Method and system for closed-loop recycling of plant fiber degradable tableware production waste

Abstract

The application discloses a kind of plant fiber degradable tableware production waste closed loop reuse processing method and system.The processing method includes: the primary crushing treatment is carried out to plant fiber tableware production waste;Crushed waste is scanned on-line using intelligent visual sorting system, identify and reject non-fiber foreign matter and coating waste, obtain pure fiber waste;Pure fiber waste is defibrated and fiber activated, and regenerated fiber slurry is obtained;The fiber quality parameters of regenerated fiber slurry are detected in real time, and the proportion of back mixing is calculated by intelligent control algorithm combined with virgin pulp parameters;According to the proportion of back mixing, regenerated fiber slurry is dynamically conveyed and mixed with virgin pulp for tableware production.The application also provides a corresponding processing system.The application can realize high-purity sorting of waste and efficient recovery of fiber properties, significantly reduce raw material cost under the premise of ensuring product quality, greatly improve the efficiency of waste reuse.

Description

Technical Field

[0001] This application relates to the technical field of environmentally friendly tableware manufacturing and solid waste resource utilization, and in particular to a closed-loop recycling method and system for processing plant fiber biodegradable tableware production waste. Background Technology

[0002] Degradable plant fiber tableware is gaining increasing market demand as an environmentally friendly alternative. However, the production process generates a significant amount of waste, typically accounting for 15% to 30% of total output, during the molding, trimming, and quality inspection stages. Currently, the main methods for treating this waste include direct landfilling, incineration, or simple crushing and recycling. Landfilling and incineration result in resource waste and environmental pollution.

[0003] The existing simple crushing and recycling methods have the following problems: On the one hand, waste materials often contain non-fibrous foreign objects such as metal and plastic, as well as waterproof and oil-proof coatings on the surface. If these are not removed and recycled directly, they will clog the forming net, damage the equipment, and cause quality problems such as black spots and reduced strength in the finished product. On the other hand, plant fibers will undergo "keratinization" after drying, which will cause the fibers to harden, reduce their swelling capacity and binding force. Without special activation treatment, only a very low recycling rate can be maintained, usually less than 10%. Moreover, the recycling process relies heavily on manual experience or fixed proportions of pulp mixing, and cannot be adjusted according to the actual quality fluctuations of the waste fibers, resulting in unstable product quality and difficulty in achieving a high-proportion closed-loop recycling. Summary of the Invention

[0004] This application provides a closed-loop recycling method and system for processing plant fiber biodegradable tableware production waste, in order to solve the problems of low waste recycling efficiency and inability to achieve a high proportion of closed-loop recycling in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a closed-loop recycling method for processing plant fiber biodegradable tableware production waste. The processing method includes: S1: Collect the waste generated during the production of plant fiber tableware, and perform primary crushing treatment on the waste to obtain crushed waste; S2: The crushed waste is scanned online to identify and remove waste containing non-fiber foreign matter and waste with coating on the surface, so as to obtain pure fiber waste; S3: The pure fiber waste is subjected to decomposition and fiber activation treatment to obtain recycled fiber pulp; S4: Real-time detection of fiber quality parameters of the recycled fiber pulp, comparison and analysis of the fiber quality parameters with those of the virgin pulp, and calculation of the re-blending ratio of the recycled fiber pulp; S5: Based on the calculated remixing ratio, the recycled fiber pulp is dynamically transported to the virgin pulp mixing system for mixing to form a mixed pulp, which is then used for the subsequent molding and production of tableware.

[0006] In some embodiments, step S3, the process of decomposing and activating the pure fiber waste, includes: placing the pure fiber waste in a decomposition device for decomposition to separate the fibers; adding a biological enzyme preparation or a fiber modifier to the decomposed slurry; and conducting a constant-temperature reaction under set temperature and pH conditions to cut off some of the chromophores in the fibers and increase the surface activity of the fibers.

[0007] In some embodiments, the bio-enzyme preparation comprises a mixture of lignin-modifying enzymes and cellulases; the amount of the mixed enzyme added is 0.05% to 0.5% of the oven-dry slurry weight, the isothermal reaction time is 30 to 90 minutes, and the reaction temperature is 40 to 60°C.

[0008] In some embodiments, the fiber modifier includes cationic starch, chitosan, or a bio-based reinforcing agent; the fiber modifier is used to improve the retention rate and filtration performance of regenerated fibers, so that the filtration performance of the regenerated fiber slurry deviates from that of the virgin slurry by within ±5%.

[0009] In some embodiments, step S3, after the delamination and fiber activation treatment, further includes: performing multi-stage screening on the treated regenerated fiber pulp to remove residual fine fiber bundles and impurities; and performing fine grinding on the screened pulp to control the beating degree of the regenerated fiber pulp within a preset range.

[0010] In some embodiments, in step S4, the fiber quality parameters include at least one of the following: average fiber length, fiber thickness, filtration time, and whiteness value.

[0011] In some embodiments, in step S4, the fiber quality parameter includes the average fiber length. The step of comparing and analyzing the fiber quality parameters of the recycled fiber pulp with those of the virgin pulp, and calculating the remixing ratio of the recycled fiber pulp, includes: obtaining the physical strength standard of the target tableware to be produced; determining the minimum allowable average fiber length threshold of the recycled fiber pulp based on the physical strength standard and the average fiber length of the virgin pulp; comparing the average fiber length of the recycled fiber pulp with the minimum average fiber length threshold; if the average fiber length of the recycled fiber pulp is greater than or equal to the minimum average fiber length threshold, then the target remixing ratio is calculated as a preset benchmark value; if the average fiber length of the recycled fiber pulp is less than the minimum average fiber length threshold, then the target remixing ratio is calculated as a correction value lower than the preset benchmark value, or the preset benchmark value is maintained and the amount of reinforcing agent added is calculated as compensation.

[0012] In some embodiments, the coated waste from biodegradable tableware removed in step S2 is transported to a biodegradation treatment unit; the biodegradation treatment unit uses specific microbial communities to degrade and peel off the biodegradable coating on the surface of the waste, and the peeled substrate fibers are returned to step S1 for recycling.

