Production process for heating cigarette reconstituted tobacco by thick slurry method with high smoke agent retention rate

Abstract

The invention discloses a thick slurry method heating cigarette reconstituted tobacco production process with a high smoke agent retention rate, which comprises the following steps: according to different boiling points of smoke agents, adding the smoke agents in a classified and segmented manner, and adding the smoke agents with the boiling points greater than or equal to 250 DEG C in a thick slurry preparation link; smoking agents with the boiling point smaller than 250 DEG C are added at an outlet of the first drying section and an inlet of the second drying section, the temperatures of the first drying section, the second drying section and the third drying section are controlled below 80 DEG C, 60 DEG C and 50 DEG C respectively according to the low-temperature slow drying principle by adopting a three-section grading drying technology, and smoke agent detection devices are arranged at outlets of the first drying section, the second drying section and the third drying section respectively. The smoke agent retention rate in the reconstituted tobacco at each drying section outlet is detected on line in real time, the reconstituted tobacco smoke agent retention rate and the equipment operation parameters of each drying section are set in a linkage mode through PID, automatic regulation and control of the reconstituted tobacco smoke agent retention rate are achieved, the smoke agent content in the reconstituted tobacco finished product is ensured, and the quality of the reconstituted tobacco finished product is improved. And the quality of cigarette reconstituted tobacco products heated by the thick slurry method is improved.

Description

Technical Field

[0001] The present invention relates to the field of tobacco preparation, and particularly to a production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high retention rate of the aerosol-forming agent. Background Art

[0002] Heated cigarettes, also known as low-temperature cigarettes, do not burn tobacco by an open flame. Instead, they use electric heating or the heat of charcoal combustion flue gas to heat the tobacco matrix, so that the atomization medium, flavor components, and added fragrance in the tobacco matrix volatilize to produce smoke similar to that of traditional cigarettes during combustion, enabling consumers to achieve the same physiological satisfaction as when smoking traditional cigarettes by combustion and releasing fewer harmful substances, thus being favored by consumers.

[0003] The production process of reconstituted tobacco for heated cigarettes by the thick slurry method mainly involves crushing tobacco raw materials into powder, mixing them with an aerosol-forming agent, an adhesive, and fibers to form a thick slurry, and then obtaining a homogeneous reconstituted tobacco product for heated cigarettes through casting forming and drying. Among them, the aerosol-forming agent in the thick slurry can ensure that sufficient smoke volume is generated during the heating of the heated cigarette by an external heat source. It is also called an atomizing agent or an aerosol-forming agent. The main types of aerosol-forming agents are monohydric, dihydric, and polyhydric alcohols, etc., and 1,2-propanediol and glycerol are the most widely used. During the production and processing of reconstituted tobacco for heated cigarettes by the thick slurry method, the solid content of the thick slurry is about 25% (water content 75%). To ensure that the water content of the reconstituted tobacco finished product meets the product design requirements, it is necessary to control the moisture of the finished product at about (4 - 7)% by means of drying. During this process, if the drying temperature is too high and the drying intensity is too large, a large amount of 1,2-propanediol, glycerol, etc., especially low-boiling aerosol-forming agents, will volatilize and be lost, affecting the product quality. Some enterprises increase the addition ratio of the aerosol-forming agent to ensure the content of the aerosol-forming agent in the reconstituted tobacco finished product for heated cigarettes by the thick slurry method, increasing the production cost.

[0004] At the same time, during the processing of reconstituted tobacco for heated cigarettes by the thick slurry method, the retention rates of glycerol and 1,2-propanediol cannot be detected and regulated online. Usually, gas chromatography is used to offline detect the contents of glycerol and 1,2-propanediol in the reconstituted tobacco finished product for heated cigarettes prepared by the thick slurry method, and then the retention rates of glycerol and 1,2-propanediol are calculated. On the one hand, there is a lag in the feedback of the offline detection data; on the other hand, if the contents of glycerol and 1,2-propanediol in the finished product and the detection results of the retention rates are unqualified, it will lead to a batch of unqualified finished products, and the product quality and its stability cannot be guaranteed, and the product yield will also decrease. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the present invention proposes a production process for reconstituted tobacco for heated cigarettes by the thick slurry method with a high retention rate of smoke agent. The production process adopts three-stage classification drying, combined with on-line real-time detection and automatic control of the smoke agent content, to ensure the smoke agent content in the reconstituted tobacco at the outlet of each drying section; according to the different boiling points of each smoke agent, the smoke agents are classified and added in sections, avoiding a large amount of volatilization loss of the smoke agent during the drying process, improving the retention rate of the smoke agent in the product, and ensuring the product quality of the reconstituted tobacco for heated cigarettes by the thick slurry method.

[0006] According to the first aspect of the present invention, there is provided a production process for reconstituted tobacco for heated cigarettes by the thick slurry method with a high retention rate of smoke agent. The process flow chart is shown in Figure 1 。

[0007] It includes the following steps:

[0008] (1) Pump the thick slurry containing the first smoke agent into the slurry box, and evenly coat it on the running steel belt by the casting forming process; the thick slurry follows the steel belt into the first drying section, and after drying and peeling, reconstituted tobacco is formed. The temperature of the first drying section is ≤80 °C. A first smoke agent detection device and a first moisture content detection device are provided at the outlet of the first drying section. The first smoke agent detection device is used to detect the real-time value of the first smoke agent content and calculate the first retention rate of the first smoke agent;

[0009] (2) Convey the reconstituted tobacco in step (1) to the surface coating process through guide rollers, and coat the second smoke agent on the upper surface of the reconstituted tobacco;

[0010] (3) Convey the reconstituted tobacco after surface coating in step (2) into the second drying section along with the first mesh belt. The temperature of the second drying section is ≤60 °C. A second smoke agent detection device is provided at the outlet of the second drying section. The second smoke agent detection device is used to detect the real-time value of the second smoke agent content and calculate the first retention rate of the second smoke agent;

[0011] (4) The reconstituted tobacco after being dried in the second drying section is conveyed into a cutting machine along with the second mesh belt to obtain filamentous reconstituted tobacco;

[0012] (5) The filamentous reconstituted tobacco is conveyed to the first storage silo through the first vibrating trough, and after being temporarily stored in the first storage silo, it is conveyed to the third drying section at a flow rate of (100 - 150) kg / h. The temperature of the third drying section is ≤50 °C. A third smoke agent detection device and a second moisture content detection device are provided at the outlet of the third drying section. The third smoke agent detection device is used to detect the real-time values of the first smoke agent and the second smoke agent content, and calculate the second retention rate of the first smoke agent and the second retention rate of the second smoke agent;

[0013] (6) Convey the filamentary reconstituted tobacco leaves processed in the third drying section in step (5) to a weighing scale through a second vibrating trough for packing into boxes, thus obtaining a reconstituted tobacco leaf for heated cigarettes by the thick slurry method with a high retention rate of the smoke agent.

