Plastic cleaning method and cleaning system

Abstract

The application discloses a plastic cleaning method and a cleaning system. The plastic cleaning method comprises the following steps: placing uncleaned plastics into a cleaning shell; starting a steam generator; spraying high-temperature and high-pressure steam output by the steam generator onto the plastics in the cleaning shell through a spraying element; adjusting the temperature of the high-temperature and high-pressure steam output by the steam generator and the size of a discharge port on the cleaning shell; and rotating the cleaning shell to heat melt and shrink different types of plastics at different temperatures, so that the plastics of different types are discharged from the discharge port, and the plastics of different types are sorted out. The application adopts the steam generator to output high-temperature and high-pressure steam of different temperatures, and the sorted plastics of different types are reused.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and in particular to a plastic cleaning method and cleaning system. Background Technology

[0002] Waste plastics are difficult to decompose after disposal, polluting the environment. When waste plastics enter the soil, they hinder crop respiration and nutrient absorption, causing soil compaction. Plants also ingest microplastics, impacting human food safety. Plastic waste entering oceans and rivers forms pollution sources, similarly difficult to decompose and forming floating garbage islands. Long-term immersion and decomposition result in some microplastic particles entering aquatic ecosystems. These microplastic particles enter the bodies of fish and shrimp, and if ingested by humans, they remain in their bodies, posing health risks. When waste plastics are burned, they emit CO, vinyl chloride monomer, HCl, methane, NOx, SO2, and aromatic hydrocarbons, severely polluting water and air and significantly impacting human life and health.

[0003] Waste plastics need to be processed and reused to reduce pollution. Currently, waste plastics need to be cleaned before processing, but the surface of waste plastics contains a lot of impurities that are difficult to clean, such as glue, spray paint, mud, sand, oil, etc., which makes it difficult to reuse waste plastics effectively. Summary of the Invention

[0004] The main objective of this invention is to propose a plastic cleaning method that aims to solve the problem that waste plastics have a large number of impurities on their surface that are difficult to clean, making it difficult to reuse waste plastics effectively.

[0005] To achieve the above objectives, the present invention proposes a plastic cleaning method, comprising: a cleaning system, the cleaning system including a housing, a spraying element, and a steam generator; the housing having a rotatable cleaning shell inside, the spraying element located within the cleaning shell, and the spraying element communicating with the steam generator; the plastic cleaning method includes the following steps:

[0006] Place the unwashed plastic into the cleaning shell;

[0007] When the steam generator is turned on, it outputs high-temperature and high-pressure steam, which is then sprayed onto the plastic inside the cleaning shell through the injector.

[0008] By adjusting the temperature of the high-temperature and high-pressure steam output from the steam generator and adjusting the size of the discharge port on the cleaning shell, different types of plastics are heated and shrunk at different temperatures and discharged from the discharge port, thereby separating different types of plastic materials within the plastic.

[0009] In one embodiment, by adjusting the temperature of the high-temperature, high-pressure steam output from the steam generator and adjusting the size of the outlet on the cleaning shell, different types of plastics are rotated and melted at different temperatures, shrinking and exiting from the outlet, thereby separating the different types of plastic materials within the plastic:

[0010] Adjust the size of the discharge port on the cleaning shell to a first preset value, and adjust the steam generator to output high-temperature and high-pressure steam to a preset first temperature. The first plastic material inside the sprayed plastic melts and shrinks into granules, which are then discharged from the discharge port with a size of the first preset value.

[0011] The steam generator outputs high-temperature and high-pressure steam to a preset second temperature, which is greater than the first temperature. The second plastic material inside the sprayed plastic melts and shrinks into granules, which are then discharged from the outlet with a size of a first preset value.

[0012] Continue adjusting the temperature of the high-temperature, high-pressure steam output from the steam generator until the different types of plastic materials within the plastic have been sorted.

