Homogenized tobacco leftover material mixture and homogenized sheet

Abstract

The invention discloses a homogenized tobacco leftover mixture and a homogenized sheet. The homogenized tobacco leftover material mixture comprises crushed tobacco leaves, tobacco stems and tobacco powder, the crushed tobacco leaves, the tobacco stems and the tobacco powder are homogenized, MAX {CT-H / C, TS-H / C and TW-H / C} is smaller than or equal to 140%, MAX {CT-O / C, TS-O / C and TW-O / C} is smaller than or equal to 60%, CT-H / C is the molar ratio of hydrogen to carbon of the crushed tobacco leaves, CT-O / C is the molar ratio of oxygen to carbon of the crushed tobacco leaves, TS-H / C is the molar ratio of hydrogen to carbon of the tobacco stems, and TW-H / C is the molar ratio of hydrogen to carbon of the tobacco stems. TS-O / C is the molar ratio of oxygen to carbon of the tobacco stems, TP-H / C is the molar ratio of hydrogen to carbon of the tobacco powder, and TP-O / C is the molar ratio of oxygen to carbon of the tobacco powder. Compared with the common tobacco leftover material or the mixture thereof, the tobacco flavor is improved, the problem that the tobacco leftover material causes uncontrollable interference on the formula and taste of the tobacco raw materials when being used for producing homogenized sheets due to the fact that the tobacco leftover material is complex in source and different in property is solved, and the utilization rate of the tobacco raw materials is greatly increased.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco, and in particular relates to a homogenized tobacco scrap mixture and a homogenized sheet. Background Art

[0002] During the production and processing of tobacco leaves, about 25% of tobacco leaves and tobacco dust are difficult to use in cigarette production. In addition, a large amount of waste tobacco leaves, fireworks, tobacco straw and other tobacco field wastes are not properly handled. In order to improve the utilization rate of tobacco resources, the above tobacco scraps are generally used for flake production. In heated cigarette products, the smoking section is entirely composed of flakes, so the formula stability of the flakes is crucial to product quality.

[0003] However, due to the complex and uncontrollable sources of tobacco scraps, and their diverse properties and categories, it is unrealistic to use them as thin sheet raw materials for heated cigarette products according to the differences in the characteristics of various types of tobacco scraps. A feasible method is to add tobacco scraps as a type of raw material to the raw material formula of the thin sheet, so the uniformity of the properties of tobacco scraps is extremely important. In the prior art, there is a solution of homogenizing different tobacco scraps by screening, swelling, drying, etc., and then mixing them, but it can only improve the consistency of the physical properties of the mixture such as moisture content, breakability or mixability, but it is impossible to homogenize the flavor substances to achieve the consistency of the mixture in chemical properties and sensory experience.

[0004] It can be seen that there is an urgent need for a technical solution that can improve the homogenization degree of tobacco scrap mixture, thereby improving the utilization rate of tobacco resources and adding tobacco scraps to the flake formula to produce flake products with stable quality. Summary of the invention

[0005] The purpose of the present invention is to improve the homogenization degree of the tobacco scrap mixture, in order to solve the technical problem:

[0006] The first aspect of the present invention provides a homogenized tobacco scrap mixture, comprising: crushed tobacco leaves (Crumbled Tobacco), tobacco stems (Tobacco Stems) and tobacco powder (Tobacco Powder), the crushed tobacco leaves, tobacco stems and tobacco powder are homogenized and meet the following conditions: MAX{CT-H / C, TS-H / C, TW-H / C}≤140%, and MAX{CT-O / C, TS-O / C, TW-O / C}≤60%, wherein CT-H / C is the hydrogen-carbon molar ratio of the crushed tobacco leaves, CT-O / C is the oxygen-carbon molar ratio of the crushed tobacco leaves, TS-H / C is the hydrogen-carbon molar ratio of the tobacco stems, TS-O / C is the oxygen-carbon molar ratio of the tobacco stems, TP-H / C is the hydrogen-carbon molar ratio of the tobacco powder, and TP-O / C is the oxygen-carbon molar ratio of the tobacco powder.

