Preparation method of filter stick filling paper

Abstract

The invention discloses a preparation method of filter stick filling paper. The preparation method comprises the following steps: mixing carboxymethylation modified fiber pulp and regenerated cellulose fiber pulp to obtain first mixed pulp; adding broken basil leaves into the first mixed slurry to obtain second mixed slurry; adding a wet strength agent into the second mixed slurry to obtain sizing slurry; sequentially carrying out dehydration treatment, squeezing treatment and drying treatment on the sizing slurry to obtain raw paper of the filling paper; and dipping the raw paper of the filling paper into food-grade basil essence, and treating to obtain the filling paper. A fiber skeleton structure with relatively high strength is formed by the carboxymethyl fibers and the regenerated cellulose fibers; the crushed basil leaves and the regenerated cellulose fibers are bonded by the dissolved carboxymethyl fibers, so that the strength of a fiber skeleton can be further improved, and the fragrance can be enriched; and the binding force between the regenerated cellulose fibers is weak, so that the prepared filling paper has the characteristic of softness, the prepared filling paper has balanced strength and softness, and the cigarette sensory quality can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of papermaking, and more particularly to a method for preparing filter rod filling paper. Background Art

[0002] Cigarette filters can filter out some harmful substances in mainstream smoke and reduce the safety risks of mainstream smoke to the human body and the environment. As consumers pay more attention to smoking, health and environmental protection, the market has higher and higher requirements for cigarettes, and tar reduction and harm reduction and environmental protection have become the development trend of the tobacco industry at home and abroad. Cigarette filter rods are composed of filler materials (or filter materials) wrapped in forming paper, which are compounded with cigarettes through tipping paper. The selection and design of the filler materials have a significant impact on the tar reduction and harm reduction and smoking quality of cigarettes. At present, the filter rod filling material of cigarette products generally uses diacetate fiber tow. Although it has the advantages of good suction feeling and strong plasticity, acetate fiber has the disadvantages of poor degradability and dependence on imported raw materials for production. In addition, as a synthetic fiber, acetate fiber has limited interception effect on harmful substances in mainstream smoke. Due to the poor degradability of acetate fiber, when the filter rod filled with acetate fiber material is discarded, it causes land and water environmental pollution, and even becomes one of the main sources of plastic pollution.

[0003] Compared with acetate filter rods, paper filter rods (with filling paper as the filling material) have stronger biodegradability, and at the same filtration pressure drop, they have better interception effect on tar and carbon monoxide in flue gas. Paper filter rods made of paper-based filling materials fully meet the development needs of low-tar harm reduction and green environmental protection. Domestic and foreign cigarette and related filter rod auxiliary material manufacturers are planning or increasing the research and development of paper filter rods. At present, the filling paper used in paper filter rods is basically made of virgin whole wood pulp, which has the disadvantages of unstable suction resistance and poor sensory quality when smoking cigarettes (obvious "paper taste" and insufficient aroma). Poor suction feeling is the main reason limiting the large-scale application of paper filter rods. In order to improve the sensory quality, research has developed wood pulp-acetate composite filling paper (CAP). The resulting composite filter rod (CAPF) is used in corresponding cigarettes. Its tar reduction efficiency is higher than that of pure acetate filter rods, and its smoking taste is better than that of pure wood pulp filter rods. However, the wood pulp-acetate composite filling paper has problems such as low pulping efficiency and easy powder and hair loss. In addition, the filling paper still contains some acetate, which is not environmentally friendly in the long run.

[0004] Therefore, there is an urgent need to develop green, easily degradable, high interception efficiency, good sensory quality, and easy industrialization filter rod filling paper, so as to provide an environmentally friendly and healthy filter rod solution for the cigarette industry. Therefore, the present invention provides a preparation method of filter rod filling paper. Summary of the invention

[0005] In view of this, the present invention provides a method for preparing filter rod filling paper, comprising:

[0006] Mixing carboxymethyl modified fiber slurry and regenerated cellulose fiber slurry to obtain a first mixed slurry, wherein the mass of the carboxymethyl modified fiber slurry accounts for 10% to 60% of the mass of the first mixed slurry, and the mass of the regenerated cellulose fiber slurry accounts for 40% to 90% of the mass of the first mixed slurry;

[0007] Adding chopped basil leaves to the first mixed slurry to obtain a second mixed slurry, wherein the mass of the chopped basil leaves accounts for 0.1% to 5% of the absolute dry fiber mass of the second mixed slurry;

[0008] adding a wet strength agent to the second mixed slurry to obtain a sizing slurry;

[0009] The sizing slurry is subjected to dehydration treatment, pressing treatment and drying treatment in sequence to obtain a filling paper base paper;

[0010] The filling paper base paper is impregnated with food-grade basil essence and then subjected to rolling treatment and drying treatment in sequence to obtain the filling paper.

