Method for improving combustibility of cigar tobacco leaves and gray scale of cigarette ash and application of method

Abstract

The invention provides a method for improving combustibility of cigar tobacco leaves and ash gray and application of the method, and belongs to the technical field of tobacco production processes. The method comprises the following steps: harvesting naturally mature fresh raw tobacco leaves, cutting the petiole ends of the raw tobacco leaves into wedge shapes, and soaking the petiole ends of the raw tobacco leaves in a composite synergist mother solution for 1-2 days; and airing the raw tobacco leaves subjected to stem soaking to obtain the cigar raw tobacco leaves. The composite synergist mother liquor comprises the following components in percentage by mass: 5-8% of water-soluble sylvite, 6-9% of water-soluble calcium salt and 7-10% of water-soluble magnesium salt. The water-soluble potassium salt is monopotassium phosphate or potassium nitrate; the water-soluble calcium salt is calcium nitrate; the water-soluble magnesium salt is magnesium nitrate, magnesium sulfate or chelated magnesium. By means of the method, the smoldering time of the tobacco leaves can be remarkably prolonged, and cigarette ash becomes white.

Description

Technical Field

[0001] This invention belongs to the field of tobacco production technology, specifically a method for improving the combustibility of cigar tobacco leaves and the ash content of ash, and its application. Background Technology

[0002] The combustibility of tobacco leaves refers to their ability to burn without a flame in a free state after being ignited. This property directly affects the sensory quality of tobacco products. For cigars, ash color is an important visual indicator for judging their quality. Generally, the whiter the ash, the better the quality, the higher the grade of the cigar, and the better the visual experience for consumers. Therefore, combustibility and ash color are core indicators for measuring the quality of tobacco products.

[0003] The combustibility and ash color of cigar tobacco leaves are influenced by a variety of factors, among which the content and ratio of mineral elements are particularly important. Studies have shown that the potassium ion content in tobacco leaves is positively correlated with combustibility, while the ash color value is significantly negatively correlated with the calcium and magnesium content in the tobacco leaves. The main raw material for cigar tobacco leaves is sun-cured tobacco, but due to its low yield, improper fertilization or variations in soil parent material often occur in the pursuit of higher yields, leading to an imbalance in the content and ratio of mineral elements in the tobacco leaves. This results in poor combustibility and dark ash in sun-cured tobacco leaves and their products, seriously affecting the sensory quality of the final product.

[0004] Several patents in the prior art have attempted to improve the combustibility of cigar tobacco leaves. For example, Chinese patent CN103120362B discloses a method to improve combustibility by soaking cigar tobacco leaves in a saccharifying enzyme aqueous solution, followed by dehydration and fermentation. This method mainly improves combustibility by reducing the chloride ion content in the tobacco leaves, but its applicability is limited and it cannot solve combustibility problems caused by non-chloride ion factors. Furthermore, Chinese patent applications CN107692303A and CN107692305A involve a technology that combines waste tobacco materials with plant extracts after microbial fermentation and then processes them into heat-not-burn tobacco sheets. Their main purpose is to achieve resource utilization and reduce consumption while increasing efficiency, without directly optimizing the combustibility and ash color of cigar tobacco leaves. In addition, Chinese patent CN105054286B proposes using compound enzyme preparations to ferment cigar tobacco leaves to improve their flavor, such as reducing spiciness and bitterness, but its technical focus is not on improving combustibility or ash color. Another method, CN114403496B, provides a method for spraying synergists containing magnesium, potassium salts and chitosan in the post-fermentation stage to improve the combustibility and ash content of tobacco leaves. However, this technology is mainly applied to cigar tobacco leaves after drying, and the foliar spraying method is prone to uneven distribution of the agent, affecting the consistency of the treatment effect.

[0005] In summary, existing technologies mostly focus on processing sun-dried tobacco leaves or are limited to the control of specific elements (such as chloride ions). Therefore, it is necessary to provide a more efficient, uniform processing method suitable for the early stages of cigar tobacco leaf production, fundamentally improving its combustion quality and appearance. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method for improving the combustibility and ash ash of cigar tobacco leaves. This method can not only improve the combustibility and ash ash ash of tobacco leaves, but also reduce the cost of industrial fermentation of cigar tobacco leaves and improve the utilization rate of cigar tobacco leaves.

[0007] Another object of the present invention is to provide cigar tobacco leaves prepared by the method described above.

