Patent Application
20230068565
The present invention belongs to the technical field of low-harm cigarettes, and particularly relates to a low-harm cigarette subjected to smoke enhancement.
For the health of consumers, the tobacco industry has been promoting harm reduction and tar reduction of cigarette products for many years. The tar content of traditional cigarettes has dropped from more than 20 mg to about 10 mg year by year, but lower harm and better satisfaction are often a pair of contradictions. 3 mg tar cigarettes are a kind of cigarettes that are less harmful to human health, with a drawback of small smoke amount on the senses. The cigarettes with tar contents of above 6 mg are relatively good in smoke amount, but their harm increases accordingly.
Therefore, it is necessary to develop a new type of low-harm cigarette subjected to smoke enhancements, which further improve the smoking effect of cigarettes on the basis of low-harm cigarettes, reduce the negative effects of smoke enhancing agents, and extend the shelf life of cigarettes.
One of the objectives of the present invention is to provide a new low-harm cigarette subjected to smoke enhancement, which further improves the smoking effect of cigarettes on the basis of low-harm cigarettes and reduces the negative effects of smoke enhancing agents; and the second objective of the present invention is to extend the shelf life of cigarettes.
In order to solve the above technical problems, this patent adopts the following technical solution:
A low-harm cigarette subjected to smoke enhancement, including cigarette paper, a filter tip, and an aerosol generating substrate, wherein the aerosol generating substrate includes a tobacco sheet subjected to smoke enhancement and/or tobacco shreds subjected to smoke enhancement.
Further, raw materials for manufacturing the tobacco sheet subjected to smoke enhancement include traditional tobacco sheet slurry and a smoke enhancing agent. In the present invention, when the tobacco sheet subjected to smoke enhancement is manufactured, the traditional tobacco sheet slurry and smoke enhancing agent can be used as the raw materials of the tobacco sheet, thereby reducing the difficulty in adjusting the senses such as taste and aroma of the tobacco sheet, shortening the development cycle, and also simplifying the production process.
Further, the cigarette tar emission corresponding to the tobacco sheet directly manufactured from the traditional tobacco sheet slurry is less than or equal to 6 mg/cig, preferably less than or equal to 3 mg/cig, and more preferably less than or equal to 1 mg/cig. In the present invention, the tobacco sheet with low tar content can also produce smoke equivalent to that of the tobacco sheet with high tar content by smoke enhancing treatment based on the traditional tobacco sheet, thereby achieving the technical effect of meeting customer's requirement for smoke amount on the premise of low harm.
Further, the smoke enhancing agent has a mass percentage of greater than or equal to 5% in the tobacco sheet subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is greater than or equal to 5%, a relatively obvious smoke enhancing effect on the sense can be produced; and because the consumption of the smoke enhancing agent is very low, the smoke enhancing agent brings little harm and has a little impact on the senses such as taste and aroma of the tobacco sheet, and the senses such as taste and aroma of the tobacco sheet do not need to be adjusted, which greatly shortens the development cycle and increases the cost of cigarettes little.
Further, the smoke enhancing agent has a mass percentage of greater than or equal to 10% in the tobacco sheet subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is greater than or equal to 10%, a very obvious smoke enhancing effect on the sense can be produced; and because the consumption of the smoke enhancing agent is relatively low, the smoke enhancing agent brings relatively low harm and has a relatively small impact on the senses such as taste and aroma of the tobacco sheet, and the difficulty in adjusting the senses such as taste and aroma of the tobacco sheet is relatively low, which can shorten the development cycle and increases the cost of cigarettes a little.
Further, the smoke enhancing agent has a mass percentage of less than or equal to 25% in the tobacco sheet subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco sheet subjected to smoke enhancement reaches 25%, the smoke enhancing effect is close to the limit; if the mass percentage of the smoke enhancing agent is further increased, it is difficult to find further smoke enhancing effects on the senses; and on the other hand, because the consumption of the smoke enhancing agent is too high, the smoke enhancing agent will also have a greater impact on the senses such as taste and aroma of the tobacco sheet, the difficulty in adjusting the senses such as taste and aroma of the tobacco sheet will be greatly increased, and the cost of cigarettes will be significantly increased.
Further, the smoke enhancing agent has a mass percentage of less than or equal to 20% in the tobacco sheet subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is less than or equal to 20%, the smoke enhancing effect is relatively significant, and the addition of the smoke enhancing agent has a relatively high cost performance.
Further, the smoke enhancing agent has a mass percentage of between 12.5% and 17.5% in the tobacco sheet subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is between 12.5% and 17.5%, especially 15%, the smoke enhancing effect is significant, the adverse impact caused by the smoke enhancing agent is also within a controllable range, and the addition of the smoke enhancing agent has a very high cost performance.
Further, during the manufacturing of the tobacco sheet subjected to smoke enhancement, the smoke enhancing agent is blended into the traditional tobacco sheet slurry. The smoke enhancing agent is directly blended into the traditional tobacco sheet slurry, and the tobacco sheet subjected to smoke enhancement can be produced directly according to the existing process, without modifying the manufacturing equipment and manufacturing process, and because the smoke enhancing agent is uniformly blended into the traditional tobacco sheet slurry, the surface of the tobacco sheet subjected to smoke enhancement is as smooth as the traditional tobacco sheet.
Further, the smoke enhancing agent is attached to the surface of the tobacco sheet subjected to smoke enhancement. The smoke enhancing agent is directly attached to the surface of the tobacco sheet subjected to smoke enhancement by blending or the like, which is beneficial to improving the atomization effect of the smoke enhancing agent, especially when the cigarette is lighted or heated at a high temperature, the smoke enhancing agent attached to the surface of the tobacco sheet will quickly atomize when exposed to a little heat, thereby further reducing the harm.
Further, the tobacco shreds subjected to smoke enhancement include traditional tobacco shreds and a smoke enhancing agent. In the present invention, when tobacco shreds subjected to smoke enhancement are manufactured, the traditional tobacco shreds and smoke enhancing agent can be used, thereby reducing the difficulty in adjusting the senses such as taste and aroma of the tobacco shreds, shortening the development cycle, and also simplifying the production process.
