A method for improving the filtering effect of filter paper on harmful substances in flue gas

Abstract

The application discloses a method for improving the filtering effect of filter paper on harmful substances in flue gas. The method comprises the following steps: embossing treatment is performed on the filter paper; the thickness of the filter paper before the embossing treatment is 25-140 microns, and the basis weight is 12-50 g / m 2 ; the thickness of the filter paper after the embossing treatment is 2.5-7.6 times that of the filter paper before the embossing treatment. When the filter paper treated by the method is applied to a cigarette filter rod, the filter rod can be gathered and formed to be more full and uniform, the running path of the mainstream flue gas in the cigarette filter rod becomes more complex, the filtering of the cigarette filter rod on the flue gas changes from the original surface adsorption and deposition to the combined action of surface adsorption and deposition and penetration adsorption and deposition, and the filtering effect of the cigarette flue gas on harmful substances is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cigarette filter rod material processing, and more particularly to a method for improving the filtering effect of filter paper on harmful substances in smoke. BACKGROUND

[0002] The filter rod (also known as "filter stick", "mouth stick", "cigarette butt") of a cigarette plays an irreplaceable important role in reducing harm and reducing tar in cigarettes. The most widely used filter rod filtering material is acetate fiber. After consumers consume cigarettes, the filter rod, as the remaining material of consumption, is discarded in the natural environment. Acetate fiber has many characteristics, one of which is not easy to degrade, not easy to disperse in water, not water-soluble, and long-term environmental impact. Seeking high-performance biodegradable materials as filter rod filtering materials will be the inevitable trend of the development of cigarette filter rod materials. Paper filter rods are usually made of natural plant fibers such as wood pulp. Natural plant fibers have been widely and highly concerned due to their wide sources, abundant reserves, renewability, and recyclability, and paper filter materials will also become one of the important materials for filter rod filtering materials. However, there are problems such as poor filtering effect of filter paper on harmful substances such as tar, nicotine, and carbon monoxide in smoke released during cigarette combustion when paper filter materials are applied to filters.

[0003] Paper filter materials, as one of the important raw materials for paper filter rods, have been researched and applied. Patent CN102720001A discloses a paper filter material that effectively reduces the amount of phenol in cigarette smoke and a processing method thereof. By adding powdered acetylated pulp to the paper filter material, the amount of tar and phenolic substances in cigarette smoke can be effectively reduced. Patent CN102987560A discloses a paper filter material with an active adsorption layer. A smoke adsorption powder is applied to at least one surface of the paper filter material, which can selectively adsorb volatile and semi-volatile harmful substances in smoke, achieve selective filtration of smoke without changing the filter rod process, and reduce the irritability of cigarettes. Patent CN101433818A discloses an adsorbent material mainly used for selectively adsorbing particulate tar in tobacco. Patent CN110959908A discloses an adsorbent material used in cigarette filter rods for selectively adsorbing carbon monoxide.

[0004] However, in the current field of related research, it is often necessary to change the raw materials of paper filter materials or add functional substances to achieve the filtration of tar, nicotine, or carbon monoxide in smoke. The process is relatively complex, and the cost is relatively high. In addition, the addition of functional substances also needs to consider their impact on the environment after disposal and their impact on human health when they are left in cigarette smoke during smoking. SUMMARY

[0005] In order to solve the above-mentioned defects of the prior art, the primary purpose of the present application is to provide a method for improving the filtering effect of filter paper on harmful substances in flue gas, which can effectively improve the filtering performance of filter paper on tar, nicotine and CO.

[0006] The above-mentioned purpose of the present application is realized by the following technical solutions.

[0007] The method for improving the filtering effect of filter paper on harmful substances in flue gas comprises the following steps: embossing treatment is performed on filter paper; the thickness of the filter paper before the embossing treatment is 25-140 µm, and the basis weight is 12-50 g / m 2 ; the thickness of the filter paper after the embossing treatment is 2.5-7.6 times the thickness of the filter paper before the embossing treatment.

[0008] The present application performs physical embossing treatment on filter paper with specific thickness and basis weight, and controls the thickness of the filter paper after the embossing treatment to reach a specific level, which can make the filter paper gather and form when being made into a cigarette filter rod, and the running path of mainstream flue gas in the cigarette filter rod becomes more complex, so that the filtration of the cigarette flue gas on harmful substances changes from surface adsorption and deposition to the combined action of surface adsorption and deposition and penetration adsorption and deposition, thereby improving the filtering effect of the cigarette flue gas on harmful substances.

