On-line perfuming process for heated cigarette reconstituted tobacco

Abstract

The invention discloses an online perfuming process for heated cigarette reconstituted tobacco, and belongs to the technical field of tobaccos, and the preparation of the heated cigarette reconstituted tobacco comprises the steps of tobacco raw material mixing, powder making, thick slurry preparation, forming, first-stage drying, second-stage drying and post-treatment. The flavors and fragrances in the formula are classified, and different adding points and different cleaning agents and cleaning modes are selected, so that the adding amount and uniform distribution of the flavors in the reconstituted tobacco are ensured, the quality and quality stability of heated cigarette products are ensured, the consumption of alcohol cleaning agents is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of tobacco, and particularly to an on-line flavoring process for reconstituted tobacco in heated cigarettes. Background Art

[0002] Heated cigarettes are a new type of tobacco product. They heat the tobacco core material through an external heat source, causing the atomization medium, flavor components, and added flavor in the tobacco core material to volatilize and produce smoke similar to that of traditional cigarettes when burned. Compared with traditional cigarettes, the reduction of most harmful components in the smoke of heated cigarettes reaches more than 90%. Reconstituted tobacco, also known as tobacco sheet, is the most commonly used tobacco core material for heated cigarettes.

[0003] Heated cigarettes face numerous markets internationally and have a large difference in consumer groups. The global demand for products with multiple flavors and new specifications is relatively strong, and the development and design of heated cigarette products with different flavors have attracted much attention. The realization of different flavors in heated cigarettes is mainly achieved through the addition of flavor. In the prior art, disordered heated cigarettes often adopt an off-line flavoring method, which flavors the reconstituted tobacco after the production of the reconstituted tobacco is completed and before it is rolled on the cigarette-making machine; the flavoring of ordered heated cigarettes is usually completed during the rolling stage of the reconstituted tobacco. Limited by the flavor diffusion time after flavoring, when the required flavoring ratio of the product is large, the flavor temperature is too low, or there are some insoluble solid particles in the flavor, it is extremely easy to cause excessive local flavor, and the flavor cannot be fully absorbed by the reconstituted tobacco inside the cigarette paper, but penetrates to the surface of the cigarette, forming yellow spots, resulting in serious quality defects in heated cigarette products. Because some essence and flavor are insoluble or poorly soluble in water, the existing heated cigarette flavor addition system needs to use alcohol solvents such as ethanol for cleaning, resulting in increased equipment investment and increased cleaning agent cost input.

[0004] Patent CN118476644A discloses a heated cigarette and an optimization method for its flavoring method, which proposes to compare the key thermal decomposition temperature points of monomeric flavors with the actual heating temperature of the cigarette rod in the smoking device, and select the flavoring method of bursting beads, filter rod or sheet according to the comparison results. The main focus of this invention is to provide a solution for obtaining a more objective flavoring method for heated cigarette rods through accurate thermogravimetric data analysis. It is proposed that when the temperature at the maximum weight loss rate of the monomeric flavor is greater than the high preset temperature, the sheet flavoring method is selected, but it is not clear whether the sheet flavoring is carried out in the sheet production and processing link or in the sheet winding link on the machine, nor is the specific process of sheet flavoring mentioned. Patent CN116616480A discloses a flavoring method for a heat-not-burn cigarette, which proposes to mix tobacco raw materials with flavoring agents and water to obtain a tobacco solid, and prepare a heat-not-burn cigarette core material containing flavoring agents through a forming device. This invention does not clarify whether the heat-not-burn cigarette core material is tobacco particles or tobacco sheets. In the actual production process, when the flavoring agents are mixed with water and tobacco raw materials, some flavoring agents that are difficult to dissolve or insoluble in water will precipitate, resulting in a large amount of colloidal and flocculent insoluble substances in the tobacco solid. These insoluble substances are difficult to eliminate through methods such as grinding and screening, and may even cause wall hanging of the tank body and pipeline, blockage of the pipeline and pump body, increasing the difficulty of production operation and control, and it is difficult to ensure the sensory quality of the product. Summary of the Invention

