Slurry spraying device for reconstituted tobacco dry process

Abstract

The invention provides a slurry spraying device for a reconstituted tobacco dry process. Comprising a storage tank, a metering pump, a self-cleaning nozzle and a net blanket, the material storage tank is suitable for containing slurry of a reconstituted tobacco dry process and water; the storage tank is connected with the self-cleaning spray head through a pipeline, and the metering pump is arranged on the pipeline and used for pumping materials in the storage tank to the self-cleaning spray head; the self-cleaning spray head is suitable for spraying slurry of a reconstituted tobacco dry process and suitable for spraying water; and the net blanket is used for receiving slurry or water of a reconstituted tobacco dry process provided by the self-cleaning nozzle. The device has two working modes, and the vertical and horizontal positions of a spray head (spray gun) can be freely adjusted in the production mode, so that the device meets the requirement of uniform liquid material spraying; in the cleaning mode, the high-pressure plunger pump can meet the cleaning work of the net blanket, and meanwhile the situation that nozzle holes are blocked can be effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of novel tobacco, and in particular relates to a slurry spraying device for a dry process of reconstituted tobacco leaves. Background Art

[0002] The dry-process reconstituted tobacco process involves the wood pulp being crushed through both coarse and fine grinding stages before being air-conveyed onto a mesh. A suction fan evenly adsorbs the pulp onto the mesh and compacts it into shape using rollers. A liquid mixture of tobacco powder, water, glycerin, and CMC is then sprayed onto the formed substrate. After drying, moisture and weight testing, and inspection for foreign matter, the reconstituted tobacco sheets are rolled or shredded and packaged.

[0003] Spraying is a crucial step in the dry-process production of reconstituted tobacco. Due to the high viscosity of the spray medium (liquid) and the insufficient delivery force of the pneumatic diaphragm pump used for spraying, nozzles are prone to clogging during the production process, resulting in uneven spraying and a direct impact on product quality. Furthermore, after production is completed, clean water is added to the batching tank and fed into the spraying system to clean the screens in the spraying section. Due to the high concentration of the liquid and the low spray force, a high amount of electricity is consumed to rotate the screens and a high amount of water is consumed to clean the screens for production.

[0004] In existing dry-process reconstituted tobacco production, the medium delivered by the spray system is a high-viscosity mixture of tobacco powder, water, glycerin, and CMC. During delivery, the pneumatic diaphragm pump's low transmission capacity easily causes nozzle clogging. Furthermore, during cleaning of the blanket at the end of production, the insufficient transmission capacity of the pneumatic diaphragm pump results in incomplete cleaning, requiring extended cleaning time to achieve the required cleaning standards, resulting in a waste of electricity and water resources. Summary of the Invention

[0005] The purpose of the present invention is to improve the efficiency of dry production of reconstituted tobacco, especially to improve the efficiency of the spraying stage and the cleaning stage, in order to solve the technical problem:

[0006] The present invention provides a slurry spraying device for a dry process of reconstituted tobacco leaves, comprising: a storage tank, a metering pump, a self-cleaning nozzle and a mesh blanket;

[0007] The storage tank is suitable for accommodating slurry for the dry process of reconstituted tobacco leaves and for holding water;

[0008] The material storage tank is connected to the self-cleaning nozzle through a pipeline, and a metering pump is provided in the pipeline to pump the material in the material storage tank to the self-cleaning nozzle;

[0009] The self-cleaning nozzle is suitable for spraying slurry in the dry process of reconstituted tobacco leaves, as well as for spraying water;

[0010] The mesh is used to receive slurry or water for the dry process of reconstituted tobacco provided by self-cleaning nozzles.

[0011] Furthermore, the metering pump is suitable for spraying materials with a shear viscosity of not less than 2000 mPa·s, not less than 1600 mPa·s, not less than 1400 mPa·s or not less than 1200 mPa·s.

[0012] Furthermore, the metering pump is a high-pressure plunger pump.

[0013] Furthermore, the high-pressure plunger pump refers to a plunger pump with a delivery pressure of 6.5MPa to 7.5MPa, 7.5MPa to 8.5MPa, and then 8.5MPa to 10MPa.

[0014] Furthermore, the self-cleaning nozzle is an air mixing spray gun.

[0015] Furthermore, it includes no less than 2, 3 or 4 self-cleaning nozzles.

