CN217284742U

CN217284742U - Filter tip for cigarette and cigarette

Info

Publication number: CN217284742U
Application number: CN202122965001.8U
Authority: CN
Inventors: 李力群; 陈晨; 乔月梅; 纪旭东; 许艳冉; 杜赫; 郭春生; 柴颖; 叶亚军; 王伟华; 赵赛月; 高磊; 王志刚
Original assignee: Inner Mongolia Kunming Cigarettes Co ltd
Current assignee: Inner Mongolia Kunming Cigarettes Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-08-26
Anticipated expiration: 2031-11-29

Abstract

The application discloses a cigarette is with filter tip and cigarette. The filter includes: the smoke-discharging device comprises an outer shell and an inner shell sleeved in the outer shell, wherein a cavity between the outer shell and the inner shell forms a smoke channel, two ends of the smoke channel are respectively provided with a smoke outlet and at least one smoke inlet, one end of the inner shell is connected with one end of the outer shell through a connecting surface, and the smoke inlet is arranged on the connecting surface; the smoke passes through the smoke inlet and the smoke channel in sequence and then flows out of the filter tip through the smoke outlet. The filter tip can greatly reduce the suction resistance, ensure a certain smoke concentration, keep the fragrance components, and greatly reduce harmful substances such as tar and the like in smoke; and the filter tip can be integrally formed, the processing process is simple, and the production efficiency is greatly improved.

Description

Filter tip for cigarette and cigarette

Technical Field

The application relates to a cigarette is with filter tip and cigarette belongs to a cigarette technical field.

Background

At present, a wide variety of cigarette products exist in the market, and in general, a common heating non-combustion cigarette comprises an aerosol generation substrate for generating composite aerosol and a filter tip for filtering out partial harmful substances in the composite aerosol.

At present, in order to improve the filtering effect, the outer shell of the filter tip is often filled with a highly adsorptive material such as activated carbon and the like as a core body, so that although more harmful substances can be filtered to a certain extent, the filtering capability is improved, and the overall absorption resistance of the filter tip is also enhanced; in addition, due to the supporting effect of the core, in the process of suction, the existence of the core can cause the stress change of the outer shell, further cause the deformation condition, and improve the suction resistance, so in order to reduce the deformation condition of the outer shell, the outer shell of the filter tip is generally required to be made of hard materials, however, the hard materials cause poor user experience, and the deformation condition is difficult to completely avoid, so that the suction resistance is increased; in the production process, the core body and the outer shell body need to be assembled independently, the process is complicated, and automatic production cannot be realized.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the application provides a filter tip for cigarettes and a cigarette. The filter tip can greatly reduce the suction resistance, ensure a certain smoke concentration, keep the fragrance components, and greatly reduce harmful substances such as tar and the like in smoke; and the filter tip can be integrally formed, the processing process is simple, and the production efficiency is greatly improved.

According to one aspect of the present application, there is provided a filter for tobacco rods comprising: the smoke-discharging device comprises an outer shell and an inner shell sleeved in the outer shell, wherein a cavity between the outer shell and the inner shell forms a smoke channel, two ends of the smoke channel are respectively provided with a smoke outlet and at least one smoke inlet, one end of the inner shell is connected with one end of the outer shell through a connecting surface, and the smoke inlet is arranged on the connecting surface;

the smoke passes through the smoke inlet and the smoke channel in sequence and then flows out of the filter tip through the smoke outlet.

Optionally, the end of the inner shell far away from the smoke inlet is a closed end, a buffer chamber is formed inside the inner shell, and the smoke inlet is arranged at the connecting position between the connecting surface and the inner shell.

Optionally, the outer shell includes a first outer shell and a second outer shell connected to each other, an annular cavity between the first outer shell and the inner shell forms a first flue gas channel, and a second flue gas channel is formed inside the second outer shell;

the smoke passes through the smoke inlet, the first smoke channel and the second smoke channel in sequence and then flows out of the filter tip through the smoke outlet.

