch tube. A
phase-change temperature of the phase-change material ranges from
45.degree. C. to 60.degree. C.
[0009] According to the present invention, the phase-change
ventilation area and the non-phase-change ventilation area are
arranged at the coating layer, and the first ventilation holes and
the second ventilation holes are respectively arranged in the
phase-change ventilation area and the non-phase-change ventilation
area, the phase-change material is filled in the first ventilation
hole, the phase-change ventilation area serves as a selective
ventilation area which can be automatically opened as the
temperature changes, and the non-phase-change ventilation area is a
constant ventilation area. When the sucking manner of non-ignition
heating is used, the temperature of the smoke release end is very
high, which will melt the phase-change material. At this time, the
first ventilation holes are automatically opened to increase a
ventilation volume and reduce the temperature of the smoke sucked
out. When the sucking manner by ignition is used, the temperature
of the smoke release end is low, which will not affect sucking.
[0010] On one hand, the starch tube in the present invention has a
good cooling effect, and on the other hand, the starch tube has a
certain supporting effect, and is convenient for inserting the
cigarette especially when the sucking manner of non-ignition
heating is used.
[0011] As a preferable solution of the present invention, the
phase-change ventilation area is close to the smoke inlet end, or
the non-phase-change ventilation area is close to the smoke inlet
end.
[0012] As a preferred technical solution, the phase-change
ventilation area is close to the smoke inlet end, or the
non-phase-change ventilation area is close to the smoke inlet end.
When the phase-change ventilation area is close to the smoke inlet
end, the phase-change ventilation area first senses a temperature
change, which is beneficial to control the ventilation volume and
has a good cooling effect. When the non-phase change ventilation
area is close to the smoke inlet end, such structure is convenient
for processing and manufacturing. However, no matter which one of
the above two ventilation area arrangements is employed, the
objective of "one smoke and two sucking manners" can be achieved,
but each arrangement has its own preference, either for cooling
effect, or for processing and manufacturing.
[0013] As a preferred solution of the present invention, a distance
between the phase-change ventilation area and the smoke inlet end
is not less than a distance between the phase-change ventilation
area and the non-phase-change ventilation area. Or, a distance
between the non-phase-change ventilation area and the smoke inlet
end is not less than the distance between the phase-change
ventilation area and the non-phase-change ventilation area.
[0014] According to the present invention, a distance between the
phase-change ventilation area and another position is measured by
taking a central line of the phase-change ventilation area as a
starting point and taking the another position as an end point, and
this distance is the distance between the two. Similarly, the
distance measurement of the non-phase-change ventilation area is
consistent with that of the phase-change ventilation area.
[0015] The purpose of doing this is that in the sucking manner of
non-ignition heating, because a part of a cooling section is
inserted into a heating device and contacts with the
high-temperature smoke, limitation of the distance can make better
use of the cooling section for cooling.
[0016] As a preferred solution of the present invention, a
phase-change temperature of the phase-change material ranges from
55.degree. C. to 60.degree. C., or 45.degree. C. to 55.degree. C.
In order to ensure that a temperature of smoke entering a body of a
user is not too high and avoid burning a mouth, the phase-change
material needs to undergo phase change under a certain condition in
the temperature range of 45.degree. C. to 60.degree. C., a
phase-change state may either be melting or shrinking, and all
phase-change forms which can meet the needs of opening the
ventilation area and increasing the ventilation volume are
suitable. The phase-change temperature of the phase-change material
determines a sensation temperature of the smoke entering the user,
and the needs of the user can be satisfied only when the
phase-change material is melted in a suitable temperature range for
ventilating and cooling. Therefore, when the phase-change material
is close to the smoke inlet end, the phase-change temperature of
the phase-change material is high, and it is more suitable to use
the phase-change material with the phase-change temperature ranging
from 55.degree. C. to 60.degree. C. When the phase-change material
is far away from the smoke inlet end, the phase-change temperature
of the phase-change material is low, so it is more suitable to use
the phase-change material with the phase-change temperature ranging
from 45.degree. C. to 55.degree. C.
[0017] As a preferred solution of the present invention, the
phase-change material includes the following constituents in parts
by weight: 7 to 10 parts of a starch, 0.1 to 1.5 parts of a
polylactic acid, and 0.1 to 1.5 parts of a polyol.