[0016] The self-cleaning nozzles are connected in parallel.

[0017] Furthermore, it also includes a position adjustment mechanism;

[0018] The position adjustment mechanism is connected to the self-cleaning nozzle and is used for adjusting the relative position of the self-cleaning nozzle and the mesh blanket.

[0019] Furthermore, the position adjustment mechanism includes a horizontal movement mechanism and a vertical movement mechanism;

[0020] The vertical movement structure is used to adjust the vertical relative position of the self-cleaning nozzle and the mesh carpet. The vertical movement mechanism includes a first bearing, a first threaded shaft, a first housing, and a first connecting block. The first threaded shaft is vertically arranged in the first housing through the first bearing. The first connecting block is movably arranged on the first threaded shaft. When the first threaded shaft rotates, the first connecting block moves vertically without changing its posture. The first connecting block is connected to the first housing.

[0021] The horizontal moving structure is used to adjust the horizontal relative position of the self-cleaning nozzle and the mesh blanket; the horizontal moving mechanism includes a second bearing, a second threaded shaft, a second shell and a second connecting block. The second threaded shaft is horizontally arranged in the second shell through the second bearing. The second connecting block is movably arranged on the second threaded shaft. When the second threaded shaft rotates, the second connecting block moves horizontally without changing its posture. The second connecting block is connected to the self-cleaning nozzle.

[0022] Furthermore, the position adjustment mechanism further includes a driving member, which is used to drive the position adjustment mechanism to adjust the relative position of the self-cleaning nozzle and the mesh carpet;

[0023] The driving member includes a first driving member and a second driving member, the first driving member is used to drive and adjust the horizontal relative position of the self-cleaning nozzle and the mesh carpet, and the second driving member is used to drive and adjust the vertical relative position of the self-cleaning nozzle and the mesh carpet;

[0024] At least one of the first drive member and the second drive member is a servo motor.

[0025] Compared to existing technologies, the present invention offers at least the following advantages: It provides a multifunctional device for spraying materials and cleaning screens in a dry process for reconstituted tobacco leaves. It has two operating modes: in production mode, the vertical and horizontal positions of the spray head (spray gun) can be adjusted to ensure uniform liquid spraying; in cleaning mode, a high-pressure plunger pump cleans the screens while effectively preventing nozzle blockage.

[0026] The dry-process reconstituted tobacco technology referred to in this patent is a novel reconstituted tobacco production technology developed by drawing on dry-process papermaking technology. It represents a new development in the reconstituted tobacco industry. The process involves anhydrous defibrination of added fibers followed by a dry airflow multi-stage forming process to produce a base sheet. The tobacco raw material is then pre-treated by low-temperature pulverization and then mixed into a coating solution, which is then applied to the base sheet in multiple stages. Drying and slicing complete the dry-process reconstituted tobacco product.

[0027] Dry-process reconstituted tobacco technology utilizes clean air instead of water to form the substrate. The tobacco raw material is then pulverized and pretreated before being coated onto the substrate to form the finished product. This process represents an innovation and breakthrough in reconstituted tobacco technology, with the potential to drive the advancement of reconstituted tobacco technology. The production process, which includes non-hydrous fiber decomposition, dry airflow forming, and low-temperature pulverization and pretreatment of the tobacco raw material, significantly reduces water consumption and eliminates wastewater generation from the very beginning, resulting in clean and environmentally friendly production. Multi-stage dry airflow forming allows for the addition of a variety of materials, while the multi-stage coating process allows for flexible control of the product's physical and chemical properties. This flexible process opens up new possibilities for diverse product designs.

[0028] By low-temperature pulverizing tobacco raw materials and then mixing them into a coating solution for multi-stage coating, dry reconstituted tobacco leaf technology can efficiently replenish tobacco's active ingredients, ensuring the product's sensory quality while achieving a 100% tobacco yield. The multi-stage forming and coating process allows for precise control of the product's physical indicators, coating rate, and chemical parameters, ensuring stable product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above content and the following specific embodiments of the present invention will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed.

