Method for establishing cigarette flavoring characteristic curve

Abstract

The invention discloses a method for establishing a cigarette perfuming characteristic curve, and belongs to the technical field of tobacco production and processing.The method comprises the following steps that a perfuming flow initial value and compressed air pressure of atomized perfume are set; perfume is conveyed from the perfume tank to the perfume buffer tank through the perfume conveying pipeline system; determining the back pressure of the output end of the gear pump according to the viscosity of the feed liquid, and outputting pressure and flow by using a back pressure valve; the gear pump is driven to run from the first speed interval to the second speed interval, data information of the gear pump speed value, the compressed air pressure and the perfuming flow is obtained, and a corresponding relation curve is established; and controlling the response speed and the instantaneous perfuming precision of the charging pump based on the corresponding relation curve. According to the invention, the gear pump can output stable and reliable pressure and flow under various feed liquid viscosity conditions, and the accuracy of the perfuming process is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco production and processing, and more specifically, to a method for establishing a cigarette flavoring characteristic curve. Background Art

[0002] In recent years, the sales volume of heated cigarette products has continued to grow globally. In 2023, the global heated cigarette market size reached US$35.2 billion, an increase from 2022. The United States is an important potential market. Among them, the smoking segments of ordered heated cigarettes are arranged in an orderly and regular manner vertically, which contrasts with the disordered and irregular arrangement of disordered heated cigarettes. In addition, the smoke composition of ordered heated cigarettes is relatively controllable, and there are fewer harmful substances than traditional cigarettes. In the tobacco industry, many fields of ordered heated cigarettes have become research hotspots, covering aspects such as smoking material formulation technology, processing technology, quality control, flavoring technology, rolling equipment, and film base machine adaptability.

[0003] As for the flavoring process of sequentially heated cigarettes, the current practice commonly adopted in the industry is to apply flavoring after the slitting process and before the closing process in the process of unwinding and rolling the smoking materials. However, in the actual production practice, the problem of poor flavoring accuracy is exposed, and the instantaneous error can even reach more than 10%, which has a direct negative impact on the shaping of the unique style of the product and the overall quality level.

[0004] After in-depth research, it was found that flavoring in the unwinding and winding process belongs to the category of micro-flow flavoring. The flavoring flow rate will change accordingly with the change of production vehicle speed, and there is an obvious lag when tracking the change of vehicle speed, which will have an adverse effect on the accuracy of flavoring. The flavoring ratio required by heated cigarettes of different flavors is quite different, generally ranging from 1.5% to 6%. The difference in the viscosity of the flavoring liquid and the difference in the flavoring ratio will cause the output pressure of the gear pump to fluctuate, which will cause obvious differences in the accuracy of flavoring and the actual effect of flavoring. Therefore, how to explore a more accurate and effective flavoring control method is an important issue that needs to be solved in the current field of tobacco technology research and development. Summary of the invention

[0005] One object of the present invention is to provide a method for establishing a cigarette flavoring characteristic curve to solve the above-mentioned problem that the output pressure of the gear pump fluctuates, resulting in obvious differences in flavoring accuracy and actual flavoring results.

[0006] According to the present invention, a method for establishing a cigarette flavoring characteristic curve is provided, comprising the following steps:

[0007] Set the initial value of the aromatherapy flow rate and the compressed air pressure for atomizing aromas;

[0008] conveying spices from the spice tank to the spice buffer tank through the spice conveying pipeline system;

[0009] Determine the back pressure at the output end of the gear pump according to the viscosity of the liquid, and use the back pressure valve to output the pressure and flow;

[0010] The gear pump is driven to run from the first speed interval to the second speed interval, and the gear pump speed value, compressed air pressure and fragrance flow data information are obtained. According to the obtained data information, a corresponding relationship curve among the gear pump speed value, compressed air pressure and fragrance flow is established.

[0011] Optionally, the method for establishing a cigarette flavoring characteristic curve further includes: controlling the response speed and instantaneous flavoring accuracy of a feeding pump based on the established corresponding relationship curve.

[0012] Optionally, the initial value of the aromatizing flow rate is calculated according to the following weight ratio conversion formula:

[0013] L = m × c × v × a;

[0014] Where: L is the spice flow rate, in g / min; m is the sheet weight, in g / m²; c is the sheet width, in m; v is the vehicle speed, in m / min; a is the weight ratio of spice to sheet, in %.

[0015] Optionally, in the step of conveying the spices from the spice tank to the spice buffer tank through the spice conveying pipeline system, the gear pump is controlled to convey the spices from the spice tank to the spice buffer tank with a weighing module through the spice conveying pipeline system until the material level reaches a preset material level, and the pre-filling is stopped.

