Targeted fragrance guiding method and system for tobacco sheet

Abstract

The invention discloses a targeted fragrance guiding method and system for a tobacco sheet, the tobacco sheet is subjected to reversible perforation treatment to form reversible micropores in the tobacco sheet, the reversible perforation treatment is an electroporation process, and the electric field intensity of the electroporation process is 180-250V / cm; targeted fragrance guiding treatment is conducted on the tobacco sheet containing the reversible micropores, then curing treatment is conducted to promote the reversible micropores in the tobacco sheet to be closed, the fragrance-guiding tobacco sheet is obtained, the essence penetration depth of the fragrance-guiding tobacco sheet is larger than or equal to 0.8 mm, and the fragrance retention rate of the fragrance-guiding tobacco sheet stored for 6 months is larger than or equal to 90%. According to the invention, the aims of avoiding poor deep penetration, non-uniform essence penetration distribution and tobacco fragrance damage in the fragrance guide process are fulfilled.

Description

TECHNICAL FIELD

[0001] The patent belongs to the technical field of tobacco processing, and particularly relates to a targeted flavor guiding method and system for tobacco sheet. BACKGROUND

[0002] During the manufacturing process of the tobacco sheet, part of the original tobacco flavoring components will be volatilized or lost due to crushing, extraction, high-temperature drying and other production processes, resulting in weakened aroma and thin taste. Therefore, it is necessary to supplement these lost flavor substances through a flavor guiding process.

[0003] However, there are still several difficult problems in the current flavor guiding process of the tobacco sheet: First, the flavoring essence cannot penetrate into the deep layer of the tobacco sheet. No matter soaking, spraying or extrusion flavor guiding, the flavoring essence mostly stays on the surface of the tobacco sheet, and the deep layer penetration is poor. When burning, the surface flavoring essence is volatilized first, and the deep layer of the tobacco sheet has no flavor, resulting in inconsistent taste before and after. Second, the distribution is particularly uneven. Due to the different pore structures on the surface of the tobacco, the traditional coating method or the immersion method cannot control the direction of the flavoring essence, and part of the area will form a flavoring essence aggregation, and the flavoring essence in some areas will not penetrate into the inside of the tobacco sheet, which will cause the tobacco sheet to have thick and thin taste when smoking. Third, the tobacco components or structure are damaged. In order to make the flavoring essence penetrate, the existing technology usually needs to use an organic solvent to dissolve the surface layer cells of the tobacco, or high temperature and pressure, which is easy to damage the natural aroma of the tobacco.

[0004] Therefore, it is necessary to develop a new flavor guiding process for the tobacco sheet to avoid the problems of poor deep layer penetration, uneven distribution of flavoring essence penetration and damage to the aroma of the tobacco in the traditional coating method or immersion method. SUMMARY

[0005] The purpose of the patent is to provide a targeted flavor guiding method and system for tobacco sheet, which can avoid the problems of poor deep layer penetration, uneven distribution of flavoring essence penetration and damage to the aroma of the tobacco in the flavor guiding process.

[0006] To solve the above technical problems, the patent adopts the following technical solutions: A targeted flavor guiding method for tobacco sheet, comprising the following steps: Step B: reversibly perforating the tobacco sheet to form reversible micropores on the tobacco sheet, wherein the reversible perforation treatment is an electroporation process, and the electric field strength of the electroporation process is 180-250 V / cm; Step C: performing targeted flavor guiding treatment on the tobacco sheet containing reversible micropores, and then performing solidification treatment to close the reversible micropores on the tobacco sheet, to obtain a flavor guided tobacco sheet. The flavoring essence penetration depth of the flavor guided tobacco sheet is greater than or equal to 0.8 mm, and the aroma retention rate of the flavor guided tobacco sheet stored for 6 months is greater than or equal to 90%.

[0007] The present patent applies electroporation technology to tobacco, while traditional electroporation technology usually makes irreversible perforation under a large electric field intensity, which can cause the tobacco sheet to have a large decrease in tensile strength and be easy to crack and fall off; and the efficiency is too low and the parameters are ambiguous, so the time for guiding aroma is long in batch production. Since the perforation is irreversible micropore, the aroma retention rate and the aroma penetration depth effect are also poor. At the same time, the existing electroporation scheme lacks a precise parameter range, has poor industrial adaptability, and has large fluctuations in effect between different batches. The present application forms reversible micropores with precise parameter control, uniformly forms pores with a multi-electrode array, and then guides aroma through negative pressure-roller pressure, which can uniformly and efficiently guide aroma without damaging the components and structure of tobacco, thereby solving the above problems.

[0008] Further, the method further comprises step A, Step A: performing pre-perforation treatment on the tobacco sheet before reversible perforation treatment, wherein the pre-perforation treatment comprises pretreatment and electric field buffer treatment; The pretreatment comprises humidity adjustment, and the humidity adjustment controls the moisture content of the tobacco sheet to be 12-15%; The electric field buffer treatment is used to add a buffer solution to the tobacco sheet after the pretreatment.