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention from one side;

[0031] Figure 2 is a cross-sectional schematic diagram of the vertical moving device in the present invention;

[0032] Figure 3 is a cross-sectional schematic diagram of the horizontal moving device in the present invention;

[0033] Figure 4 Schematic diagram of the three-dimensional structure of the tube array in the present invention;

[0034] Figure 5 Schematic diagram of the three-dimensional structure of the high-pressure plunger pump of the present invention;

[0035] Figure 6 is a cross-sectional schematic diagram of the first moving mechanism in the present invention;

[0036] Figure 7 It is a cross-sectional schematic diagram of the second moving mechanism in the present invention.

[0037] Description of reference numerals:

[0038] 1. Vertical moving device;

[0039] 101. First servo motor;

[0040] 102, upper bearing;

[0041] 103, threaded spindle;

[0042] 104, lower bearing;

[0043] 105. First moving mechanism;

[0044] 1051, fixing hole;

[0045] 1052, fourth thread;

[0046] 106. Vertical body shell;

[0047] 1061, vertical guide surface;

[0048] 2. Horizontal moving device;

[0049] 201, bottom bearing;

[0050] 202, threaded shaft;

[0051] 203, top bearing;

[0052] 204, second servo motor;

[0053] 205, horizontal body shell;

[0054] 2051, horizontal guide surface;

[0055] 206, second moving mechanism;

[0056] 2061, fifth thread;

[0057] 2062, sixth thread;

[0058] 3. Listing;

[0059] 301, spray gun tube;

[0060] 302, connecting bracket;

[0061] 303, air-mix spray gun;

[0062] 304, first thread;

[0063] 305, second thread;

[0064] 4. Pipe joints;

[0065] 5. High-pressure plunger pump;

[0066] 501, conveying metal hose;

[0067] 502, third thread;

[0068] 6. Storage tank;

[0069] 7. Net carpet. DETAILED DESCRIPTION

[0070] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, and the content is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the description, claims and drawings disclosed in this specification, those skilled in the art can easily understand the relevant purposes and advantages of the present invention.

[0071] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0072] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. The experimental methods described in the examples of the present invention are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following examples are all commercially available unless otherwise specified.

[0073] In the present invention, a slurry spraying device for a dry process of reconstituted tobacco includes: a storage tank 6, a metering pump, a self-cleaning nozzle and a mesh blanket 7; the storage tank 6 is suitable for accommodating slurry for the dry process of reconstituted tobacco, and is suitable for holding water; the storage tank 6 is connected to the self-cleaning nozzle through a pipeline, and the metering pump is arranged in the pipeline, which is used to pump the material in the storage tank 6 to the self-cleaning nozzle; the self-cleaning nozzle is suitable for spraying slurry for the dry process of reconstituted tobacco, and is suitable for spraying water; the mesh blanket 7 is used to receive the slurry or water for the dry process of reconstituted tobacco provided by the self-cleaning nozzle.

[0074] In some embodiments, the metering pump is a high-pressure plunger pump 5, which is suitable for spraying materials with a shear viscosity of not less than 2000 mPa·s, not less than 1600 mPa·s, not less than 1400 mPa·s or not less than 1200 mPa·s, and the delivery pressure is 6.5 MPa to 7.5 MPa, 7.5 MPa to 8.5 MPa, and then 8.5 MPa to 10 MPa.

[0075] Advantageously, the high-pressure plunger pump 5 can generate higher pressure under the same nozzle conditions, making the nozzle less likely to clog, improving atomization during cleaning of the blanket 7, and enabling full-day, long-duration operation. The high-pressure plunger pump 5 can easily handle high-viscosity coatings and is suitable for spraying slurries used in the dry process of reconstituted tobacco. The high-pressure plunger pump 5 can operate in harsh environments.

[0076] In some embodiments, the self-cleaning nozzle is a gas-mixing spray gun 303, which includes no less than 2, 3 or 4 self-cleaning nozzles, which are connected in parallel.