[0005] In view of the above, the present invention aims to provide an on-line flavoring process for reconstituted tobacco of heated cigarettes, moving the flavoring point of heated cigarettes forward to the production and processing link of reconstituted tobacco. According to the differences in the decomposition temperature and solubility of flavoring agents, the flavoring agents in the formula are classified and added to different production processes of reconstituted tobacco respectively, so as to solve the problems such as limited flavoring amount, uneven application of spices, excessive local spices, inability of the spices to be fully absorbed by the reconstituted tobacco inside the cigarette paper and penetrate to the surface of the cigarette, and precipitation of colloidal and flocculent insoluble substances formed by the spices when encountering water, resulting in unstable product quality and serious quality defects in the existing flavoring methods.

[0006] Based on the above purpose, the technical solution adopted by the present invention is as follows: An on-line flavoring process for reconstituted tobacco for heated cigarettes. The preparation of the reconstituted tobacco for heated cigarettes includes tobacco raw material blending, powder making, thick slurry preparation, forming, first-stage drying, second-stage drying, and post-treatment processes. According to the initial decomposition temperature and solubility differences of the flavorings, the flavorings in the formula are divided into six categories: high decomposition temperature water-soluble type, high decomposition temperature alcohol-soluble type, medium decomposition temperature water-soluble type, medium decomposition temperature alcohol-soluble type, low decomposition temperature water-soluble type, and low decomposition temperature alcohol-soluble type. After classification, the flavorings are added from three addition points respectively. The first addition point is the thick slurry preparation process, the second addition point is the outlet of the first-stage drying process, and the third addition point is the outlet of the second-stage drying process. The high decomposition temperature water-soluble flavorings are added in the thick slurry preparation process (the first addition point), the high decomposition temperature alcohol-soluble type, medium decomposition temperature water-soluble type, and medium decomposition temperature alcohol-soluble type flavorings are added at the outlet of the first-stage drying process (the second addition point), and the low decomposition temperature water-soluble type and low decomposition temperature alcohol-soluble type flavorings are added at the outlet of the second-stage drying process (the third addition point). The addition ratio of the flavorings in the thick slurry preparation process is (1-8) wt%, and the addition amount of the flavorings at the outlet of the first-stage drying process is (1-4.5) g / m 2 , and the addition amount of the flavorings at the outlet of the second-stage drying process is (1-4.5) g / m 2 .

[0007] In the present invention, according to the initial decomposition temperature and solubility differences of the flavorings, the flavorings in the formula are classified, and different addition points, different cleaning agents, and cleaning methods are selected, which ensures the addition amount and uniform distribution of the flavorings in the reconstituted tobacco, ensures the product quality and quality stability of the heated cigarettes, reduces the consumption of alcohol-based cleaning agents, and reduces the production cost.

[0008] Specifically, the processing process of the reconstituted tobacco for heated cigarettes adopts one of the thick slurry method and the thick slurry papermaking composite method.

[0009] Preferably, the main processing procedures of the reconstituted tobacco for heated cigarettes by the thick slurry method are successively: tobacco raw material blending, powder making, thick slurry preparation, casting forming, first-stage drying, second-stage drying, cutting, boxing and packing.

[0010] Preferably, the main processing procedures of the reconstituted tobacco for heated cigarettes by the thick slurry papermaking composite method are successively: tobacco raw material blending, powder making, thick slurry preparation, base paper and thick slurry composite forming, first-stage drying, second-stage drying, winding, slitting, and packaging.

[0011] Calculated by mass parts, the thick slurry for the reconstituted tobacco for heated cigarettes by the thick slurry method is composed of 100 parts of tobacco powder, 10-25 parts of smoking agent, 1-6 parts of binder, 2-10 parts of wood pulp fiber, and 350-500 parts of water, and the mesh number of the tobacco powder is 150-350 meshes.

