Method for adding functional material in cigarette tow

Abstract

The invention belongs to the technical field of tobaccos, and particularly relates to a method for adding functional materials into tobacco tows. The adding method comprises the following steps: mixing the functional material and the spinning oil with an emulsion to obtain a mixed emulsion; the emulsion for the spinning oil comprises the spinning oil and water; after the mixed emulsion is smeared on the surface of a single-barrel tow, doubling, curling and drying are conducted in sequence, and the functional cigarette tow is obtained. According to the method, the functional material and the spinning oil agent are compounded through the emulsion, the spinning oil agent serves as a carrier, the functional material is added to the tow, and tow oiling and functionalization are synchronously achieved. According to the obtained functional cigarette tow, the uniformity of the functional material is good, operation is convenient and fast, and only independent oiling equipment needs to be cleaned after adding is completed. The industrial blank is filled up, and small-batch production of the functional cigarette tows can be carried out according to different customer requirements; cigarette products with different functions can be developed by performing rod rolling and cigarette receiving on the functional cigarette tow.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco, and particularly relates to a method for adding functional materials into tobacco tow. Background Art

[0002] Cigarette filters are primarily composed of cellulose diacetate tow, which has a Y-shaped cross-section, a large surface area, and a large contact area with smoke. The uniform distribution of the fibers ensures consistent filtration efficiency. Cellulose diacetate tow possesses exceptional adsorption properties, low draw resistance, and significant interception and filtration efficiency. It is non-toxic and odorless, absorbs odors and selectively absorbs harmful substances (such as nicotine in cigarettes), and possesses antibacterial and antimicrobial properties.

[0003] Cellulose diacetate tow for tobacco is made from natural wood pulp, which is acetified to form cellulose diacetate sheets. The tow is then processed through a series of processes, including dissolution, filtration, spinning, oiling, crimping, and drying. Oiling is a necessary step in the dry spinning process for diacetate tow. Its purpose is to form a layer of oil on the fiber surface, enhancing its cohesiveness, smoothness, and antistatic properties to meet the requirements of fiber production and subsequent processing. Currently, a spinning oil emulsion is commonly used to oil the tow. This process wets the fiber surface with the emulsion, allowing the spinning oil to adhere evenly to the fibers.

[0004] With the advancement of science and technology and consumers' increasing concern about smoking health, producing safe and environmentally friendly cigarettes is the future direction and goal of tobacco development. In the ongoing transformation of the tobacco industry, filter innovation remains key. To achieve functionalization of filters, it is necessary to functionalize cellulose diacetate tow (e.g., adding tar reducers to the tow to reduce tar content, or adding sweeteners and flavor enhancers to enhance the smoking experience). Therefore, it is necessary to develop a method for adding functional materials to already spun individual filaments. Summary of the Invention

[0005] In view of this, the present invention aims to provide a method for adding functional materials to tobacco tow. The method of the present invention allows the functional materials to be added to the tow, thereby achieving functionalization of the tow. Furthermore, the method of the present invention improves the uniformity of the functional materials.

[0006] The present invention provides a method for adding functional materials to tobacco tow, comprising the following steps:

[0007] Mixing the functional material and the spinning oil emulsion to obtain a mixed emulsion; the spinning oil emulsion comprises the spinning oil and water;

[0008] After the mixed emulsion is applied on the surface of a monofilament bundle, the bundle is then drawn, curled and dried in sequence to obtain a functional tobacco bundle; the monofilament bundle comprises a plurality of monofilaments.

[0009] Preferably, the mass content of the spinning oil in the spinning oil emulsion is 4% to 10%.

[0010] Preferably, the spinning oil comprises the following components in amounts by mass: 12% to 25% of a sizing agent, 45% to 70% of a liquid paraffin smoothing agent, 12% to 30% of an emulsifier and 5% to 9% of water.

[0011] Preferably, the functional material includes one or more of a tobacco strand moisturizing agent, a tobacco strand reinforcing agent, a tobacco strand cooling agent, a tobacco strand tar reducing agent, and a tobacco strand sweetening and flavoring agent.

[0012] Preferably, the mass of the functional material is 1% to 20% of the mass of the emulsion for spinning oil.

[0013] Preferably, the coating uses an oiling device, which includes an oiling tank, an oiling roller, an oiling pump and a guide roller.