[0007] Further, satisfy: MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤18%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤15%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤12%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS- O / C,TW-O / C}≤10%, or MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤8%.

[0008] Furthermore, the homogenization treatment comprises: step A: subjecting the crushed tobacco leaves, tobacco stems and tobacco dust to low-temperature and low-oxygen heat treatment; and step B: obtaining the homogenized tobacco scrap mixture after cooling.

[0009] Furthermore, the sieved particle size of the homogenized tobacco scrap mixture is 30-60 microns, 60-120 microns, 120-200 microns, or 200-300 microns.

[0010] Furthermore, the treatment temperature of the low-temperature and low-oxygen heat treatment is 150-170°C, 170-190°C, 190-230°C, or 230-250°C.

[0011] Furthermore, the treatment time of the low-temperature and low-oxygen heat treatment is 0.5 to 1 hour, 1 to 2 hours, or 2 to 4 hours.

[0012] Furthermore, the processing atmosphere of the low-temperature and low-oxygen heat treatment is an inert atmosphere or a weakly oxidizing atmosphere; further, the oxygen concentration of the processing atmosphere is 0-0.1 vol%, 0.1-1.0 vol%, 1.0-2.0 vol%, or 2.0-4.0 vol%; further, the protective gas of the processing atmosphere is nitrogen, argon and / or carbon dioxide.

[0013] Furthermore, the homogenized tobacco scrap mixture further includes one or more of fireworks, cigarette sticks and / or waste containing tobacco components that have been homogenized.

[0014] A second aspect of the present invention provides a homogenized sheet made from a homogenized sheet raw material comprising the above-mentioned homogenized tobacco scrap mixture.

[0015] Further, the homogenized flake raw material composition is as follows:

[0016]

[0017] The present invention provides a homogenized tobacco scrap mixture, by controlling the hydrogen-carbon element molar ratio, the oxygen-carbon element molar ratio and the oxygen-carbon element molar ratio, at least a mixture with better uniformity can be obtained, and the tobacco aroma is improved compared with ordinary tobacco scraps or their mixtures, avoiding the problem that the tobacco scraps are complicated in source and different in nature, which causes uncontrollable interference to the formula and taste of tobacco raw materials when used for homogenized sheet production, and greatly broadens the utilization rate of tobacco raw materials. In addition, the processing process of the present invention can slightly crack and remove the light volatile components in the tobacco material, and the main reaction is the rupture of some oxygen-containing functional groups, which significantly reduces the structure that causes different properties of different tobacco scraps; and after the oxygen-containing components in the tobacco material are reduced, the concentration of phenolic and ketone flavor substances in the released flue gas will increase, which can further improve the taste of smoking. At the same time, the processing technology of the present invention can also improve the hydrophobicity of the raw materials after processing and reduce the water absorption of the homogenized flakes produced; since certain light volatile components are removed, the homogenized flakes produced release a higher concentration of flavor components when heated and have a better taste; in addition, the scraps that were difficult to crush in the past are also easier to powderize, making them more suitable for flake manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above content and the following specific embodiments of the present invention will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed for protection.

[0019] Figure 1 It is the oxygen-carbon element molar ratio-hydrogen-carbon element molar ratio coordinate diagram, where:

[0020] CT1 corresponds to the homogenized shredded tobacco leaves in the first group of test samples; TW1 corresponds to the homogenized tobacco ends in the first group of test samples; TS1 corresponds to the homogenized tobacco stems in the first group of test samples;

[0021] CT2 corresponds to the homogenized shredded tobacco leaves in the second test sample; TW2 corresponds to the homogenized tobacco ends in the second test sample; TS2 corresponds to the homogenized tobacco stems in the second test sample;

[0022] CT3 corresponds to the shredded tobacco leaves in the comparison sample that have not been homogenized; TW3 corresponds to the tobacco dust in the comparison sample that have not been homogenized; TS3 corresponds to the tobacco stems in the comparison sample that have not been homogenized. DETAILED DESCRIPTION

[0023] The detailed features and advantages of the present invention are described in detail in the specific implementation modes below, and the contents are sufficient to enable any person skilled in the art to understand the technical contents of the present invention and implement them accordingly. Moreover, according to the description, claims and drawings disclosed in this specification, those skilled in the art can easily understand the relevant objects and advantages of the present invention.

