CN217771419U - Cigarette filter tip and cigarette - Google Patents

Abstract

The application discloses a cigarette filter tip and a cigarette. The filter includes: the deposition part comprises a smoke inlet, a smoke outlet, an outer shell and an inner shell, the inner shell is sleeved in the outer shell, the outer shell comprises a first outer shell and a second outer shell which are connected, a first deposition cavity is formed by a cavity between the first outer shell and the inner shell, a second deposition cavity is formed by a cavity in the second outer shell, the smoke inlet is communicated with the first deposition cavity, the smoke outlet is communicated with the second deposition cavity, and an air inlet is formed in the side wall of the second outer shell; the smoke sequentially passes through the smoke inlet and the first deposition cavity, is mixed with the air flowing in from the air inlet in the second deposition cavity, and finally flows out of the filter tip through the smoke outlet.

Description

Cigarette filter tip and cigarette

Technical Field

The application relates to a cigarette filter tip and a cigarette, and belongs to the technical field of tobacco.

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 highly effective adsorption materials such as active carbon and the like as a core body, so that although more harmful substances can be filtered to a certain extent, the filtering capacity is improved, and the whole absorption resistance of the filter tip is enhanced; in addition, due to the supporting effect of the core, in the process of smoking, 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 feeling, and the suction resistance is increased due to the difficulty in completely avoiding the deformation condition; 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 for cigarette can greatly reduce the suction resistance, ensure a certain smoke concentration and keep the fragrance components; in addition, the harmful substance such as tar etc. in the flue gas that has significantly reduced effectively reduces the concentration of carbon monoxide in the flue gas, and can reduce the flue gas temperature, promotes user's suction and experiences.

According to one aspect of the present application, there is provided a filter for tobacco rods comprising: the deposition part comprises a smoke inlet, a smoke outlet, an outer shell and an inner shell, the inner shell is sleeved in the outer shell, the outer shell comprises a first outer shell and a second outer shell which are connected, a first deposition cavity is formed by a cavity between the first outer shell and the inner shell, a second deposition cavity is formed by a cavity in the second outer shell, the smoke inlet is communicated with the first deposition cavity, the smoke outlet is communicated with the second deposition cavity, and an air inlet is formed in the side wall of the second outer shell;

the smoke sequentially passes through the smoke inlet and the first deposition cavity, is mixed with the air flowing in from the air inlet in the second deposition cavity, and finally flows out of the filter tip through the smoke outlet.

Optionally, the filter house includes the portion of straining just and strains the portion again, just strain the portion with the deposit portion is close to the one end of advancing the mouth links to each other, strain again the portion with the deposit portion is close to the one end of outlet flue links to each other.

Optionally, the ratio of the lengths of the primary filter section, the sedimentation section and the secondary filter section is (1.2-1.5): 1: (0.5-1.5).

Optionally, a ratio of a distance between a center of the air inlet and the smoke outlet to the outer housing length is (0.2-0.6): 1; and/or

The ratio of the area of the air inlet to the area of the smoke inlet is (50-650): 1.

optionally, the shape of the air inlet is selected from one of a triangle, a quadrangle, a pentagon, a hexagon, a circle, and an ellipse.

Optionally, one end of the inner casing close to the smoke outlet is a closed end, a buffer chamber is formed inside the inner casing, and the smoke inlet is arranged at a joint between the first outer casing and the inner casing or a side wall of the inner casing.

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

optionally, the ratio of the inner diameter of the outer shell to the width of the first deposition chamber is (3-8): 1.

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

according to another aspect of the present application there is provided a cigarette comprising a smoking portion for the production of smoke and a filter selected from any one of the filters described above in association with the smoking portion.

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. according to the cigarette filter tip, the first deposition cavity and the second deposition cavity 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; a first deposition cavity is formed between the first outer shell and the inner shell, and the smoke inlet is communicated with the first deposition cavity, so that smoke collides with a shell wall when flowing through the first deposition cavity to generate aerosol deposition, and harmful substances such as tar and the like in the smoke are greatly reduced; in addition, an air inlet is formed in the side wall of the second outer shell, so that the smoke and the air are fully mixed in the second deposition cavity, the smoke can be diluted, the concentration of carbon monoxide in the smoke is effectively reduced, the air inlet can further reduce the suction resistance and can reduce the temperature of the smoke, and the temperature is reduced, so that particulate matters in the smoke are further deposited on the inner wall of the second deposition cavity, and harmful substances in the smoke are further reduced. The filter house and the cooperation of deposit portion that set up, the filter house can filter the flue gas that gets into the deposit portion or the flue gas that flows from the deposit portion, further reduces harmful substance and foreign particles in the flue gas, improves the cleanliness of flue gas when not reducing aroma composition in the flue gas, and then improves user's use sense.

