Method for preparing paper filter tip based on air-cured tobacco waste and application

Abstract

The invention provides a method for preparing a paper filter tip based on air-cured tobacco waste, which comprises the following steps: (1) carrying out hot water ultrasonic extraction by using air-cured tobacco waste stem bark, and then carrying out solid-liquid separation; (2) pulping the solid part, and preparing a substrate by adopting a method for preparing reconstituted tobacco by a papermaking method; (3) concentrating the liquid part to obtain a bark paste, and preparing a coating liquid; (4) spraying a coating liquid on the substrate; (5) cutting the sprayed substrate into long filaments, gathering the long filaments into a roll, and wrapping the roll with filter stick forming paper; and cutting to a required length to obtain the paper filter rod. The invention further discloses application of the prepared paper filter tip to a composite filter tip.

Description

Technical Field

[0001] The present invention belongs to the technical field of tobacco, and in particular relates to a method for preparing a paper mouthpiece stick using air-dried tobacco waste; at the same time, the present invention also relates to the specific application of the paper mouthpiece stick in cigarette production. Background Art

[0002] Cigarette filter rods play a crucial role in improving cigarette quality and flavor, reducing tar and harm. Currently, most filter rods on the market are made from acetate tow, with a smaller number made from polypropylene fibers. The molding technology and theoretical research behind these filter rods are relatively mature, and all are capable of effectively intercepting and filtering harmful components from cigarette smoke.

[0003] Compared to acetate and polypropylene filter rods, paper filter tips are highly biodegradable and cost-effective. At the same filtration pressure drop, they offer greater efficiency in retaining tar and harmful components in smoke. Reconstituted tobacco filter tip rods can also incorporate suitable particulate aroma carriers into the base material, or be coated with flavors and fragrances to improve smoke characteristics and draw quality. Among various paper tip rods, reconstituted tobacco tip rods integrate papermaking, reconstituted tobacco forming, coating, and fragrance spraying processes. They offer advantages such as low cost, environmental friendliness, simple production processes, and excellent tar and harm reduction. They can also be used to impart unique character to cigarettes in a variety of ways. These tips imbue cigarettes with a richer tobacco flavor, further enhancing the distinctive characteristics of smoke within smoke, flavor within flavor, and aroma within flavor. Furthermore, while meeting personalized cigarette needs, they also provide new approaches for improving the utilization of tobacco raw materials and waste resources.

[0004] However, the sheet base of conventional reconstituted tobacco leaf mouthpieces is made from tobacco pulp and stem pulp as the main materials. Since the fibers in the pulp are short and have low strength and a high content of fine components, the sheet base strength obtained is poor, and powder and hair loss are serious. The strength and toughness of tobacco stem skin are much higher than those of tobacco leaves and tobacco stems, which can effectively solve the problem of poor sheet strength of conventional reconstituted tobacco leaves. The present invention can also make high-value-added use of tobacco stem waste, effectively improving the comprehensive utilization efficiency of tobacco planting waste.

[0005] The present invention is proposed for this purpose. Summary of the Invention

[0006] The present invention aims to address the shortcomings of existing technologies by providing a method for preparing paper tip rods from sun-dried tobacco stem bark, a waste product of sun-dried tobacco. The paper tip rods, made entirely of plant fibers, not only address the problem of recycling and reusing sun-dried tobacco waste but also meet the adaptability of paper filter rod forming equipment, thereby resolving technical issues such as the poor strength of the base sheet of conventional reconstituted tobacco leaf paper tip rods. The present invention also aims to provide specific applications of the paper tip rods in cigarette production.

[0007] Unless otherwise specified, all percentages used in the present invention are by weight.

[0008] The purpose of the present invention is achieved through the following technical solutions.

