Composite filter rod and use thereof

Abstract

The application discloses a composite filter rod and application thereof. The composite filter rod comprises an inner core and a peripheral wrapping layer from inside to outside. The inner core is curled from a continuous sheet. The sheet is cut on one side and has a V-shaped cutting groove penetrating along an axial direction near the wrapping layer. The V-shaped cutting groove is formed by cutting and curling the sheet of the inner core. On one hand, the V-shaped cutting groove can divide the smoke. On the other hand, the cracks on the cutting surface of the sheet can greatly increase the smoke contact surface, improve the interception and adsorption of the smoke, and reduce the harmful chemical components in the smoke.

Description

Technical Field

[0001] This invention belongs to the technical field of the tobacco industry, specifically relating to a composite filter rod and its application. Background Technology

[0002] The filter rods commonly used in cigarettes are made of cellulose acetate. Although cellulose acetate can effectively absorb and intercept tar in cigarette smoke, it is not easily degraded, causing environmental pollution.

[0003] CN111772232A discloses a biodegradable hollow composite polylactic acid (PLA) fiber tow cigarette filter rod that reduces smoke temperature. The filter rod consists of at least two sections: a composite filter section and a PLA filter section. The PLA filter section is located near the inhalation end and is integrally formed from PLA fiber tow, with a hollow cavity extending along its length. The end of the filter rod facing the cigarette is called the upper end, and the end near the inhalation end is called the lower end. The upper end of the cigarette filter rod consists of uniformly distributed cylindrical PLA filter rods, while the lower end is a hollow PLA filter rod. This invention utilizes the Venturi effect generated by the reduction in size to lower the smoke temperature. Simultaneously, the PLA raw material is completely biodegradable, improving the environmental friendliness of the cigarette filter rod and preventing environmental pollution.

[0004] CN111789285A discloses a method for preparing polylactic acid (PLA) temperature-modified tow filter rods. The method involves uniformly mixing PLA masterbatch, SEBS, and PP, followed by online melt polymerization at 140-200℃. The mixture is then extruded via screw extrusion, cooled, and melt-spun into PLA filaments. These filaments are then drawn, crimped, dried, and shaped to obtain PLA filaments, which are then used to form filter rods on a conventional filter rod machine. The PLA temperature-modified tow filter rods prepared by this invention have a higher melting point and significantly improved heat resistance than traditional PLA filament filter rods. This avoids the shrinkage phenomenon in heated tobacco products and significantly reduces smoke temperature, solving the problems of high smoke temperature, strong heat irritation, and poor smoking comfort in heated tobacco products. This method is suitable for industrial production.

[0005] Polylactic acid (PLA) is increasingly used in cigarette products as a filter rod material. However, it mainly serves to reduce the temperature of cigarette smoke. PLA has a limited adsorption capacity and is difficult to effectively capture harmful components in cigarette smoke. Therefore, how to improve the filtration effect of PLA filter rods to meet the requirements of reducing tar and harm in cigarette smoke has become an urgent problem to be solved. Summary of the Invention

[0006] To address the shortcomings of existing technologies and practical needs, this invention provides a composite filter rod and its applications. The composite filter rod, through its unique structure, can reduce harmful chemical components in flue gas without affecting the user's sensory experience.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a composite filter rod, the composite filter rod comprising an inner core and an outer wrapping layer from the inside out;

[0009] The inner core is formed by rolling a continuous sheet.

[0010] After being cut on one side, the sheet has a V-shaped cutting groove that runs through the axial direction near the wrapping layer.

[0011] In the composite filter rod of the present invention, the inner core sheet is cut and rolled to form a V-shaped cutting groove. On the one hand, the V-shaped cutting groove can divide the flue gas, and on the other hand, the pores on the cut surface of the sheet can greatly increase the contact surface of the flue gas, improve the interception and adsorption of the flue gas, and reduce the harmful chemical components in the flue gas.

[0012] Preferably, the sheet material includes polylactic acid.

