Low-tar slim monitoring cigarette and preparation method thereof

Abstract

The present invention relates to a low-tar slim monitoring cigarette and a preparation method thereof, belonging to the field of tobacco technology. The low-tar slim monitoring cigarette of the present invention has good uniformity in physical, chemical, and smoke release properties. The ratio of nicotine release, tar release, and carbon monoxide release of the monitoring cigarette is 1:10:10, and the tar release is 8.22-8.77 mg / cigarette. It can be used to detect whether the smoke analysis process of slim cigarettes (8 mg) is in a statistically controlled state.

Description

Technical Field

[0001] The invention relates to a low-tar slim monitoring cigarette and a preparation method thereof, belonging to the technical field of tobacco. Background Art

[0002] With the increasing diversification and differentiation of consumption, slim cigarettes have seen rapid growth in recent years, gaining popularity among young, fashionable, and avant-garde consumers due to their distinct advantages of cost-effectiveness, low tar content, high quality, and reduced risk. Slim cigarettes have a tar yield of no more than 8mg, generally ranging from 6 to 8mg. Because they avoid the issues of reduced kick and satisfaction associated with lower tar content, slim cigarettes with an 8mg tar yield have become a new development, effectively meeting consumer demand for personalized and diversified cigarette products.

[0003] Monitoring cigarettes are cigarette samples produced for specific testing needs. They are inspected to meet specific tolerance requirements and are for laboratory use only, requiring labeling indicating they are not for human smoking. Monitoring cigarettes should exhibit good uniformity in their physical, chemical, and smoke emission properties. Tar yield settings for smoke monitoring cigarettes in my country are primarily 14mg, 9mg, and 11mg, but there is currently a lack of monitoring cigarettes with a tar yield setting of 8mg. Furthermore, due to the smaller size of slim cigarettes and the smaller amount of tobacco contained within each cigarette, their draw resistance, tar, and sensory quality fluctuate significantly compared to conventional cigarettes. Therefore, in order to better determine whether the smoke analysis process for slim cigarettes is in a state of statistical control, there is an urgent need to develop a monitoring cigarette with a tar yield setting of 8mg. Summary of the Invention

[0004] The object of the present invention is to provide a monitoring cigarette that can detect whether the smoke analysis process of a slim cigarette with a set tar release value of 8 mg is in a statistically controlled state.

[0005] Another object of the present invention is to provide a method for preparing low-tar slim monitoring cigarettes.

[0006] In order to achieve the above objectives, the technical solutions adopted by the low-tar slim monitoring cigarettes of the present invention are as follows:

[0007] A low-tar slim monitoring cigarette, which is formed by joining a mouthpiece and a tobacco rod through tipping paper; the tobacco rod includes tobacco and cigarette paper wrapping the tobacco;

[0008] The shredded tobacco is made from tobacco leaves of grade C3L produced in Pengshui, Chongqing;

[0009] The width of the tobacco is 0.8-1.0 mm, glycerin is not added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm3 ;

[0010] The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper is composed of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU, and the basis weight is 27g / m 2 , width is 19mm;

[0011] The basis weight of the tipping paper is 36 g / m 2 ;

[0012] The nozzle rod is an acetate fiber filter rod with a circumference of 16.70 mm. The tow specification in the nozzle rod is 6.0Y / 17000 denier. The pressure drop per 120 mm length of the nozzle rod is 4200 Pa. The triacetin content in the nozzle rod is 10%.

[0013] The cigarette has a mass of 0.47-0.57 g / stick, a circumference of 16.8-17.2 mm, a length of 96.5-97.5 mm, a mouthpiece length of 29.5-30.5 mm, and a connecting width of 34.5-35.5 mm.

[0014] The low-tar slim monitoring cigarettes of the present invention have good uniformity in physical, chemical and smoke release properties. The ratio of nicotine release, tar release and carbon monoxide release of the monitoring cigarettes is 1:10:10, and the tar release is 8.22-8.77 mg / cigarette. They can be used to detect whether the smoke analysis process of slim cigarettes (8mg) is in a statistically controlled state, and can meet the current tobacco industry's demand for slim cigarette (8mg) testing.

[0015] The technical solution adopted by the method for preparing the low-tar slim monitoring cigarette of the present invention is:

[0016] A method for preparing a low-tar slim monitoring cigarette comprises the following steps: using a cigarette making machine to butt-join and laminate a tobacco rod and a filter rod through tipping paper, and then cutting and segmenting the tobacco rod to obtain a monitoring cigarette; the tobacco rod comprises tobacco and cigarette paper wrapping the tobacco;

[0017] The shredded tobacco is made from tobacco leaves of grade C3L produced in Pengshui, Chongqing;

[0018] The width of the tobacco is 0.8-1.0 mm, glycerin is not added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm 3 ;

[0019] The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper is composed of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU, and the basis weight is 27g / m 2 , width is 19mm;

[0020] The basis weight of the tipping paper is 36 g / m 2 ;

[0021] The filter rod is an acetate filter rod with a circumference of 16.70 mm. The tow in the filter rod has a specification of 6.0Y / 17000 denier. The pressure drop per 120 mm long filter rod is 4200 Pa. The triacetin content in the filter rod is 10%.

[0022] The cigarette has a mass of 0.47-0.57 g / stick, a circumference of 16.8-17.2 mm, a length of 96.5-97.5 mm, a mouthpiece length of 29.5-30.5 mm, and a connecting width of 34.5-35.5 mm.

[0023] The monitoring cigarettes prepared by the preparation method of the low-tar slim monitoring cigarettes of the present invention have good uniformity in physical, chemical and smoke release properties. The ratio of nicotine release, tar release and carbon monoxide release of the monitoring cigarettes is 1:10:10, and the tar release is 8.22-8.77 mg / cigarette. They can be used to detect whether the smoke analysis process of slim cigarettes (8 mg) is in a statistically controlled state, and can meet the current tobacco industry's demand for slim cigarette (8 mg) testing.

[0024] It will be understood that the filter rod comprises a tow and a plug wrapping paper wrapping the tow.