[0009] In addition, the filter paper treated by the method of the present application for preparing a cigarette filter rod can also reduce the amount of filter paper used and improve the hardness and pressure drop stability of the cigarette filter rod.

[0010] Further, the thickness of the filter paper after the embossing treatment is 6-7.6 times the thickness of the filter paper before the embossing treatment.

[0011] Controlling the thickness of the filter paper after the embossing treatment to be a multiple of the thickness of the filter paper before the embossing treatment within this range can obtain filter paper with better filtering effect on tar, nicotine and carbon monoxide.

[0012] Further, the thickness of the filter paper before the embossing treatment is 25-53 µm, and the basis weight is 13-20 g / m 2 .

[0013] Controlling the thickness and basis weight of the filter paper before the embossing treatment within this range can obtain filter paper with better filtering effect on tar and carbon monoxide.

[0014] Further, the embossing depth of the embossing treatment is 76-500 µm.

[0015] Further, the filter paper is prepared from component raw materials comprising the following weight fractions: plant fibers 70-95 parts, reinforcing agents 0.2-10 parts, surface property adjusting agents 0-5 parts, and dyes 0-15 parts.

[0016] The filter paper used is a plant fiber paper filter material, and the filter rod prepared using the same has superior material safety and biodegradability, is environmentally friendly, and has wide practical value compared with the existing mainstream cellulose acetate cigarette filter rod.

[0017] Further, the plant fiber is one or more of bamboo pulp fiber, wood pulp fiber, hemp pulp fiber, tobacco fiber, cotton fiber, reed pulp fiber, bagasse fiber, lyocell fiber or viscose fiber.

[0018] Further, the reinforcing agent is one or more of starch-based reinforcing agent, cellulose-based reinforcing agent, plant gum-based reinforcing agent, polyvinyl alcohol, sodium alginate, chitosan or polyamide epichlorohydrin.

[0019] Further, the starch-based reinforcing agent is one or more of dialdehyde starch, cationic starch, oxidized starch, esterified starch, crosslinked starch, etherified starch or acid-treated starch.

[0020] Further, the cellulose-based reinforcing agent is one or more of sodium carboxymethyl cellulose, sodium ethyl cellulose, cellulose acetate or nitrocellulose.

[0021] Further, the plant gum-based reinforcing agent is one or more of locust bean gum, tragacanth gum, gelatin, agar, guar gum, cationic guar gum or hydroxypropyl guar gum.

[0022] Further, the surface property adjusting agent is one or more of alkyl alkene ketone dimer, alkenyl succinic anhydride, rosin, glycerol, propylene glycol, acrylic oil-proof agent, chitosan-based oil-proof agent or starch-based oil-proof agent.

[0023] The dye is not particularly limited, and any known dye meeting safety requirements can be used in the present application, including but not limited to one or more of tobacco extract, food blue, food red, food orange, food black, food yellow, food brown, iron oxide, iron hydroxide, vegetable carbon black or brilliant black BN.

[0024] Further, the air permeability of the filter paper before the embossing treatment is 1000-40000 cm 3 / (min·cm 2 ).

[0025] Further, the longitudinal tensile strength of the filter paper before the embossing treatment is 900-9000 cN / 30 mm, the transverse tensile strength is 450-4000 cN / 30 mm, the longitudinal elongation is 2.0-15.0%, and the paper water absorption value is 0.2-106.0 mm / 10 min.

[0026] Further, the filter paper before the embossing treatment is a non-creped plant fiber paper and / or a creped plant fiber paper manufactured by a papermaking creping process.

[0027] Further, the filter paper before the embossing treatment is manufactured by a long net forming, an inclined net forming or a cylinder net forming wet papermaking process.

[0028] Further, the present application also provides a wet papermaking process for the filter paper before the embossing treatment: (1) uniformly mixing plant fibers and water in a specific mass ratio to obtain a slurry; (2) uniformly mixing the slurry obtained in step (1) with a reinforcing agent, and then performing an on-machine forming, a press dewatering and a drying on a paper machine to obtain a raw paper; (3) performing a surface sizing treatment on the raw paper obtained in step (2) by using a surface property adjusting agent and a dye, and drying, to obtain the filter paper.