[0009] The first aspect of the present invention discloses a method for preparing a paper nozzle stick, comprising the following steps:

[0010] (1) Using the stem bark peeled from the stems of sun-cured tobacco leaves after harvest, hot water ultrasonic extraction is performed, followed by solid-liquid separation; the sun-cured tobacco is the local specialty Yunnan sun-cured red tobacco;

[0011] (2) pulping the solid portion of the solid-liquid separation to obtain stem bark pulp, and using a papermaking method to prepare reconstituted tobacco leaves to obtain a base sheet;

[0012] (3) concentrating the liquid portion of the solid-liquid separation to obtain a stem bark paste, and using the stem bark paste to prepare a coating liquid;

[0013] (4) spraying the coating liquid obtained in step (3) on the substrate obtained in step (2), and then cutting it into strips;

[0014] (5) Cut the coated substrate into uniform filaments, then roll them into a roll and wrap them with filter rod forming paper, and cut them into the required length; thus, a paper nozzle rod is obtained.

[0015] Preferably, the hot water ultrasonic extraction step of step (1) comprises: rehydrating the bark of naturally dried, sun-dried tobacco leaves cut into 0.5-3.0 cm lengths to a moisture content of 13-18%, fermenting the leaves at 35-45°C for 20-30 days, and then ultrasonically extracting the leaves in hot water at 50-90°C for 40-90 minutes; the mass ratio of the leaves to the hot water being 1:(3-5). After the extraction is completed, solid-liquid separation is performed, the solid portion is used for pulping, and the liquid portion is concentrated and precipitated with alcohol to prepare a bark paste for coating.

[0016] Preferably, the solid portion of the solid-liquid separation in step (2) is 50-200 mesh, and the preparation steps of the stem bark pulp are: the solid portion of the solid-liquid separation in step (2) is 50-200 mesh; the preparation steps of the stem bark pulp are: polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, cationic starch, and the solid portion are mixed, an appropriate amount of water is added, and then the mixture is decomposed and beaten, with a beating degree of 15-50°SR to obtain the stem bark pulp; the obtained stem bark pulp is made into a base sheet by a papermaking method for reconstructing tobacco leaves, so that the base sheet thickness is 30-50g / m 2 .

[0017] Preferably, calculated by dry weight, the mass ratio of the components in the bark pulp is: polyglycerol fatty acid ester 0.2-1%, modified polylactic acid fiber 2-5%, sodium carboxymethyl cellulose 0.5-2%, cationic starch 0.5-1%, bark extracted solid matter 9-13%, and the balance is water.

[0018] In the bark pulp formula, polyglycerol fatty acid ester is a new type of highly efficient and excellent polyhydroxy ester non-ionic surfactant that can significantly improve the dispersion of bark and modified polylactic acid fibers in the pulp and enhance stability. Polylactic acid fibers are made from starch-containing agricultural products such as corn, wheat, and sugar beets. After fermentation to produce lactic acid, they are made by polycondensation and melt spinning. They have good fusion with bark pulp fibers, especially under humid conditions. They can increase the tensile strength of reconstituted tobacco leaf substrates, which is beneficial for molding and coating. Sodium carboxymethyl cellulose is a commonly used papermaking additive. Its carboxyl groups form hydrogen bonds with the hydroxyl groups on the surface of pulp fibers, significantly enhancing the bonding force between fibers and significantly improving the tensile strength, burst resistance, and flexibility of the paper. It can also prevent fiber agglomeration through colloidal stability and improve paper uniformity. It is especially suitable for the production of low-weight tissue paper. Cationic starch can use its positive charge to absorb negatively charged fine fibers, reduce fiber loss, improve raw material utilization and reduce production costs; in addition, it can prevent and control fiber flocculation in the slurry, and accelerate the pulp dehydration rate by increasing fiber bonding strength, improve paper water resistance, and increase paper machine papermaking speed and output.

[0019] Preferably, the coating liquid of step (3) is prepared by uniformly mixing the alcohol-precipitated stem bark paste, the sun-cured tobacco high-nicotine extract, biological calcium carbonate, xanthan gum, polyglycerol stearate, glycerol and ethanol solution to obtain the coating liquid.