[0014] In step (1), the preparation of the thick slurry is prior art and not the inventive point of this application. Specifically, the thick slurry can be obtained through the following process:

[0015] (a) Grind tobacco raw materials composed of one or several of tobacco stems, tobacco dust, and tobacco leaves into tobacco powder, with the particle size of the tobacco powder being (200 - 500) mesh;

[0016] (b) Mix externally added fiber pulp, a first smoke agent, an adhesive, essence and spices, and water in a certain ratio to form a thick slurry material;

[0017] (c) Add the tobacco powder in step (a) to the thick slurry material in step (b) according to the ratio, and stir and mix evenly to form a thick slurry.

[0018] Specifically, the externally added fiber pulp in step (b) is one or a mixture of natural color softwood pulp and bleached softwood pulp in any proportion. The externally added fiber pulp is pre-beaten, the mass concentration of the externally added fiber pulp is (3 - 4)%, the beating degree of the externally added fiber pulp after beating is (50 - 60) °SR, and the wet weight is (3 - 6) g. The first smoke agent is glycerol with a boiling point ≥ 250 °C, etc. By mass, the thick slurry material consists of 50 - 180 parts of externally added fiber pulp, 15 - 23 parts of glycerol, 1 - 4 parts of adhesive, 150 - 310 parts of water, and 1.5 - 1.8 parts of essence and spices. The adhesive is one of non-ionic guar gum, sodium carboxymethyl cellulose, and xanthan gum.

[0019] Specifically, by mass, the thick slurry in step (c) consists of 100 parts of tobacco powder (dry weight) and 320 - 460 parts of thick slurry material. The mesh number of the tobacco powder is (300 - 500) mesh.

[0020] Preferably, in step (1), the slit gap between the casting mold and the steel belt is (0.50 - 0.90) mm, and the speed of the steel belt is (4 - 20) m / min.

[0021] Specifically, as Figure 2 shown, in the first drying section in step (1), hot air is used to dry the upper surface of the thick slurry, and steam is used to dry the lower surface of the thick slurry. According to the forward direction of the slurry, the first drying section includes two drying zones A and B.

[0022] There is a first air inlet at the upper part of drying zone A and a first steam pipeline at the bottom. The hot air flow direction is opposite to the direction of the thick slurry coated on the steel belt, reducing the drying intensity at the initial stage of drying and preventing the thick slurry on the upper surface of the steel belt from boiling rapidly, which may cause the formation of dense micropores in the thick slurry to form moisture and volatilization channels for the smoke agent.

[0023] The temperature of the first air inlet ≤ 70°C. The first steam pipeline is located at the bottom of the steel belt, and the surface temperature of the steel belt in drying zone A ≤ 70°C.

[0024] There are a second air inlet, a third air inlet, a fourth air inlet, a fifth air inlet, and a sixth air inlet at the upper part of drying zone B, and a second steam pipeline at the bottom. The hot air flow direction is perpendicular to the direction of the thick slurry coated on the steel belt. The temperatures of each air inlet are controlled separately. The temperature of the second air inlet ≤ 65°C, the temperatures of the third and fourth air inlets ≤ 70°C, and the temperatures of the fifth and sixth air inlets ≤ 80°C. The second steam pipeline is located at the bottom of the steel belt, and the surface temperature of the steel belt in drying zone B ≤ 80°C.

[0025] Furthermore, in step (1), the retention rate of the first smoke agent in the reconstituted tobacco ≥ 94%. The retention rate of the first smoke agent adopts a three-level automatic adjustment mode. Specifically, the retention rate of the first smoke agent is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, the sixth air inlet, the surface temperatures of the steel belts in drying zones A and B, and the running speed of the steel belt using PID. When the first smoke agent detection device shows that the retention rate of the first smoke agent in the reconstituted tobacco deviates from the set range, the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by (2 - 7)°C to achieve the first-level adjustment; if the retention rate of the first smoke agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, based on the adjustment of the hot air temperature, the surface temperatures of the steel belts in drying zones A and B are lowered by (2 - 7)°C to achieve the second-level adjustment; if the retention rate of the first smoke agent in the reconstituted tobacco still does not reach the set range requirement within 3 minutes, based on the adjustment of the surface temperature of the steel belt, the running speed of the steel belt is lowered at a frequency of 1 m / min every 3 minutes until the retention rate of the first smoke agent reaches the set range requirement to achieve the third-level adjustment.

[0026] Furthermore, in step (1), the moisture content of the reconstituted tobacco leaves is (20-24)%, and the moisture content of the reconstituted tobacco leaves is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, the sixth air inlet, the surface temperature of the steel belts in drying zones A and B, and the running speed of the steel belts by PID. When the moisture content of the reconstituted tobacco leaves exceeds the set range, the running speed of the steel belts is lowered at a frequency of 1 m / min decrease per 1 min until the moisture content of the reconstituted tobacco leaves reaches the requirements of the set range. When the moisture content of the reconstituted tobacco leaves is lower than the set range, the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by (3-6)°C to achieve the first-stage adjustment; if the moisture content of the reconstituted tobacco leaves still does not reach the requirements of the set range within 5 min, on the basis of the adjustment of the hot air temperature, the surface temperatures of the steel belts in drying zones A and B are lowered by (2-5)°C to achieve the second-stage adjustment; if the moisture content of the reconstituted tobacco leaves still does not reach the requirements of the set range within 3 min, on the basis of the adjustment of the surface temperature of the steel belts, the running speed of the steel belts is lowered at a frequency of 1 m / min decrease per 1 min until the moisture content of the reconstituted tobacco leaves reaches the requirements of the set range to achieve the third-stage adjustment.