[0012] Preferably, in parts by mass, the thick slurry for the reconstituted tobacco for heated cigarettes by the thick slurry papermaking composite method is composed of 100 parts of tobacco powder, 15 - 30 parts of a smoking agent, 1 - 6 parts of an adhesive, 2 - 4 parts of wood pulp fiber, and 300 - 350 parts of water. The mesh number of the tobacco powder is 300 - 500 meshes. Specifically, the smoking agent is one or a mixture of glycerol and propylene glycol in any proportion, and the adhesive is one or a mixture of sodium carboxymethyl cellulose, guar gum, hydroxypropyl methylcellulose, and methylcellulose in any proportion.

[0013] Specifically, the absolute dry basis grammage of the reconstituted tobacco for heated cigarettes by the thick slurry method is (130 - 150) g / m 2 , and the absolute dry basis grammage of the reconstituted tobacco for heated cigarettes by the thick slurry papermaking composite method is (130 - 180) g / m 2 .

[0014] Preferably, the starting decomposition temperature of the flavor and fragrance with a high decomposition temperature > 120 °C, the starting decomposition temperature of the flavor and fragrance with a medium decomposition temperature is greater than or equal to 80 °C and less than or equal to 120 °C, and the starting decomposition temperature of the flavor and fragrance with a low decomposition temperature < 80 °C.

[0015] Among them, the drying temperature of the first drying process is 80 - 115 °C, and the drying temperature of the second drying process is 40 - 65 °C. Specifically, the water-soluble flavor and fragrance with a high decomposition temperature are mixed with the tobacco powder, water, adhesive, smoking agent, additional fiber, etc. that make up the thick slurry in the thick slurry configuration tank. On the one hand, it avoids the formation of insoluble precipitates when the flavor and fragrance encounter water. On the other hand, a high-speed stirring device is provided in the thick slurry configuration tank, with a rotation speed of 1000 - 2000 r / min. A shear pump is provided at the outlet of the thick slurry configuration tank. The flavor and fragrance and the thick slurry are fully mixed under the action of the high-speed stirring device, and at the same time, they are returned to the thick slurry configuration tank under the pumping of the shear pump to achieve continuous cyclic mixing, ensuring that the flavor and fragrance are evenly distributed in the thick slurry.

[0016] Specifically, the addition method of the flavor and fragrance at the second addition point and the third addition point is any one of spraying, film transfer coating, slot coating, and casting coating.

[0017] Specifically, the water-soluble flavor and fragrance with a high decomposition temperature, the water-soluble flavor and fragrance with a medium decomposition temperature, and the water-soluble flavor and fragrance with a low decomposition temperature are cleaned with clean water at normal temperature (20 - 25 °C) and normal pressure (1 - 3.5 bar). The alcohol-soluble flavor and fragrance with a high decomposition temperature, the alcohol-soluble flavor and fragrance with a medium decomposition temperature, and the alcohol-soluble flavor and fragrance with a low decomposition temperature are cleaned with an ethanol solution with a concentration of (75 - 95) v%.

[0018] Preferably, the high decomposition temperature alcohol-soluble, medium decomposition temperature water-soluble, medium decomposition temperature alcohol-soluble, low decomposition temperature water-soluble, and low decomposition temperature alcohol-soluble flavoring agents are added by a flavoring agent addition system, which consists of a flavoring agent temporary storage tank, a first transfer pump, a flavoring agent working tank, a second transfer pump, a mass flow meter, and a spraying or coating device connected in sequence through pipelines.

[0019] Specifically, the flavoring agent addition systems for high decomposition temperature alcohol-soluble, medium decomposition temperature alcohol-soluble, and low decomposition temperature alcohol-soluble flavoring agents are designed to be detachable. After production, the flavoring agent addition systems are disassembled and transferred to an outdoor open environment for cleaning, avoiding potential safety hazards caused by cleaning in the workshop.

[0020] Generally speaking, the present invention has the following advantages: 1. The present invention proposes an online flavoring process for reconstituted tobacco for heated cigarettes, moving the flavoring point of heated cigarettes forward to the production and processing link of reconstituted tobacco, providing sufficient diffusion and penetration time for the formulated flavoring agents, improving the uniformity of the addition of the formulated flavoring agents, enabling the addition of a relatively large proportion of flavoring agents according to product requirements, and solving problems such as limited flavoring amount, uneven application of flavoring agents, excessive local flavoring agents, and the inability of the flavoring agents to be fully absorbed by the reconstituted tobacco inside the cigarette paper and penetrate to the surface of the cigarette, resulting in serious quality defects under the existing flavoring methods.

