Recycling system and method for reconstituted tobacco production exits of heated cigarettes

Abstract

The invention belongs to the technical field of tobaccos, and particularly discloses a heating cigarette reconstituted tobacco production exit matter recycling system and method.According to the system, the production exit matter is divided into thick slurry exit matter and thick slurry papermaking composite exit matter, and different treatment systems including a dry method recycling system and a wet method recycling system are arranged; the device at least comprises a loosening unit, a drying unit, a metal detecting and removing unit, a crushing unit and a smashing unit which are sequentially arranged in the material flowing direction. The wet recycling system is used for treating the thick pulp papermaking composite exits and at least comprises a disintegrating unit, an impurity removal and purification unit and a solid-liquid separation unit which are sequentially arranged in the material flow direction; and slurry and a liquid material are obtained through separation of the solid-liquid separation unit. According to the method, different types of production quits are treated by adopting a dry method and a wet method respectively, so that classified resource utilization of the quits is realized, resource waste is avoided, and the effective utilization rate of raw materials is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of tobacco technology, specifically to a system and method for recycling waste materials from the production of reconstituted tobacco leaves for heated cigarettes. Background Technology

[0002] Heated cigarettes are a new type of tobacco product. They are made by heating the tobacco core material with an external heat source, causing the atomizing medium, flavor components and added flavorings in the tobacco core material to volatilize and produce smoke similar to that of traditional cigarettes. Compared with traditional cigarettes, most harmful components in heated cigarette smoke are reduced by more than 90%.

[0003] Reconstituted tobacco is the most commonly used filler material for heated cigarettes. Currently, the main production processes for reconstituted tobacco in heated cigarettes include the slurry method, the roll pressing method, the slurry papermaking method, the papermaking method, and the dry process. CN113100470A discloses a method for preparing a composite tobacco substrate. This method involves compounding tobacco sheets produced by papermaking with a slurry made from tobacco powder, plant fiber pulp, etc., and then subjecting the mixture to drying, rolling, and other processes to obtain the composite tobacco substrate. Besides tobacco sheets, paper made from wood pulp fibers, in addition to being compounded with slurry, exhibits superior physical properties such as strength and air permeability, and has attracted considerable attention in recent years. However, in the existing thick pulp paper composite method for producing reconstituted tobacco for cigarettes, the product yield is low (only about 65%), mainly due to the following three reasons: (1) During the production process, defective products are produced due to non-compliance with quality indicators such as moisture content, thickness, and basis weight; (2) When the thick pulp is composited with the paper base, the width of the thick pulp must be greater than the width of the paper base to avoid wrinkling and deformation of the paper base after composite. After drying and peeling, the excess thick pulp at the edges will fall off and cannot enter the finished product, resulting in material loss; (3) In order to ensure that the moisture content of the reconstituted tobacco meets the product usage requirements, the reconstituted tobacco is usually dried a second time after drying and peeling. However, during the second drying process, the moisture evaporation rate of the upper paper base and the bottom thick pulp is different, which causes the composite reconstituted tobacco to curl. In order to achieve smooth winding, both sides need to be cut off before winding. After winding, the reconstituted tobacco needs to be cut to a certain width. Therefore, the winding and cutting process also brings a lot of material loss. The above defective products and work-in-process that do not enter the finished product are collectively referred to as production exit materials.

[0004] Regarding the aforementioned production wastes, those skilled in the art generally hold a technical bias: due to the complex composition of viscous pulp papermaking composite wastes, containing tobacco substances, added wood pulp fibers, and potentially impurities such as hemp rope, metal, and plastic introduced during production, direct reuse is generally considered to severely impact the quality stability and sensory quality of reconstituted tobacco products. Therefore, the industry generally tends to treat these wastes simply as waste (e.g., incineration or landfill) to avoid uncontrollable impacts on the quality of mainstream products. This technical bias results in the waste of a large amount of reusable tobacco raw materials and plant fibers, making it difficult to improve the effective utilization rate of raw materials. Currently, there are no reports on the refined classification and reuse of production wastes from viscous pulp papermaking composite heated cigarette reconstituted tobacco products, particularly distinguishing different types of wastes. Summary of the Invention

[0005] This invention provides a system and method for recycling waste materials from the production of heated cigarette reconstituted tobacco. The purpose is to enable the recycling of waste materials by combining dry and wet methods according to their type, thereby avoiding resource waste and improving the effective utilization rate of raw materials.

[0006] This invention is achieved through the following technical solution: a system for recycling waste materials from the production of reconstituted tobacco leaves for heated cigarettes, comprising:

[0007] A dry recycling system, the inlet of which is used to receive and process slurry waste from production waste, the dry recycling system comprising at least a loosening unit, a drying unit, a metal detection and rejection unit, a crushing unit, and a grinding unit arranged sequentially along the material flow direction; and

[0008] A wet recycling system has an inlet for receiving and processing thick pulp paper composite waste from production waste. The wet recycling system includes at least a disintegration unit, a purification unit, and a solid-liquid separation unit arranged sequentially along the material flow direction. The solid-liquid separation unit separates pulp and liquid.

[0009] Furthermore, the dry recycling system also includes an online moisture detection unit located downstream of the drying unit. The online moisture detection unit is interlocked with the control loop of the drying unit and is used to control the moisture content of the dried material within a set range, wherein the set range of moisture content is (6±1.5)%.

[0010] Furthermore, the dry recycling system also includes a light impurity removal unit located downstream of the crushing unit, which is used to remove light impurities from the slurry exit product.

[0011] Furthermore, the loosening unit is a loosening machine, which includes a housing, a first feed inlet, a loosening roller, a conveyor belt, a first motor, a second motor, and a first discharge outlet. The loosening roller and the conveyor belt are both located inside the housing, with the loosening roller positioned above the conveyor belt. The loosening roller includes multiple vertically arranged vertical rollers and multiple horizontally arranged horizontal rollers. The horizontally arranged rollers are driven by the first motor, and the vertically arranged rollers are driven by the second motor. Multiple staggered rakes are mounted on the vertically arranged rollers and the horizontally arranged rollers.

[0012] Furthermore, the crushing unit is a crusher, which includes a frame, a third feed inlet, a roller, a screen frame, a fifth motor, a negative pressure fan, and a third discharge outlet. The roller is located inside the frame, and multiple sets of first cutters are arranged along its axial direction on the roller. Each set of first cutters has multiple cutters, and the multiple first cutters are evenly distributed along the circumference of the roller. The fifth motor is used to drive the roller to rotate. A row of second cutters is arranged on an inner sidewall of the frame, and the first cutters and multiple sets of second cutters are arranged alternately.