[0024] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The experimental methods described in the embodiments of the present invention are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments can be obtained from commercial channels unless otherwise specified.

[0026] The invention provides a homogenized tobacco scrap mixture, comprising: crushed tobacco leaves, tobacco stems and tobacco powder. The crushed tobacco leaves, tobacco stems and tobacco powder are homogenized and meet the following conditions: MAX{CT-H / C, TS-H / C, TW-H / C}≤140%, and MAX{CT-O / C, TS-O / C, TW-O / C}≤60%, wherein CT-H / C is a hydrogen-carbon molar ratio of the crushed tobacco leaves, CT-O / C is an oxygen-carbon molar ratio of the crushed tobacco leaves, TS-H / C is a hydrogen-carbon molar ratio of the tobacco stems, TS-O / C is an oxygen-carbon molar ratio of the tobacco stems, TP-H / C is a hydrogen-carbon molar ratio of the tobacco powder, and TP-O / C is an oxygen-carbon molar ratio of the tobacco powder.

[0027] The inventors of the present invention discovered during the research process that carbon, hydrogen and oxygen are closely related to the content of flavor substances in tobacco scraps. By controlling the hydrogen-carbon molar ratio, oxygen-carbon molar ratio and oxygen-carbon molar ratio through specific process means, a scrap mixture with better uniformity can be obtained. Compared with ordinary tobacco scraps or their mixtures, the tobacco aroma is improved, and the problem of uncontrollable interference to the formula and taste of tobacco raw materials when used in the production of homogenized slices due to the complex sources and different properties of tobacco scraps is avoided, thereby greatly broadening the utilization rate of tobacco raw materials.

[0028] The present invention provides specific embodiments as follows:

[0029] Preparation of the first set of test samples

[0030] Take discarded broken tobacco leaves, tobacco dust, and tobacco stems, remove impurities and metals, and crush the above scraps through a pulverizer, and take powders in the range of 30 to 120 microns for use. Spread the above three powders separately and place them in a baking oven, and heat treat them at 180°C for 1 hour. During the reaction, nitrogen is passed through the baking oven to make the reaction atmosphere a protective atmosphere. After the heat treatment is completed, the broken tobacco leaves, tobacco dust, and tobacco stems that have been homogenized are obtained after natural cooling, which are recorded as CT1, TW1, and TS1 respectively.

[0031] Preparation of the second set of test samples

[0032] Take discarded broken tobacco leaves, tobacco dust, and tobacco stems, remove impurities and metals, and crush the above scraps through a pulverizer, and take powders in the range of 30 to 120 microns for use. Spread the above three powders separately and place them in a baking oven, and heat treat them at 180°C for 1 hour. During the reaction, nitrogen and oxygen are passed through the baking oven to make the reaction atmosphere a weak oxidizing atmosphere (oxygen content 4 vol%). After the heat treatment is completed, the broken tobacco leaves, tobacco dust, and tobacco stems that have been homogenized are obtained after natural cooling, which are recorded as CT2, TW2, and TS2 respectively.

[0033] Preparation of the third set of test samples

[0034] 0.25 kg each of CT1, TW1, TS1, CT2, TW2 and TS2 were taken and mixed with 0.25 kg of tobacco leaves, 0.25 kg of glycerol, 0.03 kg of sodium carboxymethyl cellulose, 0.05 kg of additional fiber (coniferous wood high-yield pulp) and 0.17 kg of water, and six kinds of homogenized sheets containing homogenized broken tobacco leaves, tobacco dust and tobacco stem scraps were prepared by roller pressing. The sheets were then produced as heat-not-burn tobacco, which were respectively recorded as HT-CT1, HT-TW1, HT-TS1, HT-CT2, HT-TW2 and HT-TS2.