[0021] 2. For the online flavoring process of reconstituted tobacco for heated cigarettes described in the present invention, the flavoring agents in the formula are classified according to the initial decomposition temperature and solubility differences of the flavoring agents in the formula. Combining the material composition and process parameters of each process in the production process of reconstituted tobacco, the classified flavoring agents are respectively added to the thick slurry preparation process, the outlet of the first drying process, and the outlet of the second drying process. The addition amounts of the flavoring agents at each addition point are independently controlled, improving the addition accuracy of the formulated flavoring agents, avoiding the formation of insoluble precipitates when the formulated flavoring agents are added at a single point in contact with water, and ensuring the product quality.

[0022] 3. For the online flavoring process of reconstituted tobacco for heated cigarettes described in the present invention, the formulated flavoring agents are classified into water-soluble and alcohol-soluble flavoring agents according to the solubility differences of the formulated flavoring agents. The water-soluble flavoring agents are cleaned with clean water, and the alcohol-soluble flavoring agent addition system is designed to be detachable and cleaned with an ethanol solution in an outdoor open environment. Compared with the traditional cleaning method using alcohol solutions, it reduces the consumption of alcohol cleaning reagents, lowers the production cost, and ensures the operation safety. Description of the Drawings

[0023] Figure 1 is the process flow diagram of the flavoring process for reconstituted tobacco for heated cigarettes by the thick slurry method; Figure 2 is the process flow of the flavoring process for reconstituted tobacco for heated cigarettes by the thick slurry papermaking composite method. Specific Embodiments

[0024] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] In the following embodiments, the essence and flavor at the outlet of the first-stage drying process and the outlet of the second-stage drying process are added by an essence and flavor addition system. The essence and flavor addition system consists of an essence and flavor temporary storage tank, a first transfer pump, an essence and flavor working tank, a second transfer pump, a mass flowmeter, and a spraying or coating device, which are connected in sequence through pipelines.

[0026] Example 1: An on-line flavoring process for reconstituted tobacco for heated cigarettes by the thick slurry method is as follows: Weigh a certain mass of Zimbabwe tobacco samples, mix them with hot water at 65 °C at a solid-liquid mass ratio of 1:6, stir and extract for 60 minutes, then separate the solid and liquid. The obtained liquid is concentrated to about 35 °Bé at 80 °C using a concentration evaporator to obtain a water extract of Zimbabwe tobacco (belonging to the water-soluble type with a high decomposition temperature). As Figure 1 shown, the formulated tobacco leaves are crushed into tobacco powder of 200 meshes. Take 100 parts of tobacco powder, 17 parts of glycerol, 3 parts of sodium carboxymethylcellulose, 4 parts of wood pulp fiber, 380 parts of water, and 4 wt% (compared to tobacco powder) of the water extract of Zimbabwe tobacco, and add them to the thick slurry preparation tank (i.e., the first essence and flavor addition point). Start the high-speed stirring device of the thick slurry preparation tank, set the rotation speed to 1500 r / min, stir for 20 minutes, then adjust the three-way valve on the shear pump pipeline to the direction of the thick slurry preparation tank, start the shear pump, pump the thick slurry to the thick slurry preparation tank, circulate and mix for 30 minutes, then adjust the three-way valve on the shear pump pipeline to the direction of the casting and forming process. The thick slurry is transported to the storage box through the shear pump, and then evenly spread on the upper surface of the steel belt. After being transported by the steel belt to the first-stage drying process, set the drying temperature of the first-stage drying process to 90 °C. After the thick slurry is dried in the first stage and peeled off from the steel plate, reconstituted tobacco is formed. The quantitative of the reconstituted tobacco is 140 g / m 2 , the reconstituted tobacco enters the second essence and flavor addition point, and menthol dissolved in 95 v% ethanol is added to the upper surface of the reconstituted tobacco by the slit coating method. The concentration of menthol (belonging to the alcohol-soluble type with a high decomposition temperature) is 60 wt%, and the addition amount is 4 g / m 2 , the reconstituted tobacco after slit coating enters the second-stage drying process under the belt conveyor, set the drying temperature of the second-stage drying process to 55 °C. The reconstituted tobacco after the second-stage drying enters the third essence and flavor addition point, and ethyl acetate diluted with 75 v% ethanol is applied to the upper surface of the reconstituted tobacco by the spraying method. The concentration of ethyl acetate (belonging to the alcohol-soluble type with a low decomposition temperature) is 40 wt%, and the addition amount is 1.5 g / m 2, the reconstituted tobacco sprayed with flavorings is shredded, packed in boxes, and made into the finished product of reconstituted tobacco for heat-not-burn cigarettes by the thick slurry method. The finished product of reconstituted tobacco for heat-not-burn cigarettes by the thick slurry method is transported to the rolling process, and heat-not-burn cigarette cartridges are rolled on a cigarette machine. After the production is completed, the menthol and ethyl acetate addition systems are disassembled and transferred to the outdoor open environment for cleaning. The water-soluble flavorings with high decomposition temperature, medium decomposition temperature, and low decomposition temperature are cleaned with water at normal temperature and pressure, and the alcohol-soluble flavorings with high decomposition temperature, medium decomposition temperature, and low decomposition temperature are cleaned with an ethanol solution with a concentration of 75v%.