[0011] Optionally, the mass of the wet strength agent accounts for 0.1 to 0.5% of the absolute dry fiber mass of the sizing slurry.

[0012] Optionally, the amount of food-grade basil essence applied to the absolutely dry filling paper is in the range of 0.5 g / m 2 Up to 2g / m 2 .

[0013] Optionally, the degree of substitution of the carboxymethyl fiber in the carboxymethylated modified fiber slurry ranges from 0.2 to 0.5.

[0014] Optionally, the carboxymethylated modified fiber pulp is any one of carboxymethylated modified coniferous wood pulp, carboxymethylated modified hemp pulp, and carboxymethylated modified bamboo pulp.

[0015] Optionally, the average fiber length of the carboxymethylated modified fiber slurry ranges from 1.2 mm to 4 mm, and the beating degree of the carboxymethylated modified fiber slurry ranges from 20°SR to 80°SR.

[0016] Optionally, the regenerated cellulose fiber pulp is at least one of lyocell fiber pulp and viscose fiber pulp.

[0017] Optionally, the average fiber length of the regenerated cellulose fiber pulp ranges from 3 mm to 10 mm, the average fiber width of the regenerated cellulose fiber pulp ranges from 10 μm to 30 μm, the beating degree of the lyocell fiber pulp ranges from 8°SR to 25°SR, and the beating degree of the viscose fiber pulp is 8°SR.

[0018] Optionally, the drying temperature during the drying process ranges from 60°C to 80°C.

[0019] Optionally, the basil leaves have a mesh size range of 40 to 200.

[0020] Compared with the prior art, the preparation method of the filter rod filling paper provided by the present invention achieves at least the following beneficial effects:

[0021] The preparation method of filter rod filling paper provided by the present invention comprises the following steps: mixing carboxymethyl modified fiber slurry and regenerated cellulose fiber slurry to obtain a first mixed slurry; adding chopped basil leaves to the first mixed slurry to obtain a second mixed slurry; adding a wet strength agent to the second mixed slurry to obtain a sizing slurry; subjecting the sizing slurry to dehydration treatment, pressing treatment and drying treatment in sequence to obtain a filling paper base paper; and impregnating the filling paper base paper with food-grade basil essence and subjecting the same to rolling treatment and drying treatment in sequence to obtain the filling paper. The carboxymethyl modified fiber slurry contains carboxymethyl fiber, which is partially dissolved and the other part is not dissolved and remains in fibrous form; the regenerated cellulose fiber slurry contains regenerated cellulose fiber, and the undissolved carboxymethyl fiber and the regenerated cellulose fiber are physically interwoven and entangled to form a fiber skeleton structure of the filling paper; since the carboxymethyl fiber is rich in carboxyl groups and hydroxyl groups, hydrogen bonds are formed between the fibers to increase the strength of the fiber skeleton; the dissolved carboxymethyl fiber bonds the chopped basil leaves with the regenerated cellulose fibers to further increase the strength of the fiber skeleton; and the regenerated cellulose fibers are bonded to each other. The binding force is weak, which can give the prepared filling paper a soft characteristic. The soft filling paper filled in the filter rod has a relatively uniform pore size, and the interception and penetration of smoke are moderate and uniform, which is helpful for the sensory evaluation of cigarette products; because the basil leaves and food-grade basil essence themselves have aroma, when the smoke flows through the filling paper, the basil aroma is emitted, which can enrich the aroma of the smoke, reduce the woody smell of the filling paper, and improve the sensory quality of cigarettes; carboxymethyl modified fiber pulp, regenerated cellulose fiber pulp and basil leaves are all green and easily degradable materials, and can also avoid or reduce pollution to the environment. In addition, the preparation method of the filter rod filling paper provided by the present invention has simple raw materials, convenient operation, and easy industrialization.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0023] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 The present invention is a schematic flow chart of a method for preparing filter rod filling paper provided by the present invention. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0027] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0028] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0029] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0030] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] Combination Figure 1 , Figure 1 The present invention provides a method for preparing filter rod filling paper, which includes:

[0032] S101: mixing carboxymethyl modified fiber slurry and regenerated cellulose fiber slurry to obtain a first mixed slurry, wherein the mass of the carboxymethyl modified fiber slurry accounts for 10% to 60% of the mass of the first mixed slurry, and the mass of the regenerated cellulose fiber slurry accounts for 40% to 90% of the mass of the first mixed slurry;

[0033] S102: adding crushed basil leaves to the first mixed slurry to obtain a second mixed slurry, wherein the mass of the crushed basil leaves accounts for 0.1% to 5% of the absolute dry fiber mass of the second mixed slurry;

[0034] S103: adding a wet strength agent to the second mixed slurry to obtain a sizing slurry;

[0035] S104: Dehydrating, pressing and drying the sizing slurry in sequence to obtain a base paper for filling paper;

[0036] S105: The base paper of the filling paper is impregnated with food-grade basil essence and then subjected to roller pressing and drying in sequence to obtain the filling paper.