[0035] Examples 1 to 8: Tobacco scrap mixture

[0036] Take discarded scraps such as broken tobacco leaves, tobacco dust, and tobacco stems, remove impurities and metals, lay the scraps flat in a baking oven, and perform heat treatment according to the treatment conditions in Table 1. Control the atmosphere in the baking oven during the reaction. After the heat treatment, cool naturally to obtain homogenized broken tobacco leaves, tobacco dust, and tobacco stems. Referring to Table 1, before or after the heat treatment, the above scraps are crushed by a pulverizer, and the powders of the corresponding crushed particle size are weighed and mixed to obtain the tobacco scrap mixture of Examples 1 to 8.

[0037] Examples 9-16: Homogenized flakes

[0038] The tobacco scrap mixtures of Examples 1 to 8 were taken in sequence, and 0.25 kg of tobacco leaves, 0.25 kg of glycerol, 0.03 kg of sodium carboxymethyl cellulose, 0.05 kg of additional fiber (coniferous wood high-yield pulp), and 0.17 kg of water were prepared by roller pressing to obtain 8 kinds of homogenized flakes, namely the homogenized flakes of Examples 9 to 16.

[0039] Examples 17-24: Heated Cigarettes

[0040] The homogenized sheets of Examples 9 to 16 were processed into heated cigarettes in sequence, respectively, to obtain heated cigarettes of Examples 17 to 24.

[0041] Table 1: Processing conditions and mixing schemes of tobacco scrap mixtures of Examples 1 to 8

[0042]

[0043]

[0044] During the heat treatment in Example 3, the concentrations of H2, CH4 and CO in the gas generated by the low-temperature and low-oxygen heat treatment are monitored (the detection equipment can be a flue gas analyzer or a coal gas analyzer). When the concentrations of the above gases detected all decrease, the low-temperature and low-oxygen heat treatment is stopped and cooling is started. The treatment time of the homogenization treatment in Example 3 is shorter than 1 hour.

[0045] Preparation of comparative samples

[0046] Take discarded broken tobacco leaves, tobacco dust, and tobacco stems, remove impurities and metals, and grind the above scraps through a pulverizer, and take powders in the range of 30 to 120 microns for use, which are recorded as CT3, TW3, and TS3 respectively. Take 0.25 kg of CT3, TW3, and TS3 respectively, and add 0.25 kg of tobacco raw material, 0.25 kg of glycerol, 0.03 kg of sodium carboxymethyl cellulose, 0.05 kg of fiber (coniferous wood high-yield pulp), and 0.17 kg of water, and prepare three types of homogenized thin sheets containing broken tobacco leaves, tobacco dust, and tobacco stem scraps respectively through a roller pressing process, and produce heated cigarettes respectively, which are recorded as HT-CT3, HT-TW3, and HT-TS3 respectively.

[0047] Comparative Example 1: Heated Cigarette

[0048] Take 0.1kg of CT3, 0.1kg of TW3, and 0.15kg of TS3, mix them with 0.25kg of tobacco raw material, 0.25kg of glycerol, 0.03kg of sodium carboxymethyl cellulose, 0.05kg of additional fiber (coniferous wood high-yield pulp), and 0.17kg of water, and prepare a homogenized sheet containing a mixture of chopped tobacco leaves, tobacco dust, and tobacco stem scraps through a roller pressing process, and produce heated cigarettes, which is recorded as Comparative Example 1.

[0049] Elemental analysis experiment

[0050] Using an elemental analyzer, the three scraps (as received) before and after homogenization were characterized and analyzed. The results showed that the difference in elemental composition of the samples was significantly reduced after homogenization.

[0051] Table 2: Elemental analysis results of samples before and after homogenization (as received)

[0052] sample Carbon (wt%) Hydrogen (wt%) Oxygen (wt%)* Nitrogen (wt%) Sulfur (wt%) CT3 40.64 4.86 43.12 2.32 0.23 TS3 42.58 5.07 41.63 2.69 0.34 TW3 43.98 5.78 35.42 2.15 0.32 CT1 41.55 4.42 31.91 2.13 0.21 TS1 44.19 4.46 30.81 2.39 0.30 TW1 44.08 4.97 29.40 2.00 0.19 CT2 42.11 4.12 30.79 2.09 0.20 TS2 44.34 4.19 30.11 2.31 0.28 TW2 44.26 4.47 28.90 1.95 0.18

[0053] *Difference method

[0054] The results in Table 2 are organized into an oxygen-carbon molar ratio-hydrogen-carbon molar ratio graph to obtain the attached Figure 1 .