[0027] Comparative Example 1: Weigh a certain mass of Zimbabwe tobacco samples, mix them with hot water at 65 °C at a solid-liquid mass ratio of 1:6, stir and extract for 60 min, then separate the solid and liquid. The obtained liquid is concentrated to about 35 °Bé at 80 °C using a concentration evaporator to obtain the water extract of Zimbabwe tobacco. The formulated tobacco is crushed into tobacco powder of 200 meshes. Take 100 parts of tobacco powder, 17 parts of glycerol, 3 parts of sodium carboxymethylcellulose, 4 parts of wood pulp fiber, 380 parts of water, 4 wt% (compared to the tobacco powder) of the water extract of Zimbabwe tobacco, 3.5 wt% (compared to the tobacco powder) of menthol (menthol is pre-dissolved in 95v% ethanol, and the concentration of menthol after dissolution is 60 wt%), and 1.3 wt% (compared to the tobacco powder) of ethyl acetate (ethyl acetate is pre-dissolved in 75v% ethanol, and the concentration of ethyl acetate after dissolution is 40 wt%), add them to the thick slurry preparation tank, start the stirring device of the thick slurry preparation tank, set the rotation speed to 300 r / min, stir for 40 min, then start the screw pump at the outlet of the thick slurry preparation tank. The thick slurry is transported to the storage box through the screw pump, and then evenly spread on the upper surface of the steel belt. It is transported by the steel belt to the first drying process. Set the drying temperature of the first drying process to 90 °C. After the thick slurry is dried in the first drying process and peeled off from the steel plate, reconstituted tobacco is formed. The quantitative of the reconstituted tobacco is 140 g / m 2 , the reconstituted tobacco enters the second drying process under the conveying of the mesh belt. Set the drying temperature of the second drying process to 55 °C. The reconstituted tobacco after the second drying process is shredded, packed in boxes, and made into the finished product of reconstituted tobacco for heat-not-burn cigarettes by the thick slurry method. The finished product of reconstituted tobacco for heat-not-burn cigarettes by the thick slurry method is transported to the rolling process, and heat-not-burn cigarette cartridges are rolled on a cigarette machine. Select the heat-not-burn cigarette cartridge samples prepared in Comparative Example 1 and Example 1 for sensory quality evaluation. The results are shown in Table 1.

[0028] Table 1 Sensory quality evaluation of the finished product of reconstituted tobacco for heat-not-burn cigarettes by the thick slurry method Note: Based on the added mass of the tobacco powder, the addition amounts of the water extract of Zimbabwe tobacco, menthol, and ethyl acetate in the reconstituted tobacco samples for heat-not-burn cigarettes by the thick slurry method in Comparative Example 1 and Example 1 are the same.