Further, the cigarette tar emission corresponding to the traditional tobacco shreds is less than or equal to 6 mg/cig, preferably less than or equal to 3 mg/cig, and more preferably less than or equal to 1 mg/cig. In the present invention, the tobacco shreds with low tar content can also produce smoke equivalent to that of the tobacco shreds with high tar content by smoke enhancing treatment based on the traditional tobacco shreds, thereby achieving the technical effect of meeting customer's requirement for smoke amount on the premise of low harm.
Further, the smoke enhancing agent has a mass percentage of greater than or equal to 5% in the tobacco shreds subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is greater than or equal to 5%, a relatively obvious smoke enhancing effect on the sense can be produced; and because the consumption of the smoke enhancing agent is very low, the smoke enhancing agent brings little harm and has a little impact on the senses such as taste and aroma of the tobacco shreds, and the senses such as taste and aroma of the tobacco shreds do not need to be adjusted, which greatly shortens the development cycle and increases the cost of cigarettes little.
Further, the smoke enhancing agent has a mass percentage of greater than or equal to 10% in the tobacco shreds subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is greater than or equal to 10%, a very obvious smoke enhancing effect on the sense can be produced; and because the consumption of the smoke enhancing agent is relatively low, the smoke enhancing agent brings relatively low harm and has a relatively small impact on the senses such as taste and aroma of the tobacco shreds, and the difficulty in adjusting the senses such as taste and aroma of the tobacco shreds is relatively low, which can shorten the development cycle and increases the cost of cigarettes a little.
Further, the smoke enhancing agent has a mass percentage of less than or equal to 25% in the tobacco shreds subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco shreds subjected to smoke enhancement reaches 25%, the smoke enhancing effect is close to the limit; if the mass percentage of the smoke enhancing agent is further increased, it is difficult to find further smoke enhancing effects on the senses; on the other hand, because the consumption of the smoke enhancing agent is too high, the smoke enhancing agent will also have a greater impact on the senses such as taste and aroma of the tobacco shreds, the difficulty in adjusting the senses such as taste and aroma of the tobacco shreds will be greatly increased, and the cost of cigarettes will be significantly increased; and the excessive smoke enhancing agent will also shorten the shelf life of cigarette products.
Further, the smoke enhancing agent has a mass percentage of less than or equal to 20% in the tobacco shreds subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is less than or equal to 20%, the smoke enhancing effect is relatively significant, and the addition of the smoke enhancing agent has a relatively high cost performance.
Further, the smoke enhancing agent has a mass percentage of between 12.5% and 17.5% in the tobacco shreds subjected to smoke enhancement. The present invention found on the basis of a large number of experiments that when the mass percentage of the smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is between 12.5% and 17.5%, especially 15%, the smoke enhancing effect is significant, the adverse impact caused by the smoke enhancing agent is also within a controllable range, and the addition of the smoke enhancing agent has a very high cost performance.
Further, the smoke enhancing agent at least partially permeates into the tobacco shreds subjected to smoke enhancement. The smoke enhancing agent partially permeates into the tobacco shreds subjected to smoke enhancement, so only the smoke enhancing agent needs to be added in the feeding link of the traditional tobacco shred manufacturing process, and the manufacturing equipment and manufacturing process do not need to be modified; and because the smoke enhancing agent permeates into the tobacco shreds subjected to smoke enhancement uniformly, the surface of the tobacco shreds subjected to smoke enhancement is as smooth as that of the traditional tobacco shreds.
Further, the smoke enhancing agent is attached to the surface of the tobacco shreds subjected to smoke enhancement. The smoke enhancing agent is directly attached to the surface of the tobacco shreds subjected to smoke enhancement by blending or the like, which is beneficial to improving the atomization effect of the smoke enhancing agent, especially when the cigarette is lighted or heated at a high temperature, the smoke enhancing agent attached to the surface of the tobacco shreds will quickly atomize when exposed to a little heat, thereby further reducing the harm.
Further, the smoke enhancing agent has a melting point of greater than or equal to 30° C. When the melting point of the smoke enhancing agent is greater than or equal to 30° C., it can remain solid at room temperature, and the overall sense of the cigarette, especially the hand feel, can be kept in a dry state, which is consistent with that of traditional cigarettes. In addition, the dry tobacco sheet and/or tobacco shreds do not weaken the tensile strength of the cigarette paper, so that ordinary cigarette paper can be used for wrapping, instead of high-cost cigarette paper with special wet tensile strength.
Further, the smoke enhancing agent has low deliquescence, so that the yellow spot projection area of the low-harm cigarette subjected to smoke enhancement after placed continuously in an environment of 40° C. and 80% RH for 25 hours is less than 50 mm2/cig. The smoke enhancing agent with low deliquescence can reduce the risk of deliquescence and yellow spots appearing on the outer surface of the cigarette paper due to the strong moisture absorption of the smoke enhancing agent, extend the shelf life of cigarette products, and reduce the occurrence of yellow spot cigarettes. In addition, the humidity control range of the cigarette manufacturing environment can be expanded to 30%-60%, that is, the cigarette does not need to be produced in a special closed dry production workshop, thereby greatly reducing production energy consumption.
Further, the smoke enhancing agent is composed of one or more harmless organic compounds, and the unit tar H value of the low-harm cigarette subjected to smoke enhancement added with the harmless organic compounds is less than or equal to 0.65, or less than or equal to 0.6, or less than or equal to 0.55, or less than or equal to 0.5, or less than or equal to 0.45. Further, the XHCN value is less than or equal to 60 μg/cig; or the XNNK value is less than or equal to 3.0 ng/cig; or the XNH3 value is less than or equal to 6.5 μg/cig; or the XB[a]P value is less than or equal to 8.2 ng/cig; or the Xphenol value is less than or equal to 25 μg/cig; or the Xcrotonaldehyde value is less than or equal to 12.5 μg/cig. Since the smoke enhancing agent is one or more harmless organic compounds, a relatively small amount of harmful substances is produced during combustion reaction or high-temperature decomposition, and the harm evaluation index of the cigarette is relatively low.
