A tobacco filter rod base paper, its method of manufacture and use

Abstract

The application discloses a tobacco filter rod base paper and a preparation method and application thereof. The preparation method comprises the following steps: mixing dry materials and a reinforcing liquid, and preparing the filter rod base paper through roller compaction molding. Raw material components of the reinforcing liquid comprise propylene glycol, first glue powder and first wood pulp fibers. The dry materials comprise tobacco powder, second wood pulp fibers and second glue powder. The tobacco filter rod base paper prepared by the technical scheme has a compact structure, excellent tensile strength and elongation at break. The use of tobacco powder in the base paper also has the effect of flavoring cigarettes, can reduce the "paper taste", and the process is simple, low in cost and convenient for production and application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tobacco filter rods, in particular to a tobacco filter rod base paper and a preparation method and use thereof. BACKGROUND

[0002] Common filter rods in cigarettes mainly include paper filter rods, acetate filter rods, flavored filter rods, blasting bead filter rods, and composite filter rods, etc. In practical applications, different types of filter rods are often used in combination to exert the advantages of each type of filter rod. Paper filter rods have high filtration efficiency and low price, and have obvious effects on reducing harm and reducing tar in cigarettes, but paper filter rods will intercept and adsorb part of the smoke aroma, and at the same time produce a "paper taste", which will result in poor sensory experience of users.

[0003] In order to reduce the negative impact of paper filter rods on smoke, many tobacco and filter rod companies have researched adding tobacco fibers to paper filter rod base paper. In patent CN110122924A "Tobacco Sheet Filter Rod Composite Filter Rod and Manufacturing Method Thereof", tobacco fibers and acetate fibers are mixed and then formed by papermaking method to bring full tobacco aroma, improve the tear resistance of tobacco sheet, and improve the filtration capacity of smoke. In patent 109898369B "Preparation Method of Cigarette Paper Filter Rod Paper Material with Natural Tobacco Aroma", tobacco stems are used as raw materials to prepare base paper for tobacco filter rods. The tobacco stems are subjected to wet method pith removal to remove half fibers, and then subjected to slicing, pulping, pulp latent treatment, and classification by up-flow pressure screen to obtain tobacco stem papermaking pulp. In addition, in patents such as "Preparation Method of Cigarette Paper Filter Material Containing Tobacco Extract", "Dry Process Reconstituted Tobacco Filter Rod", and "Double-layer Composite Reconstituted Tobacco Paper Filter Rod and Preparation Method Thereof", tobacco components are added to filter rod base paper.

[0004] The present application provides a method for preparing a tobacco filter rod base paper by roller pressing, which is different from the above technical methods. SUMMARY

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a tobacco filter rod base paper and a preparation method and use thereof.

[0006] To achieve the above-mentioned purposes and other related purposes, the present application is obtained by the following technical solutions.

[0007] The present application provides a preparation method of a tobacco filter rod base paper, which comprises the following steps:

[0008] The dry material and the reinforcing liquid are mixed to prepare the filter rod base paper by roller pressing; the raw material components of the reinforcing liquid include propylene glycol, first glue powder, and first wood pulp fibers; the dry material includes tobacco powder, second wood pulp fibers, and second glue powder.

[0009] Preferably, the enhancing liquid further comprises water.

[0010] Preferably, after obtaining the filter rod base paper, drying is further needed.

[0011] According to the preparation method described above, the first glue powder comprises one or more of sodium carboxymethyl starch, microcrystalline cellulose, sodium hydroxypropyl cellulose, and sodium carboxymethyl cellulose.

[0012] According to the preparation method described above, the first wood pulp fiber comprises one or more of coniferous wood pulp fiber and broad-leaved wood pulp fiber.

[0013] According to the analysis method described above, the mass ratio of the dry material and the enhancing liquid is 1-2:1. It can be 1-1.3:1, 1.3-1.5:1, 1.5-1.8:1, 1.8-2:1, and in a specific implementation, it is 1.3:1, 1.5:1.

[0014] If the content of the enhancing liquid in the material after mixing the dry material and the enhancing liquid is too high, the prepared base paper will be soft and not hard enough, and thus cannot meet the production requirements of the filter rod. If the content of the enhancing liquid in the material after mixing the dry material and the enhancing liquid is too low, the base paper will become brittle and easy to break, affecting the subsequent production and application.