[0055] From the attached Figure 1 It can be seen that the proportions of carbon, hydrogen and oxygen elements in the discarded broken tobacco leaves, tobacco dust and tobacco stems after homogenization are close, satisfying MAX{CT-H / C, TS-H / C, TW-H / C}≤140%, MAX{CT-O / C, TS-O / C, TW-O / C}≤60%, and MAX{CT-O / C, TS-O / C, TW-O / C}-MIN{CT-O / C, TS-O / C, TW-O / C}≤18%, and the properties tend to be consistent.

[0056] This is because the homogenization process breaks the unstable oxygen- and hydrogen-containing chemical bond structure in the tobacco scraps, causing the tobacco scraps to release light volatile components and moisture. These components are the key ingredients that cause differences in the properties of different types of tobacco scraps.

[0057] Sensory Experiment 1

[0058] Take HT-CT1, HT-TW1, HT-TS1, HT-CT2, HT-TW2, HT-TS2, HT-CT3, HT-TW3, and HT-TS3. The tobacco evaluators use the same heating device to heat and smoke them, and refer to "GB5606.4-2005 Cigarette Part 4 Sensory Technical Requirements", "YC / T 564-2018 Sensory Evaluation Method of Chinese Cigarettes Based on Consumer Experience" and "YC / T 497-2014 Cigarette Chinese Cigarette Style Sensory Evaluation Method" to conduct sensory evaluation on the above heated cigarettes.

[0059] The evaluation results are as follows: the total scores of the six heated cigarettes HT-CT1, HT-TW1, HT-TS1, HT-CT2, HT-TW2, and HT-TS2 prepared from tobacco scraps after homogenization are less than 1 point different, with no significant difference; the total scores of the three heated cigarettes HT-CT3, HT-TW3, and HT-TS3 prepared from tobacco scraps without homogenization are more than 3 points different, with obvious sensory differences.

[0060] It can be seen that homogenization treatment significantly improves the availability of tobacco scraps in the homogenized flake production process. It improves the hydrophobicity of the treated raw materials and reduces the water absorption of the homogenized flakes. At the same time, due to the removal of certain light volatile components, the homogenized flakes produced have a higher concentration of flavor components when smoking, and have a better smoking taste.

[0061] Sensory Experiment 2

[0062] In Examples 17 to 24, three heated cigarettes were randomly selected from each example; three heated cigarettes were randomly selected from Comparative Example 1; and the same heating device was used by the tobacco evaluators for heating and smoking, and the heated cigarettes were subjected to sensory evaluation with reference to GB5606.4-2005 Cigarettes Part 4 Sensory Technical Requirements, YC / T 564-2018 Sensory Evaluation Method for Chinese Cigarettes Based on Consumer Experience, and YC / T 497-2014 Sensory Evaluation Method for Chinese Cigarette Style.

[0063] The evaluation results are as follows: in Examples 17 to 24, three heated cigarettes were randomly selected from each example for smoking, and it was found that there was no significant difference in the sensory experience of the three heated cigarettes; the sensory experience of the three heated cigarettes in Comparative Example 1 was significantly different (the difference in the total score was greater than 2 points). In addition, the sensory experience of Examples 17 to 24 was better than that of Comparative Example 1.

[0064] Example 1 is equivalent to a mixture of tobacco scraps mixed with CT1, TW1, and TS1. It is easy to obtain that the tobacco scrap mixture of Example 1 satisfies MAX{CT-H / C, TS-H / C, TW-H / C}≤140%, and MAX{CT-O / C, TS-O / C, TW-O / C}≤60%, and MAX{CT-O / C, TS-O / C, TW-O / C}-MIN{CT-O / C, TS-O / C, TW-O / C}≤18%, and the properties tend to be consistent.

