Preparation forming method and production line of high-toughness and high-flowability regenerated PET (polyethylene terephthalate) slices

Abstract

The invention discloses a high-toughness and high-flowability regenerated PET slice preparation forming method and a production line thereof, and relates to the technical field of PET slice preparation forming. Comprising the following steps: demand acquisition: acquiring a user slice forming demand to obtain a user demand; according to the method, the finished product performance obtained by different forming molds under slices with different thicknesses is obtained through the set efficiency optimization method and serves as the auxiliary information, the corresponding auxiliary information is searched through the set searching method to obtain the target adjusting information, and the PET slice thickness of the slicing equipment is adjusted according to the slice thickness information in the target adjusting information. Through the set slice optimization method, when the reference thickness is inconsistent with the target thickness, adaptive optimization is carried out on the adjustment thickness of the slicing equipment, so that the accuracy of obtaining the slice thickness under the user demand is improved, meanwhile, the slice obtaining efficiency is improved, a dynamic adjustment mechanism is embodied, the production process rapidly responds to changes, and the production efficiency is improved. And the possibility of diversified and efficient production can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of PET slice preparation and molding, and in particular to a method for preparing and molding high-toughness and high-fluidity recycled PET slices and a production line thereof. Background Art

[0002] High-toughness recycled PET refers to PET materials that have been recycled and reprocessed, and have undergone special treatment or modification to enhance their impact resistance and ductility. High fluidity means that the material has good fluidity in the molten state. High-toughness and high-fluidity recycled PET not only meet the dual needs of modern industry for performance and environmental protection, but also greatly optimize production efficiency and material quality through slicing preparation and molding. This is not only a reflection of resource recycling, but also in line with the development trend of green and sustainable development.

[0003] Patent publication number CN118906287A discloses a recycled polyester chip, ultrafine denier fiber, and a preparation method thereof. In the preparation method of the recycled polyester chip, polyester waste yarn particles and PET bottle flakes are first cut and compacted at high temperature, and then the compacted polyester waste yarn particles and compacted bottle flakes are cut again and mixed and compacted at high temperature, thereby reducing the deviation range of the bulk density of the final compacted mixture and ensuring that the final compacted mixture can still maintain a good mixing effect after entering the first screw extruder, thereby ensuring a stable screw filling degree, so that the obtained recycled polyester chip characteristic viscosity fluctuation range is smaller and the b value is smaller, thereby meeting the subsequent production needs of ultrafine denier fibers.

[0004] When preparing slices, existing plastic molding technologies generally use fixed slice thickness and manually adjusted parameters. They lack the intelligent ability to automatically calculate and adjust slice thickness in real time according to different molding requirements, resulting in low material utilization and insufficient production efficiency. At the same time, it is difficult to ensure the consistency of product size and performance. In addition, the lack of a dynamic adjustment mechanism makes it difficult for the production process to respond to changes quickly, which easily leads to problems such as waste of residual materials, cumbersome debugging and unstable product quality, limiting the possibility of diversified and efficient production. Therefore, the present invention is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a method for preparing and molding recycled PET chips with high toughness and high fluidity and a production line thereof, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing and molding high-toughness and high-flow recycled PET chips, comprising: Demand acquisition: Obtain user needs by slicing and shaping them; Information acquisition: Preset the molding mold and obtain the required amount of PET slices based on the molding mold; The invention is characterized by comprising: Establishment of information database: Based on the demand for PET slices, the thickness of PET slices with different efficiency and performance of the molding mold is obtained through efficiency optimization method to obtain auxiliary information. The molding mold, PET slice demand and auxiliary information are extracted to obtain reference information, and an information database is established to store the reference information; Auxiliary information determination: Based on user needs and the information database, the target adjustment information corresponding to the user needs is obtained through a search method; Auxiliary information output: adjust the PET slice thickness of the PET slicing device to the target thickness based on the auxiliary information; Thickness monitoring: obtaining the PET slice after the PET slice thickness is adjusted by the PET slicing device to obtain the target slice, and obtaining the thickness of the target slice to obtain the reference thickness; Feedback optimization: Determine whether the reference thickness is consistent with the target thickness to obtain a judgment result. When the judgment result feedback shows that the reference thickness is inconsistent with the target thickness, the slice thickness of the PET slicing device is optimized based on the reference thickness and the target thickness through the slicing optimization method to obtain an optimized PET slicing device. PET slicing is performed based on the optimized PET slicing device to obtain PET slices with the target thickness.

