Perfuming production control method for cigarettes

Abstract

The invention discloses a perfuming production control method for cigarettes, which belongs to the technical field of tobacco production control, and comprises the following steps: pouring perfume into a perfume temporary storage tank according to product requirements; according to production requirements, the selection switch is rotated to set positions, and the set positions comprise an automatic mode, a manual mode and a cleaning mode; setting a plurality of key parameters on the control panel; spice feeding control is carried out based on the multiple key parameters; performing spice pre-filling; based on the received linkage signal, a plurality of valves are controlled to be opened, and perfume is applied to the surface of the slice; and when a shutdown signal of the cigarette making machine is received, the perfuming system automatically stops perfuming. The perfuming device can more accurately control perfume feeding, avoids perfuming amount deviation caused by pipe emptying or partial filling, and realizes high-precision perfuming.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco production control, and more specifically, to a method for controlling the flavoring production of cigarettes. Background Art

[0002] In the production of heated cigarettes, the rolling and joining processes are mainly presented in the following two types: one is the disordered heating cigarette processing process. In this process, various types of smoking materials, such as common tobacco shreds, thin shreds, or other materials with smoking characteristics, must first be processed into filamentary forms. Subsequently, traditional flavoring equipment is used to perform the flavoring process, and the materials are stored and processed after the flavoring is completed. In the rolling and joining process, modified traditional cigarette machines are used to complete the corresponding operations, so as to produce heated cigarette products with different styles and rich flavors. The second is the orderly heating cigarette processing process. This process has a unique process step. First, the smoking material is carefully rewound into a reel style to facilitate subsequent continuous production operations. Entering the formal production stage, the reel of smoking material goes through the unwinding process in sequence, opening the winding state; the flattening operation, so that the material is spread out flat for subsequent fine processing; the pressing and cutting process, cutting the material according to the established specifications; then entering the flavoring process, accurately applying spices to give the product a unique flavor; followed by the gathering step, gathering the loose materials into shape; then wrapping with cigarette paper to initially build the shape of the cigarette; then cutting the continuous cigarette strips into single shapes through cigarette slitting; finally, through the overlapping process, the structural integrity of the cigarette is improved, so as to successfully manufacture heated cigarette products that meet different consumer needs. Compared with the disorderly heated cigarette processing technology, the orderly heated cigarette processing technology and the traditional cigarette processing technology have significant differences in many aspects such as process architecture, equipment selection and process parameters, which also means that its technical difficulty is relatively high and requires more sophisticated production control and technical support.

[0003] In the modern cigarette production process, accurate and timely tracking of the flavoring process is essential to ensure the consistency and stability of product quality. However, existing technical means often find it difficult to quickly locate the key nodes in the flavoring process, from the beginning of flavoring to its precise injection into cigarette materials. The system spends too much time on monitoring and feedback.

[0004] Due to the interference of many factors, the flavoring system often experiences large fluctuations during operation. On the one hand, there are deficiencies in the mechanical hardware level. For example, the delivery accuracy of the flavoring pump is limited, and its internal mechanical structure wears out and ages after long-term operation, resulting in unstable volume of flavors output each time; on the other hand, the control system cannot accurately adjust the flavoring parameters in real time according to dynamic changes such as production line speed and material flow. Fluctuations may cause significant differences in the amount of flavoring in the same batch of cigarettes in a short period of time, damaging product quality.

[0005] The existing flavoring production control methods are difficult to meet the high-precision requirements. The mean deviation of the flavor content of different batches of cigarette products is large, and it is impossible to maintain a stable flavor characteristic, which makes the aroma released when the cigarette burns unbalanced, affecting the direct consumption experience of the cigarette. Summary of the invention

[0006] An object of the present invention is to provide a method for controlling the flavoring production of cigarettes, so as to solve the problems of the aforementioned flavoring system in operation, such as large fluctuations, long tracking time, and low flavoring accuracy.