[0065] Example 2 is equivalent to mixing to obtain a tobacco scrap mixture. It is easy to obtain that the tobacco scrap mixture of Example 2 satisfies MAX{CT-H / C, TS-H / C, TW-H / C}≤140%, and MAX{CT-O / C, TS-O / C, TW-O / C}≤60%, and MAX{CT-O / C, TS-O / C, TW-O / C}-MIN{CT-O / C, TS-O / C, TW-O / C}≤18%, and the properties tend to be consistent.

[0066] Example 3 has higher preparation efficiency and less energy consumption.

[0067] The tobacco scrap mixture in Examples 3, 4, 5, and 6 also includes at least one of waste fresh tobacco leaves, fireworks, and tobacco straw, and has similar chemical properties to the tobacco scrap mixture in Example 1 and can produce the same technical effects. It can be seen that the heat treatment process of the present invention has a wide range of applications.

[0068] The pulverization treatment in Example 7 is after the heat treatment process. The physical properties such as moisture content of the heat-treated scraps change, making them easier to crush. The crushing process has low energy consumption and good crushing effect.

[0069] The crushed particle size in Example 8 is relatively large, and the mixing uniformity of the slurry is slightly poor when used to prepare thin sheets, and the destruction effect of the fiber and cell structure inside the tobacco powder is slightly poor, but the crushing is faster and the energy consumption of the crushing process is low.

[0070] In summary, when the tobacco scrap mixture is further used in the production of homogenized sheets, the diversity of raw material types will not have a significant impact on the stability of the quality of the homogenized sheets, which significantly improves the availability of tobacco scraps in the homogenized sheet production process. Homogenization treatment includes a low-temperature and low-oxygen heat treatment process, which can slightly crack and remove the light volatile components in the tobacco material. The main reaction is the breakage of some oxygen-containing functional groups, which significantly reduces the structure that causes different properties of different tobacco materials; and after the oxygen-containing components in the tobacco material are reduced, the concentration of phenolic and ketone flavor substances in the released smoke will increase, which can further improve the taste of smoking. At the same time, heat treatment can also improve the hydrophobicity of the treated raw materials and reduce the water absorption of the produced homogenized sheets. At the same time, due to the removal of certain light volatile components, the produced homogenized sheets release a higher concentration of flavor components when smoking, and have a better taste of smoking.

[0071] A homogenized tobacco scrap mixture with a sieved particle size within a specific range can effectively improve the mixing uniformity of the slurry when preparing a homogenized thin sheet slurry, and in the appropriate particle size range, the fiber and cell structure inside the tobacco powder can be effectively destroyed, which is conducive to the full release of flavor components during inhalation. A sieved particle size that is too large cannot achieve the effect of improving the mixing uniformity of the slurry and destroying the fiber and cell structure inside the tobacco powder, and a sieved particle size that is too small requires a lot of energy consumption, and the overall economic efficiency of the process is reduced.

[0072] The crushing of tobacco scraps can be done before or after homogenization. Directly carrying out a low-temperature and low-oxygen heat treatment process can change the physical properties of the tobacco scraps, making them easier to crush and reducing the energy consumption of the crushing process.