[0015] According to the preparation method described above, the length of the first wood pulp fiber is 0.7-4 mm, and the width is 10-40 μm. The size of the wood pulp fiber will affect the strength and flatness of the base paper. If the size is small, the prepared base paper will be weak and cannot meet the production and application requirements. If the size is large, the distribution of the wood pulp fiber will be uneven, and thus the stability of the product will be affected.

[0016] Preferably, the particle size of the tobacco powder is 200-650 mesh. It can be 200-300 mesh, 300-400 mesh, 400-500 mesh, 600-600 mesh, and 600-650 mesh, and in a specific implementation, it is 300 mesh, 450 mesh, and 600 mesh. The particle size of the tobacco powder is related to the stability and strength of the product. If the particle size of the tobacco powder is too small, the energy consumption in the production process will be large, and thus the production cost will be increased. If the particle size is too large, the strength of the base paper will be decreased, and the stability will be poor.

[0017] Preferably, the preparation temperature of the enhancing liquid is 40-90℃. It can be 40-50℃, 50-60℃, 60-70℃, 70-80℃, 80-90℃, and in a specific implementation, it is 50℃, 60℃, and 80℃. In this way, the first glue powder is easy to dissolve, and the enhancing liquid is uniformly dispersed.

[0018] According to the preparation method described above, the second wood pulp fiber includes one or more of softwood pulp fiber and hardwood pulp fiber.

[0019] According to the preparation method described above, the length of the second wood pulp fiber is 0.7-4 mm and the width is 10-40 μm. The size of the wood pulp fiber affects the strength and smoothness of the base paper. If the size is too small, the resulting base paper will have poor strength and will not meet the requirements of production applications. If the size is too large, the distribution of the wood pulp fiber will be uneven, which will affect the stability of the product.

[0020] According to the preparation method described above, the second adhesive powder includes one or more of sodium carboxymethyl starch, microcrystalline cellulose, sodium hydroxypropyl cellulose, and sodium carboxymethyl cellulose.

[0021] Preferably, the drying temperature described above is 80-105℃, and the time is 2-10 minutes. The drying temperature can be 80-85℃, 85-90℃, 90-100℃, or 100-105℃, and in a specific embodiment, it is 90℃ or 95℃.

[0022] Preferably, the degree of substitution of the sodium carboxymethyl starch is 0.4-1, and the viscosity (25°C) of the 2% aqueous solution is 800-1200 MPa.s. For example, the viscosity (25°C) of the 2% aqueous solution can be 800-850 MPa.s, 850-900 MPa.s, 900-950 MPa.s, 950-1000 MPa.s, 1000-1050 MPa.s, 1050-1100 MPa.s, or 1100-1200 MPa.s, and in a specific embodiment, it is 800 MPa.s.

[0023] Preferably, the sodium carboxymethyl cellulose has a degree of substitution of 8-12, and the viscosity (25°C) of a 2% aqueous solution is 800-1200 MPa.s. For example, the viscosity (25°C) of the 2% aqueous solution can be 800-850 MPa.s, 850-900 MPa.s, 900-950 MPa.s, 950-1000 MPa.s, 1000-1050 MPa.s, 1050-1100 MPa.s, 1100-1200 MPa.s, and in a specific embodiment, it is 1200 MPa.s.

[0024] Preferably, the microcrystalline cellulose has a particle size of 30-60 μm and a bulk density of 0.22-0.35 g / cm³. 3 For example, the bulk density can be 0.22-0.27 g / cm³. 3 0.27-0.32 g / cm³ 3 0.32-0.35 g / cm³ 3 .

[0025] Preferably, the degree of substitution of the sodium hydroxypropyl cellulose is 2-5, and the viscosity (25°C) of the 2% aqueous solution is 800-1200 MPa.s. For example, the viscosity (25°C) of the 2% aqueous solution can be 800-850 MPa.s, 850-900 MPa.s, 900-950 MPa.s, 950-1000 MPa.s, 1000-1050 MPa.s, 1050-1100 MPa.s, 1100-1200 MPa.s, and in a specific embodiment, it is 1000 MPa.s.