[0029] Further, the area ratio of the embossed region to the area of the filter paper before the embossing treatment is 5-40%.

[0030] The basic unit form of the pattern formed by the embossing treatment is not particularly limited, and the unit form of the embossing pattern can be a dot, a block, a ring, a line or other pattern.

[0031] In some embodiments of the present application, the basic unit of the embossing pattern is a shape enclosed by a curved line, such as a circle and / or an ellipse.

[0032] In some embodiments of the present application, the basic unit of the embossing pattern is a shape enclosed by a line segment, such as one or more of a triangle, a quadrilateral and a polygon.

[0033] Further, the distance between the center positions of two adjacent basic units of the pattern formed by the embossing treatment is 0.5-4 mm.

[0034] Further, the pattern formed by the embossing treatment is concave and / or convex relative to the surface of the filter paper before the embossing treatment.

[0035] Further, the shape of the pattern of the filter paper protruding out of the surface is a three-dimensional shape, specifically, one or more of a cylinder, a cone and a polyhedron.

[0036] Further, the embossing treatment of the present application is a physical embossing off-line processing method.

[0037] Further, the physical embossing off-line processing method comprises a unwinding section, an embossing section and a winding section, and specifically, a longitudinal cutting section can be added between the embossing section and the winding section to control the width of the paper web or a combination of multiple widths.

[0038] The product form of the filter paper is not particularly limited in the present application, and can be cut into a desired form according to different requirements.

[0039] In some embodiments of the present application, the product form of the filter paper is a reel-shaped disc in which strip-shaped or belt-shaped paper layers are wound layer by layer.

[0040] In some embodiments of the present application, the product form of the filter paper is a reel-shaped disc in which strip-shaped or belt-shaped paper layers are wound layer by layer.

[0041] In some embodiments of the present application, the product form of the filter paper is a reel-shaped disc in which strip-shaped or belt-shaped paper layers are wound layer by layer.

[0042] Another object of the present application is to provide a filter paper for cigarettes obtained by treating the filter paper by the above method.

[0043] Further, the filter paper for cigarettes has a basis weight of 12-50 g / m 2 , a gas permeability of 1200-40000 cm 3 / (min·cm 2 ), a longitudinal tensile strength of 600-8000 cN / 30 mm, a transverse tensile strength of 300-3500 cN / 30 mm, a longitudinal elongation of 2.0-15.0%, and a water absorption value of 0.1-106.0 mm / 10 min.

[0044] Another object of the present application is to provide the use of the filter paper for cigarettes in preparing a filter rod for cigarettes.

[0045] Another object of the present application is to provide a filter rod for cigarettes comprising the filter paper for cigarettes.

[0046] Another object of the present application is to provide a filter rod for cigarettes comprising the filter paper for cigarettes.

[0047] Compared with the prior art, the present application has the following beneficial effects:

[0048] The present application can make the filter paper gather and form uniformly when the filter paper is made into a filter rod for cigarettes, and the running path of mainstream smoke in the filter rod for cigarettes becomes more complex, so that the filtration of the filter rod for cigarettes on the smoke changes from surface adsorption and deposition to the combined action of surface adsorption and deposition and penetration adsorption and deposition, thereby improving the filtration effect of harmful substances in cigarette smoke.

[0049] In addition, the filter paper treated by the method of the present application for preparing a filter rod for cigarettes can also reduce the amount of filter paper used and improve the hardness and pressure drop stability of the filter rod for cigarettes.

[0050] The application changes the original physical structure of the filter paper by physical embossing on the surface of the filter paper, without obvious increase in paper processing cost, but with flexible processing, large process technology selection space, full use of existing paper production line, and ensured economy and later scale of the filter paper with high filtration performance. DETAILED DESCRIPTION

[0051] The application will be further described in conjunction with specific embodiments, but the embodiments do not limit the application in any form. Unless otherwise specified, the technical means used in the embodiments are conventional means familiar to those skilled in the art. Unless otherwise specified, the reagents, methods and equipment used in the embodiments are conventional reagents, methods and equipment in the technical field.

[0052] Embodiment 1

[0053] The embodiment provides a method for improving the filtration effect of filter paper on harmful substances in flue gas, comprising the following steps: performing embossing treatment on filter paper (PF20A) to obtain filter paper after embossing treatment.

