Method for improving filtering effect of filter material paper on harmful substances in smoke

Abstract

The invention discloses a method for improving the filtering effect of filter material paper on harmful substances in smoke. The method comprises the following steps: embossing filter material paper; the thickness of the filter material paper before embossing treatment is 25-140 [mu] m, and the quantification is 12-50 g / m < 2 >; the thickness of the filter material paper after the embossing treatment is 2.5-7.6 times of that of the filter material paper before the embossing treatment. When the filter material paper treated by the method disclosed by the invention is applied to the cigarette filter stick, the filter material paper can be gathered, formed and filled more fully and uniformly, and the running path of mainstream smoke in the cigarette filter stick becomes more complicated, so that the filtering of the cigarette filter stick on the smoke is changed into the combined action of surface adsorption precipitation and penetrating adsorption precipitation from the original surface adsorption precipitation; the filtering effect of the cigarette smoke on harmful substances is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cigarette filter rod material processing, and more specifically, to a method for improving the filtering effect of filter paper on harmful substances in smoke. Background Art

[0002] Cigarette filter rods (also called "filter rods", "mouth rods", "cigarette butts") are one of the important components of cigarettes and play an irreplaceable and important role in reducing the harm and tar of cigarettes. At present, the most widely used filter rod filter material is acetate fiber. After consumers consume cigarettes, the filter rods are discarded in the natural environment as the residue of consumption. Acetate fiber has many characteristics, one of which is that it is not easy to degrade, not easy to disperse in water, not soluble in water, and has a long-term impact on the environment. Seeking high-performance biodegradable materials as filter rod filter materials will be an inevitable trend in 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 the characteristics of wide sources, rich reserves, renewable and recyclable, and have received widespread and high attention. Paper filter materials will also become one of the important materials for filter tip filter materials. However, the application of paper filter materials in filter tips has problems such as poor filtering effect of filter paper on harmful substances such as tar, nicotine and carbon monoxide in the smoke released when cigarettes are burned.

[0003] As one of the important raw materials for paper filter rods, the research and application of paper filter material has been carried out. Patent CN102720001A discloses a paper filter material and a processing method for effectively reducing the amount of phenol in cigarette smoke. By adding powdered acetified pulp to the paper filter material, tar and phenolic substances in cigarette smoke can be effectively reduced. Patent CN102987560A discloses a paper filter material with an active adsorption layer. At least one surface of the paper filter material is coated with smoke adsorption powder, which can selectively adsorb volatile and semi-volatile harmful substances in the smoke. Without changing the filter rod process, smoke selective filtration is achieved and the irritation of cigarettes is reduced. Patent CN101433818A discloses an adsorption material mainly used for selective adsorption of particulate tar in tobacco. Patent CN110959908A discloses an adsorption material for selective adsorption of carbon monoxide in cigarette filter rods.

[0004] However, in the current related research in this field, 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 complicated and the cost is relatively high. In addition, by adding functional substances, it is also necessary to consider the impact of its disposal on the environment and the impact of its residues in cigarette smoke on human health during smoking. Summary of the invention

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

[0006] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

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

[0008] The present invention performs physical embossing treatment on filter paper of specific thickness and quantity, and controls the thickness of the filter paper after embossing to reach a specific level, so that the filter paper can be gathered, formed, filled and uniformly filled when it is made into a cigarette filter rod, and the running path of mainstream smoke in the cigarette filter rod becomes more complicated, so that the filtering of smoke by the cigarette filter rod changes from the original surface adsorption and precipitation to the combined effect of surface adsorption and precipitation and penetration adsorption and precipitation, thereby improving the filtering effect of cigarette smoke on harmful substances.

[0009] In addition, the filter paper treated by the method of the present invention is used to prepare cigarette filter rods, which can also reduce the amount of filter paper used and improve the hardness and pressure drop stability of the cigarette filter rods.

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

[0011] The thickness of the filter paper after embossing treatment is adjusted to be a multiple of the thickness of the filter paper before embossing treatment within this range, and the obtained filter paper has a better filtering effect on tar, nicotine and carbon monoxide.

[0012] Furthermore, the filter paper before embossing has a thickness of 25 to 53 μm and a basis weight of 13 to 20 g / m 2 .

[0013] By regulating the thickness and basis weight of the filter paper before embossing treatment within this range, the obtained filter paper has a better filtering effect on tar and carbon monoxide.

[0014] Furthermore, the embossing depth of the embossing treatment is 76 to 500 μm.

[0015] Furthermore, the filter paper is made from the following raw materials in parts by weight: 70 to 95 parts of plant fiber, 0.2 to 10 parts of reinforcing agent, 0 to 5 parts of surface property regulator, and 0 to 15 parts of dye.