[0007] Furthermore, the efficiency optimization method includes: presetting a PET thickness set, the PET thickness set including several sub-thicknesses, molding PET slices of sub-thickness based on the required amount of PET slices in the molding mold to obtain finished products, recording the molding efficiency, obtaining performance information of the finished product to obtain finished product performance, establishing a correlation between finished product performance and sub-thickness, and integrating finished product performance, sub-thickness, molding efficiency and correlation to obtain auxiliary information.

[0008] Furthermore, the search method includes: when the user demand includes thickness demand or performance demand, when the user demand is thickness demand, traversing the information library based on the thickness demand to obtain a first traversal result, when the traversal result feedback is that the sub-thickness corresponding to the thickness demand does not exist in the information library, extracting auxiliary information of the sub-thickness located at both ends of the thickness demand to obtain a first reference information set, feeding back the first reference information set to the user, monitoring the user feedback, obtaining target adjustment information based on the user feedback, and when the traversal result feedback is that the sub-thickness corresponding to the thickness demand exists in the information library, extracting the sub-thickness corresponding to the thickness demand in the information library. When the user demand is a performance demand, the information library is traversed based on the performance demand to obtain the second traversal result. When the traversal result feedback is that the finished product performance corresponding to the performance demand does not exist in the information library, the auxiliary information of the finished product performance at both ends of the performance demand is extracted to obtain the second reference information set. The second reference information set is fed back to the user, the user feedback is monitored, and the target adjustment information is obtained based on the user feedback. When the traversal result feedback is that the finished product performance corresponding to the performance demand exists in the information library, the auxiliary information of the finished product performance corresponding to the performance demand is extracted from the information library to obtain the target adjustment information.

[0009] Furthermore, the slicing optimization method includes: judging the size relationship between the reference thickness and the target thickness, obtaining the difference between the reference thickness and the target thickness to obtain a target difference; when the reference thickness is greater than the target thickness, reducing the PET slice thickness of the PET slicing device based on the target difference; when the reference thickness is less than the target thickness, increasing the PET slice thickness of the PET slicing device based on the target difference.

[0010] Furthermore, the inspection thickness of the PET slice of the PET slicing device after the first optimization is obtained, and it is judged whether the inspection thickness is consistent with the target thickness. When the inspection thickness is inconsistent with the target thickness, the size relationship between the inspection thickness and the target thickness is judged, and a fixed value is preset. When the inspection thickness is greater than the target thickness, the PET slice thickness of the PET slicing device is reduced based on the fixed value. When the inspection thickness is less than the target thickness, the PET slice thickness of the PET slicing device is increased based on the fixed value. The change trend of the PET slice thickness after the first optimization and the PET slice thickness after the second optimization is judged. When the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is less than the PET slice thickness after the first optimization, the PET slice thickness of the PET slicing device is reduced or increased based on the fixed value. When the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is greater than the PET slice thickness after the first optimization, the PET slice thickness of the PET slicing device is reversely reduced or increased based on the fixed value.

[0011] A production line for preparing and molding high-toughness and high-flow recycled PET chips uses the above-mentioned method for preparing and molding high-toughness and high-flow recycled PET chips. The production line includes an extruder body, a processing tank for pre-treating discarded bottle chips is installed on the top outer wall of the extruder body, a discharge pipe for discharging material is installed on the extruder body, a cooling box is installed on the outer wall of the discharge pipe, and a slicing and molding mechanism for slicing the material discharged from the discharge pipe is installed on the cooling box.

[0012] Furthermore, the slicing and forming mechanism includes a screw slide assembly embedded in the cooling box and driven by a drive motor. A detachable cutter is installed on the slide part of the screw slide assembly, and the cutting surface of the cutter is aligned with the pipe mouth of the discharge pipe. Mounting seats are installed on the four corners of the outer wall of one side of the cooling box, and fixed plates are installed between the mounting seats. A hydraulic cylinder is installed on the fixed plate, and one end of the piston rod of the hydraulic cylinder is fixedly connected to the square plate. Damping rods are installed on the mounting seats, and the piston rod of the damping rod is fixedly connected to the square plate.