Further, the harmless organic compounds include saccharides and/or sugar alcohols. Further, the saccharides and/or sugar alcohols include at least one of butanetetraol, pentitol, and hexanehexol. Since the smoke enhancing agent is selected from commonly used food additives, it is very safe, and even if the cigarette is accidentally eaten, it will not cause serious consequences.
Further, the target tar equivalent of the low-harm cigarette subjected to smoke enhancement is Ttarget·mg/cig, the mass percentage of the tobacco sheet subjected to smoke enhancement in the aerosol generating substrate is Msheet, the mass percentage of the tobacco shreds subjected to smoke enhancement in the aerosol generating substrate is Mtobacco, the raw materials for manufacturing the tobacco sheet subjected to smoke enhancement include traditional tobacco sheet slurry and a first smoke enhancing agent, the cigarette tar emission corresponding to the tobacco sheet directly manufactured from the traditional tobacco sheet slurry is Tsheet·mg/cig, the mass percentage of the first smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is Msmoke1, the smoke enhancing coefficient of the first smoke enhancing agent is S1, the limit smoke enhancing tar equivalent of the first smoke enhancing agent is Tlimit1, the smoke enhancing agent content corresponding to the limit smoke enhancing tar equivalent of the first smoke enhancing agent is Mlimit1, the tobacco shreds subjected to smoke enhancement include traditional tobacco shreds and a second smoke enhancing agent, the cigarette tar emission corresponding to the traditional tobacco shreds is Ttobacco·mg/cig, the mass percentage of the second smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is Msmoke2, the smoke enhancing coefficient of the second smoke enhancing agent is S2, the limit smoke enhancing tar equivalent of the second smoke enhancing agent is Tlimit2, the smoke enhancing agent content corresponding to the limit smoke enhancing tar equivalent of the second smoke enhancing agent is Mlimit2, and the above parameters satisfy the following relationship within an error of ±5%:
T
target
=M
sheet×(Tsheet+Tlimit1−S1×(Mlimit1−Msmoke1)2)+Mtobacco×(Ttobacco+Tlimit2−S2×(Mlimit2−Msmoke2)2).
Through the above formula, the tar equivalent of the whole cigarette can be obtained, which facilitates the calculation on the content of the smoke enhancing agent added to the tobacco sheet and the tobacco shreds during the development of cigarettes, and also facilitates the marking of the tar equivalent on cigarette product packages, so that customers can select cigarette products with required smoke amount.
Further, the aerosol generating substrate includes only a tobacco sheet subjected to smoke enhancement, the raw materials for manufacturing the tobacco sheet subjected to smoke enhancement include traditional tobacco sheet slurry and a smoke enhancing agent, and the total particulate material produced by the low-harm cigarette heated by a heating cigarette utensil at 200° C. is greater than or equal to 14.0 mg. The total particulate material produced by the low-harm cigarette subjected to smoke enhancement heated at 200° C. may be greater than or equal to 14.0 mg, which meets consumer's requirement for smoke. When the low-harm cigarette subjected to smoke enhancement is heated at 200° C., harmful substances produced, such as aldehydes and ketones, are significantly lower than those when heated at 240° C.
Further, the aerosol generating substrate includes only tobacco shreds subjected to smoke enhancement, the tobacco shreds subjected to smoke enhancement include traditional tobacco shreds and a smoke enhancing agent, and the smoke enhancing agent has a boiling point of less than or equal to 350° C. When the aerosol generating substrate includes only the tobacco shreds subjected to smoke enhancement, the low-harm cigarette subjected to smoke enhancement can serve as a combustion type cigarette for lighted puffing. When the boiling point of the smoke enhancing agent is less than or equal to 350° C. the actual atomization amount of the cigarette can be increased, while the combustion reaction is avoided as much as possible.
Further, the aerosol generating substrate includes both a tobacco sheet subjected to smoke enhancement and tobacco shreds subjected to smoke enhancement. When the aerosol generating substrate includes both the tobacco sheet subjected to smoke enhancement and the tobacco shreds subjected to smoke enhancement, the low-harm cigarette subjected to smoke enhancement can serve as a dual-use cigarette that is suitable for lighted puffing and heating puffing conducted by a heating cigarette utensil. On the one hand, the dual-use cigarette can be heated and puffed with a heating cigarette utensil, which eliminates the trouble that a lighter cannot be carried on an airplane. On the other hand, it can be directly lighted and puffed, and can be easily shared with relatives and friends like ordinary cigarettes, with relatively strong communicative function.
Further, the mass ratio of the tobacco sheet subjected to smoke enhancement to the tobacco shreds subjected to smoke enhancement is between 1:9 and 9:1. The quality ratio of the tobacco sheet subjected to smoke enhancement to the tobacco shreds subjected to smoke enhancement is between 1:9 and 9:1, so that different cigarette tastes and aromas can be adjusted and blended, and consumers can also choose suitable dual-use cigarettes according to daily consumption habits and the frequency of lighted puffing and heating puffing.
Further, the total particulate material produced by the low-harm cigarette subjected to smoke enhancement heated by a heating cigarette utensil at 200° C. is greater than or equal to 14.0 mg. The total particulate material produced by the low-harm cigarette subjected to smoke enhancement heated at 200° C. may be greater than or equal to 14.0 mg, which meets consumer's requirement for smoke. When the low-harm cigarette subjected to smoke enhancement is heated at 200° C., the amount of harmful substances produced, such as aldehydes and ketones, is significantly lower than that when heated at 240° C.
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 drawings are only examples of the technical solutions requested to be protected.
The following describes the features and advantages of this patent in detail in specific embodiments, which enable those skilled in the art to understand and implement the technical content of this patent. According to the description, claims and drawings, those skilled in the art can easily understand the objectives and advantages of this patent.
A low-harm cigarette subjected to smoke enhancement of the present invention includes cigarette paper, a filter tip, and an aerosol generating substrate. The aerosol generating substrate includes a tobacco sheet subjected to smoke enhancement and/or tobacco shreds subjected to smoke enhancement.