[0007] According to the present invention, there is provided a method for controlling the production of flavoring cigarettes, comprising the following steps:

[0008] Pour the spices into the spice storage tank according to product requirements;

[0009] According to production needs, rotate the selection switch to the set position, which includes three positions: automatic mode, manual mode, and cleaning mode;

[0010] Set multiple key parameters on the control panel;

[0011] Spice feeding control based on multiple key parameters;

[0012] Carry out spice pre-filling;

[0013] Based on the received linkage signal, multiple valves are controlled to open to apply the fragrance to the surface of the sheet;

[0014] When receiving the cigarette machine stop signal, the flavoring system automatically stops flavoring.

[0015] Optionally, the three positions of the selection switch correspond to three modes, specifically including:

[0016] Automatic mode: The system detects the running speed of the slices in real time, calculates the theoretical aromatherapy flow rate, and aromatizes the running slices based on the theoretical aromatherapy flow rate. At the same time, the timely aromatherapy flow rate is compared with the theoretical aromatherapy flow rate for compensation;

[0017] Manual mode: The running slices are scented according to the scenting flow setting parameters, and the slice running speed defaults to the manual virtual vehicle speed setting;

[0018] Cleaning mode: Set the servo pump speed to a fixed value and select the cleaning item on the control panel.

[0019] Optionally, after pouring the spices into the spice temporary storage tank according to product requirements, it also includes:

[0020] Start the power supply, the power light will turn on, and the system will automatically detect whether all parts of the fragrance adding system are normal.

[0021] Optionally, multiple key parameter settings can be made on the control panel, including:

[0022] Set the weight of the high and low levels of the spice tank, the amount of fragrance added, and the compressed air pressure on the control panel;

[0023] Select the fragrance curve and fragrance method;

[0024] Turn on the automatic stirring function to mix the fragrance liquid evenly;

[0025] Set the heating temperature and start the heating program to heat the spices to the set temperature.

[0026] Optionally, the fragrance amount is set on the control panel, specifically including:

[0027] G= ;

[0028] Where G is the amount of fragrance added, in g / m; m is the weight of the flakes, in g / m 2 , obtained through physical inspection or process requirements; c is the width of the sheet, obtained through physical inspection or process requirements; the unit is m; a is the fragrance ratio, the unit is %;

[0029] During production, the aroma flow rate is automatically calculated based on the detected vehicle speed. The formula is as follows:

[0030] L= ;

[0031] In the formula: L is the timely fragrance flow rate, unit is g / min, G is the fragrance amount, unit is g / m; v is the timely vehicle speed, unit is m / min.

[0032] Optionally, set the compressed air pressure according to the following empirical formula based on the amount of fragrance added:

[0033] F i = ;

[0034] Where: Fi is the compressed air pressure when a certain fragrance is applied, in MPa; F is the assumed compressed air pressure, in MPa; G is the assumed fragrance amount of a certain fragrance, in g; G i The actual amount of a certain fragrance added.

[0035] Optionally, after setting a number of key parameters on the control panel, weight calibration is also performed, including:

[0036] Zero point calibration: Place the empty fragrance can on the weighing module and click "Zero point mark";

[0037] Full point calibration: Fill the aroma tank with a set weight of liquid, enter the liquid weight in "Full point weight", and then click "Full point mark".

[0038] Optionally, flavor charging control is performed based on a number of key parameters, including:

[0039] Automatic feeding before production: The spices are transported from the storage tank to the spice tank through a pneumatic diaphragm pump. When the weight of the spices in the spice buffer tank reaches the high level, the system automatically stops feeding;

[0040] Automatic feeding during production: When the spice material level is detected to be lower than the low level, the system automatically feeds; when the material level reaches the high level, the system automatically stops feeding;

[0041] When the automatic loading is completed, the metering is restarted and the weight loss method is used to monitor the flow and perform flow compensation.