[0014] Preferably, the running speed of the mono-tube tow is 400-600 m / min, and the rotation speed of the oiling roller is 80-200 rpm.

[0015] Preferably, the monofilament has a diameter of 0.028 to 0.153 mm.

[0016] Preferably, the spinning oil emulsion is an oil-in-water emulsion, and the mixed emulsion is a water-in-oil emulsion.

[0017] Preferably, the preparation method of the emulsion for spinning oil is: adding water to the spinning oil three times, and the mass content of the spinning oil in the emulsion obtained by adding water three times is 45% to 55%, 25% to 35% and 4% to 10% respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a method for adding functional materials to tobacco tow, comprising the following steps: mixing a functional material with a spinning oil emulsion to obtain a mixed emulsion; the spinning oil emulsion comprises spinning oil and water; applying the mixed emulsion to the surface of a single-tube tow, and then sequentially doubling, crimping, and drying to obtain a functional tobacco tow; the single-tube tow comprises a plurality of monofilaments. The present invention combines the functional material with the spinning oil emulsion and, using the spinning oil as a carrier, adds the functional material to the tow, thereby functionalizing the tobacco tow.

[0020] Furthermore, the present invention uses an oiling device for coating, and adds functional materials by oiling. The functional materials are coated on the monofilament bundle through an oiling roller. The functional materials have good uniformity, are easy to operate, and have strong on-site controllability. After the addition is completed, only the separate oiling device needs to be cleaned. Compared with adding functional materials to the spinning solution before spinning, the present invention has low requirements for the particle size of the functional materials (adding functional materials to the spinning solution before spinning will cause the functional material particles to be large and clog the spinning holes, resulting in broken yarns), and less equipment needs to be cleaned; compared with adding functional materials by spraying (i.e., spraying the functional materials directly onto the bundle), the functional materials of the present invention have better uniformity, and the addition of functional materials and the oiling process are carried out simultaneously, without the need for an additional spraying step.

[0021] This invention fills a gap in the tobacco industry. Starting from cellulose diacetate tow, small batches of functional tobacco tow can be produced according to different customer needs. By rolling the functional tobacco tow into rods and connecting cigarettes, cigarette products with various functions can be developed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the oiling test equipment used in the examples, wherein 1 is an oiling pump, 2 is a tow, 3 is an oiling tank, 4 is an oiling roller, 5 is a godet roller, 6 is an oiling guide, 7 is an I-type guide, and 8 is a waist roller;

[0024] Figure 2 This is a schematic diagram of the thermocouple arrangement during the suction process of Example 3;

[0025] Figure 3 This is a linear fitting diagram between the oiling roller speed and the oil content of the tow in Comparative Example 1;

[0026] Figure 4 The DSC test curves of the cooling tows of Examples 3 to 6 are as follows;

[0027] Figure 5 This is a physical picture of the mixed emulsion in Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0028] The present invention provides a method for adding functional materials to tobacco tow, comprising the following steps:

[0029] Mixing the functional material and the spinning oil emulsion to obtain a mixed emulsion; the spinning oil emulsion comprises the spinning oil and water;

[0030] After the mixed emulsion is applied on the surface of a monofilament bundle, the bundle is then drawn, curled and dried in sequence to obtain a functional tobacco bundle; the monofilament bundle comprises a plurality of monofilaments.

[0031] In the present invention, unless otherwise specified, the materials and equipment used are commercially available products in the art.

[0032] The present invention mixes functional materials and an emulsion for spinning oil to obtain a mixed emulsion; the emulsion for spinning oil comprises spinning oil and water.

[0033] In the present invention, the spinning oil preferably comprises the following components in mass content: 12% to 25% of a sizing agent, 45% to 70% of a liquid paraffin smoothing agent, 12% to 30% of an emulsifier and 5% to 9% of water.

[0034] In the present invention, the spinning oil is preferably purchased from Shaanxi Derun Xinghua Biotechnology Co., Ltd., and the model is DF oil. The spinning oil belongs to synthetic fibers and weaving auxiliaries, and is composed of a sizing agent, a liquid paraffin lubricant, an emulsifier, and water. The sizing agent is a fatty acid polyol ester with the general formula R1COOR2, wherein R1 is a C7-C17 alkyl group and R2 is a C3-C6 hydroxy-substituted alkyl group, so that the spinning oil has good cohesion. The liquid paraffin lubricant is a hydrocarbon lubricant with a kinematic viscosity of 14.0 to 18.0 cst at 40°C and a relative density of 0.830 to 0.860 g / cm at 20°C. 3 The liquid paraffin lubricant is a hydrocarbon mineral oil that imparts excellent smoothness to the fiber. The emulsifier is preferably a nonionic surfactant, preferably including Tween-20 (polyoxyethylene sorbitan monolaurate) and Span-20 (sorbitan laurate). Tween-20 has emulsifying, diffusing, stabilizing, lubricating, and antistatic properties. Span-20 is a water-in-oil nonionic surfactant with excellent emulsifying and lubricating properties. The water content is preferably 8% by weight.

