A pretreatment process and device for recycling waste plastics

Abstract

The present invention belongs to the technical field of plastic recycling, and in particular, relates to a pretreatment process and device for recycling waste plastics. The pretreatment process for recycling waste plastics of the present invention cools the cleaned plastic at a first cooling temperature T1; performs primary crushing on the cooled plastic; sorts the primary crushed plastic into a first type of plastic and a second type of plastic; performs secondary crushing on the first type of plastic, cools the second type of plastic at a second cooling temperature T2, and performs secondary crushing on the cooled second type of plastic, wherein the second cooling temperature T2 is lower than the first cooling temperature T1, thereby improving the uniformity of the crushing of the plastic after two cooling and crushing at different temperatures.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic recycling, and in particular relates to a pretreatment process and device for recycling waste plastics. Background Art

[0002] Traditional methods for disposing of waste plastics are landfill and incineration, both of which significantly pollute the land and air. However, collecting, sorting, and granulating different plastics for reuse as recycled plastics is both environmentally friendly and allows for a secondary use of waste plastics. Prior art Chinese patent CN104672708B discloses a polyvinyl chloride composite material for recycling waste plastics and a method for preparing the same. This method first removes non-plastic impurities from waste automotive plastic products and then crushes the sorted plastic. However, the crushing of the plastics is uneven, with some plastics crushing well while others crushing poorly. The poorly crushed plastics typically appear as flakes or films. Summary of the Invention

[0003] Based on this, it is necessary to provide a pretreatment process for recycling waste plastics to address the problems existing in the existing technology, so as to solve the problem of poor crushing uniformity in the plastic recycling process in the existing technology when crushing plastics, and also provide a pretreatment device for recycling waste plastics to solve the problem of poor uniformity in the pretreatment device in the existing technology when crushing plastics.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A pretreatment process for recycling waste plastics comprises the following steps:

[0006] S100: Cooling the cleaned plastic at a first cooling temperature T1;

[0007] S200: Initial crushing of the cooled plastic;

[0008] S300: sorting the plastics after primary crushing into first-class plastics and second-class plastics;

[0009] S400: performing secondary crushing on the first type of plastic, cooling the second type of plastic at a second cooling temperature T2, and performing secondary crushing on the cooled second type of plastic, wherein the second cooling temperature T2 is lower than the first cooling temperature T1.

[0010] Furthermore, in step S100, the plastic is washed, dehydrated, and then cooled.

[0011] Furthermore, in step S400, the mass M1 of the sorted first type of plastic and the mass M2 of the sorted second type of plastic are measured, and the cooling temperature and the speed of conveying the second type of plastic are adjusted according to the ratio K between the mass M1 of the first type of plastic and the total mass M1+M2 of the plastic.

[0012] Furthermore, when the ratio K is less than or equal to the first setting parameter C1, the first cooling temperature T1 and the second cooling temperature T2 are lowered, and the speed of conveying the second type of plastic in step S400 is increased.

[0013] Furthermore, when the ratio K is greater than the first setting parameter C1 and less than the second setting parameter C2, the second cooling temperature T2 is lowered, and the speed of conveying the second type of plastic in step S400 is increased.

[0014] Furthermore, when the ratio K is greater than or equal to the second setting parameter C2 and less than or equal to the third setting parameter C3, the second cooling temperature T2 is increased, and the speed of conveying the second type of plastic in step S400 is reduced.

[0015] Furthermore, when the ratio K is greater than the third setting parameter C3, cooling of the second type of plastic is stopped.

[0016] Furthermore, in step S300, the plastic after the primary crushing is sorted into the first type of plastic and the second type of plastic by blowing.