[0013] In some embodiments, in step S2, the rejected non-fibrous foreign matter is further recycled by gravity separation or magnetic separation devices.

[0014] The beneficial effects of this application are as follows: Unlike existing technologies, this application discloses a closed-loop recycling method and system for plant fiber biodegradable tableware production waste. The embodiments of this application introduce an intelligent visual sorting system, utilizing hyperspectral imaging technology to accurately identify and remove non-fiber foreign objects and coating areas from the waste, solving the problems of product quality degradation and equipment failure caused by impurities in traditional recycling processes. By subjecting the removed pure fiber waste to specific de-keratinization and activation treatments, the keratinization damage of the waste fibers is effectively repaired, restoring the fiber's flexibility and binding force, significantly improving the quality of the recycled pulp, making high-proportion recycling possible. Furthermore, by online detection of fiber quality parameters and combined with intelligent control algorithms to dynamically calculate and adjust the recycling ratio, refined management and closed-loop control of the recycling process are achieved, ensuring the stability of the final mixed pulp. This maximizes the utilization of waste resources while ensuring that the physical strength of the finished tableware meets standards, significantly reducing production costs and achieving zero solid waste emissions from the production line. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic flowchart of an embodiment of the closed-loop recycling method for processing plant fiber biodegradable tableware production waste provided in this application; Figure 2 yes Figure 1 A flowchart illustrating an embodiment of step S3 in the method shown; Figure 3 This is a schematic diagram of an embodiment of the closed-loop recycling and processing system for plant fiber biodegradable tableware production waste provided in this application. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0018] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0019] In response to the problems of impurity removal, poor fiber performance recovery, low recycling rate and lack of intelligent control in the recycling of plant fiber biodegradable tableware production waste in the existing technology, this application provides a waste resource utilization solution that integrates intelligent sorting, directional activation and intelligent pulping closed-loop control.

[0020] Specifically, this application provides a closed-loop recycling method for waste materials from the production of biodegradable tableware made from plant fibers. (See reference...) Figure 1 , Figure 1 This is a schematic flow chart of an embodiment of the closed-loop recycling method for processing plant fiber biodegradable tableware production waste provided in this application. The processing method includes: Step S1: Collect the waste generated during the production of plant fiber tableware and perform primary crushing treatment on the waste to obtain crushed waste.

[0021] This step aims to perform preliminary treatment on various forms of waste generated on the production line, bringing them to a physical form suitable for subsequent sorting and pulping.

[0022] Specifically, the waste generated during the production of plant fiber tableware comes from a wide range of sources, mainly including dry-end waste, such as scraps from hot-pressing and trimming, whole pieces of tableware rejected by quality inspection due to appearance defects, and defective products caused by equipment malfunctions. These wastes come in various shapes; some are whole bowls or plates, some are long strips of edge, and some are even broken fragments. If directly sorted or pulped, large pieces of waste will clog the conveying pipes, and the internal coating will be difficult to identify or treat.

[0023] Therefore, primary crushing is necessary. In this embodiment, in step S1, a twin-shaft shredder is used for primary crushing, controlling the particle size of the crushed waste to be 10-30mm. The twin-shaft shredder shears and tears materials through two sets of relatively rotating cutter shafts, and features high crushing force and suitability for processing materials of various shapes and toughnesses.

[0024] Controlling the particle size of the crushed waste within the specific range of 10-30mm is based on the following considerations: On the one hand, if the particle size is too large, such as >30mm, large pieces of waste are prone to stacking on the subsequent conveyor belt, making it impossible for the lower layer of waste to be effectively scanned by the intelligent vision system, resulting in missed detections. At the same time, the coating inside the large pieces of waste may be encased, making it difficult to be thoroughly identified or for subsequent activating agents to penetrate. On the other hand, if the particle size is too small, such as <10mm, although the specific surface area is increased, too many powdery fine fibers will be generated during the crushing process. These fine fibers are called anionic waste in the papermaking process, which will seriously adsorb the additives, leading to a decrease in the efficacy of the additives. In addition, the small fragments are easily affected by airflow interference during subsequent airflow sorting, affecting the rejection accuracy.

[0025] By controlling the particle size to 10~30mm, it is ensured that the waste particles can form a single layer or thin layer on the conveyor belt, which is conducive to full coverage scanning of hyperspectral imaging. It also ensures that the particles have sufficient mass and inertia, which makes it easy for the airflow nozzles to accurately remove impurities.

[0026] In addition, during the crushing process, a magnetic separator can be installed at the shredder feed inlet to pre-absorb and remove large pieces of ferromagnetic metal, thereby protecting the subsequent shredder blades and precision visual inspection equipment.

[0027] Step S2: Scan the crushed waste online to identify and remove waste containing non-fiber foreign objects and waste with coatings on the surface, and obtain pure fiber waste.

[0028] The purpose of this step is to extract relatively pure plant fiber waste from the mixed waste and separate out the harmful components that affect the quality of subsequent pulping.

[0029] The intelligent vision sorting system can be used to scan crushed waste online. The intelligent vision sorting system includes a hyperspectral imaging module, an image processing unit, a conveyor belt, and a high-pressure airflow nozzle.

[0030] First, the waste material, after being crushed in step S1, is evenly spread onto a high-speed conveyor belt via a vibrating feeder. The conveyor belt typically uses a black or dark background to enhance the contrast with the light-colored plant fiber waste. As the waste material passes beneath the hyperspectral imaging module, the module performs an online scan. Unlike traditional RGB color cameras, which can only acquire intensity information in the red, green, and blue bands, hyperspectral imaging technology can acquire spectral information in hundreds of consecutive bands, forming a spectral fingerprint for each pixel.

[0031] For the identification of non-fibrous foreign objects: the spectral reflectance of materials such as plastics, rubber, and metals differs significantly from that of plant fibers in specific near-infrared bands; for example, plant fibers have strong moisture absorption peaks near 1450nm and 1940nm, while plastics exhibit different characteristics in these bands; the image processing unit has a built-in database of spectral features of various materials, and by comparing the real-time acquired spectral data with the database using algorithm analysis, non-fibrous foreign objects such as mixed plastic fragments and metal particles can be accurately identified.