[0025] It is understandable that after the tobacco rod and the filter rod are butt-jointed and laminated by the tipping paper and then cut and segmented, the filter rod portion on each monitoring cigarette is the mouthpiece of the monitoring cigarette.

[0026] Preferably, in the method for preparing low-tar slim monitoring cigarettes, the score length of the tipping paper is 38 mm.

[0027] In the present invention, the scoreline length refers to the length of the cigarette butt, which is determined according to the largest of the following three lengths: (1) 23 mm; (2) filter length + 8 mm; (3) tipping paper length + 3 mm.

[0028] Preferably, in the method for preparing low-tar slim monitoring cigarettes, the number of tips per tray of tipping paper is ≤1.

[0029] It is understandable that the cigarette-making machine should comply with the provisions of standard YCT 434.1-2012 "Acceptance of Tobacco Machinery Part 1: Comprehensive Determination of Cigarette Rolling Quality", that is, when tested according to the above standard, the cigarette-making quality score of the cigarette-making machine shall not be less than 85 points.

[0030] Preferably, the cigarette-making machine meets the following conditions: the standard deviation of the mass of 1000 cigarettes drawn from the cigarette-making machine is not higher than 40 mg.

[0031] Preferably, the cigarette making machine is a PROTOS1-8 cigarette making machine. Using the PROTOS1-8 cigarette making machine can reduce the quality standard deviation of the prepared cigarettes.

[0032] Preferably, during the monitoring of cigarette making process, the amount of waste of the PROTOS1-8 cigarette making machine is controlled to be 25% to 35%.

[0033] Preferably, the shredded tobacco is prepared by a method comprising the following steps: sequentially subjecting tobacco leaves to loosening and conditioning, vacuum conditioning, leaf pre-mixing, leaf feeding, leaf storage, leaf cutting, leaf conditioning, and leaf drying.

[0034] Preferably, after loosening and rehydration, the moisture content of the tobacco leaves is 16.5% to 18.5%.

[0035] Preferably, the vacuum conditioning is to first condition the loosened and conditioned tobacco leaves for a first cycle, and then condition them for a second cycle.

[0036] Preferably, the vacuum degree used in the first cycle of moisture regain is -0.095 MPa, the humidification temperature used in the first cycle of moisture regain is 55°C, and the time used in the first cycle of moisture regain is 60 seconds. Preferably, the vacuum degree used in the second cycle of moisture regain is -0.092 MPa, the humidification temperature used in the second cycle of moisture regain is 60°C, and the time used in the second cycle of moisture regain is 30 seconds.

[0037] Preferably, after the tobacco leaves are added, the moisture content is 19% to 21%. In the present invention, no other substances are added during the addition process.

[0038] Preferably, after the leaf strips are moistened, the moisture content of the leaf strips is 21.8% to 23.2%.

[0039] Preferably, the temperature used for drying the shredded leaves is 210-220°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the number of puffs, tar release, CO release, and nicotine release of the monitored cigarette prepared in Comparative Example 1;

[0041] Figure 2Schematic diagram of the number of puffs, tar release, CO release, and nicotine release of the monitored cigarette prepared in Comparative Example 2;

[0042] Figure 3 Schematic diagram of the number of puffs, tar release, CO release, and nicotine release of the monitored cigarette prepared in Comparative Example 3;

[0043] Figure 4 Schematic diagram of the mass standard deviations of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average value of the mass standard deviations of the selected monitoring cigarette samples;

[0044] Figure 5 A schematic diagram showing the mass standard deviations of 20 monitoring cigarette samples each selected during the production process of CM6 and CM7 monitoring cigarettes and the average value of the mass standard deviations of the selected monitoring cigarette samples; Figure 5 In the table, the horizontal axis is the sample number, and the vertical axis is the quality standard deviation. “SD n=20single values ​​CM7” represents the quality standard deviation of 20 monitoring cigarette samples selected each time during the production of CM7 monitoring cigarettes. “mean SD CM7” represents the average value of the quality standard deviations of the monitoring cigarette samples selected during the production of CM7 monitoring cigarettes. “SD n=20single values ​​CM6” represents the quality standard deviation of 20 monitoring cigarette samples selected each time during the production of CM6 monitoring cigarettes. “mean SD CM6” represents the average value of the quality standard deviations of the monitoring cigarette samples selected during the production of CM6 monitoring cigarettes.

[0045] Figure 6 Schematic diagram of the mass mean values ​​of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average value of the mass mean values ​​of the selected monitoring cigarette samples;

[0046] Figure 7 A schematic diagram showing the mass mean values ​​of 20 monitoring cigarette samples selected each time during the production process of CM6 and CM7 monitoring cigarettes and the average value of the mass mean values ​​of the selected monitoring cigarette samples; Figure 7In the table, the horizontal axis is the sample number, and the vertical axis is the mass. “mean n=20single values ​​CM7” represents the mass mean of 20 monitoring cigarette samples selected each time during the production of CM7 monitoring cigarettes, “mean blocks of 20CM7” represents the average of the mass mean values ​​of the monitoring cigarette samples selected during the production of CM7 monitoring cigarettes, “mean n=20single values ​​CM6” represents the mass mean of 20 monitoring cigarette samples selected each time during the production of CM6 monitoring cigarettes, and “mean blocks of 20CM6” represents the average of the mass mean values ​​of the monitoring cigarette samples selected during the production of CM6 monitoring cigarettes.