[0026] The selection of the above-mentioned substances is not arbitrary and must meet the specified parameters. For example, when the degree of substitution of sodium carboxymethyl starch is 0.4-1, and the viscosity (25°C) of a 2% aqueous solution is less than 800 MPa·s, the viscosity of the adhesive solution will be too low, resulting in poor strength properties of the base paper and failure to meet processing requirements. When the degree of substitution of sodium carboxymethyl starch is 0.4-1, and the viscosity (25°C) of a 2% aqueous solution is greater than 1200 MPa·s, the viscosity of the adhesive solution will be high, resulting in poor flowability and making it difficult to smoothly deliver the adhesive solution during production, thus preventing the completion of the dry-wet mixing operation.

[0027] For example, when the degree of substitution of sodium carboxymethyl cellulose is 8-12, the viscosity (25°C) of a 2% aqueous solution is less than 800 MPa.s, resulting in insufficient adhesive viscosity, leading to poor strength and easy breakage of the base paper, failing to meet processing requirements. When the degree of substitution of sodium carboxymethyl cellulose is 8-12, the viscosity (25°C) of a 2% aqueous solution is greater than 1200 MPa.s, resulting in excessively high adhesive viscosity, making it impossible to complete the dry and wet mixing operation.

[0028] For example, when the degree of substitution of the sodium hydroxypropyl cellulose is 2-5, and the viscosity (25°C) of a 2% aqueous solution is less than 800 MPa.s, insufficient adhesive viscosity will occur, resulting in poor strength of the base paper and failure to meet processing requirements. When the degree of substitution of the sodium hydroxypropyl cellulose is 2-5, and the viscosity (25°C) of a 2% aqueous solution is greater than 1200 MPa.s, excessively high adhesive viscosity and consistency will occur, making it impossible to prepare the materials or complete the dry-wet mixing operation.

[0029] According to the preparation method described above, the content of propylene glycol in the reinforcing solution is 15-45 wt%, based on the total mass of the reinforcing solution; for example, it can be 15-20 wt%, 20-25 wt%, 25-30 wt%, 30-35 wt%, 35-40 wt%, 40-45 wt%, and in a specific embodiment, it is 20 wt%, 30 wt%, 40 wt%.

[0030] The content of the first adhesive powder is 0.5-5 wt%; for example, it can be 0.5-1.2 wt%, 1.2-2 wt%, 2-2.5 wt%, 2.5-3 wt%, 3-4 wt%, 4-5 wt%, or in a specific embodiment, 1 wt%, 1.5 wt%, or 2 wt%.

[0031] The content of wood pulp fiber is 0.3-4 wt%; for example, it can be 0.3-0.8 wt%, 0.8-1.2 wt%, 1.2-2 wt%, 2-2.8 wt%, 2.8-3.3 wt%, 3.3-4 wt%, or in a specific embodiment, 0.5 wt%, 1 wt%, or 2 wt%.

[0032] The water content is 50-84 wt%; for example, it can be 50-60 wt%, 60-65 wt%, 65-70 wt%, 70-78 wt%, 78-84 wt%, and in a specific implementation, it is 56 wt%, 67.5 wt%, or 78.5 wt%.

[0033] Propylene glycol enhances the flexibility of the base paper and increases its elongation at break. The role of the first adhesive powder and the first wood pulp fiber is to ensure a certain tensile strength of the base paper.

[0034] According to the analytical method described above, the mass ratio of the second wood pulp fiber to tobacco powder in the dry material is 1:6-15. For example, it can be 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, or 1:15. In a specific implementation, it is 1:6, 1:9, or 1:13.

[0035] According to the analytical method described above, the mass ratio of the second adhesive powder to tobacco powder in the dry material is 1:10-23. For example, it can be 1:10-12, 1:12-14, 1:14-16, 1:16-18, 1:18-20, 1:20-23, and in a specific implementation, it is 1:10, 1:17, or 1:23.

[0036] Preferably, the mixing time for the dry material and reinforcing liquid is 5-15 minutes. After the dry material and reinforcing liquid are fully mixed so that the tobacco powder is evenly adhered to the surface of the wood pulp fiber, the mixture is then rolled into shape.

[0037] According to the analysis method described above, the pressure during roll forming is 5–150 kN / m. For example, it can be 5–20 kN / m, 20–40 kN / m, 40–60 kN / m, 60–80 kN / m, 80–105 kN / m, 105–120 kN / m, 120–130 kN / m, 130–140 kN / m, or 140–150 kN / m.