[0020] Preferably, the mass ratio of each component in the coating liquid is: 10-20% of the stem bark paste after alcohol precipitation; 5-8% of the high-nicotine extract of sun-cured tobacco; 5-8% of biological calcium carbonate; 0.5-2.0% of xanthan gum; 0.1-5% of polyglycerol stearate; 3-5% of glycerol; the remainder is ethanol solution, which is an aqueous solution containing 30-50% ethanol (v / v); a small amount of flavors and fragrances can be added to the coating liquid as needed.

[0021] In the coating liquid formulation, alcohol-precipitated stem bark paste can be prepared using the previously extracted stem bark paste. After alcohol precipitation to remove impurities, the resulting tobacco paste is enriched with aroma components, resulting in a better flavoring effect. Furthermore, the prepared substrate is less susceptible to moisture and adhesion during the subsequent molding process. Bio-calcium carbonate significantly increases the specific surface area of ​​the substrate, thereby increasing the smoke elution area during subsequent cigarette smoking, which helps increase the release of aroma components from the paper filter plate. A high-nicotine extract from sun-cured tobacco is prepared by collecting waste from the sun-cured red tobacco air-dried and fermented process, extracting it with methyl acetate Soxhlet until the nicotine is completely dissolved, and concentrating it to obtain the sun-cured tobacco paste. Alternatively, the extract is prepared by extracting the branches that emerge from the stems of sun-cured red tobacco leaves after they have been harvested and air-dried. After drying and fermentation, the extract is then extracted with methyl acetate Soxhlet until the nicotine is completely dissolved, and concentrating it to obtain the sun-cured tobacco paste. This extract contains a large amount of nicotine and fat-soluble aroma components, effectively compensating for the aroma deficiency of stem bark paste alone in a formulation. Xanthan gum acts as a dispersant and binder, promoting the dispersion and stability of the slurry. It also ensures better bonding after spraying, preventing slagging and dusting. Polyglycerol stearate acts as a surfactant, effectively softening the fat-soluble and water-soluble components in the slurry and significantly increasing the slurry's stability, preventing stratification caused by water-fat immiscibility. Glycerin acts as a stabilizer and fixative, mitigating the loss of aroma components through volatilization.

[0022] Preferably, the spraying amount of the coating liquid in step (4) is 15-20% of the dry weight of the film base; and the film is cut into strips with a width of 8-20 cm.

[0023] Preferably, the width of the filament in step (5) is 0.6-1.0 mm; and the gathered roll is in a spiral shape with an oblique angle of 10-30 degrees.

[0024] The second aspect of the present invention discloses the use of the paper nozzle stick prepared by the preparation method for a composite nozzle stick.

[0025] Preferably, the composite tip includes a paper tip and an acetate filter. The composite tip is formed and crimped by laminating the tip on a composite tip forming machine, with the reconstituted paper tip having a length of 5-15 mm and the acetate filter having a length of 15-25 mm. The filter rods can then be cut into 25 mm or 30 mm lengths according to the needs of the cigarette product. The filter rods are then crimped onto the cigarette to produce a cigarette product with the composite tip.

[0026] The beneficial effects of the present invention are:

[0027] 1. The paper tip holder of the present invention is made from all-plant fiber, a waste product of local specialty tobacco, effectively resolving the issue of recycling tobacco stems after harvest. The raw material cost is low and the supply is abundant. Because tobacco husks have much higher strength and toughness than tobacco leaves and stems, they effectively address the poor sheet strength of conventional reconstituted tobacco. The resulting sheet has high strength, strong water resistance, high raw material utilization, low production cost, and high papermaking speed and output.

[0028] 2. The manufacturing method of the paper nozzle rod of the present invention is simple and the production process is easy to implement; in the process, both the pulp and the extract can be fully utilized, so that the tobacco stem waste can be utilized with high added value, and the applicability of green production is obvious.