[0037] It should be noted that in step S101, the mass of the carboxymethyl modified fiber slurry may account for 10%, 20%, 30%, 40%, 50% or 60% of the mass of the first mixed slurry, or any value between 10% and 60%. The mass of the regenerated cellulose fiber slurry may account for 40%, 50%, 60%, 70%, 80% or 90% of the mass of the first mixed slurry, or any value between 10% and 60%. The regenerated cellulose fiber slurry is mainly used to achieve air permeability and softness, and the carboxymethyl modified fiber slurry is mainly used to improve strength. The sum of the masses of the two is the mass of the first mixed slurry. The ratio of the carboxymethyl modified fiber slurry and the regenerated cellulose fiber slurry can be adjusted within a given range according to actual needs, taking into account the strength, softness and air permeability of the filling paper. In step S102, the proportion of the mass of basil shreds in the absolute dry fiber mass of the second mixed slurry can be 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%, or any value between 0.1% and 5%. If the proportion of the mass of basil shreds in the absolute dry fiber mass of the second mixed slurry is less than 0.1%, the amount of basil shreds is small, and there is no improvement effect on the sensory organs or aroma; if the proportion of the mass of basil shreds in the absolute dry fiber mass of the second mixed slurry is greater than 5%, the basil shreds are widely distributed in the subsequent filling paper, affecting the appearance, forming uniformity and strength properties of the filling paper, and also having an adverse effect on the sensory organs. In step S103, the wet strength agent can be a polyamide epichlorohydrin resin (PAE) wet strength agent, of course, it is not limited to this, and can be selected according to actual needs. The mass of the first mixed slurry accounts for 94.5% to 99.8% of the mass of the sizing slurry, and the ... depends on the mass of the basil shreds and the wet strength agent added. In step S104, the dehydration treatment, the pressing treatment and the drying treatment can all adopt the existing papermaking process conditions. In step S105, the excess food-grade basil essence is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. By impregnating the filling paper base paper with food-grade basil essence, the basil aroma of the filling paper can be further increased, the woody odor of the filling paper can be further reduced, the aroma of the smoke can be enriched, and the sensory quality of the cigarette can be improved.

[0038] It is understandable that the regenerated cellulose fiber slurry contains regenerated cellulose fibers, and the carboxymethyl modified fiber slurry contains carboxymethyl fibers. The carboxymethyl fibers are partially dissolved, and the other part is not dissolved and still in fibrous form. The undissolved carboxymethyl fibers and the regenerated cellulose fibers are physically interwoven and entangled to form a fiber skeleton structure of the filling paper. Since the carboxymethyl fibers are rich in carboxyl and hydroxyl groups, hydrogen bonds are formed between the fibers, which can increase the strength of the fiber skeleton. The dissolved carboxymethyl fibers bond the basil leaves to the regenerated cellulose fibers, which can further increase the strength of the fiber skeleton. The weak bonding force between the regenerated cellulose fibers can give the prepared filling paper a soft characteristic, which is helpful for filling the filling paper in the filter rod. After the filling paper is filled in the filter rod, the softness, air permeability and other properties of the paper will affect the microstructure of the filling paper in the filter rod. The filter rod made of stiff filling paper has more and uneven longitudinal large pores, large fluctuations in suction resistance, and poor sensory quality. The filling paper prepared by the method of the present invention is soft and breathable. After embossing and bending, it is filled into the filter rod. The pore size of the filling paper filled in the filter rod is relatively uniform, which is helpful for regulating the suction resistance of the filter rod, and the interception and penetration of smoke are moderate and uniform, which is helpful for the sensory evaluation of cigarette products. Therefore, the carboxymethyl modified fiber pulp, regenerated cellulose fiber pulp and basil shredded leaves work synergistically to balance the performance requirements of softness and strength to meet the strength use of the filling paper after processing and the performance requirements of the filter rod. Since basil leaves and food-grade basil essence have aroma, when smoke flows through the filling paper, the basil aroma is released, which can enrich the aroma of smoke, reduce the woody smell of the filling paper, and improve the sensory quality of cigarettes; carboxymethyl modified fiber slurry, regenerated cellulose fiber slurry and basil leaves are all green and easily degradable materials, and can also avoid or reduce pollution to the environment. In addition, the preparation method of the filter rod filling paper provided by the present invention has simple raw materials, convenient operation, and easy industrialization.