[0047] Figure 8 Schematic diagram of the circumferential means of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average of the circumferential means of the selected monitoring cigarette samples;

[0048] Figure 9 A schematic diagram showing the mean diameters of 20 monitoring cigarette samples selected each time during the production process of CM6 and CM7 monitoring cigarettes and the average of the mean diameters of the selected monitoring cigarette samples; Figure 9 In the table, the horizontal axis is the sample number, the vertical axis is the diameter, “mean n=20single values ​​CM7” represents the mean diameter of 20 monitoring cigarette samples selected each time during the production of CM7 monitoring cigarettes, “mean blocks of 20CM7” represents the average of the mean diameters of the monitoring cigarette samples selected during the production of CM7 monitoring cigarettes, “mean n=20single values ​​CM6” represents the mean diameter of 20 monitoring cigarette samples selected each time during the production of CM6 monitoring cigarettes, and “mean blocks of 20CM6” represents the average of the mean diameters of the monitoring cigarette samples selected during the production of CM6 monitoring cigarettes;

[0049] Figure 10 This is a schematic diagram of the circumferential standard deviations of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average value of the circumferential standard deviations of the selected monitoring cigarette samples;

[0050] Figure 11 Schematic diagram showing the average draw resistance values ​​of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average value of the average draw resistance values ​​of the selected monitoring cigarette samples;

[0051] Figure 12A schematic diagram showing the average draw resistance values ​​of 20 monitoring cigarette samples selected each time during the production process of CM6 and CM7 monitoring cigarettes and the average value of the average draw resistance values ​​of the selected monitoring cigarette samples; Figure 12 In the figure, the horizontal axis is the sample number, the vertical axis is the draw resistance, "mean n=20single values ​​CM7" represents the mean draw resistance of 20 monitoring cigarette samples selected each time during the production process of CM7 monitoring cigarettes, "mean blocks of 20CM7" represents the average of the mean draw resistance of the monitoring cigarette samples selected during the production process of CM7 monitoring cigarettes, "mean n=20single values ​​CM6" represents the mean draw resistance of 20 monitoring cigarette samples selected each time during the production process of CM6 monitoring cigarettes, and "mean blocks of 20CM6" represents the average of the mean draw resistance of the monitoring cigarette samples selected during the production process of CM6 monitoring cigarettes;

[0052] Figure 13 Schematic diagram of the draw resistance standard deviations of 20 monitoring cigarette samples selected each time during the production process of Experimental Example 3 and the average value of the draw resistance standard deviations of the selected monitoring cigarette samples;

[0053] Figure 14 Schematic diagram of the statistical analysis results of the stability test of smoke components of cigarette samples monitored in Experimental Example 6. DETAILED DESCRIPTION

[0054] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0055] 1. Specific embodiments of the low-tar slim monitoring cigarettes of the present invention are as follows:

[0056] Example 1

[0057] The low-tar slim monitoring cigarette of this embodiment is formed by joining a mouthpiece and a tobacco rod with tipping paper; the tobacco rod includes tobacco and cigarette paper wrapping the tobacco; the tobacco is made from tobacco leaves of grade C3L produced in Pengshui, Chongqing; the width of the tobacco is 0.8-1.0 mm, glycerin is not added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm 3 The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper consists of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU, and the quantitative weight is 27g / m 2 , width is 19mm; the basis weight of tipping paper is 36g / m 2The mouthpiece is an acetate filter rod with a circumference of 16.70 mm. The tow specification in the mouthpiece is 6.0Y / 17000 denier. The pressure drop per 120 mm long mouthpiece is 4200 Pa, and the triacetin content in the mouthpiece is 10%. The mass of the cigarette is 0.47 to 0.57 g / stick, the circumference is 16.8 to 17.2 mm, the length is 96.5 to 97.5 mm, the mouthpiece length is 29.5 to 30.5 mm, and the connecting width is 34.5 to 35.5 mm.

[0058] 2. Specific examples of the method for preparing the low-tar slim monitoring cigarettes of the present invention are as follows:

[0059] Example 2

[0060] The method for preparing the monitoring cigarettes of Example 2 includes the following steps: using a PROTOS1-8 cigarette-making machine to form tobacco shreds and cigarette paper into tobacco rods, then butting and laminating the tobacco rods with filter rods to produce monitoring cigarettes, and then packaging the prepared monitoring cigarettes using a GDX2 hard-pack packaging machine. The tobacco rods include tobacco shreds and cigarette paper wrapping the tobacco, while the filter rods include a tow and a wrapping paper wrapping the tow.

[0061] The width of the tobacco in the tobacco rod is 0.8-1.0 mm, no glycerin is added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm 3 .

[0062] The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper is composed of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU and the basis weight is 27g / m 2 , width is 19mm.

[0063] The width of the tipping paper is 70mm and the basis weight is 36g / m 2 , the line length is 38mm, and there is ≤1 joint per plate.

[0064] The filter rod is an acetate fiber filter rod with a length of 120 mm, a diameter of 5.32 mm, and a circumference of 16.70 mm. The tow in the filter rod is an acetate fiber tow with a tow specification of 6.0Y / 17000 denier. The filter rod pressure drop is 4200 Pa, and the triacetin content in the filter rod is 10%.

[0065] The mass of the cigarette is 0.47 to 0.57 g per cigarette, the circumference is 16.8 to 17.2 mm, the length is 96.5 to 97.5 mm, the length of the mouthpiece is 29.5 to 30.5 mm, the connecting width is 34.5 to 35.5 mm, and the filter tip is not perforated.

[0066] The negative pressure parameter of the PROTOS1-8 cigarette making machine was set to 100-110 kPa. The process parameters of the PROTOS-8 cigarette making machine were recorded, and the results are shown in Table 1.

[0067] Table 1 Process parameters of PROTOS-8 cigarette making machine

[0068] project unit Record the results Equalizer specifications mm 6 slots 19mm*2.5mm Rolling weight g / 20 pieces 10.6 Single weight g / piece 0.53 Speed Support / min 5000 Amount of waste yarn ％ 25 Large fan negative pressure kPa 10.5 Small fan pressure kPa 1 Height of baffle mm lowest Record short interest rate ％ 3.12

[0069] The tobacco shreds are prepared by a method comprising the following steps: tobacco leaves of grade C3L produced in Pengshui, Chongqing are subjected to loosening and moisture conditioning, vacuum moisture conditioning, leaf pre-matching, leaf feeding, leaf storage, leaf cutting, leaf moisture conditioning, and leaf drying in sequence to obtain tobacco shreds.

[0070] After loosening and rehydration, the moisture content of tobacco leaves is 16.5% to 18.5%.