[0029] 3. The coating liquid formula involved in the method of the present invention not only fully considers the preservation and production intensity requirements of the substrate, but also greatly meets the substrate's needs for improving quality and enhancing flavor, and can be effectively applied to the subsequent production and processing of cigarette products.

[0030] 4. The paper tip of the present invention can significantly improve the sensory quality of cigarettes, and has a uniform and obvious effect in increasing the richness of cigarette aroma, reducing irritation, and masking woody smell.

[0031] 5. The composite mouthpiece of the present invention can give flue-cured tobacco cigarettes the unique aroma of sun-dried tobacco, increase the satisfaction of smoking cigarettes, provide new technology to solve the problems of convergence of style characteristics and product homogeneity of flue-cured tobacco products, and develop and enrich the categories of flue-cured tobacco products. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a comparison diagram of conventional reconstituted tobacco leaves (a) and reconstituted tobacco leaves according to Example 1 of the present invention (b).

[0033] Figure 2 This is a structural diagram of the reconstituted tobacco paper tip rod of the present invention (a - reconstituted tobacco core material wrapped with forming paper; b - reconstituted tobacco core material).

[0034] Figure 3 This is a structural diagram of the composite nozzle rod in the present invention (a-reconstituted tobacco filter rod; b-conventional acetate fiber filter rod; c-outer wrapping paper). DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. Unless otherwise specified, the raw materials and equipment used in the examples are commercially available or commonly used in the art. The methods in the examples, unless otherwise specified, are conventional methods in the art.

[0036] Example 1: Preparation of a whole plant fiber reconstituted tobacco leaf substrate, the raw material being discarded sun-cured tobacco stem bark, which is collected and dried, and weighs approximately 100 kg.

[0037] The preparation method comprises the following steps:

[0038] (1) Hot water ultrasonic extraction: The stem bark of sun-dried tobacco leaves, which had been naturally dried and cut into 2.5 cm long pieces, was rehydrated to a moisture content of 15%, and then placed in an ultrasonic extraction tank. 400 kg of hot water at 80° C. was added and ultrasonically extracted twice, each extraction lasting 90 min. After extraction, solid-liquid separation was performed; the solid portion was pulped and sieved, and the portion of tobacco stems between 50 and 200 mesh was collected by sieving; the liquid portion (extract) was concentrated to obtain a stem bark paste;

[0039] (2) Compounding of bark pulp: The proportions calculated by dry weight are: 1% polyglycerol fatty acid ester, 5% modified polylactic acid fiber, 2% sodium carboxymethyl cellulose, 1% cationic starch, and 10% solid matter extracted from bark; the balance is water; polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, and cationic starch can be added directly; the mixed material is disintegrated and beaten with a pulping machine, and the beating degree is 15-50°SR; the prepared mixed pulp is made into a base sheet by using the papermaking method and the method of regenerating tobacco leaves, and the base sheet thickness is 50g / m 2 ;

[0040] The test results of the substrate performance are shown in Table 1 below; compared with conventional reconstituted tobacco Figure 1 shown.

[0041] Table 1 Basic performance test results of the reconstituted tobacco leaf substrate obtained in Example 1

[0042] Serial number Test items unit Detection value Testing basis 1 Quantitative g / m2 43.2 GB / T 451.2 2 thickness mm 0.096 GB / T 451.3 3 Breathability CU 418.5 GB / T 23277 4 tensile strength KN / m 0.438 GB / T 23227 5 D65 brightness ％ - GB / T 7974 6 Moisture ％ 7.20 GB / T 462

[0043] Example 2: Preparation of a whole plant fiber reconstituted tobacco leaf substrate, the raw material is sun-cured tobacco stem bark waste. The raw material is obtained by collecting and drying the stem bark, and the weight is about 100 kg.