[0013] In one embodiment, adjusting the temperature of the high-temperature and high-pressure steam output by the steam generator includes: the cleaning system further includes a temperature sensor and a controller disposed inside the cleaning shell, the controller controlling the temperature of the high-temperature and high-pressure steam output by the steam generator according to the temperature of the temperature sensor, until different types of plastic materials in the plastic reach different melting points and shrink into granules.

[0014] In one embodiment, the output high-temperature and high-pressure steam has different temperatures ranging from 90°C to 350°C.

[0015] In one embodiment, the cleaning system further includes a water treatment device connected to the cleaning shell and the steam generator. After adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator and adjusting the size of the discharge port on the cleaning shell, rotating the cleaning shell to allow different types of plastics to melt and shrink at different temperatures and be discharged from the discharge port, thereby separating different types of plastic materials, the system further includes: the water treatment device recovering the steam condensate sprayed onto the plastic, purifying the water, and then conveying the purified water to the steam generator for reuse.

[0016] In one embodiment, the cleaning system further includes a rotating part and a spraying part. One end of the rotating part extends into the cleaning shell and is rotatably connected to the inner wall of the shell. A plurality of spraying parts are disposed on the rotating part along the axial direction of the rotating part, and a plurality of spraying elements are disposed on the spraying part along the axial direction of the spraying part. The steam generator outputs high-temperature and high-pressure steam, which is then sprayed onto the plastic inside the cleaning shell by the spraying elements. The system further includes the plurality of spraying elements simultaneously cleaning the plastic inside the cleaning shell.

[0017] In one embodiment, after adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator and adjusting the size of the discharge port on the cleaning shell, rotating the cleaning shell to allow different types of plastics to melt and shrink at different temperatures and discharge from the discharge port, thereby separating different types of plastic materials, the method further includes: dehydrating the cleaned plastics.

[0018] The present invention also provides a plastic cleaning system for implementing the plastic cleaning method described above, comprising a housing, a spraying element, and a steam generator. The housing contains a rotatable cleaning shell. The cleaning shell has an adjustable discharge port. The spraying element is disposed inside the cleaning shell, and the steam generator's steam outlet is connected to the spraying element.

[0019] In one embodiment, the cleaning shell includes a first cleaning shell and a second cleaning shell sleeved inside the first cleaning shell. The second cleaning shell is used to hold plastic. The first cleaning shell is provided with a first discharge port, and the second cleaning shell is provided with a second discharge port. The first cleaning shell can rotate relative to the second cleaning shell to make the first discharge port communicate with the second discharge port. The first cleaning shell and the second cleaning shell rotate synchronously to discharge the cleaned plastic out of the cleaning shell sequentially from the second discharge port and the first discharge port.

[0020] In one embodiment, the housing is a double-layer insulation structure.

[0021] The technical solution of this invention uses a steam generator to output high-temperature and high-pressure steam at different temperatures. The high-temperature and high-pressure steam is sprayed onto the plastic through a spray nozzle, which can quickly remove impurities such as glue and oil from the plastic. By adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator and adjusting the size of the discharge port on the cleaning shell, different types of plastics are heated and shrunk at different temperatures and discharged from the discharge port, thereby sorting out different types of plastic materials. The sorted different types of plastics can then be reused. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the plastic cleaning system of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first cleaning shell and the second cleaning shell in the plastic cleaning system of the present invention.

[0025] Explanation of icon numbers:

[0026] 1. Shell; 2. Steam generator; 3. Jetting parts; 4. Rotating part; 5. Jetting part; 6. Water treatment equipment;

[0027] 11. First cleaning shell; 12. Second cleaning shell; 14. Spiral discharge rod;

[0028] 110. First discharge port; 111. Cover plate; 120. Second discharge port; 130. Feed port; 131. First feed port; 132. Second feed port.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] If waste plastics need to be cleaned and reused, the surface of the waste plastics contains a lot of impurities that are difficult to clean, such as glue, which hinders the reuse of plastics.