[0008] Another object of the present invention is to provide the use of the cigar tobacco leaves in the preparation of cigars.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solution: The present invention also provides a method for improving the combustibility and ash color of cigar tobacco leaves, the method comprising the following steps: Harvest naturally matured fresh tobacco leaves, cut the petiole end of the tobacco leaves into a wedge shape, and soak the petiole in the compound synergist mother liquor for 1-2 days; The raw tobacco leaves after soaking the stem are dried to obtain cigar tobacco leaves.

[0010] Preferably, the composite synergist stock solution contains, by mass percentage, 5-8% water-soluble potassium salt, 6-9% water-soluble calcium salt and 7-10% water-soluble magnesium salt.

[0011] More preferably, the water-soluble potassium salt is potassium dihydrogen phosphate or potassium nitrate; the water-soluble calcium salt is calcium nitrate; and the water-soluble magnesium salt is magnesium nitrate, magnesium sulfate, or chelated magnesium.

[0012] Preferably, the total drying time for the raw tobacco leaves is 24-33 days.

[0013] The present invention also provides cigar tobacco leaves prepared by the method described above.

[0014] The present invention also provides the application of the cigar tobacco leaves described above in the preparation of cigars.

[0015] Compared with the prior art, the present invention has the following advantages: (1) This invention provides a method for improving the combustibility and ash color of cigar tobacco leaves. Based on a scientific ratio of elements affecting combustibility and ash color, potassium improves combustibility, while calcium and magnesium synergistically whiten the ash, resulting in a significant synergistic effect. Experimental data show that the normalized ash color of the treated tobacco leaves is significantly reduced, and the ash is whiter. Simultaneously, the smoldering time is significantly prolonged, achieving simultaneous optimization of combustibility and ash appearance.

[0016] (2) This invention fundamentally improves the intrinsic combustion characteristics of tobacco leaves by soaking the petioles after harvesting and before drying, resulting in a more stable and longer-lasting effect. Compared with existing foliar spraying methods that are prone to uneven application, this method utilizes the natural transport function of the vascular bundles of tobacco leaves to ensure more uniform and sufficient absorption of the synergist components, effectively avoiding local over- or under-absorption, ensuring the uniformity of quality of the same batch of tobacco leaves, and improving the stability of product quality.

[0017] (3) By soaking the petioles before drying, the present invention reduces or eliminates the reliance on subsequent complex fermentation processes, shortens the overall processing cycle, saves time and energy costs in industrial production, is more suitable for large-scale production, and has significant economic benefits. Attached Figure Description

[0018] Figure 1 Image of Chuanxue No. 4 cigar ash after treatment with distilled water using the method of this invention; Figure 2 Image of Dexue No. 4 cigar ash after treatment with the method of this invention and distilled water. Detailed Implementation

[0019] This invention provides a composite synergist stock solution, preferably comprising 5-8% water-soluble potassium salt, 6-9% water-soluble calcium salt, and 7-10% water-soluble magnesium salt by mass percentage; more preferably, the composite synergist stock solution comprises 5-8% water-soluble potassium salt, 6-9% water-soluble calcium salt, and 7-10% water-soluble magnesium salt by mass percentage; even more preferably, the composite synergist stock solution comprises 5% water-soluble potassium salt, 6% water-soluble calcium salt, and 7% water-soluble magnesium salt by mass percentage. In this invention, the water-soluble potassium salt is preferably potassium dihydrogen phosphate or potassium nitrate; the water-soluble calcium salt is preferably calcium nitrate; and the water-soluble magnesium salt is preferably magnesium nitrate, magnesium sulfate, or chelated magnesium. In this invention, as a preferred embodiment, the preparation method of the composite synergist mother liquor is as follows: Accurately weigh a predetermined mass of water-soluble potassium salt, water-soluble calcium salt, and water-soluble magnesium salt according to the required concentration, and place them in a container; add some deionized water or purified water to the container, and stir at room temperature until all salts are completely dissolved; subsequently, transfer the solution to a volumetric flask, and dilute to the required volume with deionized water or purified water, mix well, and a homogeneous and transparent composite synergist is obtained. In this invention, as a preferred embodiment, the preparation method of a composite synergist mother liquor with a concentration of 5% potassium dihydrogen phosphate, 6% calcium nitrate, and 7% magnesium nitrate is as follows: Weigh 50g of potassium dihydrogen phosphate, 60g of calcium nitrate, and 70g of magnesium nitrate respectively, place them in a beaker, add approximately 700mL of deionized water at a temperature of 25±5℃, and stir magnetically until completely dissolved. Transfer the resulting solution to a 1000mL volumetric flask, wash the beaker with deionized water and dilute to the mark, shake well, and the product is obtained. In this invention, when preparing the composite synergist stock solution as described above, water-soluble salts that do not precipitate with each other are selected. In another preferred embodiment of this invention, high-concentration single-salt solutions are prepared separately as stock solutions, and then mixed and diluted proportionally before use, which effectively avoids precipitation problems that may occur at high concentrations. In this invention, all raw materials can be purchased from conventional commercially available products.