[0027] Specifically, in step (2), the second smoking agent is 1,2-propanediol, 1,4-butanediol, etc. with a boiling point < 250°C, and the coating amount of the second smoking agent is (2-8) g / m 2 , and slot coating machine is used for surface coating.

[0028] Specifically, as Figure 2 shown, in step (3), both the upper and lower parts of the second drying section adopt hot air drying. The second drying section includes eight drying zones C, D, E, F, G, H, I, and J. Each drying zone is respectively provided with an air inlet pipeline, and each air inlet pipeline is provided with upper and lower air inlets. The hot air flow is perpendicular to the direction of the reconstituted tobacco leaves on the first wire mesh belt, and the temperature of each air inlet is controlled separately. The air inlet temperatures of drying zones C, D, I, and J ≤ 55°C, and the air inlet temperatures of drying zones E, F, G, and H ≤ 60°C.

[0029] In step (3), the retention rate of the second smoking agent in the reconstituted tobacco is ≥92%, and the retention rate of the second smoking agent adopts a two-stage automatic adjustment mode. Specifically, the retention rate of the second smoking agent is linked and set with the inlet air temperatures of eight drying zones C, D, E, F, G, H, I, and J by PID. When the detection device of the second smoking agent shows that the retention rate of the second smoking agent in the reconstituted tobacco deviates from the set range, the inlet air temperatures of drying zones E, F, G, and H are lowered by (3-6)°C to achieve the first-stage adjustment; if the retention rate of the second smoking agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, based on the adjustment of the inlet air temperatures of drying zones E, F, G, and H, the inlet air temperatures of eight drying zones C, D, E, F, G, H, I, and J are adjusted by 2°C every 3 minutes until the retention rate of the second smoking agent reaches the set range requirement to achieve the second-stage adjustment.

[0030] Preferably, in step (4), the width of the filamentous reconstituted tobacco is (0.8-1.2) mm and the length is (10-30) mm.

[0031] Specifically, as Figure 2 shown, in step (5), the third drying section uses a thin plate tobacco dryer for drying, the thin plate temperature ≤50°C, and the rotation speed of the thin plate tobacco dryer is (5-20) r / min.

[0032] In step (5), the retention rate of the first smoking agent is ≥90%, and the retention rate of the second smoking agent is ≥90%. The retention rate of the first smoking agent and the retention rate of the second smoking agent adopt a two-stage automatic adjustment mode. Specifically, the retention rate of the first smoking agent and the retention rate of the second smoking agent are linked and set with the thin plate temperature of the thin plate tobacco dryer and the rotation speed of the thin plate tobacco dryer by PID. When the retention rate of the first smoking agent or the retention rate of the second smoking agent deviates from the set range, the thin plate temperature of the thin plate tobacco dryer is lowered by (3-6)°C to achieve the first-stage adjustment; if the retention rate of the first smoking agent or the retention rate of the second smoking agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, based on the adjustment of the thin plate temperature, the rotation speed of the thin plate tobacco dryer is adjusted at a frequency of increasing 3 r / min every 2 minutes until the retention rate of the first smoking agent or the retention rate of the second smoking agent reaches the set range requirement to achieve the second-stage adjustment.

[0033] Further, in step (5), the moisture content of the filamentary reconstituted tobacco leaves is (4-7)%, and the moisture content of the filamentary reconstituted tobacco leaves, the temperature of the thin plate of the thin plate tobacco dryer, and the rotation speed of the thin plate tobacco dryer are interlocked and set by PID. When the moisture content of the filamentary reconstituted tobacco leaves is higher than the set range, the rotation speed of the thin plate tobacco dryer is adjusted at a frequency of 1 r / min decrease per 1 min until the moisture content of the filamentary reconstituted tobacco leaves reaches the set range requirement. When the moisture content of the filamentary reconstituted tobacco leaves is lower than the set range, the temperature of the thin plate of the thin plate tobacco dryer is lowered by (3-6)°C to achieve the first-stage adjustment. If the moisture content of the filamentary reconstituted tobacco leaves still does not reach the set range requirement within 5 min, on the basis of the adjustment of the thin plate temperature, the rotation speed of the thin plate tobacco dryer is adjusted at a frequency of 1 r / min increase per 1 min until the moisture content of the filamentary reconstituted tobacco leaves reaches the set range requirement, achieving the second-stage adjustment.

[0034] Preferably, among the three indicators of the first smoke agent retention rate, the second smoke agent retention rate, and the moisture content of the filamentary reconstituted tobacco leaves in step (5), if any one of them deviates from the set range, the filamentary reconstituted tobacco leaves are regarded as unqualified products. At this time, the filamentary reconstituted tobacco leaves need to be transported to the second silk storage cabinet through the third vibrating trough until the deviated indicator item of the filamentary reconstituted tobacco leaves reaches the set range requirement, and then transported to the weighing scale for packing through the second vibrating trough.

[0035] Preferably, the first smoke agent detection device in step (1), the second smoke agent detection device in step (3), and the third smoke agent detection device in step (5) are all equipped with liquid crystal displays. The first, second, and third smoke agent detection devices can detect the content of the first and second smoke agents in the reconstituted tobacco leaves and the filamentary reconstituted tobacco leaves in real time, and then calculate the first and second smoke agent retention rates according to the first and second smoke agent retention rate calculation formulas. The liquid crystal displays of the first, second, and third smoke agent detection devices correspondingly display the first and second smoke agent retention rate values. Among them:

[0036] The calculation formulas for the first smoke agent retention rate 1 and retention rate 2 are:

[0037]

[0038] In the formula:

[0039] A i ——The first smoke agent retention rate, in percentage (%), and i takes the value of 1, 2;

[0040] X n ——n takes the value of 1, 3. When n = 1, X1 refers to the real-time value of the first smoke agent content detected online by the first smoke agent detection device; when n = 3, X3 refers to the real-time value of the first smoke agent content detected online by the third smoke agent detection device, in percentage (%);

[0041] M发1 —— The addition amount of the first smoke agent in step (b), in kilograms (kg).