[0071] Vacuum conditioning is to first temper the loose and tempered tobacco leaves for the first cycle, and then for the second cycle. The vacuum degree used in the first cycle is -0.095MPa, the humidification temperature used in the first cycle is 55℃, and the time used in the first cycle is 60s. The vacuum degree used in the second cycle is -0.092MPa, the humidification temperature used in the second cycle is 60℃, and the time used in the second cycle is 30s.

[0072] The blade pre-matching time is 16h.

[0073] After the tobacco leaves are added, the moisture content of the tobacco leaves is 19% to 21%. In the present invention, no substance is added during the addition process.

[0074] The leaf storage time is 12h.

[0075] The width of the cut leaves is 0.80 to 1.00 mm.

[0076] After the leaf fibers regain moisture, the moisture content of the leaf fibers is 21.8% to 23.2%.

[0077] The temperature used for drying the leaf silk is 210-220°C. After the leaves are dried, the moisture content of the leaf silk is 11.5-12.5%, the long silk rate (length greater than 40mm) is 64.8-65.5%, the medium silk rate is 15.5-15.9%, the short silk rate is 2.0-2.3%, and the broken silk rate is 2.0-2.3%.

[0078] Comparative Example 1

[0079] The only difference between the preparation method of the monitoring cigarette of this comparative example and the preparation method of the monitoring cigarette of Example 2 is that the combustion aid in the cigarette paper used in this comparative example consists of potassium citrate and sodium citrate in a mass ratio of 1:1, and the mass fraction of the combustion aid in the cigarette paper is 1.3%.

[0080] Comparative Example 2

[0081] The only difference between the preparation method of the monitoring cigarettes in this comparative example and the preparation method of the monitoring cigarettes in comparative example 1 is that the shredded tobacco used in this comparative example is made from tobacco leaves harvested in 2017, produced in Argentina and graded ASBFO.

[0082] Comparative Example 3

[0083] The only difference between the preparation method of the monitoring cigarette of this comparative example and the preparation method of the monitoring cigarette of Example 2 is that the shredded tobacco used in this comparative example is made from tobacco leaves harvested in 2016, produced in Argentina, and graded AS-C1F2.

[0084] Comparative Example 4

[0085] The only difference between the preparation method of the monitoring cigarette of this comparative example and the preparation method of the monitoring cigarette of Comparative Example 1 is that the air permeability of the cigarette paper used in this comparative example is 60 CU.

[0086] Comparative Example 5

[0087] The only difference between the preparation method of the monitoring cigarette of this comparative example and the preparation method of the monitoring cigarette of Example 2 is that the combustion aid in the cigarette paper used in this comparative example consists of potassium citrate and sodium citrate in a mass ratio of 1:2, and the mass fraction of the combustion aid in the cigarette paper is 1.3%.

[0088] Experimental Example 1

[0089] To investigate the effect of tobacco leaf type on the composition of the mainstream smoke from the prepared monitoring cigarettes, the total particulate matter, tar, CO, nicotine release, moisture, and puff count of the mainstream smoke from the cigarettes prepared in Example 2 and Comparative Examples 1-3 were measured during combustion according to the requirements of GB / T 19609-2004 "Determination of Total Particulate Matter and Tar Using a Conventional Analytical Smoking Machine," GB / T 23356-2009 "Determination of Carbon Monoxide in Cigarette Smoke Gas Phase - Non-scattering Infrared Method," GB / T 23203.1 "Determination of Water in Total Particulate Matter - Part 1: Gas Chromatography," and GB / T 23355 "Determination of Nicotine in Total Particulate Matter - Gas Chromatography." The results are shown in Table 2. In order to more intuitively compare the number of puffs, tar release, CO release and nicotine release of the monitored cigarettes prepared from different tobacco leaves, the above results were plotted (due to the small value of nicotine release, the product of nicotine release and 10 was used instead of nicotine release). The results are shown in the figure. Figure 1-3 shown.

[0090] Table 2 Mass, circumference, draw resistance, length and hardness of the monitored cigarettes prepared in Example 2 and Comparative Examples 1-6

[0091]

[0092] The results show that the ratio of carbon monoxide release, nicotine release and tar release in the mainstream smoke components of the monitored cigarette prepared in Comparative Example 1 is closer to 10:1:10, indicating that tobacco leaves with a grade of C3L produced in Pengshui, Chongqing are more suitable.

[0093] Experimental Example 2

[0094] To investigate the effects of cigarette paper on the physical properties and mainstream smoke composition of the prepared monitoring cigarettes, the total particulate matter, tar release, CO release, nicotine release, moisture, and number of puffs in the mainstream smoke of the cigarettes prepared in Example 2, Comparative Example 1, and Comparative Examples 4-5 were tested during combustion in accordance with the requirements of GB / T 19609-2004 "Cigarettes - Determination of total particulate matter and tar using a conventional analytical smoking machine," GB / T 23356-2009 "Cigarette smoke - Determination of carbon monoxide in the gas phase - Non-scattering infrared method," GB / T 23203.1 "Determination of moisture in total particulate matter in cigarettes - Part 1: Gas chromatography," and GB / T 23355 "Determination of nicotine in total particulate matter - Gas chromatography." When testing the monitoring cigarettes prepared in Comparative Examples 1 and 4, two experiments were conducted with different cigarette samples, and the average values ​​were calculated. When testing the monitoring cigarettes prepared in Example 2 and Comparative Example 5, 10 experiments were conducted with different cigarette samples, and the average values ​​were calculated. Finally, the average values ​​of the mainstream smoke test results during the combustion of the cigarettes prepared in Example 2, Comparative Example 1, and Comparative Example 5 were summarized. The test results are shown in Tables 3-6.

[0095] Table 3 Total particulate matter, tar release, CO release, nicotine release, moisture content and number of puffs in mainstream smoke during combustion of cigarettes prepared in Comparative Examples 1 and 4

[0096]

[0097]

[0098] The results show that the test results of mainstream smoke during the combustion of the cigarette prepared with the cigarette paper having an air permeability of 50 CU used in Comparative Example 1 are relatively close to the requirements of the relevant standards.