[0020] This invention also provides an application of the aforementioned composite synergist mother liquor in improving the combustibility and ash color of cigar tobacco leaves. Experiments show that treating tobacco leaves with the composite synergist mother liquor of this invention significantly prolongs the smoldering time, significantly reduces the ash color, whitens the ash, and significantly increases the potassium, calcium, and magnesium content in the tobacco leaves.

[0021] The present invention also provides a method for improving the combustibility and ash color of cigar tobacco leaves, wherein the method preferably includes the following steps: Harvest naturally matured fresh tobacco leaves, cut the petiole end of the tobacco leaves into a wedge shape, and soak the petiole in the compound synergist mother liquor for 1-2 days; The raw tobacco leaves after soaking the stem are dried to obtain cigar tobacco leaves.

[0022] In this invention, the petiole end of the tobacco leaf is cut into a wedge shape.

[0023] In this invention, the total drying time for the raw tobacco leaves is preferably 24-33 days. The drying process consists of four stages: wilting, yellowing, browning, and skeletal drying. The wilting stage generally lasts 3-4 days, during which the leaves soften and wilt, and the leaf tips and edges turn yellow. The relative humidity inside the drying rack should be maintained at 80-85%. Direct sunlight and high temperatures should be avoided to prevent excessive water loss, which can lead to phenomena such as "dead green," "withered tips and scorched edges," and "green spots." The yellowing stage generally lasts 5-7 days, during which the leaves lose some of their green color, turn yellow, and soften. The relative humidity inside the drying room should be maintained at 65-80%. The browning stage generally lasts 10-15 days, during which the leaf color changes from yellow to brown, and the veins are completely dry. The relative humidity inside the drying rack should be maintained between 65-75%. The skeletal drying stage generally lasts 6-7 days, during which the tobacco leaf color deepens, and the main veins are completely dry. The relative humidity inside the drying rack should be maintained below 60%.

[0024] The present invention also provides cigar tobacco leaves prepared by the method described above.

[0025] The present invention also provides the application of the cigar tobacco leaves described above in the preparation of cigars.

[0026] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0027] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available products.

[0028] Example 1 A composite synergist stock solution, by mass percentage, comprises 5% water-soluble potassium salt, 6% water-soluble calcium salt and 7% water-soluble magnesium salt; wherein the water-soluble potassium salt is potassium nitrate, the water-soluble calcium salt is calcium nitrate and the water-soluble magnesium salt is magnesium nitrate.

[0029] The preparation steps of the above-mentioned composite synergist mother liquor are as follows: Weigh 50g of potassium nitrate, 60g of calcium nitrate, and 70g of magnesium nitrate respectively, place them in a beaker, add about 700mL of deionized water at a temperature of 25±5℃, and stir magnetically until completely dissolved. Transfer the resulting solution to a 1000mL volumetric flask, wash the beaker with deionized water and dilute to the mark, shake well, and the solution is obtained.

[0030] Example 2 A composite synergist stock solution, by mass percentage, comprises 5% water-soluble potassium salt, 6% water-soluble calcium salt and 7% water-soluble magnesium salt; wherein the water-soluble potassium salt is potassium nitrate, the water-soluble calcium salt is calcium nitrate and the water-soluble magnesium salt is chelated magnesium.

[0031] The preparation steps of the above-mentioned composite synergist mother liquor are as follows: Weigh 50g of potassium nitrate, 60g of calcium nitrate, and 70g of chelated magnesium, place them in a beaker, add approximately 700mL of deionized water at a temperature of 25±5℃, and stir magnetically until completely dissolved. Transfer the resulting solution to a 1000mL volumetric flask, wash the beaker with deionized water and dilute to the mark, shake well, and the solution is obtained.

[0032] Example 3 A composite synergist stock solution, by mass percentage, comprises 5% water-soluble potassium salt, 6% water-soluble calcium salt and 7% water-soluble magnesium salt; wherein the water-soluble potassium salt is potassium dihydrogen phosphate, the water-soluble calcium salt is calcium nitrate and the water-soluble magnesium salt is magnesium nitrate.