[0013] Preferably, the polylactic acid includes expanded polylactic acid.

[0014] In this invention, the polylactic acid used is expanded polylactic acid, which contains a large number of continuous closed pores. By cutting, the pores are broken, thereby significantly increasing its surface area and thus improving the adsorption effect on harmful components in flue gas.

[0015] Preferably, the thickness of the sheet is 0.2-3mm, for example, it can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm or 2.8mm, etc.

[0016] Preferably, the cutting spacing is 1-3mm, for example, it can be 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm or 2.9mm, etc.

[0017] Preferably, the depth of the sheet cutting is 0.1-2mm, for example, it can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.1mm, 1.3mm, 1.5mm, 1.7mm or 1.9mm.

[0018] Preferably, the uncut thickness of the sheet is ≥0.1mm, for example, it can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

[0019] Preferably, the wrapping layer includes a filament layer and a fixing layer, wherein the fixing layer is located around the filament layer.

[0020] Preferably, the material of the filament layer includes cellulose acetate and / or polypropylene fibers.

[0021] Preferably, the material of the fixing layer includes any one or a combination of at least two of paper, polylactic acid film, or polyhydroxyalkanoate film.

[0022] Preferably, the surface of the V-shaped cutting groove is also coated with an adsorption coating.

[0023] Preferably, the thickness of the adsorption coating is 0.1-0.3 mm, for example, it can be 0.12 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.27 mm or 0.29 mm.

[0024] Preferably, the adsorption coating comprises any one or a combination of at least two of activated carbon powder, tobacco extract, or polyvinylpyrrolidone.

[0025] Preferably, the tobacco extract can be Peruvian extract.

[0026] Preferably, the adsorption coating is a combination of activated carbon powder, Peruvian extract, and polyvinylpyrrolidone.

[0027] In this invention, polyvinylpyrrolidone in the adsorption coating can be used as a binder to better load activated carbon powder and tobacco extract onto the surface of the V-shaped cutting groove. The combination of activated carbon powder and Peruvian extract can not only better adsorb harmful components in the smoke, but also make the smoke smoother and improve the taste.

[0028] Preferably, the mass ratio of activated carbon powder, Peruvian extract and polyvinylpyrrolidone is (1-3):(0.1-0.8):(0.2-1).

[0029] The values ​​“1-3” can be 1.1, 1.3, 1.5, 1.7, 2, 2.2, 2.5, 2.7, or 2.9, etc.

[0030] "0.1-0.8" can be 0.2, 0.3, 0.4, 0.5, 0.6, or 0.7, etc.;

[0031] "0.2-1" can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.

[0032] Preferably, the sheet is also covered with cotton thread.

[0033] Preferably, the cotton thread is loaded with fragrance-enhancing ingredients.

[0034] Preferably, the flavoring ingredients include any one or a combination of at least two of the following: tangerine peel flavoring, coffee flavoring, grapefruit flavoring, or peppermint flavoring.

[0035] Preferably, the flavoring components include tangerine peel flavoring and peppermint flavoring.

[0036] Preferably, the outer diameter of the composite filter rod is about 5mm-8mm, for example, the outer diameter can be 5.5mm, 6mm, 6.5mm, 7mm, or 7.5mm, etc.

[0037] Furthermore, the composite filter rod can have a length between approximately 5 mm and 40 mm. The length can be 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm, 32 mm, 35 mm, or 38 mm, etc.

[0038] All the specific point values ​​within the above range can be selected, and will not be elaborated on here.

[0039] Secondly, the present invention provides an application of the composite filter rod according to the first aspect in cigarettes.

[0040] Preferably, the composite filter rod is used in combination with other filter rods.

[0041] Preferably, the other filter rods include cellulose acetate filter rods and / or hollow filter rods.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) In the composite filter rod of the present invention, the inner core sheet is cut and rolled to form a V-shaped cutting groove. On the one hand, the V-shaped cutting groove can divide the flue gas, and on the other hand, the cracks on the sheet cutting surface can greatly increase the contact surface of the flue gas, enhance the interception and adsorption of the flue gas, and reduce the harmful chemical components in the flue gas.