[0042] M 外 —— The addition amount of the added fiber pulp in step (b), in kilograms (kg).

[0043] C 外 —— The mass concentration of the added fiber pulp in step (b), in percentage (%).

[0044] M 胶 —— The addition amount of the adhesive in step (b), in kilograms (kg).

[0045] M 烟 —— The addition amount of the smoke powder in step (c), in kilograms (kg).

[0046] M 香 —— The addition amount of the essence and fragrance in step (b), in kilograms (kg).

[0047] The calculation formulas for the retention rates of the second smoke agent, namely the first retention rate and the second retention rate, are as follows:

[0048]

[0049] In the formula:

[0050] B i —— The retention rate of the second smoke agent, in percentage (%), where i takes the value of 1 or 2;

[0051] Y n —— n takes the value of 2 or 3. When n = 2, Y2 refers to the real-time value of the content of the second smoke agent detected by the second smoke agent detection device online; when n = 3, Y3 refers to the real-time value of the content of the second smoke agent detected by the third smoke agent detection device online, in percentage (%).

[0052] Y0 —— The coating amount of the second smoke agent in step (2), in grams per square meter (g / m 2 );

[0053] W —— The basis weight of the reconstituted tobacco leaf in step (2), taking values from 100 to 170, in grams per square meter (g / m 2 ).

[0054] Generally speaking, the present invention has the following advantages:

[0055] 1. The present invention adopts a three-stage hierarchical drying process. According to the principle of slow drying at low temperature, the temperatures of the first, second, and third drying sections are controlled below 80°C, 60°C, and 50°C respectively. Compared with the traditional one-stage (drying temperature > 100°C) and two-stage (drying temperature 80 - 100°C) drying processes, the drying intensity of the drying section is greatly reduced, and the volatilization loss of the smoke agent during the drying process is decreased.

[0056] 2. According to the different boiling points of each smoke agent, the present invention classifies and adds the smoke agents in segments. The smoke agent with a boiling point ≥ 250°C is added in the pulp by the in-pulp addition method during the preparation of the thick pulp slurry; the smoke agent with a boiling point < 250°C is added by the surface coating addition method at the outlet of the first drying section and the inlet of the second drying section, shortening the drying time of the low-boiling-point smoke agent during the entire production and processing process, reducing the volatilization loss of the low-boiling-point smoke agent, and improving the effective utilization rate of the smoke agent.

[0057] 3. The present invention is respectively provided with smoke agent detection devices at the outlets of the first, second, and third drying sections to online and real-time detect the retention rate of the smoke agent in the reconstituted tobacco leaves at the outlets of each drying section. The retention rate of the smoke agent in the reconstituted tobacco leaves and the operating parameters of each drying section equipment are linked and set by PID to realize the automatic regulation of the retention rate of the smoke agent in the reconstituted tobacco leaves, ensuring the content of the smoke agent in the finished product of the reconstituted tobacco leaves, improving the product quality of the reconstituted tobacco leaves for heated cigarettes by the thick pulp method, and having good process adaptability and promotion significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is the process flow chart of the present invention;

[0059] Figure 2 is the structural schematic diagram of the first drying section, the second drying section, and the third drying section of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0060] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments.

[0061] Comparative Example 1:

[0062] The thick slurry material prepared by mixing 120 parts of fully bleached softwood pulp with a beating degree of 50°SR, a wet weight of 6 g, and a mass concentration of 3%, 17 parts of glycerol, 5 parts of 1,2-propanediol, 3 parts of sodium carboxymethylcellulose, 300 parts of water, and 1.6 parts of essence and flavor is mixed with 100 parts of tobacco powder with a mesh number of 350 (tobacco powder obtained after pulverizing tobacco leaves). After being stirred evenly, it is transported to the slurry box by a screw pump and evenly coated on a running steel belt by a casting forming process. The slit gap between the casting forming box and the steel belt is 0.67 mm, and the speed of the steel belt is 9 m / min. The thick slurry follows the steel belt into the drying section. The upper part of the drying section is dried by hot air, and the bottom is dried by steam. The temperature of the hot air inlet is 90 °C, and the surface temperature of the steel belt is 105 °C. The reconstituted tobacco leaves after being processed in the drying section are transported into a cutting machine through guide rollers and cut into filamentous reconstituted tobacco leaves with a width of 1 mm and a length of 30 mm. The filamentous reconstituted tobacco leaves are transported to a storage silo through a first vibrating trough, temporarily stored in the storage silo, and then transported to a weighing scale for packing at a flow rate of 100 kg / h through a vibrating trough, thus obtaining the reconstituted tobacco leaves for heat-not-burn cigarettes by the thick slurry method.

[0063] Example 1:

[0064] A production process of reconstituted tobacco leaves for heat-not-burn cigarettes with a high retention rate of smoke agent, as Figure 1 shown, the thick slurry material prepared by mixing 120 parts of bleached softwood pulp with a beating degree of 50°SR, a wet weight of 6 g, and a mass concentration of 3%, 17 parts of glycerol, 3 parts of sodium carboxymethylcellulose, 300 parts of water, and 1.6 parts of essence and flavor is mixed with 100 parts of tobacco powder with a mesh number of 350 (tobacco powder obtained after pulverizing tobacco leaves). After being stirred evenly, it is transported to the slurry box by a screw pump and evenly coated on a running steel belt by a casting forming process. The slit gap between the casting forming box and the steel belt is 0.67 mm, and the speed of the steel belt is 9 m / min. The thick slurry follows the steel belt into the first drying section, as Figure 2As shown, hot air drying is adopted in the upper part of the first drying section, and steam drying is adopted at the bottom. The first drying section includes two drying zones A and B. The upper part of drying zone A is provided with a first air inlet, and the bottom is provided with a first steam pipeline. The hot air flow direction is opposite to the direction of the thick slurry coated on the steel belt. The temperature of the first air inlet in drying zone A of the first drying section is 60°C, and the surface temperature of the steel belt is 60°C (the first steam pipeline is located at the bottom of the steel belt). The upper part of drying zone B is provided with a second air inlet, a third air inlet, a fourth air inlet, a fifth air inlet, and a sixth air inlet, and the bottom is provided with a second steam pipeline. The hot air flow direction is perpendicular to the direction of the thick slurry coated on the steel belt, and the temperature of each air inlet is controlled separately. The temperatures of the second, third, fourth, fifth, and sixth air inlets in drying zone B are 65°C, 68°C, 68°C, 72°C, and 72°C respectively, and the surface temperature of the steel belt is 74°C. A first smoke agent detection device and a first moisture content detection device are provided at the outlet of the first drying section. The real-time data of the first smoke agent content in the reconstituted tobacco at the outlet of the first drying section is 12.9%. The first retention rate of the first smoke agent is calculated to be 95% through formula (1), and the moisture content of the reconstituted tobacco at the outlet of the first drying section is 21%. The reconstituted tobacco processed by the first drying section is transported to the surface coating process through guide rollers, and 1,2-propanediol is coated on the upper surface of the reconstituted tobacco. The coating amount of 1,2-propanediol is 5 g / m 2 . The reconstituted tobacco after surface coating is transported into the second drying section along with the first mesh belt. As Figure 2 shown, hot air drying is adopted in both the upper and lower parts of the second drying section. The second drying section includes eight drying zones C, D, E, F, G, H, I, and J. Each drying zone is respectively provided with an air inlet pipeline, and each air inlet pipeline is provided with upper and lower air inlets. The hot air flow direction is perpendicular to the direction of the reconstituted tobacco on the first mesh belt, and the temperature of each air inlet is controlled separately. The air inlet temperatures of drying zones C, D, I, and J in the second drying section are 45°C, 48°C, 50°C, and 55°C respectively, and the air inlet temperatures of drying zones E, F, G, and H are 50°C, 52°C, 55°C, and 58°C respectively. A second smoke agent detection device is provided at the outlet of the second drying section. After detection, the real-time data of the second smoke agent content in the reconstituted tobacco at the outlet of the second drying section is 3.5%. The basis weight (W ” ) of the reconstituted tobacco is 130 g / m 2 , and the coating amount (Y”) of the second smoke agent is 5 g / m 2, substituting into formula (2), the retention rate of the second smoke agent in the second stage is calculated to be 93%. The reconstituted tobacco leaves after being dried in the second drying section are conveyed by the second wire mesh belt into a cutting machine and cut into reconstituted tobacco filaments with a width of 1 mm and a length of 30 mm. The reconstituted tobacco filaments are conveyed to a storage bin through the first vibrating trough, and after being temporarily stored in the storage bin, they are conveyed to the third drying section at a flow rate of 100 kg / h. The thin plate temperature of the thin plate drying machine is 45°C, and the rotation speed of the thin plate drying machine is 7 r / min. The real-time data of the content of the first smoke agent in the reconstituted tobacco filaments at the outlet of the third drying section is 12.4%, and the real-time data of the content of the second smoke agent is 3.5%. Substituting into formula (1), the retention rate of the first smoke agent in the second stage is calculated to be 91%, and substituting into formula (2), the retention rate of the second smoke agent in the second stage is calculated to be 92%. The reconstituted tobacco filaments at the outlet of the third drying section are conveyed to a weighing scale through the second vibrating trough for packing, and thus a reconstituted tobacco leaf for heated cigarettes by the thick slurry method with a high retention rate of smoke agent is obtained.

[0065] Among them, the retention rate of the first smoke agent in the reconstituted tobacco leaf in the first stage is ≥94%, and the retention rate of the first smoke agent in the first stage adopts a three-level automatic adjustment mode. Specifically, the retention rate of the first smoke agent in the first stage is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, and the sixth air inlet, the surface temperatures of the steel belts in drying zones A and B, and the running speed of the steel belt by PID. When the first smoke agent detection device shows that the retention rate of the first smoke agent in the reconstituted tobacco leaf in the first stage deviates from the set range (lower than 94%), the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by 5°C to achieve the first-level adjustment; if the retention rate of the first smoke agent in the reconstituted tobacco leaf in the first stage still does not reach the set range requirement within 5 minutes, on the basis of adjusting the hot air temperature, the surface temperatures of the steel belts in drying zones A and B are lowered by 5°C to achieve the second-level adjustment; if the retention rate of the first smoke agent in the reconstituted tobacco leaf in the first stage still does not reach the set range requirement within 3 minutes, on the basis of adjusting the surface temperature of the steel belt, the running speed of the steel belt is lowered at a frequency of 1 m / min every 3 minutes until the retention rate of the first smoke agent in the first stage reaches the set range requirement to achieve the third-level adjustment.

[0066] Among them, the moisture content of the reconstituted tobacco leaves is (20-24)%, and the moisture content of the reconstituted tobacco leaves is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, the sixth air inlet, the surface temperatures of the steel belts in drying zones A and B, and the running speed of the steel belts by using PID. When the moisture content of the reconstituted tobacco leaves is higher than the set range, the running speed of the steel belt is lowered at a frequency of 1 m / min decrease per 1 min until the moisture content of the reconstituted tobacco leaves reaches the requirements of the set range. When the moisture content of the reconstituted tobacco leaves is lower than the set range, the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by 3°C to achieve the first-level adjustment; if the moisture content of the reconstituted tobacco leaves still does not reach the requirements of the set range within 5 min, on the basis of the adjustment of the hot air temperature, the surface temperatures of the steel belts in drying zones A and B are lowered by 5°C to achieve the second-level adjustment; if the moisture content of the reconstituted tobacco leaves still does not reach the requirements of the set range within 3 min, on the basis of the adjustment of the surface temperature of the steel belt, the running speed of the steel belt is lowered at a frequency of 1 m / min decrease per 1 min until the moisture content of the reconstituted tobacco leaves reaches the requirements of the set range to achieve the third-level adjustment.