Optionally, the ratio of the inner diameter of the outer shell to the width of the first flue gas channel is (3-8): 1.

optionally, a ratio of lengths of the inner shell to the outer shell is (0.3-0.7): 1.

optionally, one end of the smoke channel is provided with two smoke inlets, and the two smoke inlets are uniformly distributed on the connecting surface.

Optionally, the ratio of the area of the smoke outlet to the area of the smoke inlet is (55-145): 1.

optionally, an end of the outer shell away from the smoke inlet is all open to form the smoke outlet.

Optionally, the outer shell is disposed concentrically with the inner shell.

According to another aspect of the present application there is provided a cigarette comprising a connected smoking portion for producing smoke and a filter selected from the filters of any of the above.

Wherein, the cigarette can be a traditional cigarette or a cigarette which is not burnt by heating.

Benefits that can be produced by the present application include, but are not limited to:

1. the cigarette filter tip provided by the application forms a smoke channel through the cavity between the outer shell and the inner shell, smoke enters the filter tip and flows out of the filter tip after passing through the cavity structure, so that the suction resistance is greatly reduced, meanwhile, certain smoke concentration can be ensured, and aroma components are kept; the smoke inlet is arranged on the connecting surface between the inner shell and the outer shell, so that smoke enters the smoke channel through the smoke inlet, and the effects of reducing tar and reducing harm are achieved; in addition, the filter tip can be integrally formed, the processing process is simple, and the production efficiency is greatly improved.

2. The application provides a cigarette filter tip, one end of keeping away from into the mouth through setting up interior casing is the blind end, and advance the mouth setting and connecting the junction between face and the interior casing, can make partial flue gas get into first flue gas passageway through advancing the mouth again after the circulation in the surge chamber, the setting of surge chamber can change the flue gas route, reduce the flue gas temperature, avoid flue gas temperature too high, can make the deposit of grain looks thing in the flue gas in the surge chamber simultaneously, increase the effect of reducing the burnt harm.

3. According to the cigarette filter tip, the first smoke channel and the second smoke channel are both of the cavity structure, smoke enters the filter tip and flows out of the filter tip after passing through the cavity structure, so that the suction resistance is greatly reduced, a certain smoke concentration can be ensured, and aroma components are reserved; through setting up first flue gas passageway of formation between first shell body and the interior casing, and advance the mouth and communicate with first flue gas passageway to make the flue gas through colliding the casing wall when the first flue gas passageway of flowing through, and produce aerial fog deposit, thereby greatly reduced harmful substance such as tar etc. in the flue gas.

4. The application provides a cigarette filters for cigarette, through the width of controlling first flue gas passageway, can reduce the suction resistance, harmful substance such as tar in the reduction flue gas that simultaneously can the at utmost improves the tar clearance.

5. According to the cigarette filter tip, the ratio of the lengths of the inner shell to the outer shell is set, so that the proportion between the first smoke channel and the second smoke channel is coordinated, the problem that the tar reduction effect is poor due to the fact that the first smoke channel is too short is solved, the problem that the mixing effect between smoke and air is influenced due to the fact that the second smoke channel is too short is avoided, and the effect of reducing the suction resistance cannot be achieved; through setting up the area ratio of advancing cigarette mouth and outlet flue to guarantee into cigarette volume and play cigarette volume, promote user's suction and experience.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic view of a cigarette filter according to an embodiment of the present invention.

List of parts and reference numerals:

1. an outer housing; 2. an inner housing; 3. a smoke outlet; 4. a smoke inlet; 5. a connecting surface; 6. a first flue gas channel; 7. a second flue gas channel; 8. an air inlet.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The cigarette filter of the present application can be applied to any cigarette, such as an electronic cigarette, a conventional cigarette, etc., without limitation, and the following examples illustrate the case of heating a non-burning cigarette, but are not limited to this type.