[0013] The screen frame is located below the roller shaft, and the air outlet of the negative pressure fan is connected to the lower space of the frame. Under the action of negative pressure, the sheared material on the screen frame leaks down from the screen holes on the screen frame and enters the third discharge port.

[0014] Furthermore, the metal detection and rejection unit includes a first vibrating groove, a metal detector, and a fourth motor. The metal detector is either an electromagnetic induction type or a microwave detection type. The metal detector is installed above the first vibrating groove, which has a debris rejection channel. The debris rejection channel has a debris rejection opening, and a movable door is installed on the debris rejection opening. The movable door is connected to a drive mechanism. The metal detector is signal-connected to the drive mechanism. When a metal debris is detected, the drive mechanism is controlled to open the movable door.

[0015] Furthermore, the pulverizing unit is a powder maker, and a first storage bin is provided between the powder maker and the light impurity removal unit; the discharge port of the powder maker is connected to a second storage bin, and both the first and second storage bins are equipped with horizontal stirring units.

[0016] Furthermore, a buffer tank and a pre-screening tank are sequentially arranged between the disintegration unit and the slag removal and purification unit, and a post-screening tank is arranged between the slag removal and purification unit and the solid-liquid separation unit; the disintegration unit includes a disintegrator for disintegrating the thick pulp papermaking composite material under a preset temperature water bath condition; the impurity removal and purification unit includes a slag remover for removing impurities; the solid-liquid separation unit is used to separate the processed material into solid fiber pulp and liquid material; the buffer tank is used to buffer the disintegrated thick pulp papermaking composite material; the pre-screening tank is used for diluting and storing the disintegrated thick pulp papermaking composite material; and the post-screening tank is used for storing the thick pulp papermaking composite material after impurity removal.

[0017] Furthermore, the wet recycling system also includes a slurry processing unit, which is located downstream of the solid-liquid separation unit and is used to dilute and homogenize the slurry separated by the solid-liquid separation unit.

[0018] A method for recycling waste products from the production of reconstituted tobacco for heated cigarettes, characterized in that the waste products are divided into slurry waste products and slurry papermaking composite waste products, and the slurry waste products and slurry papermaking composite waste products are processed using the aforementioned recycling system for waste products from the production of reconstituted tobacco for heated cigarettes.

[0019] The thick slurry is processed using a dry recycling system, including: loosening, drying, metal detection and removal, crushing and screening, and pulverizing, to obtain powdered recycled material.

[0020] The thick pulp papermaking composite waste is processed using a wet recycling system, including: disintegration under heating conditions, slag removal and purification, and solid-liquid separation, to obtain fiber pulp and liquid feed respectively;

[0021] The powdered recycled material, the fiber pulp, and / or the liquid slurry are reused in the production process of reconstituted tobacco leaves. The reuse ratios of the powdered recycled material, the fiber pulp, and the liquid slurry are as follows: by oven-dry weight, the powdered recycled material accounts for 10%-20% of the oven-dry weight of tobacco leaves, the fiber pulp accounts for 0-1.5% of the oven-dry weight of tobacco leaves, and the liquid slurry accounts for 0-5% of the oven-dry weight of tobacco leaves.

[0022] Compared with the prior art, the beneficial effects of this invention are as follows:

[0023] This invention conceives and designs a system and method for recycling waste products from the production of reconstituted tobacco leaves for heated cigarettes. Specifically, it includes two technical modes: dry recycling and wet recycling. Furthermore, it categorizes the waste products from the thick pulp papermaking composite process of heated cigarette reconstituted tobacco leaves into thick pulp waste products and thick pulp papermaking composite waste products, wherein:

[0024] (1) The thick slurry is recycled using a dry recycling technology. The thick slurry is loosened, dried, metal impurities are removed, coarsely crushed and pre-stored. It is then transported to a pulverizer with a stable moisture content and flow rate for ultra-fine pulverization. After storage, it is recycled in the thick slurry preparation process of heated cigarette reconstituted tobacco leaf thick slurry in the thick slurry papermaking composite method at an addition ratio of (10-20) wt% (compared to the oven-dry weight of tobacco powder).

[0025] (2) The wet recycling technology mode is adopted for the thick pulp papermaking composite output material. The thick pulp papermaking composite output material is mainly recycled after being crushed, pre-removed, buffered, diluted and mixed, finely removed and separated into solid and liquid materials to obtain the outer fiber pulp and thick pulp liquid. After dilution and storage, the outer fiber pulp is recycled at an addition ratio of (0-1.5) wt% (compared to the oven-dry weight of tobacco powder) in the thick pulp papermaking composite heating cigarette reconstituted tobacco plant fiber pulp preparation stage. After storage, the thick pulp liquid is used as concentration adjustment water when preparing the thick pulp papermaking composite heating cigarette reconstituted tobacco plant fiber pulp at an addition ratio of (0-5) wt% (compared to the oven-dry weight of tobacco powder).

[0026] This invention categorizes and reuses the byproducts from the production of reconstituted tobacco leaves for cigarettes using the thick pulp papermaking composite method, addressing the problem of resource waste caused by the large quantity, varying properties and compositions of byproducts and difficulties in reuse. It also avoids the issue of reduced thick pulp concentration and limited reuse ratios when using a wet-process reuse technology alone, which requires diluting the high-concentration fragmented byproducts to ensure impurity removal and purification. This invention improves the effective utilization rate of tobacco raw materials and added plant fiber raw materials. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the dry recycling system for slurry residue in an embodiment of a heated cigarette reconstituted tobacco production process according to the present invention.

[0029] Figure 2 This is a cross-sectional view of the loosening machine at section A1-A1 in an embodiment of a heated cigarette reconstituted tobacco production exit material recycling system of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of a wet recycling system for thick pulp paper composite waste in an embodiment of a heated cigarette reconstituted tobacco production waste recycling system of the present invention;

[0031] Figure 4This is a flowchart illustrating an embodiment of a method for recycling waste materials from the production of reconstituted tobacco leaves for heated cigarettes, according to the present invention.