[0038] According to the analysis method described above, the gap between the two rollers during roll forming is 0.05-0.1 mm. The gap between the two rollers of the roll press is a very important parameter, as it is related to the thickness of the base paper during roll forming. An excessively large gap will result in an excessively thick base paper; an excessively small gap will result in an excessively thin base paper, neither of which can meet the needs of production and processing.

[0039] A second aspect of the present invention provides a tobacco filter rod base paper obtained by the preparation method described above.

[0040] According to the base paper described above, the thickness of the filter rod base paper is 0.06-0.12 mm. Preferably, it is 0.06-0.1 mm.

[0041] Preferably, the longitudinal tensile strength of the filter rod base paper is 0.6-0.9 KN / m.

[0042] Preferably, the elongation at break of the filter rod base paper is 3-10%, more preferably 4-10%.

[0043] Preferably, the maximum load of the filter rod base paper is 10-12 N. More preferably, it is 10-11.5 N.

[0044] A third aspect of the present invention provides the application of the tobacco filter rod base paper as described above in the preparation of tobacco filter rods.

[0045] As described above, the present invention provides a method for preparing tobacco filter rod base paper, which uses tobacco powder, adhesive powder and wood pulp fiber as dry materials, uses reinforcing liquid as adhesive, and uses a roller press to press the materials into sheets to prepare tobacco filter rod base paper.

[0046] The filter rod base paper formed using the technical solution in this application has a dense structure, excellent tensile strength and elongation at break, and all performance indicators meet the processing performance requirements of paper filter rod substrates, thus serving as a substitute for paper filter rod base paper. The addition of specific wood pulp fiber powder ensures the strength of the base paper. Furthermore, the use of tobacco powder in the base paper enhances the aroma of cigarettes and reduces the "paper taste." Additionally, the roll forming process is simple, low-cost, and easy to produce and apply. Attached Figure Description

[0047] Figure 1 The diagram shows a schematic of the preparation process of tobacco filter rod base paper in an embodiment of the present invention.

[0048] Figure 2 The image shown is an illustration of the effect after the dry materials are mixed evenly in an embodiment of the present invention.

[0049] Figure 3 The image shown is an illustration of the effect after the enhancing liquid is mixed in an embodiment of the present invention.

[0050] Figure 4 The image shown is a material diagram of the mixture of the reinforcing liquid and dry material in an embodiment of the present invention.

[0051] Figure 5 The image shown is an effect diagram of the tobacco filter rod base paper prepared in Example 1 of the present invention.

[0052] Figure 6 The image shown is an effect diagram of the tobacco filter rod base paper prepared in Example 1 of the present invention.

[0053] Figure 7 The image shown is an effect diagram of the tobacco filter rod base paper prepared in Comparative Example 2 of the present invention.

[0054] Figure 8 The image shown is an effect diagram of the tobacco filter rod base paper prepared in Comparative Example 3 of the present invention. Detailed Implementation

[0055] The following specific examples illustrate the implementation of the present invention to verify its practical feasibility. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0056] It should be noted that the process equipment or apparatus not specifically specified in the following embodiments are all conventional equipment or apparatus in the art. Furthermore, it should be understood that the scope of protection of this invention is not limited to the specific embodiments described below. One or more method steps mentioned in this invention do not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. It should also be understood that the terminology used in the embodiments of this invention is for describing specific embodiments and not for limiting the scope of protection of this invention. Test methods not specifying specific conditions in the following embodiments are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0057] The applicant of this application proposes a novel method for preparing tobacco filter rod base paper. This method abandons the traditional papermaking process and creatively employs a mixture of dry material and reinforcing liquid, followed by roll pressing. The dry material serves as the base material, and the reinforcing liquid acts as an adhesive. The filter rod base paper formed using this technical solution has a dense structure, excellent tensile strength and elongation at break, and all performance indicators meet the processing requirements of paper filter rod substrates, thus serving as a substitute for paper filter rod base paper.

[0058] The following embodiments employ a specific method for preparing filter rod base paper, comprising the following steps:

[0059] 1) Preparation of reinforcing liquid: Mix propylene glycol, first glue powder, first wood pulp fiber and water evenly so that there are no lumps of particles after mixing and the mixture is a uniform milky white liquid, thus obtaining the reinforcing liquid;

[0060] 2) Preparation of dry material: Mix tobacco powder, second wood pulp fiber and second adhesive powder evenly to obtain dry material;

[0061] 3) Roll forming: The dry material and reinforcing liquid are mixed and then rolled to prepare the filter rod base paper;

[0062] 4) Drying: The obtained filter rod base paper is dried.