[0018] As a preferred solution of the present invention, the starch
is selected from one or more of a corn starch, a potato starch, a
purple potato starch, and a lily starch, wherein grain sizes of the
corn starch, the potato starch, the purple potato starch and the
lily starch are all in a range of 10 .mu.m to 100 .mu.m.
[0019] As a preferred solution of the present invention, a
molecular weight of the polylactic acid is 20,000 to 80,000.
[0020] The phase-change material is composed of fully degradable
biological materials, which has a high environmental protection
value. The addition of the polyol softens the material and improves
fluidity, thus being more convenient to open the phase-change
ventilation area. The ventilation of the phase-change ventilation
area depends on the opening of the first ventilation holes. A
specific opening mode of the first ventilation holes is that: the
phase-change material contacts the high-temperature smoke and
undergoes phase change. Meanwhile, due to a high sucking pressure
at a center of the phase-change material, the state of the
phase-change material changes from being closed to gradually
opening from the center to both sides, thus realizing a process of
increasing the ventilation volume of the phase-change ventilation
area with the increase of temperature.
[0021] Here, a specific weight ratio of the phase-change material
used in the present invention is given as follows: 7.0 to 10.0
parts of the starch, 0.1 to 1.5 parts of the phase-change material,
and 0.1 to 1.5 parts of the polyol. The starch may be selected from
one or more of the corn starch, the potato starch, the purple
potato starch, and the lily starch, with the grain size in the
range of 10 .mu.m to 100 .mu.m. The polyol is selected from one or
two of propylene glycol or glycerol. In order to change the
ventilation volume of the phase-change material in time with the
change of temperature, a thickness of the phase-change material
depends on a temperature resistance of the material, and different
materials have different temperature resistance. Generally
speaking, when the phase-change material is too thick, more heat is
needed to open the holes. Therefore, the thickness of the
phase-change material is preferably in a range of 50 .mu.m to 500
.mu.m.
[0022] As a preferred solution of the present invention, when only
the second ventilation holes are used for ventilation, a total
ventilation rate of the cigarette is in a range of 30% to 60%. When
the first ventilation holes and the second ventilation holes are
ventilated at the same time, the total ventilation rate of the
cigarette is not lower than 70%. In this way, the proper
ventilation rate and good sucking experience of the cigarette can
be ensured in the case that the cigarette is ignited and sucked,
and the ventilation can be increased in the case of heat-not-burn
sucking, so that a temperature of hot smoke and a temperature on a
surface of the filter tip can be effectively reduced. If the first
ventilation holes and the second ventilation holes are of
ventilation hole structures and evenly distributed on the coating
layer, quantities, aperture sizes and arrangements of these
ventilation holes may be adjusted according to actual needs to meet
the ventilation rate requirements of the cigarette. However, it is
found through experimental studies that the ventilation rate may be
consistent when the cigarette is close to the smoke release end at
different distances, but the cooling effect is also related to the
design of a cigarette structure, a material and a supporting
heater. Therefore, the cooling effect can also be achieved by
reasonably setting positions of the ventilation holes and combining
the design of the cigarette and the supporting heater. It is worth
noting that with the burning of the cigarette, a temperature at the
filter end also gradually increases. When the cigarette is ignited
and sucked to a rear end, the first ventilation holes may be
opened, which may lead to more airflow entering the filter tip to
dilute the smoke and reduce the temperature of the smoke during
sucking, thus being capable of ensuring the consistency of a
sucking taste. As a further preferred technical solution, the
distance between the phase-change ventilation area and the smoke
inlet end is less than the distance between the phase-change
ventilation area and the non-phase-change ventilation area, and
such arrangement is beneficial to improving the taste of the
smoke.
[0023] In order to realize the application of the filter tip,
especially in the ever-changing tobacco revolution times, the
present invention further provides as follows.
[0024] A cigarette including the above-mentioned filter tip, which
may be used in a traditional sucking manner by ignition, or used in
a sucking manner of non-ignition heating.
[0025] In the present invention, the cigarette further includes a
tobacco section, and the filter tip is connected with the tobacco
section.
[0026] Compared with the prior art, the present invention has the
following beneficial effects.