[0032] The attached diagram shows the markings and corresponding component names:

[0033] Loosening machine 1, first feed inlet 101, first discharge outlet 102, horizontally arranged small rollers 1030, vertically arranged large rollers 1031, horizontally arranged middle rollers 1032, vertically arranged middle rollers 1033, conveyor belt 104, first motor 105, second motor 106;

[0034] Drying cylinder 2, second feed inlet 201, cylinder body 202, drum 203, steam inlet 204, third motor 205, second discharge outlet 206, steam pipeline 207, first regulating valve 208;

[0035] First vibration groove 3, debris removal port 301, fourth motor 302;

[0036] 4. Online moisture meter; 5. Metal detector;

[0037] Crusher 6, frame 600, third feed port 601, roller 602, first cutter 6021, screen frame 603, negative pressure fan 604, third discharge port 605, second cutter 606;

[0038] Second vibration groove 7;

[0039] Preliminary screen 8, fourth feed inlet 801, screen cylinder 802, pusher screw 803, sixth motor 804, fourth discharge outlet 805, first storage bin 9, material level detection device 901;

[0040] 11. Powder mill; 110. Fifth feed inlet; 111. Grinding chamber; 112. Grading chamber; 113. Seventh motor; 114. Eighth motor; 115. Fifth discharge outlet;

[0041] Second storage bin 12;

[0042] 13. Crusher, 131. Sixth feed inlet, 132. First liquid inlet, 133. Water bath jacket, 134. Crusher rotor, 135. Screen plate, 136. Sixth discharge outlet;

[0043] Buffer tank 14, seventh inlet 141, seventh outlet 142;

[0044] First screw pump 15;

[0045] Screening tank 16, eighth feed inlet 161, second liquid inlet 162, eighth discharge outlet 163;

[0046] Second screw pump 17;

[0047] Slag remover 18, ninth feed inlet 181, impurity outlet 182, ninth discharge outlet 183;

[0048] Screening tank 19, tenth inlet 191, tenth outlet 192;

[0049] Third screw pump 20;

[0050] Solid-liquid separation unit 21, eleventh inlet 211, eleventh outlet 212, liquid outlet 213;

[0051] First external fiber pulp storage tank 22, twelfth feed inlet 221, third liquid inlet 222, twelfth liquid outlet 223;

[0052] First centrifugal pump 23, second flow meter 231, second regulating valve 232;

[0053] 24. Leveling machine; 25. Second external fiber pulp storage tank; 251. Thirteenth feed inlet; 252. Thirteenth discharge outlet; 26. Second centrifugal pump;

[0054] Liquid storage tank 27, fourth liquid inlet 271, fourth liquid outlet 272, third centrifugal pump 273. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0056] As one embodiment of this application, such as Figures 1-2 As shown, this embodiment provides a system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes, including:

[0057] A dry recycling system, with its inlet for receiving and processing slurry waste from production outputs, includes at least a loosening unit, a drying unit, a metal detection and rejection unit, a crushing unit, and a grinding unit arranged sequentially along the material flow direction; and...

[0058] The wet recycling system has an inlet for receiving and processing the thick pulp paper composite waste from the production waste. The wet recycling system includes at least a disintegration unit, a purification unit and a solid-liquid separation unit 21 arranged sequentially along the material flow direction; the solid-liquid separation unit 21 separates the pulp and liquid.

[0059] In one embodiment, such as Figure 1 and Figure 2As shown, in this embodiment, the loosening unit is a loosening machine 1. The loosening machine 1 includes a housing, a first feed inlet 101, a loosening roller, a conveyor belt 104, a first motor 105, a second motor 106, and a first discharge outlet 102. The first feed inlet 101 is located at the upper part of the housing, and the first discharge outlet 102 is located at the bottom left side of the housing. The loosening roller and the conveyor belt 104 are both located inside the housing, with the loosening roller located above the conveyor belt 104. The loosening roller includes multiple vertically arranged vertical rollers and multiple horizontally arranged horizontal rollers. In this embodiment, the vertically arranged rollers include two vertically arranged large rollers 1031 and one vertically arranged medium roller 1033, and the horizontally arranged rollers include two horizontally arranged medium rollers 1032 and six horizontally arranged small rollers 1030. The two vertically arranged large rollers 1031 are located above the vertically arranged medium rollers 1033, and the three vertically arranged rollers are arranged vertically in sequence. The six horizontally arranged small rollers 1030 are arranged horizontally, and the two horizontally arranged medium rollers 1032 are respectively embedded between two groups of adjacent horizontally arranged small rollers 1030.

[0060] The horizontally arranged rollers are driven by the first motor 105, and the vertically arranged rollers are driven by the second motor 106. Multiple rakes are installed on the vertically and horizontally arranged rollers, that is, the rakes between adjacent vertically and horizontally arranged rollers are staggered to avoid interference. The rakes rotate continuously under the drive of the first motor 105 and the second motor 106, thereby peeling off the stacked thick slurry exit material layer by layer in both horizontal and vertical directions to achieve loosening. The loosened thick slurry exit material is conveyed to the first discharge port 102 by the conveyor belt 104.

[0061] In one embodiment, such as Figure 1 As shown, the drying unit in this embodiment is a drying cylinder 2, which includes a second feed inlet 201, a cylinder body 202, a drum 203, a steam inlet 204, a third motor 205, and a second discharge outlet 206. The drum 203 is located inside the cylinder body 202 and can rotate inside the cylinder body 202. The second feed inlet 201 is located at the right end of the cylinder body 202 and communicates with the drum 203. The second feed inlet 201 is located directly below the first discharge outlet 102. The second discharge outlet 206 is located at the bottom left end of the cylinder body 202 and communicates with the drum 203. The third motor 205 is used to drive the drum 203 to rotate and transport the slurry discharge material from the second feed inlet 201 to the second discharge outlet 206.

[0062] It should be noted that although the drying unit in this embodiment is described using drying cylinder 2 as an example, the drying unit is not limited to this in other embodiments of the present invention. Depending on the material characteristics, production capacity, and factory layout, those skilled in the art can reasonably select other types of drying equipment. For example, the drying unit can also use a belt dryer, which conveys materials through multiple mesh belts and is suitable for materials with good air permeability and high requirements for drying uniformity; or a fluidized bed dryer can be used, which uses hot air to suspend and fluidize the material, achieving rapid and uniform drying, suitable for granular or loose materials. The above variations are all equivalent substitutions under the concept of the present invention and can achieve the same function of controlling the moisture content of the material within a set range.