[0009] Further, the buffer solution comprises a phosphate buffer solution, The ion concentration of the phosphate buffer solution is 0.1-0.3 mol / L; The electric field buffer treatment comprises the following steps: The pretreated tobacco sheet is soaked in the buffer solution for 5-10 seconds, and then the excess buffer solution on the surface of the tobacco sheet is drained.

[0010] Further, in step B, the pulse width of the electroporation process is 10-50 μs; The pulse frequency of the electroporation process is 1-5 Hz; The number of pulses of the electroporation process is 3-5 times; The distance between the electrode and the tobacco sheet in the electroporation process is 0.4-0.6 cm; The pore size of the reversible micropore is 50-200 nm.

[0011] Further, step C comprises the following steps: Step C1: performing targeted aroma guiding treatment on the tobacco sheet containing reversible micropores, controlling the temperature of the fragrance to be 30-40℃, so that the fragrance is close to the entrance of the reversible micropore in an environment with a negative pressure value of -0.03~-0.05 MPa, and a guiding roller is used to roll on the surface of the tobacco sheet to make the fragrance penetrate into the tobacco sheet along the reversible micropore channel, and the fragrance application amount per square meter of the tobacco sheet is 5-10 g; wherein the pressure of the guiding roller is 0.1-0.2 MPa; Step C2: solidification treatment is performed on the tobacco sheet after Step C1 to close the reversible micropores on the tobacco sheet.

[0012] Further, Step C2 comprises the following steps: Step C2-1: drying the tobacco sheet after Step C1 at 35-45°C for 10-15 minutes to perform a first low-temperature treatment to obtain a first solidified tobacco sheet; Step C2-2: solidifying the first solidified tobacco sheet at 50-60°C for 15-20 minutes to perform a second low-temperature treatment to obtain a tobacco sheet for targeted aroma guidance, wherein the moisture content of the tobacco sheet for targeted aroma guidance is 8-10%.

[0013] Further, the humidity in the first low-temperature treatment and the second low-temperature treatment is ≤40%.

[0014] The present patent further provides a system for targeted aroma guidance using any of the above tobacco sheets, comprising an electroporation module, a targeted aroma guidance module, and a low-temperature solidification module. The electroporation module is used to perform reversible perforation treatment on the tobacco sheet to form reversible micropores on the tobacco sheet. The targeted aroma guidance module is used to perform targeted aroma guidance treatment on the tobacco sheet containing reversible micropores. The low-temperature solidification module is used to perform solidification treatment to promote the closure of the reversible micropores on the tobacco sheet.

[0015] Further, the system further comprises a pretreatment module, a buffer supply module, a continuous conveying module, and a control system. The pretreatment module is used to pretreat the tobacco sheet. The buffer supply module is used to perform electric field buffer treatment on the tobacco sheet. The continuous conveying module is used to drive the tobacco sheet to sequentially pass through the pretreatment module, the buffer supply module, the electroporation module, the targeted aroma guidance module, and the low-temperature solidification module.

[0016] Further, the pretreatment module comprises a cleaning treatment device, a cutting treatment device, and a humidity adjusting device. The buffer supply module comprises a soaking pool and a draining machine. The electroporation module comprises a high-voltage pulse generator, a multi-electrode array, an insulation protective cover, and a buffer recovery tank. The high-voltage pulse generator is used to output a voltage of 0-20kV and a frequency of 0-10Hz to control the electric field intensity. The multi-electrode array comprises an upper multi-electrode array and a lower multi-electrode array, The upper multi-electrode array and the lower multi-electrode array are arranged in an upper-lower symmetric arrangement. The upper group of multi-electrode array and the lower group of multi-electrode array are both provided with 10-15 electrodes, and the spacing between the electrodes is 2 cm, The material of the electrodes is titanium alloy material; The insulation protective cover is arranged outside the multi-electrode array and the high-voltage pulse generator; The buffer recovery tank is used to receive the residual buffer liquid arranged at the bottom of the tobacco sheet; The target fragrance guiding module comprises a fragrance storage tank, a negative pressure generator, a fragrance guiding roller and a flow sensor; The fragrance storage tank is connected to the negative pressure cavity through the flow pump, and the fragrance storage tank controls the application amount of the fragrance by the flow pump, so that the fragrance is close to the reversible micropore inlet of the tobacco sheet in the negative pressure cavity; The fragrance guiding roller is made of silica gel material; The low-temperature curing module comprises a hot air circulation oven, a humidity sensor and a micropore closure monitoring assembly; The continuous conveying module comprises a conveying belt; The control system comprises a PLC controller.