[0017] The beneficial effects of the present invention are as follows: the pretreatment process for recycling waste plastics of the present invention first cleans the plastic to remove impurities on the surface of the plastic by cleaning, then cools the cleaned plastic at a first cooling temperature T1 to make the plastic brittle, and then performs the initial crushing on the plastic. Since different plastics have different plasticities at the same temperature, there will be uneven crushing during the initial crushing, resulting in some plastics being initially crushed into granules and some plastics being film-like or sheet-like types that are not easy to break. Then, the plastics after the initial crushing are sorted into first-class plastics and second-class plastics, wherein the first-class plastics refer to granular plastics and the second-class plastics refer to film-like or sheet-like types. Then, the first-class plastics are crushed for the second time, and the second-class plastics are cooled at a second cooling temperature T2. Since the second cooling temperature T2 is lower than the first cooling temperature, the second-class plastics can become more brittle and more convenient to crush, thereby improving the uniformity of the plastic crushing.

[0018] A pretreatment device for recycling waste plastics is used to implement the above-mentioned pretreatment process for recycling waste plastics. The pretreatment device for recycling waste plastics includes a first cooling module, a first crushing module, a sorting module, a second cooling module, a second crushing module and a control module; the first cooling module is used to cool the cleaned plastic; the first crushing module is used to crush the plastic discharged from the first cooling module; the sorting module is used to sort the plastic after the initial crushing into a first type of plastic and a second type of plastic, the second cooling module is used to cool the second type of plastic, the second crushing module is used to crush the first type of plastic and the cooled second type of plastic, and the control module is used to adjust the cooling temperature of the first cooling module and the second cooling module and the speed of conveying the second type of plastic according to the ratio between the mass of the first type of plastic and the total mass of the plastic.

[0019] Furthermore, the sorting module is a sorting fan.

[0020] The beneficial effects of the present invention are as follows: the pretreatment device for recycling waste plastics of the present invention first uses the first cooling module to cool the plastic to make the plastic brittle, and then uses the first crushing module to perform the initial crushing on the plastic. Since different plastics have different plasticities at the same temperature, there will be uneven crushing during the initial crushing, resulting in some plastics being initially crushed into granules, and some plastics being film-like or sheet-like types that are not easy to break. Then, the sorting module is used to sort the plastics after the initial crushing into the first type of plastic and the second type of plastic, wherein the first type of plastic refers to granular plastic, and the second type of plastic refers to film-like or sheet-like types. Then, the second crushing module is used to perform the secondary crushing on the first type of plastic. As for the second type of plastic, it is cooled by the second cooling module to make the second type of plastic more brittle and more convenient to crush it by the second crushing module, thereby improving the uniformity of the plastic crushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of an embodiment of a pretreatment process for recycling waste plastics according to the present invention;

[0022] Figure 2 This is a schematic structural diagram of an embodiment of a pretreatment device for recycling waste plastics according to the present invention.

[0023] in:

[0024] 100, frame; 210, first conveyor belt; 220, first cooling chamber; 230, first crushing chamber; 240, sorting fan; 310, second conveyor belt; 320, second cooling chamber; 330, third conveyor belt; 340, scraper; 350, second crushing chamber. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element being referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0027] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0028] Refer to the following Figure 1 , describing a pretreatment process for recycling waste plastics provided by an embodiment of the first aspect of the present invention.

[0029] The pretreatment process for recycling waste plastics in this embodiment includes the following steps:

[0030] S100: Cooling the cleaned plastic at a first cooling temperature T1;

[0031] S200: Initial crushing of the cooled plastic;

[0032] S300: sorting the plastics after primary crushing into first-class plastics and second-class plastics;

[0033] S400: performing secondary crushing on the first type of plastic, cooling the second type of plastic at a second cooling temperature T2, and performing secondary crushing on the cooled second type of plastic, wherein the second cooling temperature T2 is lower than the first cooling temperature T1.