[0027] According to the present invention, the phase-change
ventilation area and the non-phase-change ventilation area are
arranged at the coating layer, and the first ventilation holes and
the second ventilation holes are respectively arranged in the
phase-change ventilation area and the non-phase-change ventilation
area, the phase-change material is filled in the first ventilation
hole, the phase-change ventilation area serves as a selective
ventilation area which can be automatically opened as the
temperature changes, and the non-phase-change ventilation area is a
constant ventilation area. When the sucking manner of non-ignition
heating is used, the temperature of the smoke release end is very
high, which will melt the phase-change material. At this time, the
first ventilation holes are automatically opened to increase the
ventilation volume and reduce the temperature of the smoke sucked
out. When the sucking manner by ignition is used, the temperature
of the smoke release end is low, which will not affect sucking.
[0028] To make the aforementioned more comprehensible, several
embodiments accompanied with drawings are described in detail as
follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] FIG. 1 is a schematic diagram of a three-dimensional
structure of the present invention.
[0030] FIG. 2 is a schematic diagram of a front view structure of
the present invention.
[0031] FIG. 3 is a structural schematic diagram of the present
invention in a use state.
[0032] FIG. 4 is a structural schematic diagram of the present
invention in another use state.
[0033] FIG. 5 is a structural schematic diagram of a cooling
section of the present invention.
[0034] In the drawings: 1 refers to filter element; 11 refers to
smoke inlet end; 12 refers to smoke release end; 14 refers to
starch tube; 15 refers to hollow cavity; 2 refers to coating layer;
21 refers to phase-change ventilation area; 22 refers to
non-phase-change ventilation area; 211 refers to phase-change
material; 212 refers to first ventilation hole; and 221 refers to
second ventilation hole.
DESCRIPTION OF THE EMBODIMENTS
[0035] The present invention will be further described below with
reference to specific implementations.
Embodiment 1
[0036] As shown in FIG. 1 to FIG. 5, this embodiment provides a
variable-ventilation filter tip, which includes a filter element 1
and a coating layer 2. The coating layer 2 wraps the filter element
1. The filter element 1 includes a smoke inlet end 11 and a smoke
release end 12. A phase-change ventilation area 21 and a
non-phase-change ventilation area 22 are arranged on the coating
layer 2, a plurality of first ventilation holes 212 are arranged in
the phase-change ventilation area, and a plurality of second
ventilation holes 221 are arranged in the non-phase-change
ventilation area 22. Outside air penetrates through the coating
layer 2 through the first ventilation holes 212 and the second
ventilation holes 221 to enter a part of the filter element 13. A
phase-change material 211 is filled in the first ventilation hole
212. A starch tube 14 is arranged in a part of the filter element
close to the smoke inlet end, and the starch tube 14 is provided
with a hollow cavity 15. A phase-change temperature of the
phase-change material 211 ranges from 45.degree. C. to 60.degree.
C.
[0037] A specific opening manner of the first ventilation holes 212
is that: the phase-change material 211 contacts high-temperature
smoke and undergoes phase change. Meanwhile, because a pressure at
a center of the phase-change material 211 is high due to a sucking
force, a state of the phase-change material 211 changes from being
closed to gradually opening from the center to both sides, thus
realizing a process of increasing the ventilation volume of the
phase-change ventilation area with the increase of temperature.
[0038] When the phase-change ventilation area 21 is close to the
smoke inlet end 11, the phase-change ventilation area 21 first
senses a temperature change, which is beneficial to control the
ventilation volume and has a good cooling effect. At this time, the
phase-change temperature of the phase-change material 211 is in a
range of 55.degree. C. to 60.degree. C. When the non-phase-change
ventilation area 221 is close to the smoke inlet end, the
phase-change temperature of the phase-change material 211 is in a
range of 45.degree. C. to 55.degree. C., which is relatively low,
and such structure is convenient for processing and manufacturing.
However, no matter which one of the above two ventilation area
arrangements is employed, the objective of "one smoke and two
sucking manners" can be achieved, but each arrangement has its own
preference, either for cooling effect, or for processing and
manufacturing. In this embodiment, a distance between the
phase-change ventilation area 21 and the smoke inlet end 11 is not
less than a distance between the phase-change ventilation area 21
and the non-phase-change ventilation area 22, and such arrangement
is conducive to improving a taste of the smoke. In this case, the
phase-change material 211 undergoes phase change at 55.degree. C.
to increase the ventilation volume, and a ventilation rate is
80%.
[0039] The coating layer 2 is provided with the phase-change
ventilation area 21 and the non-phase-change ventilation area 22.
