Tar-reducing and harm-reducing cigarette filter tip

Abstract

A cigarette filter capable of reducing tar and harm relates to the technical field of cigarettes and comprises a forming paper layer (1) and a composite filter element, a rotary filter stick section (2) is arranged in the composite filter element and comprises an inner cylinder (3), a middle cylinder (4) and an outer cylinder (5), the rotary cylinders are sequentially stacked and sleeved together from inside to outside and from small to large, annular gaps are reserved among the rotary cylinders, and the outer cylinder is arranged in the forming paper layer (1). The two ends of the inner cylinder (3) are open, one end of the inner cylinder (3) and one end of the outer cylinder (5) are closed through an annular piece (6), a gap is reserved between the annular piece (6) and the end of the middle cylinder (4), the other end of the middle cylinder (4) is flush with the non-closed end of the outer cylinder (5) and is closed through a round piece (7), a gap is reserved between the round piece (7) and the end of the inner cylinder (3), and filter materials are filled among the rotary cylinders. Under the limited length, the smoke flowing path is effectively prolonged, the capacity of the filter tip for absorbing tar and settling harmful substances is improved, and the filter tip has a better tar and harm reducing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarettes, in particular to a cigarette filter with good tar reduction and harm reduction effects. Background Art

[0002] A cigarette filter is an important part of a cigarette and can filter the smoke. The cigarette filter can filter out most of the tar in the cigarette and reduce the intake of harmful substances such as tar by smokers. However, limited by the length of the cigarette, the length of the filter part is also very limited, which makes the path length of the smoke flowing through the filter part very short. In order to achieve better tar reduction and harm reduction effects within a limited length, the commonly used methods at present are generally to increase the density of the filter element or to add a functional filter rod section with special carriers such as activated carbon. Increasing the density of the filter element can only be carried out under appropriate conditions, otherwise the suction resistance will become larger and affect the smoking experience. Adding carriers such as activated carbon will change the taste of the cigarette and thus affect the smoking flavor. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a cigarette filter that can achieve tar reduction and harm reduction effects by effectively extending the smoke path on the premise of keeping the length of the filter unchanged.

[0004] The technical solution of the utility model is: a tar-reducing and harm-reducing cigarette filter, including a forming paper layer and a composite filter element. A rotary filter rod section is provided in the composite filter element. The rotary filter rod section includes three rotary cylinders, namely an inner cylinder, a middle cylinder and an outer cylinder. The rotary cylinders are nested together in sequence from small to large from inside to outside. There are annular gaps between the rotary cylinders. Both ends of the inner cylinder are open. One end of the inner cylinder and the outer cylinder is closed by an annular sheet. There is a gap between the annular sheet and the end of the middle cylinder. The other end of the middle cylinder is flush with the non-closed end of the outer cylinder and is closed by a round sheet. There is a gap between the round sheet and the end of the inner cylinder. Filter materials are filled between the rotary cylinders.

[0005] The technical effect of the utility model is: within a limited length, the path of the smoke flow is effectively extended, the ability of the filter to absorb tar and settle harmful substances is increased, and the filter has a better tar reduction and harm reduction effect. The cavity part uses air specific flow filtration, and the tar content is reduced by controlling the air flow velocity. The velocity of the smoke will increase when passing through the micropores, and will decrease when passing through the cavity in the cigarette filter. The filter material at the outlet also has a microporous structure. The smoke will stay briefly in the cavity, and tar will have a higher probability of adhering to the inner wall of the cavity. The soot in the smoke will also be more likely to land in the cavity during deceleration and form a mixture with the tobacco tar. In this way, a large amount of harmful substances will be intercepted in the cavity. Description of the Drawings

[0006] Figure 1 It is a structural schematic diagram of the utility model. Detailed implementation mode