[0013] Furthermore, a pressure sensor is embedded in one end of the fixed plate facing the outlet pipe, a liquid inlet pipe is installed on the outer wall of the extruder body near the bottom of the processing tank, and high-speed camera bodies are installed at both ends of the bottom of the outer wall of the cooling box. The two high-speed camera bodies are staggered with each other, and the side image of the slice is obtained through the high-speed camera body.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The method for preparing and molding high-toughness and high-flow recycled PET slices and its production line obtain the performance of finished products obtained by different molding molds under slices of different thicknesses as auxiliary information through a set efficiency optimization method, and search for target adjustment information corresponding to user needs in an information database according to user needs through a set search method. The target adjustment information is specifically slice thickness information. The PET slice thickness of the slicing device is adjusted according to the slice thickness information in the target adjustment information. After the adjustment is completed, the target thickness can be achieved. Through the set slice optimization method, when the reference thickness is inconsistent with the target thickness, the adjustment thickness of the slicing device is adaptively optimized to improve the accuracy of obtaining the slice thickness under user needs, while improving the efficiency of slice acquisition. The dynamic adjustment mechanism is embodied to enable the production process to respond quickly to changes, which is conducive to increasing the possibility of diversified and efficient production.

[0015] At the same time, through the set slicing optimization method, the slice thickness of the PET slicing equipment is adjusted according to the size relationship between the reference thickness and the target thickness combined with the difference between the two, so as to achieve the function of adaptive adjustment, play a role of self-retrieval, reduce the workload of staff and improve slicing efficiency, and detect and correct deviations in time to avoid the majority of uneven slice thickness or excessive deviations, thereby affecting the quality and consistency of the slices. It can also timely adjust the application capabilities in diversified and high-precision demand scenarios, and improve the flexible response capabilities of manufacturing companies to different product specifications and performance requirements.

[0016] At the same time, by starting the hydraulic cylinder, the position of the square plate can be adjusted, and then the distance between the discharge pipe and the square plate can be adjusted, so as to complete the adjustment of the slice thickness. The damping rod is set to make the square plate more stable when moving. At the same time, in order to ensure that the movement of the square plate is more stable and accurate, a displacement sensor can be installed on the square plate. The displacement sensor monitors the moving distance of the square plate to determine the thickness of the slice. Through the set pressure sensor, when the material contacts the pressure sensor, the drive motor is started to drive the cutter to slice the material, thereby improving the response efficiency. The side image of the slice is obtained by the set camera body and the image recognition processing is combined to complete the acquisition of the slice thickness, thereby improving the efficiency of slice thickness acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall process structure of the present invention; Figure 2 It is a schematic diagram of the optimization process structure of the present invention; Figure 3 It is a schematic diagram of the production line structure of the present invention; Figure 4 This is a schematic diagram of the discharge pipe structure of the present invention; Figure 5 It is a schematic structural diagram of the slice forming mechanism of the present invention.

[0018] In the figure: 1. Extruder body; 2. Processing tank; 3. Liquid inlet pipe; 4. Cooling box; 5. Slicing and forming mechanism; 501. Screw slide assembly; 502. Cutter; 503. Mounting seat; 504. Square plate; 505. Pressure sensor; 506. Fixed plate; 507. Hydraulic cylinder; 508. Damping rod; 6. High-speed camera body; 7. Discharge pipe. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] As an intermediate form, slices are easy to store and transport, reducing volume and cost. Slices are granular or flaky and have a large specific surface area, which helps to melt evenly and improve the uniformity of the melt. During the ablation / melting process, the slices can quickly obtain a uniform melt, providing a stable material supply for subsequent further molding. By adjusting the thickness and number of slices, the melting speed and fluidity can be controlled, making it easier to achieve stable molding parameters. After slicing, the uniform particle size and morphology facilitate mixing and modification, ensuring the consistency of material properties, and achieving better process control in the pretreatment, modification and melting links. Slices of different thicknesses and widths can meet the needs of different product specifications and application scenarios, such as films, sheets or injection molding.

[0021] like Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for preparing and molding high-toughness and high-flow recycled PET chips, comprising: Demand acquisition: Obtain user needs by slicing and shaping them; It should be noted that user requirements are obtained based on the user's requirements for slicing, such as the performance of the molded object and the specific slicing thickness required later. During the specific implementation process, an information receiving interface can be added to receive the user's slicing requirements.

[0022] Information acquisition: Preset the molding mold and obtain the required amount of PET slices based on the molding mold; It should be noted that the process of presetting the molding mold is to pre-set the molding mold according to the subsequent need. The molding mold is the mold required for subsequent re-molding using the slices. The demand for PET slices is obtained according to the number of slices required by the molding mold, which can be obtained specifically by the weight of the slices that the molding mold needs to accommodate.

