Special-shaped filter stick and filter tip with annular hole channels

Abstract

The utility model belongs to the technical field of cigarette auxiliary materials, and relates to a special-shaped filter stick with annular pore passages, a plurality of annular cavities are uniformly arranged around the central axis of the filter stick, and the annular pore passages are formed by the annular cavities and filter paper along the circumferential wall of the filter stick; a plurality of central cavities are formed along the central axis, the rest part is a tow filling area, and the end, close to the lip, of the filter stick and the end, close to the cut tobacco, of the filter stick are solid cylinders or non-solid cylinders. The utility model further discloses a filter tip provided with the special-shaped filter stick with the annular hole channel. According to the special-shaped filter stick with the annular hole channels, the principle that smoke moves towards a low-suction-resistance area is utilized, transverse movement of the smoke in the filter stick is increased, the probability that harmful substances in the smoke are intercepted and adsorbed by tow fibers is increased, and therefore the harmfulness of the smoke is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of cigarette auxiliary materials and relates to a filter rod, in particular to a special-shaped filter rod with an annular hole and a filter tip. Background Art

[0002] Cigarettes are made of tobacco segments and filter segments connected by tipping paper. The function of the filter is to filter harmful components in the smoke and reduce the harmfulness of the smoke. Currently, the most commonly used harm-reduction filter rods are granular harm-reduction filter rods. This is done by adding particles with strong adsorption capacity, such as activated carbon, zeolite, and other porous materials, to the filter rod to improve the adsorption capacity of the filter rod. However, the particles added to granular harm-reduction filter rods basically do not have selective adsorption capacity. Therefore, while adsorbing harmful substances, they also absorb a large amount of aroma-causing substances and moisture in the smoke, resulting in negative effects such as low smoke aroma concentration and dry smoke.

[0003] Filter rods are made of cellulose acetate tow, with plasticizer evenly sprayed on the tow surface. The plasticizer reacts with the cellulose acetate tow to form a three-dimensional mesh structure, making the filter rod itself a porous adsorption component with a large specific surface area. However, because currently used filter rods are cylindrical with a highly uniform interior, the movement caused by the rod in the filter rod can be roughly considered as linear motion along the central axis of the filter rod. This results in the adsorption capacity of the porous filter rod not being fully utilized, which is why granular harm reduction filter rods are used. If the smoke can undergo a large amount of non-axial movement in the filter rod, the adsorption capacity of the rod can be improved.

[0004] The special-shaped filter rod with an annular channel disclosed by the utility model causes a large amount of non-axial movement of the smoke in the filter rod through the innovative design of the filter rod structure, and does not require the addition of auxiliary adsorption materials. This not only improves the adsorption capacity of the filter rod, but also does not adsorb a large amount of moisture in the smoke, thus maintaining the smoothness of the smoke. Summary of the Invention

[0005] The purpose of the utility model is to disclose a special-shaped filter rod with an annular hole, which not only improves the adsorption capacity of the filter rod, but also can keep the smoothness of the smoke, and also has the function of regulating the smoke and reducing the temperature of the smoke.

[0006] Technical Solution

[0007] A special-shaped filter rod with an annular channel, wherein a plurality of annular cavities are evenly arranged around the central axis of the filter rod, and the annular cavities form an annular channel with the filter paper along the circumferential wall of the filter rod; a plurality of central cavities are provided along the central axis, and the rest is a tow filling area; the near-lip end and the near-tobacco end of the filter rod are solid cylinders or non-solid cylinders.

[0008] In a preferred disclosed embodiment of the present invention, the depth of the annular channel is not greater than the radius of the filter rod.

[0009] In a preferred disclosed example of the present invention, the central cavity is spherical or spindle-shaped.

[0010] Furthermore, when the central cavity is spherical, the radius of the sphere is not greater than the radius of the filter rod.

[0011] Furthermore, when the central cavity is spindle-shaped, when it is arranged along the length direction of the central axis of the filter rod, the base circle diameter does not exceed the diameter of the filter rod.

[0012] Furthermore, when the central cavity is spindle-shaped, when it is arranged perpendicular to the central axis of the filter rod, its base circle diameter and overall length do not exceed the diameter of the filter rod.

[0013] In a preferred disclosed embodiment of the present invention, the diameter of the filter rod is between 4.5 and 8.5 mm.

[0014] The second purpose of the utility model is to disclose a filter tip with a length of 15 to 60 mm after the cigarette is inserted.

[0015] The special-shaped filter rod with annular channels disclosed in the present application has a plurality of annular channels surrounding the central axis of the filter rod on its outer wall. The principle that fluid flows to areas with low resistance is utilized to allow the flue gas to fully contact the tow fibers. When the flue gas moves in the filter rod, it will automatically converge to the area with low resistance, i.e., the cavity area, so that the flue gas continuously shuttles non-axially in the filter rod, and harmful substances are intercepted and adsorbed by the tow fibers in large quantities, thereby improving the adsorption capacity of the filter rod and reducing the harmfulness of the flue gas.