[0034] The pretreatment process for recycling waste plastics in this embodiment first cleans the plastic to remove impurities on the surface of the plastic, then cools the cleaned plastic at a first cooling temperature T1 to make the plastic brittle, and then performs a primary crushing on the plastic. Since different plastics have different plasticities at the same temperature, there will be uneven crushing during the primary crushing, resulting in some plastics being initially crushed into granules and some plastics being film-like or sheet-like types that are not easy to break. The plastics after the primary crushing are then sorted into a first type of plastic and a second type of plastic, wherein the first type of plastic refers to granular plastic and the second type of plastic refers to film-like or sheet-like types. The first type of plastic is then crushed for the second time, and the second type of plastic is cooled at a second cooling temperature T2. Since the second cooling temperature T2 is lower than the first cooling temperature, the second type of plastic can become more brittle and easier to crush, thereby improving the uniformity of the plastic crushing.

[0035] It should be noted that the first cooling temperature T1 can be lower than room temperature and does not need to be lower, and can be set between 1-10°C, such as 5°C. The second cooling temperature T2 is intended to make the second type of plastic more brittle to facilitate crushing. Therefore, the second cooling temperature T2 is lower than 0°C and can be set between -20°C and 0°C, such as -5°C. In this embodiment, to save energy, the first cooling temperature T1 can be set to 10°C, and the second cooling temperature T2 can be set to -3°C.

[0036] In one embodiment, in step S100, the plastic is washed, dehydrated, and then cooled. After washing, the plastic contains a lot of water, which affects the crushing efficiency. Dehydration can reduce the water content of the plastic, making crushing more convenient.

[0037] In one embodiment, in step S400, the mass M1 of the sorted first-category plastic and the mass M2 of the sorted second-category plastic are measured, and the cooling temperature and the speed at which the second-category plastic is conveyed are adjusted based on the ratio K between the mass M1 of the first-category plastic and the total mass M1+M2 of the plastic. To save energy and reduce crushing costs, in step S400, the mass M1 of the first-category plastic and the mass M2 of the second-category plastic are first measured, and then the cooling temperature and the speed at which the second-category plastic is conveyed are adjusted based on the ratio K between the mass M1 of the first-category plastic and the total mass M1+M2 of the plastic. Adjusting the cooling temperature may involve adjusting only the first cooling temperature T1 or the second cooling temperature T2, or adjusting both the first cooling temperature T1 and the second cooling temperature T2 simultaneously. Adjusting the speed at which the second-category plastic is conveyed refers to increasing or decreasing the speed at which the second-category plastic is conveyed.

[0038] In one embodiment, preset values ​​C1, C2, and C3 are set, with C1 < C2 < C3. The ratio K is compared with the preset values ​​C1, C2, and C3 to determine how to adjust the cooling temperature and the conveying speed of the second type of plastic, thereby achieving the goal of saving energy and reducing crushing costs while ensuring crushing efficiency. C1 is relatively close to 0, C2 is relatively close to 0.5, and C3 is relatively close to 1. In this embodiment, C1 can be set to 0.1, C2 to 0.5, and C3 to 0.9. In other embodiments, C1 can be set to 0.05, C2 to 0.6, and C3 to 0.95.

[0039] In one embodiment, when the ratio K is less than or equal to the first set parameter C1, the first cooling temperature T1 and the second cooling temperature T2 are lowered, and the conveying speed of the second type of plastic in step S400 is increased. This situation indicates that the mass M1 of the first type of plastic accounts for a very small proportion of the total mass of the plastic, i.e., there is very little granular plastic and a large amount of film or sheet plastic, which further indicates that the plastic is poorly crushed during the initial crushing. In this case, lowering the first cooling temperature T1 improves the initial crushing effect. At the same time, because the second type of plastic has a larger specific gravity, lowering the second cooling temperature T2 and increasing the conveying speed of the second type of plastic can quickly cool and convey a large amount of the second type of plastic, thereby improving the crushing effect of the second type of plastic while preventing accumulation of the second type of plastic.

[0040] In one embodiment, when the ratio K is greater than the first set parameter C1 and less than the second set parameter C2, the second cooling temperature T2 is lowered and the conveying speed of the second type of plastic in step S400 is increased. This indicates that the second type of plastic is relatively abundant, and the difference between the two is not significant, that is, there is more film or sheet plastic and less plastic particles, indicating that the initial crushing effect basically meets the requirements. In this case, by lowering the second cooling temperature T2 and increasing the conveying speed of the second type of plastic, a large amount of the second type of plastic can be quickly cooled and conveyed, improving the crushing effect of the second type of plastic while preventing its accumulation.