2. The application provides a cigarette filters for cigarette, the portion of straining sets up the one end at the deposit portion to be close to into the mouth, the flue gas after the portion of straining filters from advancing the mouth inflow deposit portion, strain the portion setting again at the other end of deposit portion, and be close to the mouth of a cigarette, strain the portion again and be used for filtering the flue gas that flows out from the deposit portion. The portion of straining just that sets up can carry out prefiltration to the flue gas that gets into the deposit intracavity, and the impurity particle in the flue gas is most remained in just straining, strains the portion again and then filters the cleanliness factor of flue gas through deposit portion back flue gas once more, further improvement flue gas.

3. According to the filter tip for the cigarette, the length of the primary filter part is longest, larger impurities in smoke can be blocked, the impurity content of the smoke in the deposition part is reduced, the smoke inlet is prevented from being blocked by the impurities, the smoke can freely move in the deposition part, the collision degree of the smoke in the deposition part is further improved, and harmful substances in the smoke are adhered in the deposition part; the clamping of user is convenient for to shorter portion of straining again, can also further filter the flue gas simultaneously, improves the tar reduction of filter tip and subtracts the harmful effect.

4. The application provides a cigarette filters for, through setting up the position of air inlet, avoid air inlet to influence the tar effect of falling apart from fuming section too closely, prevent simultaneously that air inlet from reducing the air inlet or can't advance the air apart from the cigarette outlet is too close, and lead to that the suction resistance is too big, the cooling effect is poor and the higher phenomenon of harmful substance content.

5. The application provides a cigarette filters for cigarette advances the air mouth and advances the proportion between the mouth through control, and then the control advances the air of oral cavity and the proportion between the flue gas, guarantees the air and to the tar and the cooling effect of flue gas, prevents that the flue gas temperature is too high, guarantees the concentration of flue gas and the richness of fragrance simultaneously, promotes user's suction and experiences.

6. The application provides a cigarette filter tip, one end that is close to the outlet flue through setting up the interior casing is the blind end, and advance the lateral wall department of the junction of cigarette mouth setting between first shell body and interior casing or interior casing, can make partial flue gas get into first deposit chamber through advancing the cigarette 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 the 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.

7. According to the cigarette filter tip, the width of the first deposition cavity has an important influence on tar removal rate, the larger the width is, the lower the impact effect of smoke on the inner wall of the first deposition cavity is, so that the harmful substance removal effect is not ideal, and when the width of the first deposition cavity is too small, the impact distance between the smoke and the first deposition cavity can be shortened, namely the flow path of the first deposition cavity is shortened, the tar reduction effect can be influenced, and in addition, the suction resistance can be increased; therefore, the embodiment can reduce the suction resistance by controlling the width of the first deposition cavity, and can reduce harmful substances such as tar in the flue gas to the maximum extent and improve the tar removal rate.

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 cross-sectional view of a tobacco rod filter according to example 1 of the present application;

FIG. 2 is a schematic view of an embodiment of a deposition portion according to example 1 of the present application;

FIG. 3 is a schematic view of another embodiment of a deposition portion according to example 1 of the present application;

fig. 4 is a schematic view of a cigarette related to embodiment 2 of the present application.

List of parts and reference numerals:

1. a deposition section; 11. a smoke inlet; 12. a smoke outlet; 13. an outer housing; 14. an inner housing; 15. an air inlet; 16. adsorbing the particles; 17. flavouring particles; 2. a primary filtering part; 3. a refiltering part; 4. a smoke generating portion.

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 below 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 or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken 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 to implicitly indicate 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 can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. 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 filter for cigarette in the present application may be applied to any cigarette, such as an electronic cigarette, a traditional cigarette, etc., without limitation.