[0063] In this embodiment, the steam inlet 204 is located at the top of the cylinder 202 of the drying cylinder 2. A steam pipe 207 is connected to the steam inlet 204, and a first regulating valve 208 is provided on the steam pipe 207. Steam is introduced into the drying cylinder 2 through the steam pipe 207 for heating. The moisture content of the slurry exiting the drying cylinder 2 is interlocked with the first regulating valve 208 using a PID controller. In this embodiment, the set value of the moisture content of the slurry exiting the drying cylinder 2 is (6±1.5)%. In this embodiment, an online near-infrared moisture meter is installed at (or near) the outlet of the drying cylinder 2 to measure the instantaneous moisture content of the output material in real time and continuously, and transmits the signal to the PID controller. The controller compares the measured value (e.g., 7.5%) with the set value (6%) and calculates the deviation (+1.5%). The PID algorithm (proportional, integral, derivative) calculates the optimal control command based on the history and trend of this deviation. The controller sends the command to the first regulating valve 208 (usually a pneumatic or electric regulating valve) on the steam pipeline 207. The PID controller outputs a signal to open the first regulating valve 208, increasing the steam flow and pressure entering the drying cylinder 2, thereby increasing the temperature inside the cylinder and strengthening the drying effect. If the moisture content is too low, the PID controller outputs a signal to close the first regulating valve 208, reducing the steam supply, reducing the drying intensity, and preventing over-drying.

[0064] In one embodiment, such as Figure 1 As shown, the metal detection and rejection unit includes a first vibration groove 3, a metal detector 5, and a fourth motor 302. The metal detector 5 is either an electromagnetic induction type or a microwave detection type, and is used to detect metal impurities such as iron, stainless steel, and aluminum in the slurry discharge material.

[0065] A metal detector 5 is installed above the first vibrating trough 3. The first vibrating trough 3 is provided with a debris removal channel, and a debris removal port 301 is opened on the debris removal channel. A movable door is installed on the debris removal port 301. The movable door is connected to a drive mechanism. In this embodiment, the movable door is hinged to one side of the debris removal port 301 by a rotating shaft. A cylinder is connected to one side of the movable door. The cylinder is controlled by a solenoid valve. The solenoid valve is electrically connected to the control system of the metal detector 5. The metal detector 5 is signal-connected to the drive mechanism. When a metal debris is detected, the drive mechanism is controlled to open the movable door, thereby opening the debris removal port 301 on the debris removal channel of the first vibrating trough 3, and removing the slurry containing metal debris from the material removal and conveying system.

[0066] In this embodiment, the fourth motor 302 is a variable frequency motor, which provides a steplessly adjustable vibration source for the first vibrating trough 3, realizing stable, controllable and adjustable material conveying from the drying unit to the crushing unit. The material is moved forward in a "jumping" manner in the trough by high frequency and small amplitude mechanical vibration, and provides ideal material passage conditions for online metal detection.

[0067] In one embodiment, such as Figure 1 As shown, the dry recycling system in this embodiment also includes an online moisture detection unit located downstream of the drying unit. The online moisture detection unit is interlocked with the control loop of the drying unit and is used to control the moisture content of the dried material within a set range. The moisture content setting range is (6±1.5)%. In this embodiment, the online moisture detection unit includes an online moisture meter 4.

[0068] In one embodiment, such as Figure 1 As shown, the crushing unit is a crusher 6, which includes a frame 600, a third feed inlet 601, a roller 602, a screen frame 603, a fifth motor, a negative pressure fan 604, and a third discharge outlet 605. The roller 602 is located inside the frame 600, and multiple sets of first cutters 6021 are arranged on the roller 602 along its axial direction. Each set of first cutters 6021 has multiple cutters, and the multiple first cutters 6021 are evenly distributed along the circumference of the roller 602. The fifth motor is used to drive the roller 602 to rotate. A row of second cutters 606 is arranged on an inner side wall of the frame 600, and the first cutters 6021 and the multiple sets of second cutters 606 are arranged alternately.

[0069] The screen frame 603 is located below the roller 602. The outlet of the negative pressure fan 604 is connected to the lower space of the frame 600. Under the action of negative pressure, the sheared material on the screen frame 603 falls through the screen holes on the screen frame 603 and enters the third discharge port 605. In this embodiment, the first cutter 6021 on the roller 602 rotates continuously under the drive of the fifth motor, and intersects with the second cutter 606 on the frame 600 to shear the thick slurry discharge. The thick slurry discharge after shearing is gradually reduced to a certain size, and under the action of negative pressure fan 604, it falls through the screen holes on the screen frame 603 and enters the third discharge port 605. The size of the thick slurry discharge at the outlet of the crusher 6 is 5-8mm.

[0070] In one embodiment, such as Figure 1 As shown, the dry recycling system in this embodiment also includes a light impurity removal unit located downstream of the crushing unit. The light impurity removal unit is used to remove light impurities from the slurry discharge. In this embodiment, the light impurity removal unit is a primary screening screen 8, which includes a fourth feed inlet 801, a screen cylinder 802, a pusher screw 803, a sixth motor 804, and a fourth discharge outlet 805. The output shaft of the sixth motor 804 is coaxially connected to the screen cylinder 802. The screen cylinder 802 rotates under the drive of the sixth motor 804. The slurry discharge passes through the screen holes of the screen cylinder 802 and is conveyed to the fourth discharge outlet 805 by the pusher screw 803. Non-tobacco impurities such as hemp rope, plastic rope, and label paper are trapped inside the screen cylinder 802, thereby removing light impurities from the slurry discharge.

[0071] In one embodiment, such as Figure 1 As shown, a second vibrating trough 7 is provided between the primary screening screen 8 and the crusher 6. A vibrating motor is installed on the second vibrating trough 7 to drive it to vibrate and convey materials. The feed inlet of the second vibrating trough 7 is directly opposite to the third discharge port 605 of the crusher 6, and the discharge port of the second vibrating trough 7 is directly opposite to the fourth feed inlet 801 on the primary screening screen 8. In this way, the material after being crushed by the crusher 6 is conveyed through the second vibrating trough 7 to the fourth feed inlet 801 and enters the primary screening screen 8 for screening to remove impurities.

[0072] In one embodiment, such as Figure 1 As shown, the pulverizing unit in this embodiment is a pulverizer 11. A first storage bin 9 is provided between the pulverizer 11 and the light impurity removal unit. The first storage bin 9 is equipped with a material level detection device 901. The discharge port of the pulverizer 11 is connected to a second storage bin 12. Both the first storage bin 9 and the second storage bin 12 are equipped with a horizontal stirring unit. The horizontal stirring unit includes a motor and a stirring paddle. The stirring paddle is driven by the motor to rotate, thereby stirring the material in the storage bin to ensure that the material is uniform and to prevent the material from clumping.

