PET (Polyethylene Terephthalate) recycling, modifying and granulating production line

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) recycling, modifying and granulating production line which comprises a first feeding machine, a first metering device, a first extruder, a second feeding machine, a second metering device, a lateral feeding device, a second extruder, an underwater granulating device, a dewatering device, a vibration screening mechanism and a weighing and packaging device, the first metering device is arranged at the discharging end of the first feeding machine; a feeding hole of the first extruder is communicated with a discharging end of the first metering device; and the second feeding machine is suitable for accommodating a plastic modification additive and / or an auxiliary filler. According to the utility model, the PET recycled material can be fully mixed with the plastic modification additive and the auxiliary filler in a molten state, so that higher uniformity and stability are realized, and the mechanical properties, such as tensile strength, impact strength and elongation at break, of the regenerated composite material are remarkably improved, thereby meeting the requirements on high-performance modified regenerated materials.

Description

Technical Field

[0001] The utility model relates to a PET recycling, modification and granulation production line, belonging to the technical field of PET recycling production lines. Background Art

[0002] After searching the prior art, a Chinese patent with publication number CN109352871A was discovered, disclosing a green, circular, intelligent manufacturing system and process for the reuse of PET scraps. This patent utilizes a PET scrap pulverization and processing device, where the PET raw material is crushed by a scrap pulverizer before entering an extruder. However, this process does not involve mixing the recycled PET in a molten state, resulting in deficiencies in the uniformity and performance stability of the final recycled composite material, which can lead to issues such as poor mechanical properties, insufficient tensile strength, and insufficient impact strength. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the defects of the existing technology and provide a PET recycling and modification granulation production line, which can fully mix the PET recycled material with plastic modification additives and auxiliary fillers in a molten state to achieve higher uniformity and stability, and significantly improve the mechanical properties of the recycled composite material, such as tensile strength, impact strength and elongation at break, thereby meeting the demand for high-performance modified recycled materials.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a PET recycling, modification and granulation production line, characterized in that it includes:

[0005] a first loader, wherein the first loader is suitable for accommodating PET recycled materials;

[0006] a first metering device, the first metering device being arranged at a discharge end of the first loader;

[0007] a first extruder, wherein a feed port of the first extruder is connected to a discharge end of the first metering device;

[0008] a second loader, wherein the second loader is suitable for accommodating plastic modifying additives and / or auxiliary fillers;

[0009] a second metering device, the second metering device being arranged at a discharge end of the second loader;

[0010] A side feeding device, the side feeding device is provided with a first feed port and a second feed port, the first feed port is connected to the discharge end of the first extruder, the second feed port is connected to the discharge end of the second metering device, and the side feeding device is provided with a discharge end;

[0011] a second extruder, wherein the feed port of the second extruder is connected to the discharge end of the side feeding device;

[0012] an underwater pelletizing device, wherein a feed end of the underwater pelletizing device is connected to a discharge end of the second extruder;

[0013] A dehydration device, wherein the feed end of the dehydration device is connected to the discharge end of the underwater pelletizing device;

[0014] a vibrating screening mechanism, the vibrating screening mechanism being arranged at the discharge end of the dehydration device;

[0015] A weighing and packaging device, wherein the feed end of the weighing and packaging device is connected to the discharge end of the vibrating screening mechanism.

[0016] Furthermore, in order to improve the cooling performance of the second extruder, the second extruder is provided with a cooling loop, and the cooling loop is provided with a water inlet and a water outlet;

[0017] The PET recycling, modification and granulation production line further comprises a cooling device, which is arranged on the side of the second extruder, and the cooling device comprises:

[0018] A water storage tank body, the water storage tank body is fixedly mounted on the side of the second extruder, the water storage tank body is provided with a water inlet and a water outlet, the water inlet of the water storage tank body is connected to the water outlet of the cooling circuit of the second extruder;

[0019] A circulation pump is installed on the side of the water storage tank body, the water inlet end of the circulation pump is connected to the water outlet of the water storage tank body, and the water outlet end of the circulation pump is connected to the water inlet of the cooling loop of the second extruder.

[0020] Furthermore, in order to reduce bubbles in the material of the second extruder, the second extruder is provided with a vent hole connected to the material;

[0021] The PET recycling, modification and granulation production line further comprises a vacuum exhaust device, which is installed on the side of the second extruder, and the air extraction end of the vacuum exhaust device is connected to the exhaust hole of the second extruder.

[0022] Furthermore, a specific structure of a weighing and packaging device is provided, the weighing and packaging device comprising:

[0023] A material storage silo, which is arranged at the discharge end of the vibrating screening mechanism;

[0024] A quantitative packaging device is fixedly installed below the storage bin.