[0032] For the identification of waste materials with coatings on the surface: In order to achieve waterproof and oil-proof effects, plant fiber tableware is usually coated with coatings such as polylactic acid (PLA), polybutylene terephthalate (PBAT), or fluorinated acrylic resin. The spectral characteristics of these polymer coatings are quite different from those of the plant fiber substrate; in particular, PLA coatings have unique characteristic peaks in specific short-wave infrared bands; by setting specific band thresholds, the image processing unit can generate a coating distribution map to mark the waste material areas covered with coatings.

[0033] After identification, the image processing unit sends the identification results to the control system. The identification results include the coordinates, shape, and type of the impurity. When the waste particles marked as impurities or coated materials move along the conveyor belt to the position corresponding to the high-pressure airflow nozzle, the control system triggers the high-pressure airflow nozzle to instantly spray high-pressure airflow. The high-speed airflow impacts the waste particles, causing them to deviate from their original trajectory and fall into the waste collection trough on the side. Meanwhile, the qualified pure fiber waste continues to move forward along the conveyor belt and eventually falls into the pure material bin.

[0034] In some embodiments, to improve the accuracy of recognition, the hyperspectral imaging module adopts a line-scan push-broom imaging method, combined with the high-speed movement of the conveyor belt, to achieve full coverage detection of the material; at the same time, the background color of the conveyor belt can be automatically switched according to the mainstream color of the waste material, for example, a black background band is used for bleached white pulp waste, and a white or blue background band is used for unbleached pulp waste, in order to improve the contrast of the image.

[0035] After step S2, the originally mixed waste is separated into two streams. One stream is high-purity pure fiber waste that does not contain coatings or non-fiber impurities and goes directly into the subsequent pulping process. The other stream is rejects, which include non-fiber foreign matter and coating waste.

[0036] In this embodiment, the rejected materials are further processed. The coated waste materials from the biodegradable tableware rejected in step S2 are transported to the biodegradation treatment unit. The biodegradation treatment unit uses specific microbial communities to degrade and peel off the biodegradable coating on the surface of the waste materials. The peeled substrate fibers are then returned to step S1 for recycling.

[0037] Since plant fiber tableware is an environmentally friendly product, its coating is mostly made of biodegradable materials (such as PLA). While these discarded coating wastes cannot be directly pulped (because the coating makes filtration difficult), they are excellent substrates for biodegradation. The biodegradation treatment unit includes a fermentation tank where engineered bacteria (such as *Bacillus alginolyticus*, *Fusarium*, and other specific PLA-degrading bacteria) enzymatically hydrolyze the coating on the waste surface under suitable temperature (30-40℃) and humidity. After a period of fermentation, the coating is decomposed into small-molecule carbon dioxide and water or oligomers, and the stripped waste effectively becomes clean plant fiber. At this point, these substrate fibers are fed back into step S1 for crushing and re-sorting, maximizing fiber resource recovery and truly achieving "complete utilization."

[0038] The non-fibrous foreign matter removed in step S2 can be further recycled through gravity separation or magnetic separation devices to achieve zero solid waste discharge from the production line.

[0039] For the rejected non-fibrous foreign objects such as metals and plastics, these resources can be recycled and sold to recyclers through subsequent simple gravity sorting and magnetic separation processes, thereby achieving zero solid waste emissions for the entire production line. This not only treats waste materials but also creates additional economic value.

[0040] Furthermore, to cope with the complex and ever-changing conditions on the production floor, such as changes in lighting and the emergence of new types of impurities, the intelligent visual sorting system is equipped with a self-learning function. Specifically, the system periodically collects samples of sorted waste materials for manual review. If a new type of impurity, such as a plastic label of a new color, is found in the sample that the system cannot identify, the manual person marks the sample as a new impurity. The system automatically updates its recognition model using deep learning algorithms, adding the spectral and image features of the new impurity to its database. As the system operates, its recognition accuracy increases, automatically adapting to changes in raw materials without requiring frequent manual parameter adjustments.

[0041] Through the high-precision sorting in step S2, the purity of the raw materials entering the subsequent pulping process has been improved like never before. This has completely solved the problems of broken needles, clumped screens and black spots on products caused by impurities in traditional waste recycling, laying a solid foundation for high-quality pulp regeneration.

[0042] Step S3: The pure fiber waste is decomposed and activated to obtain recycled fiber pulp.

[0043] After sorting in step S2, pure plant fiber waste is obtained. However, as described in the background section, after undergoing a complete thermodynamic cycle of pulping, filtration, and hot pressing and drying, the microstructure and physical properties of these waste fibers undergo irreversible changes, a phenomenon known as keratinization. Keratinization causes the cell walls of the fibers to collapse, the pores inside the fibers to close, the specific surface area to decrease, and the fibers to become stiff and their swelling capacity to drop significantly. If these fibers are directly recycled in production, their binding force will be significantly reduced, resulting in poor paper strength. Therefore, the purpose of step S3 is to activate the fibers to restore or approach the flexibility and binding force of the virgin fibers.

[0044] Specifically, see Figure 2 Step S3 specifically includes: Step S31: Place the pure fiber waste into the decomposition equipment for decomposition to separate the fibers.

[0045] First, the pure fiber waste is transported to the debonding equipment. In this embodiment, a high-consistency hydraulic pulper can be used for debonding, as it can operate under conditions of high pulp concentration. At high concentrations, strong friction occurs between the fibers. This mechanical friction effectively breaks up the fiber clumps in the waste, separating them into individual fibers. Simultaneously, it creates a slight fuzzing effect on the fiber surface, increasing the specific surface area of ​​the fibers and facilitating the penetration and action of subsequent chemical agents.

[0046] During the fiber separation process, it is necessary to control the rotation speed and time. For example, the rotation speed should be controlled at 1200~1500 rpm, and the separation time at 15~30 minutes. Excessive mechanical separation, while further separating the fibers, can also cut the fibers, leading to a decrease in the average fiber length, which is detrimental to the paper strength. Therefore, the goal of separation is to separate the fibers into individual strands and minimize the cutting of fiber length.

[0047] Step S32: Add biological enzyme preparations or fiber modifiers to the slurry after desolvation, and carry out a constant temperature reaction under the set temperature and pH conditions to cut off some of the chromophores in the fiber and increase the surface activity of the fiber.