[0039] Optionally, the mass of the wet strength agent accounts for 0.1 to 0.5% of the absolute dry fiber mass of the sizing stock.

[0040] It is understood that the mass of the wet strength agent may account for 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5% of the absolute dry fiber mass of the sizing slurry, or any value between 0.1% and 5%. The wet strength agent is mainly used to increase the wet strength to facilitate the subsequent impregnation operation, otherwise the paper sheet is easy to break during the impregnation.

[0041] Optionally, the amount of food-grade basil essence applied to the absolutely dry filling paper is in the range of 0.5g / m 2 Up to 2g / m 2 .

[0042] It is understandable that if the amount of food-grade basil essence applied to the absolutely dry filling paper is less than 0.5g / m 2, the flavoring effect is not obvious; if the amount of food-grade basil essence applied to the absolutely dry filling paper is greater than 2g / m 2 , which easily leads to a strong exogenous aroma. When the prepared filling paper is used in cigarettes, the strong aroma will affect the tobacco aroma of the cigarette leaf group itself, resulting in a decrease in sensory quality. Therefore, the gluing range of food-grade basil essence on the absolutely dry filling paper is set to 0.5g / m 2 Up to 2g / m 2 Specifically, the amount of food-grade basil essence applied to the absolutely dry filling paper can be 0.5g / m 2 , 1g / m 2 , 1.5g / m 2 or 2g / m 2 , or 0.5g / m 2 Up to 2g / m 2 Any value in .

[0043] Optionally, the degree of substitution of the carboxymethyl fiber in the carboxymethylated modified fiber slurry ranges from 0.2 to 0.5.

[0044] It is understandable that the degree of substitution of carboxymethyl fiber in the carboxymethylated modified fiber slurry can be 0.2, 0.3, 0.4 or 0.5, or any value between 0.2 and 0.5, to avoid too small a degree of substitution, which results in less carboxymethyl fiber dissolving, leading to reduced bonding effect of the dissolved carboxymethyl fiber on basil leaves and regenerated cellulose fibers; and to avoid too large a degree of substitution, which results in a large amount of carboxymethyl fiber dissolving.

[0045] Optionally, the carboxymethylated modified fiber pulp is any one of carboxymethylated modified coniferous wood pulp, carboxymethylated modified hemp pulp, and carboxymethylated modified bamboo pulp.

[0046] Optionally, the average fiber length of the carboxymethylated modified fiber slurry is in the range of 1.2 mm to 4 mm, and the beating degree of the carboxymethylated modified fiber slurry is in the range of 20°SR to 80°SR.

[0047] It is understandable that the average fiber length of the carboxymethyl modified fiber slurry and the degree of substitution together constrain the modification degree of the carboxymethyl modified fiber in the carboxymethyl modified fiber slurry, that is, the modification degree of the carboxymethyl fiber. If the average fiber length of the carboxymethyl modified fiber slurry is less than 1.2 mm, it may lead to a severe modification degree and excessive dissolved components; if the average fiber length of the carboxymethyl modified fiber slurry is greater than 4 mm, it will cause the fiber mixing and papermaking uniformity of the regenerated cellulose fiber slurry to deteriorate. Specifically, the average fiber length of the carboxymethyl modified fiber slurry can be 1.2 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm or 4 mm, or any value from 1.2 mm to 4 mm. The beating degree of the carboxymethyl modified fiber slurry is set to range from 20°SR to 80°SR. If the beating degree of the carboxymethyl modified fiber slurry is less than 20°SR, the strength of the generated filling paper will be poor; if the beating degree of the carboxymethyl modified fiber slurry is greater than 80°SR, the subsequent water filtration efficiency will be slow. Specifically, the beating degree of the carboxymethyl modified fiber slurry can be 20°SR, 30°SR, 40°SR, 50°SR, 60°SR, 70°SR or 80°SR, and of course, it can also be any value between 20°SR and 80°SR.

[0048] Optionally, the regenerated cellulose fiber pulp is at least one of lyocell fiber pulp and viscose fiber pulp.

[0049] It should be noted that the most widely used regenerated cellulose fibers in the papermaking industry are lyocell fiber pulp and viscose fiber pulp. Therefore, lyocell fiber pulp and viscose fiber pulp are easy to obtain, which is beneficial to reduce the difficulty and production cost of preparing filling paper.

[0050] Optionally, the average fiber length of the regenerated cellulose fiber pulp ranges from 3 mm to 10 mm, the average fiber width of the regenerated cellulose fiber pulp ranges from 10 μm to 30 μm, the beating degree of the lyocell fiber pulp ranges from 8°SR to 25°SR, and the beating degree of the viscose fiber pulp is 8°SR.