[0077] In some embodiments, the self-cleaning nozzle further includes a position adjustment mechanism connected to the self-cleaning nozzle for adjusting the relative position between the self-cleaning nozzle and the carpet 7. The position adjustment mechanism includes a horizontal movement mechanism, a vertical movement mechanism, and a drive element. The vertical movement mechanism is used to adjust the vertical relative position between the self-cleaning nozzle and the carpet 7. The vertical movement mechanism includes a first bearing, a first threaded shaft, a first housing, and a first connecting block. The first threaded shaft is vertically mounted within the first housing via the first bearing. The first connecting block is movably mounted on the first threaded shaft. When the first threaded shaft rotates, the first connecting block moves vertically while maintaining its position. The first connecting block is connected to the first housing. The horizontal movement mechanism is used to adjust the horizontal relative position between the self-cleaning nozzle and the carpet 7. The horizontal movement mechanism includes a second bearing, a second threaded shaft, a second housing, and a second connecting block. The second threaded shaft is horizontally mounted within the second housing via the second bearing. The second connecting block is movably mounted on the second threaded shaft. When the second threaded shaft rotates, the second connecting block moves horizontally while maintaining its position. The second connecting block is connected to the self-cleaning nozzle. The drive element drives the position adjustment mechanism to adjust the relative position between the self-cleaning nozzle and the carpet 7. The driving member includes a first driving member and a second driving member. The first driving member is used to drive and adjust the horizontal relative position of the self-cleaning nozzle and the mesh 7, and the second driving member is used to drive and adjust the vertical relative position of the self-cleaning nozzle and the mesh 7. At least one of the first driving member and the second driving member is a servo motor.

[0078] To further illustrate the present invention, the present invention provides specific embodiments as follows:

[0079] like Figures 1 to 7 The present invention relates to a slurry spraying device for a dry process of reconstituted tobacco leaves, which simultaneously has the functions of spraying materials in the dry process of reconstituted tobacco leaves and cleaning a mesh 7, and includes a vertical moving device 1, a horizontal moving device 2, a tube array 3, a pipe joint 4, a high-pressure plunger pump 5, a storage tank 6 and a mesh 7.

[0080] The present invention has two working modes. In the production mode, the vertical and horizontal positions of the nozzle (spray gun) can be adjusted arbitrarily to meet the requirements of uniform liquid spraying; in the cleaning mode, the high-pressure plunger pump can meet the cleaning work of the mesh 7 and effectively avoid the blockage of the nozzle hole.

[0081] By providing a high-pressure plunger pump 5, the present invention can effectively prevent clogging of the tube array 3 when conveying high-viscosity dry process materials. Furthermore, the present invention can fully utilize the reconstituted tobacco dry process material spraying device to clean the mesh 7 without requiring a separate cleaning structure. The vertical movement device 1 and horizontal movement device 2 of the reconstituted tobacco dry process material spraying device are simultaneously used to adjust the spraying parameters when producing different products to accommodate dry process materials of different formulations, and to flexibly adjust the position of the mesh 7 when cleaning. The present invention has a simple piping design; switching between production mode and cleaning mode requires only replacing the material in the storage tank 6, for example, replacing the reconstituted tobacco dry process material with warm water.

[0082] Among them, such as Figure 2 The vertical movement device 1 includes a first servo motor 101, an upper bearing 102, a threaded spindle 103, a lower bearing 104, a first movement mechanism 105, and a vertical housing 106. The upper end of the vertical housing 106 is equipped with the upper bearing 102, and the lower end is equipped with the lower bearing 104. The threaded spindle 103 is rotatably mounted between the upper bearing 102 and the lower bearing 104, and the first movement mechanism 105 is mounted on the threaded spindle 103.

[0083] The vertical housing 106 includes a vertical guide surface 1061 . The first moving mechanism 105 includes a fixing hole 1051 and a fourth thread 1052 .

[0084] The first servo motor 101 is in transmission connection with the threaded spindle 103 and can drive the threaded spindle 103 to rotate forward and reverse. Specifically, the first servo motor 101 is disposed at the end of the threaded spindle 103 and fixed on the vertical body housing 106.

[0085] The fourth thread 1052 is engaged with the threaded spindle 103 . When the threaded spindle 103 rotates, the first moving mechanism 105 moves vertically on the threaded spindle 103 accordingly under the guidance of the thread transmission and the vertical guide surface 1061 .

[0086] Specifically, the horizontal moving device 2 includes a bottom bearing 201 , a threaded shaft 202 , a top bearing 203 , a second servo motor 204 , a horizontal body housing 205 , and a second moving mechanism 206 .

[0087] like Figure 3 The left end of the horizontal body shell 205 is loaded with a top bearing 203, and the right end is loaded with a bottom bearing 201. The threaded shaft 202 is rotatably mounted between the top bearing 203 and the bottom bearing 201, and the second moving mechanism 206 is mounted on the threaded shaft 202.