[0048] After the slurry is loosened, it enters the activation reaction stage. This embodiment proposes two activation paths, and the corresponding activation paths can be flexibly selected or combined according to the characteristics of the waste and the cost budget.

[0049] Optionally, a bio-enzyme preparation can be added to the loosened pulp. In this embodiment, the bio-enzyme preparation includes a mixture of lignin-modifying enzymes and cellulase. Lignin in plant fibers is a hydrophobic component and a major cause of fiber yellowing. Lignin-modifying enzymes can selectively oxidize and modify lignin molecules on the fiber surface, causing them to degrade or change their degree of polymerization. This process not only cuts off some chromophores in the fiber, improving the whiteness of the pulp and reducing the amount of subsequent bleaching agent, but more importantly, it removes the cuticle layer on the fiber surface, exposing the internal cellulose and increasing the fiber's hydrophilicity. Cellulase, with strictly controlled addition, mainly acts on the amorphous regions and fine fibers on the fiber surface. By hydrolyzing some microfibers on the fiber surface, it loosens the fiber cell walls, allowing them to reabsorb water and swell, thereby significantly restoring the fiber's flexibility.

[0050] In this embodiment, the amount of mixed enzyme added is 0.05% to 0.5% of the oven-dry slurry weight. If the amount of mixed enzyme added is less than 0.05%, the reaction rate will be too slow due to the limitations of substrate concentration and enzyme activity, and the ideal activation effect cannot be achieved within the industrial time. If the amount of mixed enzyme added is greater than 0.5%, the catalytic effect of the enzyme will be too violent, which will cut the long cellulose chains deep into the fiber surface, causing the fiber itself to be degraded and its strength to drop sharply.

[0051] The isothermal reaction time is 30–90 minutes, the reaction temperature is 40–60°C, and the pH value is adjusted to an acidic environment of 4.5–5.5 or a neutral environment of 7.0–8.0, depending on the enzyme's suitability. Under these conditions, the enzyme activity reaches its peak, enabling efficient fiber modification. After the reaction, the enzyme is usually inactivated by heating to above 80°C and holding for 10 minutes to prevent over-reaction.

[0052] Optionally, a fiber modifier may be added to the loosened pulp. In this embodiment, the fiber modifier includes cationic starch, chitosan, or a bio-based reinforcing agent. Cationic starch is a commonly used papermaking additive. Positively charged cationic starch can adsorb onto the negatively charged surface of plant fibers. It not only acts as a reinforcing agent, but more importantly, it forms a flexible polymer film on the fiber surface. This film fills the micropores after the fibers have become keratinized, increasing the contact area between fibers and thus significantly improving the bonding force between them. Chitosan, as a natural biopolymer, also carries a positive charge and has good film-forming and antibacterial properties. The amino and hydroxyl groups on its molecular chain can form hydrogen bonds with the hydroxyl groups on the fiber surface, which not only enhances the physical strength of the paper but also imparts certain antibacterial properties to the pulp, extending its shelf life.

[0053] Fiber modifiers are used to improve the retention rate and filtration performance of recycled fibers. Due to the high concentration of fine fibers in waste materials, filtration difficulties are a major challenge in recycling processes. By adding fiber modifiers, the filtration performance (freeness or openness) of recycled fiber pulp can be improved to a level similar to that of virgin pulp. Specifically, the deviation between the filtration performance of recycled fiber pulp and virgin pulp can be controlled within ±5%. This means that recycled pulp will not slow down the filtration cycle of the molding machine, ensuring production efficiency.

[0054] S33: Perform multi-stage screening on the treated recycled fiber pulp to remove residual fine fiber bundles and impurities; perform fine grinding on the screened pulp to control the beating degree of the recycled fiber pulp within a preset range.

[0055] After the activation reaction is complete, screening and fine grinding are still required to ensure the quality of the slurry.

[0056] The treated recycled fiber pulp is screened in multiple stages using a pressure screen. The screen gap width of the pressure screen is usually set between 0.15mm and 0.25mm. The purpose of the screening is to remove residual undissolved fiber bundles, pulp droplets, and tiny impurities that may have slipped through the screen, so as to ensure the cleanliness of the pulp.

[0057] Fine refining differs from the previous delamination process. Its main purpose is to mechanically separate and refine the fibers, making the ends of the fibers more fine and increasing their specific surface area and bonding capacity. The screened pulp then enters a disc refiner for fine refining to control the freeness of the recycled fiber pulp within a preset range, such as 30°SR to 45°SR. If the freeness is too low, the fiber bonding force is poor; if the freeness is too high, the pulp drains too slowly on the forming wire, and the resulting paper is brittle, with increased transparency, making it unsuitable for tableware forming.

[0058] Step S4: Real-time detection of fiber quality parameters of recycled fiber pulp, comparison and analysis of fiber quality parameters with virgin pulp parameters, and calculation of the remixing ratio of recycled fiber pulp.

[0059] Traditional waste recycling methods often use a fixed ratio, ignoring fluctuations in the quality of waste fibers and virgin pulp. In fact, not only do different batches of recycled fibers have different degrees of aging, but the physical properties of different batches of virgin pulp also vary.

[0060] This embodiment uses online detection and intelligent algorithms to perform linked analysis of recycled pulp and virgin pulp. Based on the dynamic changes in the fiber quality parameters of the recycled fiber pulp, the remixing ratio of the recycled fiber pulp can be dynamically adjusted in real time, thereby ensuring that the product performance of the target tableware containing the recycled fiber pulp meets the standards.

[0061] First, a pulp parameter detection device is installed before the recycled fiber pulp enters the mixing system. This device can be an integrated online fiber quality analyzer, capable of scanning the pulp flowing through the pipeline in real time to obtain the parameters of the recycled fiber pulp. Fiber quality parameters include at least one of the following: average fiber length, fiber thickness, filtration time, and whiteness value. Average fiber length characterizes the fiber's skeletal support capacity and is a core indicator determining the tensile strength and bursting strength of paper; fiber thickness characterizes the fiber wall thickness, affecting the paper's bulk and stiffness; filtration time characterizes the pulp's dewatering performance; and whiteness value characterizes the pulp's cleanliness and color.