[0016] Beneficial effects

[0017] The special-shaped filter rod with an annular channel disclosed in the utility model utilizes the principle that smoke moves toward the low suction resistance area, greatly increasing the lateral movement of smoke in the filter rod and increasing the probability that harmful substances in the smoke are intercepted and adsorbed by the tow fibers, thereby reducing the harmfulness of the smoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 . Schematic diagram of the cross-section of a special-shaped filter rod with an annular channel, where the names of the components are:

[0019] 1. Annular cavity, 2. Tow-filled area, 3. Central cavity. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the embodiments so that those skilled in the art can better understand the present invention. However, the present invention is not limited to the following embodiments.

[0021] Example 1

[0022] A special-shaped filter rod with an annular channel, with a length of 30mm and a diameter of 7.65mm. Three spherical cavities 3 with a radius of 2.1mm are provided along the central axis. The outer wall has three annular cavities 1 and forms an annular channel with the filter paper. The channel depth is 3mm. The near-lip end and the near-tobacco end of the filter rod are solid cylinders.

[0023] Recorded as test sample 1.

[0024] Example 2

[0025] A special-shaped filter rod with an annular channel, with a length of 30 mm and a diameter of 7.65 mm. Three spherical cavities 3 with a radius of 2.1 mm are provided along the central axis. The outer wall has three annular cavities 1 and forms an annular channel with the filter paper. The channel depth is 2.5 mm. The near-lip end and the near-tobacco end of the filter rod are solid cylinders.

[0026] Recorded as test sample 2.

[0027] Example 3

[0028] A special-shaped filter rod with an annular channel, with a length of 30 mm and a diameter of 7.65 mm, wherein a spindle-shaped central cavity 3 is provided along the length direction of the central axis, with a base circle diameter of 3.0 mm and a length of 10.0 mm. The outer wall has three annular cavities 1 and forms an annular channel with the filter paper. The channel depth is 3 mm. The near-lip end and the near-tobacco end of the filter rod are solid cylinders.

[0029] Recorded as test sample 3.

[0030] Example 4

[0031] A special-shaped filter rod with an annular channel, with a length of 30mm and a diameter of 7.65mm. Two spindle-shaped central cavities 3 are provided in the vertical direction along the central axis, with a base circle diameter of 2.0mm and a length of 4.5mm. The outer wall has three annular cavities 1 and forms an annular channel with the filter paper. The channel depth is 3mm. The near-lip end and the near-tobacco end of the filter rod are solid cylinders.

[0032] Recorded as test sample 4.

[0033] Example 5

[0034] A special-shaped filter rod with an annular channel, with a length of 30 mm and a diameter of 7.65 mm, wherein three spherical cavities 3 with a radius of 2.1 mm are provided along the central axis, and two annular cavities 1 are provided on the outer wall to form an annular channel with the filter paper, and the channel depth is 2.0 mm. The lip end and the tobacco end of the filter rod are solid cylinders.

[0035] Recorded as test sample 5.

[0036] The above-mentioned filter rods were used as test samples, and ordinary acetate filter rods of the same specifications were used as control samples. The tar content in the flue gas was used as the characteristic harm reduction indicator. The tar content in the flue gas was tested after rolling and splicing cigarettes (filter length 30mm, cigarette length 54mm).

[0037] The test results are shown in Table 1.

[0038] Table 1 Tar test results

[0039] sample Tar content in flue gas / mg Decrease / % Test sample 1 7.6 27.62 Test sample 2 7.8 25.71 Test sample 3 7.5 28.57 Test sample 4 7.9 24.76 Test sample 5 7.7 26.67 Control 10.5 --

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A special-shaped filter rod with an annular channel, characterized in that: A plurality of annular cavities (1) are evenly arranged around the central axis of the filter rod, and the annular cavities (1) form an annular channel with the filter paper along the circumferential wall of the filter rod; a plurality of central cavities (3) are arranged along the central axis, and the remaining portion is a tow filling area (2); the near-lip end and the near-tobacco end of the filter rod are solid cylinders or non-solid cylinders.

2. The special-shaped filter rod with an annular hole according to claim 1, characterized in that: The depth of the annular channel is no greater than the radius of the filter rod.

3. The special-shaped filter rod with an annular hole according to claim 1, characterized in that: The central cavity (3) is spherical or spindle-shaped.

4. The special-shaped filter rod with an annular hole according to claim 3, characterized in that: When the central cavity (3) is spherical, the radius of the sphere is no greater than the radius of the filter rod.

5. The special-shaped filter rod with an annular hole according to claim 3, characterized in that: When the central cavity (3) is spindle-shaped, when it is arranged along the length direction of the central axis of the filter rod, the base circle diameter does not exceed the diameter of the filter rod.

6. The special-shaped filter rod with an annular hole according to claim 3, characterized in that: When the central cavity (3) is spindle-shaped, when it is arranged in a direction perpendicular to the central axis of the filter rod, its base circle diameter and overall length do not exceed the diameter of the filter rod.

7. The special-shaped filter rod with an annular hole according to any one of claims 1 to 6, characterized in that: The filter rod has a diameter of 4.5 to 8.5 mm.

8. A filter tip connected to the special-shaped filter plug with an annular hole according to claim 7, characterized in that: The length of the filter tip is 15-60 mm.

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