[0017] The patent is based on the process of "tobacco sheet pretreatment-precise parameter reversible micropore making-electrode array uniform perforation-negative pressure and roller pressure synergistic efficient fragrance guiding-low temperature curing", matched with a special integrated device, which can continuously produce in batches, realizes the reversible micropore making by physical method, does not use chemical solvent and high temperature, completely retains the natural ingredients of the tobacco sheet, and maintains the mechanical properties (tensile strength decrease <5%); secondly, the fragrance is accurately penetrated to the deep layer (≥0.8 mm), uniformly distributed, and the taste consistency is improved; at the same time, the core process parameter range is clear, the multi-electrode array and the continuous conveying system are designed, the industrialized batch fragrance guiding is realized, and the processing time is shortened; in addition, by making reversible micropore features, an efficient, safe, accurate and easy industrialization fragrance guiding solution is provided.

[0018] The patent provides a targeted fragrance guiding method and system for tobacco sheet, which has the following benefits compared with the prior art: 1. Accurate and uniform fragrance guiding: the fragrance penetration depth is ≥0.8 mm, the surface and deep layer content difference is less than 10%, the fragrance is consistent before and after burning, the problem of "heady fragrance and light tail fragrance" is completely solved, and the uniformity of product fragrance release is ≥95%; 2. More persistent fragrance retention: low-temperature curing makes the fragrance and the sheet fiber combine firmly, the reversible micropore is closed to lock the fragrance, and the fragrance retention rate is still ≥85% after 6 months of normal temperature storage, which is about 30% more than the traditional soaking method; 3. Double protection of tobacco components and structure: without high temperature and additional solvent, only food-grade buffer liquid is used, the natural fragrance and active substances of tobacco are not lost, the taste is more pure; the reversible micropore design makes the tensile strength of the tobacco sheet decrease <5%, the mechanical properties are stable, and the tobacco sheet is not easy to fall off and crack; 4. Strong industrialization adaptability: multi-electrode array and continuous transmission system, capable of processing a large amount of tobacco sheet per hour, reducing the flavoring time from several hours to tens of minutes, accurately controlling the parameters, and achieving a qualified rate of ≥98% for different batches of products, and greatly improving the production capacity. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above content of the patent and the following detailed description will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions.

[0020] Figure 1 A flowchart of the tobacco sheet targeted flavoring method in the patent; Figure 2 A structural diagram of the tobacco sheet targeted flavoring system in the patent; Figure 3 A structural diagram of the targeted flavoring module in the patent; Figure 4 A SEM scanning diagram of the tobacco sheet before reversible perforation processing in the patent; Figure 5 A SEM scanning diagram of the tobacco sheet after reversible perforation processing in the patent; Figure 6 A diagram of reversible micropores of the tobacco sheet in the patent; Figure 7 A diagram of irreversible micropores of the tobacco sheet in Comparative Example 1.

[0021] Among them, the reference signs are explained as follows: Pretreatment module: 10 Buffer supply module: 20 Electroporation module: 30 Reversible micropore: 31 Targeted flavoring module: 40 Flavor storage tank: 41 Negative pressure generator: 42 Flavoring roller: 43 Flow sensor: 44 Low-temperature curing module: 50 Continuous conveying module: 60 Control system: 70 DETAILED DESCRIPTION

[0022] The detailed features and advantages of the patent are described in detail in the detailed description below, which are sufficient for any person skilled in the art to understand the technical content of the patent and to implement it, and according to the description, claims and drawings disclosed in the specification, those skilled in the art can easily understand the purposes and advantages related to the patent.

[0023] The present specification also utilizes several compound terms to describe an apparatus, element, device, etc. comprising more than one function, or to attribute additional functions to a certain corresponding apparatus, element, device, etc., and the skilled person understands that such compound terms can be realized in a single or in multiple apparatuses, elements, devices, etc. as long as it is reasonable under the rules of interpretation of the patent terms.

[0024] It should be noted that in the present specification, like reference numerals and letters designate similar items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in the subsequent drawings. In the present specification and claims, several terms will be mentioned, and unless otherwise indicated, these terms will be defined to have the following meanings: The term "comprising" or "having" has the same meaning as containing, and also includes other forms such as the English gerund and singular forms, means including but not limited to, and is not intended to exclude, for example, other elements, components, integers or steps; All other terms used herein are intended to have the general meaning understood by the person of ordinary skill in the art to which the present patent pertains, and in particular, the meaning that the person of ordinary skill in the art can directly and unambiguously determine how to realize the meaning of the technical solution of the present patent after reading the claims, the specification and the drawings of the present patent.

[0025] Even if the grammar, words, punctuation, graphics, symbols, etc. in the claims, the specification and the drawings of the present patent have not been described in detail, are missing or ambiguous, the person of ordinary skill in the art can still obtain the only correct understanding without much reasoning or testing by reading the claims, the specification and the drawings as a whole, and effectively exclude all kinds of incorrect understanding methods that are not targeted to achieve the purpose of the present patent.