[0044] The preparation method comprises the following steps:

[0045] (1) Hot water ultrasonic extraction: The bark of sun-dried tobacco leaves, which had been naturally dried and cut into 2.5 cm long pieces, was rehydrated to a moisture content of 15%, and then placed in an ultrasonic extraction tank. 500 kg of hot water at 90° C. was added and ultrasonically extracted twice, each time for 60 min. After extraction, solid-liquid separation was performed; the solid portion was pulped and sieved, and the portion of tobacco stems between 50 and 200 mesh was collected by sieving; the liquid portion (extract) was concentrated to obtain a bark paste;

[0046] (2) Compounding of bark pulp: The proportions calculated by dry weight are: 0.5% polyglycerol fatty acid ester, 3% modified polylactic acid fiber, 1% sodium carboxymethyl cellulose, 0.8% cationic starch, 12% solid matter extracted from bark, and the balance is water; polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, and cationic starch can be added directly; the mixed material is disintegrated and beaten with a pulping machine, and the beating degree is 15-50°SR; the prepared mixed pulp is made into a base sheet by using the papermaking method and the method of regenerating tobacco leaves, and the base sheet thickness is 30g / m 2 The test results of substrate performance are shown in Table 2 below.

[0047] Table 2 Basic performance test results of reconstituted tobacco leaf substrate in Example 2

[0048] Serial number Test items unit Detection value Testing basis 1 Quantitative g / m2 42.8 GB / T 451.2 2 thickness μm 0.095 GB / T 451.3 3 Breathability CU 415.3 GB / T 23277 4 tensile strength KN / m 0.424 GB / T 23227 5 Moisture ％ 6.82 GB / T 462

[0049] Example 3: Preparation of paper tip rods from discarded sun-dried tobacco stems. The raw material is discarded sun-dried tobacco stems harvested in Huize, Yunnan. The preparation method is as follows:

[0050] (1) Collection and preparation of sun-cured tobacco stem bark: air-dry tobacco plants until the tobacco leaves are mature. After the tobacco leaves are harvested, cut the stem bark from the root with a knife, tear off the stem bark, and dry it naturally in a ventilated place; the dried stem bark is rehydrated to a moisture content of 13-18%, sealed with plastic film, and naturally fermented at 35-45°C for 30 days. After fermentation is completed, it can be used to make recycled tobacco leaf paper base sheets. The collected weight is 200 kg;

[0051] (2) Preparation of stem bark pulp: The fermented stem bark was cut into 2.2 cm long segments, then put into an ultrasonic extraction tank, and ultrasonic extraction was performed with 1000 kg of raw materials and hot water at a temperature of 70°C. The extraction was repeated twice, each extraction time was 90 min, and solid-liquid separation was performed after extraction; the solid part was pulped and sieved, and the sieved part between 50-200 mesh was collected; the liquid part (extract) was concentrated to obtain the stem bark paste;

[0052] (3) The bark pulp is compounded in the following proportions by dry weight: 0.8% polyglycerol fatty acid ester, 3.5% modified polylactic acid fiber, 1.6% sodium carboxymethyl cellulose, 1% cationic starch, 9% solid matter extracted from the bark, and the balance being water. Polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, and cationic starch can be added directly; the mixed material is deflated and beaten in a pulping machine, with a beating degree of 15-50°SR;

[0053] (4) Papermaking machine sheeting: The prepared mixed pulp is made into a base sheet using the papermaking method of recycled tobacco leaves. The base sheet thickness is 30-50g / m 2 ;

[0054] (5) Preparation of coating liquid: 20% of stem bark extract treated by ethanol precipitation to remove sugar, pectin and protein, 6% of high-nicotine sun-cured tobacco extract, 7.0% of biological calcium carbonate, 2.0% of xanthan gum, 4% of polyglycerol stearate, 5% of glycerol, and the rest added (v / v) of 50% of ethanol to prepare the substrate coating liquid;