[0041] In one embodiment, when the ratio K is greater than or equal to the second set parameter C2 and less than or equal to the third set parameter C3, the second cooling temperature T2 is increased and the conveying speed of the second type of plastic in step S400 is reduced. This indicates that there is a relatively large amount of the first type of plastic, and the difference between the two types is not significant, that is, there is more granular plastic and less film or sheet plastic, indicating that the initial crushing effect basically meets the requirements. In this case, to reduce energy consumption, the second cooling temperature T2 is increased and the conveying speed of the second type of plastic in step S400 is reduced. This method prolongs the cooling time of the second type of plastic, thereby fully cooling the second type of plastic without requiring a lower cooling temperature, thereby saving refrigeration energy.

[0042] In one embodiment, when the ratio K is greater than the third set parameter C3, cooling of the second type of plastic is stopped. This indicates that there is a large amount of the first type of plastic and almost no second type of plastic, indicating that the primary crushing effect is very good. In this case, to reduce energy consumption, cooling of the second type of plastic can be stopped and secondary crushing of the very small amount of the second type of plastic can be performed directly.

[0043] Refer to the following Figure 2 , describing a pretreatment device for recycling waste plastics provided by an embodiment of the second aspect of the present invention.

[0044] The pretreatment device for recycling waste plastics in this embodiment is used to implement the pretreatment process for recycling waste plastics in the embodiment of the first aspect.

[0045] The pretreatment device for recycling waste plastics in this embodiment includes a first cooling module, a first crushing module, a sorting module, a second cooling module, a second crushing module and a control module; the first cooling module is used to cool the cleaned plastic; the first crushing module is used to crush the plastic discharged from the first cooling module; the sorting module is used to sort the plastic after the initial crushing into a first type of plastic and a second type of plastic, the second cooling module is used to cool the second type of plastic, the second crushing module is used to crush the first type of plastic and the cooled second type of plastic, and the control module is used to adjust the cooling temperature of the first cooling module and the second cooling module and the speed of conveying the second type of plastic according to the ratio between the mass of the first type of plastic and the total mass of the plastic.

[0046] Specifically, if Figure 2 As shown, the pretreatment device for recycling waste plastics in this embodiment includes a frame 100, on which a first conveyor belt 210 and a first cooling chamber 220 are provided. The first cooling temperature in the first cooling chamber 220 is T1, and the first cooling chamber 220 constitutes a first cooling module. A first crushing chamber 230 is provided at the end of the first conveyor belt 210, and a first crushing assembly is provided in the first crushing chamber 230. The first crushing assembly and the first crushing chamber 230 constitute a first crushing module.

[0047] A sorting fan 240 is also provided on the frame 100 , and the air outlet of the sorting fan 240 faces the first crushing chamber 230 , so that the plastic after the primary crushing can be sorted. The sorting fan 240 constitutes a sorting module.

[0048] The first crushing chamber 230 has a first discharge port and a second discharge port. A second conveyor belt 310 is provided below the first discharge port. The first type of plastic falls on the second conveyor belt 310 after coming out of the first discharge port of the first crushing chamber 230. A third conveyor belt 330 is provided on one side of the second discharge port. A second cooling chamber 320 is also provided on the frame 100. The first cooling temperature in the second cooling chamber 320 is T2. The second type of plastic falls on the third conveyor belt 330 after coming out of the second discharge port of the first crushing chamber 230.

[0049] A second crushing chamber 350 is also provided on the frame 100, and a second crushing assembly is provided in the second crushing chamber 350. The second crushing chamber 350 and the second crushing assembly constitute a second crushing module. The second conveyor belt 310 and the third conveyor belt 330 can respectively convey the first type of plastic and the second type of plastic into the second crushing chamber 350, so that the second crushing assembly can perform secondary crushing on the two types of plastic.