[0073] When performing low-temperature and low-oxygen heat treatment, the stacking thickness of broken tobacco leaves, tobacco stems and tobacco dust is less than 2cm, or the heat treatment process continuously stirs the scrap powder. These operation steps can avoid uneven heating and uneven homogenization reaction caused by it, and at the same time avoid the accumulation of heat inside the powder during the heat treatment process, resulting in excessive local heat and even spontaneous combustion. Heat treatment in the temperature range provided by the present invention can break the active groups in the tobacco scraps and effectively homogenize the properties. Too high a temperature will increase the loss of flavor components, while too low a temperature will make the homogenization reaction insufficient. When the treatment temperature is high, the homogenization time should be shorter, and when the heat treatment temperature is low, the homogenization time should be longer. In a preferred embodiment, the treatment time is controlled according to the exhaust gas composition; the concentration of at least one of the three gases H2, CH4 and CO in the gas generated by the low-temperature and low-oxygen heat treatment is monitored (the detection equipment can be a flue gas analyzer or a coal gas analyzer). When the concentrations of the above-mentioned gases detected all decrease, the low-temperature and low-oxygen heat treatment is stopped, and the temperature is lowered and cooled. It is beneficial to ensure that the degree of heat treatment is sufficient and save energy by monitoring and accurately controlling the reaction time. The processing atmosphere can also be adjusted: a small amount of oxygen can reduce the activation energy of the mild cracking and removal reaction of light volatile components in the homogenization process, promote the decomposition of tobacco materials, reduce the temperature required for the reaction, and increase the reaction rate, thereby reducing process costs; while excessive oxidizing properties will lead to an increase in the loss of small molecule aroma components in the scraps during the homogenization process, reducing its quality as a raw material for homogenized sheets.

[0074] Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. A homogenized tobacco scrap mixture comprising: Broken tobacco leaves, tobacco stems and tobacco dust, characterized in that the broken tobacco leaves, tobacco stems and tobacco dust are homogenized and meet the following conditions: MAX{CT-H / C,TS-H / C,TW-H / C}≤140%, and MAX{CT-O / C,TS-O / C,TW-O / C}≤60%, Among them, CT-H / C is the molar ratio of hydrogen and carbon elements in the crushed tobacco leaves, CT-O / C is the molar ratio of oxygen and carbon elements in the crushed tobacco leaves, TS-H / C is the molar ratio of hydrogen and carbon elements in the tobacco stems, TS-O / C is the molar ratio of oxygen and carbon elements in the tobacco stems, TP-H / C is the molar ratio of hydrogen and carbon elements in the tobacco dust, and TP-O / C is the molar ratio of oxygen and carbon elements in the tobacco dust.

2. The homogenized tobacco scrap mixture according to claim 1, characterized in that: satisfy: MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤18%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤15%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤12%, MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤10%, or MAX{CT-O / C,TS-O / C,TW-O / C}-MIN{CT-O / C,TS-O / C,TW-O / C}≤8%.

3. The homogenized tobacco scrap mixture according to claim 1, characterized in that: The homogenization process comprises: Step A: subjecting the shredded tobacco leaves, the tobacco stems and the tobacco dust to low-temperature and low-oxygen heat treatment; Step B: After cooling, the homogenized tobacco scrap mixture is obtained.

4. The homogenized tobacco scrap mixture according to claim 3, characterized in that: The sieved particle size of the homogenized tobacco scrap mixture is 30-60 microns, 60-120 microns, 120-200 microns, or 200-300 microns.

5. The homogenized tobacco scrap mixture according to claim 3, characterized in that: The treatment temperature of the low-temperature and low-oxygen heat treatment is 150-170°C, 170-190°C, 190-230°C, or 230-250°C.

6. The homogenized tobacco scrap mixture according to claim 3, characterized in that: The treatment time of the low-temperature and low-oxygen heat treatment is 0.5 to 1 hour, 1 to 2 hours, or 2 to 4 hours.

7. The homogenized tobacco scrap mixture according to claim 3, characterized in that: The processing atmosphere of the low-temperature and low-oxygen heat treatment is an inert atmosphere or a weakly oxidizing atmosphere; the oxygen concentration of the processing atmosphere is 0-0.1 vol%, 0.1-1.0 vol%, 1.0-2.0 vol%, or 2.0-4.0 vol%; the protective gas of the processing atmosphere is nitrogen, argon and / or carbon dioxide.

8. The homogenized tobacco scrap mixture according to claim 1, characterized in that: The homogenized tobacco scrap mixture further comprises one or more of fireworks, cigarette sticks and / or waste containing tobacco components that have been homogenized.

9. A homogenized sheet made from a homogenized sheet raw material comprising the homogenized tobacco scrap mixture according to any one of claims 1 to 8.

10. The homogenized sheet according to claim 9, characterized in that The homogenized flake raw material is composed of the following:

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