[0035] In the present invention, the mass content of the spinning oil in the spinning oil emulsion is preferably 4% to 10%, more preferably 5%.

[0036] In the present invention, the emulsion for spinning oil is preferably an oil-in-water emulsion.

[0037] In the present invention, the method for preparing the spinning oil emulsion is preferably as follows: water is added to the spinning oil in three steps, wherein the mass content of the spinning oil in the emulsion obtained by the three additions of water is 45% to 55%, 25% to 35%, and 4% to 10%, respectively, and specifically can be 50%, 30%, and 5%. The water addition process is preferably accompanied by stirring, and the stirring speed is preferably 150 to 250 rpm, specifically 200 rpm, and the stirring time is preferably 10 to 30 minutes, specifically 20 minutes. The temperature during the preparation process is preferably 40°C. The preparation method of the present invention produces an emulsion with uniform oil droplet size, good emulsification properties, and good stability.

[0038] In the present invention, the functional material preferably includes one or more of a tobacco strand moisturizing agent, a tobacco strand strengthening agent, a tobacco strand cooling agent, a tobacco strand tar reducing agent, and a tobacco strand sweetening and flavoring agent;

[0039] The tobacco strand lubricant has a moisturizing effect on the strands. The tobacco strand lubricant used in the specific embodiments of the present invention is an anionic moisturizing emulsion purchased from Hubei Testele New Materials Technology Co., Ltd., model number TSTL-9190. It creates a hydrophobic structure on the strand surface, selectively reducing moisture adsorption without changing the strand's efficiency in adsorbing components in mainstream smoke. This increases the moisture content of the smoke, enhances the smoothness of the smoke, alleviates throat dryness, and significantly improves smoking comfort.

[0040] The tobacco tow strengthener, used in the embodiments of the present invention and purchased from Hubei Testele New Materials Technology Co., Ltd., is model TSTL-7109. It rapidly penetrates the interior of the tow fibers, filling the interfiber gaps and forming a uniform protective film on the fiber surface. This protective film significantly reduces friction between the tow and processing equipment, thereby improving the smoothness of the tow, reducing frictional losses, and increasing tow strength. It also effectively reduces yarn breakage, reduces the generation of flying fibers, and improves the working environment.

[0041] The tobacco strand cooling agent has a cooling effect on the strands. The tobacco strand cooling agent used in the specific embodiment of the present invention was purchased from Hubei Testele New Materials Technology Co., Ltd., model TSTL-6160; it is an anionic emulsion with phase change material as the main component, prepared by a special process; it has good affinity with the strands and can effectively form a thin film composed of phase change material on the surface of the strands. When the mainstream smoke of the high-temperature cigarette passes through, the phase change material in the film will melt in the high-temperature environment, absorbing a large amount of heat, thereby effectively reducing the temperature of the mainstream smoke and giving the strands a cooling function. The smoke temperature at the inhalation inlet of a cigarette can reach 35 to 90°C. High temperature will cause a burning and spicy irritation to the smoker. Excessive smoke temperature will also cause the filter rod to collapse and soften. The tobacco strand cooling agent can modify the strand fibers and reduce the smoke temperature. The filter made of tow with added cooling agent has excellent characteristics in controlling the cooling of smoke at the end of cigarette smoking, and will not adversely affect the taste of cigarettes.

[0042] The tar-reducing agent for tobacco tow has a tar-reducing effect on the tow. The tar-reducing agent for tobacco tow used in the specific embodiment of the present invention was purchased from Peptide Biotechnology (Xi'an) Co., Ltd. The tar-reducing hydrolyzed protein in cigarettes mainly reduces the content of toxic and carcinogenic substances in the mainstream smoke of cigarettes, improves the efficiency of cigarette filters, and is non-toxic and harmless to the human body. The tar-reducing hydrolyzed protein contains a large number of amino and hydroxyl structures, which can react with substances such as formaldehyde, and can adsorb and filter harmful substances such as polycyclic aromatic hydrocarbons and aldehydes in the tar of the mainstream smoke of cigarettes, thereby achieving the purpose of tar reduction.