The first method of manufacturing a tobacco sheet subjected to smoke enhancement: the tobacco sheet subjected to smoke enhancement is manufactured according to the existing process for traditional tobacco sheets, except that a smoke enhancing agent is directly blended into traditional tobacco sheet slurry during the manufacturing of the tobacco sheet subjected to smoke enhancement, that is, the following steps are performed:
Step 1: traditional tobacco sheet slurry is prepared according to the traditional slurry process of manufacturing a tobacco sheet or the like;
Step 2: an appropriate amount of smoke enhancing agent is added to the traditional tobacco sheet slurry;
Step 3: the tobacco sheet subjected to smoke enhancement is manufactured according to the traditional slurry process or the like.
Because the method can directly manufacture the tobacco sheet subjected to smoke enhancement according to the existing process, the manufacturing equipment and manufacturing process do not need to be modified. In addition, because the smoke enhancing agent is uniformly blended into the traditional tobacco sheet slurry, the surface of the tobacco sheet subjected to smoke enhancement is as smooth as the traditional tobacco sheet, and the tobacco sheet subjected to smoke enhancement is not easily exposed to moisture in air to get damp.
The second method of manufacturing a tobacco sheet subjected to smoke enhancement: after a traditional tobacco sheet is manufactured according to the existing process for traditional tobacco sheets, a smoke enhancing agent is attached to the surface of the tobacco sheet subjected to smoke enhancement, that is, the following steps are performed:
Step 1: traditional tobacco sheet slurry is prepared according to the traditional slurry process of manufacturing a tobacco sheet or the like;
Step 2: a traditional tobacco sheet is manufactured according to the traditional slurry process or the like;
Step 3: an appropriate amount of smoke enhancing agent is directly blended into the traditional tobacco sheet to obtain a tobacco sheet subjected to smoke enhancement. It can be observed that the smoke enhancing agent is attached to the surface of the tobacco sheet subjected to smoke enhancement.
The smoke enhancing agent is directly attached to the surface of the tobacco sheet subjected to smoke enhancement by direct blending or the like, which is beneficial to improving the atomization effect of the smoke enhancing agent, especially when the cigarette is lighted or heated at a high temperature, the smoke enhancing agent attached to the surface of the tobacco sheet will quickly atomize when exposed to a little heat, thereby further reducing the harm.
The first method of manufacturing tobacco shreds subjected to smoke enhancement: the tobacco shreds subjected to smoke enhancement are manufactured according to the existing process for tobacco shreds, except direct permeation into the inside of the tobacco shreds during the manufacturing of the tobacco shreds subjected to smoke enhancement, that is, the following steps are performed:
Step 1: traditional tobacco shreds are pre-treated according to the traditional process of manufacturing tobacco shreds;
Step 2: an appropriate amount of osmotic smoke enhancing agent solution is sprayed to the traditional tobacco shreds;
Step 3: treatments such as drying are continued according to the traditional process of manufacturing tobacco shreds to manufacture tobacco shreds subjected to smoke enhancement.
Because the smoke enhancing agent directly permeates into the tobacco shreds subjected to smoke enhancement in this method, only the smoke enhancing agent needs to be added in the feeding link of the traditional tobacco shred manufacturing process, and the manufacturing equipment and manufacturing process do not need to be modified. Because the smoke enhancing agent permeates into the tobacco shreds subjected to smoke enhancement uniformly, the surface of the tobacco shreds subjected to smoke enhancement is as smooth as that of the traditional tobacco shreds, and the tobacco shreds subjected to smoke enhancement are not easily exposed to moisture in air to get damp.
The second method of manufacturing tobacco shreds subjected to smoke enhancement: the tobacco shreds subjected to smoke enhancement are manufactured according to the existing process for tobacco shreds, except direct attachment to the surface of the tobacco shreds by blending or the like during the manufacturing of the tobacco shreds subjected to smoke enhancement, that is, the following steps are performed:
Step 1: traditional tobacco shreds are pre-treated according to the traditional process of manufacturing tobacco shreds;
Step 2: treatments such as drying are continued according to the traditional process of manufacturing tobacco shreds;
Step 3: an appropriate amount of smoke enhancing agent is directly blended into the traditional tobacco shreds to obtain tobacco shreds subjected to smoke enhancement. It can be observed that the smoke enhancing agent is attached to the surface of the tobacco shreds subjected to smoke enhancement.
In this method, the smoke enhancing agent is directly attached to the surface of the tobacco shreds by blending or the like, which is beneficial to improving the atomization effect of the smoke enhancing agent, especially when the cigarette is lighted or heated at a high temperature, the smoke enhancing agent attached to the surface of the tobacco shreds will quickly atomize when exposed to a little heat, and most of the smoke enhancing agent does not undergo combustion reaction or high-temperature decomposition, thereby further reducing the harm.
The tobacco sheet subjected to smoke enhancement manufactured in Embodiment 1 and 2 is appropriately selected as an aerosol generating substrate according to the requirements of taste, aroma, tar equivalent of the whole cigarette, etc., the tobacco sheet is shredded or curled according to the traditional method of manufacturing cigarettes and wrapped with cigarette paper and a filter tip, additional structures such as a cooling section and popping beads may also be added if necessary, and therefore, a low-harm heating cigarette subjected to smoke enhancement is formed.
The tobacco shreds subjected to smoke enhancement manufactured in Embodiment 3 and 4 are appropriately selected as an aerosol generating substrate according to the requirements of taste, aroma, tar equivalent of the whole cigarette, etc., the tobacco shreds are wrapped with cigarette paper and a filter tip according to the traditional method of manufacturing cigarettes, additional structures such as popping beads may also be added if necessary, and therefore, a low-harm burning cigarette subjected to smoke enhancement is formed.
The tobacco sheet subjected to smoke enhancement and the tobacco shreds subjected to smoke enhancement manufactured in Embodiments 1-4 are appropriately selected as an aerosol generating substrate according to the requirements of taste, aroma, tar equivalent of the whole cigarette, etc., the tobacco sheet is shredded or curled according to the traditional method of manufacturing cigarettes, blended with the tobacco shreds and then wrapped with cigarette paper and a filter tip, additional structures such as a cooling section or popping beads may also be added if necessary, and therefore, a low-harm dual-use cigarette subjected to smoke enhancement is formed.