[0016] Optionally, the step of determining the back pressure at the output end of the gear pump according to the viscosity of the slurry includes:

[0017] When the viscosity of the liquid is less than or equal to the first viscosity threshold, the back pressure is controlled within the first back pressure range;

[0018] When the viscosity of the slurry is greater than the first viscosity threshold and less than the second viscosity threshold, the back pressure is controlled within the second back pressure range;

[0019] When the viscosity of the liquid is greater than or equal to the second viscosity threshold, the back pressure is controlled within the third back pressure range.

[0020] Optionally, the first viscosity threshold is set to 50 mPa.s, and the first back pressure range is set to 0.65-0.8 MPa;

[0021] The second viscosity threshold is set to 100 mPa.s, and the second back pressure range is set to 0.55-0.65 MPa;

[0022] The third back pressure range is set to 0.3-0.55Mpa.

[0023] Optionally, the second speed interval includes a rated speed of the gear pump.

[0024] Optionally, controlling the response speed and instantaneous fragrance adding accuracy of the feeding pump based on the established corresponding relationship curve specifically includes:

[0025] Curve positioning based on real-time monitored compressed air pressure;

[0026] Set the aromatizing flow target value and obtain the gear pump speed range that meets the target requirements;

[0027] According to the speed range of the gear pump, adjust the voltage and current of the drive motor and adjust the speed of the gear pump to the target range;

[0028] Continuously monitor the gear pump speed, compressed air pressure and aromatherapy flow parameters. When the parameter changes exceed the threshold, return to the corresponding relationship curve for positioning based on the difference feedback between the compressed air pressure and the aromatherapy flow, and adjust the gear pump speed again.

[0029] The method for establishing a cigarette flavoring characteristic curve disclosed in the present invention has the following technical effects:

[0030] By accurately measuring the viscosity of the liquid, and according to the different viscosity threshold ranges (such as ≤50mPa.s, 50-100mPa.s, ≥100mPa.s), the back pressure is controlled in the corresponding precise range (0.65-0.8MPa, 0.55-0.65MPa, 0.3-0.55Mpa), and the back pressure valve is used to output pressure and flow steadily. It can effectively offset the negative impact of viscosity changes, ensure that the gear pump can output stable and reliable pressure and flow under various liquid viscosity conditions, greatly improve the accuracy of the flavoring process, and thus ensure the stability of cigarette product quality.

[0031] On the other hand, by positioning the curve according to the compressed air pressure monitored in real time, the curve branch corresponding to the current working condition can be quickly locked. Next, after setting the target value of the flavoring flow rate, the gear pump speed range that meets the target demand can be accurately obtained. The operator adjusts the voltage and current of the drive motor accordingly, and quickly adjusts the gear pump speed to the target range to achieve a rapid response of the feeding pump to the flavoring demand. In addition, the gear pump speed, compressed air pressure and flavoring flow parameters are continuously monitored during the production process. Once the parameter change exceeds the threshold, the difference between the compressed air pressure and the flavoring flow rate is immediately fed back, and the corresponding relationship curve is returned for positioning, and the gear pump speed is adjusted again. This dynamic real-time fine-tuning mechanism ensures that the instantaneous flavoring accuracy is always maintained at a high level in a complex and changing production environment, ensuring the consistency and high quality of the taste of cigarette products.

[0032] 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

[0033] 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.

[0034] Figure 1 A schematic flow chart of a method for establishing a cigarette flavoring characteristic curve provided by an embodiment of the present invention;

[0035] Figure 2 This is a corresponding relationship curve diagram in the method for establishing a cigarette flavoring characteristic curve provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0040] The present invention proposes an embodiment of a method for establishing a cigarette flavoring characteristic curve. Specifically, Figure 1 As shown, the following steps are included:

[0041] Set the initial value of the flavoring flow rate and the compressed air pressure for atomizing flavors; it should be noted that the pressure is adapted according to the physical properties of the flavor such as viscosity. If the flavor has high viscosity, increasing the compressed air pressure can break the flavor into tiny uniform droplets. The atomized flavor molecules are easier to disperse evenly in the air, and when entering the cigarette material, they can contact the material surface in all directions, greatly improving the adsorption efficiency.

[0042] The spices are transported from the spice tank to the spice buffer tank through the spice delivery pipeline system. It should be noted that the spice buffer tank buffers the spice flow rate fluctuations caused by factors such as the start and stop of the gear pump and changes in pipeline pressure, so that the spice flow entering the subsequent flavoring link is stable and uniform, and provides temporary storage space for the subsequent flavoring process.