[0043] The tobacco strand sweetener and flavoring agent has a sweetening and flavoring effect on the strands. The tobacco strand sweetener and flavoring agent used in the specific embodiment of the present invention was purchased from Peptide Biotechnology (Xi'an) Co., Ltd. The present invention loads the sweetener and flavoring agent on the strands to obtain a functional strand that carries fragrance. When the smoker uses tobacco products, the air can promote the aroma to be emitted evenly and continuously during the process of passing through the strands, thereby bringing a more mellow, rich and long-lasting smoking experience. This not only helps to improve the quality of cigarettes, but also helps companies create more recognizable and distinctive cigarette products that accurately meet the personalized preferences of different consumers for aroma and taste.

[0044] In the present invention, the functional material preferably meets the following conditions: it can be blended with the emulsion for spinning oil, has no odor, and is white or transparent.

[0045] In the present invention, the mass of the functional material is preferably 1% to 20% of the mass of the spinning oil emulsion, specifically 10%, 12.5%, or 16.7%. The solid content of the functional material is preferably 40%, 48%, or 50%. In terms of solid content, the mass of the functional material is preferably 5% or 8% of the mass of the spinning oil emulsion.

[0046] The present invention does not require any special method for mixing the functional material and the spinning finish emulsion, such as manual stirring. The present invention first prepares the spinning finish emulsion by mixing the spinning finish with water, and then mixes it with the functional material. Compared to directly mixing the functional material, spinning finish, and water, the resulting mixed emulsion has uniform droplet size and good stability.

[0047] In the present invention, the mixed emulsion is a stable emulsion without stratification, precipitation, or precipitation after standing. The standing time is preferably 24 to 72 hours, specifically 48 hours.

[0048] In the present invention, the mixed emulsion is a water-in-oil emulsion.

[0049] After obtaining the mixed emulsion, the present invention applies the mixed emulsion on the surface of a monofilament bundle, and then sequentially draws, curls, and dries the bundle to obtain a functional tobacco bundle (a tobacco bundle carrying functional materials); the monofilament bundle includes a plurality of monofilaments.

[0050] In the present invention, the coating preferably uses an oiling device, the structural diagram of the oiling device is as shown in FIG. Figure 1 As shown, it includes an oiling tank 3 and an oiling roller 4 for applying a mixed emulsion on the surface of the monofilament bundle;

[0051] and an oiling pump 1 for carrying the mixed emulsion to an upper oil tank;

[0052] A godet 5 that stretches the single-tube tow at a certain rate;

[0053] An oiling guide 6 for increasing the width of a single-tube tow, the width of the single-tube tow preferably ranges from 3 to 4 mm;

[0054] I-type guide 7 that guides the single-bobbin tow smoothly from the spinning machine to the crimping machine;

[0055] Waist roller 8.

[0056] The oiling roller 4 rotates in the opposite direction of the monofilament bundle, stirring up the mixed emulsion through surface tension and applying it to the monofilament bundle; each spinning drum has its own oiling roller, which applies the mixed emulsion to the surface of the bundle by rotating. The guide roller 5 is a winding shaft, and each spinning drum has its own guide roller. The oiling guide 6 can prevent the bundle from shaking laterally. The I-type guide 7 adjusts the bundle tension by changing the angle, and guides the bundle belt smoothly from the spinning machine to the winding machine. The waist roller 8 is an axis used for the initial winding operation and the final wire removal operation, and has an idling function.

[0057] The oiling equipment preferably further comprises a tank for containing the mixed emulsion, and the mixed emulsion is brought to the upper oil tank by an oiling pump, and the excess mixed emulsion in the upper oil tank will flow back to the tank.

[0058] In the present invention, the running speed of the mono-tube tow is preferably 400-600 m / min, more preferably 500 m / min.

[0059] In the present invention, the rotation speed of the oiling roller is preferably 80-200 rpm, specifically 90 rpm, 100 rpm, 110 rpm or 120 rpm.

[0060] In the present invention, the monofilament bundle preferably includes 600 monofilaments, and the diameter of the monofilaments is preferably 0.028 to 0.153 mm, specifically 0.057 mm.