[0026] The person of ordinary skill in the art will first choose to read the claims, the specification and the drawings of the present patent to reasonably explain the terms; secondly, choose to refer to the relevant definitions in other documents disclosed by the applicant before the filing date to reasonably explain the terms; thirdly, choose to reasonably explain the terms by referring to the cited references in the present patent; and finally, choose to reasonably explain the terms by combining the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc. commonly used by the person of ordinary skill in the art.

[0027] The entire contents of all references cited in this application are hereby incorporated by reference to the extent that they provide exemplary procedural or other details which can be applied to the practice of the application, without contradiction. It will be apparent to those skilled in the art that products (devices, elements, equipment, compounds, compositions, materials, etc.) and methods (processes, steps, conditions, parameters, apparatuses, and test methods, etc.) other than those specifically described in the specification can be employed in the practice of the application without resort to undue experimentation, and that the best mode for carrying out the application has been described. The patent is not to be limited to the details shown, since the spirit and scope of this patent are encompassed by the claims. Marks' Standard Handbook for Mechanical Engineers (11th edition and other editions prior to the date of the present patent application) published by McGraw-Hill, Inc.; DeGarmo's Materials and Processes in Manufacturing (13th edition and other editions prior to the date of the present patent application) edited by DeGarmo et al. and published by Wiley; Machinery's Handbook (32nd edition and other editions prior to the date of the present patent application) edited by Oberg et al. and published by Industrial Press Inc.; Mechanical Design Handbook (6th edition and other editions prior to the date of the present patent application) edited by Cheng Daxian and published by Chemical Industry Press; and Modern Machinery Design Handbook (6th edition and other editions prior to the date of the present patent application) edited by Wen Bangtun and published by Machinery Industry Press.

[0028] The present patent will now be described with reference to the drawings, wherein like reference numerals refer to like elements throughout. While specific structures and arrangements are discussed, it should be understood that these are used by way of example only. Those skilled in the art will recognize that other structures and arrangements can be employed without departing from the spirit and scope of the present patent. It will be apparent to those skilled in the art that the present patent can also be employed in various other applications.

[0029] The present patent provides a method for targeted flavoring of tobacco sheet, comprising the following steps: Step A: Pre-perforation treatment is performed on the tobacco sheet before reversible perforation treatment, the pre-perforation treatment comprising pretreatment and electric field buffer treatment; The pretreatment comprises humidity adjustment, the humidity adjustment controlling the moisture content of the tobacco sheet to be 12-15%; The electric field buffer treatment is used to add buffer to the tobacco sheet after the pretreatment; The buffer solution includes a phosphate buffer solution, The ion concentration of the phosphate buffer solution is 0.1-0.3 mol / L; The electric field buffer solution treatment includes the following steps: The pretreated tobacco sheet is soaked in the buffer solution for 5-10 seconds, and then the excess buffer solution on the surface of the tobacco sheet is drained; Step B: The tobacco sheet is subjected to reversible perforation treatment to form reversible micropores on the tobacco sheet, wherein the reversible perforation treatment is an electroporation process, and the electric field strength of the electroporation process is 180-250 V / cm; The pulse width of the electroporation process is 10-50 μs; The pulse frequency of the electroporation process is 1-5 Hz; The number of pulses of the electroporation process is 3-5 times; The distance between the electrode and the tobacco sheet in the electroporation process is 0.4-0.6 cm; The pore size of the reversible micropores is 50-200 nm; Step C: The tobacco sheet containing reversible micropores is subjected to targeted flavor guiding treatment, the temperature of the flavoring essence is controlled at 30-40℃, the flavoring essence is close to the entrance of the reversible micropores in an environment with a negative pressure value of -0.03~-0.05 MPa, a guiding roller is used to roll on the surface of the tobacco sheet to make the flavoring essence penetrate into the tobacco sheet along the reversible micropore channel, and the application amount of the flavoring essence per square meter of the tobacco sheet is 5-10 g; wherein the pressure of the guiding roller is 0.1-0.2 MPa; the tobacco sheet is dried at 35-45℃ for 10-15 minutes to perform a first low-temperature treatment, a first solidified tobacco sheet is obtained; the first solidified tobacco sheet is solidified at 50-60℃ for 15-20 minutes to perform a second low-temperature treatment, the humidity of the environment is maintained at ≤40% during the first low-temperature treatment and the second low-temperature treatment, a flavor-guided tobacco sheet is obtained, the moisture content of the flavor-guided tobacco sheet is 8-10%, the penetration depth of the flavoring essence of the flavor-guided tobacco sheet is ≥0.8 mm, and the aroma retention rate of the flavor-guided tobacco sheet stored for 6 months is ≥90%.