[0099] Table 4 Test results of mainstream smoke during the combustion of cigarettes prepared in Example 2

[0100]

[0101] Table 5 Test results of mainstream smoke during the combustion of cigarettes prepared in Comparative Example 5

[0102]

[0103]

[0104] Table 6 Average values ​​of test results of mainstream smoke during combustion of cigarettes prepared in Example 2, Comparative Example 1 and Comparative Example 5

[0105]

[0106] The results showed that the carbon monoxide release and the number of puffs during the combustion of the monitoring cigarette prepared in Example 2 were relatively high. Although the tar release and nicotine release also increased, they were both within the allowable range.

[0107] Experimental Example 3

[0108] To investigate quality fluctuations during the rolling process, the monitoring cigarette preparation method of Example 2 was used. Samples were taken every 5 minutes for a total of 26 times, with 20 cigarettes sampled each time. A Cerulean integrated test bench was used to measure the mean and standard deviation of five physical parameters: mass, circumference, draw resistance, length, and hardness. To strictly control the amount of end-of-line cigarette drop, five additional random samples (taken every 5 minutes, with 20 cigarettes sampled each time) were randomly selected to measure the amount of end-of-line cigarette drop.

[0109] The test results for the mean and standard deviation of mass, circumference, draw resistance, length, and hardness of selected monitoring cigarettes during the production process are shown in Table 7. The test results for the end-of-line drop volume of selected monitoring cigarettes during the production process are shown in Table 8.

[0110] The diagram of the quality standard deviation of 20 monitoring cigarette samples selected each time during the production process and the average value of the quality standard deviation of the selected monitoring cigarette samples is shown in the figure below: Figure 4 As shown in FIG, a schematic diagram of the mass mean of 20 monitoring cigarette samples selected each time during the production process and the average of the mass mean of the selected monitoring cigarette samples is shown in FIG. Figure 6 As shown in FIG, a schematic diagram of the circumferential mean of 20 monitoring cigarette samples selected each time during the production process and the average value of the circumferential mean of the selected monitoring cigarette samples is shown in FIG. Figure 8 As shown in FIG, a schematic diagram of the circumferential standard deviation of 20 monitoring cigarette samples selected each time during the production process and the average value of the circumferential standard deviation of the selected monitoring cigarette samples is shown in FIG. Figure 10 As shown in FIG, the average draw resistance of 20 monitoring cigarette samples selected each time during the production process and the average value of the average draw resistance of the selected monitoring cigarette samples are shown in FIG. Figure 11 As shown in FIG, a schematic diagram of the standard deviation of the draw resistance of 20 monitoring cigarette samples selected each time during the production process and the average value of the standard deviation of the draw resistance of the selected monitoring cigarette samples is shown in FIG. Figure 13 shown.

[0111] Table 7 Mean and standard deviation of mass, circumference, draw resistance and length of monitored cigarettes

[0112]

[0113] Table 8 The amount of cigarette ends falling off in 5 groups of monitoring cigarettes selected during the production process

[0114]

[0115] The results show that the average standard deviation of the mass of 8mg conventional monitoring cigarettes prepared in Example 2 is 8.77mg, which reflects a good quality control level. The maximum mass deviation of 20 conventional monitoring cigarettes is 17.014mg, which occurs once. The results provided by the International Tobacco Research Organization CORESTA (such as Figure 5 As shown in the figure, the maximum mass deviation of CM7 cigarettes is 26 mg, which occurs twice; the maximum mass deviation of CM6 cigarettes is 26 mg, which occurs once.

[0116] The average mass value of the 8mg conventional monitoring cigarettes prepared in Example 2 is 522.0mg. The results provided by the International Tobacco Research Organization CORESTA (such as Figure 7 The mean mass of the CM7 cigarettes was approximately 981 mg, and the mean mass of the CM6 cigarettes was approximately 983 mg. The fluctuations in the mean mass of the 20 monitoring cigarette samples selected during the preparation of Example 2 were similar to those in the CM7 and CM6 cigarettes.

[0117] The average value of the circumference mean of the 8mg conventional monitoring cigarettes prepared in Example 2 was 16.968mm. The fluctuation of the circumference mean of the 20 monitoring cigarette samples selected each time during the preparation of Example 2 was similar to the fluctuation of the circumference mean of the 20 monitoring cigarette samples selected each time during the preparation of CM7 and CM6 (e.g. Figure 9 shown).

[0118] The mean circumferential standard deviation of the 8mg conventional monitoring cigarettes prepared in Example 2 was 0.046mm. The fluctuations in the circumferential standard deviations of the 20 monitoring cigarette samples selected each time during the preparation of Example 2 were similar to those of the 20 monitoring cigarette samples selected each time during the preparation of CM7 and CM6.

[0119] The average draw resistance of the 8mg conventional monitoring cigarettes prepared in Example 2 was 2285.2 Pa. The fluctuations in the average draw resistance of the 20 monitoring cigarette samples selected each time during the preparation of Example 2 were similar to the fluctuations in the average draw resistance of the 20 monitoring cigarette samples selected each time during the preparation of CM7 and CM6 (e.g. Figure 12 shown).

[0120] The mean standard deviation of the draw resistance of the 8 mg conventional monitoring cigarettes prepared in Example 2 was 65.35 Pa. The fluctuations in the standard deviation of the draw resistance of the 20 monitoring cigarette samples selected each time during the preparation of Example 2 were similar to those in the 20 monitoring cigarette samples selected each time during the preparation of CM7 and CM6.

[0121] To further verify the stability of the smoke composition of finished cigarettes, samples were taken from the packaging machine outlet during the production process. A total of 60 samples were taken. Then, 30 of the 60 samples were selected for mainstream smoke parameter testing. The test results are shown in Table 9.

[0122] Table 9 Test results of number of puffs and mainstream smoke components of monitored cigarette samples

[0123]

[0124]

[0125] The results showed that the tar release, nicotine release and carbon monoxide release in the mainstream smoke of the monitored cigarettes did not fluctuate much, proving the stability of the processing process; at the same time, it was verified that the tar release was well compatible with the carbon monoxide release and nicotine release.