[0055] (6) Spraying the coating liquid on the substrate in an amount of 15-20% of the substrate dry weight; then cutting into strips with a width of 8-20 cm;

[0056] (7) Preparation and molding of paper filter rods: The cut recycled tobacco paper sheets are cut into thin filaments with a width of 0.6-1.0 mm, and then rolled into a spiral with an angle of 10-30 degrees, and wrapped with filter rod forming paper to obtain the paper nozzle rod; Figure 2 The physical properties test results are shown in Table 3;

[0057] (8) Preparation of composite nozzle rod: The nozzle rod is compounded on a composite nozzle rod forming machine. The length of the recombined composite paper nozzle rod is 15 mm, and the length of the acetate fiber filter rod is 15 mm. The filter rods are cut into 25 mm pieces; Figure 3 As shown; compounded onto a certain brand of flue-cured tobacco cigarettes to obtain a composite paper mouthpiece cigarette product.

[0058] Table 3 Physical property test results of paper mouthpiece prepared in Example 3

[0059] Sample number Circumference (mm) Mass (g) Absorption resistance (Pa) Ventilation rate (%) hardness(%) Length (mm) 1 23.8 1.226 1215 9.25 58.6 84.1 2 23.5 1.219 1220 9.18 57.2 79.9 3 23.7 1.233 1228 9.09 59.2 84.2

[0060] Example 4: Preparation of paper mouthpieces from discarded sun-dried tobacco stems. The raw material is discarded sun-dried tobacco stems harvested in Huize, Yunnan Province, which are dried and fermented (same as in Example 3) to form the paper base material. The preparation method is as follows:

[0061] (1) Preparation of stem bark pulp: The fermented stem bark is cut into 1.5 cm long segments, then put into an ultrasonic extraction tank, and ultrasonic extraction is performed by adding hot water (temperature is 80°C) 4 times the weight of the raw material. The extraction is performed twice, each extraction time is 50 min, and solid-liquid separation is performed after extraction; the solid portion is pulped and sieved, and the stem bark pulp between 100-200 mesh is collected by sieving for sheet making; the liquid portion (extract) is concentrated to obtain the stem bark paste;

[0062] (2) The bark pulp is compounded in the following proportions, calculated by dry weight: 0.3% polyglycerol fatty acid ester, 2.5% modified polylactic acid fiber, 0.6% sodium carboxymethyl cellulose, 0.6% cationic starch, 13% solid matter extracted from the bark, and the balance being water. The polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, and cationic starch can be added directly; the mixed material is deflated and beaten in a pulping machine, with a beating degree of 15-50°SR.

[0063] (3) Papermaking machine sheeting: The prepared mixed pulp is made into a base sheet using the papermaking method of recycled tobacco leaves. The base sheet thickness is 40g / m 2 ;

[0064] (4) Preparation of coating liquid: 20% of stem bark extract treated by ethanol precipitation to remove sugar, pectin and protein, 6% of sun-cured tobacco high-nicotine extract, 7.0% of biological calcium carbonate, 2.0% of xanthan gum, 4% of polyglycerol stearate, 5% of glycerol, and the rest added (v / v) of 50% of ethanol to prepare the substrate coating liquid;

[0065] (5) Spraying the coating liquid on the substrate in an amount of 15-20% of the dry weight of the substrate; then cutting into strips with a width of 8-20 cm;

[0066] (6) Preparation and molding of paper filter rods: The cut recycled tobacco paper sheets are cut into 1.0 mm strips again, then rolled into a spiral with a 15-degree angle, and wrapped with filter rod forming paper to obtain the paper tip rod;

[0067] (7) Filter rod compounding and rolling: The filter rods are compounded on a compound filter rod forming machine. The length of the recombinant tobacco stem composite paper filter rod is 15 mm, and the length of the acetate fiber filter rod is 15 mm. The filter rods are cut into 25 mm filter rods and compounded onto a certain brand of flue-cured tobacco cigarettes to obtain composite paper filter rod cigarette products made from air-dried tobacco waste;

[0068] The smoking results of the composite paper mouthpiece cigarette product are shown in Table 4. The overall results show that the sensory quality of cigarettes can be significantly improved. The specific effects include: increasing the richness of cigarette aroma, reducing irritation, and masking woody notes. The mouthpiece can impart the unique aroma of flue-cured tobacco and sun-cured tobacco, increasing the product's richness.