[0051] It is understandable that if the average fiber length of the regenerated cellulose fiber slurry is less than 3mm, it will affect the strength of the filling paper; if the average fiber length of the regenerated cellulose fiber slurry is greater than 10mm, it will cause the first mixed slurry to be entangled, which is not conducive to forming, and will also cause the uniformity of the obtained filling paper to be poor. Specifically, the average fiber length of the regenerated cellulose fiber slurry can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, or any value from 3mm to 10mm. If the average fiber width of the regenerated cellulose fiber slurry is less than 10μm, the fiber is too thin, which is not conducive to the air permeability of the filling paper; if the average fiber width of the regenerated cellulose fiber slurry is greater than 30μm, it is not conducive to the softness and strength properties of the filling paper. Specifically, the average fiber width of the regenerated cellulose fiber slurry can be 10μm, 15μm, 20μm, 25μm or 30μm, or any value from 10μm to 30μm. The beating degree range of the lyocell fiber pulp is set to 8°SR to 25°SR in order to avoid the softness of the obtained filling paper being reduced due to the lyocell fiber pulp beating degree being too high, and to avoid the subsequent filling paper being used in cigarettes, resulting in the sensory quality of the cigarettes being deteriorated. Specifically, the beating degree of the lyocell fiber pulp can be 8°SR, 10°SR, 15°SR, 20°SR or 25°SR. Of course, it can also be any value between 8°SR and 25°SR. Viscose fiber does not need to be beaten, and beating can only cut it but not separate it into fibers, so the beating degree is fixed. Lyocell fiber can be fibrillated by beating, and presents different beating degrees according to the degree of fibrillation.

[0052] Optionally, the drying temperature during the drying process ranges from 60°C to 80°C.

[0053] It is understood that the drying temperature during the drying process can be 60°C, 65°C, 70°C, 75°C or 80°C, or any value between 60°C and 80°C. If the drying temperature is less than 60°C, the drying efficiency is low; if the drying temperature is greater than 80°C, the food-grade basil essence is likely to volatilize in large quantities, resulting in aroma loss.

[0054] Optionally, the basil leaves are shredded into a mesh size ranging from 40 mesh to 200 mesh.

[0055] It is understandable that if the shredded basil leaves have a mesh size of less than 40, the shredded basil leaves are too fine and easy to be lost, and the retention of the shredded basil leaves in the filling paper is poor; if the shredded basil leaves have a mesh size of more than 200, the shredded basil leaves are too coarse, resulting in large particles, which are dispersed in the paper and affect the bonding strength between the fibers. Specifically, the shredded basil leaves may have a mesh size of 40, 50, 75, 80, 100, 120, 125, 150, 160, 175, 180 or 200. Of course, it may also be any value between 40 and 200, and this embodiment does not impose any specific limitation on this.

[0056] The quantitative value, tightness, tensile strength, tensile energy absorption, air permeability and softness of the filling paper were determined with reference to standards GB / T451.2-2023, GB / T451.3-2002, GB / T12914-2018, GB / T23227-2008, GB / T8942-2016 and GB / T5605.4-2005, and the sensory quality evaluation of the cigarette using the filling paper prepared by the method of the present invention as the filling material was determined with reference to expert opinions.

[0057] The quantitative range of the filled paper prepared by the method of the present invention is 25g / m 2 Up to 50g / m 2 , tightness range is 0.2g / cm 3 Up to 0.5g / cm 3 , tensile strength range is 3N to 10N, tensile energy absorption range is 1J / m 2 Up to 10J / m 2 The air permeability ranges from 5000CU to 40000CU, the softness value ranges from 400mN to 1000mN, the cigarette aroma is sufficient, delicate and has a sweet aftertaste, and the sensory quality evaluation score is 0.5 to 5 points higher than that of the filling paper made by the prior art.

[0058] The present invention provides several specific embodiments, as follows:

[0059] Control group

[0060] The fiber raw material is 100% coniferous wood pulp, the beating degree of the coniferous wood pulp is 14°SR, the average fiber length of the coniferous wood pulp is 2.7 mm, and the coniferous wood pulp is dehydrated, formed, pressed and dried to obtain the pure wood pulp filling paper.

[0061] After testing, the weight of the filling paper is 39.2g / m 2 , tightness is 0.348g / cm 3 , tensile strength is 17.2N, tensile energy absorption is 11.1J / m 2 The air permeability is 4282CU, the softness value is 1782mN, and the filter rods are made of embossed filling paper rods, which are assembled into cigarettes and subjected to sensory evaluation. The sensory quality score is 85.5 points.