[0016] The filter paper used is a paper filter material made of plant fibers. Compared with the existing mainstream acetate fiber cigarette filter rods, the cigarette filter rods prepared using the paper filter material have superior material safety and biodegradability, are environmentally friendly, and have broad practical value.

[0017] Furthermore, 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] Furthermore, the reinforcing agent is one or more of starch reinforcing agent, cellulose reinforcing agent, plant gum reinforcing agent, polyvinyl alcohol, sodium alginate, chitosan or polyamide epichlorohydrin.

[0019] Furthermore, the starch enhancer is one or more of dialdehyde starch, cationic starch, oxidized starch, esterified starch, cross-linked starch, etherified starch or acid-treated starch.

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

[0021] Furthermore, the plant gum enhancer is one or more of locust bean gum, tragacanth gum, gelatin, agar, guar gum, cationic guar gum or hydroxypropyl guar gum.

[0022] Furthermore, the surface property regulator is one or more of alkyl ketene dimer, alkenyl succinic anhydride, rosin, glycerol, propylene glycol, acrylic oil-proofing agent, chitosan oil-proofing agent or starch-based oil-proofing agent.

[0023] The present invention has no particular limitation on dyes, and any known dye that meets safety requirements can be used in the present invention, 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, plant carbon black or brilliant black BN.

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

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

[0026] Furthermore, the filter paper before embossing is non-wrinkled plant fiber paper and / or wrinkled plant fiber paper manufactured by a papermaking wrinkling process.

[0027] Furthermore, the filter paper before embossing is manufactured by a wet papermaking process using a fourdrinier forming, an oblique wire forming or a rotary wire forming process.

[0028] Furthermore, the present invention also provides a wet papermaking process for filter paper before embossing treatment: (1) mixing plant fiber and water in a specific mass ratio to obtain slurry; (2) mixing the slurry obtained in step (1) with a reinforcing agent to obtain base paper after forming on a screen, pressing and dehydrating, and drying on a paper machine; (3) applying sizing to the base paper obtained in step (2) using a surface property regulator and a dye, and drying to obtain filter paper.

[0029] Furthermore, the area of ​​the embossed region accounts for 5 to 40% of the area of ​​the filter paper before the embossing.

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

[0031] In some embodiments of the present invention, the basic unit of the embossed pattern is a shape surrounded by curves, such as a circle and / or an ellipse.

[0032] In some embodiments of the present invention, the basic unit of the embossed pattern is a shape surrounded by line segments, such as one or more of a triangle, a quadrilateral, and a polygon.

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

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

[0035] Furthermore, the shape of the filter paper pattern protruding from the paper surface is a three-dimensional shape, specifically, it can be one or more of a cylinder, a cone or a polyhedron.

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

[0037] Furthermore, the physical embossing offline processing method consists of three parts: an unwinding section, an embossing section, and a winding section. Specifically, a longitudinal paper cutting section can be added between the embossing section and the winding section to control the width of the paper web in the winding section or a combination of multiple widths.

[0038] The present invention has no particular limitation on the product form of the filter paper, and the filter paper can be cut into a desired form according to different requirements.

[0039] In some embodiments of the present invention, the product form of the filter paper is a coiled shape in which strips or belts of paper are wound layer by layer.

[0040] In some embodiments of the present invention, the product form of the filter paper is strips or belts of paper continuously stacked layer by layer in a packaging box.

[0041] In some embodiments of the present invention, the filter paper can be cut into a desired shape according to different requirements, such as a quadrilateral sheet.

[0042] Another object of the present invention is to provide a cigarette filter paper, which is obtained by treating the filter paper with the above method.

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

[0044] Another object of the present invention is to provide the use of the above-mentioned cigarette filter paper in the preparation of cigarette filter rods.

[0045] Another object of the present invention is to provide a cigarette filter rod, which comprises the above-mentioned cigarette filter paper.

[0046] Another object of the present invention is to provide a cigarette comprising the above-mentioned cigarette filter rod.

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

[0048] The present invention performs physical embossing treatment on the surface of the filter paper, so that the filter paper can be gathered, formed, filled and uniformly when it is made into a cigarette filter rod, and the running path of the mainstream smoke in the cigarette filter rod becomes more complicated, so that the filtering of the smoke by the cigarette filter rod changes from the original surface adsorption and precipitation to the combined effect of surface adsorption and precipitation and penetration adsorption and precipitation, thereby improving the filtering effect of cigarette smoke on harmful substances.

[0049] In addition, the filter paper treated by the method of the present invention is used to prepare cigarette filter rods, which can also reduce the amount of filter paper used and improve the hardness and pressure drop stability of the cigarette filter rods.