[0043] The back pressure at the output end of the gear pump is determined according to the viscosity of the liquid, and the back pressure valve is used to output the pressure and flow. It should be noted that a high-precision viscosity meter is equipped to detect the viscosity of the liquid in real time, and the control system accurately adjusts the back pressure valve accordingly. This ensures that the gear pump can stably output pressure and flow under various liquid viscosities, so that the flavor supply received in the cigarette flavoring process is uniform and stable, ensuring product quality consistency.

[0044] The gear pump is driven to run from the first speed interval to the second speed interval, and the gear pump speed value, compressed air pressure and aromatherapy flow data information are obtained. According to the obtained data information, a corresponding relationship curve between the gear pump speed value, compressed air pressure and aromatherapy flow is established. It should be noted that the gear pump is driven to run from a low-speed starting interval close to zero flow (such as 0-500 r / min) to a high-speed interval covering the rated speed (assuming the rated speed is 4000 r / min, the interval is 2000-4000r / min) to simulate the full working conditions of the production line. In this process, high-precision sensors collect the gear pump speed value, compressed air pressure and aromatherapy flow data in real time and synchronously, reflecting the inherent correlation of various parameters under different working conditions. Furthermore, based on the massive data collected, a corresponding relationship curve is constructed through a big data processing algorithm, and displayed on the control system display screen in a visual graphic. The operator quickly adjusts the parameters under different production conditions based on the corresponding relationship curve. If the speed of the production line suddenly increases, resulting in a change in the required flavoring flow rate, the operator can locate the curve according to the real-time compressed air pressure, quickly find the speed range of the gear pump, adjust the voltage and current of the drive motor, and accurately adjust the speed to achieve dynamic optimization of flavoring accuracy. This ensures that cigarettes always maintain high flavoring accuracy, maintain a stable taste, and improve product quality in a complex and changeable production environment.

[0045] In an embodiment of the present invention, the method for establishing a cigarette flavoring characteristic curve further includes:

[0046] Based on the established corresponding relationship curve, the response speed and instantaneous flavoring accuracy of the feeding pump are controlled. It should be noted that the gear pump speed, compressed air pressure and flavoring flow parameters are continuously monitored. Once the flow change exceeds the preset threshold, the difference between the real-time compressed air pressure and the flavoring flow is immediately fed back, and the corresponding relationship curve is returned to reposition. For example, the compressed air pressure is maintained at 0.35MPa, but the flavoring flow is 5% higher than the theoretical value. The system finds a suitable lower gear pump speed range in the curve based on the new situation, and accurately adjusts the speed again to offset the impact of viscosity changes, ensuring that the instantaneous flavoring accuracy is always maintained in a high-precision range, and ensuring the consistency of cigarette taste.

[0047] In the embodiment of the present invention, the initial value of the aromatizing flow rate is calculated according to the following weight ratio conversion formula:

[0048] L = m × c × v × a;

[0049] Where: L is the spice flow rate, in g / min; m is the sheet weight, in g / m²; c is the sheet width, in m; v is the vehicle speed, in m / min; a is the weight ratio of spice to sheet, in %.

[0050] Specifically, for example, the vehicle speed is 80 m / min, the sheet weight is 30 g / m², the sheet width is 0.5 m, and the weight ratio of flavoring to sheet is 8%. The formula is used to calculate that the initial value of the flavoring flow rate is set to 96 g / min, which provides a benchmark for subsequent precise flavoring and ensures the stability of the flavor of each cigarette.

[0051] In an embodiment of the present invention, in the step of conveying spices from the spice tank to the spice buffer tank through the spice conveying pipeline system, the gear pump is controlled to convey the spices from the spice tank to the spice buffer tank with the weighing module through the spice conveying pipeline system until the material level reaches the preset material level, and the pre-filling is stopped. It should be noted that during the conveying process, the gear pump, as a power source, operates stably according to the preset flow rate and flow rate, and pushes the spices from the spice tank to the buffer tank continuously. The weighing module monitors the weight of the spices flowing in in real time. When the weight gradually accumulates and approaches or reaches the value corresponding to the preset material level, the system immediately issues an instruction to stop the gear pump and stop pre-filling. For example, the preset material level is set to correspond to a 150kg spice weight. Once the weighing module detects that the weight reaches about 149.5kg, the gear pump will quickly stop running.