[0023] The invention is characterized by comprising: Establishment of information database: Based on the demand for PET slices, the thickness of PET slices with different efficiency and performance of the molding mold is obtained through efficiency optimization method to obtain auxiliary information. The molding mold, PET slice demand and auxiliary information are extracted to obtain reference information, and an information database is established to store the reference information; It should be noted that the efficiency optimization method is set up to obtain the performance of the finished products obtained by different molding molds under different thickness slices as auxiliary information, and an information database is established to store the molding molds, PET slice requirements and auxiliary information for subsequent retrieval.

[0024] Auxiliary information determination: Based on user needs and the information database, the target adjustment information corresponding to the user needs is obtained through a search method; It should be noted that the target adjustment information corresponding to the user's needs is searched in the information database according to the user's needs through the set search method, and the target adjustment information is specifically the slice thickness information.

[0025] Auxiliary information output: adjust the PET slice thickness of the PET slicing device to the target thickness based on the auxiliary information; It should be noted that the adjustment process, i.e., adjusting the PET slice thickness of the slicing device according to the slice thickness information in the target adjustment information, can achieve the target thickness after the adjustment is completed.

[0026] Thickness monitoring: obtaining the PET slice after the PET slice thickness is adjusted by the PET slicing device to obtain the target slice, and obtaining the thickness of the target slice to obtain the reference thickness; It should be noted that the process of obtaining the target slice from the PET slice after the PET slicing device adjusts the thickness of the PET slice is to select the PET slice to obtain the target slice after adjusting the device, and the process of obtaining the thickness of the target slice to obtain the reference thickness is to obtain the reference thickness by measuring the thickness of the target slice.

[0027] Feedback optimization: Determine whether the reference thickness is consistent with the target thickness to obtain a judgment result. When the judgment result feedback shows that the reference thickness is inconsistent with the target thickness, the slice thickness of the PET slicing device is optimized based on the reference thickness and the target thickness through the slicing optimization method to obtain an optimized PET slicing device. PET slicing is performed based on the optimized PET slicing device to obtain PET slices with the target thickness.

[0028] It should be noted that, through the set slicing optimization method, when the reference thickness is inconsistent with the target thickness, the adjustment thickness of the slicing device is adaptively optimized to improve the accuracy of obtaining the slicing thickness under user requirements and improve the efficiency of slicing acquisition.

[0029] like Figure 1 As shown, the efficiency optimization method includes: presetting a PET thickness set, where the PET thickness set includes several sub-thicknesses, molding PET slices of sub-thicknesses based on the required amount of PET slices in the molding mold to obtain finished products, recording the molding efficiency, obtaining performance information of the finished products to obtain finished product performance, establishing a correlation between finished product performance and sub-thickness, and integrating finished product performance, sub-thickness, molding efficiency, and correlation to obtain auxiliary information.

[0030] It should be noted that the process of presetting the PET thickness set, that is, generating information of different thicknesses to obtain several sub-thicknesses, and molding PET slices of sub-thickness based on the required quantity of PET slices in the molding mold to obtain finished products, is to put a certain amount of PET slices of sub-thickness into the molding mold for molding operations, and obtain the molding efficiency by recording the molding time. The performance information of the finished product is explored to obtain the performance of the finished product, and the performance information includes but is not limited to strength. By establishing the correlation between the performance of the finished product and the sub-thickness, the corresponding auxiliary information can be queried based on the performance of the finished product and one of the sub-thicknesses, which facilitates the search operation.

[0031] like Figure 1 As shown, the search method includes: user requirements include thickness requirements or performance requirements. When the user requirement is a thickness requirement, the information library is traversed based on the thickness requirement to obtain a first traversal result. When the traversal result feedback is that the sub-thickness corresponding to the thickness requirement does not exist in the information library, auxiliary information of the sub-thickness located at both ends of the thickness requirement is extracted to obtain a first reference information set, the first reference information set is fed back to the user, user feedback is monitored, and target adjustment information is obtained based on the user feedback. When the traversal result feedback is that the sub-thickness corresponding to the thickness requirement exists in the information library, auxiliary information of the sub-thickness corresponding to the thickness requirement is extracted from the information library to obtain target adjustment information. When the user requirement is a performance requirement, the information library is traversed based on the performance requirement to obtain a second traversal result. When the traversal result feedback is that the finished product performance corresponding to the performance requirement does not exist in the information library, auxiliary information of the finished product performance located at both ends of the performance requirement is extracted to obtain a second reference information set. The second reference information set is fed back to the user, user feedback is monitored, and target adjustment information is obtained based on the user feedback. When the traversal result feedback is that the finished product performance corresponding to the performance requirement exists in the information library, auxiliary information of the finished product performance corresponding to the performance requirement is extracted from the information library to obtain the target adjustment information.