[0062] In this embodiment, the fiber quality parameter is the average fiber length. Step S4 specifically includes: obtaining the physical strength standard of the target tableware to be produced; determining the minimum allowable average fiber length threshold of the recycled fiber pulp based on the physical strength standard and the average fiber length of the virgin pulp; comparing the average fiber length of the recycled fiber pulp with the minimum average fiber length threshold; if the average fiber length is greater than or equal to the minimum average fiber length threshold, calculating the target remixing ratio as a preset benchmark value; if the average fiber length is less than the minimum average fiber length threshold, calculating the target remixing ratio as a correction value lower than the preset benchmark value, or maintaining the preset benchmark value and calculating the compensation addition amount of reinforcing agent.

[0063] The system acquires the physical strength standard of the target tableware to be produced, such as a dry compressive strength ≥1200N. To achieve precise proportioning, the system not only bases its standards on product specifications but also on the actual quality of the virgin pulp to establish acceptance standards for recycled pulp. Based on the physical strength standards and the average fiber length of the virgin pulp, the system dynamically calculates a minimum permissible average fiber length threshold for recycled fiber pulp.

[0064] If the virgin pulp used has long and high-strength fibers, it has strong dilution and strengthening capabilities, and the threshold calculated by the system will be relatively low, meaning that the recycled pulp can meet the standard even if it is slightly inferior. Conversely, if the virgin pulp is of average quality, in order to ensure the overall strength after mixing, the system will automatically raise the threshold and strictly limit the quality of the recycled pulp.

[0065] The system compares the real-time detected average length of recycled fibers with the calculated minimum average fiber length threshold. If the average length of recycled fibers is greater than or equal to the threshold, it indicates that the quality meets the requirements of the current virgin pulp mixing system. In this case, the target recycling ratio is calculated as a preset benchmark value, such as 30%, to maximize the utilization of waste. If the average length of recycled fibers is less than the threshold, it indicates that the quality will drag down the overall strength. In this case, the target recycling ratio is calculated as a correction value lower than the preset benchmark value, such as reduced to 15%, to ensure quality by reducing the amount of recycled fibers. Alternatively, to maintain production, the ratio can be kept unchanged, but the amount of reinforcing agent added can be calculated to compensate for the insufficient fiber length through chemical means.

[0066] By comparing and analyzing recycled fiber pulp with virgin pulp, the calculation result of the remixing ratio depends not only on the quality of the waste material itself, but also on its matching degree with the current virgin pulp, thus ensuring the scientific nature and stability of production control.

[0067] Optionally, when the focus of control is on adjusting the bulk and stiffness of the target tableware, the system uses fiber coarseness as the primary control variable. Since waste fibers typically become finer after keratinization, if the coarseness of the recycled fiber pulp is too low, the finished product will be too dense and have poor stiffness.

[0068] Specifically, the fiber thickness of the virgin pulp is obtained, and the system presets the maximum allowable thickness reduction rate of the recycled fiber pulp. The thickness reduction rate of the recycled fiber pulp relative to the virgin pulp is calculated, and the relationship between this thickness reduction rate and the maximum allowable thickness reduction rate is compared. If the calculated thickness reduction rate of the recycled fiber pulp relative to the virgin pulp is not greater than the maximum allowable thickness reduction rate, the recycled fiber pulp is re-blended according to the preset benchmark value. If the calculated thickness reduction rate of the recycled fiber pulp relative to the virgin pulp is greater than the maximum allowable thickness reduction rate, the system linearly reduces the correction coefficient, and the re-blending ratio is the product of the preset benchmark value and the correction coefficient. The lower the obtained re-blending ratio, the higher the average thickness of the mixed pulp, until the bulk and stiffness requirements of the target tableware are met.

[0069] Optionally, when the control focus is on matching the filtration cycle of the molding machine, the system uses filtration time as the main control variable. The filtration time of the virgin slurry and the maximum allowable filtration time of the mixed slurry for the target tableware molding machine are obtained. Since recycled fibers are mostly fine fibers, filtration is usually slower. The maximum allowable remixing ratio of recycled fiber slurry is calculated, assuming the filtration time of the mixed slurry does not exceed the maximum filtration time of the mixed slurry.

[0070] For example, if the recycled pulp is filtered too slowly, the calculated maximum allowable remixing ratio will be very small to prevent the formation of lumps or insufficient molding.

[0071] Optionally, when the control focus is on ensuring uniform product color, especially when producing high-whiteness tableware, the system uses whiteness value as the primary control variable. The system obtains the whiteness value of the virgin pulp and the minimum whiteness standard for the target tableware. Since recycled fibers are typically yellowish and have lower whiteness, the system can calculate the blending ratio based on ensuring the whiteness value of the target tableware produced from the moderate pulp is not lower than the minimum whiteness standard and based on the principle of color mixing.

[0072] If the recycled pulp turns yellowish, the calculated remixing ratio will be strictly limited to avoid color differences in the finished product.

[0073] Optionally, when calculating the remixing ratio of recycled fiber pulp through multiple dimensions of fiber quality parameters, the above parameters can be comprehensively analyzed based on the principle of minimum. The fiber quality parameters include at least two of the following: average fiber length, fiber thickness, filtration time, and whiteness value. Each of the above parameters is used to independently calculate the corresponding candidate remixing ratio, and the final target remixing ratio is the minimum value among these four candidate remixing ratios.

[0074] Taking the minimum value ensures that the mixed pulp meets standards in all dimensions, including strength, stiffness, production efficiency, and appearance. For example, although the average fiber length allows for a 30% remixing of recycled fiber pulp, the whiteness value only allows for a 20% remixing. Therefore, the final remixing ratio will be locked at 20%, thus ensuring the overall quality of the target tableware meets the standards.

[0075] Through the above-mentioned flexible calculation logic with multiple dimensions and parameters, the system of this application can adapt to different production needs and quality control priorities, and realize intelligent and refined management of waste recycling.

[0076] Step S5: Based on the calculated remixing ratio, the recycled fiber pulp is dynamically transported to the virgin pulp mixing system for mixing to form a mixed pulp.