[0034] Please see Figures 1 to 2 This invention proposes a plastic cleaning method, which includes: a cleaning system comprising a housing 1, a spray element 3, and a steam generator 2; the housing 1 contains a rotatable cleaning shell; the spray element 3 is located within the cleaning shell and is connected to the steam generator 2; the plastic cleaning method includes the following steps:

[0035] Place the unwashed plastic into the cleaning shell;

[0036] When the steam generator 2 is turned on, the steam generator 2 outputs high-temperature and high-pressure steam which is then sprayed onto the plastic inside the cleaning shell through the spray element 3;

[0037] By adjusting the temperature of the high-temperature and high-pressure steam output from the steam generator 2 and adjusting the size of the discharge port on the cleaning shell, different types of plastics are heated and shrunk at different temperatures and discharged from the discharge port, thereby separating different types of plastic materials within the plastic.

[0038] It should be noted that the cleaning shell is rotatably installed inside the housing 1, and the rotation of the cleaning shell drives the plastic after it has been shrunk by heat to be discharged from the outlet.

[0039] It should be noted that if the plastic is small, it can be placed directly into the washing shell. If the plastic is large, such as a whole plastic bottle or plastic bag, it needs to be shredded to the required size (e.g., 3CM-50CM). Adjusting the temperature according to different conditions can shrink different types of plastic into granules. At the same time, the size of the discharge port can be adjusted to sort and collect different types of plastic materials.

[0040] In addition, a feed inlet communicating with the internal space of the cleaning shell is usually provided on the cleaning shell, through which plastic is fed. The size of the feed inlet matches the size of the feed inlet 130 of the shell 1, and the length of the feed inlet is usually about one-third of the length of the entire cleaning shell, which facilitates feeding.

[0041] The high pressure range is 0.3 MPa to 4.5 MPa.

[0042] By spraying high-temperature, high-pressure steam onto the plastic, impurities such as glue can be quickly removed. Different types of plastics have different melting temperatures, which can be adjusted to different values ​​when the material is heated to the melting point. This causes the different types of plastics to shrink into granules at their melting point and exit from the outlet, thus separating the different types of plastic materials. The separated plastics can then be reused.

[0043] In one embodiment, by adjusting the temperature of the high-temperature, high-pressure steam output from the steam generator and adjusting the size of the outlet on the cleaning shell, different types of plastics are rotated and melted at different temperatures, shrinking and exiting from the outlet, thereby separating the different types of plastic materials within the plastic:

[0044] Adjust the size of the discharge port on the cleaning shell to a first preset value, and adjust the steam generator to output high-temperature and high-pressure steam to a preset first temperature. The first plastic material inside the sprayed plastic melts and shrinks into granules, which are then discharged from the discharge port with a size of the first preset value.

[0045] The steam generator outputs high-temperature and high-pressure steam to a preset second temperature, which is greater than the first temperature. The second plastic material inside the sprayed plastic melts and shrinks into granules, which are then discharged from the outlet with a size of a first preset value.

[0046] Continue adjusting the temperature of the high-temperature, high-pressure steam output from the steam generator until the different types of plastic materials within the plastic have been sorted.

[0047] In this embodiment, the discharge port only needs to be adjusted to a first preset value to facilitate the cooling of the plastic inside the cleaning shell, which shrinks into granules upon heating and then exits from the discharge port. The specific first preset value can be set according to requirements.

[0048] In other embodiments, before adjusting the size of the outlet on the cleaning shell to a first preset value, it is necessary to first adjust the size of the outlet on the cleaning shell to an initial preset value. The outlet area of ​​the first preset value is larger than the area of ​​the initial preset value. The purpose of adjusting the size of the outlet on the cleaning shell to the initial preset value is to remove impurities such as glue and paint from the plastic before it is hot-melted, resulting in purer plastic that is easier to reuse after hot-melting.

[0049] The temperature of the injected steam can be adjusted according to the melting point of different plastics. For example, the melting point of polyoxymethylene (POM) is 165℃-175℃, that of polyethylene (PE) is 120℃-136℃, that of polyvinyl chloride (PVC) is 150℃-200℃, that of polypropylene (PP) is 148℃-176℃, that of modified polystyrene (ABS) is around 120℃, that of polystyrene (PS) and ABS is around 120℃, that of polyamide is 215℃-260℃, that of polyester resin (UP) is 140-150℃, that of polyethylene terephthalate (PET) is 225-260℃, and that of polybutylene terephthalate (PBT) is 225℃.