[0126] Experimental Example 4

[0127] The uniformity of the prepared monitoring cigarettes was tested and analyzed with reference to the provisions of GB / T 15000.3-2008 "Guidelines for Standard Samples (3) General Principles and Statistical Methods for Determining the Value of Standard Samples" and JJF 1343-2012 "General Principles and Statistical Principles for Determining the Value of Reference Materials." During the test and analysis, when the total sample volume is greater than 1000, no less than 30 samples should be drawn. The total number of monitoring cigarettes is 3000 cartons (60 pieces). 30 pieces (boxes) are randomly drawn from the total sample of 60 pieces (boxes). Then, from the selected 30 pieces (boxes), sampling is carried out according to the standard of drawing one cigarette from each box. Finally, from the 30 drawn cigarettes, three boxes of cigarettes are randomly drawn from each carton. The samples are numbered in the form of "carton number + box number" and then the selected samples are used for smoke analysis.

[0128] Test samples were equilibrated according to the requirements of GB / T 16447, with an equilibration time of no less than 48 hours but no more than 10 days. Using a rotary smoking machine (20 cigarettes smoked per filter), the mainstream smoke of the cigarette samples was tested for tar, CO, nicotine release, and the number of puffs during combustion in accordance with GB / T 19609-2004 "Cigarettes - Determination of Total Particulate Matter and Tar Using a Conventional Analytical Smoking Machine," GB / T 23356-2009 "Cigarette Smoke - Determination of Carbon Monoxide in the Gas Phase - Non-scattered Infrared Method," and GB / T 23355 "Cigarette - Determination of Nicotine in the Total Particulate Matter - Gas Chromatographic Method." Tar, CO, and nicotine release are expressed in mg / cigarette, while puffs are expressed in puffs / cigarette. According to GB / T 15000.3-2008 “Guidelines for the determination of reference materials (3) General principles and statistical methods for the determination of reference materials” and JJF1343-2012 “General principles and statistical principles for the determination of reference materials”, the test results were analyzed and the uniformity of the test results was determined.

[0129] The test results of the tar release and uniformity of mainstream smoke during the combustion of monitored cigarette samples are shown in Tables 10-11.

[0130] Table 10 Mainstream smoke tar release during combustion of monitored cigarette samples (mg / cigarette)

[0131]

[0132]

[0133] Table 11 Test results of uniformity of tar release in mainstream smoke during combustion of monitored cigarette samples

[0134]

[0135] The results showed that the uniformity test result of the tar release of cigarette samples was F=0.919, which was less than the critical value of 1.656, indicating that the uniformity of the tar release in the mainstream smoke during the combustion of the samples was good.

[0136] The test results of nicotine release and uniformity in mainstream smoke during the combustion of monitored cigarette samples are shown in Tables 12-13.

[0137] Table 12 Nicotine release in mainstream smoke during combustion of monitored cigarette samples (mg / cigarette)

[0138]

[0139]

[0140] Table 13 Test results of uniformity of nicotine release in mainstream smoke during combustion of monitored cigarette samples

[0141]

[0142] The results showed that F-test = 0.942, which was less than the critical value of 1.656, indicating that the nicotine release in the mainstream smoke during the combustion of the sample was well uniform.

[0143] The test results of carbon monoxide release and uniformity in mainstream smoke during the combustion of monitored cigarette samples are shown in Tables 14-15.

[0144] Table 14 Carbon monoxide release in mainstream smoke during combustion of monitored cigarette samples (mg / cigarette)

[0145] Article number Box 1 Box 2 Box 3 average value 1 6.84 6.96 6.78 6.86 2 6.90 6.74 6.64 6.76 3 6.92 6.90 6.85 6.89 4 6.70 6.93 6.96 6.86 5 6.92 6.87 6.85 6.88 6 6.93 6.73 6.88 6.85 7 7.15 6.85 7.06 7.02 8 6.96 6.89 6.91 6.92 9 6.81 6.77 6.76 6.78 10 6.73 6.84 6.67 6.75 11 7.03 6.85 6.98 6.95 12 6.83 6.91 6.75 6.83 13 6.96 6.94 6.91 6.94 14 6.90 6.70 6.84 6.81 15 6.94 6.94 6.88 6.92 16 6.77 6.95 6.74 6.82 17 6.94 7.31 6.86 7.04 18 6.93 6.98 6.90 6.94 19 6.85 6.83 6.78 6.82 20 6.88 6.74 6.85 6.82 21 6.77 7.05 6.79 6.87 22 6.63 6.84 6.97 6.81 23 6.84 6.98 7.05 6.96 24 6.95 6.91 6.67 6.84 25 6.84 6.95 6.78 6.86 26 6.87 6.78 6.98 6.88 27 7.05 6.95 6.79 6.93 28 6.90 6.94 6.98 6.94 29 6.75 6.86 6.75 6.79 30 6.66 6.89 6.84 6.80

[0146] Table 15 Uniformity test results of carbon monoxide release in mainstream smoke during combustion of monitored cigarette samples

[0147]

[0148] The results show that F is 1.381, which is less than the critical value of 1.656, indicating that the carbon monoxide release in the mainstream smoke during the combustion of the sample is well uniform.

[0149] The results of the monitoring of the number of puffs of cigarette samples and their uniformity test are shown in Tables 16-17.

[0150] Table 16 Number of puffs of monitored cigarette samples (puffs / stick)

[0151]

[0152]

[0153] Table 17 Uniformity test results of the number of puffs of monitored cigarette samples

[0154]

[0155] The results show that F-test = 0.996, which is less than the critical value of 1.656, indicating that the uniformity of the number of puffs in the sample is good.

[0156] In summary, there was no significant difference in the number of puffs, tar release, nicotine release and carbon monoxide release of the cigarette samples, and the samples had good uniformity.