When a smoke enhancing agent with low deliquescence is used, the humidity control range of the manufacturing environment in the above Embodiments 1-7 can be expanded to 30%-60%, that is, the cigarette does not need to be produced in a special closed dry production workshop, thereby greatly reducing production energy consumption.
A commonly used means to characterize the amount of cigarette smoke is Total Particulate Material (TPM). The experiment can be conducted according to the method provided in GB/T 19609-2004 Cigarette—Determination of total particulate material and tar using a routine analytical smoking machine, to obtain a total particulate material production per unit weight of tobacco material (mg/cig).
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are 3 mg of tobacco shreds blown out from Zhongnanhai cigarettes, and the sprayed smoke enhancing agent solution is a 50% butanetetraol aqueous solution. The dosage of the smoke enhancing agent solution is adjusted to obtain 5 kinds of tobacco shreds subjected to smoke enhancement with 5%, 10%, 15%, 20% and 25% butanetetraol content, relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement.
The above-mentioned traditional tobacco shreds and the 5 kinds of tobacco shreds subjected to smoke enhancement are respectively wrapped into cigarettes according to the manufacturing method in Embodiment 6.
First, cigarette evaluators evaluate the senses by means of lighted puffing according to GB5606.4-2005 and sensory evaluation methods of Chinese cigarettes. The results show that, compared with the traditional low-harm cigarettes that are not added with any smoke enhancing agent, the 5 kinds of low-harm cigarette subjected to smoke enhancements have lower choking feel, nasal irritation and dryness, slightly unclean aftertaste, and slightly insufficient aroma permeability.
Second, the total particulate material in mainstream smoke of the cigarettes is measured according to the method of GB/T 19609-2004. The specific results are shown in
It can be seen that the total particulate material increases with the increase of the mass percentage of butanetetraol as a smoke enhancing agent in the tobacco shreds, but the increase rate gradually decreases, and a diminishing marginal effect occurs; and when the mass percentage of the smoke enhancing agent reaches 25%, the smoke enhancing effect is close to the limit, even if the mass percentage of the smoke enhancing agent is further increased, it is difficult to see further smoke enhancing effects.
Especially in the case of 15% butanetetraol content, the TPM value of the total particulate material of smoke captured by a Cambridge filter is 8.80, while the TPM value of traditional tobacco shreds with 0% butanetetraol content is 5.08, so the increase reaches 73.2%, and the smoke enhancing effect is significant.
Another commonly used means to characterize the amount of cigarette smoke is infrared shading rate. The infrared shading rate of a sample can be measured by means of lighted puffing on a smoking machine according to the Canadian deep puffing mode. The larger the value is, the higher the concentration of smoke is.
Traditional low-harm cigarettes and low-harm cigarette subjected to smoke enhancements with 15% butanetetraol content are manufactured according to the method of Embodiment 8, and their infrared shading rates are respectively measured by means of lighted puffing on a smoking machine according to the Canadian deep puffing mode (puffing time is set to 3 seconds).
The larger the value in Table 1 is the higher the concentration of smoke is. The actual amount of smoke can thus be seen. Obviously, the amount of smoke of the sample added with butanetetraol as a smoke enhancing agent is much higher than that of the sample not added with butanetetraol.
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are 3 mg of tobacco shreds blown out from Zhongnanhai cigarettes, and the sprayed smoke enhancing agent solution is a 50% pentitol aqueous solution. The dosage of the smoke enhancing agent solution is adjusted to obtain 5 kinds of tobacco shreds subjected to smoke enhancement with 5%, 10%, 15%, 20% and 25% pentitol content, relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement.
The above-mentioned traditional tobacco shreds and the 5 kinds of tobacco shreds subjected to smoke enhancement are respectively wrapped into cigarettes according to the manufacturing method in Embodiment 6.
First, cigarette evaluators evaluate the senses by means of lighted puffing according to GB5606.4-2005 and sensory evaluation methods of Chinese cigarettes. The results show that, compared with the traditional low-harm cigarettes that are not added with any smoke enhancing agent, the 5 kinds of low-harm cigarette subjected to smoke enhancements have lower choking feel, nasal irritation and dryness, slightly unclean aftertaste, and slightly insufficient aroma permeability.
Second, the total particulate material in mainstream smoke of the cigarettes is measured according to the method of GB/T 19609-2004. The specific results are shown in
It can be seen that the total particulate material increases with the increase of the mass percentage of pentitol as a smoke enhancing agent in the tobacco shreds, but the increase rate gradually decreases, and a diminishing marginal effect occurs; and when the mass percentage of the smoke enhancing agent reaches 25%, the smoke enhancing effect is close to the limit, even if the mass percentage of the smoke enhancing agent is further increased, it is difficult to see further smoke enhancing effects.
Especially in the case of 15% pentitol content, the TPM value of the total particulate material of smoke captured by a Cambridge filter is 8.99, while the TPM value of traditional tobacco shreds with 0% pentitol content is 5.08, so the increase reaches 77.0%, and the smoke enhancing effect is significant.
Traditional low-harm cigarettes and low-harm cigarette subjected to smoke enhancements with 15% pentitol content are manufactured according to the method of Embodiment 10, and their infrared shading rates are respectively measured by means of lighted puffing on a smoking machine according to the Canadian deep puffing mode (puffing time is set to 3 seconds).
The larger the value in Table 2 is, the higher the concentration of smoke is. The actual amount of smoke can thus be seen. Obviously, the amount of smoke of the sample added with pentitol as a smoke enhancing agent is much higher than that of the sample not added with butanetetraol.
In addition to the above-mentioned butanetetraol and pentitol, polyol materials of saccharides and sugar alcohols such as butantriol, pentanetriol, pentaerythritol, hexanetriol, hexanetetrol, hexanepentol, hexanehexol, heptanetetrol, heptanepentol, heptanehexol, and volemitol all show smoke enhancing effects.