Example 1

As shown in fig. 1, example 1 of the present application discloses a filter for cigarettes, which includes: the smoke-removing device comprises an outer shell 1 and an inner shell 2 sleeved in the outer shell 1, wherein a cavity between the outer shell 1 and the inner shell 2 forms a smoke channel, two ends of the smoke channel are respectively provided with a smoke outlet 3 and at least one smoke inlet 4, one end of the inner shell 2 is connected with one end of the outer shell 1 through a connecting surface 5, and the smoke inlet 4 is arranged on the connecting surface 5; the smoke passes through the smoke inlet 4 and the smoke channel in sequence and then flows out of the filter tip through the smoke outlet 3. The smoke channel is formed by the cavity between the outer shell 1 and the inner shell 2, smoke enters the filter tip and flows out of the filter tip after passing through the cavity structure, so that the suction resistance is greatly reduced, a certain smoke concentration can be ensured, fragrance components are kept, in addition, the smoke collides the shell wall when flowing through the smoke channel, and aerosol deposition is generated, so that harmful substances such as tar and the like in the smoke are greatly reduced; the smoke inlet 4 is arranged on the connecting surface 5 between the inner shell 2 and the outer shell 1, so that smoke enters the smoke channel through the smoke inlet 4, and the effects of reducing tar and reducing harm are achieved; in addition, the filter tip can be integrally formed, the processing process is simple, and the production efficiency is greatly improved.

The resistance to draw in this embodiment refers to the resistance to draw of the user when drawing smoke.

Specifically, the outer shell 1 is a cylinder matched with the existing cigarette.

Specifically, the shape of the inner housing 2 is not limited in this embodiment, as long as the smoke channel can be formed with the first outer housing, for example, the smoke channel may be a cylinder, a prism, or a pyramid, and the inner housing 2 is a cylinder in this embodiment.

Specifically, the present embodiment does not limit the opening or closing of the end of the inner casing 2 away from the smoke inlet 4. When the mouth is in an open state, smoke enters the smoke channel through the smoke inlet 4, is discharged from the smoke outlet 3 under the action of suction force, and then enters the oral cavity of a user.

As an embodiment, the position of the smoke inlet 4 is not limited in this embodiment as long as the smoke generated in the smoking segment can be guided to the filter.

In one embodiment, an end of the inner housing 2 away from the smoke inlet 4 is a closed end, a buffer chamber is formed inside the inner housing 2, and the smoke inlet 4 is disposed at a connection point between the connection surface 5 and the inner housing 2. Keep away from the one end of advancing mouth 4 through setting up interior casing 2 and be the blind end, and advance mouth 4 and set up the junction between connecting face 5 and interior casing 2, can make partial flue gas get into first flue gas passageway 6 through advancing mouth 4 again after the circulation in the surge chamber, the setting of surge chamber can change the flue gas route, reduces the flue gas temperature, avoids flue gas temperature too high, can make the deposit of grain looks thing in the flue gas in the surge chamber simultaneously, increase the effect that reduces burnt harm.

As an embodiment, the shape of the smoke inlet 4 is not limited in this embodiment, and may be, for example, a triangle, a quadrangle, a circle or an ellipse, as long as the smoke can enter the filter through the smoke inlet 4. Specifically, the smoke inlet 4 is a square with a side length of 0.424 mm.

As an embodiment, the outer shell 1 comprises a first outer shell and a second outer shell which are connected, an annular cavity between the first section of outer shell 1 and the inner shell 2 forms a first flue gas channel 6, and the interior of the second outer shell forms a second flue gas channel 7; the smoke passes through the smoke inlet 4, the first smoke channel 6 and the second smoke channel 7 in sequence and then flows out of the filter tip through the smoke outlet 3. By arranging the first smoke channel 6 and the second smoke channel 7 to be of cavity structures, smoke enters the filter tip and flows out of the filter tip after passing through the cavity structures, so that the suction resistance is greatly reduced, a certain smoke concentration can be ensured, and aroma components are kept; through setting up first flue gas passageway 6 that forms between first outer casing and the interior casing 2, and advance the mouth 4 and communicate with first flue gas passageway 6 to make the flue gas through colliding the casing wall when first flue gas passageway 6 of flowing through, and produce aerial fog deposit, thereby greatly reduced harmful substance such as tar etc. in the flue gas.

