Preparation method and application of a lung-clearing and throat-soothing plant composite filter rod
By preparing a lung-clearing and throat-soothing plant composite filter rod through low-temperature ultrafine pulverization and sodium alginate cross-linking reaction, the problem of high cost and resource dependence on wood in cigarette filter rods is solved, and the effects of reducing the filtration of irritating substances and improving the smoking experience are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA TOBACCO HENAN IND CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-26
AI Technical Summary
Existing cigarette filter flavoring technologies are costly, have a large gap with natural flavors, and rely heavily on wood as their main raw material, cellulose acetate, which puts significant pressure on resources and the environment.
A three-dimensional mesh filter rod skeleton was constructed by cross-linking herbal plant powder with sodium alginate and calcium chloride using low-temperature ultrafine pulverization technology. Combined with low-temperature freeze-drying technology, a lung-clearing and throat-soothing herbal composite filter rod was prepared to replace the traditional cellulose acetate filter rod.
It significantly reduces throat burning and oral discomfort, enhances smoking pleasure, reduces tar and CO emissions, meets environmental standards, and promotes the low-carbon transformation of the filter rod industry.
Smart Images
Figure SMS_1 
Figure SMS_2 
Figure SMS_3
Abstract
Description
Technical Field
[0001] This invention relates to the field of cigarette flavoring material preparation and application technology, and in particular to a method for preparing and applying a lung-clearing and throat-soothing plant composite filter rod. Background Technology
[0002] In recent years, with increasing public awareness of smoking and health issues, the safety of cigarette use has become a topic of common concern. Cigarette filters are a major auxiliary material in cigarettes, and they have a certain effect in reducing tar and harm, lowering the content of particulate matter in smoke, and improving the comfort of smoking. Adding flavoring particles to cigarette filters can enhance the aroma of cigarettes, and this method has advantages such as good flavor controllability, no thermal decomposition, and high safety. However, current flavoring technologies all adopt the "carrier + flavoring" form, and the flavorings are mostly extracted and blended through cumbersome chemical processes, such as flavor capsules and gel flavoring threads. However, their realism and natural taste are significantly different, and the cost is generally high, which does not conform to the tobacco industry's policy orientation of "reducing harm and tar, returning to the original aroma" and the trend of cigarette consumption. Furthermore, the main raw material for making filters, cellulose acetate, mainly relies on wood. The increasing scarcity of global wood resources and growing environmental awareness make the task of finding alternatives to cellulose acetate and reducing dependence on wood resources urgent. This will not only help alleviate the shortage of timber resources, but also promote the sustainable development of the filter rod industry. Therefore, researching and developing low-cost, eco-friendly new flavor-enhancing cigarette filter rod technologies is imperative and cannot be delayed.
[0003] Based on this, the present invention breaks through the technical bottleneck of traditional cigarette filters by adding herbal plant powder with throat-soothing and throat-clearing effects to the filter matrix, giving the cigarette smoke a unique refreshing taste and a lasting sweet aftertaste. At the same time, it can effectively neutralize the irritating substances in the smoke, significantly reduce the burning sensation in the throat and the discomfort of residual taste in the mouth, and release a light plant aroma, forming a harmonious and integrated taste layer with the tobacco flavor, bringing consumers a healthier and more enjoyable smoking experience. Summary of the Invention
[0004] The technical problem to be solved by this invention is to provide a method for preparing and applying a lung-clearing and throat-soothing plant composite filter rod. This invention addresses the problems of high cost, large gap between the existing cigarette filter rod aroma enhancement technology and the fact that the main raw material, cellulose acetate, is dependent on wood, resulting in significant resource and environmental pressures. The invention provides a low-cost, natural method for preparing a lung-clearing and throat-soothing plant composite filter rod that can reduce harm and tar and improve the smoking experience.
[0005] The technical problem to be solved by the present invention is achieved through the following technical solution:
[0006] A method for preparing a lung-clearing and throat-soothing herbal composite filter rod includes the following steps:
[0007] (1) Screening of natural plants: Two groups of natural plants were selected. The first group consisted of Sophora tonkinensis, honeysuckle, Poria cocos, Magnolia officinalis and licorice. The second group consisted of Rabdosia rubescens, honeysuckle, Sophora tonkinensis, Oroxylum indicum, Belamcanda chinensis, Platycodon grandiflorus, Salvia miltiorrhiza and licorice.