[0044] (2) When the composite filter rod of the present invention is applied to cigarettes, it can not only reduce the harmful components in cigarette smoke, but also improve the smoking experience of consumers. Attached Figure Description

[0045] The above description of the present invention and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solutions.

[0046] Figure 1 This is a cross-sectional schematic diagram of the composite filter rod of the present invention;

[0047] Figure 2 This is a schematic diagram of the polylactic acid foam described in this invention after cutting;

[0048] Figure 3 This is a cross-sectional schematic diagram of the composite filter rod of the present invention;

[0049] The reference numerals in the attached drawings are explained as follows: 11. Polylactic acid foam sheet; 12. V-shaped cutting groove; 13. Fiber bundle layer; 14. Fixing layer; 15. Adsorption coating; 16. Cotton thread. Detailed Implementation

[0050] To further illustrate the technical means and effects of this invention, the following description, in conjunction with embodiments and accompanying drawings, provides a further explanation of the invention. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0051] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not limited to those elements and may also include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0052] "Optional" or "any one" means that the matter or event described thereafter may or may not occur, and the description includes both the possibility that the event will occur and the possibility that the event will not occur.

[0053] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the quantity (i.e., number of occurrences) of the element or component. Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0054] The terms "one embodiment," "some embodiments," "exemplary," "specific example," or "some examples," etc., used in this invention refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this document, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example.

[0055] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0056] Example 1

[0057] This embodiment provides a composite filter rod with an outer diameter of 5.4 mm, which includes an inner core and an outer wrapping layer from the inside out.

[0058] The inner core is formed by cutting a 1.5mm thick and 14mm wide polylactic acid foam sheet on one side (cutting depth of 1.2mm and cutting spacing of 1mm) and then rolling it with cotton thread as the axis.

[0059] The expanded polylactic acid sheet has a V-shaped cut groove running along the axial direction near the wrapping layer after being rolled up.

[0060] The surface of the V-shaped cutting groove is coated with activated carbon powder, Peruvian extract and polyvinylpyrrolidone in a mass ratio of 1:0.5:0.5, and the coating thickness is 0.2 mm.

[0061] The cotton thread contains a mixture of tangerine peel flavoring and peppermint flavoring;

[0062] The outer wrapping layer consists of a filament layer and a fixing layer, with the fixing layer located around the filament layer.

[0063] The material of the filament layer is cellulose acetate; the material of the fixing layer is paper.

[0064] The composite filter rod is prepared as follows: foamed polylactic acid is laid flat on a workbench, and longitudinal continuous cutting is performed on the polylactic acid with a blade. The cutting interval is 1 mm and the cutting depth is 1.2 mm. The uncut surface of the foamed polylactic acid is laid flat on an annular table. The cutting cracks of the foamed polylactic acid are opened by the action of the annular table to form a V-shaped cutting groove. Using cotton thread as an axis, the uncut side of the polylactic acid sheet is rolled around the cotton thread. The rolled polylactic acid sheet enters the positioning circular guide tube, and after passing through the circular guide tube, it enters the forming smoke gun. Inside the forming smoke gun, the cut surface of the polylactic acid sheet is evenly wrapped by a fiber bundle layer. The fiber bundle layer is then wrapped by filter rod forming paper to form the filter rod.

[0065] Example 2

[0066] This embodiment provides a composite filter rod with an outer diameter of 6.3 mm, which includes an inner core and an outer wrapping layer from the inside out.

[0067] The inner core is formed by cutting a 0.5mm thick and 40mm wide polylactic acid foam sheet on one side (cutting depth of 0.3mm and cutting spacing of 3mm) and then rolling it with cotton thread as the axis.