[0042] Optionally, based on the received linkage signal, a plurality of valves are controlled to open to apply the fragrance on the surface of the sheet, including:

[0043] When the fragrance adding system receives the linkage signal for starting, the electric stop valve, electric reversing valve, gear pump, back pressure valve and electric reversing valve installed on the fragrance adding pipeline are opened, and the compressed air pipeline for atomizing fragrance is opened to atomize fragrance and apply fragrance to the surface of the sheet;

[0044] The fragrance condensed on the inner surface of the fragrance adding cavity during atomization is gathered to the reflux port by gravity and recovered to the residual liquid tank through the recovery pipeline.

[0045] The flavoring production control method for cigarettes disclosed in the present invention has the following technical effects:

[0046] By tracking and comparing the timely flavoring flow rate with the theoretical flavoring flow rate, calculating, tracking and compensating, the flavoring accuracy can be controlled within a very small error range. Furthermore, the flavoring amount is calculated based on the product process requirements, and the timely flavoring flow rate is calculated in combination with the timely vehicle speed to ensure that the flavoring accuracy is consistent with the characteristics of heated cigarettes and avoid the errors caused by the traditional weight percentage flavoring method;

[0047] Zero-point calibration and full-point calibration during debugging can ensure that the calculation error of the fragrance amount is minimized, so that the system can control the fragrance dosage more accurately and improve the stability of product quality;

[0048] Open the pipeline pre-filling to ensure that the pipeline is full of fragrance, avoid the deviation of fragrance amount caused by empty or partially filled pipeline, and achieve high-precision fragrance addition.

[0049] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0051] Figure 1 A schematic diagram of a method for controlling the flavoring production of cigarettes provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0053] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0054] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0055] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0056] The present invention proposes an embodiment of a method for controlling the production of flavoring cigarettes. Specifically, Figure 1 As shown, the following steps are included:

[0057] Pour the spices into the spice storage tank according to product requirements;

[0058] Start the power supply, the power light will turn on, and the system will automatically detect whether all parts of the fragrance adding system are normal;

[0059] According to production needs, the selection switch is rotated to the set position, which includes three positions: automatic mode, manual mode, and cleaning mode. When adding fragrance, the selection switch is rotated to the automatic position;

[0060] It should be noted that the three positions of the selection switch correspond to three modes, specifically including:

[0061] Automatic mode: When enabled, the "Automatic" indicator lights up and the system runs in "Automatic mode". In this mode, the system detects the running speed of the sheet in real time, calculates the timely theoretical aromatherapy flow rate, tracks the timely theoretical aromatherapy flow rate and aromatizes the running sheet, and compares the timely aromatherapy flow rate with the theoretical aromatherapy flow rate, and calculates, tracks and compensates to ensure aromatization accuracy;

[0062] Manual mode: When the manual mode indicator is on, the system adds fragrance to the running slices according to the fragrance flow setting parameters. The slice running speed defaults to the manual virtual speed setting. This mode can be used for fragrance under specific conditions (fixed speed); it can also be used for simulation adjustment and verification of the system before formal production;

[0063] Cleaning mode: When the cleaning mode indicator is on, the system runs in "cleaning mode". In this mode, the servo pump runs at a fixed speed, usually 1000RPM. You need to select "cleaning tank or spice tank" on the control panel. When the system needs to be exhausted, select "pressure reduction exhaust".

[0064] Set multiple key parameters on the control panel;

[0065] Spice feeding control based on multiple key parameters;

[0066] Pre-fill the fragrance; at the beginning of production, click "depressurization and exhaust" to start the pipeline pre-filling, ensure that the pipeline is full of fragrance, make the flow value of the metering system accurately reflect the actual flow of the added slices, avoid the fragrance amount deviation caused by the empty pipe or partial filling of the pipeline, which is the key pre-step to achieve high-precision fragrance. The back pressure valve automatically returns to zero, which is conducive to the smooth flow of fragrance to fill the pipeline. The stop operation after pre-filling is completed is simple and efficient, providing a reliable initial state for subsequent stable production.

[0067] Based on the received linkage signal, multiple valves are controlled to open to apply the fragrance to the surface of the sheet;

[0068] When receiving the cigarette machine stop signal, the flavoring system automatically stops flavoring.