[0033] The preparation steps of the above-mentioned composite synergist mother liquor are as follows: Weigh 50g of potassium dihydrogen phosphate, 60g of calcium nitrate, and 70g of magnesium nitrate, respectively, and place them in a beaker. Add approximately 700mL of deionized water at a temperature of 25±5℃, and stir magnetically until completely dissolved. Transfer the resulting solution to a 1000mL volumetric flask, wash the beaker with deionized water, and dilute to the mark. Shake well to obtain the final product.

[0034] Example 4 A composite synergist stock solution, by mass percentage, comprises 5% water-soluble potassium salt, 6% water-soluble calcium salt and 7% water-soluble magnesium salt; wherein the water-soluble potassium salt is potassium dihydrogen phosphate, the water-soluble calcium salt is calcium nitrate and the water-soluble magnesium salt is chelated magnesium.

[0035] The preparation steps of the above-mentioned composite synergist mother liquor are as follows: Weigh 50g of potassium dihydrogen phosphate, 60g of calcium nitrate, and 70g of chelated magnesium, place them in a beaker, add approximately 700mL of deionized water at a temperature of 25±5℃, and stir magnetically until completely dissolved. Transfer the resulting solution to a 1000mL volumetric flask, wash the beaker with deionized water and dilute to the mark, shake well, and the solution is obtained.

[0036] Example 5 A method for improving the combustibility of cigar tobacco leaves and the ash color of cigar ash comprises the following steps: Harvest naturally matured fresh tobacco leaves, and cut the petiole end of the tobacco leaves into a wedge shape with a blade; place the treated petiole end of the tobacco leaves into the mother liquor of the compound synergist prepared in Example 1 and soak the petiole for 1 day. The raw tobacco leaves, after being soaked in the stem, are dried for 24 days to obtain cigar tobacco leaves. The drying process involves four stages: wilting, yellowing, browning, and drying. The wilting stage typically lasts 3 days, during which the leaves soften and wilt, and the tips and edges turn yellow. The relative humidity inside the drying racks must be maintained at 80-85%. Direct sunlight and high temperatures should be avoided to prevent excessive water loss, which can lead to "dead green," "withered tips and scorched edges," and "green spots." The yellowing stage typically lasts 5 days, during which the leaves lose some of their green color, turn yellow, and soften. The relative humidity inside the drying racks must be maintained at 65-80%. The browning stage typically lasts 10 days, during which the leaves change from yellow to brown, and the veins dry completely. The relative humidity inside the drying racks must be maintained between 65-75%. The drying stage typically lasts 6 days, during which the leaves darken in color, and the main veins dry completely. The relative humidity inside the drying racks must be maintained below 60%.

[0037] Example 6 A method for improving the combustibility of cigar tobacco leaves and the ash color of cigar ash comprises the following steps: Harvest naturally matured fresh tobacco leaves, and cut the petiole end of the tobacco leaves into a wedge shape with a blade; immerse the treated petiole end of the tobacco leaves in the mother liquor of the compound synergist prepared in Example 2 for 2 days; The raw tobacco leaves, after being soaked in the stem, are dried for 33 days to obtain cigar tobacco leaves. The drying process involves four stages: wilting, yellowing, browning, and drying. The wilting stage typically lasts 4 days, during which the leaves soften and wilt, and the tips and edges turn yellow. The relative humidity inside the drying racks must be maintained at 80-85%. Direct sunlight and high temperatures should be avoided to prevent excessive water loss, which can lead to "dead green," "withered tips and scorched edges," and "green spots." The yellowing stage typically lasts 7 days, during which the leaves lose some of their green color, turn yellow, and soften. The relative humidity inside the drying racks must be maintained at 65-80%. The browning stage typically lasts 15 days, during which the leaves change from yellow to brown, and the veins dry completely. The relative humidity inside the drying racks must be maintained between 65-75%. The drying stage typically lasts 7 days, during which the leaves darken in color, and the main veins dry completely. The relative humidity inside the drying racks must be maintained below 60%.