[0062] Comparative Example

[0063] The fiber raw materials are virgin coniferous pulp and lyocell fiber pulp. The average length of coniferous pulp fiber is 2.6 mm, the beating degree of virgin coniferous pulp is 55°SR, accounting for 30% by mass, the average length of lyocell fiber is 5 mm, the average width is 10 μm, the beating degree of lyocell fiber pulp is 8°SR, accounting for 70% by mass, and after the two pulps are mixed, basil shreds are added and mixed evenly to obtain a mixed pulp. The fineness of the basil shreds is 80 mesh, and the amount of basil shreds added accounts for 0.5% of the absolute dry fiber mass of the mixed pulp. Polyamide epichlorohydrin resin wet strength agent is added to the mixed pulp to obtain a sizing pulp, and the mass of the polyamide epichlorohydrin resin wet strength agent accounts for 0.2% of the absolute dry fiber mass of the sizing pulp. The sizing pulp is dehydrated, pressed and dried to obtain the filling paper base paper.

[0064] The base paper of the filling paper is impregnated with food-grade basil essence. After impregnation, the excess impregnation liquid is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. The drying temperature is 80℃. The amount of basil essence applied to the absolutely dry filling paper is 1.7g / m 2 .

[0065] After testing, the weight of the filling paper is 41.7g / m 2 , tightness is 0.251g / cm 3 , tensile strength is 2.70N, tensile energy absorption is 0.91J / m 2 The air permeability is 37310CU, the softness value is 828mN, and the sensory evaluation score is 3.1 points higher than that of the control group.

[0066] Example 1

[0067] The fiber raw materials are carboxymethylated Manila pulp and viscose fiber pulp. The carboxymethyl substitution degree of the carboxymethyl Manila pulp is 0.3, the average fiber length is 3.2 mm, the beating degree is 38°SR, and the mass accounts for 35%. The average length of the viscose fiber is 3 mm, the average width is 15 μm, and the mass accounts for 65%. After the two pulps are mixed, basil shreds are added and mixed evenly to obtain a mixed pulp. The fineness of the basil shreds is 80 mesh, and the addition amount of the basil shreds accounts for 0.5% of the absolute dry fiber mass of the mixed pulp. A polyamide epichlorohydrin resin wet strength agent is added to the mixed pulp to obtain a sizing pulp, and the mass of the polyamide epichlorohydrin resin wet strength agent accounts for 0.2% of the absolute dry fiber mass of the sizing pulp. The sizing pulp is dehydrated, pressed and dried to obtain a filling paper base paper.

[0068] The base paper of the filling paper is impregnated with food-grade basil essence. After impregnation, the excess impregnation liquid is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. The drying temperature is 70℃. The amount of basil essence applied to the absolutely dry filling paper is 1.2g / m 2 .

[0069] After testing, the weight of the filling paper is 38g / m 2, tightness is 0.338g / cm 3 , tensile strength is 4.45N, tensile energy absorption is 4.08J / m 2 The air permeability is 10152CU, the softness value is 1185mN, and the cigarettes are assembled with the same tobacco and cigarette paper as the control group. The sensory evaluation score is 1.1 points higher than that of the control group.

[0070] Example 2

[0071] The fiber raw materials are carboxymethylated coniferous pulp and lyocell fiber pulp. The carboxymethyl substitution degree of the carboxymethyl coniferous pulp is 0.4, the average fiber length is 2.4 mm, the beating degree is 55°SR, and the mass accounts for 30%. The average length of the lyocell fiber is 5 mm, the average width is 10 μm, and the beating degree of the lyocell fiber pulp is 8°SR, and the mass accounts for 70%. After the two pulps are mixed, basil shreds are added and mixed evenly to obtain a mixed pulp. The fineness of the basil shreds is 80 mesh, and the amount of basil shreds added accounts for 0.5% of the absolute dry fiber mass of the mixed pulp. Polyamide epichlorohydrin resin wet strength agent is added to the mixed pulp to obtain a sizing pulp, and the mass of the polyamide epichlorohydrin resin wet strength agent accounts for 0.2% of the absolute dry fiber mass of the sizing pulp. The sizing pulp is dehydrated, pressed and dried to obtain a filling paper base paper.

[0072] The base paper of the filling paper is impregnated with food-grade basil essence. After impregnation, the excess impregnation liquid is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. The drying temperature is 80℃. The amount of basil essence applied to the absolutely dry filling paper is 1.7g / m 2 .

[0073] After testing, the weight of the filling paper is 42.0g / m 2 , tightness is 0.304g / cm 3 , tensile strength is 3.86N, tensile energy absorption is 3.64J / m 2 The air permeability is 12148CU, the softness value is 783mN, and the sensory evaluation score is 3.8 points higher than that of the control group.