[0025] Furthermore, the PET recycling, modification and granulation production line also includes a pneumatic control valve, which is arranged at the discharge port of the storage bin, and the discharge end of the pneumatic control valve is connected to the feed end of the quantitative packaging device.

[0026] Furthermore, the first extruder is a single-screw extruder.

[0027] Furthermore, the second extruder is a twin-screw extruder.

[0028] Furthermore, the PET recycling, modification and granulation production line also includes a filter, which is installed at the discharge end of the first extruder.

[0029] Furthermore, the PET recycling, modification and granulation production line also includes a metering pump, the feed port of the metering pump is connected to the discharge port of the filter, and the discharge port of the metering pump is connected to the first feed port of the side feeding device.

[0030] By adopting the above technical solution, the utility model has the following beneficial effects:

[0031] In the utility model, first, the PET recycled material is poured into the first loader, and the PET recycled material is transported to the first metering device by the first loader. After being weighed and measured in the first metering device, the material enters the first extruder. In the first extruder, the PET recycled material undergoes melting, plasticization and pressure building processes, and then enters the side feeding device through a filter. At the same time, the plastic modification additives and auxiliary fillers are transported by the second loader, and after being weighed and measured by the second metering device, they enter the side feeding device. After forced transportation by the side feeding device, the PET recycled material, the plastic modification additives and auxiliary fillers enter the second extruder together with the plastic modification additives and auxiliary fillers, where they are blended and modified. The blended material is granulated by an underwater pelletizing device, and the granulated particles are screened by a vibrating screening mechanism, and the screened particles enter the storage bin. The storage bin is equipped with a pneumatic control valve. After opening, the particles are transported to a quantitative packaging device for packaging and packaging.

[0032] In addition, the second extruder is equipped with a cooling device and a vacuum exhaust system. The cooling device maintains circulation through a circulating pump and a water storage tank, providing temperature control for the second extruder, ensuring that the material is processed within the ideal temperature range, thereby reducing overheating and improving final product quality. The vacuum exhaust system effectively removes moisture and gas from the material, preventing defects such as bubbles, and improving pellet uniformity and performance stability.

[0033] In summary, the utility model realizes efficient, energy-saving and automated PET recycling, modification and granulation, which not only meets the production needs of various modified plastic formula systems, but also improves production efficiency and output through automated processes, and significantly improves the mechanical properties of PET recycled materials, thereby effectively improving the utilization rate of recycled materials, saving resources and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the PET recycling, modification and granulation production line of the present invention;

[0035] Figure 2 This is a schematic diagram of the second extruder of the PET recycling, modification and granulation production line of the present invention;

[0036] Figure 3 This is a schematic diagram of the side feeding device of the PET recycling, modification and granulation production line of the present invention;

[0037] Figure 4 This is a schematic diagram of the weighing and packaging device of the PET recycling, modification and granulation production line of the present invention. DETAILED DESCRIPTION

[0038] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0039] like Figure 1-4 As shown, a PET recycling, modification and granulation production line is characterized by comprising:

[0040] A first loader 1, wherein the first loader 1 is suitable for accommodating PET recycled materials;

[0041] A first metering device 2, which is arranged at the discharge end of the first loader 1;

[0042] a first extruder 3, wherein the feed port of the first extruder 3 is connected to the discharge end of the first metering device 2;

[0043] A second loader 4, wherein the second loader 4 is suitable for accommodating plastic modifying additives and auxiliary fillers;

[0044] A second metering device 5, which is arranged at the discharge end of the second loader 4;

[0045] A side feeding device 6 is provided with a first feed port and a second feed port, the first feed port is connected to the discharge end of the first extruder 3, the second feed port is connected to the discharge end of the second metering device 5, and the side feeding device 6 is provided with a discharge end;

[0046] a second extruder 7, wherein the feed port of the second extruder 7 is connected to the discharge end of the side feeding device 6;

[0047] An underwater pelletizing device 9, wherein the feed end of the underwater pelletizing device 9 is connected to the discharge end of the second extruder 7;

[0048] A dehydration device 10, wherein the feed end of the dehydration device 10 is connected to the discharge end of the underwater pelletizing device 9;

[0049] A vibration screening mechanism 11 is provided at the discharge end of the dehydration device 10;

[0050] The weighing and packaging device 12 has a feeding end connected to the discharging end of the vibrating screening mechanism 11 .