As the smoke enhancing agent of the low-harm cigarette, harmless organic compounds are preferred, so that the unit tar H value of the low-harm cigarette subjected to smoke enhancement added with the smoke enhancing agent is less than or equal to 0.6, then it can be considered that the harm of the cigarette is at a relatively low level. The unit tar H value=H value/tar content or equivalent. If the smoke enhancing agent is further selected from common food additives of saccharides and sugar alcohols such as butanetetraol, pentitol, and hexanehexol, the safety will be higher, and even if the cigarette is accidentally eaten, it will not cause serious consequences.
H value is a cigarette harm evaluation index, and is calculated according to the following formula:
In the formula:
H is a cigarette harm evaluation index;
XCO is a measured value of CO emission in mainstream cigarette smoke, mg/cig;
XHCN is a measured value of HCN emission in mainstream cigarette smoke, μg/cig;
XNNK is a measured value of NNK emission in mainstream cigarette smoke, ng/cig;
XNH3 is a measured value of NH3 emission in mainstream cigarette smoke, μg/cig;
XB[a]P is a measured value of benzo(a)pyrene emission in mainstream cigarette smoke, ng/cig;
Xphenol is a measured value of phenol emission in mainstream cigarette smoke, μg/cig;
Xcrotonaldehyde is a measured value of crotonaldehyde emission in mainstream cigarette smoke, μg/cig;
XCO, XHCN, XNNK, XNH3, XB[a]P, Xphenol, and Xcrotonaldehyde are respectively weighted averages of emissions in mainstream smoke of national cigarettes.
The measurement of CO in samples follows YC/T30-1996 standards; the measurement of HCN follows YC/T253-2008 standards; the measurement of NNK follows GB/T23228-2008 standards; the measurement of NH3 follows tobacco industry standards; the measurement of benzo(a)pyrene follows GB/T21130-2007 standards; the measurement of phenol follows YC/T255-2008 standards; and the measurement of crotonaldehyde follows YC/T254-2008 standards.
The tar content of traditional cigarettes refers to a total particulate material after nicotine and moisture are removed, in units of mg. The tar content has a positive relationship with the amount of cigarette atomization. The higher the tar content is, the larger the amount of cigarette atomization is. However, in traditional cigarettes, all the tar is usually regarded as a harmful substance produced by cigarettes, while the low-harm cigarette subjected to smoke enhancement in the present invention actually has relatively low tar content, but in order to compare its atomization amount with that of traditional cigarettes, the concept of tar equivalent is defined, that is, the tar equivalent of the low-harm cigarette subjected to smoke enhancement refers to a total particulate material after nicotine and moisture are removed, in units of mg. The specific measurement method may refer to the method of measuring tar in mainstream cigarette smoke in GB/T 19609-2004.
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are tobacco shreds of single-material cigarettes Hunan XiangxiLongshan C3F, and the sprayed smoke enhancing agent solutions are respectively a 50% butanetetraol aqueous solution, a 50% pentitol aqueous solution, and a 50% hexanehexol aqueous solution. The dosages of the smoke enhancing agent solutions are respectively adjusted to obtain 3 kinds of tobacco shreds subjected to smoke enhancement with 15% butanetetraol content 15% pentitol content, and 15% hexanehexol content, relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement.
The tobacco shreds are sequentially wrapped into traditional cigarettes and low-harm cigarette subjected to smoke enhancements with 15% butanetetraol content, 15% pentitol content, and 15% hexanehexol content according to the manufacturing method in Embodiment 6. The cigarette harm evaluation indexes of the above cigarettes are respectively measured according to the above method.
It can be seen from Table 3 that the unit tar H values of cigarettes added with butanetetraol, pentitol, and hexanehexol as smoke enhancing agents are all less than or equal to 0.65, which is significantly better than that of traditional cigarettes. Further, the unit tar H values are all less than or equal to 0.6, or less than or equal to 0.55, or less than or equal to 0.5, or less than or equal to 0.45; further, the XHCN values are less than or equal to 60 μg/cig; or the XNNK values are less than or equal to 3.0 ng/cig; or the XNH3 values are less than or equal to 6.5 μg/cig; or the XB[a]P values are less than or equal to 8.2 ng/cig; or the Xphenol values are less than or equal to 25 μg/cig; or the Xcrotonaldehyde values are less than or equal to 12.5 μg/cig; therefore, it can be considered that the harm of the cigarettes is at a relatively low level.
The shelf life of cigarettes mainly depends on the moisture absorption of cigarette products. For example, electrically heated aerosol generating products usually include a large amount of high deliquescent propylene glycol and glycerol, and thus have higher moisture content than conventional tobacco shred cigarettes. This will greatly shorten the shelf life of such electrically heated aerosol generating products. Moreover, due to the relatively large specific heat of water, the heating temperature of cigarette utensils must be increased for the electrically heated aerosol generating products including high deliquescent materials, which increases the cracking of organic matters to generate harmful substances. Conventional tobacco shred cigarettes cannot be added with high deliquescent substances, otherwise, the flammability and continuous burning of the cigarettes will be reduced. Therefore, smoke enhancing agents with low deliquescence are preferred during the smoke enhancing treatment for cigarettes.
The deliquescence of smoke enhancing agents can be obtained in the following way: 15.000±0.004 g samples are weighed and placed in a 40° C. and 80% RH constant temperature and humidity incubator, and the water absorption and weight gain of the samples at different time are investigated.
The deliquescence of the smoke enhancing agent may be determined by calculating a weight gain percentage within 120 min. If the weight gain percentage within 120 min is less than or equal to 8%, it can be considered that the cigarette has low deliquescence; if the weight gain percentage within 120 min is less than or equal to 5%, it can be considered that the cigarette has very low deliquescence; if the weight gain percentage within 120 min is less than or equal to 1%, it can be considered that the cigarette has ultra-low deliquescence.
Traditional low-harm cigarettes and low-harm cigarette subjected to smoke enhancements with 15% butanetetraol content are manufactured according to the method of Embodiment 8. Low-harm cigarette subjected to smoke enhancements with 15% pentitol content are manufactured according to the method of Embodiment 10.