[0077] The remixing ratio calculated in step S4 is a dynamically changing value. Step S5 needs to be executed precisely, and the recycled fiber pulp is remixed according to the remixing ratio to form a mixed pulp with the virgin pulp. The mixed pulp is used for the subsequent molding and production of tableware.

[0078] The recycled fiber slurry is stored in a reuse slurry tank equipped with a stirring device. The stirring device rotates continuously at a low speed to prevent fiber flocculation and sedimentation, and to keep the slurry uniform. The intelligent control unit dynamically adjusts the flow rate of the recycled fiber slurry by controlling the speed of the variable frequency pump based on the real-time consumption of slurry by the forming line, so that the actual remixing ratio is infinitely close to the target remixing ratio calculated in step S4.

[0079] Furthermore, the recycled fiber pulp is homogenized online after being mixed with the virgin pulp. Specifically, after the recycled fiber pulp and the virgin pulp are mixed, the mixed pulp is subjected to high-shear mixing treatment to ensure that the components in the pulp are evenly distributed and to eliminate flocculation caused by re-mixing.

[0080] In actual production, it has been found that although both virgin and recycled pulp are macroscopically fiber suspensions, their microscopic properties differ. Virgin pulp has longer fibers, better swelling, and higher charge density; while recycled pulp, after aging and activation treatment, although its performance is somewhat restored, often shows slight differences in fine component content, zeta potential, and freeness compared to virgin pulp. Simply combining the two pulps in the mixing tank can easily lead to uneven mixing, causing localized areas to drain water too quickly or too slowly, ultimately resulting in defects such as cloud-like patterns or uneven thickness on the finished tableware.

[0081] Therefore, in step S5 of this embodiment, an online homogenization step is further set. After the recycled fiber slurry is mixed with the virgin slurry, it is immediately subjected to high-shear mixing treatment through a high-shear static mixer or a dynamic mixer.

[0082] The high-shear mixer features a precise rotor-stator structure. The high-speed rotation of the rotor generates intense centrifugal and hydraulic shear forces. Under the influence of this shear field, fiber flocculation is broken up, and the fibers of the two slurries are forcibly dispersed and re-interwoven. Simultaneously, this step ensures that subsequently added chemical additives are evenly adsorbed onto each fiber, whether virgin or regenerated.

[0083] This step ensures the absolute uniformity of the distribution of each component in the slurry and effectively eliminates local flocculation caused by the performance differences between recycled and virgin fibers, providing a uniform slurry foundation for subsequent molding quality.

[0084] Steps S4 to S5 described above constitute feedforward control, which involves adjusting the mixing ratio based on the slurry quality before production. However, the production environment is dynamic; for example, wear on the forming screen, fluctuations in vacuum levels, and changes in mold temperature can all affect the final product quality. To achieve more precise control, this embodiment further incorporates a closed-loop feedback mechanism.

[0085] Specifically, an online quality monitoring unit is installed at the back end of the molding production line. This unit may include a machine vision inspection system and an online physical strength sampling station. The machine vision inspection system uses an industrial line scan camera to photograph and analyze each piece of tableware after hot pressing, detecting any appearance defects such as cracks, holes, oil stains, and black spots. The online physical strength sampling station uses a robotic arm to periodically sample a certain number of samples for rapid testing of dry pressing strength or wet stiffness.

[0086] Quality data obtained from online quality monitoring unit tests is transmitted back to the intelligent control unit in real time. The system has set quality control thresholds, such as a defect rate of <1% and a strength pass rate of >99%. If the appearance defect rate rises from 0.5% to 2%, mainly manifested as uneven fiber distribution or impurities, the system will determine that the pulp purification is insufficient or the mixing is uneven. In this case, it will automatically reduce the remixing ratio in subsequent batches or issue an instruction to increase the intensity of screening and fine grinding steps. If the average dry pressing strength is detected to have decreased by 5%, the system will determine that the binding force contribution of the recycled fibers is insufficient. In this case, it will automatically adjust the remixing ratio in subsequent batches, such as reducing it by 5%, or instruct the dosing pump to increase the amount of reinforcing agent added in the fiber activation treatment, such as increasing the cationic starch flow rate by 10%.

[0087] This dual control strategy of feedforward slurry parameters and feedback on finished product quality forms a tight closed-loop system, ensuring that the final product quality remains consistent regardless of fluctuations in raw materials.

[0088] Furthermore, the aging degree of the recycled fiber pulp was monitored.

[0089] In a long-term, closed-loop recycling system, fibers may undergo multiple cycles, such as the reuse of scraps, or the production of tableware that generates waste for further reuse. Although each activation restores some properties, the cellulose molecular chains break under repeated wetting, drying, and mechanical shearing, leading to a gradual decrease in the degree of polymerization. This inherent change in molecular structure cannot be fully perceived simply by measuring fiber length. Sometimes the fiber length may be acceptable, but because the degree of polymerization is too low, the fiber becomes brittle and crumbles easily when pressed.

[0090] To prevent excessively aged fibers from affecting the product, this embodiment introduces in-depth aging monitoring.

[0091] The slurry parameter detection device integrates a viscosity detection module. By measuring the intrinsic viscosity or copper ethylenediamine viscosity of the regenerated fiber slurry, the average degree of polymerization of cellulose can be deduced. The system presets a safe threshold for the degree of polymerization, for example, a safe threshold of no less than 600.

[0092] As the number of reuses increases, the system will detect a decreasing trend in slurry viscosity. When the decrease in fiber polymerization degree exceeds the threshold, or the viscosity falls below the set value, it indicates that the fiber has severely aged. At this point, it is difficult to fully restore its strength by relying solely on enzymes or modifiers.

[0093] The intelligent control unit will automatically adjust the activation process strategy, such as choosing to add reducing agent or force waste discharge.

[0094] Optionally, an appropriate amount of reducing agent, such as sodium borohydride solution, can be added to the activation reactor. The reducing agent can repair the break points on the fiber molecular chains, prevent further oxidative degradation, and thus restore the flexibility of the fiber.

[0095] Optionally, if the aging is extremely severe, the system will forcibly discharge a portion of the severely aged pulp and replenish it with a higher proportion of fresh virgin pulp to maintain the overall balance of fiber activity in the system.