[0069] In an embodiment of the present invention, multiple key parameter settings are performed on the control panel, including:

[0070] Set the high and low material level weight, fragrance addition amount, compressed air pressure and other parameters of the spice tank on the control panel;

[0071] Select the fragrance curve and fragrance method;

[0072] Turn on the automatic stirring function to mix the fragrance liquid evenly;

[0073] Set the heating temperature and start the heating program to heat the spices to the set temperature.

[0074] The high and low levels of the spice tank can be displayed on the control panel. The level uses a weight signal. The high level prevents the spices from overflowing during automatic loading, and the low level controls when to load automatically.

[0075] In an embodiment of the present invention, setting the fragrance amount on the control panel specifically includes:

[0076] G= ;

[0077] Where G is the amount of fragrance added, in g / m; m is the weight of the flakes, in g / m 2 , obtained through physical inspection or process requirements; c is the width of the slice, obtained through physical inspection or process requirements; the unit is m; a is the flavoring ratio (the weight ratio of the flavor to the slice), the unit is %;

[0078] During production, the aroma flow rate is automatically calculated based on the detected vehicle speed. The formula is as follows:

[0079] L= ;

[0080] In the formula: L is the timely fragrance flow rate, unit is g / min, G is the fragrance amount, unit is g / m; v is the timely vehicle speed, unit is m / min.

[0081] In the embodiment of the present invention, the compressed air pressure is set according to the following empirical formula based on the amount of fragrance added:

[0082] F i = ;

[0083] Where: Fi is the compressed air pressure when a certain fragrance is applied, in MPa; F is the assumed compressed air pressure, in MPa; G is the assumed fragrance amount of a certain fragrance, in g; G i The actual amount of a certain fragrance added.

[0084] Specifically, the selected flavoring curve refers to a curve showing the relationship between the gear pump speed and the output flow rate, which is used to improve the accuracy of the gear pump speed response and the flavoring precision. The flavoring curve can be established before production and can be selected during production.

[0085] In the continuous flavoring and rolling production process of online slice flavoring, the flavoring accuracy plays a decisive role in the sensory quality of heated cigarettes, so the accuracy of each flavoring must be ensured. As a key component of the flavoring system, the output flow of the gear pump is presented as a volume flow rate, which is proportional to the rotation speed. The main factors affecting the output flow of the gear pump include the leakage of the pump, the density and viscosity of the flavor. Similarly, when the gear pump has good performance and the density and viscosity of the flavor are fixed, the fluctuation of the system pressure will also cause the output flow of the pump to change.

[0086] Given that different fragrance liquids have different viscosities and densities, when the gear pump runs at the same speed, its output flow and pressure will show significant differences, which will undoubtedly have a negative impact on the accuracy of flow tracking and fragrance addition. By constructing a fragrance characteristic curve, the speed response capability of the gear pump can be improved, thereby ensuring the accuracy of the output flow.

[0087] The creation of a perfuming curve consists of the following steps:

[0088] (1) Select the "storage location" of the fragrance curve on the control panel; Edit the name of the current fragrance curve;

[0089] (2) Edit the maximum aromatherapy flow rate g / min; the flow rate calculation method is as follows:

[0090] Fragrance flow rate = feed ratio (%) Quantitative weight (g / m 2 ) Width (m) Rated speed (m / min);

[0091] The addition ratio is generally between 1% and 6%, which is the product process requirement; the flake weight is generally (100-150) g / m 2 , which is the product process requirement, the width is generally 0.15m; the vehicle speed is generally not higher than 75 m / min (the rated vehicle speed is generally 5000 sticks / min, and the length of the smoking section is 0.015m); therefore, the maximum flow rate range is (11-102) g / min; in order to shorten the time for establishing the flow curve, the maximum flow rate can be set according to the feeding ratio;

[0092] (3) Turn the selector switch to the "cleaning" position and click the "start" button to start the system. At this time, the gear pump starts and the fragrance is recovered from the fragrance tank through the fragrance pipe, fragrance cavity and recovery pipe to the storage tank.