[0008] (2) Preparation of natural plant ultrafine powder: Select any group of natural plants in step (1) and air dry them naturally. Mix them according to the formula ratio and pulverize them to a particle size of less than 10μm using a low temperature ultrafine pulverizer to obtain natural plant ultrafine powder.
[0009] (3) Preparation of sodium alginate aqueous solution: Weigh sodium alginate into a beaker, add deionized water, stir until completely dissolved, and obtain sodium alginate aqueous solution with a mass concentration of 30-50 g / L;
[0010] (4) Preparation of calcium chloride ethanol solution: Weigh anhydrous calcium chloride into a beaker, add ethanol, and stir until completely dissolved to obtain a calcium chloride ethanol solution with a mass concentration of 30-50 g / L;
[0011] (5) Preparation of composite filter rods:
[0012] Add the natural plant ultrafine powder from step (2) to the sodium alginate aqueous solution from step (3), place it in an ice bath, and then treat it with high-frequency ultrasound to make it evenly dispersed, thus obtaining natural plant micro powder@SA solution.
[0013] Freeze-forming: The solution is injected into a cylindrical mold and pre-frozen in a freeze dryer at -25 to -10°C for 1 to 2 hours to form an ice solid. After being placed at room temperature, the mold is removed. Then, the vacuum is adjusted to 60 to 80 Pa, and sublimation drying is carried out at 30 to 45°C for 12 to 16 hours. Finally, desorption drying is carried out at 45 to 60°C for 6 to 11 hours. After freezing in liquid nitrogen, an ice solid is obtained, the glass template is removed, and the filter rod is freeze-dried for 24 hours to obtain the initial product.
[0014] Immerse the filter rod sample in the calcium chloride ethanol solution of step (4) for 6-12 hours, and wash the base rod with ethanol multiple times until no Ca²⁺ residue can be detected.
[0015] Vacuum drying at 40℃ for 12-24 hours yields a base rod containing plant micropowder;
[0016] The base rod is cut to the target length, spliced with cellulose acetate segments in proportion, rolled up, and wrapped with filter rod paper to prepare a composite filter rod.
[0017] Preferably, in the above technical solution, the first group of natural plants consists of the following components by weight: 6 parts of Sophora tonkinensis root, 12 parts of honeysuckle flower, 15 parts of Poria cocos, 9 parts of Magnolia officinalis bark, and 6 parts of licorice root.
[0018] Preferably, in the above technical solution, the second group of natural plants consists of the following components by weight: 15 parts of *Isodon japonicus*, 12 parts of honeysuckle, 6 parts of *Sophora tonkinensis*, 9 parts of *Oroxylum indicum*, 9 parts of *Belamcanda chinensis*, 9 parts of *Platycodon grandiflorus*, 12 parts of *Salvia miltiorrhiza*, and 6 parts of
[0019] Preferably, in the above technical solution, the mass concentration of the sodium alginate aqueous solution is 50 g / L, and the mass concentration of the calcium chloride ethanol solution is 50 g / L.
[0020] Preferably, in the above technical solution, during the preparation of the composite matrix rod containing natural plant micropowder, the frequency of the high-frequency ultrasonic treatment is 20 kHz, and the treatment time is 5-20 min.
[0021] Preferably, in the above technical solution, in step (5), the mass ratio of plant micropowder:alginic acid:anhydrous calcium chloride is (0.66-2):1:1, and the mass percentage of plant micropowder in the base rod is 10-50%.
[0022] Preferably, in the above technical solution, in step (5), the inner diameter of the cylindrical glass mold is 24.1 mm.
[0023] A lung-clearing and throat-soothing plant composite filter rod prepared by the above preparation method.
[0024] The application of a lung-clearing and throat-soothing plant composite filter rod in cigarette manufacturing. When the composite filter rod is used in cigarettes, it can reduce the tar release and CO release of cigarettes and improve tobacco quality.
[0025] A cigarette containing a compound filter rod made from herbs that clear the lungs and soothe the throat.