[0096] The aging monitoring mechanism greatly extends the recycling life of fibers, enabling plant fiber waste to be utilized multiple times and at high value.

[0097] Based on the above method, this application also constructs a complete closed-loop recycling and processing system 100 for plant fiber biodegradable tableware production waste. (See reference...) Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the closed-loop recycling and processing system for plant fiber biodegradable tableware production waste provided in this application.

[0098] The closed-loop recycling system 100 for plant fiber biodegradable tableware production waste includes a primary crushing device 10, an intelligent visual sorting device 20, a fiber activation treatment device 30, a slurry parameter detection device 40, an intelligent control unit 50, and a dynamic conveying device 60. The primary crushing device 10 performs primary crushing treatment on the waste generated during the production of plant fiber tableware, obtaining crushed waste. The intelligent visual sorting device 20 is connected to the primary crushing device 10 and is used to scan the crushed waste online, identifying and removing waste containing non-fiber foreign matter and waste with surface coatings, obtaining pure fiber waste. The fiber activation treatment device... The device 30 is connected to the intelligent vision sorting device 20 for disintegrating and activating pure fiber waste to obtain recycled fiber pulp; the pulp parameter detection device 40 is used to detect the fiber quality parameters of the recycled fiber pulp in real time; the intelligent control unit 50 is electrically connected to the pulp parameter detection device 40 and the dynamic conveying device 60 respectively, for receiving fiber quality parameters and comparing and analyzing them with the parameters of the original pulp, and calculating the remixing ratio through an intelligent control algorithm; and the dynamic conveying device 60 is used to dynamically convey the recycled fiber pulp to the original pulp mixing system for mixing according to the calculated remixing ratio to form a mixed pulp.

[0099] The primary crushing device 10 is located downstream of the waste collection port of the tableware production line. For example, it is a low-speed, high-torque twin-shaft shredder. It is equipped with intelligent feeding control, which monitors the feed amount through a material level sensor to prevent overload. Its crushing chamber is equipped with wear-resistant alloy steel blades with spiral staggered blade edges, which can both shear and tear. Its discharge port is equipped with a grid screen with adjustable mesh size to ensure that the particle size of the crushed waste is strictly controlled within the range of 10~30mm.

[0100] The intelligent vision sorting device 20 includes a feeding system, a hyperspectral imaging module, an image processing unit, a rejection actuator, and a self-learning terminal.

[0101] The feeding system includes a vibrating feeder and a cloth belt. The vibrating feeder delivers the crushed waste material evenly, and the cloth belt controls the thickness of the material layer through frequency conversion speed regulation to ensure that the waste material is distributed in a single layer on the conveyor belt without stacking.

[0102] The hyperspectral imaging module is installed in a sealed cover at the top of the sorting chamber. It uses a high-brightness halogen light source or LED array to provide uniform illumination, and the spectral range covers the visible light to near-infrared. The hyperspectral camera inside works in line scanning mode, and in conjunction with the movement speed of the conveyor belt, it collects hyperspectral data cubes of the materials in real time.

[0103] The image processing unit is based on a high-performance industrial computer or field-programmable gate array architecture and is equipped with customized spectral analysis algorithm software. The software has pre-stored standard spectral curves for various materials such as plant fibers, PLA coatings, PE / PP plastics, metals, and rubber. Through real-time comparison, it can generate classification masks at a speed of milliseconds.

[0104] The removal actuator consists of a high-pressure airflow nozzle array composed of dozens or even hundreds of high-frequency solenoid valves, installed on the upper side of the tail end of the conveyor belt. Each nozzle corresponds to a transverse section of the conveyor belt. When the image processing unit identifies impurities in a certain section, it immediately triggers the corresponding solenoid valve to open and spray out a high-pressure pulse airflow.

[0105] The self-learning terminal connects to the human-computer interaction interface of the image processing unit. Operators can use this interface to mark misjudged samples, and the system automatically updates the model library.

[0106] The fiber activation treatment unit 30 includes a high-consistency hydraulic pulper, a chemical dosing system, and a reaction tower. The high-consistency hydraulic pulper generates strong turbulence and inter-fiber friction at high concentrations. The chemical dosing system includes several tanks with agitators and precision metering pumps. The tanks are used to store enzyme preparations, cationic starch solutions, modifiers, etc.; the metering pumps are connected to an intelligent control unit to precisely control the dosage. The reaction tower is connected to the outlet of the high-consistency hydraulic pulper to provide a constant-temperature reaction environment for enzyme activation or chemical modification.

[0107] The pulp parameter detection device 40 is installed on the outlet pipe of the reuse pulp tank and mainly includes an online fiber morphology analyzer, a filtration efficiency sensor, and a concentration transmitter. The online fiber morphology analyzer measures fiber length, thickness, crimp index, etc. online. The filtration efficiency sensor measures the filtration performance of the pulp in real time. The concentration transmitter monitors the pulp concentration in real time, providing basic data for calculating the oven-dry fiber content.

[0108] The intelligent control unit 50 typically consists of a programmable logic controller (PLC) and a host computer. The PLC is responsible for the logic control, data acquisition, and actuator driving of the underlying devices. The host computer runs dedicated control software that integrates a data acquisition module, a formula management module, and an alarm and log system. The data acquisition module displays real-time data such as liquid level, slurry concentration, flow rate, and quality parameters for each slurry tank. It also includes the aforementioned re-blending ratio calculation model and aging degree assessment model. The formula management module stores production formulas for different products, such as target strength and whiteness standards. The alarm and log system records critical operations and abnormal alarms, supporting historical data traceability. The host computer also communicates with the factory's manufacturing execution system (MES), receiving production orders and providing feedback on production energy consumption and waste recovery rate.

[0109] The dynamic conveying device 60 includes a recycled slurry tank, a variable frequency delivery pump, a flow meter, and a static mixer. The recycled slurry tank is equipped with a low-speed agitator to prevent slurry flocculation. The variable frequency delivery pump is a non-clogging centrifugal pump or screw pump driven by a frequency converter. The flow meter is installed at the pump outlet, providing real-time flow signal feedback to the intelligent control unit, forming a PID closed-loop control to ensure that the slurry flow rate is completely consistent with the commanded value. The static mixer is installed after the junction of the recycled and primary slurry pipes for online homogenization of the slurry.