[0030] Example 1

[0031] As Figures 1-3As shown, the patent provides a system for the targeted fragrance guiding method of the above tobacco sheet, the fragrance guiding system is composed of a pretreatment module 10, a buffer solution supply module 20, an electroporation module 30 (containing a multi-electrode array), a targeted fragrance guiding module 40, a low-temperature solidification module 50, a continuous conveying module 60 and a control system 70. The continuous conveying module 60 drives the tobacco sheet to pass through the pretreatment module 10, the buffer solution supply module 20, the electroporation module 30, the targeted fragrance guiding module 40 and the low-temperature solidification module 50 in turn, and finally enters the next production process under the control of the control system 70 to be packed to prepare a cigarette product, and the control system 70 can be linked to each unit to realize automatic continuous processing.

[0032] Pre-treatment module

[0033] The pretreatment module 10 is used for cleaning treatment, cutting treatment and humidity adjustment of the tobacco sheet to be guided.

[0034] The cleaning treatment device includes a blowing structure for cleaning the dust and impurities on the surface of the tobacco sheet. Among them, the blowing structure can apply the traditional structure on the market, which will not be described here.

[0035] The cutting treatment device includes a tobacco shearing blade for cutting the tobacco sheet into a size suitable for the device. In this embodiment, the tobacco sheet can be cut into 10 cm wide and 10 cm long. Among them, the tobacco shearing blade can apply the traditional structure on the market, which will not be described here.

[0036] The humidity adjustment device includes a nozzle and / or a low-temperature dryer for water mist humidification or low-temperature drying of the tobacco sheet, so that the moisture content of the tobacco sheet is controlled at 12-15%. It has been found through research that the moisture content of the tobacco sheet greatly affects the effect of forming reversible micropores 31; when the moisture content of the tobacco sheet is less than 12%, the tobacco sheet is easily broken down by high voltage in the electroporation module 30; and when the moisture content of the tobacco sheet is higher than 15%, the tobacco sheet is too wet, which affects the ion concentration stability of the buffer solution in the buffer solution supply module 20 and the effect of forming reversible micropores 31 in the electroporation module 30. This humidity just ensures the pore forming effect. Among them, the nozzle and the low-temperature dryer can apply the traditional structure on the market, which will not be described here.

[0037] Buffer supply module

[0038] The buffer solution supply module 20 is used for receiving the tobacco sheet from the pretreatment module 10 and performing electric field buffer solution treatment.

[0039] The buffer solution supply module 20 includes a filling by buffer solution soaking pool and a draining machine.

[0040] Phosphate buffer can be used as the buffer solution. The ion concentration of the phosphate buffer should be adjusted to 0.1-0.3 mol / L, and in this embodiment, 0.2 mol / L is preferred. The buffer solution can stabilize the electric field environment, prevent the formation of irreversible micropores 31 due to excessive local electric field, and protect the components in the tobacco sheet from oxidation.

[0041] The electric field buffering process steps are as follows: The pretreated tobacco sheets are rapidly immersed in buffer solution in an immersion tank for 5-10 seconds, resulting in a moisture content of 25%-30%. Then, a drainer is used to drain excess buffer solution from the surface of the tobacco sheets. At this point, the surface of the tobacco sheets resembles... Figure 4 As shown.

[0042] Electroporation module

[0043] The electroporation module 30 is used to receive tobacco sheets that have undergone electric field buffer treatment and to perform reversible perforation treatment on them.

[0044] The electroporation module 30 includes a high-voltage pulse generator, a multi-electrode array, an insulating protective cover, and a buffer recovery tank.

[0045] The high-voltage pulse generator is used to control the output voltage to 0-20kV and the output frequency to 0-10Hz, accurately outputting pulse signals with adjustable parameters, and linking with the continuous conveying system to make the electric field strength precisely controllable.

[0046] The electrode angles of the multi-electrode array are finely adjustable, allowing the tobacco sheet to be placed within the array. Preferably, the multi-electrode array includes an upper multi-electrode array and a lower multi-electrode array, arranged symmetrically vertically. Both the upper and lower multi-electrode arrays have 10-15 electrodes spaced 2 cm apart. The electrodes are made of corrosion-resistant titanium alloy and have an insulating coating on their surfaces, conducting electricity only during pulses.

[0047] An insulating protective cover is installed outside the multi-electrode array and the high-voltage pulse generator to prevent high-voltage leakage.

[0048] A buffer recovery tank is placed at the bottom of the tobacco sheet to receive residual buffer solution, avoiding waste and contamination; The parameters for the reversible perforation process performed by the electroporation module 30 are as follows: Electric field strength: 180-250V / cm (corresponding to voltage 5-15kV, matching 0.1-0.3mm thick sheet). If it is below 180V / cm, the holes in the tobacco sheet will not be formed enough. If it is above 250V / cm, irreversible holes will easily be formed. In this embodiment, 210V / cm is preferred. Pulse width: 10-50 μs, preferably 20 μs in this embodiment; Pulse frequency: 1-5 Hz, 1-5 Hz frequency can balance the uniformity of the hole and processing efficiency, the preferred embodiment is 3 Hz; Pulse number: 3-5 times, the preferred embodiment is 4 times; The distance between the electrode and the tobacco sheet is 0.5 cm, which can ensure the formation of reversible micropores 31 on the tobacco sheet.