[0050] The control module is mounted on the frame 100. A first load cell is mounted on the second conveyor belt 310, which measures the mass of the first type of plastic exiting the first discharge port. A second load cell is mounted on the third conveyor belt 330, which measures the mass of the second type of plastic exiting the second discharge port. The control module controls the conveying speeds of the first, second, and third conveyor belts 210, 310, and 330 based on a ratio K between the mass of the first type of plastic and the total mass of the plastic. It also controls the cooling temperature within the first and second cooling chambers 220 and 320. The control program of the control module includes preset values ​​C1, C2, and C3, where C1 < C2 < C3. By comparing the ratio K with the preset values ​​C1, C2, and C3, the control module determines how to adjust the cooling temperature and conveying speed of the second type of plastic, thereby saving energy and reducing crushing costs. C1 is typically close to 0, C2 is typically close to 0.5, and C3 is typically close to 1. In this embodiment, C1 can be set to 0.1, C2 to 0.5, and C3 to 0.9. In other embodiments, C1 can be set to 0.05, C2 to 0.6, and C3 to 0.95.

[0051] Since the plastic is easily adhered to the third conveyor belt 330 after being cooled, in order to fully crush the second type of plastic, the frame 100 is further provided with a scraper 340 tangent to the end of the third conveyor belt 330. The scraper 340 can scrape off the second type of plastic adhering to the third conveyor belt 330, so that the second type of plastic falls smoothly into the second cooling chamber 320.

[0052] The working process of the pre-treatment device for recycling waste plastics in this embodiment is as follows:

[0053] During use, the cleaned and dehydrated plastic is placed on the first conveyor belt 210. The first cooling temperature in the first cooling chamber 220 is T1, and the second cooling temperature in the second cooling chamber 320 is T2. After being cooled by the first cooling temperature T1, the plastic enters the first crushing chamber 230. After being crushed by the first crushing assembly, the first type of plastic enters the second conveyor belt 310. The first load cell measures the mass of the first type of plastic as M1. The second type of plastic enters the third conveyor belt 330. The second load cell measures the mass of the second type of plastic as M2. The first type of plastic is conveyed directly to the second crushing chamber 350 by the second conveyor belt 310. After being cooled in the second cooling chamber 320, the second type of plastic is conveyed to the second crushing chamber 350 by the third conveyor belt 330.

[0054] During use, when the ratio K is less than or equal to the first set parameter C1, the control module lowers the first cooling temperature T1 in the first cooling chamber 220 and the second cooling temperature T2 in the second cooling chamber 320, and increases the speed at which the third conveyor belt 330 conveys the second type of plastic. This indicates that the mass M1 of the first type of plastic accounts for a very small proportion of the total mass of the plastic, i.e., there is less granular plastic and more film or sheet plastic, which in turn indicates that the initial crushing of the plastic is poor. In this case, lowering the first cooling temperature T1 improves the initial crushing effect. At the same time, since the mass of the second type of plastic is larger, lowering the second cooling temperature T2 and increasing the conveying speed of the second type of plastic allows for rapid cooling and conveying of a large amount of the second type of plastic, thereby improving the crushing effect of the second type of plastic while preventing accumulation of the second type of plastic.

[0055] When the ratio K is greater than the first set parameter C1 and less than the second set parameter C2, the control module lowers the second cooling temperature T2 in the second cooling chamber 320 and increases the speed at which the third conveyor belt 330 conveys the second type of plastic. This indicates that the second type of plastic is relatively abundant, and the difference between the two is not significant, that is, there is more film or sheet plastic and less plastic particles, indicating that the initial crushing effect basically meets the requirements. In this case, by lowering the second cooling temperature T2 and increasing the speed at which the second type of plastic is conveyed, a large amount of the second type of plastic can be quickly cooled and conveyed, improving the crushing effect of the second type of plastic while preventing its accumulation.