[0063] Preferably, in step 1), the first adhesive powder includes one or more of sodium carboxymethyl starch, microcrystalline cellulose, sodium hydroxypropyl cellulose, and sodium carboxymethyl cellulose.

[0064] More preferably, the sodium carboxymethyl starch has a degree of substitution of 0.4-0.6, and a viscosity (25°C) of 2% aqueous solution is 800-1200 mPa·s. In a specific embodiment, it is 800 MPa·s.

[0065] Preferably, the microcrystalline cellulose has a particle size of 30-60 μm and a bulk density of 0.26-0.31 g / cm³. 3 .

[0066] Preferably, the degree of substitution of the sodium hydroxypropyl cellulose is 2-3, and the viscosity of a 2% aqueous solution (25°C) is 800-1200 MPa·s. In a specific embodiment, the degree of substitution is 2.5, and the viscosity of a 2% aqueous solution (25°C) is 1000 MPa·s.

[0067] Preferably, the sodium carboxymethyl cellulose has a degree of substitution of 9-10 and a viscosity (25°C) of 800-1200 MPa·s for a 2% aqueous solution. In a specific embodiment, the degree of substitution is 9.7 and the viscosity (25°C) of a 2% aqueous solution is 1200 MPa·s.

[0068] Preferably, in step 1), the temperature for preparing the enhancing liquid is 50–80°C.

[0069] Preferably, the mass ratio of the dry material to the reinforcing liquid is 1-2:1.

[0070] Preferably, in the reinforcing liquid, based on the total mass of the reinforcing liquid, the content of propylene glycol is 20-40 wt%, the content of the first adhesive powder is 1-2 wt%, the content of the first wood pulp fiber is 0.5-2 wt%, and the content of water is 56-78.5 wt%.

[0071] Preferably, the particle size of the tobacco powder is 300-600 mesh.

[0072] Preferably, in step 4), the drying temperature is 90-100℃.

[0073] Preferably, in step 4), the drying time is 2-5 minutes.

[0074] Example 1

[0075] In this embodiment, a method for preparing filter rod base paper is provided, comprising the following steps:

[0076] 1) Preparation of the enhancement solution:

[0077] Take 20 kg of propylene glycol, 1 kg of sodium carboxymethyl starch, 0.5 kg of softwood pulp fiber (the softwood pulp fiber is 1 mm long and 1 μm wide), and 78.5 kg of water (water temperature 50℃), and mix them thoroughly to ensure that there are no clumps in the prepared reinforcing solution and that the reinforcing solution is a uniform milky white liquid.

[0078] 2) Preparation of dry materials:

[0079] Take 60 kg of tobacco powder, 10 kg of softwood pulp fiber, 3 kg of sodium carboxymethyl cellulose and 3 kg of sodium carboxymethyl starch and mix them evenly to obtain dry material.

[0080] The tobacco powder has a particle size of 300 mesh, and the softwood pulp fiber has a length of 1 mm and a width of 1 μm.

[0081] 3) Roll forming:

[0082] 70 kg of reinforcing liquid and 70 kg of dry material were mixed using an ultrafine grinder for 5 minutes. After thorough mixing, the tobacco powder was evenly adhered to the surface of the wood pulp fibers. After uniform mixing, the gap between the two rollers was set to 0.05 mm, and the rollers were rolled to form the filter rod base paper. The final thickness of the filter rod base paper was 0.06 mm.

[0083] 4) Drying:

[0084] The obtained filter rod base paper was dried at 100℃ for 2 minutes, and the moisture content of the base paper was 6% after drying.

[0085] Example 2

[0086] In this embodiment, a method for preparing filter rod base paper is provided, comprising the following steps:

[0087] 1) Preparation of the enhancement solution:

[0088] Take 30 kg of propylene glycol, 1.5 kg of sodium carboxymethyl starch, 1 kg of softwood pulp fiber (the softwood pulp fiber is 2 mm long and 2 μm wide), and 67.5 kg of water (water temperature 60℃), and mix them thoroughly to ensure that there are no clumps in the prepared reinforcing solution and that the reinforcing solution is a uniform milky white liquid.