[0032] It should be noted that the first traversal result is obtained by traversing the information database based on the thickness requirement, and the second traversal result is obtained by traversing the information database based on the performance requirement. That is, the thickness requirement or performance requirement is used as a search keyword to query relevant information in the information database, and the information set is fed back to the user and the user feedback is monitored. In the specific use process, an information receiving end and a sending end can be established. By obtaining the user's address information, that is, an email address or number, etc., the information can be sent to the user, and then the user's feedback can be received through the information receiving end. The target adjustment information is determined through the feedback, that is, the user determines the corresponding auxiliary information or specifies the corresponding thickness, and the auxiliary information of the sub-thickness at both ends of the thickness requirement is extracted to obtain the first reference information set, and the auxiliary information of the finished product performance at both ends of the performance requirement is extracted to obtain the second reference information set. This can facilitate users to understand the corresponding auxiliary information under similar performance requirements and thickness requirements for reference.

[0033] like Figure 1 As shown, the slicing optimization method includes: judging the size relationship between the reference thickness and the target thickness, obtaining the difference between the reference thickness and the target thickness to obtain the target difference; when the reference thickness is greater than the target thickness, reducing the PET slice thickness of the PET slicing device based on the target difference; when the reference thickness is less than the target thickness, increasing the PET slice thickness of the PET slicing device based on the target difference.

[0034] It should be noted that during long-term continuous operation of the slicing equipment, the automatic slice thickness adjustment system may experience certain deviations due to various factors, such as mechanical wear of the equipment, decreased sensor accuracy, temperature fluctuations, changes in material properties, or external environmental interference. If these deviations are not detected and corrected in a timely manner, they may lead to uneven slice thickness or excessive deviations, thereby affecting the quality and consistency of the slices. In addition, the accumulation of such deviations will reduce the stability of the production process, increase scrap and rework rates, and in severe cases even cause the entire production line to be frequently shut down for maintenance, affecting production efficiency and economic benefits. More importantly, if the deviations are not adjusted in a timely manner, it will limit the application capabilities of the equipment in scenarios with diverse and high-precision requirements, and weaken the manufacturing company's ability to flexibly respond to different product specifications and performance requirements. Through the set slicing optimization method, the slice thickness of the PET slicing equipment is adjusted according to the size relationship between the reference thickness and the target thickness and the difference between the two, so as to achieve the function of adaptive adjustment, play a role of self-retrieval, reduce the workload of staff, and improve slicing efficiency.

[0035] like Figure 2As shown, the PET slice thickness of the PET slicing device after the first optimization is obtained to obtain the inspection thickness, and it is judged whether the inspection thickness is consistent with the target thickness. When the inspection thickness is inconsistent with the target thickness, the size relationship between the inspection thickness and the target thickness is judged, and a fixed value is preset. When the inspection thickness is greater than the target thickness, the PET slice thickness of the PET slicing device is reduced based on the fixed value. When the inspection thickness is less than the target thickness, the PET slice thickness of the PET slicing device is increased based on the fixed value. The change trend of the PET slice thickness after the first optimization and the PET slice thickness after the second optimization is judged. When the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is less than the PET slice thickness after the first optimization, the PET slice thickness of the PET slicing device is reduced or increased based on the fixed value. When the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is greater than the PET slice thickness after the first optimization, the PET slice thickness of the PET slicing device is reversely reduced or increased based on the fixed value.

[0036] It should be noted that the above process can be cyclically operated until the inspection thickness is consistent with the target thickness. At the same time, a threshold value for the number of optimizations can also be set. When the number of optimizations reaches the threshold, an alarm message is directly generated and sent to the user to remind the user to perform maintenance and processing. Through the above process, the slices produced by the PET slicing equipment after the first optimization of the slice optimization method can be tested to obtain the inspection thickness. A fixed value is preset. The fixed value is a specific value corresponding to the slice thickness, which is determined according to actual usage. By replacing the difference between the inspection thickness and the target thickness with a fixed value, the regularity can be disrupted, and the effect of adaptive adjustment can be further improved.

[0037] like Figure 3-Figure 5 As shown, a production line for preparing and molding recycled PET chips with high toughness and high fluidity is provided. The production line includes an extruder body 1. A processing tank 2 for pre-treating discarded bottle chips is installed on the top outer wall of the extruder body 1. A discharge pipe 7 for discharging the material is installed on the extruder body 1. A cooling box 4 is installed on the outer wall of the discharge pipe 7. A slicing and molding mechanism 5 for slicing the material discharged from the discharge pipe 7 is installed on the cooling box 4.