[0088] The horizontal housing 205 includes a horizontal guide surface 2051. The second moving mechanism 206 includes a fifth thread 2061 and a sixth thread 2062.

[0089] The sixth thread 2062 is engaged with the threaded shaft 202 . When the threaded shaft 202 rotates, the second moving mechanism 206 moves horizontally on the threaded shaft 202 accordingly under the guidance of the thread transmission and the horizontal guide surface 2051 .

[0090] The second servo motor 204 is in transmission connection with the threaded shaft 202 and can drive the threaded shaft 202 to rotate forward and reverse. Specifically, the second servo motor 204 is arranged at the end of the threaded shaft 202 and fixed on the horizontal body shell 205.

[0091] The horizontal moving device 2 is installed on the first moving mechanism 105 of the vertical moving device 1 through the fixing hole 1051. One end of the tube array 3 is connected to the second moving mechanism 206 of the horizontal moving device. At the same time, the other end of the tube array 3 is connected to the high-pressure plunger pump 5 through the pipe joint 4 and the auxiliary pipe.

[0092] Specifically, the tube array 3 includes a spray gun tube array 301, a connecting bracket 302, a gas-mixing spray gun 303, a first thread 304, and a second thread 305. The spray gun tube array 301 is connected to the gas-mixing spray gun 303. Preferably, the spray gun tube array 301 includes multiple arms, each connected to a corresponding plurality of gas-mixing spray guns 303. The spray gun tube array 301 is connected to the connecting bracket 302. The first thread 304 is located at the end of the connecting bracket 302 and is threadedly connected to the second moving mechanism 206. When the second moving mechanism 206 moves horizontally on the horizontal moving device 2, it drives the tube array 3 to move horizontally in sync. When the horizontal moving device 2 moves on the vertical moving device 1, it drives the tube array 3 to move vertically in sync.

[0093] Specifically, the high-pressure plunger pump 5 is connected to the conveying metal hose 501. The section of the conveying metal hose 501 away from the high-pressure plunger pump 5 includes a third thread 502, which is connected to the second thread 305 via a pipe joint 4. This allows the high-pressure plunger pump 5 to provide sufficient pumping power for the air-mixing spray gun 303, giving the air-mixing spray gun 303 a strong output capacity, meeting the requirements of uniform spraying of liquid materials in the dry process of reconstituted tobacco leaves and spraying water to clean the mesh 7, while effectively preventing nozzle hole blockage.

[0094] Specifically, the delivery pressure of the high-pressure plunger pump 5 is 6.5 MPa to 10 MPa, which can be adjusted according to product characteristics and pipeline distance, and is suitable for delivering liquids with a shear viscosity of not less than 2000 mPa·s.

[0095] To sum up, the present invention provides a multifunctional device for spraying materials in the dry process of reconstituted tobacco leaves and cleaning the mesh 7, which has two working modes. In the production mode, the vertical and horizontal positions of the nozzle (spray gun) can be adjusted at will to meet the requirements of uniform liquid spraying; in the cleaning mode, the high-pressure plunger pump can meet the cleaning work of the mesh 7, and can effectively avoid the blockage of the nozzle hole.

[0096] The horizontal moving device is installed on the first moving mechanism of the vertical moving device. One end of the tube array is connected to the second moving mechanism of the horizontal moving device, and the other end of the tube array is connected to the high-pressure plunger pump through a pipe joint and an auxiliary pipe.

[0097] The horizontal moving device is installed on the first moving mechanism of the vertical moving device. As the vertical moving device operates, the horizontal device has the ability to move vertically.

[0098] One end of the tube array is connected to the second moving mechanism of the horizontal moving device. As the horizontal moving device operates, the tube array has the ability to move horizontally; the entire device has the ability to move in multiple directions horizontally and vertically to meet the usage requirements of different positions and heights.

[0099] In the production mode, the spraying effect of the mixed air spray gun is more uniform, so that the product better meets the process requirements; in the cleaning mode, the mesh blanket 7 is cleaned more cleanly and the cleaning speed is faster.