[0073] In this embodiment, the pulverizer 11 includes a fifth feed inlet 110, a pulverizing chamber 111, a grading chamber 112, a seventh motor 113, an eighth motor 114, and a fifth discharge outlet 115. The seventh motor 113 is connected to the rotor in the pulverizing chamber 111 (the rotor is usually equipped with hammers, toothed rings, or pins). The seventh motor 113 drives the rotor in the pulverizing chamber 111 to rotate. The material is subjected to strong impact, collision, shearing, and friction between the high-speed rotor and the fixed toothed ring or liner, and is instantly crushed into fine particles.

[0074] The eighth motor 114 is connected to the grading wheel (a rotor with dense blades) in the grading chamber 112. The eighth motor 114 drives the grading wheel to rotate at high speed, generating a strong centrifugal force field.

[0075] Both the seventh motor 113 and the eighth motor 114 are variable frequency motors, and their frequencies can be adjusted according to the particle size of the pulverized thick slurry. In a preferred embodiment, the particle size of the pulverized thick slurry is controlled within the range of 100-350 mesh. Within this particle size range, the resulting powdered recycled material can achieve good dispersibility and compatibility when reused in the preparation of reconstituted tobacco thick slurry, avoiding the impact on product texture due to excessively coarse particles or dust loss due to excessively fine particles. In this embodiment, the frequency of the seventh motor 113 is 40-50Hz, and the frequency of the eighth motor 114 is 25-45Hz, achieving the above-mentioned particle size range. It should be noted that the above-mentioned 100-350 mesh is a preferred range derived based on the specific material characteristics of this invention. Depending on the application scenario of the recycled material (such as for thick slurry preparation or for coating liquid preparation) and the requirements for the final product texture, those skilled in the art can reasonably adjust the pulverized particle size. For example, when a finer texture is required, the fineness can be appropriately increased to above 350 mesh; when used for coating liquid preparation and where high dispersibility is required, the fineness can be appropriately reduced to below 100 mesh. Therefore, the particle size after pulverization by the powder mill of this invention can be adjusted within the range of 80-400 mesh, as long as the effective reuse of powdered recycled materials can be achieved.

[0076] In one embodiment, the material level detection device 901 of the first storage silo 9 and the third motor 205 are interlocked using PID. When the material level of the first storage silo 9 is ≤40%, the frequency of the third motor 205 is increased by 3-5Hz. When the material level of the first storage silo 9 is ≥70%, the frequency of the third motor 205 is restored to the original frequency after a delay of 5-10s, so that the material level of the first storage silo 9 is stabilized at (40-70)%, in order to deliver a stable flow of thick slurry to the pulverizer 11 and ensure the stability of the particle size of the thick slurry after pulverization.

[0077] In one embodiment, the second storage bin 12 is equipped with a weighing and metering device. The slurry residue after dry processing is stored in the second storage bin 12 and recycled in the production and processing of reconstituted tobacco leaves for heated cigarettes using the slurry papermaking composite method at an addition ratio of (10-20) wt% (compared to the oven-dry weight of tobacco powder).

[0078] In one embodiment, such as Figure 3 As shown, in this embodiment, a buffer tank 14 and a pre-screen tank 16 are arranged in sequence between the crushing unit and the slag removal and purification unit, and a post-screen tank 19 is arranged between the slag removal and purification unit and the solid-liquid separation unit 21.

[0079] The disintegration unit includes a disintegrator 13 for disintegrating the thick pulp papermaking composite material under a preset temperature water bath condition; the impurity removal and purification unit includes a slag remover 18 for removing impurities; the solid-liquid separation unit 21 is used to separate the processed material into solid fiber pulp and liquid material; the buffer tank 14 is used to buffer the thick pulp papermaking composite material after disintegration; the pre-screening tank 16 is used for diluting and storing the thick pulp papermaking composite material after disintegration; and the post-screening tank 19 is used for storing the thick pulp papermaking composite material after impurity removal.

[0080] In one embodiment, such as Figure 3 As shown, the crusher 13 in this embodiment includes a sixth feed inlet 131, a first liquid inlet 132, a shell, a water bath jacket 133, a crushing rotor 134, a sieve plate 135, a ninth motor, and a sixth discharge outlet 136. The first liquid inlet 132 and the sixth feed inlet 131 are both located at the top of the shell, and the sixth discharge outlet 136 is located at the bottom of the shell. The water bath jacket 133 is located on the outside of the shell, and a hot water inlet is provided on the water bath jacket 133. Hot water continuously circulates through the water bath jacket 133 from the hot water inlet to keep the material inside the shell warm.

[0081] The material concentration in the disintegrator 13 is (20-30) wt%, and the water bath temperature of the water bath jacket 133 is 35-50℃. The water bath jacket 133 keeps the material temperature in the disintegrator 13 stable. Within this temperature range, the thick pulp paper composite material can achieve the best heat softening effect in the disintegrator 13, making it easier to separate the thick pulp from the paper base. The separated paper base is also easier to absorb water, swell, and dissociate. At the same time, it avoids damage to the tobacco aroma components caused by excessive temperature.

[0082] It should be noted that the aforementioned 35-50℃ is a preferred range derived based on the specific material characteristics of this invention. Depending on the specific composition and softening characteristics of the extruded material, those skilled in the art can reasonably adjust the water bath temperature. For example, when the extruded material has a high paper base content and coarse, stiff fibers, the temperature can be appropriately increased to 50-55℃ to promote softening; when the extruded material is mainly composed of viscous pulp and there are concerns about the loss of aroma components, the temperature can be appropriately decreased to 30-35℃. Therefore, the water bath temperature of the disintegration unit of this invention can be adjusted within the range of 30-55℃, as long as effective separation of the viscous pulp and paper base can be achieved.

[0083] The sieve plate 135 is located at the bottom of the shell, and the aperture of the sieve plate 135 is 5-8mm. It intercepts the incompletely crushed exit material and non-tobacco impurities such as hemp rope, metal, and plastic with larger dimensions, and prevents them from flowing into the next process.

[0084] In one embodiment, such as Figure 3 As shown, in this embodiment, the buffer tank 14 includes a seventh inlet 141 and a seventh outlet 142. The seventh inlet 141 and the seventh outlet 142 are located at the top and bottom of the buffer tank 14, respectively. The buffer tank 14 is used to buffer the pulp papermaking composite material after disintegration. In this embodiment, a first screw pump 15 is provided below the seventh outlet 142 of the buffer tank 14 to transport the disintegrated pulp papermaking composite material to the next process.