[0074] Example 3

[0075] The fiber raw materials are carboxymethylated bamboo pulp and lyocell fiber pulp. The carboxymethyl substitution degree of the carboxymethyl bamboo pulp is 0.2, the average fiber length is 1.5 mm, the beating degree is 35°SR, and the mass accounts for 20%. The average length of the lyocell fiber is 4 mm, the average width is 15 μm, and the beating degree of the lyocell fiber pulp is 14°SR, and the mass accounts for 80%. After the two pulps are mixed, basil shreds are added and mixed evenly to obtain a mixed pulp. The fineness of the basil shreds is 120 mesh, and the amount of basil shreds added accounts for 1.0% of the absolute dry fiber mass of the mixed pulp. Polyamide epichlorohydrin resin wet strength agent is added to the mixed pulp to obtain a sizing pulp, and the mass of the polyamide epichlorohydrin resin wet strength agent accounts for 0.3% of the absolute dry fiber mass of the sizing pulp. The sizing pulp is dehydrated, pressed and dried to obtain a filling paper base paper.

[0076] The base paper of the filling paper is impregnated with food-grade basil essence. After impregnation, the excess impregnation liquid is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. The drying temperature is 80℃. The amount of basil essence applied to the absolutely dry filling paper is 1.5g / m 2 .

[0077] After testing, the weight of the filling paper is 34.8g / m 2 , tightness is 0.289g / cm 3 , tensile strength is 3.12N, tensile energy absorption is 3.08J / m 2 The air permeability is 9107CU, the softness value is 646mN, and the sensory evaluation score is 1.9 points higher than that of the control group.

[0078] Example 4

[0079] The fiber raw materials are carboxymethyl Manila pulp and lyocell fiber pulp. The carboxymethyl substitution degree of the carboxymethyl Manila pulp is 0.4, the average fiber length is 2.4 mm, the beating degree is 25°SR, and the mass proportion is 45%. The average length of the lyocell fiber is 4 mm, the average width is 10 μm, and the beating degree of the lyocell fiber pulp is 8°SR, and the mass proportion is 55%. After the two pulps are mixed, basil shreds are added and mixed evenly to obtain a mixed pulp. The fineness of the basil shreds is 120 mesh, and the amount of basil shreds added accounts for 0.8% of the absolute dry fiber mass of the mixed pulp. A polyamide epichlorohydrin resin wet strength agent is added to the mixed pulp to obtain a sizing pulp, and the mass of the polyamide epichlorohydrin resin wet strength agent accounts for 0.3% of the absolute dry fiber mass of the sizing pulp. The sizing pulp is dehydrated, pressed and dried to obtain a filling paper base paper.

[0080] The base paper of the filling paper is impregnated with food-grade basil essence. After impregnation, the excess impregnation liquid is squeezed out by roller pressing, and the filling paper is made by drying in a drying cylinder. The drying temperature is 75℃. The amount of basil essence applied to the absolutely dry filling paper is 1.5g / m 2 .

[0081] After testing, the weight of the filling paper is 35.4g / m 2 , tightness is 0.0.342g / cm 3 , tensile strength is 6.26N, tensile energy absorption is 5.07J / m 2 The air permeability is 7897 CU, the softness value is 1328mN, and the sensory evaluation score is 0.8 points higher than that of the control group.

[0082] The control group is a conventional commercially available pure wood pulp filling paper preparation process, without adding basil shredded leaves and basil essence. Comparison between the control group and Examples 1 to 4 shows that adding basil shredded leaves or basil essence can effectively improve the sensory quality.

[0083] Comparative Example Compared with Example 2, the carboxymethyl coniferous pulp in the fiber raw material in the comparative example is replaced with ordinary virgin coniferous pulp, and other conditions remain unchanged. It can be reflected that carboxymethyl fiber can improve strength, but the softness is not greatly reduced. The synergistic use of carboxymethyl modified fiber pulp and regenerated cellulose fiber pulp can balance strength and softness, and is beneficial to improving the sensory quality of cigarettes.

[0084] In this case, carboxymethyl modified fiber pulp, regenerated cellulose fiber pulp, basil shreds, wet strength agent and basil essence are used to make filling paper. The case "A method for preparing forming paper for cigarette filter rods" submitted by the applicant on the same day uses diatomaceous earth and attapulgite to make fillers, and then uses fillers, fiber raw materials, reinforcing agents, retention agents and strengthening agents to make forming paper. The technical problems to be solved in this case are different, the technical solutions used are different, the technical effects achieved are also different, and the content and scope to be protected are also different.