[0093] The system automatically adjusts the gear pump speed from zero to the set maximum speed, and automatically draws a flow-speed curve on the spice curve interface and records the corresponding data; to ensure the accuracy of the flow curve, the flow accuracy establishment time is controlled at the same time; the speed adjustment judgment method is based on the cumulative weight of the spices within a certain period of time and the gear pump running time for double judgment; that is, the cumulative flow and running time are set in the system;

[0094] When the system detects that the cumulative flow of fragrance per unit time reaches the set value, the gear pump automatically adjusts to the next speed; the set value is generally selected within the range of (0.5-1.0) g. The larger the fragrance flow, the higher the set value; it can be calculated according to the following formula:

[0095] L= t;

[0096] In the formula: L is the timely fragrance flow rate, unit is g / s; G is the fragrance amount, unit is g / m; v is the timely vehicle speed, unit is m / min; t is time, value is 2 seconds; when the gear pump running time reaches the cumulative time of 2 seconds, the gear pump automatically adjusts to the next speed.

[0097] When the gear pump speed runs from startup to the set maximum speed, the system automatically stops, completes the establishment of the flavor curve, and automatically saves it. The relationship between the gear pump speed and the output flow rate is used to accurately control the flavoring process, improve the gear pump response speed and flavoring accuracy, and ensure stable and accurate flavoring under complex production conditions such as different flavors, vehicle speeds, and sheet specifications, thereby improving production adaptability and flexibility.

[0098] In the embodiment of the present invention, after multiple key parameters are set on the control panel, weight calibration is also performed, specifically including:

[0099] Zero point calibration: Place the empty fragrance can on the weighing module and click "Zero point mark";

[0100] Full point calibration: put the set weight of liquid into the aroma tank, enter the liquid weight in "full point weight", and then click "full point mark". Accurate weight calibration can ensure that the calculation error of aroma amount is minimized. Calibration is not required during production, which reduces unnecessary operation processes and improves production efficiency.

[0101] In an embodiment of the present invention, the spice loading control is performed based on multiple key parameters, including:

[0102] Automatic loading before production: Click the "Automatic loading" button on the control panel, the valve of the spice delivery pipeline opens, the pneumatic diaphragm pump starts, and the spices are transported from the storage tank to the spice tank. When the weight of the spices in the spice buffer tank reaches the high material level, the system automatically stops loading;

[0103] Automatic feeding during production: When the system detects that the spice material level is lower than the low level, the system automatically feeds, and when the material level reaches the high level, the system automatically stops feeding; during the automatic feeding process, the material tank weight information system is automatically shielded and does not participate in system control. At this time, the system does not perform flow compensation, but only tracks the theoretical flow;

[0104] When the automatic loading is completed, the system recovers and restarts metering, using the weight loss method to monitor the flow and perform flow compensation.

[0105] In an embodiment of the present invention, based on the received linkage signal, multiple valves are controlled to open to apply fragrance on the surface of the sheet, including:

[0106] When the fragrance system receives the start-up linkage signal, the electric stop valve, electric reversing valve, gear pump, back pressure valve and electric reversing valve installed on the fragrance pipeline are opened, and the compressed air pipeline for atomizing fragrance is opened to atomize the fragrance and apply the fragrance to the surface of the slice; each link works closely together to achieve efficient and precise fragrance addition, ensuring consistent fragrance quality for each slice.

[0107] During atomization, the fragrance condensed on the inner surface of the fragrance chamber is gathered to the reflux port by gravity and recovered to the residual liquid tank through the recovery pipeline. This avoids the waste of fragrance and prevents the residual condensed fragrance from affecting the subsequent fragrance and product quality, maintains a clean production environment, and ensures the continuous and stable operation of the system.