[0085] In one embodiment, such as Figure 3 As shown, the pre-screening tank 16 includes an eighth feed inlet 161, a second liquid inlet 162, and an eighth discharge outlet 163. The eighth feed inlet 161 and the second liquid inlet 162 are both located at the top of the pre-screening tank 16, and the eighth discharge outlet 163 is located at the bottom of the pre-screening tank 16. The material enters the pre-screening tank 16 from the eighth feed inlet 161. The second liquid inlet 162 is used to introduce clean water into the pre-screening tank 16 to dilute the material. In this embodiment, the pre-screening tank 16 is used for the dilution and storage of the papermaking composite material after disintegration, providing material of suitable concentration for subsequent impurity removal and screening processes.

[0086] In this embodiment, a second screw pump 17 is provided between the pre-screen tank 16 and the slag removal and purification unit. The diluted material in the pre-screen tank 16 enters the second screw pump 17 through the eighth discharge port 163, and the material is transported to the slag removal and purification unit by the second screw pump 17.

[0087] In one embodiment, such as Figure 3As shown, in this embodiment, the slag remover 18 in the slag removal and purification unit includes a ninth feed inlet 181, an impurity outlet 182 and a ninth discharge outlet 183. The slag remover 18 is used to remove small sand particles, metals and other impurities with dimensions close to or even smaller than fibers from the pulverized papermaking composite material, so as to avoid non-tobacco substances in the material being transported to the next process and having an adverse effect on product quality and equipment.

[0088] In this embodiment, the ninth feed inlet 181 is located on the upper left side of the slag remover 18, the ninth discharge outlet 183 is located at the top of the slag remover 18, and the impurity outlet 182 is located at the bottom of the slag remover 18.

[0089] In one embodiment, such as Figure 3 As shown, the screening tank 19 in this embodiment includes a tenth inlet 191 and a tenth outlet 192. The tenth inlet 191 is located at the top of the screening tank 19, and the tenth outlet 192 is located at the bottom of the screening tank 19. A third screw pump 20 is also provided below the screening tank 19. The tenth outlet 192 is directly opposite to the inlet of the third screw pump 20. The third screw pump 20 transports the material in the screening tank 19 to the downstream solid-liquid separation unit 21.

[0090] In one embodiment, such as Figure 3 As shown, the solid-liquid separation unit 21 includes an eleventh feed inlet 211, an eleventh discharge outlet 212, and a liquid outlet 213. The eleventh feed inlet 211 is located at the top of the solid-liquid separation unit 21, and the eleventh discharge outlet 212 and the liquid outlet 213 are both located at the bottom of the solid-liquid separation unit 21. The solid-liquid separation unit 21 can be any one of a horizontal screw centrifuge, a single screw extruder, or a double screw extruder.

[0091] Furthermore, although the solid-liquid separation unit 21 in this embodiment exemplifies forms such as a horizontal screw centrifuge and a spiral dewatering machine, in actual production, the selection of solid-liquid separation equipment needs to comprehensively consider the material concentration, throughput, required dryness of the separated material, and the factory's utility conditions. Therefore, in other embodiments of the present invention, the solid-liquid separation unit 21 can also be a plate and frame filter press, suitable for scenarios requiring high filtrate clarity and intermittent operation; or a belt filter press, suitable for large throughput and continuous operation, achieving separation of fiber slurry and liquid through the combination of gravity dewatering zone and extrusion dewatering zone. Any equipment capable of separating the processed material into solid fiber slurry and liquid can be used as an equivalent replacement for the solid-liquid separation unit of the present invention. In one embodiment, such as Figure 3 As shown, the wet recycling system in this embodiment also includes a slurry processing unit, which is located downstream of the solid-liquid separation unit 21 and is used to dilute and homogenize the slurry separated by the solid-liquid separation unit 21.

[0092] The pulp processing unit includes a first external fiber pulp storage tank 22, a liquid storage tank 27, a homogenizer 24, and a second external fiber pulp storage tank 25.

[0093] In this embodiment, the first external fiber pulp storage tank 22 and the liquid storage tank 27 are located below the solid-liquid separation unit 21. The external fiber pulp recovered after solid-liquid separation is stored in the first external fiber pulp storage tank 22 through the eleventh discharge port 212, and the liquid is stored in the liquid storage tank 27 through the liquid outlet 213.

[0094] In this embodiment, the first external fiber pulp storage tank 22 includes a twelfth feed inlet 221, a third liquid inlet 222, and a twelfth liquid outlet 223. The third liquid inlet 222 and the twelfth feed inlet 221 are both located at the top of the first external fiber pulp storage tank 22. The twelfth feed inlet 221 is connected to the eleventh discharge outlet 212. The third liquid inlet 222 is used to introduce clean water into the first external fiber pulp storage tank 22, thereby diluting the material entering the first external fiber pulp storage tank 22.

[0095] The first external fiber pulp storage tank 22 is used for the dilution and storage of external fiber pulp. The outlet pipe of the first external fiber pulp storage tank 22 is equipped with a first centrifugal pump 23, and the outlet pipe of the first centrifugal pump 23 is equipped with a second flow meter 231 and a second regulating valve 232. After dilution, the external fiber pulp is transported to the leveling machine 24 by the first centrifugal pump 23 to further dissolve the lumpy and blocky external fiber pulp that has not been fully disintegrated. In this embodiment, the pulp is pumped into the leveling machine 24, and a gentle but high-frequency shearing force, kneading force and friction force are applied to the fiber bundle through a precision grinding zone or rotor-stator system. After leveling, the fiber morphology is optimized, and it can form a more uniform and stronger network structure with other components in the subsequent pulping process, thereby significantly improving the physical strength and uniformity of the final reconstituted tobacco leaf.

[0096] The top of the second external fiber pulp storage tank 25 is provided with a thirteenth feed port 251, and the bottom side of the second external fiber pulp storage tank 25 is provided with a thirteenth discharge port 252. A second centrifugal pump 26 is provided on the outlet pipe of the second external fiber pulp storage tank 25. The external fiber pulp after being homogenized by the homogenizer 24 is stored in the second external fiber pulp storage tank 25 and then transported back to the thick pulp papermaking composite method for the production and processing of reconstituted tobacco leaves for cigarettes. The external fiber pulp recycling ratio is (0-1.5)wt% (compared to the oven-dry weight of tobacco powder).

[0097] In this embodiment, the liquid storage tank 27 includes a fourth inlet 271 and a fourth outlet 272. The fourth inlet 271 is located at the top of the liquid storage tank 27 and is connected to the outlet 213. The fourth outlet 272 is located at the bottom of the liquid storage tank 27. The liquid storage tank 27 is used to store the recovered thick slurry liquid. A third centrifugal pump 273 is provided on the outlet pipe of the liquid storage tank 27. A third flow meter and a third regulating valve (not shown in the figure) are provided on the outlet pipe of the third centrifugal pump 273. The thick slurry liquid recovered after wet processing is recycled in the thick slurry papermaking composite heating cigarette reconstituted tobacco leaf production process at an addition ratio of (0-5) wt% (compared to the oven-dry weight of tobacco powder).