[0100] Illustratively, the dry-process reconstituted tobacco leaf production method includes the following steps: crushing and fluffing plant fibers under anhydrous conditions to form a base sheet; mixing tobacco powder with water, adhesive, smoke-generating agent, tobacco flavoring and fragrance, and humectant to form a coating liquid; spraying the coating liquid on the base sheet through the slurry spraying device for the dry process of reconstituted tobacco leaves of the present invention and drying it to form dry-process reconstituted tobacco leaves.

[0101] Exemplarily, the plant fibers include one or more of hemp pulp, bamboo pulp, and wood pulp. The plant fibers are crushed and decomposed under an anhydrous condition and then formed into a substrate by dry airflow forming, including performing a static elimination treatment on the crushed and decomposed single fibers.

[0102] For example, tobacco powder is obtained by pulverizing tobacco raw materials under anhydrous conditions. Smoking agents include glycerin, propylene glycol, and sorbitol, among others. Tobacco flavors and fragrances include burley tobacco absolute, cocoa extract, tobacco leaf extract, and oriental tobacco extract. Loading the coating liquid onto the substrate includes spraying the coating liquid onto the substrate using a non-contact spraying method.

[0103] Illustratively, the drying process includes placing the substrate carrying the coating liquid in heated air for drying. Furthermore, the drying process includes: spraying the coating liquid on the front side of the substrate while applying negative pressure to the back side of the substrate, followed by drying; and spraying the coating liquid on the back side of the substrate while applying negative pressure to the front side of the substrate, followed by drying.

[0104] For example, the production process mainly includes the steps of preparing tobacco powder, preparing coating liquid, forming substrate, coating and drying, adding smoke-generating agents and / or surface-flavoring tobacco flavors and fragrances, etc.

[0105] For example, except for the coating liquid preparation process, the entire production process basically does not require water, which greatly reduces water consumption. Moreover, the water in the coating liquid is used in the drying process, so that there is basically no discharge of solid and liquid waste in the production process, which is more environmentally friendly and is a clean and environmentally friendly production method.

[0106] For example, the tobacco powder preparation process can convert the macromolecular substances in the tobacco raw materials into small molecular substances that have a positive effect on the sensory quality of the product and are more volatile through pretreatment methods such as microorganisms and bio-enzyme treatment. Moreover, the pretreated tobacco raw materials are directly crushed and sieved and then all used in the coating liquid preparation process, thereby avoiding the loss of effective ingredients in the tobacco raw materials and improving the comprehensive utilization rate of the raw materials.

[0107] For example, the coating liquid preparation process can not only realize the basic function of effectively mixing tobacco raw materials, adhesives, smoke agents, tobacco flavors and fragrances and other auxiliary materials, but also meet the requirements of adding smoke agents, tobacco flavors and fragrances and other materials in large proportions in the heat-not-burn tobacco core materials. It only needs to fine-tune the coating liquid concentration. This can not only avoid the situation where the coating liquid is too viscous due to the large proportion of smoke agents, tobacco flavors and fragrances and other materials added under normal circumstances, affecting the coating process and causing unstable product quality, but also ensure that no obvious additional pressure is placed on the drying process. The process is adjustable, controllable and relatively flexible.

[0108] Exemplarily, the substrate forming process is a low-quantity substrate forming process that can eliminate electrostatic flocculation. It is not only suitable for the single addition of commonly used plant fibers such as wood pulp, hemp pulp, and bamboo pulp, but can also meet the simultaneous addition of multiple fiber raw materials from the aforementioned plant fibers, tobacco stems, and even special fibers such as tea stems, agarwood, agarwood leaves, and licorice fibers. The process has good adaptability.

[0109] For example, the coating and drying process can not only achieve uniform, metered, and large-proportion addition of high-viscosity and high-solid content coating liquid through an adjustable and controllable spraying process, but also through process adjustments such as reducing vehicle speed, hot air circulation penetration drying, and low-temperature drying, while ensuring sufficient drying of the product, it maximizes the retention of volatile active ingredients such as smoke agents, tobacco flavors and fragrances in the product, thereby ensuring product quality.

[0110] Illustratively, the process of adding smoke agents and / or surface flavors and fragrances is an innovative means designed to avoid the drying process while ensuring that the smoke agents, surface flavors and fragrances, etc., which have a significant impact on the quality of heat-not-burn cigarettes but are highly volatile components, are fully retained when the product has been fully dried. This again provides a guarantee for the quality of the heat-not-burn cigarette core material and its finished cigarette products.