[0026] The above-described technical solution of the present invention has the following beneficial effects:
[0027] (1) By targeting and neutralizing the irritating components in the smoke through nano-level herbal micro-powder, it effectively relieves the burning and discomfort in the throat of smokers, while bringing a refreshing taste and a lasting sweet aftertaste, significantly improving the pleasure of smoking, which meets the health consumption demands of contemporary consumers for "low stimulation and high pleasure".
[0028] (2) Using the controlled cross-linking reaction of sodium alginate and calcium ions to construct a three-dimensional mesh filter rod skeleton to replace traditional cellulose acetate can not only significantly reduce the dependence on wood resources and promote the low-carbon transformation of the filter rod industry, but also the environmentally friendly bio-based material meets the latest domestic environmental protection standards and helps the tobacco industry achieve the goal of "carbon neutrality".
[0029] (3) The honeycomb porous structure formed by the low-temperature freeze-drying process can not only improve the filtration efficiency, but also retain the active ingredients in natural plants, achieving a dual improvement in taste quality and health attributes, and meeting consumers' complex needs for "reducing harm and increasing aroma". Detailed Implementation
[0030] Various exemplary embodiments of the present invention will now be described in detail. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the invention.
[0031] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available. Unless otherwise specified, the equipment used in the experiments is well known to those skilled in the art.
[0032] A method for preparing a lung-clearing and throat-soothing herbal composite filter rod includes the following steps:
[0033] 1. Selection of natural plants
[0034] By using modern information technology, combining TCM clinical data with big data to explore patterns, and combining the Chinese Pharmacopoeia and TCM compatibility theory, two groups of natural plants were selected.
[0035] Group 1: 6g of Sophora tonkinensis root, 12g of Lonicera japonica flower, 15g of Poria cocos, 9g of Magnolia officinalis bark, and 6g of Glycyrrhiza uralensis root.
[0036] Group 2: 15g of *Isodon japonicus*, 12g of honeysuckle, 6g of *Sophora tonkinensis*, 9g of *Oroxylum indicum*, 9g of *Belamcanda chinensis*, 9g of *Platycodon grandiflorus*, 12g of *Salvia miltiorrhiza*, and 6g of licorice.
[0037] 2. Preparation of natural plant powders
[0038] After the selected natural plants are naturally air-dried, they are mixed according to the formula ratio and then pulverized to a particle size of less than 10μm using a low-temperature ultrafine pulverizer to obtain natural plant ultrafine powder.
[0039] 3. Preparation of sodium alginate aqueous solution (SA)
[0040] Weigh a certain amount of sodium alginate into a beaker, add a certain amount of deionized water, and stir until the sodium alginate is completely dissolved. The mass concentration of sodium alginate is 30~50g / L.
[0041] 4. Preparation of calcium chloride ethanol solution
[0042] Weigh a certain amount of calcium chloride into a beaker, add a certain amount of ethanol, and stir until the calcium chloride is completely dissolved. The mass concentration of calcium chloride is 30~50g / L.
[0043] 5. Preparation of composite rods containing natural plant micro-powder
[0044] Natural plant microparticles were added to a sodium alginate aqueous solution, and then the beaker was placed in an ice bath and treated with high-frequency ultrasound (20 kHz) to promote uniform dispersion of the natural plant microparticles. The resulting natural plant microparticle @SA solution was then added to a cylindrical glass mold. After freezing in liquid nitrogen, an ice solid conforming to the shape of the mold was obtained. This solid was then left in air for a period of time and the glass template was peeled off. After 24 hours of freeze-drying, filter rod bases for cigarettes of different specifications were prepared, with the plant microparticles comprising 10-50% by mass.
[0045] The base rod was immersed in an ethanol solution containing calcium chloride (CaCl2) at a concentration of 30-40 g / L for 6-12 hours. The base rod was then washed repeatedly with ethanol until no calcium ions (Ca²⁺) residue was detected. Finally, it was vacuum dried at 40°C for 12-24 hours.
[0046] 6. Preparation of filter rods
[0047] Filter rod samples were prepared on the same machine, and blank cellulose acetate filter rod samples were prepared as a control.
[0048] Based on a certain specification of cigarette, a sample of that specification of cigarette is rolled on the same machine using the aforementioned filter rod.