3 mg of tobacco shreds blown out from Zhongnanhai cigarettes are sprayed glycerol to obtain a control tobacco shred sample with 15% glycerol content by final tobacco shred mass, and the control tobacco shred sample is wrapped into a control cigarette sample according to the manufacturing method in Embodiment 6. The manufacturing process should be carried out in a special closed dry laboratory to ensure that the cigarettes are not deliquescent and have no yellow spots before the experiment.
As shown in
It can be seen from Table 5 that, due to the low deliquescence of the butanetetraol and pentitol used, the yellow spot area of the cigarettes is still less than 50 mm2/cig after continuously placed in an environment of 40° C. and 80% RH for 25 hours. In addition to the above-mentioned cigarettes including tobacco shreds, cigarettes including tobacco sheets treated with low-deliquescent smoke enhancing agents such as butanetetraol and pentitol also have relatively long shelf life. In addition, cigarettes using low-deliquescent smoke enhancing agents such as butanetetraol and pentitol do not need to be manufactured in a special closed dry environment.
The tar content of traditional cigarettes refers to a total particulate material after nicotine and moisture are removed, in units of mg. The tar content has a positive relationship with the amount of cigarette atomization. The higher the tar content is, the larger the amount of cigarette atomization is. However, in traditional cigarettes, all the tar is usually regarded as a harmful substance produced by cigarettes, while the low-harm cigarette subjected to smoke enhancement in the present invention actually has relatively low tar content, but in order to compare its atomization amount with that of traditional cigarettes, the concept of tar equivalent is defined, that is, the tar equivalent of the low-harm cigarette subjected to smoke enhancement refers to a total particulate material after nicotine and moisture are removed, in units of mg. The specific measurement method may refer to the method of measuring tar in mainstream cigarette smoke in GB/T 19609-2004.
Traditional low-harm cigarettes and 5 kinds of low-harm cigarette subjected to smoke enhancements with 5%, 10%, 15%, 20% and 25% butanetetraol content are manufactured according to the method of Embodiment 8. Referring to the method of measuring tar in mainstream cigarette smoke in GB/T 19609-2004, the tar content of the traditional low-harm cigarettes and the tar equivalents of the 5 kinds of low-harm cigarette subjected to smoke enhancements are respectively measured. The specific results are shown in
It can be seen from
5.75 may be defined as the limit smoke enhancing tar equivalent Tlimit of the smoke enhancing agent, 47.143 may be defined as the smoke enhancing coefficient S of the smoke enhancing agent, and 24.32% may be defined as the smoke enhancing agent content Mlimit corresponding to the limit smoke enhancing tar equivalent of the smoke enhancing agent.
In addition to the tobacco shreds and smoke enhancing agents used in the above experiments, tobacco sheets and other smoke enhancing agents also exhibit the above rules, and they all satisfy the quadratic function relationship within an error of ±5% after careful verification. Therefore, during the design and development of cigarette products, the tar equivalent of the whole cigarette can be obtained by the following formula. On the one hand, it is convenient to calculate the content of the smoke enhancing agent added to the tobacco sheet and the tobacco shreds during the development of cigarettes. On the other hand, the tar equivalent can be marked on cigarette product packages, so that customers can select cigarette products with required smoke amount.
The target tar equivalent of the low-harm cigarette subjected to smoke enhancement is Ttarget·mg/cig,
The mass percentage of the tobacco sheet subjected to smoke enhancement in the aerosol generating substrate is Msheet,
The mass percentage of the tobacco shreds subjected to smoke enhancement in the aerosol generating substrate is Mtobacco,
The raw materials for manufacturing the tobacco sheet subjected to smoke enhancement include traditional tobacco sheet slurry and a first smoke enhancing agent, the cigarette tar emission corresponding to the tobacco sheet directly manufactured from the traditional tobacco sheet slurry is Tsheet·mg/cig, the mass percentage of the first smoke enhancing agent in the tobacco sheet subjected to smoke enhancement is Msmoke1, the smoke enhancing coefficient of the first smoke enhancing agent is S1, the limit smoke enhancing tar equivalent of the first smoke enhancing agent is Tlimit1, the smoke enhancing agent content corresponding to the limit smoke enhancing tar equivalent of the first smoke enhancing agent is Mlimit1,
The tobacco shreds subjected to smoke enhancement include traditional tobacco shreds and a second smoke enhancing agent, the cigarette tar emission corresponding to the traditional tobacco shreds is Ttobacco·mg/cig, the mass percentage of the second smoke enhancing agent in the tobacco shreds subjected to smoke enhancement is Msmoke2, the smoke enhancing coefficient of the second smoke enhancing agent is S2, the limit smoke enhancing tar equivalent of the first smoke enhancing agent is Tlimit2, the smoke enhancing agent content corresponding to the limit smoke enhancing tar equivalent of the second smoke enhancing agent is Mlimit2,
The above parameters satisfy the following relationship within an error of ±5%:
T
target
=M
sheet×(Tsheet+Tlimit1−S1×(Mlimit1−Msmoke1)2)+Mtobacco×(Ttobacco+Tlimit2−S2×(Mlimit2−Msmoke2)2).
In order to further verify that the low-harm cigarette subjected to smoke enhancements do not increase harm while increasing the tar equivalent, 2 kinds of low-harm cigarette subjected to smoke enhancements with 10% and 20% butanetetraol content are manufactured according to the method of Embodiment 8, and measured together with traditional commercially available cigarettes Septwolves (Chundian), Jiaozi (X Rose), and Septwolves (Chuncui) for tar content/equivalent and harm H value.
It can be seen from Table 6 that the low-harm cigarette subjected to smoke enhancements still maintain relatively low harm while increasing the tar equivalent.
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are 3 mg of tobacco shreds blown out from Zhongnanhai cigarettes, and the sprayed smoke enhancing agent solutions are respectively a 50% butanetetraol aqueous solution, a 50% pentitol aqueous solution, and a 50% hexanehexol aqueous solution. The dosages of the smoke enhancing agent solutions are respectively adjusted to obtain 3 kinds of tobacco shreds subjected to smoke enhancement with 15% butanetetraol content, 15% pentitol content, and 15% hexanehexol content, relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement.