[0050] The present invention physically embosses the surface of filter paper and utilizes mechanical energy to change the original physical structure of the filter paper, without significantly increasing the paper processing cost. However, the processing is flexible and there is a wide range of process technology options. The existing paper production lines can be fully utilized, ensuring the economy and subsequent scalability of high-filtration performance filter paper. DETAILED DESCRIPTION

[0051] The content of the present invention is further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art. Unless otherwise specified, the reagents, methods and equipment used in the present embodiment are conventional reagents, methods and equipment in the art.

[0052] Example 1

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

[0054] The thickness of the filter paper before embossing is 52.25 μm and the basis weight is 19.18 g / m 2 The thickness of the filter paper after embossing is 326.75 μm, and the basis weight is 19.45 g / m 2 ; 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. Preparation process of PF20A: 1) Mix wood pulp fiber and water evenly to obtain slurry; 2) Mix the slurry obtained in step 1) with guar gum evenly, and then put it on the net to form, squeeze and dehydrate it, and dry it on a paper machine to obtain base paper; 3) Use alkyl ketene dimer to perform surface sizing treatment on the base paper obtained in step 2), and dry it to obtain filter paper PF20A; wherein, wood pulp fiber 95 parts, guar gum 0.5 parts, alkyl ketene dimer 4.5 parts.

[0055] Example 2

[0056] This embodiment provides a method for improving the filtering effect of filter paper on harmful substances in smoke. The difference between this embodiment and embodiment 1 is that the thickness of the filter paper before embossing is 25 μm and the basis weight is 13.0 g / m 2 In addition, through the embossing process, the thickness of the filter paper after embossing is 156.25μm and the basis weight is 13.2g / 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 in Example 1.

[0057] Example 3

[0058] This embodiment provides a method for improving the filtering effect of filter paper on harmful substances in smoke. The difference between this embodiment and embodiment 1 is that the thickness of the filter paper before embossing is 140 μm and the basis weight is 40.0 g / m 2 In addition, through the embossing process, the thickness of the filter paper after embossing is 875μm and the basis weight is 40.1g / 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 in Example 1.

[0059] Example 4

[0060] This embodiment provides a method for improving the filtering effect of filter paper on harmful substances in smoke. The difference between this embodiment and embodiment 1 is that the thickness of the filter paper after embossing is 392.0 μm and the basis weight is 19.21 g / m 2 ; The ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment is 7.50.

[0061] Example 5

[0062] This embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas. The difference between this embodiment and embodiment 1 is that the thickness of the filter paper after embossing is 200.0 μm and the basis weight is 19.39 g / m 2 ; The ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment is 3.83.

[0063] Example 6

[0064] This embodiment provides a method for improving the filtering effect of filter paper on harmful substances in flue gas, comprising the following steps: embossing the filter paper (PF36D) to obtain the embossed filter paper.

[0065] The thickness of the filter paper before embossing is 86.22 μm and the basis weight is 31.65 g / m 2 The thickness of the filter paper after embossing is 239 μm and the basis weight is 32.10 g / m 2 ; The ratio of the thickness of the filter paper after embossing treatment to the thickness of the filter paper before embossing treatment is 2.77. The formula and preparation process of PF36D: 1) Mix wood pulp fiber and water evenly to obtain slurry; 2) Mix the slurry obtained in step 1) with cationic starch evenly, and then put it on the net to form, squeeze and dehydrate it, and dry it on a paper machine to obtain base paper; 3) Use alkyl ketene dimer to perform surface sizing treatment on the base paper obtained in step 2), and dry it to obtain filter paper PF36D; wherein, 95 parts of wood pulp fiber, 0.5 parts of cationic starch, and 4.5 parts of alkyl ketene dimer.

[0066] Example 7

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

[0068] The thickness of the filter paper before embossing is 110 μm and the basis weight is 37.86 g / m 2 The thickness of the filter paper after embossing is 300 μm and the basis weight is 38.21 g / m 2 ; 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: 1) Mix wood pulp fiber and water evenly to obtain slurry; 2) Mix the slurry obtained in step 1) with guar gum evenly, and then put it on the net to form, squeeze and dehydrate it, and dry it on a paper machine to obtain base paper; 3) Use polyvinyl alcohol to perform surface sizing treatment on the base paper obtained in step 2), and dry it to obtain filter paper PS36F; wherein, wood pulp fiber 95 parts, guar gum 0.5 parts, polyvinyl alcohol 4.5 parts.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is that the thickness of the filter paper before embossing is 20.0 μm and the basis weight is 19.18 g / m 2 Through the embossing process, the thickness of the filter paper after embossing is 125μm and the basis weight is 19.25g / m 2 ; 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 in Example 1.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the thickness of the filter paper before embossing is 150.0 μm and the basis weight is 19.18 g / m 2 Through the embossing process, the thickness of the filter paper after embossing is 937.5μm and the basis weight is 19.27g / m 2 ; 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 in Example 1.