[0049] Under the action of high-voltage pulse, as shown in Figures 5-6 The tobacco sheet forms uniformly distributed reversible nano-micropores (pore size 50-200 nm) inside, the micropore channels penetrate through the tobacco sheet up and down (penetration depth ≥0.8 mm), without damaging the surface flatness, and the subsequent solidification can be naturally closed, and the tensile strength of the sheet is controlled within 5%.

[0050] Targeted fragrance module

[0051] The targeting fragrance guiding module 40 is used for targeted fragrance guiding processing of the tobacco sheet after reversible perforation processing.

[0052] The targeting fragrance guiding module 40 includes a fragrance storage tank 41, a negative pressure generator 42, a + fragrance guiding roller 43 and a flow sensor 44.

[0053] The fragrance storage tank 41 has a heating and temperature maintaining function for the fragrance, with a temperature accuracy of ±2℃, so that the fragrance is in a liquid or paste state, and the temperature is controlled in the range of 30-40℃ to improve the flowability without damaging the ingredients. The preferred temperature in the present embodiment is controlled at 35℃; The negative pressure generator 42 is connected to the negative pressure cavity, and the negative pressure value in the negative pressure cavity is -0.03~-0.05MPa, and the preferred negative pressure value in the negative pressure cavity in the present embodiment is -0.04MPa; The fragrance guiding roller 43 is made of silica gel material to avoid scratching the tobacco sheet, and the pressure of the fragrance guiding roller 43 is 0.1-0.2MPa to prevent damage to the reversible micropores 31, and the preferred pressure in the present embodiment is 0.2MPa; The flow sensor 44 is used to monitor the fragrance consumption of the flow pump with an accuracy of ±0.1g.

[0054] The fragrance guiding processing process steps are as follows: The tobacco sheet after reversible perforation processing by the electroporation module 30 is first passed through the negative pressure cavity in the targeting fragrance guiding module 40, the fragrance storage tank 41 is connected to the negative pressure cavity through the flow pump, and the fragrance in the fragrance storage tank 41 is close to the entrance of the reversible micropores 31 of the tobacco sheet under the control of the flow pump based on the negative pressure effect of the negative pressure cavity; then the fragrance guiding roller 43 is used to roll on the surface of the tobacco sheet to promote the penetration of the fragrance along the reversible micropore 31 channel to the deep layer; The essence application amount in the essence storage tank is controlled by the flow pump, the essence use amount per square meter of the sheet is 5-10 g, the essence use amount per square meter of the sheet is preferably 8 g in the embodiment, the uniform penetration is ensured, and the final essence retention rate is greater than or equal to 90%.

[0055] Low temperature solidification module

[0056] The low-temperature curing module 50 is used for curing treatment of the tobacco sheet subjected to the targeted guide essence treatment, and promoting the natural closure of the reversible micropores 31.

[0057] The low-temperature curing module 50 comprises a hot air circulation oven, a humidity sensor and a micropore closure monitoring assembly.

[0058] The temperature precision of the hot air circulation oven is ±2 ℃; The humidity sensor is used for controlling the humidity in the hot air circulation oven to be less than or equal to 40%; The micropore closure monitoring assembly is used for detecting the structure of the reversible micropores 31 of the tobacco sheet and uploading the result to the control system 70; the micropore closure monitoring assembly can be selected as a microscope or the like.

[0059] The curing treatment process steps are as follows: Two-stage low-temperature treatment is adopted, the temperature of the hot air circulation oven in the first-stage low-temperature treatment is set to 35-45 ℃ for drying for 10-15 minutes, the temperature is preferably 40 ℃ for drying for 12 minutes in the embodiment, the excess water and the buffer residue are removed, and the first cured tobacco sheet is obtained; The temperature of the hot air circulation oven in the second-stage low-temperature treatment is set to 50-60 ℃ for curing for 15-20 minutes, the temperature is preferably 55 ℃ for drying for 18 minutes in the embodiment, the essence is firmly combined with the sheet fibers, and the reversible micropores 31 are promoted to be naturally closed, and the guide essence tobacco sheet is obtained.

[0060] The curing effect is that the moisture content of the tobacco sheet finished product returns to 8-10%, the essence cannot be easily volatilized or dropped, and the fragrance is uniformly released during combustion.

[0061] Continuous delivery module

[0062] The continuous conveying module 60 is used for conveying the tobacco sheet between the pretreatment module 10, the buffer supply module 20, the electroporation module 30, the targeted guide essence module 40 and the low-temperature curing module 50.