Example 1

As shown in fig. 1 to 3, example 1 of the present application discloses a filter for cigarettes, which includes: the deposition part 1 comprises a smoke inlet 11, a smoke outlet 12, an outer shell 13 and an inner shell 14 sleeved inside the outer shell 13, the outer shell 13 comprises a first outer shell and a second outer shell which are connected, a first deposition cavity is formed by a cavity between the first outer shell and the inner shell 14, a second deposition cavity is formed by a cavity inside the second outer shell, the smoke inlet 11 is communicated with the first deposition cavity, the smoke outlet 12 is communicated with the second deposition cavity, and an air inlet 15 is formed in the side wall of the second outer shell; the smoke passes through the smoke inlet 11 and the first deposition cavity in sequence, is mixed with the air flowing in from the air inlet 15 in the second deposition cavity, and finally flows out of the filter tip through the smoke outlet 12.

By arranging the first deposition cavity and the second deposition cavity to be both in a cavity structure, smoke enters the filter tip and then flows out of the filter tip after passing through the cavity structure, so that the smoke resistance is greatly reduced, a certain smoke concentration can be ensured, and aroma components are kept; a first deposition cavity is formed between the first outer shell and the inner shell 14, and the smoke inlet 11 is communicated with the first deposition cavity, so that smoke collides with the shell wall when flowing through the first deposition cavity to generate aerosol deposition, and harmful substances such as tar and the like in the smoke are greatly reduced; in addition, through having seted up air inlet 15 at the lateral wall of second shell body, make flue gas and air at second deposit intracavity intensive mixing, can dilute the flue gas, effectively reduce the concentration of carbon monoxide in the flue gas, air inlet 15 can also further reduce the resistance to suction, and can reduce the flue gas temperature, and the temperature reduces makes the further deposit of particulate matter in the flue gas on the inner wall in second deposit chamber, further reduces the harmful substance in the flue gas. The filter house that sets up and the cooperation of deposit portion 1, the filter house can filter the flue gas that gets into deposit portion 1 or the flue gas that flows out from deposit portion 1, further reduces harmful substance and foreign particles in the flue gas, improves the cleanliness of flue gas when not reducing aroma composition in the flue gas, and then improves user's use and feels.

The resistance to draw in this embodiment refers to the resistance to draw when a user draws smoke.

Specifically, the shape of the air inlet 15 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, air inlet 15's shape 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 contact ratio, guarantees the air inlet volume to further guarantee to reduce to inhale and hinder, reduce burnt and the cooling effect.

Specifically, the outer casing 13 is a cylinder adapted to the existing cigarette.

Specifically, the shape of the inner housing 14 in this embodiment is not limited as long as the first deposition chamber can be formed with the first outer housing, and may be, for example, a cylinder, a prism, a pyramid, or the like, where the inner housing 14 in this embodiment is a cylinder.

Specifically, the filter house can set up the one end at deposit portion 1, also can set up the both ends at deposit portion 1, as long as guarantee that the filter house can cooperate with deposit portion 1, carry out double filtration to the flue gas can.

As an implementation mode, the filtering part comprises a primary filtering part 2 and a secondary filtering part 3, the primary filtering part 2 is connected with one end of the deposition part 1 close to the smoke inlet 11, and the secondary filtering part 3 is connected with one end of the deposition part 1 close to the smoke outlet 12. The portion 2 that just strains sets up the one end at deposit portion 1 to be close to into mouth 11, the flue gas after the portion 2 filters is just strained from advancing mouth 11 inflow deposit portion 1, strain the portion 3 setting again at the other end of deposit portion 1, and be close to outlet 12, strain portion 3 again and be used for filtering the flue gas that flows out from deposit portion 1. The portion 2 of straining just that sets up can carry out prefiltering to the flue gas that gets into the deposit intracavity, and the impurity particle in the flue gas is most to remain in just straining portion 2, and it is again to filtering through 1 back flue gas of deposit portion that portion 3 is strained again, further improves the cleanliness factor of flue gas again.

As an embodiment, the ratio of the lengths of the primary filter section 2, the sedimentation section 1 and the secondary filter section 3 is (1.2-1.5): 1: (0.5-1.5), preferably 1.2. The primary filter part 2 is longest in length, so that larger impurities in the smoke can be blocked, the impurity content of the smoke in the deposition part 1 is reduced, the smoke inlet 11 is prevented from being blocked by the impurities, the smoke can freely move in the deposition part 1, the collision degree of the smoke in the deposition part 1 is further improved, and harmful substances in the smoke are adhered in the deposition part 1; the shorter refilter 3 is convenient for the user to clamp, and can further filter the smoke at the same time, thus improving the tar and harm reducing function of the filter tip.