[0069] Table 4 Sensory evaluation comparison results of paper filter rod cigarette products prepared in Example 4

[0070]

[0071] Example 5: Preparation of a composite paper mouthpiece, wherein the raw material of the paper mouthpiece is the bark of sun-dried tobacco stems from Huize, Yunnan. The preparation method is as follows:

[0072] (1) Collection and preparation of sun-cured tobacco stem bark: air-dry tobacco plants until the tobacco leaves are mature. After the tobacco leaves are harvested, cut the stem bark from the root with a knife, tear off the stem bark, and dry it naturally in a ventilated place; the dried stem bark is soaked in water to rehydrate to a moisture content of more than 13%, packaged and sealed, and naturally fermented at 35-45°C for 30 days. After fermentation is completed, it can be used to make recycled tobacco leaf paper base sheets. The collected weight is 150 kg;

[0073] (2) Preparation of stem bark pulp: The fermented stem bark is cut into small pieces of about 2.0 cm in length, then put into an ultrasonic extraction tank, and ultrasonic extraction is performed by adding 750 kg of hot water (temperature is 70°C). The extraction is repeated twice, each time for more than one and a half hours. After the extraction, the solid and liquid are separated. The solid part is pulped and sieved. The sieved pulp collects the tobacco stem bark pulp between 50-100 mesh for sheet making; the extract (liquid phase) is concentrated and used to prepare tobacco paste for coating;

[0074] (3) Compounding the bark pulp: the proportions (calculated by dry weight) are: 0.6% polyglycerol fatty acid ester, 2% modified polylactic acid fiber, 1% sodium carboxymethyl cellulose, 1% cationic starch, 9% solid matter extracted from the bark, and the balance is water. The mixed material is deflated and beaten in a pulping machine, with a beating degree of 15-50°SR;

[0075] (4) Papermaking machine sheeting: The prepared mixed pulp is made into a base sheet using the papermaking method of recycled tobacco leaves. The base sheet thickness is 45g / m 2 ;

[0076] (5) Preparation of substrate coating liquid: 15% of stem bark extract treated by ethanol precipitation to remove sugar, pectin and protein, 8% of high-nicotine sun-cured tobacco extract, 5.0% of biological calcium carbonate, 1.0% of xanthan gum, 3% of polyglycerol stearate, 5% of glycerol, 1% of essence with throat-soothing effect, and the rest of the mixture is added as 45% (v / v) of ethanol to prepare the substrate coating liquid;

[0077] (6) Spraying the coating liquid on the substrate in an amount of 15-20% of the substrate dry weight; then cutting into strips with a width of 8-20 cm;

[0078] (7) The cut reconstituted tobacco leaf paper is cut into 1.0 mm strips again, then rolled into a spiral with a 15-degree angle, and wrapped with filter plug wrapping paper to obtain the paper tip stick;

[0079] (8) Filter rod compounding and rolling: The filter rods are compounded on a compound filter rod forming machine. The length of the reconstituted tobacco stem composite paper filter rod is 20 mm, and the length of the acetate fiber filter rod is 15 mm. The filter rods are cut into 30 mm pieces and compounded onto a certain brand of cigarettes to obtain composite filter rod cigarette products made from sun-dried tobacco waste.