[0068] The expanded polylactic acid sheet has a V-shaped cut groove running along the axial direction near the wrapping layer after being rolled up.

[0069] The surface of the V-shaped cutting groove is coated with activated carbon powder, Peruvian extract and polyvinylpyrrolidone in a mass ratio of 2:0.8:0.3, and the coating thickness is 0.1 mm.

[0070] The cotton thread contains a mixture of tangerine peel flavoring and peppermint flavoring;

[0071] The outer wrapping layer consists of a filament layer and a fixing layer, with the fixing layer located around the filament layer.

[0072] The filament layer is made of polypropylene fiber; the fixing layer is made of polylactic acid membrane.

[0073] The preparation method of the composite filter rod is as described in Example 1.

[0074] Example 3

[0075] This embodiment provides a composite filter rod with an outer diameter of 7.8 mm, which includes an inner core and an outer wrapping layer from the inside out.

[0076] The inner core is formed by cutting a 3mm thick and 10mm wide polylactic acid foam sheet on one side (cutting depth of 2mm and cutting spacing of 1mm) and then rolling it with cotton thread as the axis.

[0077] The expanded polylactic acid sheet has a V-shaped cut groove running along the axial direction near the wrapping layer after being rolled up.

[0078] The surface of the V-shaped cutting groove is coated with activated carbon powder, Peruvian extract and polyvinylpyrrolidone in a mass ratio of 3:0.2:1, and the coating thickness is 0.1 mm.

[0079] The cotton thread contains a mixture of tangerine peel flavoring and peppermint flavoring;

[0080] The outer wrapping layer consists of a filament layer and a fixing layer, with the fixing layer located around the filament layer.

[0081] The filament layer is made of cellulose acetate; the fixing layer is made of polyhydroxyalkanoate membrane.

[0082] The preparation method of the composite filter rod is as described in Example 1.

[0083] Example 4

[0084] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the inner core does not contain cotton thread loaded with fragrance-enhancing ingredients. The rest of the composition, structure, and dimensions are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0085] Example 5

[0086] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the surface of the V-shaped cut groove of the sheet is not coated with an adsorption coating. The rest of the composition, structure and size are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0087] Example 6

[0088] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the adsorption coating is composed of activated carbon powder and polyvinylpyrrolidone, and the thickness of the adsorption coating remains unchanged. The remaining composition, structure, and dimensions are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0089] Example 7

[0090] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the adsorption coating is Peruvian extract, and the thickness of the adsorption coating remains unchanged. The remaining composition, structure, and dimensions are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0091] Example 8

[0092] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the cutting spacing on the surface of the sheet is 4 mm. The rest of the composition, structure, and dimensions are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0093] Example 9

[0094] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the cutting spacing on the surface of the sheet is 0.5 mm. The rest of the composition, structure, and dimensions are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0095] Example 10

[0096] This embodiment provides a composite filter rod. The only difference between the composite filter rod and that in Embodiment 1 is that the material of the sheet is polycaprolactone. The rest of the composition, structure, and size are the same as in Embodiment 1, and the preparation method is the same as in Embodiment 1.

[0097] Comparative Example 1

[0098] This comparative example provides a composite filter rod with an outer diameter of 5.4 mm, which includes an inner core and an outer wrapping layer from the inside out.

[0099] The inner core is formed by rolling a 1.5mm thick and 14mm wide polylactic acid foam sheet with cotton thread as the axis.

[0100] The cotton thread contains a mixture of tangerine peel flavoring and peppermint flavoring;

[0101] The outer wrapping layer consists of a filament layer and a fixing layer, with the fixing layer located around the filament layer.

[0102] The material of the filament layer is cellulose acetate; the material of the fixing layer is paper.

[0103] The composite filter rod is prepared as follows: foamed polylactic acid is laid flat on the workbench, and the polylactic acid sheet is rolled around the cotton thread as an axis. The rolled polylactic acid sheet enters the positioning circular guide tube, passes through the circular guide tube and enters the forming smoke gun. Inside the forming smoke gun, the polylactic acid sheet is evenly wrapped by the fiber bundle layer, and the fiber bundle layer is then wrapped by the filter rod forming paper to form the filter rod.