[0051] In this embodiment, if Figure 1 and Figure 3-4 As shown, first, PET recycled material is poured into the first feeder 1, which then conveys it to the first metering device 2. After being weighed and metered in the first metering device 2, the material enters the first extruder 3. In the first extruder 3, the PET recycled material undergoes melting, plasticization, and pressure buildup, then passes through a filter 8 and enters the side feeder 6. Simultaneously, plastic modifying agents and auxiliary fillers are conveyed by the second feeder 4. After being weighed and metered by the second metering device 5, they enter the side feeder 6. After forced conveyance by the side feeder 6, the PET recycled material, plastic modifying agents, and auxiliary fillers enter the second extruder 7, where they are blended and modified. The blended material is pelletized by the underwater pelletizing device 9. The pelletized particles are then screened by the vibrating screening mechanism 11 and enter the storage silo 121. The storage silo 121 is equipped with a pneumatic control valve. When opened, the particles are conveyed to the quantitative packaging device 122 for packaging.

[0052] Specifically, such as Figure 1-2 As shown, the second extruder 7 is provided with a cooling loop, and the cooling loop is provided with a water inlet and a water outlet;

[0053] The PET recycling, modification and granulation production line further includes a cooling device 13, which is arranged on the side of the second extruder 7. The cooling device 13 includes:

[0054] A water storage tank body is fixedly mounted on the side of the second extruder 7. The water storage tank body is provided with a water inlet and a water outlet. The water inlet of the water storage tank body is connected to the water outlet of the cooling circuit of the second extruder 7.

[0055] The circulating pump is installed on the side of the water storage tank body, the water inlet end of the circulating pump is connected to the water outlet of the water storage tank body, and the water outlet end of the circulating pump is connected to the water inlet of the cooling loop of the second extruder 7.

[0056] In this embodiment, if Figure 1-2 As shown, the cooling device 13 introduces cooling water through the cooling loop of the second extruder 7 to maintain the operating temperature of the second extruder 7. The cooling water is stored in the water storage tank of the cooling device 13, and the cooling water is transported to the cooling loop of the second extruder 7 by a circulating pump. The cooling water in the cooling loop exchanges heat with the outer wall of the second extruder 7 to achieve continuous temperature regulation and control.

[0057] Specifically, such as Figure 1-2 As shown, the second extruder 7 is provided with a vent hole connected to the material;

[0058] The PET recycling, modification and granulation production line further includes a vacuum exhaust device 14 , which is installed on the side of the second extruder 7 , and the exhaust end of the vacuum exhaust device 14 is connected to the exhaust hole of the second extruder 7 .

[0059] In this embodiment, if Figure 1-2 As shown, the vacuum exhaust device 14 is connected to the exhaust port and maintains a negative pressure environment within the second extruder 7 by continuously pumping air, effectively preventing the formation of bubbles and impurities during the blending process. During the blending and modification of the materials in the second extruder 7, temperature and pressure fluctuations can cause volatile components, gases, and moisture in the materials to escape, which can affect the quality of the final product. By creating a negative pressure environment within the second extruder 7, the vacuum exhaust device 14 effectively removes residual moisture and volatile substances from the recycled polyethylene terephthalate material, thereby improving the performance of the modified product.

[0060] Specifically, such as Figure 1 and Figure 4 As shown, the weighing and packaging device 12 may have the following structure, including:

[0061] The material storage bin 121 is provided at the discharge end of the vibration screening mechanism 11;

[0062] The quantitative packaging device 122 is fixedly installed below the storage bin body 121.

[0063] In this embodiment, if Figure 1 and Figure 4 As shown, the weighing and packaging device 12 is arranged at the end of the production line, wherein the storage bin 121 is used to temporarily store the recycled modified polyethylene terephthalate particles that have passed the screening by the vibration screening mechanism 11.

[0064] The quantitative packaging device 122 is installed directly below the material storage bin 121 , and the quantitative measurement of the material is achieved through the weighing device of the quantitative packaging device 122 .

[0065] Specifically, such as Figure 4 As shown, the PET recycling, modification and granulation production line also includes a pneumatic control valve, which is arranged at the discharge port of the storage bin 121 , and the discharge end of the pneumatic control valve is connected to the feed end of the quantitative packaging device 122 .

[0066] In this embodiment, if Figure 1 and Figure 4 As shown, a pneumatic control valve is located at the discharge port of the storage silo 121 to control the quantitative discharge of the recovered modified polyethylene terephthalate particles. The pneumatic control valve is pneumatically driven, responsive, stable, and reliable, enabling precise control of material flow and ensuring the continuity and accuracy of the discharge process.

[0067] At the same time, the weighing and packaging device 12 is also provided with a control panel, which is provided with a display and physical buttons for easy operation.

[0068] Specifically, such as Figure 1 As shown, the first extruder 3 is a single-screw extruder.

[0069] Specifically, such as Figure 1 As shown, the second extruder 7 is a twin-screw extruder.

[0070] Specifically, such as Figure 1 As shown, the PET recycling, modification and granulation production line further includes a filter 8 , which is installed at the discharge end of the first extruder 3 .