The above-mentioned tobacco shreds are manufactured into 4 samples, i.e. the traditional low-harm cigarette and low-harm cigarettes subjected to smoke enhancements with 15% butanetetraol content, 15% pentitol content, and 15% hexanehexol content according to the method of Embodiment 6, and their infrared shading rates are respectively measured by means of low-temperature (200° C.) heating puffing of a heating utensil on a smoking machine according to the Canadian deep puffing mode (puffing time is set to 3 seconds). The larger the value is, the higher the concentration of smoke is.
It can be seen from Table 7 that the traditional low-harm cigarettes that have not underwent smoke enhancing treatment can hardly release smoke during the heating process of the heating cigarette utensil, while the low-harm cigarette subjected to smoke enhancements can effectively release smoke, and the amount of smoke per puff is relatively uniform.
In addition to the above-mentioned butanetetraol, pentitol and hexanehexol, polyol materials of saccharides and sugar alcohols such as butantriol, pentanetriol, pentaerythritol, hexanetriol, hexanetetrol, hexanepentol, heptanetetrol, heptanepentol, heptanehexol, and volemitol all show smoke enhancing effects. In addition, the adjustment on the mass percentage of the smoke enhancing agent to be 5% to 25% relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement also shows a significant smoke enhancing effect.
In addition to the above-mentioned cigarettes including tobacco shreds, tobacco sheets that undergo smoke enhancing treatment with smoke enhancing agents such as butanetetraol, pentitol and hexanehexol also show higher infrared shading rates than tobacco sheets that do not undergo smoke enhancing treatment.
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are 3 mg of tobacco shreds blown out from Zhongnanhai cigarettes, and the sprayed smoke enhancing agent solutions are respectively a 50% butanetetraol aqueous solution, a 50% pentitol aqueous solution, and a 50% hexanehexol aqueous solution. The dosages of the smoke enhancing agent solutions are respectively adjusted to obtain 3 kinds of tobacco shreds subjected to smoke enhancement with 15% butanetetraol content, 15% pentitol content, and 15% hexanehexol content, relative to the mass of the finally dried tobacco shreds subjected to smoke enhancement. Propylene glycol and glycerol are sprayed to traditional tobacco shreds to prepare two groups of control tobacco shred samples with propylene glycol and glycerol content respectively accounting for 15% of the mass of the final tobacco shreds.
The tobacco shreds are sequentially wrapped into traditional low-harm cigarettes, low-harm cigarette subjected to smoke enhancements with 15% butanetetraol content, 15% pentitol content, and 15% hexanehexol content, and two groups of control samples with 15% propylene glycol content and 15% glycerol content according to the manufacturing method in Embodiment 6.
Their total particulate materials are respectively measured by means of heating puffing of heating utensils at different temperatures on smoking machines according to the Canadian deep puffing mode (puffing time is set to 3 seconds).
It can be seen from Table 8 that when low-harm cigarettes are treated with smoke enhancing agents such as butanetetraol, pentitol and hexanehexol, their total particulate material produced by heating with a heating cigarette utensil at 200° C. can be greater than or equal to 14.0 mg, which meets consumer's requirements for smoke.
In addition to the above-mentioned cigarettes including tobacco shreds, cigarettes including tobacco sheets that undergo smoke enhancing treatment with smoke enhancing agents such as butanetetraol, pentitol and hexanehexol, or blended cigarettes of tobacco shreds and tobacco sheets can also have a total particulate material of greater than or equal to 14.0 mg when heated by heating cigarette utensils at 200° C.
The cigarette samples in Embodiment 16 are further heated by heating utensils at different temperatures and puffed on smoking machines according to the Canadian deep puffing mode (puffing time is set to 3 seconds), and the emission of carbonyl compounds in smoke is measured (mg/cig).
It can be seen from Table 9 that when the low-harm cigarette subjected to smoke enhancement are heated at 200° C., harmful substances produced, such as aldehydes and ketones, are significantly lower than those when heated at 240° C.
In addition to the above-mentioned cigarettes including tobacco shreds, when cigarettes including tobacco sheets that undergo smoke enhancing treatment with smoke enhancing agents such as butanetetraol, pentitol and hexanehexol are heated at 200° C., harmful substances produced, such as aldehydes and ketones, are also significantly lower than those when heated at 240° C.
A tobacco sheet subjected to smoke enhancement is manufactured according to the method of Embodiment 1, the traditional tobacco sheet slurry used therein is a tobacco sheet slurry for manufacturing Baisha (Fine), and a proper amount of butanetetraol is blended as a smoke enhancing agent, to obtain a tobacco sheet subjected to smoke enhancement with butanetetraol content accounting for 15% of the mass of the finally dried tobacco sheet subjected to smoke enhancement.
The tobacco shreds subjected to smoke enhancement manufactured by the method in Embodiment 3 are used, the traditional tobacco shreds used therein are 3 mg of tobacco shreds blown out from Zhongnanhai cigarettes, and the sprayed smoke enhancing agent solution is a 50% butanetetraol aqueous solution. The dosage of the smoke enhancing agent solution is adjusted to obtain tobacco shreds subjected to smoke enhancement with butanetetraol content accounting for 15% of the mass of the finally dried tobacco shreds subjected to smoke enhancement.
The above-mentioned tobacco sheet and tobacco shreds are blended according to the proportions in Table 10 and made into cigarettes. Cigarette evaluators evaluate the senses by means of lighted puffing and heating puffing with heating utensils according to GB5606.4-2005 and sensory evaluation methods of Chinese cigarettes.
The terms and expressions based here are only used for description, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustration and description (or part of them), and it should be recognized that various modifications that may exist should also fall within the scope of the claims. Other modifications, changes and substitutions may also exist. Accordingly, the claims should be regarded as covering all these equivalents.
Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications of the above-mentioned embodiments are within the essential spirit scope of the present invention, they shall fall within the scope of the claims of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202010054169.0 | Jan 2020 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2020/132614 | 11/30/2020 | WO |