[0038] Example 7 A method for improving the combustibility of cigar tobacco leaves and the ash color of cigar ash comprises the following steps: Harvest naturally matured fresh tobacco leaves, and cut the petiole end of the tobacco leaves into a wedge shape with a blade; immerse the treated petiole end of the tobacco leaves in the mother liquor of the compound synergist prepared in Example 3 for 2 days. The raw tobacco leaves, after being soaked in the stem, are dried for 30 days to obtain cigar tobacco leaves. The drying process involves four stages: withering, yellowing, browning, and skeletal drying. The withering stage typically lasts 4 days, during which the leaves soften and wilt, and the tips and edges turn yellow. The relative humidity inside the drying rack must be maintained at 80-85%. Direct sunlight and high temperatures should be avoided to prevent excessive water loss, which can lead to "dead green," "withered tips and scorched edges," and "green spots." The yellowing stage typically lasts 6 days, during which the leaves lose some of their green color, turn yellow, and soften. The relative humidity inside the drying rack must be maintained at 65-80%. The browning stage typically lasts 13 days, during which the leaves change from yellow to brown, and the veins dry completely. The relative humidity inside the drying rack must be maintained between 65-75%. The skeletal drying stage typically lasts 7 days, during which the color of the tobacco leaves deepens, and the main veins dry completely. The relative humidity inside the drying rack must be maintained below 60%.

[0039] Experimental Example 1 The cultivation experiment was conducted in July 2024 in Fengcheng Town, Xuanhan County, Dazhou City, Sichuan Province. In March, the land was prepared and ridges were made before planting, with a ridge width of 1.1m. Before ridging, 750kg / hm² of tobacco-specific compound fertilizer (12-12-25) was applied in strips. 2 150 kg / hm² of superphosphate 2 1500 kg / hm of decomposed oil cake 2 The fertilizer was evenly mixed, and after ridging, the seedlings were covered with mulch. In April, when transplanting the tobacco seedlings, holes were dug, the seedlings were transplanted, and watered. The transplanting density was 110cm × 40cm, with 1450 plants per mu (approximately 667 square meters). The tested variety was Chuanxue No. 4. Forty days after transplanting, the mulch was removed, soil was mounded around the seedbed, and 150 kg / hm² of tobacco-specific compound fertilizer (12-12-25) was applied. 2 And special top dressing (13-0-46) 300kg / hm 2 Other aspects were carried out according to local high-quality tobacco production and cultivation management measures. Mature tobacco leaf samples were collected in July. One sample was tested for moisture content (82.34%), potassium content (3.00%), calcium content (2.42%), and magnesium content (0.58%). Another sample had the petiole end of the raw tobacco leaf cut into a wedge shape with a blade, followed by a solution immersion culture experiment. The potassium culture experiment included nine treatments: Treatment 1: cultured in distilled water for 2 days (CK); Treatment 2: cultured in 5% potassium nitrate solution for 2 days; Treatment 3: cultured in 5% potassium sulfate solution for 2 days; Treatment 4: cultured in 5% potassium dihydrogen phosphate solution for 2 days; Treatment 5: cultured in 3% potassium nitrate solution for 2 days; Treatment 6: cultured in 8% potassium nitrate solution for 2 days; Treatment 7: cultured in 5% potassium nitrate solution for 0.5 days; Treatment 8: cultured in 5% potassium nitrate solution for 1 day; Treatment 9: cultured in 5% potassium nitrate solution for 3 days. After the culture period, samples were taken and dried according to the drying method in Example 7.

[0040] The calcium culture experiment included eight treatments: Treatment 1: cultured in distilled water for 2 days (CK); Treatment 2: cultured in 6% calcium nitrate solution for 2 days; Treatment 3: cultured in 6% chelated calcium solution for 2 days; Treatment 4: cultured in 3% calcium nitrate solution for 2 days; Treatment 5: cultured in 9% calcium nitrate solution for 2 days; Treatment 6: cultured in 6% calcium nitrate solution for 0.5 days; Treatment 7: cultured in 6% calcium nitrate solution for 1 day; and Treatment 8: cultured in 6% calcium nitrate solution for 3 days. After the culture was completed, samples were taken and dried according to the drying method in Example 7.

[0041] Nine treatments were set up for the magnesium culture experiment: Treatment 1: cultured in distilled water for 2 days (CK); Treatment 2: cultured in 7% magnesium nitrate solution for 2 days; Treatment 3: cultured in 7% magnesium sulfate solution for 2 days; Treatment 4: cultured in 7% chelated magnesium solution for 2 days; Treatment 5: cultured in 4% magnesium sulfate solution for 2 days; Treatment 6: cultured in 10% magnesium sulfate solution for 2 days; Treatment 7: cultured in 7% magnesium sulfate solution for 0.5 days; Treatment 8: cultured in 7% magnesium sulfate solution for 1 day; and Treatment 9: cultured in 7% magnesium sulfate solution for 3 days. After the culture was completed, samples were taken and dried according to the drying method in Example 7.