[0052] In an embodiment of the present invention, the step of determining the back pressure at the output end of the gear pump according to the viscosity of the liquid includes:

[0053] When the viscosity of the liquid is less than or equal to the first viscosity threshold, the back pressure is controlled within the first back pressure range;

[0054] When the viscosity of the slurry is greater than the first viscosity threshold and less than the second viscosity threshold, the back pressure is controlled within the second back pressure range;

[0055] When the viscosity of the liquid is greater than or equal to the second viscosity threshold, the back pressure is controlled within the third back pressure range.

[0056] In an embodiment of the present invention, the first viscosity threshold is set to 50 mPa.s, and the first back pressure range is set to 0.65-0.8 MPa;

[0057] The second viscosity threshold is set to 100 mPa.s, and the second back pressure range is set to 0.55-0.65 MPa;

[0058] The third back pressure range is set to 0.3-0.55Mpa.

[0059] Precise back pressure control ensures that the gear pump can always output stable and reliable pressure and flow when facing different liquid viscosities. For cigarettes produced in different batches and at different time periods, even if the viscosity of the flavors used is different, as long as the viscosity threshold and back pressure range are strictly controlled, the flavoring effect can be highly consistent.

[0060] In an embodiment of the present invention, the second speed interval includes the rated speed of the gear pump. Specifically, the rated speed is configured to be 4000 r / min.

[0061] like Figure 2 The graph shows the corresponding relationship between the viscosity of the spice, the speed of the gear pump and the output flow rate. The title of the graph is "Flow rate at rated viscosity". The horizontal axis of the graph represents viscosity (Viscosity), the unit is millipascal second (mPas), ranging from 1 to 10000. The vertical axis represents the flow rate (Flow Rate), the unit is liters per minute (L / min), ranging from 0 to 0.8. There are six different broken lines in the graph, each of which represents the relationship between the flow rate and the viscosity of the spice at different speeds (RPM), and the pressure corresponding to all data points is 1 bar. The details are as follows:

[0062] The first line represents a rotation speed of 65 RPM. The flow rate increases rapidly when the viscosity is low (about 1 to 10 mPas), and then the flow rate gradually stabilizes when the viscosity is high (about 1000 to 10000 mPas).

[0063] The second broken line represents a rotation speed of 750 RPM. This broken line has a low flow rate when the viscosity is low. As the viscosity increases, the flow rate gradually increases and tends to be stable at high viscosity.

[0064] The third broken line represents a rotation speed of 1500 RPM. This broken line has a low flow rate when the viscosity is low. As the viscosity increases, the flow rate gradually increases and tends to be stable at high viscosity.

[0065] The fourth broken line represents a rotation speed of 2250 RPM. This broken line has a low flow rate when the viscosity is low. As the viscosity increases, the flow rate gradually increases and tends to be stable at high viscosity.

[0066] The fifth broken line represents a rotation speed of 3000 RPM. This broken line has a low flow rate when the viscosity is low. As the viscosity increases, the flow rate gradually increases and tends to be stable at high viscosity.

[0067] The sixth broken line represents a rotation speed of 3500 RPM. This broken line has a low flow rate when the viscosity is low. As the viscosity increases, the flow rate gradually increases and tends to be stable at high viscosity.

[0068] As can be seen from the figure, with the increase of rotation speed, the flow rate also increases accordingly at the same viscosity. And at low viscosity, the increase of flow rate is large, while at high viscosity, the increase of flow rate gradually decreases and eventually tends to be stable.

[0069] In the embodiment of the present invention, the response speed and instantaneous fragrance adding accuracy of the feeding pump are controlled based on the established corresponding relationship curve, specifically including:

[0070] First, the current production instruction is received, which contains key information such as vehicle speed and required fragrance ratio. At the same time, the controller quickly retrieves the pre-set processing parameters such as the sheet quantity and sheet width. For example, the current vehicle speed is (v) (unit: (m / min)), the sheet quantity is (m) (unit: (g / m²)), the sheet width is (c) (unit: (m)), and the fragrance ratio requirement is (a) (unit: %). According to the fragrance flow calculation formula (L = m × c × v × a), the fragrance flow target value (L) (unit: (g / min)) required at this moment is accurately calculated.

[0071] Curve positioning is performed based on the compressed air pressure monitored in real time by the sensor;

[0072] Set the aromatizing flow target value and obtain the gear pump speed range that meets the target requirements;

[0073] It should be noted that in a coordinate system with the gear pump speed value as the horizontal axis and the aromatherapy flow rate as the vertical axis, a number of corresponding relationship curves under different compressed air pressure conditions have been drawn. Along the corresponding relationship curve, according to the aromatherapy flow rate target value calculated previously, the gear pump speed range that meets the flow demand is quickly found and determined. According to the gear pump speed range, the voltage and current of the drive motor are adjusted to adjust the gear pump speed to the target range; the controller immediately sends a command to the gear pump according to the determined gear pump speed range, and quickly and accurately adjusts the gear pump speed to the target range by adjusting the voltage, current and other parameters of the drive motor.