[0050] When melting the first plastic material, polyethylene, the steam temperature is adjusted to a preset first temperature (120℃-136℃), and the melted polyethylene is discharged from the outlet of the first preset value. When melting the second plastic material, polyoxymethylene, the steam temperature is adjusted to a preset second temperature (165℃-175℃), and the melted polyoxymethylene is discharged from the outlet of the first preset value. And so on.

[0051] In one embodiment, adjusting the temperature of the high-temperature and high-pressure steam output by the steam generator 2 includes: the cleaning system further includes a temperature sensor and a controller disposed inside the cleaning shell, the controller controlling the temperature of the high-temperature and high-pressure steam output by the steam generator 2 according to the temperature of the temperature sensor, until different types of plastic materials in the plastic reach different melting points and shrink into granules.

[0052] The controller can also control the steam generator 2 to output high-temperature and high-pressure steam, which is then sprayed onto the plastic inside the cleaning shell by the sprayer 3 and continuously cleaned for a first preset time.

[0053] The first preset time is 15 minutes. The set temperature is used to clean hot melt PE materials. The set temperature causes the PE to shrink into granules after being heated, and then it is discharged from the discharge port of the first cleaning shell.

[0054] The second preset time is 15 minutes, and the set temperature is used to clean hot melt PP. Under the set temperature, the PP melts into granules and is discharged from the discharge port of the first cleaning shell.

[0055] The third preset time is 15 minutes, and the set temperature is used for hot melt cleaning of PVC. The set temperature causes the PVC to turn into a granular state after being heated, and then it is discharged from the discharge port of the first cleaning shell.

[0056] In order to facilitate the discharge of the cleaned plastic from the box shell 1, a spiral discharge rod 14 is provided inside the box shell 1. The rotating blades of the spiral discharge rod 14 can push the cleaned plastic out of the discharge port on the box shell 1.

[0057] In one embodiment, the output high-temperature and high-pressure steam has different temperatures ranging from 90°C to 350°C.

[0058] It should be noted that plastics include different types of materials such as PP, PE, and PVC. The melting points, from lowest to highest, are PP, PE, and PVC. Different temperatures are selected for outputting high-temperature, high-pressure steam depending on the material. The temperature range is 90℃-350℃.

[0059] In one embodiment, the cleaning system further includes a water treatment device 6 connected to the cleaning shell and the steam generator 2. After adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator 2 and adjusting the size of the discharge port on the cleaning shell, rotating the cleaning shell allows different types of plastics to melt and shrink at different temperatures and be discharged from the discharge port, thereby separating different types of plastic materials, the system further includes: the water treatment device 6 recovers the steam condensate sprayed onto the plastic, performs water purification treatment, and then transports the purified water to the steam generator 2 for reuse.

[0060] It should be noted that the water treatment equipment 6 recovers the steam condensate after it is sprayed onto the plastic, and after water purification treatment, it sends the steam to the steam generator 2, which enables the steam condensate to be recycled and reused, preventing waste of water resources.

[0061] In one embodiment, the cleaning system further includes a rotating part 4 and a spraying part 5. One end of the rotating part 4 extends into the cleaning shell and is rotatably connected to the inner wall of the housing 1. A plurality of spraying parts 5 are arranged on the rotating part 4 along the axial direction of the rotating part 4, and a plurality of spraying elements 3 are arranged on the spraying part 5 along the axial direction of the spraying part 5. The steam generator 2 outputs high-temperature and high-pressure steam, which is sprayed onto the plastic inside the cleaning shell through the spraying elements 3. The system further includes the plurality of spraying elements 3 simultaneously cleaning the plastic inside the cleaning shell.

[0062] With multiple spray sections 5 and multiple spray elements 3, it can quickly and efficiently perform hot melt cleaning on the plastic inside the cleaning shell.