[0049] Example 1
[0050] The following natural plant ingredients, after being dried in the shade, were weighed out: 60g of Sophora tonkinensis root, 120g of honeysuckle flower, 150g of Poria cocos, 90g of Magnolia officinalis bark, and 60g of licorice root. They were then pulverized using a low-temperature ultrafine pulverizer to a particle size of less than 10μm to obtain an ultrafine powder of the natural plant formula.
[0051] Weigh 50g of sodium alginate into a beaker, add 1000mL of deionized water, and stir until the sodium alginate is completely dissolved. The mass concentration of sodium alginate is 50g / L.
[0052] Weigh 50g of anhydrous calcium chloride into a beaker, add a certain amount of ethanol, and stir until the calcium chloride is completely dissolved. The mass concentration of calcium chloride is 50g / L.
[0053] 100g of natural plant micropowder was weighed and added in batches to a sodium alginate aqueous solution under stirring. The beaker was then placed in an ice bath and treated with high-frequency ultrasound (20 kHz) to promote uniform dispersion of the natural plant micropowder particles. The resulting natural plant micropowder@SA solution was then added in batches to a cylindrical glass mold with an inner diameter of 24.1 mm. After freezing in liquid nitrogen, an ice solid conforming to the shape of the mold was obtained. This solid was then left in air for a period of time, and the glass template was peeled off. After 24 hours of freeze-drying, filter rods for different cigarette sizes were prepared. The filter rods were then immersed in an ethanol solution containing calcium chloride for 6-12 hours, followed by repeated washing with ethanol until no calcium ions (Ca²⁺) residue was detected. Finally, the rods were vacuum-dried at 40°C for 12-24 hours to obtain a base rod containing plant micropowder, with the plant micropowder comprising approximately 50% by mass.
[0054] Based on a conventional cigarette (cigarette length 84 mm, circumference 24.3 mm, filter length 25.0 mm), composite filter rod samples were prepared with a filter rod structure of 15 (cellulose acetate segment) mm + 10 (micro powder filter rod segment) mm, and cigarette sample A of the same specification was rolled using the above filter rod.
[0055] Example 2
[0056] The following natural plant ingredients, after being dried in the shade, were weighed out: 60g of Sophora tonkinensis root, 120g of honeysuckle flower, 150g of Poria cocos, 90g of Magnolia officinalis bark, and 60g of licorice root. They were then pulverized using an ultra-low temperature micro-pulverizer to a particle size of less than 10μm to obtain an ultrafine powder of the natural plant formula.
[0057] Weigh 50g of sodium alginate into a beaker, add 1000mL of deionized water, and stir until the sodium alginate is completely dissolved. The mass concentration of sodium alginate is 50g / L.
[0058] Weigh 50g of anhydrous calcium chloride into a beaker, add a certain amount of ethanol, and stir until the calcium chloride is completely dissolved. The mass concentration of calcium chloride is 50g / L.
[0059] 33g of natural plant micropowder was weighed and added in batches to a sodium alginate aqueous solution under stirring. The beaker was then placed in an ice bath and treated with high-frequency ultrasound (20 kHz) to promote uniform dispersion of the natural plant micropowder particles. The resulting natural plant micropowder@SA solution was then added in batches to a cylindrical glass mold with an inner diameter of 24.1 mm. After freezing in liquid nitrogen, an ice solid conforming to the shape of the mold was obtained. This solid was then left in air for a period of time, and the glass template was peeled off. After 24 hours of freeze-drying, filter rods for different cigarette sizes were prepared. The filter rods were then immersed in an ethanol solution containing calcium chloride for 6-12 hours, followed by repeated washing with ethanol until no calcium ions (Ca²⁺) residue was detected. Finally, the rods were vacuum-dried at 40°C for 12-24 hours to obtain a base rod containing plant micropowder, with the plant micropowder comprising approximately 25% of the total mass.
[0060] Based on a conventional cigarette (cigarette length 84 mm, circumference 24.3 mm, filter length 25.0 mm), composite filter rod samples were prepared with a filter rod structure of 15 (acetic acid fiber segment) mm + 10 (micro powder filter rod segment) mm, and cigarette sample B of the same specification was rolled using the above filter rod.