[0108] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A method for controlling the production of flavoring cigarettes, characterized in that: The following steps are involved: Pour the spices into the spice storage tank according to product requirements; According to production needs, rotate the selection switch to the set position, which includes three positions: automatic mode, manual mode, and cleaning mode; Set multiple key parameters on the control panel; Spice feeding control based on multiple key parameters; Carry out spice pre-filling; Based on the received linkage signal, multiple valves are controlled to open to apply the fragrance to the surface of the sheet; When receiving the cigarette machine stop signal, the flavoring system automatically stops flavoring.

2. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: The three positions of the selection switch correspond to three modes, specifically including: Automatic mode: The system detects the running speed of the slices in real time, calculates the theoretical aromatherapy flow rate, and aromatizes the running slices based on the theoretical aromatherapy flow rate. At the same time, the timely aromatherapy flow rate is compared with the theoretical aromatherapy flow rate for compensation; Manual mode: The running slices are scented according to the scenting flow setting parameters, and the slice running speed defaults to the manual virtual vehicle speed setting; Cleaning mode: Set the servo pump speed to a fixed value and select the cleaning item on the control panel.

3. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: After pouring the spices into the spice storage tank according to product requirements, it also includes: Start the power supply, the power light will turn on, and the system will automatically detect whether all parts of the fragrance adding system are normal.

4. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: Several key parameter settings can be made on the control panel, including: Set the weight of the high and low levels of the spice tank, the amount of fragrance added, and the compressed air pressure on the control panel; Select the fragrance curve and fragrance method; Turn on the automatic stirring function to mix the fragrance liquid evenly; Set the heating temperature and start the heating program to heat the spices to the set temperature.

5. The method for controlling the production of flavoring cigarettes according to claim 4, characterized in that: Set the fragrance amount on the control panel, including: G= ； Where G is the amount of fragrance added, in g / m; m is the weight of the flakes, in g / m 2 , obtained through physical inspection or process requirements; c is the width of the sheet, obtained through physical inspection or process requirements; the unit is m; a is the fragrance ratio, the unit is %; During production, the aroma flow rate is automatically calculated based on the detected vehicle speed. The formula is as follows: L= ； In the formula: L is the timely fragrance flow rate, unit is g / min, G is the fragrance amount, unit is g / m; v is the timely vehicle speed, unit is m / min.

6. The method for controlling the production of flavoring cigarettes according to claim 4, characterized in that: Set the compressed air pressure according to the following empirical formula based on the amount of fragrance added: F i = ； Where: Fi is the compressed air pressure when a certain fragrance is applied, in MPa; F is the assumed compressed air pressure, in MPa; G is the assumed fragrance amount of a certain fragrance, in g; G i The actual amount of a certain fragrance added.

7. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: After setting a number of key parameters on the control panel, weight calibration is also required, including: Zero point calibration: Place the empty fragrance can on the weighing module and click "Zero point mark"; Full point calibration: Fill the aroma tank with a set weight of liquid, enter the liquid weight in "Full point weight", and then click "Full point mark".

8. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: Spice dosing control based on a number of key parameters, including: Automatic feeding before production: The spices are transported from the storage tank to the spice tank through a pneumatic diaphragm pump. When the weight of the spices in the spice buffer tank reaches the high level, the system automatically stops feeding; Automatic feeding during production: When the spice material level is detected to be lower than the low level, the system automatically feeds; when the material level reaches the high level, the system automatically stops feeding; When the automatic loading is completed, the metering is restarted and the weight loss method is used to monitor the flow and perform flow compensation.

9. The method for controlling the production of flavoring cigarettes according to claim 1, characterized in that: Based on the received linkage signal, multiple valves are controlled to open to apply the fragrance to the surface of the sheet, including: When the fragrance adding system receives the linkage signal for starting, the electric stop valve, electric reversing valve, gear pump, back pressure valve and electric reversing valve installed on the fragrance adding pipeline are opened, and the compressed air pipeline for atomizing fragrance is opened to atomize fragrance and apply fragrance to the surface of the sheet; The fragrance condensed on the inner surface of the fragrance adding cavity during atomization is gathered to the reflux port by gravity and recovered to the residual liquid tank through the recovery pipeline.

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