[0054] The thickness of the filter paper before embossing treatment is 52.25 μm, the basis weight is 19.18 g / m 2 , the thickness of the filter paper after embossing treatment is 326.75 μm, the basis weight is 19.45 g / m 2 , and the ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment is 6.25. The preparation process of PF20A is as follows: 1) uniformly mixing wood pulp fibers and water to obtain pulp; 2) uniformly mixing the pulp obtained in step 1) with guar gum, and then performing web forming, dewatering and drying on a paper machine to obtain raw paper; 3) performing surface sizing treatment on the raw paper obtained in step 2) by using alkyl ketene dimer, and drying, to obtain the filter paper PF20A; wherein the wood pulp fibers are 95 parts, the guar gum is 0.5 parts, and the alkyl ketene dimer is 4.5 parts.

[0055] Embodiment 2

[0056] The embodiment provides a method for improving the filtration effect of filter paper on harmful substances in flue gas, which is different from embodiment 1 in that the thickness of the filter paper before embossing treatment is 25 μm, the basis weight is 13.0 g / m 2 ; in addition, through embossing process adjustment, the thickness of the filter paper after embossing treatment is 156.25 μm, the basis weight is 13.2 g / m 2 , that is, the ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment (6.25) is consistent with that of embodiment 1.

[0057] Embodiment 3

[0058] The embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, which is different from the embodiment 1 in that the thickness of the filter paper before the embossing treatment is 140 mu m, and the basis weight is 40.0 g / m 2 ; in addition, by adjusting the embossing process, the thickness of the filter paper after the embossing treatment is 875 mu m, and the basis weight is 40.1 g / m 2 , that is, the ratio of the thickness of the filter paper after the embossing treatment to the thickness of the filter paper before the embossing treatment (6.25) is consistent with the embodiment 1.

[0059] Embodiment 4

[0060] The embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, which is different from the embodiment 1 in that: by adjusting the embossing process, the thickness of the filter paper after the embossing treatment is 392.0 mu m, and the basis weight is 19.21 g / m 2 ; the ratio of the thickness of the filter paper after the embossing treatment to the thickness of the filter paper before the embossing treatment is 7.50.

[0061] Embodiment 5

[0062] The embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, which is different from the embodiment 1 in that: by adjusting the embossing process, the thickness of the filter paper after the embossing treatment is 200.0 mu m, and the basis weight is 19.39 g / m 2 ; the ratio of the thickness of the filter paper after the embossing treatment to the thickness of the filter paper before the embossing treatment is 3.83.

[0063] Embodiment 6

[0064] The embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, which comprises the following steps: performing embossing treatment on filter paper (PF36D) to obtain filter paper after the embossing treatment.

[0065] The thickness of the filter paper before the embossing treatment is 86.22 mu m, and the basis weight is 31.65 g / m 2 ; the thickness of the filter paper after the embossing treatment is 239 mu m, and the basis weight is 32.10 g / m 2 ; the ratio of the thickness of the filter paper after the embossing treatment to the thickness of the filter paper before the embossing treatment is 2.77. The formula and preparation process of the PF36D are as follows: 1) uniformly mixing wood pulp fibers and water to obtain pulp; 2) uniformly mixing the pulp obtained in the step 1) and cationic starch, and then performing the following processes on a paper machine: wire forming, press dewatering and drying, to obtain raw paper; 3) performing surface sizing treatment on the raw paper obtained in the step 2) by using alkyl ketene dimer, and drying, to obtain the filter paper PF36D; wherein the wood pulp fibers are 95 parts, the cationic starch is 0.5 part, and the alkyl ketene dimer is 4.5 parts.

[0066] Example 7

[0067] The embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, comprising the following steps: embossing treatment is performed on filter paper (PS36F) to obtain filter paper after embossing treatment.