[0104] Test Example 1: Mainstream Flue Gas Detection

[0105] Test cigarettes were prepared by combining the composite filter rods obtained in Examples 1-10 and Comparative Example 1 with cellulose acetate filter rods and tobacco shreds. The composite filter rods were 20 mm long, and the cellulose acetate filter rods were 10 mm long. The composite filter rod section in the test cigarettes was located near the tobacco shred end. Cigarettes with cellulose acetate filter rods (30 mm long) were prepared using the same process as control cigarettes. Cigarettes with cellulose acetate filter rods with an outer diameter of 5.4 mm were control cigarette 1, cigarettes with cellulose acetate filter rods with an outer diameter of 6.3 mm were control cigarette 2, and cigarettes with cellulose acetate filter rods with an outer diameter of 7.8 mm were control cigarette 3.

[0106] The tar and carbon monoxide content in the mainstream smoke captured from the test cigarettes and control cigarettes were measured, and the draw resistance of the cigarettes was also tested.

[0107] Test method:

[0108] The tar content was determined according to GB / T 19609-2004, "Total particulate matter and tar for conventional analysis of cigarettes using a smoking machine".

[0109] The CO content was determined according to GB / T 23356-2009, Determination of Carbon Monoxide in Gas Phase of Cigarette Smoke - Non-scattering Infrared Method.

[0110] The draw resistance test was performed in accordance with GB / T 22838.5-2009 Determination of Physical Properties of Cigarettes and Filters Part 5: Cigarette Draw Resistance and Filter Pressure Drop.

[0111] The results are shown in Table 1 below.

[0112] Table 1

[0113] sample <![CDATA[Tar (mg·cig -1 )]]> <![CDATA[CO(mg·cig -1 )]]> Pull-in resistance (Pa) Example 1 4.5 4.4 1100 Example 2 7.2 7.1 1090 Example 3 9.2 9.4 810 Example 4 4.7 4.7 1050 Example 5 5.1 5.1 1050 Example 6 4.7 4.6 1110 Example 7 5.2 5.1 1080 Example 8 5.8 5.9 1400 Example 9 / / / Example 10 8.7 8.6 1050 Comparative Example 1 / / 2300 Comparison with cigarette 1 6.3 6.1 1300 Comparison with cigarette 2 8.1 8.2 1150 Comparison of cigarettes 3 11.7 11.9 950

[0114] As shown in Table 1, compared with the control cigarette, the composite filter rods prepared in Examples 1-3 of this invention have lower draw resistance and better adsorption effect on harmful chemical components in cigarette smoke.

[0115] As can be seen from Examples 5-7, coating the surface of the V-shaped cutting groove with an adsorption coating and the selection of the type of adsorption coating will affect the adsorption effect of the filter rod on harmful chemical components in flue gas.

[0116] As can be seen from Examples 8-9, when the cutting spacing of the sheet surface in Example 8 is too large, the draw resistance of the cigarette is high, and the effective contact area between polylactic acid and the adsorption coating and the smoke is small, resulting in poor adsorption effect on harmful components of the smoke; while in Example 9, the cutting spacing of the sheet surface is 0.5mm, which is too small, making it difficult to achieve continuous production of the composite filter rod, and cigarette rolling was not carried out.

[0117] As can be seen from Example 10, the choice of material for the sheet has a great influence on the adsorption effect of the filter rod;

[0118] As shown in Comparative Example 1, when the sheet is not cut, the draw resistance of the cigarette is too high and cannot meet the application standards.

[0119] Test Example 2 Sensory Quality

[0120] Sample preparation was the same as in Test Example 1. Sensory quality tests were conducted on the test cigarettes and the control cigarettes.

[0121] Test method: Refer to national standard GB 5606.4-2005 Cigarettes Part 4: Sensory technical requirements.