[0061] Example 3
[0062] The following natural plants, after being dried in the shade, were weighed out: 150g of *Isodon japonicus*, 120g of honeysuckle, 60g of *Sophora tonkinensis*, 90g of *Oroxylum indicum*, 90g of *Belamcanda chinensis*, 90g of *Platycodon grandiflorus*, 120g of *Salvia miltiorrhiza*, and 60g of licorice. They were then pulverized using a low-temperature ultrafine pulverizer to a particle size of less than 10μm to obtain an ultrafine powder of the natural plant formula.
[0063] Weigh 50g of sodium alginate into a beaker, add 1000mL of deionized water, and stir until the sodium alginate is completely dissolved. The mass concentration of sodium alginate is 50g / L.
[0064] Weigh 50g of anhydrous calcium chloride into a beaker, add a certain amount of ethanol, and stir until the calcium chloride is completely dissolved. The mass concentration of calcium chloride is 50g / L.
[0065] 100g of natural plant micropowder was weighed and added in batches to a sodium alginate aqueous solution under stirring. The beaker was then placed in an ice bath and treated with high-frequency ultrasound (20 kHz) to promote uniform dispersion of the natural plant micropowder particles. The resulting natural plant micropowder@SA solution was then added in batches to a cylindrical glass mold with an inner diameter of 24.1 mm. After freezing in liquid nitrogen, an ice solid conforming to the shape of the mold was obtained. This solid was then left in air for a period of time, and the glass mold was peeled off. After 24 hours of freeze-drying, a preliminary filter rod for use in cigarettes of different specifications was prepared. The preliminary filter rod was then immersed in an ethanol solution containing calcium chloride for 6-12 hours, followed by repeated washing with ethanol until no calcium ions (Ca²⁺) residue was detected. Finally, it was vacuum dried at 40°C for 12-24 hours to obtain a base rod containing plant micropowder, with the plant micropowder comprising approximately 50% by mass.
[0066] Based on a conventional cigarette (cigarette length 84 mm, circumference 24.3 mm, filter length 25.0 mm), composite filter rod samples were prepared with a filter rod structure of 15 (acetic acid fiber segment) mm + 10 (micro powder filter rod segment) mm, and cigarette sample C of the same specification was rolled using the above filter rod.
[0067] Example 4
[0068] The following natural plants, after being dried in the shade, were weighed out: 150g of *Isodon japonicus*, 120g of honeysuckle, 60g of *Sophora tonkinensis*, 90g of *Oroxylum indicum*, 90g of *Belamcanda chinensis*, 90g of *Platycodon grandiflorus*, 120g of *Salvia miltiorrhiza*, and 60g of licorice. They were then pulverized using a low-temperature ultrafine pulverizer to a particle size of less than 10μm to obtain an ultrafine powder of the natural plant formula.
[0069] Weigh 50g of sodium alginate into a beaker, add 1000mL of deionized water, and stir until the sodium alginate is completely dissolved. The mass concentration of sodium alginate is 50g / L.
[0070] Weigh 50g of anhydrous calcium chloride into a beaker, add a certain amount of ethanol, and stir until the calcium chloride is completely dissolved. The mass concentration of calcium chloride is 50g / L.
[0071] 33g of natural plant micropowder was weighed and added in batches to a sodium alginate aqueous solution under stirring. The beaker was then placed in an ice bath and treated with high-frequency ultrasound (20 kHz) to promote uniform dispersion of the natural plant micropowder particles. The resulting natural plant micropowder@SA solution was then added in batches to a cylindrical glass mold with an inner diameter of 24.1 mm. After freezing in liquid nitrogen, an ice solid conforming to the shape of the mold was obtained. This solid was then left in air for a period of time, and the glass template was peeled off. After 24 hours of freeze-drying, filter rods for different cigarette sizes were prepared. The filter rods were then immersed in an ethanol solution containing calcium chloride for 6-12 hours, followed by repeated washing with ethanol until no calcium ions (Ca²⁺) residue was detected. Finally, the rods were vacuum-dried at 40°C for 12-24 hours to obtain a base rod containing plant micropowder, with the plant micropowder comprising approximately 25% of the total mass.
[0072] Based on a conventional cigarette (cigarette length 84 mm, circumference 24.3 mm, filter length 25.0 mm), composite filter rod samples were prepared with a filter rod structure of 15 (cellulose acetate segment) mm + 10 (micro powder filter rod segment) mm, and cigarette sample D of the same specification was rolled using the above filter rod.