[0061] In the present invention, the doubling is preferably done by doubling 12 to 20 single-tube tows into a single series of tows. The present invention has no special requirements for the doubling, crimping, and drying methods, and methods commonly used by those skilled in the art can be used.

[0062] The present invention adds functional materials during the tow production process, can develop cigarette products with different functions, improves the technical capabilities of tobacco tow manufacturers, and provides diversified structural innovations in the tow industry for diversified cigarette products.

[0063] To further illustrate the present invention, the method for adding functional materials to tobacco tow provided by the present invention is described in detail below with reference to the accompanying drawings and examples, but they should not be construed as limiting the scope of protection of the present invention.

[0064] Figure 1 This is a schematic diagram of the oiling test equipment used in the examples of the present invention, including: 1 - oiling pump (brings the mixed emulsion to the oil tank); 2 - monospool tow; 3 - oiling tank; 4 - oiling roller (applies the mixed emulsion to the monospool tow and rotates in the opposite direction of the monospool tow); 5 - godet roller; 6 - oiling guide; 7 - I-type guide (smoothly guides the monospool tow from the spinning machine to the crimping machine); 8 - waist roller. The prepared mixed emulsion is added to the tank of the test equipment, and the mixed emulsion is used by the oiling pump to add functional materials to the monospool tow in an oiling manner. Excess mixed emulsion can be returned to the tank of the test equipment.

[0065] In a specific embodiment of the present invention, a 5% spin finish emulsion is used, comprising 5 parts by weight of a spin finish and 95 parts by weight of water. The spin finish is purchased from Shaanxi Derun Xinghua Biotechnology Co., Ltd. and is designated DF oil. The preparation method for the 5% spin finish emulsion (oil first, water second) comprises the following steps: adding water to the spin finish in three separate additions, wherein the emulsions obtained by these three additions contain, respectively, 50%, 30%, and 5% spin finish by weight. Stirring is maintained during the addition of water, the temperature maintained at 40°C, the rotation speed maintained at 200 rpm, and the total stirring time maintained at 20 minutes, to produce an oil-in-water emulsion.

[0066] Example 1

[0067] A functional material (TSTL-9190, a tobacco tow lubricant purchased from Hubei Testele New Materials Technology Co., Ltd., with a solids content of 48%) was added to a 5% spinning oil emulsion (by weight) and compounded (stirred) to obtain a mixed emulsion. The lubricant was then added to a single bobbin of tow by oiling, followed by drawing, crimping, and drying to obtain a functional tow. The diameter of each filament was 0.057 mm, and each bobbin contained approximately 600 filaments. The width of the single bobbin was 3 to 4 mm. The single bobbin was operated at a speed of 500 m / min, and the oiling roller rotated at 120 rpm.

[0068] Comparing the mixed emulsion with the addition of a wetting agent with a normal emulsion (emulsion used for spinning oils): The mixed emulsion with the addition of a wetting agent is milky, pure white, odorless, and smooth to the touch; a pure white oil film forms on the oiling roller when oiling. Normal emulsion is a light blue, transparent liquid; the oil film forms on the oiling roller, which is also light blue and transparent.

[0069] Table 1 is the comparison of tow quality data before and after adding the wetting agent material:

[0070] Table 1 Comparison of tow quality data before and after adding wetting agent material

[0071]

[0072]

[0073] After adding the humectant, the functional tow's mass increased by an average of 3.22% per meter. During the forming process (the process of rolling cigarettes), fly was reduced from 18mg to 9mg, with on-site operators reporting a significant reduction in fly. The addition of the humectant also increased the strength of the functional tow from 152N to 196N, making it more resilient and difficult to break.

[0074] Example 2

[0075] A functional material (TSTL-7109, a tobacco tow enhancer purchased from Hubei Testele New Materials Technology Co., Ltd., with a solids content of 40%) was added to a 5% spinning oil emulsion at 12.5% by weight of the emulsion. The tow was then oiled and added to a single bobbin of yarn. The yarn was then drawn, crimped, and dried to produce a functional tow with a single filament diameter of 0.057 mm. Each bobbin contained approximately 600 filaments, and the width of the single bobbin was 3-4 mm. The single bobbin was operated at a speed of 500 m / min, and the oiling roller rotated at 120 rpm.