[0068] The thickness of the filter paper before embossing treatment is 110 μm, the basis weight is 37.86 g / m 2 , the thickness of the filter paper after embossing treatment is 300 μm, the basis weight is 38.21 g / m 2 , and the ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment is 2.73. The formula and preparation process of PS36F are as follows: 1) uniformly mixing wood pulp fibers and water to obtain pulp; 2) uniformly mixing the pulp obtained in step 1) with guar gum, and then performing web forming, dewatering and drying on a paper machine to obtain raw paper; 3) performing surface sizing treatment on the raw paper obtained in step 2) by using polyvinyl alcohol, and drying to obtain the filter paper PS36F; wherein the wood pulp fibers are 95 parts, the guar gum is 0.5 parts, and the polyvinyl alcohol is 4.5 parts.

[0069] Comparative Example 1

[0070] The difference between the comparative example and example 1 is that the thickness of the filter paper before embossing treatment is 20.0 μm, the basis weight is 19.18 g / m 2 , the thickness of the filter paper after embossing treatment is 125 μm, the basis weight is 19.25 g / m 2 , and the ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment (6.25) is consistent with that of example 1.

[0071] Comparative Example 2

[0072] The difference between the comparative example and example 1 is that the thickness of the filter paper before embossing treatment is 150.0 μm, the basis weight is 19.18 g / m 2 , the thickness of the filter paper after embossing treatment is 937.5 μm, the basis weight is 19.27 g / m 2 , and the ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment (6.25) is consistent with that of example 1.

[0073] Comparative Example 3

[0074] The difference between the comparative example and example 1 is that the thickness of the filter paper before embossing treatment is 52.25 μm, the basis weight is 10.0 g / m 2 , the thickness of the filter paper after embossing treatment is 326.75 μm, the basis weight is 10.05 g / m 2; i.e. the ratio of the thickness of the filter paper after embossing to the thickness of the filter paper before embossing (6.25) is consistent with Example 1.

[0075] Comparative Example 4

[0076] The difference between this comparative example and Example 1 is that the thickness of the filter paper before embossing is 52.25 μm and the basis weight is 60.0 g / m 2 ; by embossing process adjustment, the thickness of the filter paper after embossing is 326.75 μm and the basis weight is 60.25 g / m 2 ; i.e. the ratio of the thickness of the filter paper after embossing to the thickness of the filter paper before embossing (6.25) is consistent with Example 1.

[0077] Comparative Example 5

[0078] The difference between this comparative example and Example 1 is that by embossing process adjustment, the thickness of the filter paper after embossing is 79.5 μm and the basis weight is 19.38 g / m 2 ; the ratio of the thickness of the filter paper after embossing to the thickness of the filter paper before embossing is 1.52.

[0079] Comparative Example 6

[0080] The difference between this comparative example and Example 1 is that by embossing process adjustment, the thickness of the filter paper after embossing is 418.0 μm and the basis weight is 19.40 g / m 2 ; the ratio of the thickness of the filter paper after embossing to the thickness of the filter paper before embossing is 8.

[0081] Performance Test

[0082] The filter paper rods of each example and comparative example before and after embossing were used to make cigarette samples, and the conventional smoke indicators of the cigarette samples were compared and analyzed, wherein the detection of the conventional smoke indicators was performed according to the standard methods of GB / T 19609-2004, GB / T 23355-2009, GB / T 23203.1-2008, and GB / T 23356-2009. The results are shown in Tables 1 and 2.

[0083] Table 1

[0084]

[0085]

[0086] As can be seen from the examples in Table 1, after embossing the filter paper of the present application, the filter rod prepared from the filter paper is applied to the cigarette sample, compared with the filter paper without embossing treatment, the release amount of tar in the smoke conventional index is at least reduced by 8.8%, the release amount of nicotine is at least reduced by 6.5%, the release amount of CO is at least reduced by 2.2%, and the filtration effect of harmful substances in cigarette smoke is significantly improved. As can be seen from Comparative Example 1 and Comparative Example 3, when the thickness or basis weight of the filter paper before embossing treatment is too small, it is easy to cause the embossing treatment to penetrate the filter paper, so that the filtration effect of cigarette smoke after embossing treatment is worse than that of Example 1; as can be seen from Comparative Example 2, when the thickness of the filter paper before embossing treatment is too large, the filling uniformity of the filter paper in the filter rod is poor, so that the filtration effect of cigarette smoke after embossing treatment is worse than that of Example 1; as can be seen from Comparative Example 4, when the basis weight of the filter paper before embossing treatment is too large, the contact area between the harmful particulate matter in the smoke and the filter paper fibers after embossing treatment is difficult to significantly increase, and the penetration, adsorption and precipitation effect of the filter rod on the smoke is poor, so that the filtration effect of cigarette smoke after embossing treatment is worse than that of Example 1; as can be seen from Comparative Example 5, when the thickness of the filter paper after embossing treatment is too small compared with that before embossing treatment, the filtration of the filter rod on the smoke is mainly surface adsorption and precipitation, which is not conducive to the improvement of the filtration effect of the filter paper on the smoke; as can be seen from Comparative Example 6, when the thickness of the filter paper after embossing treatment is too large compared with that before embossing treatment, because the filling uniformity of the filter paper in the filter rod is reduced, the release amount of tar, nicotine and CO in the smoke is higher than that of Example 1.