In one embodiment, the prefilter section 2 and the refilter section 3 are acetate filter rods, and adsorbent particles 16 are provided in the acetate filter rods. The acetate fiber filter stick has small suction resistance, is beneficial to the passing of smoke, can also block impurity particles in the smoke, and can reduce the loss of aroma components in the smoke while filtering harmful substances in the smoke. In addition, aroma-increasing particles 17 can be arranged in the acetate fiber filter stick to increase aroma in smoke, the aroma-increasing particles 17 are preferably particles made of tobacco powder and an adhesive, the smoke temperature is generally higher, when the higher smoke contacts the particles made of the tobacco powder and the adhesive, the tobacco powder can absorb heat of the smoke, the smoke is cooled, and meanwhile aerosol can be released to increase aroma of the smoke.

As an embodiment, the ratio of the distance between the center of the air inlet 15 and the smoke outlet 12 to the length of the outer case 13 is (0.2-0.6): 1, preferably 0.4:1. through setting up the position of air inlet 15, avoid air inlet 15 to influence the tar reduction effect apart from fuming section too closely, prevent simultaneously that air inlet 15 from reducing the air inlet volume or can't advance the air apart from smoke outlet 12 too closely, and lead to that the suction resistance is too big, the cooling effect is poor and harmful substance content is higher phenomenon.

Specifically, the length of the outer case 13 is 3 to 200mm, preferably 3 to 30mm, preferably 14mm, and the shortest distance between the center of the air inlet 15 and the smoke outlet 12 is 0.1 to 14mm, preferably 5.6mm.

As an embodiment, the ratio of the area of the air inlet 15 to the area of the smoke inlet 11 is (50-650): 1, preferably 100 to 400, more preferably 261:1. through controlling the proportion between air inlet 15 and the inlet smoke 11, and then control the proportion between air and the flue gas of entering the oral cavity, 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 15 is 4.5-60mm ² Preferably 47.1mm ² The area of the smoke inlet 11 is 0.09-1mm ² Preferably 18mm ² 。

Specifically, the present embodiment is not limited to the open state or the closed state of the end of the inner housing 14 close to the smoke outlet 12. When the device is in an open state, smoke enters the first deposition cavity through the smoke inlet 11, is discharged from the smoke outlet 12 through the second deposition cavity under the action of suction force, and then enters the oral cavity of a user.

As an embodiment, the position of the smoke inlet 11 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, one end of the inner housing 14 near the smoke outlet 12 is a closed end, the inner housing 14 forms a buffer chamber inside, and the smoke inlet 11 is disposed at the connection between the first outer housing and the inner housing 14 or at the side wall of the inner housing 14. Through setting up the one end that interior casing 14 is close to outlet flue 12 to be the blind end, and inlet flue 11 sets up the junction between first shell body and interior casing 14 or the lateral wall department of casing 14 in, can make partial flue gas get into first deposit chamber through inlet flue 11 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 the 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 burnt harm.

As shown in fig. 3, preferably, the smoke inlet 11 is provided at a side wall of the inner housing 14. The flue gas firstly enters the buffer chamber under the action of negative pressure, then reversely stays at the position of the flue gas inlet 11, and flows out of the flue gas inlet 11 to the first deposition cavity, so that the flow path of the flue gas in the buffer chamber is prolonged, the retention time of the flue gas in the buffer chamber is prolonged, and the retention rate of harmful components is improved.

As an embodiment, the ratio of the length of inner housing 14 to outer housing 13 is (0.3-0.7): 1. preferably 0.5. Through setting up the length ratio of interior casing 14 and shell body 13, and then coordinate the proportion between first deposit chamber and the second deposit chamber, prevent that first deposit chamber from being too short and leading to falling burnt effect poor, avoid simultaneously influencing the mixed effect between flue gas and the air because of the second deposit chamber is too short, can't play the effect that reduces the suction resistance.

In particular, the length of the inner housing 14 is 0.9-13mm, preferably 7mm.

As an embodiment, the ratio of the inner diameter of the outer shell 13 to the width of the first deposition chamber is (3-8): 1, preferably 5.39:1. the width of the first deposition cavity has an important influence on tar removal rate, the larger the width is, the poor impact effect of the flue gas on the inner wall of the first deposition cavity is, so that the removal effect of harmful substances is not ideal, and when the width of the first deposition cavity is too small, the impact distance between the flue gas and the first deposition cavity is shortened, namely the flow path of the first deposition cavity is shortened, the tar reduction effect is also influenced, and in addition, the suction resistance is increased; therefore, the embodiment can reduce the suction resistance by controlling the width of the first deposition cavity, and can reduce harmful substances such as tar in the flue gas to the maximum extent and improve the tar removal rate.