In one embodiment, the sidewall of the second housing defines an air inlet 8. The air inlet 8 is formed in the side wall of the second outer shell, so that smoke and air are fully mixed in the second smoke channel 7, the smoke can be diluted, the concentration of carbon monoxide in the smoke is effectively reduced, the air inlet 8 can further reduce suction resistance, the smoke temperature can be reduced, and the temperature is reduced so that particulate matters in the smoke are further deposited on the inner wall of the second smoke channel 7, and harmful substances in the smoke are further reduced.

Specifically, the shape of the air inlet 8 is not limited in this embodiment, and may be, for example, a triangle, a quadrangle, a pentagon, a hexagon, a circle, or an ellipse, as long as the air can enter. Specifically, the shape of air inlet 8 is oval, and the shaping degree of difficulty is low, and the drawing of patterns is easy, and can be higher with laser drilling position overlap ratio, guarantees into the air quantity to further guarantee to reduce and inhale and hinder, coke-reducing and cooling effect.

As an embodiment, the ratio of the distance between the center of the air inlet 8 and the smoke outlet 3 to the length of the outer case 1 is (0.2-0.6): 1. preferably 0.4: 1. through setting up the position of air inlet 8, avoid air inlet 8 to influence the tar effect of falling apart from fuming section too closely, prevent simultaneously that air inlet 8 from reducing the air inlet volume or can't advance the air too closely apart from 3 cigarette outlets, and lead to inhaling to hinder too big, the cooling effect is poor and the higher phenomenon of harmful substance content.

Specifically, the length of the outer case 1 is 3 to 200mm, preferably 3 to 30mm, and more preferably 14mm, and the distance between the center of the air inlet port 8 and the smoke outlet port 3 is 0.1 to 14mm, and preferably 5.6 mm.

In one embodiment, the ratio of the area of the air inlet 8 to the area of the smoke inlet 4 is (50-650): 1, preferably 100-: 1. through controlling the proportion between air inlet 8 and the smoke inlet 4, and then the proportion between the air of control entry oral cavity and the flue gas, guarantee the air to the tar and the cooling effect of flue gas, prevent that the flue gas temperature is too high, guarantee the concentration of flue gas and the richness of fragrance simultaneously, promote user's suction and experience.

Specifically, the area of the air inlet 8 is 4.5-60mm ² Preferably 47.1mm ² The area of the smoke inlet 4 is 0.09-1mm ² Preferably 0.18mm ² 。

As an embodiment, the ratio of the inner diameter of the outer shell 1 to the width of the first flue gas channel 6 is (3-8): 1, preferably 5.39: 1. the width of the first flue gas channel 6 has an important influence on tar removal rate, and the larger the width is, the lower the impact effect of flue gas on the inner wall of the first flue gas channel 6 is, so that the removal effect of harmful substances is not ideal, and when the width of the first flue gas channel 6 is too small, the impact distance between the flue gas and the first flue gas channel 6 is shortened, namely the flow path of the first flue gas channel 6 is shortened, the tar reduction effect is also influenced, and in addition, the suction resistance is increased; therefore, in the embodiment, by controlling the width of the first flue gas channel 6, the suction resistance can be reduced, harmful substances such as tar in the flue gas can be reduced to the greatest extent, and the tar removal rate is improved.

Specifically, the inner diameter of the outer shell 1 is 3-8mm, preferably 5.39mm, the wall thickness of the outer shell 1 is 1mm, the width of the first flue gas channel 6 is 1mm, and the wall thickness of the inner shell 2 is 1 mm.

As an embodiment, the ratio of the lengths of the inner housing 2 and the outer housing 1 is (0.3-0.7): 1. preferably 0.5: 1. Through setting up the length ratio of interior casing 2 and shell body 1, and then coordinate the proportion between first flue gas passageway 6 and the second flue gas passageway 7, prevent that first flue gas passageway 6 from being short and leading to falling burnt effect poor, avoid simultaneously influencing the mixed effect between flue gas and the air because of second flue gas passageway 7 is short, can't play the effect that reduces and inhale the resistance.

In particular, the length of the inner housing 2 is 0.9 to 13mm, preferably 7 mm.