[0067] Among them, the retention rate of the second smoking agent No. 1 ≥ 92%, and the retention rate of the second smoking agent No. 1 adopts a two-level automatic adjustment mode. Specifically, the retention rate of the second smoking agent No. 1 is interlocked with the temperatures of the air inlets in eight drying zones C, D, E, F, G, H, I, and J by using PID. When the detection device of the second smoking agent shows that the retention rate of the second smoking agent No. 1 in the reconstituted tobacco leaves deviates from the set range, the temperatures of the air inlets in drying zones E, F, G, and H are lowered by 3°C to achieve the first-level adjustment; if the retention rate of the second smoking agent No. 1 in the reconstituted tobacco leaves still does not reach the requirements of the set range within 5 min, on the basis of the adjustment of the temperatures of the air inlets in drying zones E, F, G, and H, the temperatures of the air inlets in eight drying zones C, D, E, F, G, H, I, and J are adjusted by 2°C decrease per 3 min until the retention rate of the second smoking agent No. 1 reaches the requirements of the set range to achieve the second-level adjustment.

[0068] Among them, the retention rate of the first smoking agent No. 2 ≥ 90%, and the retention rate of the second smoking agent No. 2 ≥ 90%. The retention rate of the first smoking agent No. 2 and the retention rate of the second smoking agent No. 2 adopt a two-level automatic adjustment mode. Specifically, the retention rate of the first smoking agent No. 2 and the retention rate of the second smoking agent No. 2 are interlocked with the thin plate temperature of the thin plate cut tobacco dryer and the rotation speed of the thin plate cut tobacco dryer by using PID. When the retention rate of the first smoking agent No. 2 or the retention rate of the second smoking agent No. 2 deviates from the set range, the thin plate temperature of the thin plate cut tobacco dryer is lowered by 3°C to achieve the first-level adjustment; if the retention rate of the first smoking agent No. 2 or the retention rate of the second smoking agent No. 2 in the reconstituted tobacco leaves still does not reach the requirements of the set range within 5 min, on the basis of the adjustment of the thin plate temperature, the rotation speed of the thin plate cut tobacco dryer is adjusted at a frequency of 3 r / min increase per 2 min until the retention rate of the first smoking agent No. 2 or the retention rate of the second smoking agent No. 2 reaches the requirements of the set range to achieve the second-level adjustment.

[0069] Among them, the moisture content of the filamentous reconstituted tobacco leaves is (4-7)%, and the moisture content of the filamentous reconstituted tobacco leaves, the temperature of the thin plate of the thin plate tobacco dryer, and the rotation speed of the thin plate tobacco dryer are set in a PID interlock. When the moisture content of the filamentous reconstituted tobacco leaves is higher than the set range, the rotation speed of the thin plate tobacco dryer is adjusted at a frequency of 1 r / min decrease per 1 min until the moisture content of the filamentous reconstituted tobacco leaves reaches the set range requirement. When the moisture content of the filamentous reconstituted tobacco leaves is lower than the set range, the temperature of the thin plate of the thin plate tobacco dryer is lowered by 3 °C to achieve the first-level adjustment. If the moisture content of the filamentous reconstituted tobacco leaves still does not reach the set range requirement within 5 min, on the basis of the thin plate temperature adjustment, the rotation speed of the thin plate tobacco dryer is adjusted at a frequency of 1 r / min increase per 1 min until the moisture content of the filamentous reconstituted tobacco leaves reaches the set range requirement, achieving the second-level adjustment.

[0070] The reconstituted tobacco leaf samples for heated cigarettes prepared in Comparative Example 1 and Example 1 were respectively selected, and the mass ratios of glycerol and 1,2-propanediol in each final sample were detected by gas chromatography, so as to obtain the weights of glycerol and 1,2-propanediol. The results are shown in Table 1. The retention rates of glycerol and 1,2-propanediol in each sample were calculated, and the sensory quality evaluation was carried out. The results are shown in Tables 2 and 3.

[0071] Table 1 Retention rates of glycerol and 1,2-propanediol in reconstituted tobacco leaves for heated cigarettes detected by gas chromatography

[0072]

[0073] The calculation formula for the glycerol retention rate of the reconstituted tobacco leaf samples for heated cigarettes prepared in Comparative Example 1 and Example 1 is:

[0074]

[0075] In the formula:

[0076] A' 丙三醇 ——The glycerol retention rate, in percentage (%).

[0077] M’ 丙三醇 ——The mass of glycerol in the reconstituted tobacco leaf sample for the heated cigarette to be measured, in milligrams (mg).

[0078] M’ 样 ——The mass of the reconstituted tobacco leaf sample for the heated cigarette to be measured, in milligrams (mg).

[0079] M1’ ,2-丙二醇 ——The mass of 1,2-propanediol in the reconstituted tobacco leaf sample for the heated cigarette to be measured, in milligrams (mg).

[0080] M 丙三醇—— The addition amount of glycerol in Comparative Example 1 or Example 1, unit: kilogram (kg).

[0081] M 胶 —— The addition amount of adhesive in Comparative Example 1 or Example 1, unit: kilogram (kg).

[0082] M 外 —— The addition amount of externally added fiber pulp in Comparative Example 1 or Example 1, unit: kilogram (kg).

[0083] C 外 —— The mass concentration of externally added fiber pulp in Comparative Example 1 or Example 1, unit: percentage (%).

[0084] M 烟 —— The addition amount of tobacco powder in Comparative Example 1 or Example 1, unit: kilogram (kg).

[0085] M 香 —— The addition amount of essence and flavor in Comparative Example 1 or Example 1, unit: kilogram (kg).

[0086] The calculation formula for the retention rate of 1,2 - propylene glycol in the reconstituted tobacco sample 1 of the heated cigarette prepared in Comparative Example 1 is:

[0087]

[0088] In the formula:

[0089] B1' ,2-丙二醇 —— The retention rate of 1,2 - propylene glycol, unit: percentage (%).

[0090] M’ 样 —— The mass of the measured reconstituted tobacco sample of the heated cigarette, unit: milligram (mg).

[0091] M1’ ,2-丙二醇 —— The mass of 1,2 - propylene glycol in the measured reconstituted tobacco of the heated cigarette, unit: milligram (mg).

[0092] M 1,2-丙二醇 —— The addition amount of 1,2 - propylene glycol in Comparative Example 1, unit: kilogram (kg).