[0074] The gear pump speed, compressed air pressure and flavoring flow parameters are continuously monitored. When the parameter changes exceed the threshold, the differential feedback between the compressed air pressure and the flavoring flow is used to return to the corresponding relationship curve for positioning and adjust the gear pump speed again. For example, if the vehicle speed suddenly increases, resulting in an increase in the required flavoring flow, the system quickly finds a new suitable gear pump speed in the curve according to the new situation and adjusts it immediately, so that during the instantaneous flavoring process, it can be fine-tuned in real time according to the dynamic changes of the system, greatly improving the accuracy of instantaneous flavoring and ensuring that each orderly heated cigarette can be evenly and accurately applied with flavoring.

[0075] 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 establishing a cigarette flavoring characteristic curve, characterized in that: The following steps are involved: Set the initial value of the aromatherapy flow rate and the compressed air pressure for atomizing aromas; conveying spices from the spice tank to the spice buffer tank through the spice conveying pipeline system; Determine the back pressure at the output end of the gear pump according to the viscosity of the liquid, and use the back pressure valve to output the pressure and flow; The gear pump is driven to run from the first speed interval to the second speed interval, and the gear pump speed value, compressed air pressure and fragrance flow data information are obtained. According to the obtained data information, a corresponding relationship curve among the gear pump speed value, compressed air pressure and fragrance flow is established.

2. The method for establishing a cigarette flavoring characteristic curve according to claim 1, characterized in that: Also includes: The response speed and instantaneous fragrance adding accuracy of the feeding pump are controlled based on the established corresponding relationship curve.

3. The method for establishing a cigarette flavoring characteristic curve according to claim 1, characterized in that: The initial value of the aromatherapy flow rate is calculated according to the following weight ratio conversion formula: L = m × c × v × a; Where: L is the spice flow rate, in g / min; m is the sheet weight, in g / m²; c is the sheet width, in m; v is the vehicle speed, in m / min; a is the weight ratio of spice to sheet, in %.

4. The method for establishing a cigarette flavoring characteristic curve according to claim 1, characterized in that: In the step of conveying the spices from the spice tank to the spice buffer tank through the spice conveying pipeline system, the gear pump is controlled to convey the spices from the spice tank to the spice buffer tank with a weighing module through the spice conveying pipeline system until the material level reaches a preset material level, and the pre-filling is stopped.

5. The method for establishing a cigarette flavoring characteristic curve according to claim 1, characterized in that: The step of determining the back pressure at the output end of the gear pump according to the viscosity of the liquid includes: When the viscosity of the liquid is less than or equal to the first viscosity threshold, the back pressure is controlled within the first back pressure range; When the viscosity of the slurry is greater than the first viscosity threshold and less than the second viscosity threshold, the back pressure is controlled within the second back pressure range; When the viscosity of the slurry is greater than or equal to the second viscosity threshold, the back pressure is controlled within a third back pressure range.

6. The method for establishing a cigarette flavoring characteristic curve according to claim 5, characterized in that: The first viscosity threshold is set to 50 mPa.s, and the first back pressure range is set to 0.65-0.8 MPa; The second viscosity threshold is set to 100 mPa.s, and the second back pressure range is set to 0.55-0.65 MPa; The third back pressure range is set to 0.3-0.55Mpa.

7. The method for establishing a cigarette flavoring characteristic curve according to claim 1, characterized in that: The second speed interval includes the rated speed of the gear pump.

8. The method for establishing a cigarette flavoring characteristic curve according to claim 2, characterized in that: Based on the established corresponding relationship curve, the response speed and instantaneous fragrance adding accuracy of the feeding pump are controlled, specifically including: Curve positioning based on real-time monitored compressed air pressure; Set the aromatizing flow target value and obtain the gear pump speed range that meets the target requirements; According to the speed range of the gear pump, adjust the voltage and current of the drive motor and adjust the speed of the gear pump to the target range; Continuously monitor the gear pump speed, compressed air pressure and aromatherapy flow parameters. When the parameter changes exceed the threshold, return to the corresponding relationship curve for positioning based on the difference feedback between the compressed air pressure and the aromatherapy flow, and adjust the gear pump speed again.

Images