[0007] As Figure 1 shown, a cigarette filter tip for reducing tar and harm includes a forming paper layer 1 and a composite filter element. A rotary filter rod section 2 is provided in the composite filter element. The rotary filter rod section 2 includes three rotary cylinders, namely an inner cylinder 3, a middle cylinder 4, and an outer cylinder 5. The rotary cylinders are nested together in sequence from inside to outside, with the smallest at the innermost and the largest at the outermost, and there are annular gaps between the rotary cylinders. Both ends of the inner cylinder 3 are open. One end of the inner cylinder 3 and the outer cylinder 5 is closed by an annular piece 6, and there is a gap between the annular piece 6 and the end of the middle cylinder 4. The other end of the middle cylinder 4 is flush with the non-closed end of the outer cylinder 5 and is closed by a circular piece 7, and there is a gap between the circular piece 7 and the end of the inner cylinder 3. Filter materials are filled between the rotary cylinders, and the closed end faces and the rotary cylinders together form a circuitous flue gas passage. Flue gas flows in from one end of the rotary filter rod section, passes through the tortuous passage, and the flowing path is magnified by two times, so that the filtering effect is enhanced. The density of the filter materials filled between the rotary cylinders can be appropriately reduced without affecting the draw resistance.

[0008] The non-closed end of the outer cylinder 5 is arranged at the near-cigarette end.

[0009] The barrel cavity of the inner cylinder 3 is a cavity, and a number of through holes 8 through which flue gas can pass are distributed on the barrel wall of the inner cylinder 3. Flue gas first enters through the outer cylinder. After the first rotation, part of the flue gas flows into the inner cylinder through the middle cylinder and the end face of the inner cylinder, and the other part of the flue gas enters the inner cylinder through the through holes on the barrel wall. The size of the through holes should be as small as possible to achieve the micro-hole speed regulation effect of accelerating the flow of local flue gas.

[0010] There is at least one row of through holes 8 on the barrel wall of the inner cylinder 3, and the through holes are distributed in a ring around the barrel wall.

[0011] The through holes 8 are arranged at the middle position. The middle position is more conducive to the cavity deposition effect. The flue gas entering from the end of the inner cylinder and the flue gas entering through the through holes converge together and interfere with each other, resulting in a turbulent flow phenomenon, which is more conducive to the sedimentation of flue gas.

[0012] The composite filter element is arranged behind the rotary filter rod section 2, that is, there is at least one section of two-acetate fiber tow section 9 at the near-lip end.

[0013] The composite filter element is arranged in front of the rotary filter rod section 2, that is, there is at least one section of functional filter rod section 10 at the near-cigarette end.

Claims

1. A tar-reducing and harm-reducing cigarette filter, comprising a forming paper layer (1) and a composite filter element, characterized in that: The composite filter element is provided with a rotary filter rod section (2), which comprises three rotary cylinders, namely an inner cylinder (3), a middle cylinder (4) and an outer cylinder (5). The rotary cylinders are stacked together in sequence from the inside to the outside and from small to large, with an annular gap left between the rotary cylinders. The inner cylinder (3) is open at both ends, and the inner cylinder (3) and the outer cylinder (5) are closed at one end by an annular sheet (6). A gap is left between the annular sheet (6) and the end of the middle cylinder (4). The other end of the middle cylinder (4) is flush with the non-closed end of the outer cylinder (5) and is closed by a disc (7). A gap is left between the disc (7) and the end of the inner cylinder (3), and filter material is filled between the rotary cylinders.

2. The tar-reducing and harm-reducing cigarette filter according to claim 1, characterized in that: The non-closed end of the outer cylinder (5) is arranged at the smoke-proximal end.

3. The tar-reducing and harm-reducing cigarette filter according to claim 2, characterized in that: The cylinder cavity of the inner cylinder (3) is a hollow cavity, and a plurality of through holes (8) through which smoke can pass are distributed on the cylinder wall of the inner cylinder (3).

4. The tar-reducing and harm-reducing cigarette filter according to claim 3, characterized in that: The through holes (8) on the wall of the inner cylinder (3) are at least in one row, and the through holes are distributed in a ring shape around the wall of the cylinder.

5. The tar-reducing and harm-reducing cigarette filter according to claim 4, characterized in that: The through hole (8) is arranged at a middle position.

6. The tar-reducing and harm-reducing cigarette filter according to claim 1, characterized in that: The composite filter element is arranged behind the rotary filter rod segment (2) and is provided with at least one diacetate fiber bundle segment (9).

7. The tar-reducing and harm-reducing cigarette filter according to any one of claims 1 to 6, characterized in that: The composite filter element is arranged in front of the rotating filter rod segment (2) and is provided with at least one functional filter rod segment (10).

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