[0038] It should be noted that the processing tank 2 needs to have multiple controllable temperature zones to achieve heating, insulation and uniform temperature control, a built-in stirring device to ensure uniform melting of materials, avoid wall sticking, and remove bubbles, and a liquid feeding device interface to flexibly add various additives. It has pressure control and exhaust functions to ensure that there are no excessive bubbles, avoid expansion and bursting, and freely remove impurities, air and volatile substances to keep the materials pure. It has temperature control, safety valve, overheating protection and other safety measures to ensure safe operation. It has a discharge interface to facilitate connection with the extrusion device to ensure smooth and continuous production. Bottle flakes are processed by adding bottle flakes and processing agents into the processing tank 2. After the material is obtained and processed, the processed material is transported to the extruder body 1, and the material entering the extruder body 1 (the bottle flakes that have been pre-treated, crushed, and mixed) is heated to above its melting point to make it become a uniform molten state. The specific process requires multiple heating zones and high-performance heaters. Gradual heating ensures that the plastic is fully melted to avoid local overheating or underheating, and the material is transported to the discharge pipe 7. The material is then cooled and formed by the cooling box 4. The cooling box 4 needs to have a cooling function, such as a liquid circulation cooling mechanism, etc., and the formed material is sliced ​​by the provided slicing molding mechanism 5 to obtain PET slices.

[0039] like Figure 4 and Figure 5 As shown, the slicing and forming mechanism 5 includes a screw slide assembly 501 embedded in the cooling box 4 and driven by a driving motor. A detachable cutter 502 is installed on the slide part of the screw slide assembly 501. The cutting surface of the cutter 502 is aligned with the nozzle of the discharge pipe 7. Mounting seats 503 are installed on the four corners of the outer wall of one side of the cooling box 4. Fixed plates 506 are installed between the mounting seats 503. A hydraulic cylinder 507 is installed on the fixed plate 506. One end of the piston rod of the hydraulic cylinder 507 is fixedly connected to the square plate 504. Damping rods 508 are installed on the mounting seats 503. The piston rod of the damping rod 508 is fixedly connected to the square plate 504.

[0040] It should be noted that when the slice thickness needs to be adjusted, the position of the square plate 504 can be adjusted by starting the hydraulic cylinder 507, and then the distance between the discharge pipe 7 and the square plate 504 can be adjusted to complete the adjustment of the slice thickness. When slicing is required, the drive motor is started to drive the screw slide assembly 501 to move, and then the cutter 502 is driven to move to complete the cutting of the material. By setting the damping rod 508, the square plate 504 can be made more stable when moving. At the same time, in order to ensure that the movement of the square plate 504 is more stable and accurate, a displacement sensor can be installed on the square plate 504, and the displacement sensor is used to monitor the moving distance of the square plate 504 to determine the thickness of the slice.

[0041] like Figure 3As shown, a pressure sensor 505 is embedded in one end of the fixed plate 506 facing the outlet pipe 7, a liquid inlet pipe 3 is installed on the outer wall of the extruder body 1 near the bottom of the processing tank 2, and high-speed camera bodies 6 are installed at both ends of the bottom of the outer wall of the cooling box 4. The two high-speed camera bodies 6 are staggered with each other, and the side image of the slice is obtained through the high-speed camera body 6.

[0042] It should be noted that, through the provided pressure sensor 505, when the material contacts the pressure sensor 505, the drive motor is started to drive the cutter 502 to slice the material. At the same time, in order to improve the slicing efficiency in the future, the electric push rod can also be selected as the driving medium to drive the cutter 502 to slice the material. The processing agent can be added through the provided liquid inlet pipe 3, and the side image of the slice can be obtained through the provided high-speed camera body 6. The thickness of the slice is obtained through image recognition processing. The specific process is to train the image recognition model, use the side image of the slice of the same specification with known thickness as the training material, and determine the thickness corresponding to the side image of the slice by image comparison, thereby reducing the workload of the staff and eliminating the need for the staff to manually measure the thickness of the slice.