Specifically, the number of the smoke inlets 4 is not limited in this embodiment. Preferably, one end of the smoke channel is provided with two smoke inlets 4, and the two smoke inlets 4 are symmetrically distributed at the connecting position of the connecting surface 5 and the inner shell 2. This mode of setting up can guarantee that flue gas channel is inherent to go up flue gas concentration evenly in the radial direction, improves and falls burnt harmful effect of subtracting, promotes user's suction and experiences.

In one embodiment, the ratio of the area of the smoke outlet 4 to the area of the smoke inlet 3 is (55-145): 1, preferably (90-130): 1, more preferably 126.7: 1. through setting up the area ratio of entering mouth 4 and outlet flue 3 to guarantee into cigarette volume and play cigarette volume, promote the user and smoke and experience.

Specifically, the shape and position of the smoke outlet 3 are not limited in this embodiment as long as the smoke can flow out of the filter. For example, the smoke outlet 3 may be provided at one end of the outer case 1, or may be provided at a side portion of the outer case 1, and when the smoke outlet 3 is provided at one end of the outer case 1, the one end may be entirely opened, or may be partially opened.

In one embodiment, the end of the outer housing 1 remote from the mouthpiece 4 is open to form the mouthpiece 3. Keep away from the whole openings of one end of advancing cigarette mouth 4 through setting up shell body 1 to guarantee the flue gas volume, promote the user and aspirate and experience.

As an embodiment, the outer casing 1 and the inner casing 2 are arranged concentrically. This mode of setting up can guarantee that flue gas channel is inherent to go up flue gas concentration evenly in the radial direction, improves and falls burnt harmful effect of subtracting, promotes user's suction and experiences.

Example 2

Example 2 of the present application provides an electronic cigarette comprising a smoking portion for producing smoke and a filter selected from the filters of example 1 connected together.

Example 3

Example 3 provides a method of making a filter for a cigarette, the filter for a cigarette being the filter of example 1, the method comprising the steps of:

(1) melting raw materials, wherein the raw materials comprise 42 parts of styrene-ethylene-butadiene-styrene block copolymer, 22.5 parts of polypropylene, 35 parts of paraffin oil and 0.5 part of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester;

(2) injection molding, injecting the molten raw materials into a mold by using injection molding equipment, keeping the pressure, cooling and molding to obtain the cigarette filter tip,

wherein the mold temperature is 25 ℃, the feeding temperature of a charging barrel in the injection molding equipment is 170 ℃, the front section temperature is 180 ℃, the rear section temperature is 190 ℃, the nozzle temperature is 210 ℃, the injection pressure is 3MPa, the pressure maintaining pressure is 1.8MPa, the back pressure is 0.7MPa, and the cooling time is not more than 10 s.

Filters 1# -7# and filters D1# -D3# were prepared according to the above method, and the wall thicknesses of the inner shell 2 and the outer shell 1 of the filters 1# -7# and filters D1# -D3# were all 1mm, and the remaining parameters are shown in table 1:

TABLE 1

In addition, the raw materials of the filter are changed to respectively prepare a filter D4# -D6#, wherein the raw materials of D4# comprise 64.5 parts of styrene-ethylene-butadiene-styrene block copolymer, 35 parts of paraffin oil and 0.5 part of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, and the rest conditions are the same as the filter 1 #;

the raw material of D5# comprises 42 parts of styrene-ethylene-butadiene-styrene block copolymer, 22.5 parts of polypropylene and 0.5 part of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, and the rest conditions are the same as those of the filter tip 1 #;

the raw material of D6# was 42 parts of polystyrene, 22.5 parts of polypropylene, 35 parts of paraffin oil and 0.5 part of pentaerythritol tetrakis- [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], with the remaining conditions being the same as those of Filter No. 1 #.

Examples of the experiments

The smoke temperature, tar reduction efficiency, CO reduction efficiency and suction resistance of the smoke outlet 2 of the filter tip 1# -7#, D1# -D3# in example 3 were respectively tested according to the following test methods, and the test results are shown in Table 2:

flue gas temperature at the flue gas outlet 2: the outlet temperature was measured using a thermocouple plug-in.