[0089] 2) Preparation of dry materials:

[0090] Take 63 kg of tobacco powder, 7 kg of softwood pulp fiber, 3.083 kg of sodium carboxymethyl cellulose and 0.617 kg of sodium carboxymethyl starch, mix them evenly to obtain dry material.

[0091] The tobacco powder has a particle size of 450 mesh, and the softwood pulp fiber has a length of 2 mm and a width of 2 μm.

[0092] 3) Roll forming:

[0093] 53.85 kg of reinforcing liquid and 70 kg of dry material were mixed using an ultrafine grinder for 10 minutes. After thorough mixing, the tobacco powder was evenly adhered to the surface of the wood pulp fibers. After uniform mixing, the gap between the two rollers was set to 0.07 mm, and the rollers were rolled to form the filter rod base paper. The final thickness of the filter rod base paper was 0.08 mm.

[0094] 4) Drying:

[0095] The obtained filter rod base paper was dried at a temperature of 90℃ for 4 minutes, and the moisture content of the base paper after drying was 7%.

[0096] Example 3

[0097] In this embodiment, a method for preparing filter rod base paper is provided, comprising the following steps:

[0098] 1) Preparation of the enhancement solution:

[0099] Take 40 kg of propylene glycol, 2 kg of sodium hydroxypropyl cellulose, 2 kg of softwood pulp fiber (the softwood pulp fiber is 4 mm long and 4 μm wide), and 56 kg of water (water temperature 80℃), and mix them thoroughly to ensure that there are no clumps in the prepared reinforcing solution and that the reinforcing solution is a uniform milky white liquid.

[0100] 2) Preparation of dry materials:

[0101] Take 65 kg of tobacco powder, 5 kg of softwood pulp fiber, 2.57 kg of sodium carboxymethyl cellulose and 0.26 kg of sodium carboxymethyl starch, mix them evenly to obtain dry material.

[0102] The tobacco powder has a particle size of 600 mesh, and the softwood pulp fiber has a length of 4 mm and a width of 4 μm.

[0103] 3) Roll forming:

[0104] 46.67 kg of reinforcing liquid and 70 kg of dry material were mixed using an ultrafine grinder for 15 minutes. After thorough mixing, the tobacco powder was evenly adhered to the surface of the wood pulp fibers. After uniform mixing, the gap between the two rollers was set to 0.09 mm, and the rollers were rolled to form the filter rod base paper. The final thickness of the filter rod base paper was 0.1 mm.

[0105] 4) Drying:

[0106] The obtained filter rod base paper was dried at a temperature of 95℃ for 5 minutes, resulting in a moisture content of 10% after drying.

[0107] Example 4

[0108] 1) Preparation of the enhancement solution:

[0109] In Example 1, 1 kg of sodium carboxymethyl starch was replaced with 1 kg of microcrystalline cellulose, and all other conditions were exactly the same as in Example 1.

[0110] 2) Preparation of dry materials:

[0111] Same as Example 1.

[0112] 3) Roll forming:

[0113] Same as Example 1.

[0114] 4) Drying:

[0115] Same as Example 1.

[0116] Example 5

[0117] 1) Preparation of the enhancement solution:

[0118] Same as Example 1.

[0119] 2) Preparation of dry materials:

[0120] Except for the addition of 3 kg of sodium hydroxypropyl cellulose and 3 kg of microcrystalline cellulose as the second adhesive powder, the other conditions were exactly the same as in Example 1.

[0121] 3) Roll forming:

[0122] Same as Example 1.

[0123] 4) Drying:

[0124] Same as Example 1.

[0125] Comparative Example 1

[0126] 1) Preparation of the enhancement solution:

[0127] Same as Example 3.

[0128] 2) Preparation of dry materials:

[0129] Same as Example 3.

[0130] 3) Roll forming:

[0131] Except for mixing 46.67 kg of reinforcing liquid and 95 kg of dry material, the other conditions were the same as in Example 3; the final thickness of the filter rod base paper was 0.096 mm.

[0132] 4) Drying:

[0133] Same as Example 3.

[0134] Comparative Example 2

[0135] 1) Preparation of the enhancement solution:

[0136] Same as Example 3.

[0137] 2) Preparation of dry materials:

[0138] Same as Example 3.

[0139] 3) Roll forming:

[0140] Except for mixing 46.67 kg of reinforcing liquid and 35 kg of dry material, the other conditions were the same as in Example 3; ultimately, due to the excessively high proportion of reinforcing liquid in the mixture, paper breakage occurred during the rolling process, resulting in the inability to obtain filter rod base paper.