[0122] Testing criteria: Aroma scores range from 1 to 30 points, harmony scores range from 1 to 10 points, off-flavor scores range from 1 to 15 points, irritation scores range from 1 to 20 points, aftertaste scores range from 1 to 25 points, and the total score is 100 points.

[0123] Table 2 shows the sensory evaluation results of the sample cigarettes with a filter rod outer diameter of 5.4 mm.

[0124] Table 2

[0125]

[0126] As shown in Test Example 1, the cutting spacing on the sheet surface of Example 9 was 0.5 mm, making continuous production of the composite filter rod difficult, and cigarette rolling was not carried out. In Comparative Example 1, when the sheet was not cut, the draw resistance of the cigarette was too high and could not meet the application standards. Therefore, the sensory evaluation results of Example 9 and Comparative Example 1 are not listed in Table 2.

[0127] As can be seen from Table 2, compared with the control cigarette, the composite filter rod obtained by the method of the present invention in Example 1 of the present invention, when used in cigarettes, significantly improves the aroma, off-flavors, harmony, irritation, and taste.

[0128] Comparative evaluations were conducted on cigarettes with filter rods of different outer diameters, such as Example 2 and control cigarette 2, and Example 3 and control cigarette 3. The results showed that when the composite filter rods obtained by the method of the present invention in Examples 2-3 were used in cigarettes, the cigarettes showed significant improvements in aroma, off-flavors, harmony, irritation, and taste.

[0129] The applicant declares that this invention illustrates a composite filter rod and its application through the above embodiments, but this invention is not limited to the detailed methods described above, that is, it does not mean that this invention must rely on the detailed methods described above to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this invention.

Claims

1. A composite filter rod, characterized in that, The composite filter rod comprises an inner core and an outer wrapping layer from the inside out; The inner core is formed by rolling a continuous sheet. The sheet material is cut on one side and has a V-shaped cutting groove that runs through the axial direction near the wrapping layer. The cutting spacing is 1-3mm; The uncut sheet has a thickness ≥ 0.1 mm; The surface of the V-shaped cutting groove is also coated with an adsorption coating. The adsorption coating is a combination of activated carbon powder, Peruvian extract and polyvinylpyrrolidone; The mass ratio of activated carbon powder, Peruvian extract, and polyvinylpyrrolidone is (1-3):(0.1-0.8):(0.2-1). The sheet material includes polylactic acid; The polylactic acid includes expanded polylactic acid.

2. The composite filter rod according to claim 1, characterized in that, The thickness of the sheet is 0.2-3 mm.

3. The composite filter rod according to claim 1, characterized in that, The depth of the sheet cutting is 0.1-2mm.

4. The composite filter rod according to claim 1, characterized in that, The wrapping layer includes a filament layer and a fixing layer, with the fixing layer located around the filament layer.

5. The composite filter rod according to claim 4, characterized in that, The material of the filament layer includes cellulose acetate and / or polypropylene fibers.

6. The composite filter rod according to claim 4, characterized in that, The material of the fixing layer includes any one or a combination of at least two of paper, polylactic acid film, or polyhydroxyalkanoate film.

7. The composite filter rod according to claim 1, characterized in that, The thickness of the adsorption coating is 0.1-0.3 mm.

8. The composite filter rod according to claim 1, characterized in that, The sheet is also wrapped with cotton thread.

9. The composite filter rod according to claim 8, characterized in that, The cotton thread is loaded with fragrance-enhancing ingredients.

10. The composite filter rod according to claim 1, characterized in that, The outer diameter of the composite filter rod is 5mm-8mm.

11. The application of a composite filter rod according to any one of claims 1-10 in cigarettes.

12. The application according to claim 11, characterized in that, The composite filter rod is used in combination with other filter rods.

13. The application according to claim 12, characterized in that, The other filter rods include cellulose acetate filter rods and / or hollow filter rods.

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