[0087] Table 2

[0088]

[0089]

[0090] As can be seen from Table 2, after embossing the filter paper of the present application, the width of the filter paper web required for preparing the filter rod of the cigarette is reduced, the amount of material is reduced, the pressure drop stability of the filter rod is improved, and the hardness of the filter rod is improved.

[0091] The above examples are the preferred experimental methods of the present application, but the implementation of the present application is not limited by the above examples, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present application should be equivalent replacement methods, which are all included in the protection scope of the present application.

Claims

1. A method for improving the filtration effect of filter paper on harmful substances in smoke gas, characterized by, The method comprises the following steps: embossing the filter paper; the thickness of the filter paper before embossing is 25-140 μm, and the basis weight is 12-50 g / m 2 ; the thickness of the filter paper after embossing is 2.5-7.6 times of the thickness of the filter paper before embossing. The filter paper is prepared from component raw materials including the following components by weight: 70-95 parts of plant fiber, 0.2-10 parts of reinforcing agent, 0-5 parts of surface property modifier, and 0-15 parts of dye; The plant fiber is one or more of bamboo pulp fiber, wood pulp fiber, hemp pulp fiber, tobacco fiber, cotton fiber, reed pulp fiber, bagasse fiber, lyocell fiber, or viscose fiber. The reinforcing agent is one or more of starch-based reinforcing agent, cellulose-based reinforcing agent, plant gum-based reinforcing agent, polyvinyl alcohol, sodium alginate, chitosan, or polyamide epichlorohydrin; the starch-based reinforcing agent is one or more of dialdehyde starch, cationic starch, oxidized starch, esterified starch, crosslinked starch, etherified starch, or acid-treated starch; the cellulose-based reinforcing agent is one or more of sodium carboxymethyl cellulose, sodium ethyl cellulose, cellulose acetate, or nitrocellulose; the plant gum-based reinforcing agent is one or more of locust bean gum, tragacanth gum, gelatin, agar, guar gum, cationic guar gum, or hydroxypropyl guar gum. The surface property modifier is one or more of alkyl alkenone dimer, alkenyl succinic anhydride, rosin, glycerol, propylene glycol, acrylic oil-proof agent, chitosan-based oil-proof agent, or starch-based oil-proof agent. The air permeability of the filter paper before the embossing treatment is 1000-40000 cm 3 (min•cm 2 ) The harmful substances in the flue gas are at least one of tar, nicotine, or carbon monoxide. The wet papermaking process of the filter paper before the embossing treatment comprises the following steps: (1) uniformly mixing plant fiber and water at a specific mass ratio to obtain slurry; (2) uniformly mixing the slurry obtained in step (1) with the reinforcing agent, and then performing web forming, dewatering, and drying on a paper machine to obtain raw paper; (3) performing surface sizing treatment on the raw paper obtained in step (2) using the surface property modifier and the dye, and drying to obtain the filter paper.

2. The method of claim 1, wherein, The thickness of the filter paper after the embossing treatment is 6-7.6 times the thickness of the filter paper before the embossing treatment.

3. The method of claim 1, wherein, The thickness of the filter paper before the embossing treatment is 25 to 53 μm, and the basis weight is 13 to 20 g / m 2 .

4. The method of claim 1, wherein, The area ratio of the embossed region is 5-40%.

5. A cigarette filter paper, characterized by, The filter paper is obtained by the method of any one of claims 1-4.

6. Use of the filter paper for cigarettes of claim 5 in the preparation of a cigarette filter rod.

7. A cigarette filter rod, characterized by, The filter paper for cigarettes of claim 5.

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