[0029] As can be seen from Table 1, compared with the heat-not-burn tobacco cartridge sample without segmented flavoring in Comparative Example 1, the heat-not-burn tobacco cartridge sample with flavoring in three segments during the production process of the reconstituted tobacco in Specific Example 1 has significantly improved aroma quality and aroma quantity.

[0030] Example 2: An on-line flavoring process for heat-not-burn reconstituted tobacco by thick slurry papermaking composite method is as follows: Weigh a certain mass of Virginia tobacco leaf sample, mix it with hot water at 65 °C at a solid-liquid mass ratio of 1:6, stir and extract for 60 min, then separate the solid and liquid. The obtained liquid is concentrated to about 35 °Bé at 80 °C using a concentrator evaporator to obtain Virginia tobacco leaf aqueous extract (belonging to the water-soluble type with high decomposition temperature). As Figure 2 shown, the formulated tobacco leaves are crushed into tobacco powder of 400 mesh. Take 100 parts of tobacco powder, 23 parts of glycerol, 3 parts of sodium carboxymethylcellulose, 2 parts of wood pulp fiber, 320 parts of water, and 4 wt% (compared with tobacco powder) of Virginia tobacco leaf aqueous extract, and add them to the thick slurry preparation tank (i.e., the first flavoring agent addition point). Start the high-speed stirring device of the thick slurry preparation tank, set the rotation speed to 1800 r / min, stir for 20 min, then adjust the three-way valve on the shear pump pipeline to the direction of the thick slurry preparation tank, start the shear pump, pump the thick slurry to the thick slurry preparation tank, circulate and mix for 30 min, then adjust the three-way valve on the shear pump pipeline to the direction of the casting and forming process. The thick slurry is transported to the storage box via the shear pump, then evenly spread on the upper surface of the steel belt, and then a base paper with a basis weight of 22 g / m 2 and air permeability of 11000 μm / (pa·s) is laid on the upper surface of the thick slurry to achieve the composite forming of the base paper and the thick slurry. Then it is transported to the first-stage drying process via the steel belt. Set the drying temperature of the first-stage drying process to 95 °C. After the thick slurry is dried in the first stage and peeled off from the steel plate, reconstituted tobacco is formed. The basis weight of the reconstituted tobacco is 170 g / m 2 , and the reconstituted tobacco enters the second flavoring agent addition point. 3,4-Methylenedioxybenzaldehyde (belonging to the alcohol-soluble type with high decomposition temperature) dissolved in 75 v% ethanol is added to the upper surface of the reconstituted tobacco by slit coating. The concentration of 3,4-methylenedioxybenzaldehyde is 20 wt%, and the addition amount is 2.5 g / m 2 . After slit coating, the reconstituted tobacco enters the second-stage drying process under the transportation of the mesh belt. Set the drying temperature of the second-stage drying process to 55 °C. After the reconstituted tobacco is dried in the second stage, it enters the third flavoring agent addition point. Ethyl acetate diluted with 75 v% ethanol is applied to the upper surface of the reconstituted tobacco by spraying. The concentration of ethyl acetate is 40 wt% and the addition amount is 1.5 g / m 2, the reconstituted tobacco sprayed with flavorings is wound, slit, and packaged to form the finished product of the thick slurry papermaking composite method for heated cigarette reconstituted tobacco. The finished product of the thick slurry papermaking composite method for heated cigarette reconstituted tobacco is transported to the rolling process, where it is indented, gathered, and rolled on a cigarette machine to obtain a heated cigarette cartridge. After the production is completed, the 3,4-methylenedioxybenzaldehyde and ethyl acetate addition systems are disassembled and transferred to the outdoor open environment for cleaning. The high decomposition temperature water-soluble, medium decomposition temperature water-soluble, and low decomposition temperature water-soluble flavorings are cleaned with normal temperature and atmospheric pressure clean water, and the high decomposition temperature alcohol-soluble, medium decomposition temperature alcohol-soluble, and low decomposition temperature alcohol-soluble flavorings are cleaned with an ethanol solution with a concentration of 75v%.