[0110] Unlike existing technologies, this application discloses a closed-loop recycling method and system for processing plant fiber biodegradable tableware production waste. The embodiments of this application introduce an intelligent visual sorting system, utilizing hyperspectral imaging technology to accurately identify and remove non-fiber foreign objects and coating areas from the waste, solving the problems of product quality degradation and equipment failure caused by impurities in traditional recycling processes. By subjecting the removed pure fiber waste to specific degreasing and activation treatments, the keratinization damage of the waste fibers is effectively repaired, restoring the fiber's flexibility and binding force, significantly improving the quality of the recycled pulp and making high-proportion recycling possible. Furthermore, by online detection of fiber quality parameters and combined with intelligent control algorithms to dynamically calculate and adjust the recycling ratio, refined management and closed-loop control of the recycling process are achieved, ensuring the stability of the final mixed pulp. This maximizes the utilization of waste resources while ensuring that the physical strength of the finished tableware meets standards, significantly reducing production costs and achieving zero solid waste emissions from the production line.

[0111] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A closed-loop recycling method for waste materials from the production of biodegradable plant fiber tableware, characterized in that, include: S1: Collect the waste generated during the production of plant fiber tableware, and perform primary crushing treatment on the waste to obtain crushed waste; S2: The crushed waste is scanned online to identify and remove waste containing non-fiber foreign matter and waste with coating on the surface, so as to obtain pure fiber waste; S3: The pure fiber waste is subjected to decomposition and fiber activation treatment to obtain recycled fiber pulp; S4: Real-time detection of the fiber quality parameters of the recycled fiber pulp, comparison and analysis of the fiber quality parameters of the recycled fiber pulp with those of the virgin pulp, and calculation of the remixing ratio of the recycled fiber pulp; S5: Based on the calculated remixing ratio, the recycled fiber slurry is dynamically transported to the virgin slurry mixing system for mixing to form a mixed slurry, which is then used for the subsequent molding and production of tableware.

2. The method according to claim 1, characterized in that, In step S3, the process of loosening and activating the pure fiber waste includes: The pure fiber waste is placed in a disintegration device for disintegration to separate the fibers; Add bio-enzyme preparations or fiber modifiers to the slurry after it has been loosened, and carry out a constant temperature reaction under set temperature and pH conditions to cut off some of the chromophores in the fiber and increase the surface activity of the fiber.

3. The method according to claim 2, characterized in that, The bio-enzyme preparation comprises a mixture of lignin-modifying enzymes and cellulases; The amount of the mixed enzyme added is 0.05% to 0.5% of the weight of the oven-dry slurry, the constant temperature reaction time is 30 to 90 minutes, and the reaction temperature is 40 to 60°C.

4. The method according to claim 2, characterized in that, The fiber modifier includes cationic starch, chitosan, or bio-based reinforcing agents; The fiber modifier is used to improve the retention rate and filtration performance of regenerated fibers, so that the filtration performance of regenerated fiber pulp is controlled within ±5% of that of virgin pulp.

5. The method according to claim 2, characterized in that, Step S3, following the delamination and fiber activation treatment, also includes: The treated recycled fiber pulp is subjected to multi-stage screening to remove residual fine fiber bundles and impurities. The screened pulp is finely ground to control the beating degree of the recycled fiber pulp within a preset range.

6. The method according to claim 1, characterized in that, In step S4, the fiber quality parameters include at least one of the following: average fiber length, fiber thickness, filtration time, and whiteness value.

7. The method according to claim 6, characterized in that, In step S4, the fiber quality parameters include the average fiber length. The step of comparing and analyzing the fiber quality parameters of the recycled fiber pulp with those of the virgin pulp, and calculating the re-blending ratio of the recycled fiber pulp, includes: Obtain the physical strength standards for the target tableware to be produced; Based on the physical strength standard and the average fiber length of the virgin pulp, determine the minimum allowable average fiber length threshold for the recycled fiber pulp; Compare the average fiber length of the recycled fiber pulp with the minimum average fiber length threshold. If the average fiber length of the recycled fiber pulp is greater than or equal to the minimum average fiber length threshold, then the target remixing ratio is calculated as a preset benchmark value. If the average fiber length of the recycled fiber pulp is less than the minimum average fiber length threshold, the target remixing ratio is calculated as a correction value lower than the preset benchmark value, or the preset benchmark value is maintained and the compensation addition amount of reinforcing agent is calculated.

8. The method according to claim 1, characterized in that, The method further includes: The coated waste from biodegradable tableware removed in step S2 is transported to the biodegradation treatment unit; The biodegradation treatment unit uses specific microbial communities to degrade and peel off the biodegradable coating on the surface of the waste. The peeled substrate fibers are then returned to step S1 for recycling.

9. The method according to claim 1, characterized in that, In step S2, the rejected non-fibrous foreign matter is further recycled by gravity separation or magnetic separation devices.

10. A closed-loop recycling system for plant fiber biodegradable tableware production waste, characterized in that, For implementing the method of any one of claims 1 to 9, comprising: The primary crushing device is used to perform primary crushing treatment on the waste generated during the production of plant fiber tableware to obtain crushed waste. An intelligent visual sorting device is connected to the primary crushing device and is used to scan the crushed waste online, identify and remove waste containing non-fiber foreign matter and waste with coating on the surface, so as to obtain pure fiber waste. A fiber activation treatment device, connected to the intelligent vision sorting device, is used to decompose and activate the pure fiber waste to obtain recycled fiber pulp. A pulp parameter detection device is used to detect the fiber quality parameters of the recycled fiber pulp in real time. The intelligent control unit is electrically connected to both the pulp parameter detection device and the dynamic conveying device. It receives the fiber quality parameters, compares and analyzes them with the virgin pulp parameters, and calculates the re-blending ratio using an intelligent control algorithm. A dynamic conveying device is used to dynamically convey the recycled fiber pulp to the virgin pulp mixing system for mixing, based on the calculated remixing ratio, to form a mixed pulp.

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