Specifically, the inner diameter of the outer shell 13 is 2-8mm, preferably 5.39mm, the wall thickness of the outer shell 13 is 1mm, the width of the first deposition chamber is 1mm, and the wall thickness of the inner shell 14 is 1mm.

As an embodiment, the ratio of the area of the smoke outlet 12 to the area of the smoke inlet 11 is (55-145): 1, preferably (90-130): 1, more preferably 126.7:1. through setting up the area ratio of advancing cigarette mouth 11 and outlet flue 12 to guarantee into cigarette volume and play cigarette volume, promote user's suction and experience.

Specifically, the shape and position of the smoke outlet 12 are not limited in this embodiment, as long as smoke can flow out of the filter. For example, the smoke outlet 12 may be provided at one end of the outer case 13, or may be provided at a side portion of the outer case 13, and when the smoke outlet 12 is provided at one end of the outer case 13, the one end may be entirely open, or may be partially open.

In one embodiment, the end of the outer housing 13 remote from the mouthpiece 11 is open to form the mouthpiece 12. Keep away from the whole openings of one end of advancing cigarette mouth 11 through setting up shell body 13 to guarantee the flue gas volume, promote user's suction and experience.

Example 2

As shown in fig. 4, example 2 of the present application provides a cigarette comprising a joined smoking portion 4 for producing smoke and a filter selected from the filters of example 1. The cigarette can be a traditional cigarette or an electronic cigarette. Preferably a conventional cigarette. During smoking, the smoke of the cigarette is effectively intercepted when passing through the cigarette filter, and harmful components in the smoke entering the mouth cavity are greatly reduced.

The present embodiment does not limit the types of cigarettes, as long as the cigarettes can be connected and matched with the cigarette filters in embodiment 1, for example, the cigarettes may be thin cigarettes or thick cigarettes, and specifically, the circumference of each cigarette may be 17-50cm.

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, as for the system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points.

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 or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims (10)

1. A cigarette filter, comprising: the filter house and the deposit portion that link to each other, the deposit portion is established including advancing mouth, outlet flue, shell body and cover the inside interior casing of shell body, the shell body is including the first shell body and the second shell body that link to each other, first shell body with cavity between the interior casing forms first deposit chamber, the inside cavity of second shell body forms second deposit chamber, advance the mouth with first deposit chamber intercommunication, the outlet flue with second deposit chamber intercommunication, air inlet has been seted up to the lateral wall of second shell body.

2. The cigarette filter according to claim 1, wherein the filter portion comprises a primary filter portion and a secondary filter portion, the primary filter portion is connected with one end of the deposition portion close to the smoke inlet, and the secondary filter portion is connected with one end of the deposition portion close to the smoke outlet.

3. A tobacco rod filter as claimed in claim 2, wherein the ratio of the lengths of the primary, deposition and refiltering sections is (1.2-1.5): 1: (0.5-1.5).

4. A rod filter according to any one of claims 1 to 3, wherein the ratio of the distance between the centre of the air inlet and the smoke outlet to the length of the outer housing is (0.2-0.6): 1; and/or

The ratio of the area of the air inlet to the area of the smoke inlet is (50-650): 1.

5. a rod filter according to any one of claims 1 to 3, wherein the air inlet openings have a shape selected from one of triangular, quadrilateral, pentagonal, hexagonal, circular and elliptical.

6. A cigarette filter according to any one of claims 1 to 3, wherein the end of the inner housing adjacent the outlet is closed, a buffer chamber is formed within the inner housing, and the inlet is provided at the junction between the first outer housing and the inner housing or at the side wall of the inner housing.

7. A cigarette filter as in claim 1, wherein the ratio of the length of the inner housing to the outer housing is (0.3-0.7): 1.

8. a tobacco filter according to any one of claims 1 to 3, wherein the ratio of the internal diameter of the outer housing to the width of the first deposition chamber is (3-8): 1.

9. a tobacco filter according to any one of claims 1 to 3, wherein the ratio of the area of the mouth outlet to the area of the mouth inlet is (55-145): 1.

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

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