[0031] Comparative Example 2: Weigh a certain mass of Virginia tobacco leaf samples, mix them with hot water at 65 °C at a solid-liquid mass ratio of 1:6, stir and extract for 60 min, then separate the solid and liquid. The obtained liquid is concentrated to about 35 °Bé at 80 °C using a concentrator-evaporator to obtain the water extract of Virginia tobacco leaves. The formulated tobacco leaves are ground into tobacco powder with a mesh size of 400. Take 100 parts of tobacco powder, 23 parts of glycerol, 3 parts of sodium carboxymethylcellulose, 2 parts of wood pulp fiber, and 320 parts of water, and add them to the thick slurry preparation tank. Start the stirring device of the thick slurry preparation tank, set the rotation speed to 300 r / min, stir for 40 min, then start the screw pump at the outlet of the thick slurry preparation tank. The thick slurry is transported to the storage box through the screw pump, and then evenly spread on the upper surface of the steel belt. Then, a base paper with a basis weight of 22 g / m 2 and an air permeability of 11000 μm / (pa·s) is laid on the upper surface of the thick slurry to achieve the composite molding of the base paper and the thick slurry. Then, it is transported by the steel belt to the first drying process. Set the drying temperature of the first drying process to 95 °C. After the thick slurry is dried in the first drying process and peeled off from the steel plate, reconstituted tobacco is formed. The reconstituted tobacco has a basis weight of 170 g / m 2 . The reconstituted tobacco enters the second drying process under the transportation of the mesh belt. Set the drying temperature of the second drying process to 55 °C. The reconstituted tobacco after the second drying process is wound, slit, and packaged to form the finished product of the thick slurry papermaking composite method for heated cigarette reconstituted tobacco. The finished product of the thick slurry papermaking composite method for heated cigarette reconstituted tobacco is transported to the rolling process. Before gathering after indenting on a cigarette machine, a mixture of the water extract of Virginia tobacco leaves, 3,4-methylenedioxybenzaldehyde, and ethyl acetate is applied by spraying. Among them, 3,4-methylenedioxybenzaldehyde and ethyl acetate are pre-dissolved and diluted with 75v% ethanol. The addition amount of the water extract of Virginia tobacco leaves is 5.3 g / m 2 , the concentration of 3,4-methylenedioxybenzaldehyde is 20 wt%, and the addition amount is 2.5 g / m 2 , the concentration of ethyl acetate is 40 wt% and the addition amount is 1.5 g / m 2 . The flavored reconstituted tobacco is rolled on a cigarette machine to obtain a heated cigarette cartridge.

[0032] Select the heated cigarette cartridge samples prepared in Comparative Example 2 and Example 2, and detect the proportion of oil-spotted cigarettes in each sample. The results are shown in Table 2.

[0033] Table 2 Proportion of oil-spotted cigarettes in heated cigarette cartridges Note: Based on the mass of the tobacco powder added, the addition amounts of the aqueous extract of Virginia tobacco leaves, 3,4-methylenedioxybenzaldehyde, and ethyl acetate in the reconstituted tobacco samples for heated cigarettes prepared by the thick pulp papermaking composite method in Comparative Example 2 and Example 2 are the same.

[0034] As can be seen from Table 2, the proportion of oil-spotted cigarettes in the heated cigarette cartridge sample with flavor addition in the rolling process in Comparative Example 2 is 10%, while no oil-spotted cigarettes are found in the heated cigarette cartridge sample with flavor addition in three stages during the processing of the reconstituted tobacco in Example 2.