[0042] Two samples of the above-mentioned cultivated and dried cigar tobacco leaves were selected. One sample was hand-rolled by a specialist into a standard medium-sized cigar (GB / T 15269.1-2010 Cigars Part 1: Product Classification and Sampling Technical Requirements). The rolled cigar sample was equilibrated for 48 hours at 25℃ and 70% humidity. The cigar sample was lit and the sample was drawn by an automatic cigar extractor until the ash length of each standard cigar sample was 1.0-1.5cm, and then allowed to extinguish naturally. The method of Mu Lin et al. (Mu Lin, Hui Jianquan, Feng Yajie, Liang Miao, Wang Jianmin, Che Yue, Ren Xiangwei. Establishment and application of method for determining the gray value of cigarette ash [J]. Tobacco Science and Technology, 2018, 51(7): 67-72.) was used for ash column preparation, image acquisition, gray value determination and data normalization. Another sample was placed in a kraft paper bag and blanched in an oven at 105℃ for 30 minutes. It was then dried at a constant temperature of 80℃ until constant weight, and after drying and cooling, it was pulverized. Total potassium was determined using the conventional method of sulfuric acid-hydrogen peroxide (H₂SO₄-H₂O₂) digestion flame photometry, and total calcium and total magnesium were determined using a wet digestion atomic absorption spectrophotometer. The test results are shown in Tables 1, 2, and 3.

[0043] Table 1. Effects of potassium fertilizer type, concentration, and soaking time on the normalized value of flue ash ash and potassium content of tobacco leaves.

[0044] Note: In the table, the same letter indicates no significant difference, and different letters indicate a significant difference. P <0.05) As shown in Table 1 above, among the potassium fertilizer types, the normalized value of tobacco ash (the smaller the value, the whiter the ash) treated with potassium dihydrogen phosphate was significantly lower than other treatments, followed by potassium nitrate treatment, with the highest being the distilled water control. Correspondingly, the potassium content of tobacco treated with potassium dihydrogen phosphate was significantly higher than other treatments, followed by potassium nitrate and potassium sulfate, with the lowest being the distilled water control. Among the potassium fertilizer concentrations, the normalized value of tobacco ash was significantly lower in the 5% potassium nitrate and 8% potassium nitrate treatments than other treatments, while the potassium content was significantly higher, although there was no significant difference in the normalized value of ash between these two treatments. The potassium content of tobacco treated with 8% potassium nitrate was significantly higher than that treated with 5% potassium nitrate. When soaked for 0.5 days, the normalized value of tobacco ash was significantly lower than other treatments, while the potassium content was significantly higher. When soaked for 1-2 days, the normalized value of tobacco ash was significantly lower than the distilled water control, while the potassium content was significantly higher, but the effect was slightly less than that of soaking for 0.5 days. This indicates that soaking cigar tobacco leaves in 5%-8% potassium dihydrogen phosphate or potassium nitrate for 0.5-2 days can significantly improve the ash color and potassium content of the tobacco leaves, thereby improving the combustibility of the tobacco leaves.

[0045] Table 2. Effects of calcium fertilizer type, concentration, and soaking time on the normalized value of flue ash ash size and calcium content of tobacco leaves.

[0046] Note: In the table, the same letter indicates no significant difference, and different letters indicate a significant difference. P <0.05) As shown in Table 2 above, among the calcium fertilizer types, the normalized ash value of tobacco leaves treated with calcium nitrate was significantly lower than that of other treatments, and correspondingly, the calcium content of tobacco leaves treated with this method was significantly higher than that of other treatments. Among the calcium fertilizer concentrations, the normalized ash value of tobacco leaves treated with 6% and 9% calcium nitrate was significantly lower than that of other treatments, while the calcium content of tobacco leaves was significantly higher than that of other treatments, but there was no significant difference in the normalized ash value and calcium content between these two treatments. After soaking for 1-2 days, the normalized ash value of tobacco leaves was significantly lower than that of other treatments, while the calcium content was significantly higher than that of the control. This indicates that soaking in 6%-9% calcium nitrate for 1-2 days can significantly improve the ash ash and calcium content of cigar tobacco leaves, thereby improving the combustibility of the tobacco leaves.

[0047] Table 3. Results of the effect of magnesium fertilizer type, concentration, and soaking time on the normalized value of flue ash ash and magnesium content of tobacco leaves.