The phase-change material 211 is arranged on the phase-change
ventilation area 21. In this embodiment, the plurality of first
ventilation holes 212 are arranged in the phase-change ventilation
area 21, and the phase-change material 211 is filled in the first
ventilation hole 212. A structure of the ventilation hole is easy
to process. On one hand, filling the phase-change material 211 in
the hole will not increase a thickness of the coating layer 2,
which makes the filter natural and beautiful. On the other hand,
the phase-change material 211 has a high degree of binding in the
hole and is not easy to fall off. The second ventilation holes 221
are evenly arranged in the non-phase-change ventilation area
22.
[0040] The phase-change material 211 can undergo phase change at a
temperature condition ranging from 45.degree. C. to 60.degree. C.
The phase-change temperature of the phase-change material 211
determines a sensation temperature of the smoke entering a user,
and needs of the user may be satisfied only when the phase-change
material is melted in a suitable temperature range for ventilating
and cooling. Therefore, it is more suitable to use the phase-change
material with the phase-change temperature ranging from 50.degree.
C. to 55.degree. C. In this embodiment, the phase-change
temperature ranges from 50.degree. C. to 55.degree. C., and the
employed phase-change material includes constituents of a starch, a
polylactic acid, and a polyol, which has the advantages of
convenient combination and easy circulation. In order to meet the
requirement that the ventilation volume of the phase-change
material changes in time with the change of temperature, a
thickness of the phase-change material cannot be too thick. In this
embodiment, the thickness of the phase-change material ranges from
50 .mu.m to 500 .mu.m. Specifically in this embodiment, the
thickness of the phase-change material is 300 .mu.m. In addition,
when only the non-phase-change ventilation area 22 is ventilated, a
total ventilation rate of a cigarette is in a range of 30% to 60%.
When the phase-change ventilation area 21 and the non-phase-change
ventilation area 22 are ventilated at the same time, the
ventilation rate of the filter tip is not lower than 70%, and such
structure can provide a better and more stable taste of smoke. If
the phase-change ventilation area 21 and the non-phase-change
ventilation area 22 are of ventilation hole structures and evenly
distributed on the coating layer 2, quantities, aperture sizes and
arrangements of these ventilation holes may be adjusted according
to actual needs to meet the ventilation rate requirements of the
cigarette. An effect of reducing the temperature of the smoke can
also be achieved by adjusting positions of the first ventilation
holes.
[0041] A cigarette applying the above-mentioned filter may be used
in a traditional sucking manner by ignition, and may also be
applied to a sucking manner of non-ignition heating.
[0042] In the present invention, the cigarette further includes a
tobacco section, and the filter tip is connected with the tobacco
section.
[0043] A working principle of the present invention is as
follows.
[0044] When the cigarette is sucked in the ignition manner, the
phase-change ventilation area 21 is kept in a closed state. The
non-phase-change ventilation area 22 increases a certain
ventilation volume, which is enough to reduce the temperature at
which cut tobaccos are released into a human body. When the
cigarette is sucked in the heat-not-burn manner, the temperature of
the smoke entering the filter tip is higher than that when smoking
in the ignition manner. At this time, the phase-change material 211
in the phase-change ventilation area 21 undergoes phase change. The
phase-change ventilation area 21 is opened to increase the
ventilation volume. At this time, the total ventilation rate of the
cigarette can reach more than 70%.
Embodiment 2
[0045] As shown in FIG. 4, this embodiment is a second embodiment
of the present invention, which is basically the same as Embodiment
1, except that the non-phase-change ventilation area 22 is close to
the smoke inlet end 11, and the distance between the
non-phase-change ventilation area 22 and the smoke inlet end 11 is
not less than the distance between the phase-change ventilation
area 21 and the non-phase-change ventilation area 22. At this
moment, the phase-change material 211 undergoes phase change at
50.degree. C. to increase the ventilation volume, and the total
ventilation rate of the cigarette is 75%.
[0046] Obviously, the above-mentioned embodiments of the present
invention are merely examples for clearly illustrating the present
invention, but are not intended to limit the implementations of the
present invention. For those of ordinary skills in the art, other
different forms of changes or variations can be made on the basis
of the above description. It is not necessary or possible to
exhaust all the implementations here. Any modifications, equivalent
substitutions, and improvements made within the spirit and
principle of the present invention shall all fall within the scope
of protection claimed by the present invention.
* * * * *