[0080] The combined mouthpiece cigarette product of this embodiment exhibits significant smoking results, demonstrating a significant improvement in the sensory quality of the cigarette. Specifically, the combined mouthpiece not only imparts the characteristic air-cured tobacco aroma of flue-cured tobacco, but also, through the addition of functional flavorings, enriches the smoke's aroma, effectively reduces irritation, and enhances the smoothness of the smoke, ultimately improving the smoking quality of the cigarette.

[0081] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and such improvements and modifications should also be considered as within the scope of protection of the present invention.

Claims

1. A method for preparing a paper nozzle stick, characterized in that: The steps include: (1) Using the stem bark of sun-dried tobacco to perform hot water ultrasonic extraction, followed by solid-liquid separation; (2) pulping the solid portion of the solid-liquid separation to obtain stem bark pulp, and using a papermaking method to prepare reconstituted tobacco leaves to obtain a base sheet; (3) concentrating the liquid portion of the solid-liquid separation to obtain a stem bark paste, and using the stem bark paste to prepare a coating liquid; (4) spraying the coating liquid obtained in step (3) on the substrate obtained in step (2), and then cutting it into strips; (5) Cut the sprayed substrate into uniform filaments, then roll them into a roll and wrap them with filter rod forming paper, and cut them into the required length; thus, a paper nozzle rod is obtained.

2. The preparation method according to claim 1, characterized in that The hot water ultrasonic extraction step of step (1) is as follows: the stem bark of the air-dried tobacco leaves cut into 0.5-3.0 cm lengths is rehydrated to a moisture content of 13-18%, and naturally fermented at 35-45° C. for 20-30 days, and then ultrasonically extracted in hot water at 50-90° C. for 40-90 minutes; the mass ratio of the stem bark to the hot water is 1:(3-5).

3. The preparation method according to claim 1, characterized in that Step (2) of preparing the bark pulp comprises the following steps: mixing polyglycerol fatty acid ester, modified polylactic acid fiber, sodium carboxymethyl cellulose, cationic starch, and a solid portion, adding an appropriate amount of water, and then performing decomposition and beating, with a beating degree of 15-50° SR, to obtain a composite bark pulp; The obtained composite stem bark pulp is made into a base sheet by using the papermaking method to reconstitute tobacco leaves, so that the base sheet thickness is 30-50g / m 2 .

4. The preparation method according to claim 3, characterized in that Calculated by dry weight, the mass ratio of each component in the bark pulp is: polyglycerol fatty acid ester 0.2-1%, modified polylactic acid fiber 2-5%, sodium carboxymethyl cellulose 0.5-2%, cationic starch 0.5-1%, bark extracted solid matter 9-13%, and the balance is water.

5. The preparation method according to claim 1, characterized in that The preparation method of the coating liquid in step (3) is as follows: the stem bark paste after alcohol precipitation, the high nicotine extract of sun-cured tobacco, biological calcium carbonate, xanthan gum, polyglycerol stearate, glycerol and ethanol solution are uniformly mixed to obtain the coating liquid.

6. The preparation method according to claim 5, characterized in that The mass ratio of each component in the coating liquid is: 10-20% of alcohol-precipitated stem bark paste; 5-8% of sun-cured tobacco high-nicotine extract; 5-8% of biological calcium carbonate; 0.5-2.0% of xanthan gum; 0.1-5% of polyglycerol stearate; 3-5% of glycerol; the balance is ethanol solution, which is an aqueous solution containing 30-50% ethanol (v / v).

7. The preparation method according to claim 1, characterized in that In step (4), the spraying amount of the coating liquid is 15-20% of the dry weight of the film base; and the film is cut into strips with a width of 8-20 cm.

8. The preparation method according to claim 1, characterized in that In step (5), the width of the filament is 0.6-1.0 mm; the filament is rolled into a spiral shape with an angle of 10-30 degrees.

9. Use of the paper nozzle stick prepared by the preparation method according to claim 1 for a composite nozzle stick.

10. The use according to claim 9, characterized in that The composite nozzle rod comprises a paper nozzle rod and an acetate fiber filter rod.

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