[0157] Experimental Example 5

[0158] In accordance with GB / T 6379.2-2004, "Accuracy (Trueness and Precision) of Measurement Methods and Results - Part 2: Basic Methods for Determining the Repeatability and Reproducibility of Standard Measurement Methods," 24 laboratories jointly tested the monitoring cigarettes prepared in Example 2 using the same analytical method for quality, puff count, total particulate matter, tar, carbon monoxide, nicotine, and water release. The average of the results measured by each laboratory was designated as the standard value (fixed value). Each laboratory was required to select one or more smoking machines of various models (both linear and rotary) for the joint experiment. The China Tobacco Standardization Research Center distributed samples based on the number of smoking machines provided by each laboratory, with three sample cartons per machine. During the experiment, one carton was drawn as a sample. From this sample, 100 cigarettes were selected as the test cigarette sample group (excluding those with obvious defects). These were balanced according to the requirements of GB / T 16447. The cigarette samples for each test were randomly selected from the balanced cigarette sample group. Two remaining cigarettes were kept as backup samples.

[0159] The cigarette samples were then smoked using a linear smoking machine and a rotating disc smoking machine. Before testing, the smoking machine should be checked to ensure that it meets the requirements of GB / T 16450-2004, "Definitions and Standard Conditions for Smoking Machines for Routine Analytical Use." The total weight of the 20 cigarettes to be tested (after balancing) should be recorded before each smoking session. Each test cigarette sample group consisted of 100 cigarettes. Each test cigarette sample group was divided into five groups, each smoked over five separate days. The smoking schedules for the linear smoking machine (20 and 16 holes) and the rotating disc smoking machine were followed according to the protocols in Tables 18-20.

[0160] Table 18 Smoking plan of 20-hole linear smoking machine

[0161]

[0162] Note: M3 means that the corresponding hole is used for suction, - means that the corresponding hole is not used for suction.

[0163] Table 19 Smoking scheme of 16-hole linear smoking machine

[0164]

[0165] Note: M3 means that the corresponding hole is used for suction, - means that the corresponding hole is not used for suction.

[0166] Table 20 Rotary Smoking Machine Smoking Scheme

[0167]

[0168] Note: M3 means that the corresponding rounds of suction are used, and - means that the corresponding rounds of suction are not used.

[0169] If the calibration unit (laboratory) has both linear smoking machines and rotary smoking machines, it should conduct tests and report the results on the two smoking machines separately. Each smoking machine involved in the experiment should be assigned a fixed operator. The linear smoking machine smokes 5 cigarettes per channel (each sample smokes 4 channels per round, a total of 20 cigarettes), and provides one test result; the rotary smoking machine provides one test result per filter (smoking 20 cigarettes). The units of the total particulate matter, tar release, carbon monoxide release, nicotine release and water release of the smoke obtained from the test are mg / cigarette, the unit of the number of puffs obtained from the test is puffs / cigarette, and the unit of the adjusted mass of 20 cigarettes (after adjusting the balance, the mass of the 20 cigarettes to be smoked on the machine is weighed on a balance) is g / 20 cigarettes. Among them, the total particulate matter and tar emissions are tested in accordance with GB / T 19609-2004 "Cigarettes - Determination of total particulate matter and tar using a conventional analytical smoking machine", the carbon monoxide emissions are tested in accordance with GB / T 23356-2009 "Cigarette smoke - Determination of carbon monoxide in the gas phase - Non-scattering infrared method", the nicotine emissions are tested in accordance with GB / T 23355 "Cigarette total particulate matter - Determination of nicotine - Gas chromatography method", and the moisture content in the total particulate matter is tested in accordance with GB / T 23203.1 "Cigarette total particulate matter - Determination of moisture - Part 1: Gas chromatography method".

[0170] A total of 24 laboratories participated in the experiment, and the feedback data results were 25 groups (22 groups of data were obtained by rotating smoking machine testing, and 3 groups of data were obtained by linear smoking machine testing). Referring to the CM series monitoring cigarette calibration process published by CORESTA, the outliers in the test results were eliminated in accordance with the GB / T 6379 "Results and Accuracy of Measurement Methods" series of standards. Then, the retained data after eliminating the outliers were summarized and calculated in accordance with the GB / T 6379 "Results and Accuracy of Measurement Methods" series of standards. The mean value of the standard deviation (SD) of the quality between groups was 3.70mg, and the calibration results and reproducibility standard deviation S r , repeatability limit r, reproducibility standard deviation S R The reproducibility limit R is shown in Table 21.

[0171] Table 21 Summary of fixed values

[0172]

[0173] The results show that the reproducibility standard deviation S of the number of puffs, tar release, nicotine release and carbon monoxide release of the monitoring cigarette prepared by the present invention is r The performance of the three-group quality standard deviation (SD) and the mean value of the inter-group quality standard deviation (SD) were good, which was comparable with the CM monitoring cigarettes and could be used to monitor the whole process of smoke analysis.

[0174] Experimental Example 6

[0175] Cigarette stability testing was carried out with reference to GB / T 15000.3-2008 “Guidelines for Standard Samples (3) General Principles and Statistical Methods for the Determination of the Value of Standard Samples” and JJF 1343-2012 “General Principles and Statistical Principles for the Determination of the Value of Reference Materials”.

[0176] First, 25 samples were taken and then placed in a van for an 8-hour transportation test on ordinary roads. Then, 3 samples were randomly selected from the samples after the transportation test and sent to the laboratory for the first stability test. At the same time, the remaining 22 samples (not subjected to the first stability test) were first placed in a 4°C environment for 72 hours, and then placed in a 35°C environment for 72 hours (simulating the temperature changes in the transportation environment), and then placed in a conventional storage environment. Four months after the first test, 3 samples were randomly selected from the 22 samples for the second stability test. Finally, seven months after the first test, 3 samples were randomly selected from the remaining samples (19) for the third stability test.

[0177] During each stability test, 100 cigarettes were randomly selected from the three selected cigarette samples and tested in the same laboratory. The stability test method is as follows: First, the test sample is equilibrated in accordance with the requirements of GB / T 16447. The equilibration time should be no less than 48 hours but no more than 10 days. Then, the mainstream smoke tar yield (mg / cigarette), CO yield (mg / cigarette), nicotine yield (mg / cigarette), and number of puffs (puffs / cigarette) of the test sample during combustion are measured using a smoking machine in accordance with the requirements of GB / T 19609-2004 "Cigarettes - Determination of Total Particulate Matter and Tar Using a Conventional Analytical Smoking Machine," GB / T 23356-2009 "Determination of Carbon Monoxide in Cigarette Smoke - Gas Phase - Non-scattering Infrared Method," and GB / T 23355 "Determination of Nicotine in Total Particulate Matter - Gas Chromatographic Method." During each smoke test, the laboratory temperature and relative humidity should be checked and recorded to ensure that the smoking machine meets the requirements of GB / T 16450-2004, "Definition and Standard Conditions for Smoking Machines for Routine Analytical Use." The smoking machine involved in the experiment should be stationary, and the operator should be stationary. The test results are shown in Tables 22-25.