[0056] When the ratio K is greater than or equal to the second set parameter C2 and less than or equal to the third set parameter C3, the control module increases the second cooling temperature T2 in the second cooling chamber 320 and reduces the speed at which the third conveyor belt 330 conveys the second type of plastic. This indicates that there is a relatively large amount of the first type of plastic, and the difference between the two types is not significant, that is, there is more granular plastic and less film or sheet plastic, indicating that the initial crushing effect basically meets the requirements. In this case, to reduce energy consumption, the second cooling temperature T2 is increased and the speed at which the third conveyor belt 330 conveys the second type of plastic is reduced. This method prolongs the cooling time of the second type of plastic, thereby fully cooling the second type of plastic without requiring a lower cooling temperature, thereby saving refrigeration energy.

[0057] When the ratio K is greater than the third set parameter C3, the control module controls the cooling process of the second cooling chamber 320 and stops cooling the second type of plastic. This indicates that there is a large amount of the first type of plastic and almost no second type of plastic, indicating that the primary crushing effect is very good. In this case, to reduce energy consumption, the cooling of the second type of plastic can be stopped and the very small amount of the second type of plastic can be directly crushed.

[0058] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A pretreatment process for recycling waste plastics, characterized in that: A pretreatment device for recycling waste plastics is used, and the pretreatment device for recycling waste plastics includes a first cooling module, a first crushing module, a sorting module, a second cooling module, a second crushing module and a control module; the first cooling module is used to cool the cleaned plastic; the first crushing module is used to crush the plastic discharged from the first cooling module; the sorting module is used to sort the plastic after the initial crushing into a first type of plastic and a second type of plastic, the second cooling module is used to cool the second type of plastic, the second crushing module is used to crush the first type of plastic and the cooled second type of plastic, and the control module is used to adjust the cooling temperature of the first cooling module and the second cooling module and the speed of conveying the second type of plastic according to the ratio between the mass of the first type of plastic and the total mass of the plastic; The pretreatment process for recycling waste plastics comprises the following steps: S100: Cooling the cleaned plastic at a first cooling temperature T1; S200: Initially crush the cooled plastic; S300: sort the plastics after primary crushing into first-class plastics and second-class plastics; first-class plastics refer to granular plastics, and second-class plastics refer to film-like or sheet-like plastics; S400: Secondarily crush the first type of plastic, cool the second type of plastic at a second cooling temperature T2, and secondarily crush the cooled second type of plastic, wherein the second cooling temperature T2 is less than the first cooling temperature T1. In step S400, the mass M1 of the sorted first type of plastic and the mass M2 of the second type of plastic are measured, and the cooling temperature and the speed of conveying the second type of plastic are adjusted according to the ratio K between the mass M1 of the first type of plastic and the total mass M1+M2 of the plastic. When the ratio K is less than or equal to the first setting parameter C1, the first cooling temperature T1 and the second cooling temperature T2 are lowered. T2, and increase the speed of conveying the second type of plastic in step S400. When the ratio K is greater than the first setting parameter C1 and less than the second setting parameter C2, reduce the second cooling temperature T2 and increase the speed of conveying the second type of plastic in step S400. When the ratio K is greater than or equal to the second setting parameter C2 and less than or equal to the third setting parameter C3, increase the second cooling temperature T2 and reduce the speed of conveying the second type of plastic in step S400. When the ratio K is greater than the third setting parameter C3, stop cooling the second type of plastic. C1 is 0.1, C2 is 0.5, and C3 is 0.

9.

2. The pretreatment process for recycling waste plastics according to claim 1, characterized in that: In step S100, the plastic is washed, dehydrated, and then cooled.

3. The pretreatment process for recycling waste plastics according to claim 1, characterized in that: In step S300, the plastics after primary crushing are sorted into the first type of plastics and the second type of plastics by blowing.

4. The pretreatment process for recycling waste plastics according to claim 1, characterized in that: The sorting module is a sorting fan.

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