[0085] It can be seen from the above embodiments that the method for preparing filter rod filling paper provided by the present invention achieves at least the following beneficial effects:

[0086] The preparation method of filter rod filling paper provided by the present invention comprises the following steps: mixing carboxymethyl modified fiber slurry and regenerated cellulose fiber slurry to obtain a first mixed slurry; adding chopped basil leaves to the first mixed slurry to obtain a second mixed slurry; adding a wet strength agent to the second mixed slurry to obtain a sizing slurry; subjecting the sizing slurry to dehydration treatment, pressing treatment and drying treatment in sequence to obtain a filling paper base paper; and impregnating the filling paper base paper with food-grade basil essence and subjecting the same to rolling treatment and drying treatment in sequence to obtain the filling paper. The carboxymethyl modified fiber slurry contains carboxymethyl fiber, which is partially dissolved and the other part is not dissolved and remains in fibrous form; the regenerated cellulose fiber slurry contains regenerated cellulose fiber, and the undissolved carboxymethyl fiber and the regenerated cellulose fiber are physically interwoven and entangled to form a fiber skeleton structure of the filling paper; since the carboxymethyl fiber is rich in carboxyl groups and hydroxyl groups, hydrogen bonds are formed between the fibers to increase the strength of the fiber skeleton; the dissolved carboxymethyl fiber bonds the chopped basil leaves with the regenerated cellulose fibers to further increase the strength of the fiber skeleton; and the regenerated cellulose fibers are bonded to each other. The binding force is weak, which can give the prepared filling paper a soft characteristic. The soft filling paper filled in the filter rod has a relatively uniform pore size, and the interception and penetration of smoke are moderate and uniform, which is helpful for the sensory evaluation of cigarette products; because the basil leaves and food-grade basil essence themselves have aroma, when the smoke flows through the filling paper, the basil aroma is emitted, which can enrich the aroma of the smoke, reduce the woody smell of the filling paper, and improve the sensory quality of cigarettes; carboxymethyl modified fiber pulp, regenerated cellulose fiber pulp and basil leaves are all green and easily degradable materials, and can also avoid or reduce pollution to the environment. In addition, the preparation method of the filter rod filling paper provided by the present invention has simple raw materials, convenient operation, and easy industrialization.

[0087] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for preparing filter rod filling paper, characterized in that: include: Mixing carboxymethyl modified fiber slurry and regenerated cellulose fiber slurry to obtain a first mixed slurry, wherein the mass of the carboxymethyl modified fiber slurry accounts for 10% to 60% of the mass of the first mixed slurry, and the mass of the regenerated cellulose fiber slurry accounts for 40% to 90% of the mass of the first mixed slurry; Adding chopped basil leaves to the first mixed slurry to obtain a second mixed slurry, wherein the mass of the chopped basil leaves accounts for 0.1% to 5% of the absolute dry fiber mass of the second mixed slurry; adding a wet strength agent to the second mixed slurry to obtain a sizing slurry; The sizing slurry is subjected to dehydration treatment, pressing treatment and drying treatment in sequence to obtain a filling paper base paper; The filling paper base paper is impregnated with food-grade basil essence and then subjected to rolling treatment and drying treatment in sequence to obtain the filling paper.

2. The method for preparing filter rod filling paper according to claim 1, characterized in that: The mass of the wet strength agent accounts for 0.1 to 0.5% of the absolute dry fiber mass of the sizing slurry.

3. The method for preparing filter rod filling paper according to claim 1, characterized in that: The gluing amount of the food-grade basil essence on the absolutely dry filling paper is in the range of 0.5 g / m 2 Up to 2g / m 2 .

4. The method for preparing filter rod filling paper according to claim 1, characterized in that: The degree of substitution of the carboxymethyl fiber in the carboxymethylated modified fiber slurry is in the range of 0.2 to 0.

5.

5. The method for preparing filter rod filling paper according to claim 1, characterized in that: The carboxymethyl modified fiber pulp is any one of carboxymethyl modified coniferous wood pulp, carboxymethyl modified hemp pulp and carboxymethyl modified bamboo pulp.

6. The method for preparing filter rod filling paper according to claim 1 or 5, characterized in that: The average fiber length of the carboxymethylated modified fiber slurry is in the range of 1.2 mm to 4 mm, and the beating degree of the carboxymethylated modified fiber slurry is in the range of 20°SR to 80°SR.

7. The method for preparing filter rod filling paper according to claim 1, characterized in that: The regenerated cellulose fiber pulp is at least one of lyocell fiber pulp and viscose fiber pulp.

8. The method for preparing filter rod filling paper according to claim 7, characterized in that: The average fiber length of the regenerated cellulose fiber pulp ranges from 3 mm to 10 mm, the average fiber width of the regenerated cellulose fiber pulp ranges from 10 μm to 30 μm, the beating degree of the lyocell fiber pulp ranges from 8°SR to 25°SR, and the beating degree of the viscose fiber pulp is 8°SR.

9. The method for preparing filter rod filling paper according to claim 1, characterized in that: The drying temperature during the drying process ranges from 60°C to 80°C.

10. The method for preparing filter rod filling paper according to claim 1, characterized in that: The basil shredded leaves have a shredded leaf mesh number range of 40 meshes to 200 meshes.

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