[0178] Table 22 Mainstream smoke tar release during combustion of the tested samples in the stability test (mg / cigarette)

[0179]

[0180] Table 23 Nicotine release in mainstream smoke during combustion of the tested samples in the stability test (mg / cigarette)

[0181]

[0182] Table 24 Mainstream smoke CO release during combustion of the tested samples in the stability test (mg / stick)

[0183]

[0184] Table 25 Number of puffs of the samples to be tested in the stability test (puffs / stick)

[0185]

[0186] According to the requirements of JJF1343-2012, since there is no accurate model that can reflect the actual change pattern of cigarette smoke components, the linear model is selected as the empirical model. The statistical analysis results of the smoke component stability test of the tested samples are shown in Table 26 and Figure 14 shown.

[0187] Table 26 Statistical analysis results of the stability test of smoke components of the monitored cigarettes prepared in Example 2

[0188]

[0189] The results show that the stability test is effective for the tar, nicotine, CO and number of puffs of the tested samples. All of the above were established, and no instability was observed, that is, there was no significant difference in the number of cigarette puffs, tar, nicotine in smoke, and carbon monoxide release in smoke during the experimental period, and the sample had good stability.

Claims

1. A low-tar slim monitoring cigarette, characterized in that: It is formed by joining a mouthpiece and a tobacco rod through tipping paper; the tobacco rod includes tobacco and cigarette paper wrapping the tobacco; The shredded tobacco is made from tobacco leaves of grade C3L produced in Pengshui, Chongqing; The width of the tobacco is 0.8-1.0 mm, no glycerin is added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm 3 ; The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper is composed of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU, and the basis weight is 27g / m 2 , width is 19mm; The basis weight of the tipping paper is 36 g / m 2 ; The filter rod is an acetate fiber filter rod with a circumference of 16.70 mm. The tow specification in the filter rod is 6.0Y / 17000 denier. The pressure drop per 120 mm of the filter rod is 4200 Pa. The triacetin content in the filter rod is 10%. The cigarette has a mass of 0.47-0.57 g / stick, a circumference of 16.8-17.2 mm, a length of 96.5-97.5 mm, a mouthpiece length of 29.5-30.5 mm, and a tip width of 34.5-35.5 mm.

2. A method for preparing low-tar slim monitoring cigarettes, characterized in that: The following steps are involved: A cigarette making machine is used to butt-join and compound a tobacco rod and a filter rod through tipping paper, and then cut and segment them to obtain a monitoring cigarette; the tobacco rod includes tobacco and cigarette paper wrapping the tobacco; The shredded tobacco is made from tobacco leaves of grade C3L produced in Pengshui, Chongqing; The width of the tobacco is 0.8-1.0 mm, no glycerin is added to the tobacco, the moisture content of the tobacco is 11.5%-12.5%, and the density of the tobacco in the tobacco rod is 254-266 mg / cm 3 ; The cigarette paper is a horizontal-grained full-linen cigarette paper. The combustion aid in the cigarette paper is composed of potassium citrate and sodium citrate. The mass ratio of potassium citrate to sodium citrate is 1:1, and the mass fraction of the combustion aid in the cigarette paper is 0.9%. The air permeability of the cigarette paper is 50CU, and the basis weight is 27g / m 2 , width is 19mm; The basis weight of the tipping paper is 36 g / m 2 ; The filter rod is an acetate filter rod with a circumference of 16.70 mm. The tow specification in the filter rod is 6.0Y / 17000 denier. The pressure drop per 120 mm long filter rod is 4200 Pa. The triacetin content in the filter rod is 10%. The cigarette has a mass of 0.47-0.57 g / stick, a circumference of 16.8-17.2 mm, a length of 96.5-97.5 mm, a mouthpiece length of 29.5-30.5 mm, and a tip width of 34.5-35.5 mm.

3. The method for preparing the low-tar slim monitoring cigarette according to claim 2, wherein: The cigarette making machine is a PROTOS1-8 cigarette making machine.

4. The method for preparing a low-tar slim monitoring cigarette according to claim 2 or 3, wherein: The shredded tobacco is prepared by a method comprising the following steps: sequentially subjecting tobacco leaves to loosening and moisture conditioning, vacuum moisture conditioning, leaf pre-mixing, leaf storage, leaf cutting, leaf moisture conditioning, and leaf drying.

5. The method for preparing a low-tar slim monitoring cigarette according to claim 4, wherein: After loosening and rehydration, the moisture content of tobacco leaves is 16.5%~18.5%.

6. The method for preparing a low-tar slim monitoring cigarette according to claim 4, wherein: The vacuum conditioning is to first condition the loosened and conditioned tobacco leaves for a first cycle, and then condition them for a second cycle.

7. The method for preparing a low-tar slim monitoring cigarette according to claim 6, wherein: The vacuum degree used in the first cycle of moisture regain is -0.095 MPa, the humidification temperature used in the first cycle of moisture regain is 55°C, and the time used in the first cycle of moisture regain is 60s.

8. The method for preparing a low-tar slim monitoring cigarette according to claim 6, wherein: The vacuum degree used in the second cycle of moisture regain is -0.092 MPa, the humidification temperature used in the second cycle of moisture regain is 60°C, and the time used in the second cycle of moisture regain is 30s.

9. The method for preparing a low-tar slim monitoring cigarette according to claim 4, wherein: After the leaf fibers regain moisture, the moisture content of the leaf fibers is 21.8%~23.2%.

10. The method for preparing a low-tar slim monitoring cigarette according to claim 4, wherein: The temperature used for drying the leaf strips is 210~220℃.

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