[0048] Note: Identical letters in the table indicate no significant difference, while different letters indicate a significant difference (P<0.05). As shown in Table 3 above, among magnesium fertilizer types, the normalized ash value of tobacco leaves treated with magnesium nitrate was significantly lower than that of other treatments, followed by chelated magnesium and magnesium sulfate treatments. Correspondingly, the magnesium content of tobacco leaves in these treatments was significantly higher than the control. Among magnesium fertilizer concentrations, the normalized ash value of tobacco leaves treated with 10% magnesium sulfate was significantly lower than that of other treatments, while the magnesium content was significantly higher. The effect of 7% magnesium sulfate treatment on normalized ash value and magnesium content was second only to 10% magnesium sulfate treatment. After soaking for 1-2 days, the normalized ash value of tobacco leaves was significantly lower than that of other treatments, while the magnesium content was significantly higher. This indicates that soaking cigar tobacco leaves in 7%-10% magnesium nitrate, magnesium sulfate, or chelated magnesium for 1-2 days can significantly improve the ash ash and magnesium content, thereby improving the combustibility of the tobacco leaves.

[0049] Table 4. Results of the effect of synergist on the normalized value of ash size and the potassium, calcium and magnesium content of tobacco leaves.

[0050] Note: In the table, the same letter indicates no significant difference, and different letters indicate a significant difference. P <0.05) As shown in Table 4 above, soaking in the mixed solution for 1 day significantly reduced the normalized value of tobacco ash, causing the ash to develop towards a whiter color, and correspondingly significantly increased the potassium, calcium and magnesium content in the tobacco leaves.

[0051] Experimental Example 2 An experiment was conducted in Fengcheng Town, Xuanhan County, Dazhou City, Sichuan Province. Specifically, the field experiment was carried out in Fengcheng Town, Xuanhan County from April to July 2025. In March, the land was prepared and ridges were made before planting. The ridges were 1.1m wide. Before ridging, 750kg / hm² of tobacco-specific compound fertilizer (12-12-25) was applied in strips. 2 150 kg / hm² of superphosphate 2 1500 kg / hm of decomposed oil cake 2 The fertilizer was evenly mixed, and after ridging, the seedlings were covered with mulch. In April, when transplanting the tobacco seedlings, holes were dug, the seedlings were transplanted, and watered. The transplanting density was 110cm × 40cm, with 1450 plants per mu (approximately 667 square meters). The tested variety was Chuanxue No. 4. 45 days after transplanting, the mulch was removed, soil was mounded around the seedbed, and 150 kg / hm² of tobacco-specific compound fertilizer (12-12-25) was applied. 2 And special top dressing (13-0-46) 300kg / hm 2 In July, mature tobacco leaf samples from different regions were collected. The petiole ends of the raw tobacco leaves were cut into wedge shapes with a blade, and then subjected to a solution immersion culture experiment. The solution immersion culture experiment had two treatments: immersion in distilled water (control group) and immersion in a mixed solution of 5% potassium dihydrogen phosphate, 6% calcium nitrate, and 7% magnesium nitrate (experimental group). Each treatment was immersed for 1 day. After the culture was completed, the samples were taken and dried according to the cigar drying method.

[0052] Cigar tobacco samples that had been soaked in the solution and then dried were selected. The normalized value of ash hue, potassium content, calcium content, and magnesium content of the tobacco leaves were determined according to the method in Example 1. Two tobacco strips, 1 cm wide and 5 cm long, were cut from the middle of each leaf along both sides of the midrib, resulting in four strips per leaf. A temperature-controlled electric furnace was used to control the ignition temperature at approximately 540℃. After the furnace temperature stabilized, a stopwatch was used to time the process. The tobacco strip was held in contact with the furnace wire with tweezers for 3 seconds, then removed (i.e., the tobacco strip was ignited). The stopwatch was started again simultaneously to observe the smoldering time without a flame. Timing was stopped when the last spark extinguished; this time was recorded as the smoldering time of that tobacco strip. The average of the four tobacco strips was taken as the corresponding smoldering time. Simultaneously, the length of the remaining tobacco strips was measured. The area of ​​the burning tobacco strip was divided by the smoldering time to obtain the area of ​​tobacco leaf burned per unit time, which is the combustion rate. The test results are shown in Table 5. Figure 1 .

[0053] Table 5. Test results of cigar combustibility in Xuanhan County, Dazhou City, Sichuan Province

[0054] Note: In the table, the same letter indicates no significant difference, and different letters indicate a significant difference. P <0.05).