[0073] Application Example 1
[0074] Filter rods and finished cigarettes
[0075] The filter rod and cigarette samples were equilibrated for 48 hours at a temperature of (22±2) ℃ and a relative humidity of (60±5)%. Subsequently, the main physical properties of the filter rod were tested according to industry standards, and the test results are shown in Table 1.
[0076] Table 1. Test results of main physical properties of filter rods
[0077]
[0078] As shown in Table 1, the filter rods prepared by this invention have no significant difference in physical properties compared with those produced by normal means.
[0079] To ensure the consistency of tobacco content in the tested cigarette samples, the balanced cigarette samples were screened as smoke test samples according to the following conditions: pressure drop (design value ± 100) Pa, mass (design value ± 0.02) g, and filter ventilation rate (design value ± 2)%. The test results are shown in Table 2.
[0080] Table 2. Test results of physical and smoke indicators of finished cigarettes
[0081]
[0082] As shown in Table 2, compared with the blank control, the composite filter rods with added natural plant powder can reduce the release of tar and CO. Within the range of added amounts, the tar release can be reduced from 11.1 mg / cig to 9.4 mg / cig, with a reduction rate of 12.6% to 16.2%, and the CO release can be reduced from 11.5 mg / cig to 9.3 mg / cig, with a reduction rate of 13.9% to 19.1%. This may be because during the freeze-drying process, the moisture in the composite filter rod particles directly sublimates, resulting in a large number of micron-sized pores inside the filter rod, which significantly increases the specific surface area. This structure not only prolongs the residence time of tar molecules in the pores, but also improves the CO capture efficiency through the "cage effect". In addition, the functional groups such as carboxyl (-COOH) and hydroxyl (-OH) in the ultrafine plant powder are exposed on the surface. These groups can form hydrogen bonds with polar molecules (such as phenols) in tar, which further promotes the reduction of harmful components such as tar and indirectly achieves the effect of reducing harm and tar.
[0083] Sensory evaluation:
[0084] The sensory evaluation of the above five cigarette samples was conducted in accordance with GB / T 5606.4-2005 "Cigarettes Part 4: Sensory Technical Requirements" and YC / T 497-2014 "Sensory Evaluation Method for Chinese Style Cigarettes".
[0085] Table 3 Sensory quality evaluation results of test samples and control samples
[0086]
[0087] Data shows that, compared to cigarettes made with traditional pure cellulose acetate filters, cigarettes made with the composite filter developed in this invention achieve a positive cycle of "quality improvement and harm reduction" while maintaining stable smoke concentration. Specifically, the aroma and quantity of this cigarette are improved, smoke concentration and permeability indicators show positive growth, and the aroma layers and richness are expanded. Notably, the oral cleanliness during smoking is significantly improved, the mouth feels sweet and moist, and the perception of irritation is effectively reduced, resulting in a more harmonious and pleasant overall smoking experience. These simultaneous improvements in sensory indicators fully verify the dual advantages of this composite filter technology in improving cigarette quality and reducing harm, demonstrating broad application prospects and market value.
[0088] This invention first uses low-temperature ultrafine pulverization technology to produce herbal essences into nano-sized powders. Then, it utilizes the controlled cross-linking reaction of sodium alginate and calcium ions to construct a three-dimensional mesh filter rod skeleton, replacing traditional cellulose acetate. Subsequently, low-temperature freeze-drying technology not only completely preserves the active plant ingredients but also forms a honeycomb porous structure. This effectively filters out irritating substances in cigarette smoke, significantly reducing throat burning and oral discomfort. It also slowly releases refreshing components, giving cigarette smoke a unique refreshing taste and a lasting sweet aftertaste, creating a harmonious flavor profile with the natural tobacco flavor. At the same time, the filter rod can significantly reduce the release of tar (reduction rate 16.5%) and CO (reduction rate 19.1%) from cigarettes, providing consumers with a healthier and more enjoyable smoking experience, and showing promising application prospects.
[0089] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various different choices and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention is defined by the claims and their equivalents.