[0141] Comparative Example 3

[0142] 1) Preparation of the enhancement solution:

[0143] Same as Example 1.

[0144] 2) Preparation of dry materials:

[0145] Same as Example 1.

[0146] 3) Roll forming:

[0147] Except for the 1.6mm gap between the two rollers, the other conditions were exactly the same as in Example 1; the final thickness of the filter rod base paper was 1.80mm, which did not meet the thickness requirements.

[0148] 4) Drying:

[0149] Same as Example 1.

[0150] Comparative Example 4

[0151] 1) Preparation of the enhancement solution:

[0152] Same as Example 1.

[0153] 2) Preparation of dry materials:

[0154] Same as Example 1.

[0155] 3) Roll forming:

[0156] Except for the gap between the two rollers being 0.03 mm, the other conditions were exactly the same as in Example 1; the final thickness of the filter rod base paper was 0.04 mm, which did not meet the thickness requirements, and because the base paper was too thin, the product was easily broken.

[0157] 4) Drying:

[0158] Same as Example 1.

[0159] Comparative Example 5

[0160] 1) Preparation of the enhancement solution:

[0161] Same as Example 1.

[0162] 2) Preparation of dry materials:

[0163] Except for not adding a second adhesive powder, the other conditions are exactly the same as in Example 1; that is, 60 kg of tobacco powder and 10 kg of softwood pulp fiber are mixed evenly to obtain dry material.

[0164] The tobacco powder has a particle size of 300 mesh, and the softwood pulp fiber has a length of 1 mm and a width of 1 μm.

[0165] 3) Roll forming:

[0166] Same as Example 1.

[0167] 4) Drying:

[0168] Similar to Example 1, the moisture content of the base paper after drying was 6%.

[0169] Comparative Example 6

[0170] 1) Preparation of the enhancement solution:

[0171] Same as Example 1.

[0172] 2) Preparation of dry materials:

[0173] Except for the absence of a second wood pulp fiber, the other conditions were exactly the same as in Example 1; that is, 60 kg of tobacco powder, 3 kg of sodium carboxymethyl cellulose and 3 kg of sodium carboxymethyl starch were mixed evenly to obtain dry material.

[0174] The tobacco powder has a particle size of 300 mesh.

[0175] 3) Roll forming:

[0176] Same as Example 1.

[0177] 4) Drying:

[0178] The obtained filter rod base paper was dried at 100℃ for 2 minutes, and the moisture content of the base paper was 6% after drying.

[0179] Comparative Example 7

[0180] 1) Preparation of the enhancement solution:

[0181] Same as Example 1.

[0182] 2) Preparation of dry materials:

[0183] Only 60 kg of tobacco powder with a particle size of 300 mesh was used.

[0184] 3) Roll forming:

[0185] Same as in Example 1; the final thickness of the filter rod base paper is 0.093 mm.

[0186] 4) Drying:

[0187] Same as Example 1.

[0188] The filter rod base paper prepared in Examples 1-5 and Comparative Examples 1-7 was tested for thickness, longitudinal tensile strength, elongation at break and maximum load.

[0189] The longitudinal tensile strength, elongation at break, and maximum load are tested according to the national standard GB / T 12914-2008. Specifically, the thickness of the base paper must be 0.1±0.04mm, the tensile strength ≥0.6KN / m, the elongation at break 3~10%, and the maximum load ≥10N.

[0190] The specific test results are shown in Table 1.

[0191] Table 1

[0192]

[0193] As shown in Table 1, the filter rod base paper obtained in Examples 1-5 of this application has a thickness of 0.06-0.1 mm, a longitudinal tensile strength of 0.6-0.9 KN / m, an elongation at break of 4-11%, and a maximum load of 10-12 N, which meets the requirements for subsequent processing applications. Comparative Examples 1 and 2 show that in Comparative Example 1, the longitudinal tensile strength of the obtained filter rod base paper is low, only 0.36 KN / m, and the elongation at break is 2%, indicating that the base paper is relatively soft and its strength is reduced, failing to meet the requirements for subsequent production applications. In Comparative Example 2, when the proportion of reinforcing liquid in the raw materials is too high, the base paper cannot be formed, and filter rod base paper cannot be obtained. This indicates that the ratio of reinforcing liquid to dry material in the preparation scheme of this application needs to meet a specific range to achieve good technical results. Comparative Examples 3 and 4 show that the parameter range of the roller press is very important. An excessively large gap between the two rollers will result in an excessively thick base paper; conversely, an excessively small gap will result in an excessively thin base paper, neither of which meets the needs of production processing. Comparative Examples 5, 6, and 7 show that the components in the dry stock are specific and cannot be arbitrarily increased or decreased; otherwise, the base paper will be too soft, and the longitudinal tensile strength will decrease, failing to meet the requirements of subsequent processing applications.