Coke reduction efficiency: the cigarette with the traditional general acetate fiber filter tip is taken as a first sample, the cigarette with the filter tip in the embodiment 3 is taken as a second sample, the first sample and the second sample are respectively sucked by utilizing the existing rotary disc type smoking machine, and the tar yield is tested, wherein the tar reduction efficiency is (sample two tar yield-sample one tar yield)/sample one tar yield.

CO reduction efficiency: the cigarette with the traditional general acetate fiber filter tip is taken as a first sample, the cigarette with the filter tip in the embodiment 3 is taken as a second sample, the first sample and the second sample are respectively sucked by using the existing rotary disc type smoking machine, the CO content is tested, and the CO reduction efficiency is (the amount of the second sample CO-the amount of the first sample CO)/the amount of the first sample CO.

Absorbing resistance: the detection is carried out through a traditional cigarette comprehensive test bench.

TABLE 2

Numbering	Smoke outlet	2 flue gas temperature (DEG C)	Tar reduction efficiency (%)	CO-decreasing efficiency (%)	Suction resistance (Pa)
						Filter tip 1#	37	45％	60％	650
Filter tip 2#	45	15％	30％	1200
					Filter tip 3#	37	25％	35％	2000
Filter tip 4#	37	12％	15％	1400
					Filter tip 5#	37	23％	15％	2800
Filter tip 6#	45	18％	13％	2800
					Filter tip 7#	40	6％	10％	1300
Filter D1#	50	3％	0％	4000
					Filter D2#	60	0％	0％	700
Filter D3#	58	3％	3％	1500

As can be seen from Table 2, the filter tip prepared by the method has moderate smoke temperature, is suitable for suction, has high tar reduction efficiency and CO reduction efficiency, and greatly reduces harmful substances in smoke; and the suction resistance is low, and the suction experience is good.

In addition, the filter tip 1# -7# and the filter tip D1# -D3# have stable performance and stable aperture in the processing process, and can not generate peculiar smell in the suction process and deform after being sucked; and the filter tip D4# -D5# has unstable pore diameter in the processing process, poor processing performance, peculiar smell in the suction process and poor suction experience, and the deformation phenomenon appears after the suction, which shows that the temperature resistance is poor.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A filter for tobacco rod, comprising: the smoke-discharging device comprises an outer shell and an inner shell sleeved in the outer shell, wherein a cavity between the outer shell and the inner shell forms a smoke channel, two ends of the smoke channel are respectively provided with a smoke outlet and at least one smoke inlet, one end of the inner shell is connected with one end of the outer shell through a connecting surface, and the smoke inlet is arranged on the connecting surface;

2. The filter tip for cigarettes according to claim 1, wherein the end of the inner shell far away from the smoke inlet is a closed end, a buffer chamber is formed inside the inner shell, and the smoke inlet is arranged at the joint between the connecting surface and the inner shell.

3. The filter for cigarettes according to claim 2, wherein the outer housing comprises a first outer housing and a second outer housing connected together, the annular cavity between the first outer housing and the inner housing forming a first smoke passage, the interior of the second outer housing forming a second smoke passage;

4. A filter for cigarettes according to claim 3, characterised in that the ratio of the internal diameter of the outer housing to the width of the first smoke channel is 3-8: 1.

5. a filter as claimed in claim 2, in which the ratio of the length of the inner and outer casings is from 0.3 to 0.7: 1.

6. a cigarette filter according to any one of claims 1 to 5, characterised in that one end of the smoke path is provided with two smoke inlets, the two smoke inlets being evenly distributed across the attachment surface.

7. A filter for cigarettes according to claim 4, characterised in that the ratio of the area of the mouth to the area of the mouth is 55-145: 1.

8. a filter for tobacco rods as claimed in any one of claims 1 to 5, wherein the end of the outer housing remote from the mouth is open to form the mouth.

9. A filter for cigarettes according to any one of claims 1 to 5, characterised in that the outer housing is disposed co-axially with the inner housing.

10. A cigarette comprising a smoking portion for the production of smoke and a filter attached thereto, the filter being selected from the filters of any one of claims 1 to 9.