[0071] Specifically, such as Figure 1 As shown, the PET recycling, modification and granulation production line further includes a metering pump 15 , the feed port of the metering pump 15 is connected to the discharge port of the filter 8 , and the discharge port of the metering pump 15 is connected to the first feed port of the side feeding device 6 .

[0072] In this embodiment, if Figure 1 As shown, the filter 8 adopts a non-stop screen changer, which is installed at the discharge end of the first extruder 3 to filter impurities and unmelted blocks in the molten polyethylene terephthalate recycled material. The screen changer adopts a double-station design, which can quickly replace the filter screen without stopping the machine to ensure the continuity of production. The metering pump 15 is arranged between the filter 8 and the side feeding device 6. In this embodiment, a PLC is also provided as the core of the control system to realize the automatic control of the entire production line. The PLC system is operated through a touch screen human-machine interface, connecting the first loader 1 and the second loader 4, the first metering device 2 and the second metering device 5, the first extruder 3 and the second extruder 7, etc.

[0073] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A PET recovery, modification and granulation production line, characterized in that: include: A first loader (1), wherein the first loader (1) is suitable for accommodating PET recycled materials; A first metering device (2), the first metering device (2) being arranged at the discharge end of the first loader (1); a first extruder (3), wherein the feed port of the first extruder (3) is connected to the discharge end of the first metering device (2); a second loader (4), wherein the second loader (4) is suitable for accommodating plastic modification additives and / or auxiliary fillers; A second metering device (5), the second metering device (5) being arranged at the discharge end of the second loader (4); A side feeding device (6), the side feeding device (6) is provided with a first feed port and a second feed port, the first feed port is connected to the discharge end of the first extruder (3), the second feed port is connected to the discharge end of the second metering device (5), and the side feeding device (6) is provided with a discharge end; a second extruder (7), wherein the feed port of the second extruder (7) is connected to the discharge end of the side feeding device (6); An underwater pelletizing device (9), wherein the feed end of the underwater pelletizing device (9) is connected to the discharge end of the second extruder (7); A dehydration device (10), wherein the feed end of the dehydration device (10) is connected to the discharge end of the underwater pelletizing device (9); a vibrating screening mechanism (11), the vibrating screening mechanism (11) being arranged at the discharge end of the dehydration device (10); A weighing and packaging device (12), wherein the feed end of the weighing and packaging device (12) is connected to the discharge end of the vibration screening mechanism (11).

2. The PET recovery, modification and granulation production line according to claim 1, wherein The second extruder (7) is provided with a cooling loop, and the cooling loop is provided with a water inlet and a water outlet; The invention also comprises a cooling device (13), wherein the cooling device (13) is arranged on the side of the second extruder (7), and the cooling device (13) comprises: A water storage tank body, the water storage tank body is fixedly mounted on the side of the second extruder (7), the water storage tank body is provided with a water inlet and a water outlet, the water inlet of the water storage tank body is connected to the water outlet of the cooling circuit of the second extruder (7); A circulation pump is installed on the side of the water storage tank body, the water inlet end of the circulation pump is connected to the water outlet of the water storage tank body, and the water outlet end of the circulation pump is connected to the water inlet of the cooling loop of the second extruder (7).

3. The PET recovery, modification and granulation production line according to claim 1, is characterized in that, The second extruder (7) is provided with a vent hole connected to the material; It also includes a vacuum exhaust device (14), which is installed on the side of the second extruder (7), and the suction end of the vacuum exhaust device (14) is connected to the exhaust hole of the second extruder (7).

4. The PET recovery, modification and granulation production line according to claim 1, wherein: The weighing and packaging device (12) comprises: A material storage bin (121), the material storage bin (121) being arranged at the discharge end of the vibration screening mechanism (11); A quantitative packaging device (122) is fixedly installed below the material storage bin (121).

5. The PET recovery, modification and granulation production line according to claim 4, is characterized in that, It also includes a pneumatic control valve, which is arranged at the discharge port of the storage bin (121), and the discharge end of the pneumatic control valve is connected to the feed end of the quantitative packaging device (122).

6. The PET recovery, modification and granulation production line according to claim 1, characterized in that: The first extruder (3) is a single-screw extruder.

7. The PET recovery, modification and granulation production line according to claim 1, characterized in that: The second extruder (7) is a twin-screw extruder.

8. The PET recovery, modification and granulation production line according to claim 1, characterized in that: The invention also comprises a filter (8), which is installed at the discharge end of the first extruder (3).

9. The PET recovery, modification and granulation production line according to claim 8, characterized in that: It also includes a metering pump (15), the feed port of the metering pump (15) is connected to the discharge port of the filter (8), and the discharge port of the metering pump (15) is connected to the first feed port of the side feeding device (6).

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