[0076] Comparing the mixed emulsion with the added enhancer material with a normal emulsion: The mixed emulsion with the added enhancer material is pure white, milky, odorless, and feels smooth and greasy. A pure white oil film forms on the oiling wheel when oiling. Normal emulsion is a light blue, transparent liquid; the oil film forms on the oiling wheel, which is also light blue and transparent.

[0077] Table 2 shows the comparison of tow quality data before and after adding reinforcing material:

[0078] Table 2 Comparison of tow quality data before and after adding reinforcing material

[0079]

[0080]

[0081] After adding the reinforcing material, the average weight of the functional tow per meter increased by 3.16%. The strength increased from 140N to 175N, and the strength stability value was greatly improved, achieving a significant reinforcement effect.

[0082] Example 3

[0083] A functional material (TSTL-6160, a tobacco tow cooling agent purchased from Hubei Testele New Materials Technology Co., Ltd., with a solids content of 50%) was added to a 5% spinning oil emulsion, and then added to a single bobbin of tow by oiling. The tow was then drawn, crimped, and dried to produce a functional tow with a single filament diameter of 0.057 mm. Each bobbin contained approximately 600 filaments, and the width of the tow was 3 to 4 mm. The tow was operated at a speed of 500 m / min, and the oiling roller rotated at 120 rpm.

[0084] Table 3 is the comparison of tow quality data before and after adding cooling agent material:

[0085] Table 3 Comparison of tow quality data before and after adding cooling agent material:

[0086]

[0087]

[0088] After adding the cooling agent, the average weight per meter of functional tow increased by 4.7%. The original strength range was 105-145N, with a total strength of 129N. After adding the cooling agent, the strength increased significantly, making the functional tow more resilient and difficult to break, reaching a strength of 167N, a significant improvement in strength. There was no significant difference in crimping energy between the original and the samples with the cooling agent. Adding the cooling agent reduced fly during the molding process, with field operators reporting a significant reduction in fly. PDCV showed no significant change.

[0089] Figure 2 This is a diagram of the thermocouple setup during the smoking process (smoke temperature test setup diagram). The filter is 30mm long (the entire cigarette is 120mm long), the ventilation holes are set at approximately 15mm, and the thermocouple spacing is 6mm. Table 4 shows the smoke temperature data for the seventh puff:

[0090] Table 4 Seventh flue gas temperature data

[0091] Sample name Thermocouple 1 (tobacco end) ℃ Thermocouple 6 (inlet end) ℃ Blank control sample 105.34±14.42 72.05±2.68 Cooling tow sample 110.87±12.04 63.66±6.42

[0092] Combine Figure 2 It can be seen from the data in Table 4 that the inlet temperature of the functional tow sample with the cooling agent added is 8.39°C lower than that of the blank control sample, which has an obvious cooling effect.

[0093] Third-party testing demonstrated that filters made from the functional tow of Example 3 exhibited excellent smoke cooling control at the end of cigarette puffing, without adversely affecting the cigarette's taste. The successful development of this functional tow and the continuous production trial of the finished product represent a pioneering effort in functional modification of tobacco acetate fibers both domestically and internationally, providing valuable experience for the future innovation and development of tobacco acetate products.

[0094] Comparative Example 1

[0095] The only difference from Example 1 is that no functional material was added, and the tow was oiled using a 5% emulsion for spinning oil. The speed of the oiling roller (oiler) is shown in Table 5 below. In actual production, as the speed of the oiling roller increases, the oil content of the tow increases, and there is a linear correlation, as shown in Table 5:

[0096] Table 5 Comparison of tanker speed and tow oil content

[0097]

[0098]

[0099] Figure 3This is a linear fitting diagram between the oil roller speed and the oil content of the tow. It can be seen that the two have a strong correlation and are linearly correlated.

[0100] Examples 4 to 6

[0101] The only difference from Example 3 is that the rotation speed of the oiling roller is sequentially reduced from 120 rpm to 110 rpm, 100 rpm, and 90 rpm, and the remaining steps are the same.

[0102] Figure 4 The DSC test curves for the cooling tows of Examples 3 to 6 are shown, with the numbers corresponding to oil roller speeds of 120 rpm, 110 rpm, 100 rpm, and 90 rpm, respectively. Table 6 shows the endothermic behavior of the cooling tow fibers during heating, as measured by differential scanning calorimetry (DSC) at different oil roller speeds.