[0098] In one embodiment, the buffer tank 14, the pre-screen tank 16, the post-screen tank 19, and the liquid storage tank 27 are all equipped with a vertical stirring device. The vertical stirring device includes a motor and a stirring paddle. The motor drives the stirring paddle to rotate, thereby stirring the material inside the tank.

[0099] In another embodiment, such as Figure 4 As shown, this embodiment discloses a method for recycling the waste products from the production of reconstituted tobacco leaves for heated cigarettes. The waste products are divided into slurry waste products and slurry papermaking composite waste products. The slurry waste products and slurry papermaking composite waste products are processed using a waste product recycling system for reconstituted tobacco leaves for heated cigarettes as described in the above embodiment.

[0100] For the thick slurry output, a dry recycling system is used for processing, including: loosening, drying, metal detection and removal, crushing and screening, and pulverizing to obtain powdered recycled material;

[0101] For the thick pulp paper composite waste, a wet recycling system is used for treatment, including: disintegration under heating conditions, slag removal and purification and solid-liquid separation, to obtain fiber pulp and liquid feed respectively;

[0102] The powdered recycled material, the fiber pulp and / or the liquid slurry are reused in the production process of reconstituted tobacco leaves. The reuse ratios of the powdered recycled material, fiber pulp and liquid slurry are as follows: by oven-dry weight, the powdered recycled material accounts for 10%-20% of the oven-dry weight of tobacco leaves, the fiber pulp accounts for 0-1.5% of the oven-dry weight of tobacco leaves, and the liquid slurry accounts for 0-5% of the oven-dry weight of tobacco leaves.

[0103] Specifically:

[0104] The dry recycling method specifically includes the following steps:

[0105] S11, during the production of reconstituted tobacco leaves for heated cigarettes, the thick slurry is collected and packaged.

[0106] After the thick slurry ejected from S12 and S11 is unpacked, it is loosened by the loosening unit. Specifically, after the thick slurry ejected from S11 is unpacked, it enters the loosening machine 1 through the first feed port 101. Under the action of the palladium nails of the loosening roller, it peels off layer by layer to achieve loosening.

[0107] S13, the thick slurry exit material after being loosened by the loosening unit enters the drying unit for drying. Specifically, the thick slurry exit material after being processed by the loosening machine 1 is conveyed by the conveyor belt 104 and enters the drying cylinder 2 through the second feed port 201 for drying. As the drum 203 of the drying cylinder 2 rotates continuously, the thick slurry exit material is conveyed from the second feed port 201 to the second discharge port 206.

[0108] S14. The slurry exit material after being processed by the drying unit is inspected by the metal detection and rejection unit, and metal impurities in the slurry exit material are removed. Specifically, the slurry exit material after being dried by the drying cylinder 2 is conveyed by the first vibrating trough 3 and passes under the online moisture meter 4 and the metal detector 5 in sequence. The moisture content of the slurry exit material is detected online in real time, and metal impurities such as iron, stainless steel, and aluminum in the slurry exit material are removed.

[0109] The slurry exit material in S15 and S14 enters the crushing unit for coarse crushing. Specifically, the slurry papermaking composite exit material in S14 is conveyed by the first vibrating trough 3 and enters the crusher 6 through the third feed port 601. Under the radial and axial multiple shearing actions of the first cutter 6021 on the roller 602 and the second cutter 606 on the frame 600, coarse crushing is achieved.

[0110] S16, the thick slurry exit material after coarse crushing enters the light impurity removal unit to remove light impurities in the thick slurry exit material. Specifically, the thick slurry exit material after coarse crushing is conveyed by the second vibrating trough 7 and enters the primary screening screen 8 through the fourth feed port 801 to remove non-tobacco light impurities such as hemp rope, plastic rope, and label paper from the thick slurry exit material.

[0111] In S17 and S16, the thick slurry exit material enters the crushing unit to achieve ultra-fine crushing treatment. Specifically, after the thick slurry exit material in S16 is stored in the first storage bin 9, the material in the first storage bin 9 is transported by a screw conveyor and enters the powder mill 11 through the fifth feed port 110. Then, it passes through the crushing chamber 111 and the classification zone for ultra-fine crushing treatment.

[0112] S18. The slurry residue after ultrafine grinding is stored for later use. Specifically, the slurry residue after ultrafine grinding is stored in the second storage bin 12 for reuse in the production and processing of reconstituted tobacco leaves for heated cigarettes using the slurry papermaking composite method.

[0113] The wet recycling method specifically includes the following steps:

[0114] S21: In the process of producing reconstituted tobacco leaves for heated cigarettes, the thick pulp paper composite material is collected and boxed.

[0115] S22: After the thick pulp papermaking composite material in S21 is unpacked, it enters the shredder 13 through the sixth feed port 131. Hot water at 35-50℃ is added from the first liquid inlet 132. After the thick pulp papermaking composite material is mixed with the hot water, it is shredded for 30-60 minutes under the shearing force of the shredder rotor 134 and the mutual friction between the material itself. The shredded thick pulp papermaking composite material is discharged from the sixth discharge port 136 through the holes on the sieve plate 135 and enters the buffer tank 14 through the seventh feed port 141.

[0116] S23: After being crushed, the thick pulp papermaking composite product is stored in the buffer tank 14 for 20-50 minutes. Then, under the delivery of the first screw pump 15, it enters the pre-screen tank 16 through the eighth feed port 161. Room temperature water is added from the second liquid inlet 162 to dilute the thick pulp papermaking composite product in the pre-screen tank 16 and mix it evenly. The concentration of the thick pulp papermaking composite product after dilution is (4±1)%.

[0117] S24: The diluted slurry papermaking composite discharge material in S23 is transported by the second screw pump 17 and enters the slag remover 18 through the ninth feed port 181 for purification treatment. Small sand particles, metal and other impurities with a size close to or even smaller than the fiber are removed from the discharge material. Then it is discharged through the ninth discharge port 183 and enters the screen tank 19 through the tenth feed port 191.