[0194] Therefore, the technical solution of this application, by adjusting the composition of the reinforcing liquid, the composition of the dry material, and the mixing ratio of the dry material and the reinforcing liquid, and by using a roll forming method with specific parameters, can prepare a filter rod base paper with a certain thickness, good strength, and aroma-enhancing effect on cigarettes. All its indicators can meet the requirements of subsequent processing applications.

[0195] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing tobacco filter rod base paper, characterized in that, The preparation method includes the following steps: mixing dry material and reinforcing liquid, and preparing filter rod base paper by roll forming; The raw material components of the reinforcing liquid include propylene glycol, first adhesive powder, and first wood pulp fiber; The raw material components of the dry material include tobacco powder, second wood pulp fiber, and second adhesive powder; The mass ratio of the dry material to the reinforcing liquid is 1-2:1; In the dry material, the mass ratio of second wood pulp fiber to tobacco powder is 1:6-15; In the dry material, the mass ratio of the second adhesive powder to the tobacco powder is 1:10-23; The first wood pulp fiber has a length of 0.7-4 mm and a width of 10-40 μm; The second wood pulp fiber has a length of 0.7-4 mm and a width of 10-40 μm; The reinforcing liquid also includes water. Based on the total mass of the reinforcing liquid, the content of propylene glycol is 15-45 wt%, the content of the first adhesive powder is 0.5-5 wt%, the content of the first wood pulp fiber is 0.3-4 wt%, and the content of water is 50-84 wt%. The gap between the two rollers during roll forming is 0.05-0.1 mm.

2. The preparation method according to claim 1, characterized in that, After obtaining the filter rod base paper, it is dried; And / or, the first adhesive powder includes one or more of sodium carboxymethyl starch, microcrystalline cellulose, sodium hydroxypropyl cellulose, and sodium carboxymethyl cellulose; And / or, the first wood pulp fiber includes one or more of softwood pulp fiber and hardwood pulp fiber; And / or, the particle size of the tobacco powder is 200-650 mesh; And / or, the preparation temperature of the enhancing liquid is 40~90℃.

3. The preparation method according to claim 1, characterized in that, The second wood pulp fiber includes one or more of softwood pulp fiber and hardwood pulp fiber; And / or, the second adhesive powder includes one or more of sodium carboxymethyl starch, microcrystalline cellulose, sodium hydroxypropyl cellulose, and sodium carboxymethyl cellulose; And / or, the drying temperature is 80-105℃.

4. The preparation method according to claim 2 or 3, characterized in that, The degree of substitution of the sodium carboxymethyl starch is 0.4-1, and the viscosity of a 2% aqueous solution at 25°C is 800-1200 MPa•s. And / or, the degree of substitution of the sodium carboxymethyl cellulose is 8-12, and the viscosity of a 2% aqueous solution at 25°C is 800-1200 MPa•s; And / or, the microcrystalline cellulose has a particle size of 30-60 μm and a bulk density of 0.22-0.35 g / cm³. 3 ; And / or, the degree of substitution of the sodium hydroxypropyl cellulose is 2-5, and the viscosity of a 2% aqueous solution at 25°C is 800-1200 MPa•s.

5. The preparation method according to claim 1, characterized in that, The pressure during the roll forming process is 5~150kN / m.

6. A tobacco filter rod base paper, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 5.

7. The tobacco filter rod base paper according to claim 6, characterized in that, The thickness of the filter rod base paper is 0.06-0.12 mm; And / or, the longitudinal tensile strength of the filter rod base paper is 0.6-0.9 kN / m; And / or, the breaking elongation of the filter rod base paper is 3-10%; And / or, the maximum load on the filter rod base paper is 10~12N.

8. The use of the tobacco filter rod base paper as described in any one of claims 6 or 7 as a substrate in the preparation of tobacco filter rods.

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