[0063] The continuous conveying module 60 can be selected as a high-temperature-resistant conveying belt (polytetrafluoroethylene material), the control system 70 controls the conveying speed of the tobacco sheet to be 0.5-1 m / min, and is linked with the parameters (frequency and pulse times) of the electroporation module 30 and the parameters (negative pressure value and essence flow) of the targeted guide essence module 40, to ensure the consistency of the treatment of each tobacco sheet.

[0064] Control system

[0065] The control system 70 comprises a PLC controller, which monitors parameters such as electric field intensity, pulse frequency, buffer ion concentration, negative pressure value, and conveying speed in real time, and automatically adjusts once the parameters deviate from the set range; and can also preset multiple sets of process parameters according to different tobacco sheet thicknesses and essence types, and conveniently switch.

[0066] Comparative Example 1

[0067] First, the tobacco sheet base is cut to an appropriate size and laid between the electrode plates of the electroporation treatment device, to ensure that the base fully adheres to the electrodes and is uniformly stressed; then, a pulse electric field with an electric field intensity of 20 kV / cm, a pulse width of 35 μs, and a pulse frequency of 70 Hz is applied to the tobacco sheet base for 20 minutes, during which the temperature of the treatment environment is maintained at 25-30°C and the relative humidity is maintained at 55-65%, to avoid interference from the electric field; after the electroporation treatment is completed, the tobacco sheet base is sent to a drying device, and the drying temperature is controlled at 70°C and the air speed is controlled at 1 m / s, and the drying is continued until the moisture content of the sheet is stabilized at 8-12%, The essence is sprayed onto the tobacco sheet, and after drying, a tobacco sheet containing irreversible microporous structures is obtained, which can be referred to Figure 7 .

[0068] The tobacco sheet guiding essence prepared in Example 1 and Comparative Example 1 is taken as 12 groups of samples for parallel repeated detection of the depth of essence penetration, and the retention rate of aroma is detected after storage for 6 months in an environment with a temperature of 25°C and a humidity of 60%±2%, and the results are shown in Table 1.

[0069] Table 1: Results of performance detection of tobacco sheet

[0070] As can be seen from Table 1, the depth of essence penetration in the tobacco sheet of the present patent is ≥0.8 mm, the difference between the surface and deep essence content is ≤10%, the retention rate of aroma is ≥90% (stored for 6 months at room temperature), and the overall guiding essence effect is better than that of Comparative Example 1.

[0071] In the present patent, the buffer ion concentration is controlled at 0.1-0.3 mol / L, the electric field intensity is controlled at 180-250 V / cm, the pulse frequency is controlled at 1-5 Hz, and the reversible micropore diameter is controlled at 50-200 nm, so that the tensile strength of the tobacco sheet is reduced by <5%; The final moisture content of the tobacco sheet prepared in Example 1 is 8-10%, the uniformity of aroma release during combustion is ≥95%, there is no solvent or buffer residue, and the mechanical properties meet the requirements of cigarette processing.

[0072] The terms and expressions employed herein have been used as terms of description and not of limitation, and there is no intention that in the use of such terms and expressions of excluding any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the patent claimed. Thus, it should be understood that although the present patent has been specifically disclosed by preferred embodiments, exemplary embodiments and optional features, modification and variation of the specific implementation could be resorted to by those skilled in the art without departing from the scope of the patent. It is therefore intended that such modifications and variations are considered as within the scope of the patent.

[0073] The preceding description of the specific embodiments will so fully reveal the general nature of the patent that others can, by applying knowledge of those art, adapt it for various applications or modify it to

[0074] Furthermore, the scope of the patent is not intended to be limited to the specific embodiments disclosed herein, but only by the claims below.

Claims

1. A targeted aroma delivery method for tobacco sheets, characterized in that, Includes the following steps: Step B: The tobacco sheet is subjected to reversible perforation treatment to form reversible micropores on the tobacco sheet, wherein the reversible perforation treatment is an electroporation process, and the electric field strength of the electroporation process is 180-250V / cm. Step C: The tobacco sheet containing the reversible micropores is subjected to targeted aroma delivery treatment, and then cured to cause the reversible micropores on the tobacco sheet to close, thereby obtaining an aroma-delivered tobacco sheet. The aroma-delivered tobacco sheet has an aroma penetration depth ≥0.8mm and an aroma retention rate ≥90% after 6 months of storage.

2. The targeted aroma delivery method for tobacco sheets according to claim 1, characterized in that, The method further includes step A. Step A: The tobacco sheet is subjected to a pre-perforation treatment before the reversible perforation process, which includes pretreatment and electric field buffer treatment. The pretreatment includes humidity control, wherein the moisture content of the tobacco sheet is controlled to be 12-15%. The electric field buffer treatment is used to add buffer to the tobacco sheets that have undergone the pretreatment.