[0055] According to Table 5 and Figure 1 As can be seen, the average gray color normalization value of the tobacco leaves in the control group was 0.82, and the average burning speed was 0.12 cm. 2 The average smoldering time was 4.46 s. The average normalized ash value of the tobacco leaves in the experimental group was 0.74, and the average burning speed was 0.11 cm / s. 2 The average smoldering time was 5.84 s. The normalized ash value of the experimental group was significantly lower than that of the control group, while the smoldering time of the experimental group was significantly higher than that of the control group. However, there was no significant change in the combustion rate between the two groups. The potassium, calcium, and magnesium content of the experimental group was also significantly higher than that of the control group. Treating tobacco leaves with the synergist of this invention can significantly prolong the smoldering time of tobacco leaves, significantly reduce the ash value, whiten the ash color, and significantly increase the potassium, calcium, and magnesium content of tobacco leaves.

[0056] Experimental Example 3 An experiment was conducted in Shigu Town, Shifang City, Deyang City, Sichuan Province (longitude: 104°5'11'E, latitude: 31°10'57'N). Specifically, the field experiment was conducted in Shifang City, Deyang City from April to July 2025. In March, the land was prepared and ridges were made before planting, with a ridge width of 1.1m. Before ridging, 750kg / hm² of tobacco-specific compound fertilizer (10-15-25) was applied in strips. 2 750 kg / hm² of commercial organic fertilizer 2 750 kg / hm of decomposed oil cake2 The fertilizer was evenly mixed, and after ridging, the seedlings were covered with mulch. In April, when transplanting the tobacco seedlings, holes were dug, the seedlings were transplanted, and watered. The transplanting density was 110cm × 38cm, with 1600 plants per mu (approximately 667 square meters). The tested variety was Dexue No. 4. 39 days after transplanting, the mulch was removed, soil was mounded around the seedbed, and tobacco-specific topdressing fertilizer (13-0-46) at 375 kg / hm² was applied. 2 Other cultivation and management practices were carried out in accordance with local high-quality tobacco production methods. Mature mid-section tobacco leaf samples were collected in July. The petiole ends of the green tobacco leaves were cut into wedge shapes with a blade, and then subjected to a solution immersion culture experiment. The solution immersion culture experiment included two treatments: immersion in distilled water (control group) and immersion in a mixed solution of 5% potassium dihydrogen phosphate, 6% calcium nitrate, and 7% magnesium nitrate (experimental group). Each treatment was immersed for one day. After the culture period, samples were taken and dried according to cigar drying methods.

[0057] Cigar tobacco samples that had been soaked and dried in the solution were selected, and the normalized ash value, smoldering time, and burning rate were determined according to the method in Example 2. The test results are shown in Table 6 and... Figure 2 As shown.

[0058] Table 6. Test results of flammability of cigars in Shifang City, Deyang City, Sichuan Province

[0059] Note: In the table, the same letter indicates no significant difference, and different letters indicate a significant difference. P <0.05) According to Table 6 and Figure 2 As can be seen, the average gray color normalization value of the tobacco leaves in the control group was 0.86, and the average burning speed was 0.14 cm. 2 The average smoldering time was 3.33 s. The average normalized ash value of the tobacco leaves in the experimental group was 0.70, and the average burning speed was 0.11 cm / s. 2 The average smoldering time was 5.93 s. The normalized ash value of the tobacco leaves in the experimental group was significantly lower than that in the control group, and the combustion rate of the experimental group was also significantly lower than that of the control group, while the smoldering time of the experimental group was significantly higher than that of the control group. Treating tobacco leaves with the method of this invention can significantly prolong the smoldering time of tobacco leaves, slow down the combustion rate, significantly reduce the ash value, and whiten the ash color.

[0060] 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 principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for improving the combustibility and ash color of cigar tobacco leaves, characterized in that, The method includes the following steps: Harvest naturally matured fresh tobacco leaves, cut the petiole end of the tobacco leaves into a wedge shape, and soak the petiole in the compound synergist mother liquor for 1-2 days; The raw tobacco leaves after soaking the stem are dried to obtain cigar tobacco leaves.

2. The method according to claim 1, characterized in that, The composite synergist mother liquor contains, by mass percentage, 5-8% water-soluble potassium salt, 6-9% water-soluble calcium salt and 7-10% water-soluble magnesium salt.

3. The method according to claim 2, characterized in that, The water-soluble potassium salt is potassium dihydrogen phosphate or potassium nitrate; the water-soluble calcium salt is calcium nitrate; and the water-soluble magnesium salt is magnesium nitrate, magnesium sulfate, or chelated magnesium.

4. The method according to claim 1, characterized in that, The total drying time for the raw tobacco leaves is 24-33 days.

5. Cigar tobacco leaves prepared by the method according to any one of claims 1-4.

6. The use of the cigar tobacco leaf according to claim 5 in the preparation of cigars.

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