Claims

1. A process for adding flavor to heated reconstituted tobacco leaves online, characterized in that: The preparation of the heated cigarette reconstituted tobacco includes tobacco raw material mixing, powdering, thick slurry preparation, molding, first stage drying, second stage drying, and post-processing steps. According to the difference in the initial decomposition temperature and solubility performance of flavors and spices, the flavors and spices in the formula are divided into high decomposition temperature water-soluble type, high decomposition temperature alcohol-soluble type, medium decomposition temperature water-soluble type, medium decomposition temperature alcohol-soluble type, low decomposition temperature water-soluble type and low decomposition temperature alcohol-soluble type. The high decomposition temperature water-soluble flavors and spices are added in the thick slurry preparation step, the high decomposition temperature alcohol-soluble type, medium decomposition temperature water-soluble type and medium decomposition temperature alcohol-soluble flavors and spices are added at the outlet of the first stage drying step, the low decomposition temperature water-soluble type and low decomposition temperature alcohol-soluble flavors and spices are added at the outlet of the second stage drying step, the addition ratio of flavors and spices in the thick slurry preparation step is (1-8) wt%, and the addition amount of flavors and spices at the outlet of the first stage drying step is (1-4.5) g / m 2 The amount of flavors and fragrances added at the outlet of the second drying process is (1~4.5) g / m 2 .

2. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 1, characterized in that: The heated cigarette reconstituted tobacco leaf adopts a thick pulp method or a thick pulp papermaking composite method processing technology. The thick pulp method heated cigarette reconstituted tobacco leaf adopts cast molding when forming, and is cut into shreds and packed into boxes in the post-processing process; the thick pulp papermaking composite method heated cigarette reconstituted tobacco leaf adopts base paper and thick pulp composite molding when forming, and is rolled, cut and packaged in the post-processing process.

3. The process for online flavoring of heated reconstituted tobacco leaves for cigarettes according to claim 2, characterized in that: Calculated by weight, the thick slurry of the reconstituted tobacco leaves heated by the thick slurry method for cigarettes consists of 100 parts of tobacco powder, 10 to 25 parts of smoke-generating agents, 1 to 6 parts of adhesives, 2 to 10 parts of wood pulp fibers, and 350 to 500 parts of water, and the mesh size of the tobacco powder is 150 to 350 meshes.

4. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 2, characterized in that: Calculated by weight, the thick pulp slurry of the thick pulp papermaking composite method for heating cigarette reconstituted tobacco consists of 100 parts of tobacco powder, 15-30 parts of smoke-generating agents, 1-6 parts of adhesives, 2-4 parts of wood pulp fibers, and 300-350 parts of water, and the mesh size of the tobacco powder is 300-500 meshes.

5. The process for online flavoring of heated reconstituted tobacco leaves for cigarettes according to claim 3 or 4, characterized in that: The smoke generating agent is one of glycerol and propylene glycol or a mixture of two of them in any proportion, and the binder is one of sodium carboxymethyl cellulose, guar gum, hydroxypropyl methyl cellulose and methyl cellulose or a mixture of two or more of them in any proportion.

6. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 2, characterized in that: The absolute dry weight of the reconstituted tobacco leaves heated by the thick pulp method is (130-150) g / m 2 The absolute dry weight of the reconstituted tobacco leaves heated by the thick pulp papermaking composite method is (130-180) g / m 2 .

7. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 1, characterized in that: The initial decomposition temperature of flavors and fragrances with high decomposition temperatures is greater than 120°C, the initial decomposition temperature of flavors and fragrances with medium decomposition temperatures is greater than or equal to 80°C and less than or equal to 120°C, and the initial decomposition temperature of flavors and fragrances with low decomposition temperatures is less than 80°C.

8. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 1, characterized in that: The drying temperature of the first drying process is 80~115℃, and the drying temperature of the second drying process is 40~65℃.

9. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 1, characterized in that: The flavors and fragrances at the outlet of the first drying process and the outlet of the second drying process are added by the flavor and fragrance adding system, which is composed of a flavor and fragrance temporary storage tank, a first delivery pump, a flavor and fragrance working tank, a second delivery pump, a mass flow meter, and a spraying or coating device that are sequentially connected through pipelines.

10. The process for adding flavor to heated reconstituted tobacco leaves for cigarettes according to claim 1, characterized in that: High decomposition temperature water-soluble, medium decomposition temperature water-soluble, and low decomposition temperature water-soluble flavors and fragrances are cleaned with clean water at room temperature (20~25℃) and normal pressure (1~3.5bar). High decomposition temperature alcohol-soluble, medium decomposition temperature alcohol-soluble, and low decomposition temperature alcohol-soluble flavors and fragrances are cleaned with (75~95)v% concentration ethanol solution.

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