[0043] At the same time, the existing technology is to add water or oxygen to the extruder reactor to hydrolyze rPET at high temperature in the reactor, thereby causing the molecules of rPET to break to varying degrees, thereby obtaining low-viscosity rPET. This method will destroy the original characteristics of PET and make the entire production process extremely unstable, with large viscosity fluctuations, and does not meet the market demand for stable viscosity and elasticity of low-viscosity rPET. There is a high demand for the two-component spinning of PET to produce elastic yarns in the market. Currently, the demand can only be met by combining PET with other materials, which is expensive and not conducive to the recycling of PET. The existing technology produces low-viscosity PET by adding water and oxygen or high-temperature degradation. When preparing PET slices on this production line, the additive is added before the bottle slices enter the extruder body 1. The bottle flakes are mixed evenly through a pump, and the additive is delivered through the liquid inlet pipe 3 in conjunction with a liquid metering pump. The additive is PEG600, and the addition ratio is 1.5%. Then it enters the extruder body 1 for melt extrusion. The PET slice product produced in this way has stable quality. The chemical properties of the additive are stable, low-toxic and environmentally friendly. A chemical additive (polyethylene glycol) with a certain molecular weight is injected into the feed section of the extruder through the liquid metering pump. The additive reduces the viscosity by diluting the PET. The entire production process is stable. In addition, its good solubility, low toxicity, chemical stability, moderate viscosity and hygroscopicity make it very suitable for occasions that require safety, stability and environmental protection. The key point is to improve the elongation at break of low-viscosity products, playing a very good role as elastic fiber in the two-component fiber, meeting the application requirements.

[0044] At the same time, mechanically recycled rPET is directly used in cosmetic boxes injection-molded from ABS materials. It is not tough enough and cannot pass the drip test. At the same time, for cosmetic boxes with complex structures, the material melt has insufficient fluidity, resulting in insufficient filling of the parts. The use of rPET modified by a semi-chemical method imported from a certain company costs more than 5 times that of ordinary rPET, and it needs to be ordered from abroad in advance. During the production process, the mechanically recycled rPET bottle flakes are processed in tank 2. During the processing, toughening agents, compatibilizers, high fluidity additives, antioxidant combinations and chain extenders are added. On the basis of ensuring the injection molding performance of rPET and improving the fluidity of rPET, the toughness is further improved, the parts are filled fully, and the drip test problem is solved, so as to replace ABS material injection-molded cosmetic boxes. At the same time, the specific names and weights of toughening agents, compatibilizers, high fluidity additives, antioxidant combinations and chain extenders are shown in Table 1.

[0045] Table 1: Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. A method for preparing and molding high-toughness and high-flow recycled PET chips, comprising: Demand acquisition: Obtain user needs by slicing and shaping them; Information acquisition: Preset the molding mold and obtain the required amount of PET slices based on the molding mold; The invention is characterized by comprising: Establishment of information database: Based on the demand for PET slices, the thickness of PET slices with different efficiency and performance of the molding mold is obtained through efficiency optimization method to obtain auxiliary information. The molding mold, PET slice demand and auxiliary information are extracted to obtain reference information, and an information database is established to store the reference information; Auxiliary information determination: Based on user needs and the information database, the target adjustment information corresponding to the user needs is obtained through a search method; Auxiliary information output: adjust the PET slice thickness of the PET slicing equipment to the target thickness based on the auxiliary information; Thickness monitoring: obtaining the PET slice after the PET slice thickness is adjusted by the PET slicing device to obtain the target slice, and obtaining the thickness of the target slice to obtain the reference thickness; Feedback optimization: Determine whether the reference thickness is consistent with the target thickness to obtain a judgment result. When the judgment result feedback shows that the reference thickness is inconsistent with the target thickness, the slice thickness of the PET slicing device is optimized based on the reference thickness and the target thickness through the slicing optimization method to obtain an optimized PET slicing device. PET slicing is performed based on the optimized PET slicing device to obtain PET slices with the target thickness.

2. The method for preparing and molding high-toughness and high-flow recycled PET chips according to claim 1, characterized in that: The efficiency optimization method includes: presetting a PET thickness set, where the PET thickness set includes a plurality of sub-thicknesses, molding PET slices of the sub-thicknesses based on the required quantity of PET slices in a molding mold to obtain finished products, recording molding efficiency, obtaining performance information of the finished products to obtain finished product performance, establishing a correlation between finished product performance and sub-thicknesses, and integrating finished product performance, sub-thicknesses, molding efficiency, and correlations to obtain auxiliary information.