Claims
1. A method for preparing a lung-clearing and throat-soothing plant composite filter rod, characterized in that, Includes the following steps: (1) Screening of natural plants: Two groups of natural plants were selected. The first group consisted of Sophora tonkinensis, honeysuckle, Poria cocos, Magnolia officinalis and licorice. The second group consisted of Rabdosia rubescens, honeysuckle, Sophora tonkinensis, Oroxylum indicum, Belamcanda chinensis, Platycodon grandiflorus, Salvia miltiorrhiza and licorice. (2) Preparation of natural plant ultrafine powder: Select any group of natural plants in step (1) and air dry them naturally. Mix them according to the formula ratio and pulverize them to a particle size of less than 10μm using a low temperature ultrafine pulverizer to obtain natural plant ultrafine powder. (3) Preparation of sodium alginate aqueous solution: Weigh sodium alginate into a beaker, add deionized water, stir until completely dissolved, and obtain sodium alginate aqueous solution with a mass concentration of 30-50 g / L. (4) Preparation of calcium chloride ethanol solution: Weigh anhydrous calcium chloride into a beaker, add ethanol, and stir until completely dissolved to obtain a calcium chloride ethanol solution with a mass concentration of 30-50 g / L. (5) Preparation of composite filter rods: Add the natural plant ultrafine powder from step (2) to the sodium alginate aqueous solution from step (3), place it in an ice bath, and then treat it with high-frequency ultrasound to make it uniformly dispersed, thus obtaining natural plant micro powder@SA solution. Freeze-forming: The solution is injected into a cylindrical mold and pre-frozen in a freeze dryer at a temperature range of -25 to -10°C for 1 to 2 hours to form an ice solid. After being placed at room temperature, the mold is removed. Then, the vacuum degree is adjusted to 60 to 80 Pa, and sublimation drying is carried out at 30 to 45°C for 12 to 16 hours. Finally, desorption drying is carried out at a temperature range of 45 to 60°C for 6 to 11 hours. After freezing in liquid nitrogen, an ice solid is obtained. The glass template is removed, and the filter rod is freeze-dried for 24 hours to obtain the initial product. The filter rod primatives are immersed in the calcium chloride ethanol solution of step (4) for 6-12 hours and the base rod is washed with ethanol several times until no Ca2+ + residue; Vacuum drying at 40℃ for 12-24 hours yields a base rod containing plant micropowder; The base rod is cut to the target length, spliced with cellulose acetate segments in proportion, rolled up, and wrapped with filter rod paper to prepare a composite filter rod.
2. The production method according to claim 1, characterized by, The first group of natural plants consists of the following components by weight: 6 parts of Sophora tonkinensis root, 12 parts of honeysuckle flower, 15 parts of Poria cocos, 9 parts of Magnolia officinalis bark, and 6 parts of licorice root.
3. The preparation method according to claim 1, characterized in that, The second group of natural plants consists of the following components by weight: 15 parts of *Isodon japonicus*, 12 parts of honeysuckle, 6 parts of *Sophora tonkinensis*, 9 parts of *Oroxylum indicum*, 9 parts of *Belamcanda chinensis*, 9 parts of *Platycodon grandiflorus*, 12 parts of *Salvia miltiorrhiza*, and 6 parts of licorice.
4. The method of claim 1, wherein, The sodium alginate aqueous solution has a mass concentration of 50 g / L, and the calcium chloride ethanol solution has a mass concentration of 50 g / L.
5. The preparation method according to claim 1, characterized in that, In the preparation of composite rods containing natural plant micropowder, the frequency of the high-frequency ultrasonic treatment is 20 kHz, and the treatment time is 5-20 min.
6. The method of claim 1, wherein, In step (5), the mass ratio of plant micro powder: alginic acid and anhydrous calcium chloride is (0.66-2):1:1, and the mass percentage of plant micro powder in the base rod is 10-50%.
7. The preparation method according to claim 1, characterized in that, In step (5), the inner diameter of the cylindrical glass mold is 24.1 mm.
8. A lung-clearing and throat-soothing plant composite filter rod prepared by the preparation method according to any one of claims 1-7.
9. The use of the lung-clearing and throat-soothing plant composite filter rod according to claim 8 in the preparation of cigarettes, characterized in that, When the composite filter rod is used in cigarettes, it can reduce the release of tar and CO, thereby improving the quality of tobacco.
10. A cigarette, characterized by It includes the lung-clearing and throat-soothing herbal composite filter rod as described in claim 8.