[0111] Illustratively, smoke-generating agents and / or surface aroma tobacco flavors and fragrances, smoke-generating agents include but are not limited to glycerin, propylene glycol, sorbitol, etc., surface aroma flavors and fragrances include but are not limited to burley tobacco absolute oil, cocoa extract, tobacco leaf extract, spice tobacco extract, etc., the above materials can be added directly to the coating liquid or added externally, or they can be added to the coating liquid after being processed by technical means, including but not limited to concentration, microencapsulation, etc., to improve their stability and retention rate during production and processing.

[0112] For example, after a slight adjustment of the production process, it can meet the production of dry-process reconstituted tobacco products for filter rods and dry-process reconstituted tobacco products for heat-not-burn, and has good functional expandability.

[0113] Furthermore, the production process is a method for manufacturing heat-not-burn cigarette core materials that can be mass-produced.

[0114] Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. A slurry spraying device for a dry process of reconstituted tobacco, characterized in that: include: Storage tanks, metering pumps, self-cleaning nozzles and mesh blankets; The storage tank is suitable for accommodating the slurry of the reconstituted tobacco dry process and for containing water; The material storage tank is connected to the self-cleaning nozzle through a pipeline, and the metering pump is provided in the pipeline for pumping the material in the material storage tank to the self-cleaning nozzle; The self-cleaning nozzle is suitable for spraying the slurry of the reconstituted tobacco dry process and for spraying water; The mesh blanket is used to receive the slurry or the water in the dry process of reconstituted tobacco provided by the self-cleaning nozzle.

2. The slurry spraying device according to claim 1, characterized in that: The metering pump is suitable for spraying materials with a shear viscosity of not less than 2000 mPa·s, not less than 1600 mPa·s, not less than 1400 mPa·s or not less than 1200 mPa·s.

3. The slurry spraying device according to claim 1, characterized in that: The metering pump is a high-pressure plunger pump.

4. The slurry spraying device according to claim 3, characterized in that: The high-pressure plunger pump refers to a plunger pump with a delivery pressure of 6.5MPa to 7.5MPa, 7.5MPa to 8.5MPa or 8.5MPa to 10MPa.

5. The slurry spraying device according to claim 1, characterized in that: The self-cleaning nozzle is an air-mixing spray gun.

6. The slurry spraying device according to claim 1, characterized in that: Including not less than 2, 3 or 4 of the self-cleaning nozzles; The self-cleaning nozzles are connected in parallel.

7. The slurry spraying device according to claim 1, characterized in that: The slurry spraying device also includes a position adjustment mechanism; The position adjustment mechanism is connected to the self-cleaning nozzle and is used to adjust the relative position of the self-cleaning nozzle and the mesh blanket.

8. The slurry spraying device according to claim 7, characterized in that: The position adjustment mechanism includes a horizontal movement mechanism and a vertical movement mechanism; The vertical movement structure is used to adjust the vertical relative position of the self-cleaning nozzle and the mesh carpet; the vertical movement mechanism includes a first bearing, a first threaded shaft, a first housing, and a first connecting block. The first threaded shaft is vertically arranged in the first housing via the first bearing. The first connecting block is movably arranged on the first threaded shaft. When the first threaded shaft rotates, the first connecting block moves vertically without changing its posture. The first connecting block is connected to the first housing. The horizontal moving structure is used to adjust the horizontal relative position of the self-cleaning nozzle and the mesh blanket; the horizontal moving mechanism includes a second bearing, a second threaded shaft, a second shell and a second connecting block, the second threaded shaft is horizontally arranged in the second shell through the second bearing, the second connecting block is movably arranged on the second threaded shaft, when the second threaded shaft rotates, the second connecting block moves horizontally without changing its posture, and the second connecting block is connected to the self-cleaning nozzle.

9. The slurry spraying device according to claim 8, characterized in that: The position adjustment mechanism further includes a driving member, which is used to drive the position adjustment mechanism to adjust the relative position of the self-cleaning nozzle and the mesh; The driving member includes a first driving member and a second driving member, wherein the first driving member is used to drive and adjust the horizontal relative position of the self-cleaning nozzle and the mesh carpet, and the second driving member is used to drive and adjust the vertical relative position of the self-cleaning nozzle and the mesh carpet; At least one of the first driving member and the second driving member is a servo motor.

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