[0118] S25: The thick pulp papermaking composite material exiting from the screening tank 19 is conveyed by the third screw pump 20 and enters the solid-liquid separation unit 21 through the eleventh feed port 211. The outer fiber pulp recovered after solid-liquid separation is discharged from the eleventh discharge port 212 and stored in the first outer fiber pulp storage tank 22, while the liquid is discharged from the liquid outlet 213 and stored in the liquid storage tank 27. Room temperature clean water is added from the third liquid inlet 222 to dilute the outer fiber pulp in the first outer fiber pulp storage tank 22 and mix evenly. The dryness of the outer fiber pulp after solid-liquid separation is (25-35)%, the concentration of the diluted outer fiber pulp is (3.0-3.5)wt%, and the solid content of the liquid is (2.5-4.5)%.

[0119] S26: The diluted external fiber pulp in the first external fiber pulp storage tank 22 in S25 is transported into the homogenizer 24 by the first centrifugal pump 23. After further descaling treatment by the homogenizer 24, it is stored in the second external fiber pulp storage tank 25.

[0120] S27: External fiber pulp and liquid material are to be recycled in the production and processing of reconstituted tobacco leaves for thick pulp papermaking composite heating cigarettes.

[0121] Those skilled in the art will understand that the specific equipment forms used in each unit of the present invention are not unique or fixed. In addition to the forms such as loosening machines, crushers, pulverizers, disintegrators, and slag removers specifically described in the foregoing embodiments, any equivalent equipment that can achieve the same function can be used as a substitute.

[0122] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for recycling waste materials from the production of reconstituted tobacco leaves for heated cigarettes, characterized in that, include: A dry recycling system, the inlet of which is used to receive and process slurry waste from production waste, the dry recycling system comprising at least a loosening unit, a drying unit, a metal detection and rejection unit, a crushing unit, and a grinding unit arranged sequentially along the material flow direction; and A wet recycling system has an inlet for receiving and processing thick pulp paper composite waste from production waste. The wet recycling system includes at least a disintegration unit, a purification unit, and a solid-liquid separation unit arranged sequentially along the material flow direction. The solid-liquid separation unit separates pulp and liquid.

2. The system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, The dry recycling system also includes an online moisture detection unit located downstream of the drying unit. The online moisture detection unit is interlocked with the control loop of the drying unit and is used to control the moisture content of the dried material within a set range, which is (6±1.5)%.

3. The system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, The dry recycling system also includes a light impurity removal unit located downstream of the crushing unit, which is used to remove light impurities from the slurry discharge.

4. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to any one of claims 1-3, characterized in that, The loosening unit is a loosening machine, which includes a housing, a first feed inlet, a loosening roller, a conveyor belt, a first motor, a second motor, and a first discharge outlet. The loosening roller and the conveyor belt are both located inside the housing, with the loosening roller positioned above the conveyor belt. The loosening roller includes multiple vertically arranged vertical rollers and multiple horizontally arranged horizontal rollers. The horizontally arranged rollers are driven by the first motor, and the vertically arranged rollers are driven by the second motor. Multiple staggered rakes are mounted on the vertically arranged rollers and the horizontally arranged rollers.

5. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, The crushing unit is a crusher, which includes a frame, a third feed inlet, a roller, a screen frame, a fifth motor, a negative pressure fan, and a third discharge outlet. The roller is located inside the frame, and multiple sets of first cutters are arranged along its axial direction on the roller. Each set of first cutters has multiple cutters, and the multiple first cutters are evenly distributed along the circumference of the roller. The fifth motor is used to drive the roller to rotate. A row of second cutters is arranged on an inner side wall of the frame, and the first cutters and multiple sets of second cutters are arranged alternately. The screen frame is located below the roller shaft, and the air outlet of the negative pressure fan is connected to the lower space of the frame. Under the action of negative pressure, the sheared material on the screen frame leaks down from the screen holes on the screen frame and enters the third discharge port.

6. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, The metal detection and rejection unit includes a first vibrating groove, a metal detector, and a fourth motor. The metal detector is either an electromagnetic induction type or a microwave detection type. The metal detector is installed above the first vibrating groove, which has a debris rejection channel. The debris rejection channel has a debris rejection opening, and a movable door is installed on the debris rejection opening. The movable door is connected to a drive mechanism. The metal detector is signal-connected to the drive mechanism. When a metal debris is detected, the drive mechanism is controlled to open the movable door.

7. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 3, characterized in that, The pulverizing unit is a powder maker, and a first storage bin is provided between the powder maker and the light impurity removal unit; the discharge port of the powder maker is connected to a second storage bin, and both the first and second storage bins are equipped with horizontal stirring units.

8. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, A buffer tank and a pre-screening tank are sequentially arranged between the pulping unit and the slag removal and purification unit, and a post-screening tank is arranged between the slag removal and purification unit and the solid-liquid separation unit. The pulping unit includes a pulper for pulping the thick pulp papermaking composite product under a preset temperature water bath condition. The impurity removal and purification unit includes a slag remover for removing impurities. The solid-liquid separation unit is used to separate the processed material into solid fiber pulp and liquid material. The buffer tank is used to buffer the pulped thick pulp papermaking composite product. The pre-screening tank is used for diluting and storing the pulped thick pulp papermaking composite product. The post-screening tank is used for storing the thick pulp papermaking composite product after impurity removal.

9. A system for recycling waste materials from the production of reconstituted tobacco for heated cigarettes according to claim 1, characterized in that, The wet recycling system also includes a slurry treatment unit, which is located downstream of the solid-liquid separation unit and is used to dilute and homogenize the slurry separated by the solid-liquid separation unit.

10. A method for recycling waste materials from the production of reconstituted tobacco leaves for heated cigarettes, characterized in that, The production waste is divided into thick pulp waste and thick pulp papermaking composite waste, and the thick pulp waste and thick pulp papermaking composite waste are processed using a heating cigarette reconstituted tobacco production waste recycling system as described in any one of claims 1-9; The thick slurry is processed using a dry recycling system, including: loosening, drying, metal detection and removal, crushing and screening, and pulverizing, to obtain powdered recycled material. The thick pulp papermaking composite waste is processed using a wet recycling system, including: disintegration under heating conditions, slag removal and purification, and solid-liquid separation to obtain fiber pulp and liquid feed, respectively. The powdered recycled material, the fiber pulp, and / or the liquid slurry are reused in the production process of reconstituted tobacco leaves. The reuse ratios of the powdered recycled material, the fiber pulp, and the liquid slurry are as follows: by oven-dry weight, the powdered recycled material accounts for 10%-20% of the oven-dry weight of tobacco leaves, the fiber pulp accounts for 0-1.5% of the oven-dry weight of tobacco leaves, and the liquid slurry accounts for 0-5% of the oven-dry weight of tobacco leaves.

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