[0093] M 丙三醇 —— The addition amount of glycerol in Comparative Example 1, unit: kilogram (kg).

[0094] M 胶 —— The addition amount of adhesive in Comparative Example 1, unit: kilogram (kg).

[0095] M 外 —— The addition amount of externally added fiber pulp in Comparative Example 1, unit: kilogram (kg).

[0096] C 外 —— Mass concentration of the added fiber pulp in Comparative Example 1, unit: percentage (%)

[0097] M 烟 —— Amount of tobacco powder added in Comparative Example 1, unit: kilogram (kg)

[0098] M 香 —— Amount of essence and flavor added in Comparative Example 1, unit: kilogram (kg)

[0099] The calculation formula for the retention rate of 1,2 - propanediol in the reconstituted tobacco sample of the heated cigarette prepared in Example 1 is:

[0100]

[0101] In the formula:

[0102] B1” ,2-丙二醇 —— Retention rate of 1,2 - propanediol, unit: percentage (%), i takes values 1, 2;

[0103] M” 样 —— Mass of the reconstituted tobacco sample of the measured heated cigarette, unit: milligram (mg)

[0104] M1” ,2-丙二醇 —— Mass of 1,2 - propanediol in the reconstituted tobacco of the measured heated cigarette, unit: milligram (mg)

[0105] Y” —— Coating amount of the second smoking agent in Example 1, unit: gram per square meter (g / m 2 )

[0106] W” —— Basis weight of the reconstituted tobacco in Example 1, unit: gram per square meter (g / m 2 )

[0107] Table 2 Retention rates of glycerol and 1,2 - propanediol in the reconstituted tobacco of heated cigarettes

[0108] Sample category Glycerol retention rate (%) 1,2 - Propylene glycol retention rate (%) Reconstituted tobacco sample of Comparative Example 1 85 78 Reconstituted tobacco sample of Example 1 91 92

[0109] As can be seen from Table 2, the retention rate of glycerol in the reconstituted tobacco of the heated cigarette in Example 1 reaches 91%, an increase of 7.1% compared with Comparative Example 1 (85%); the retention rate of 1,2 - propanediol in the reconstituted tobacco of the heated cigarette in Example 1 reaches 92%, an increase of 17.9% compared with Comparative Example 1 (78%).

[0110] Table 3 Sensory quality evaluation of the finished product of the reconstituted tobacco of heated cigarettes

[0111]

[0112]

[0113] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate, characterized in that, It includes the following steps: (1) Pump the thick slurry containing the first smoke agent to the slurry box, and evenly coat it on the running steel belt by the casting process; the thick slurry enters the first drying section with the steel belt, and after drying and peeling, reconstituted tobacco leaves are formed. The temperature of the first drying section is ≤80 °C. A first smoke agent detection device and a first moisture content detection device are provided at the outlet of the first drying section. The first smoke agent detection device is used to detect the real-time value of the first smoke agent content and calculate the first retention rate of the first smoke agent; (2) Convey the reconstituted tobacco leaves in step (1) to the surface coating process through guide rollers, and coat the second smoke agent on the upper surface of the reconstituted tobacco leaves; (3) Convey the reconstituted tobacco leaves after surface coating in step (2) into the second drying section with the first mesh belt. The temperature of the second drying section is ≤60 °C. A second smoke agent detection device is provided at the outlet of the second drying section. The second smoke agent detection device is used to detect the real-time value of the second smoke agent content and calculate the first retention rate of the second smoke agent; (4) The reconstituted tobacco leaves after drying in the second drying section are conveyed into a cutting machine with the second mesh belt to obtain filamentous reconstituted tobacco leaves; (5) The filamentous reconstituted tobacco leaves are conveyed to the first storage bin through the first vibrating trough, and after being temporarily stored in the first storage bin, they are conveyed to the third drying section at a flow rate of (100 - 150) kg / h. The temperature of the third drying section is ≤50 °C. A third smoke agent detection device and a second moisture content detection device are provided at the outlet of the third drying section. The third smoke agent detection device is used to detect the real-time values of the first smoke agent and the second smoke agent contents and calculate the second retention rate of the first smoke agent and the second retention rate of the second smoke agent; (6) Convey the filamentous reconstituted tobacco leaves after being processed in the third drying section in step (5) to a weighing scale through the second vibrating trough for packing into boxes, and thus a reconstituted tobacco leaf for heat-not-burn cigarettes with a high smoke agent retention rate by the thick slurry method is obtained.

2. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 1, characterized in that, In the first drying section in step (1), hot air is used to dry the upper surface of the thick slurry, and steam is used to dry the lower surface of the thick slurry. According to the advancing direction of the slurry, the first drying section includes two drying zones A and B; a first air inlet is provided at the upper part of zone A, and a first steam pipeline is provided at the bottom. The flow direction of the hot air is opposite to the direction of the thick slurry coated on the steel belt; A second air inlet, a third air inlet, a fourth air inlet, a fifth air inlet, and a sixth air inlet are provided at the upper part of zone B, and a second steam pipeline is provided at the bottom. The flow direction of the hot air is perpendicular to the direction of the thick slurry coated on the steel belt, and the temperatures of each air inlet are controlled separately.

3. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 2, characterized in that, In step (1), the retention rate of the first smoking agent in the reconstituted tobacco is ≥94%. The retention rate of the first smoking agent adopts a three-level automatic adjustment mode, that is, the retention rate of the first smoking agent is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, the sixth air inlet, the surface temperature of the steel belt in drying zones A and B, and the running speed of the steel belt by PID; when the detection device of the first smoking agent shows that the retention rate of the first smoking agent in the reconstituted tobacco deviates from the set range, the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by (2-7)°C to achieve the first-level adjustment; if the retention rate of the first smoking agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, on the basis of the hot air temperature adjustment, the surface temperatures of the steel belts in drying zones A and B are lowered by (2-7)°C to achieve the second-level adjustment; if the retention rate of the first smoking agent in the reconstituted tobacco still does not reach the set range requirement within 3 minutes, on the basis of the adjustment of the surface temperature of the steel belt, the running speed of the steel belt is lowered at a frequency of 1 m / min every 3 minutes until the retention rate of the first smoking agent reaches the set range requirement to achieve the third-level adjustment.

4. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 2, characterized in that, In step (1), the moisture content of the reconstituted tobacco is (20-24)%. The moisture content of the reconstituted tobacco is interlocked with the temperatures of the first air inlet, the second air inlet, the third air inlet, the fourth air inlet, the fifth air inlet, the sixth air inlet, the surface temperature of the steel belt in drying zones A and B, and the running speed of the steel belt by PID. When the moisture content of the reconstituted tobacco is higher than the set range, the running speed of the steel belt is lowered at a frequency of 1 m / min every 1 minute until the moisture content of the reconstituted tobacco reaches the set range requirement; when the moisture content of the reconstituted tobacco is lower than the set range, the temperatures of the fourth air inlet, the fifth air inlet, and the sixth air inlet are lowered by (3-6)°C to achieve the first-level adjustment; if the moisture content of the reconstituted tobacco still does not reach the set range requirement within 5 minutes, on the basis of the hot air temperature adjustment, the surface temperatures of the steel belts in drying zones A and B are lowered by (2-5)°C to achieve the second-level adjustment; if the moisture content of the reconstituted tobacco still does not reach the set range requirement within 3 minutes, on the basis of the adjustment of the surface temperature of the steel belt, the running speed of the steel belt is lowered at a frequency of 1 m / min every 1 minute until the moisture content of the reconstituted tobacco reaches the set range requirement to achieve the third-level adjustment.

5. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 1, characterized in that, In the step (1), the first smoke agent is glycerol, the slit gap between the casting box and the steel belt is (0.50 - 0.90) mm, and the speed of the steel belt is (4 - 20) m / min; in the step (2), the second smoke agent is one or a mixture of 1,2 - propanediol and 1,4 - butanediol in any proportion, and the coating amount of the second smoke agent is (2 - 8) g / m 2 ; surface coating is carried out by a slot coater.

6. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 1, characterized in that, In step (3), hot air drying is adopted for both the upper and lower parts of the second drying section. The second drying section includes eight drying zones C, D, E, F, G, H, I, and J. Each drying zone is respectively provided with an air inlet pipeline, and each air inlet pipeline is provided with upper and lower air inlets. The hot air flow direction is perpendicular to the walking direction of the reconstituted tobacco on the first wire mesh belt, and the temperatures of each air inlet are controlled separately.

7. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 6, characterized in that, In step (3), the retention rate of the second smoking agent in the reconstituted tobacco is ≥ 92%. The retention rate of the second smoking agent adopts a two-stage automatic adjustment mode, that is, the retention rate of the second smoking agent is linked and set with the inlet air temperatures of eight drying zones C, D, E, F, G, H, I, and J by PID. When the second smoking agent detection device shows that the retention rate of the second smoking agent in the reconstituted tobacco deviates from the set range, the inlet air temperatures of drying zones E, F, G, and H are lowered by (3 - 6)°C to achieve the first-stage adjustment. If the retention rate of the second smoking agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, on the basis of the adjustment of the inlet air temperatures of drying zones E, F, G, and H, the inlet air temperatures of eight drying zones C, D, E, F, G, H, I, and J are adjusted by decreasing 2°C every 3 minutes until the retention rate of the second smoking agent reaches the set range requirement to achieve the second-stage adjustment.

8. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 1, characterized in that, In step (5), the third drying section uses a thin-sheet dryer for drying. In step (5), the retention rate of the first smoking agent is ≥ 90%, and the retention rate of the second smoking agent is ≥ 90%. The retention rates of the first smoking agent and the second smoking agent adopt a two-stage automatic adjustment mode, that is, the retention rates of the first smoking agent and the second smoking agent are linked and set with the thin-sheet temperature of the thin-sheet dryer and the rotation speed of the thin-sheet dryer by PID. When the retention rate of the first smoking agent or the second smoking agent deviates from the set range, the thin-sheet temperature of the thin-sheet dryer is lowered by (3 - 6)°C to achieve the first-stage adjustment. If the retention rate of the first smoking agent or the second smoking agent in the reconstituted tobacco still does not reach the set range requirement within 5 minutes, on the basis of the adjustment of the thin-sheet temperature, the rotation speed of the thin-sheet dryer is adjusted at a frequency of increasing 3 r / min every 2 minutes until the retention rate of the first smoking agent or the second smoking agent reaches the set range requirement to achieve the second-stage adjustment.

9. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 8, characterized in that, In step (5), the moisture content of the filamentous reconstituted tobacco is (4 - 7)%. The moisture content of the filamentous reconstituted tobacco is linked and set with the thin-sheet temperature of the thin-sheet dryer and the rotation speed of the thin-sheet dryer by PID. When the moisture content of the filamentous reconstituted tobacco is higher than the set range, the rotation speed of the thin-sheet dryer is adjusted at a frequency of decreasing 1 r / min every 1 minute. When the moisture content of the filamentous reconstituted tobacco is lower than the set range, the thin-sheet temperature of the thin-sheet dryer is lowered by (3 - 6)°C to achieve the first-stage adjustment. If the moisture content of the filamentous reconstituted tobacco still does not reach the set range requirement within 5 minutes, on the basis of the adjustment of the thin-sheet temperature, the rotation speed of the thin-sheet dryer is adjusted at a frequency of increasing 1 r / min every 1 minute until the moisture content of the filamentous reconstituted tobacco reaches the set range requirement to achieve the second-stage adjustment.

10. The production process of reconstituted tobacco for heated cigarettes by the thick slurry method with a high smoke agent retention rate according to claim 1, characterized in that, Among the three indicators of the second retention rate of the first smoking agent, the second retention rate of the second smoking agent, and the moisture content of the filamentous reconstituted tobacco in step (5), if any one of them deviates from the set range, the filamentous reconstituted tobacco is regarded as a non-conforming product. At this time, the filamentous reconstituted tobacco needs to be conveyed to the second silk storage cabinet through the third vibrating chute until the deviated indicator item of the filamentous reconstituted tobacco meets the set range requirements, and then it is conveyed to the weighing scale through the second vibrating chute for packing in boxes.

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