3. The targeted aroma delivery method for tobacco sheets according to claim 2, characterized in that, The buffer solution includes a phosphate buffer. The ion concentration of the phosphate buffer solution is 0.1-0.3 mol / L; The electric field buffer treatment includes the following steps: Immerse the pretreated tobacco sheet in buffer solution for 5-10 seconds, and then drain off any excess buffer solution from the surface of the tobacco sheet.

4. The targeted aroma delivery method for tobacco sheets according to claim 1, characterized in that, In step B, the pulse width of the electroporation process is 10-50 μs; The pulse frequency of the electroporation process is 1-5 Hz; The number of pulses in the electroporation process is 3-5. The distance between the electrode and the tobacco sheet in the electroporation process is 0.4-0.6 cm; The reversible micropores have a pore size of 50-200 nm.

5. The targeted aroma delivery method for tobacco sheets according to claim 1, characterized in that, Step C includes the following steps: Step C1: The tobacco sheet containing the reversible micropores is subjected to targeted aroma delivery treatment. The temperature of the aroma is controlled at 30-40℃, so that the aroma is close to the entrance of the reversible micropores under a negative pressure of -0.03~-0.05MPa. An aroma delivery roller is used to roll the surface of the tobacco sheet, so that the aroma penetrates into the interior of the tobacco sheet along the reversible micropore channels. The amount of aroma applied per square meter of the tobacco sheet is 5-10g; wherein the pressure of the aroma delivery roller is 0.1-0.2MPa. Step C2: The tobacco sheet that has undergone step C1 is cured to close the reversible micropores on the tobacco sheet.

6. The targeted aroma delivery method for tobacco sheets according to claim 5, characterized in that, Step C2 includes the following steps: Step C2-1: The tobacco sheet obtained in step C1 is dried at 35-45°C for 10-15 minutes to perform the first low-temperature treatment, thereby obtaining the first cured tobacco sheet; Step C2-2: The first cured tobacco sheet is cured at 50-60℃ for 15-20 minutes to carry out the second low-temperature treatment, thereby obtaining the aroma-conducting tobacco sheet, wherein the moisture content of the aroma-conducting tobacco sheet is 8-10%.

7. The targeted aroma delivery method for tobacco sheets according to claim 6, characterized in that, The ambient humidity during the first and second stages of low-temperature treatment is ≤40%.

8. A system for applying the targeted aroma delivery method of tobacco sheet according to any one of claims 1-7, characterized in that, Includes an electroporation module, a targeted fragrance delivery module, and a low-temperature curing module; The electroporation module is used to perform the reversible perforation process on the tobacco sheet to form reversible micropores on the tobacco sheet; The targeted aroma delivery module is used to perform the targeted aroma delivery treatment on tobacco sheets containing the reversible micropores; The low-temperature curing module is used to perform the curing process to cause the reversible micropores on the tobacco sheet to close.

9. The system according to claim 8, characterized in that, The system also includes a pretreatment module, a buffer supply module, a continuous delivery module, and a control system; The preprocessing module is used to perform the preprocessing on the tobacco sheet; The buffer supply module is used to treat the tobacco sheet with the electric field buffer solution; The continuous conveying module is used to drive the tobacco sheet through the pretreatment module, the buffer supply module, the electroporation module, the targeted aroma delivery module, and the low-temperature curing module in sequence.

10. The system according to claim 9, characterized in that, The pretreatment module includes a cleaning device, a cutting device, and a humidity control device; The buffer supply module includes an immersion tank and a drainer; The electroporation module includes a high-voltage pulse generator, a multi-electrode array, an insulating protective cover, and a buffer recovery tank; The high-voltage pulse generator is used to output a voltage of 0-20kV and a frequency of 0-10Hz to control the electric field strength. The multi-electrode array includes an upper multi-electrode array and a lower multi-electrode array. The upper multi-electrode array and the lower multi-electrode array are arranged symmetrically vertically. Both the upper multi-electrode array and the lower multi-electrode array have 10-15 electrodes, and the spacing between the electrodes is 2cm. The electrode is made of titanium alloy. The insulating protective cover is disposed outside the multi-electrode array and the high-voltage pulse generator; The buffer recovery tank is located at the bottom of the tobacco sheet to receive residual buffer solution; The targeted fragrance delivery module includes a fragrance storage tank, a negative pressure generator, a fragrance delivery roller, and a flow sensor; The flavor storage tank is connected to the negative pressure chamber via a flow pump. The amount of flavor applied to the flavor storage tank is controlled by the flow pump, so that the flavor is close to the reversible micropore inlet of the tobacco sheet in the negative pressure chamber. The fragrance guide roller is made of silicone. The low-temperature curing module includes a hot air circulating oven, a humidity sensor, and a micropore closure monitoring component; The continuous conveying module includes a conveyor belt; The control system includes a PLC controller.

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