[0073] Comparative Example 3

[0074] 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 10.0 g / m 2 Through the embossing process, the thickness of the filter paper after embossing is 326.75μm and the basis weight is 10.05g / m 2That 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 in 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 Through the embossing process, the thickness of the filter paper after embossing is 326.75μm and the basis weight is 60.25g / 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 in Example 1.

[0077] Comparative Example 5

[0078] The difference between this comparative example and Example 1 is that 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 treatment to the thickness of the filter paper before embossing treatment is 1.52.

[0079] Comparative Example 6

[0080] The difference between this comparative example and Example 1 is that 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 treatment to the thickness of the filter paper before embossing treatment is 8.

[0081] Performance Testing

[0082] Cigarette samples were prepared from filter paper rods before and after embossing in the industry comparison examples of each embodiment, and conventional smoke indexes of the cigarette samples were compared and analyzed, wherein the conventional smoke indexes were tested according to the standard methods of GB / T19609-2004, GB / T23355-2009, GB / T23203.1-2008, and GB / T23356-2009. The results are shown in Tables 1 and 2.

[0083] Table 1

[0084]

[0085]

[0086] It can be seen from the examples in Table 1 that after the filter paper of the present invention is embossed, the cigarette filter rod prepared by the filter paper obtained is applied to the cigarette sample. Compared with the cigarette sample obtained by the filter paper without embossing treatment, the tar release in the conventional smoke index is reduced by at least 8.8%, the nicotine release is reduced by at least 6.5%, and the CO release is reduced by at least 2.2%, and the filtering effect of harmful substances in cigarette smoke is significant. It can be seen from Comparative Examples 1 and 3 that when the thickness or basis weight of the filter paper before embossing is too small, the embossing easily penetrates the filter paper, making the filtering effect of cigarette smoke after embossing worse than that of Example 1; it can be seen from Comparative Example 2 that when the thickness of the filter paper before embossing is too large, the filling uniformity of the filter paper in the filter rod is poor, resulting in the filtering effect of cigarette smoke after embossing worse than that of Example 1; it can be seen from Comparative Example 4 that when the basis weight of the filter paper before embossing is too large, the harmful particulate matter in the smoke after embossing is on the contact surface of the filter paper fiber. The area is difficult to increase significantly, and the penetration, adsorption and precipitation effects of the cigarette filter rod on the filtration of smoke are poor, resulting in the filtration effect of the cigarette smoke after embossing treatment being worse than that of Example 1; it can be seen from Comparative Example 5 that when the thickness of the filter paper after embossing treatment is too small compared with that before embossing treatment, the filtration of the cigarette filter rod on the smoke is mainly surface adsorption and precipitation, which is not conducive to the improvement of the filter paper on the filtration effect of the smoke; it can be seen from Comparative Example 6 that 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 of tar, nicotine and CO in the smoke is higher than that in Example 1.

[0087] Table 2

[0088]

[0089]

[0090] It can be seen from Table 2 that after embossing the filter paper of the present invention, the width of the filter paper required for preparing cigarette filter rods is reduced, the amount of material used is reduced, the pressure drop stability of the filter rod is improved, and the hardness of the filter rod is increased.

[0091] The above embodiments are preferred experimental methods of the present invention, but the implementation methods of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for improving the filtering effect of filter paper on harmful substances in flue gas, characterized in that: The method comprises the following steps: embossing the filter paper; the filter paper before embossing has a thickness of 25 to 140 μm and a basis weight of 12 to 50 g / m 2 ; The thickness of the filter paper after embossing treatment is 2.5 to 7.6 times the thickness of the filter paper before embossing treatment.

2. The method according to claim 1, characterized in that: The thickness of the filter paper after the embossing treatment is 6 to 7.6 times the thickness of the filter paper before the embossing treatment.

3. The method according to claim 1, characterized in that: The filter paper before embossing has a thickness of 25 to 53 μm and a basis weight of 13 to 20 g / m 2 .

4. The method according to claim 1, characterized in that: The filter paper is prepared from the following raw materials in parts by weight: 70 to 95 parts of plant fiber, 0.2 to 10 parts of reinforcing agent, 0 to 5 parts of surface property regulator, and 0 to 15 parts of dye.

5. The method according to claim 1, characterized in that: The air permeability of the filter paper before embossing is 1000 to 40000 cm 3 / (min·cm 2 ).

6. The method according to claim 1, characterized in that: The embossed area accounts for 5 to 40% of the total area.

7. The method according to claim 1, characterized in that: The harmful substance in the flue gas is at least one of tar, nicotine or carbon monoxide.

8. A filter paper for cigarettes, characterized in that: The filter paper is obtained by treating the filter paper by the method according to any one of claims 1 to 7.

9. Use of the cigarette filter paper according to claim 8 in preparing cigarette filter rods.

10. A cigarette filter rod, characterized in that: Including the cigarette filter paper as claimed in claim 8.

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