[0103] Table 6 DSC test data of cooling tow fiber

[0104] / Tanker speed (rpm) <![CDATA[T m (℃)]]> <![CDATA[ΔH m (W·g -1 )]]> Oil content (%) Example 3 120 62.4 49.79 2.64 Example 4 110 66.2 50.28 2.92 Example 5 100 70.6 52.65 3.32 Example 6 90 71.1 54.25 4.27

[0105] from Figure 4 It can be seen that under different oil roller (oil wheel) speeds, the cooling tow fiber has obvious endothermic peaks. Combined with the test data in Table 6, it can be seen that with the decrease of the oil roller speed, the melting peak temperature of the cooling tow fiber drifts to high temperature, and the thermal enthalpy value of the cooling tow fiber is relatively high, from 49.79W·g -1 Increased to 54.25W·g -1 The change trend is consistent with the change trend of oil content, indicating that as the oil roller speed decreases, more cooling agent material is absorbed into the tow fibers. Overall, the cooling tow fibers have good heat absorption performance.

[0106] Comparative Example 2

[0107] The only difference from Example 1 is that the functional material, spinning oil and water are directly mixed to prepare the mixed emulsion, the temperature is controlled at 40°C, the stirring speed is 200 rpm, and the stirring time is 20 minutes. The blending effect is poor, and the mixed emulsion has tiny solid particles precipitated on the bottle wall and the surface of the mixed emulsion. Figure 5 The transparent bottle on the right side of the middle. The mixed emulsion obtained by direct mixing has sediment at the bottom and cannot be used. During the addition process, sediment will form in the pipeline, blocking the oil supply pipeline, and solid particles will precipitate. There is a possibility that solid particles will fall out during subsequent processes, which does not meet the use requirements.

[0108] In Example 1, when the functional material is mixed with 5% emulsion for spinning oil, it has a better emulsification effect, no stratification, no precipitation, and Figure 5The mixed emulsion obtained in the example is a stable emulsion without precipitation, stratification, or solid particle precipitation, forming a blended emulsion system, which facilitates the subsequent addition of functional materials to the yarn bundle using the spinning oil as a carrier.

[0109] Although the above embodiments provide a detailed description of the present invention, they are only part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on the embodiments of the present invention without creative work, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A method for adding functional materials to tobacco tow, characterized in that: The following steps are involved: Mixing the functional material and the spinning oil emulsion to obtain a mixed emulsion; the spinning oil emulsion comprises the spinning oil and water; After the mixed emulsion is applied on the surface of a monofilament bundle, the bundle is then drawn, curled and dried in sequence to obtain a functional tobacco bundle; the monofilament bundle comprises a plurality of monofilaments.

2. The adding method according to claim 1, characterized in that The mass content of the spinning oil in the spinning oil emulsion is 4% to 10%.

3. The adding method according to claim 1 or 2, characterized in that The spinning oil comprises the following components in weight: 12% to 25% of a sizing agent, 45% to 70% of a liquid paraffin smoothing agent, 12% to 30% of an emulsifier and 5% to 9% of water.

4. The adding method according to claim 1, characterized in that The functional material comprises one or more of a tobacco strand moisturizing agent, a tobacco strand reinforcing agent, a tobacco strand cooling agent, a tobacco strand tar reducing agent, and a tobacco strand sweetening and flavoring agent.

5. The adding method according to claim 1 or 4, characterized in that The mass of the functional material is 1% to 20% of the mass of the emulsion for spinning oil.

6. The adding method according to claim 1, characterized in that The coating uses an oiling device, which includes an oiling tank, an oiling roller, an oiling pump and a guide roller.

7. The adding method according to claim 6, characterized in that The running speed of the mono-drum tow is 400-600 m / min, and the rotating speed of the oiling roller is 80-200 rpm.

8. The adding method according to claim 1 or 7, characterized in that The diameter of the monofilament is 0.028-0.153 mm.

9. The adding method according to claim 1, characterized in that The emulsion for spinning oil is an oil-in-water emulsion, and the mixed emulsion is a water-in-oil emulsion.

10. The adding method according to claim 1 or 9, characterized in that The preparation method of the emulsion for spinning oil comprises the following steps: adding water to the spinning oil three times, wherein the mass content of the spinning oil in the emulsion obtained by adding water three times is 45% to 55%, 25% to 35% and 4% to 10% respectively.

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