3. The method for preparing and molding high-toughness and high-flow recycled PET chips according to claim 1, characterized in that: The search method includes: when the user demand includes thickness demand or performance demand, when the user demand is thickness demand, traversing the information library based on the thickness demand to obtain a first traversal result, when the traversal result feedback indicates that the sub-thickness corresponding to the thickness demand does not exist in the information library, extracting auxiliary information of the sub-thickness located at both ends of the thickness demand to obtain a first reference information set, feeding the first reference information set back to the user, monitoring the user feedback, and obtaining target adjustment information based on the user feedback, when the traversal result feedback indicates that the sub-thickness corresponding to the thickness demand exists in the information library, extracting auxiliary information of the sub-thickness corresponding to the thickness demand from the information library to obtain target adjustment information, when the user demand is performance demand, traversing the information library based on the performance demand to obtain a second traversal result, when the traversal result feedback indicates that the finished product performance corresponding to the performance demand does not exist in the information library, extracting auxiliary information of the finished product performance located at both ends of the performance demand to obtain a second reference information set, feeding the second reference information set back to the user, monitoring the user feedback, and obtaining target adjustment information based on the user feedback, when the traversal result feedback indicates that the finished product performance corresponding to the performance demand exists in the information library, extracting auxiliary information of the finished product performance corresponding to the performance demand from the information library to obtain target adjustment information.

4. The method for preparing and molding high-toughness and high-flow recycled PET chips according to claim 1, characterized in that: The slicing optimization method includes: determining the size relationship between a reference thickness and a target thickness, obtaining a difference between the reference thickness and the target thickness to obtain a target difference; when the reference thickness is greater than the target thickness, reducing the PET slice thickness of the PET slicing device based on the target difference; when the reference thickness is less than the target thickness, increasing the PET slice thickness of the PET slicing device based on the target difference.

5. The method for preparing and molding high-toughness and high-flow recycled PET chips according to claim 1, characterized in that: Obtain the inspection thickness of the PET slice of the PET slicing device after the first optimization, determine whether the inspection thickness is consistent with the target thickness, and when the inspection thickness is inconsistent with the target thickness, determine the size relationship between the inspection thickness and the target thickness, preset a fixed value, and when the inspection thickness is greater than the target thickness, reduce the PET slice thickness of the PET slicing device based on the fixed value; when the inspection thickness is less than the target thickness, increase the PET slice thickness of the PET slicing device based on the fixed value; determine the change trend of the PET slice thickness after the first optimization and the PET slice thickness after the second optimization; when the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is less than the PET slice thickness after the first optimization, reduce or increase the PET slice thickness of the PET slicing device based on the fixed value; when the change trend feedback is that the difference between the PET slice thickness after the second optimization and the target thickness is greater than the PET slice thickness after the first optimization, reversely reduce or increase the PET slice thickness of the PET slicing device based on the fixed value.

6. A production line for preparing and molding recycled PET chips with high toughness and high fluidity, characterized by: A method for preparing and molding high-toughness and high-flow recycled PET chips according to any one of claims 1 to 5 is used, and the production line includes an extruder body (1), a processing tank (2) for pre-treating waste bottle chips is installed on the top outer wall of the extruder body (1), a discharge pipe (7) for discharging materials is installed on the extruder body (1), a cooling box (4) is installed on the outer wall of the discharge pipe (7), and a slicing and molding mechanism (5) for slicing the material discharged from the discharge pipe (7) is installed on the cooling box (4).

7. A production line for preparing and molding recycled PET chips with high toughness and high fluidity according to claim 6, characterized in that: The slicing and forming mechanism (5) includes a screw slide assembly (501) embedded in a cooling box (4) and driven by a driving motor. A detachable cutter (502) is installed on the slide portion of the screw slide assembly (501). The cutting surface of the cutter (502) is aligned with the nozzle of the discharge pipe (7). Mounting seats (503) are installed on the four corners of the outer wall of one side of the cooling box (4). A fixed plate (506) is installed between the mounting seats (503). A hydraulic cylinder (507) is installed on the fixed plate (506). One end of the piston rod of the hydraulic cylinder (507) is fixedly connected to the square plate (504). A damping rod (508) is installed on each mounting seat (503). The piston rod of the damping rod (508) is fixedly connected to the square plate (504).

8. The high-toughness and high-flow recycled PET chip production line according to claim 7, characterized in that: A pressure sensor (505) is embedded in one end of the fixed plate (506) facing the outlet of the discharge pipe (7), a liquid inlet pipe (3) is installed on the outer wall of the extruder body (1) near the bottom of the processing tank (2), and high-speed camera bodies (6) are installed at both ends of the bottom of the outer wall of the cooling box (4). The two high-speed camera bodies (6) are staggered with each other, and the side image of the slice is obtained through the high-speed camera bodies (6).

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