[0063] The steam outlet pipe of the steam generator 2 is connected to the internal channel of the rotating part 4, and a sealed bearing is provided between the steam outlet pipe and the rotating part, which not only does not interfere with the rotation of the rotating part 4, but also seals the steam.

[0064] In one embodiment, after adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator 2 and adjusting the size of the discharge port on the cleaning shell, rotating the cleaning shell to allow different types of plastics to melt and shrink at different temperatures and discharge from the discharge port, thereby sorting out different types of plastic materials, the method further includes: dehydrating the cleaned plastics.

[0065] The dehydration process uses conventional dehydration equipment, as long as it can dehydrate the washed plastic.

[0066] The present invention also provides a plastic cleaning system for implementing the plastic cleaning method described above, comprising a housing 1, a spray element 3, and a steam generator 2. The housing 1 is provided with a rotatable cleaning shell; the cleaning shell is provided with a discharge port, the size of which is adjustable; the spray element 3 is disposed inside the cleaning shell; and the steam outlet of the steam generator 2 is connected to the spray element 3.

[0067] In one embodiment, the cleaning shell includes a first cleaning shell 11 and a second cleaning shell 12 sleeved inside the first cleaning shell 11. The second cleaning shell 12 is used to hold plastic. The first cleaning shell 11 is provided with a first discharge port 110, and the second cleaning shell 12 is provided with a second discharge port 120. The first cleaning shell 11 can rotate relative to the second cleaning shell 12 to make the first discharge port 110 and the second discharge port 120 communicate for discharge. The first cleaning shell and the second cleaning shell rotate synchronously to discharge the cleaned plastic out of the cleaning shell sequentially from the second discharge port 120 and the first discharge port 110.

[0068] Specifically, a first inlet 131 is provided on the first cleaning shell 11, which can communicate with the inlet 130. A cover plate 111 is provided on the side of the first cleaning shell 11 away from the second cleaning shell 12. The cover plate 111 is slidably disposed on the first cleaning shell 11. When plastic needs to be put in, the cover plate 111 is slid open to expose the first inlet 131. A second inlet 132 communicating with the first inlet 131 is provided on the second cleaning shell 12. When feeding is required, the cover plate 111 is slid open through the inlet 130 to expose the first inlet 131, and plastic is put in through the first inlet 131 and the second inlet 132. When cleaning begins, the cover plate 111 is slid closed in the opposite direction to close the first inlet 131, and cleaning of the plastic in the second cleaning shell 12 begins. The cover plate 111 can be mounted on the first cleaning housing 11 via a sliding rail. The cover plate 111 uses a common sliding opening or closing method, similar to a sliding window, which will not be described in detail here.

[0069] The specific method for adjusting the rotation of the first cleaning shell 11 relative to the second cleaning shell 12 is as follows: A screw is installed at the position of the first cleaning shell 11 corresponding to the feed port 130, and a nut matching the screw is provided on the second cleaning shell 12. By loosening the screw on the first cleaning shell 11 through the feed port 130, the first cleaning shell 11 rotates relative to the second cleaning shell 12. Then, the screw and the nut on the second cleaning shell 12 are threadedly connected to fix the position between the first cleaning shell 11 and the second cleaning shell 12. The relatively fixed first cleaning shell 11 and the second cleaning shell 12 are then rotated synchronously together under the drive of a driving component (not shown in the figure), such as a motor. When the cleaned plastic needs to be discharged, it will first fall from the second discharge port 120 to the first discharge port 110, and then fall into the housing.

[0070] In this embodiment, both the first cleaning shell 11 and the second cleaning shell 12 are cylindrical in shape, and one end of the rotating part 4 passes through the housing 1 into the cleaning shell and is rotatably connected to the inner wall of the housing 1.

[0071] In one embodiment, the housing 1 is a double-layer insulation structure, which can ensure the temperature inside the cleaning shell and allow the plastic to melt quickly.

[0072] The technical solution of this invention uses the steam generator 2 to output high-temperature and high-pressure steam at different temperatures. The high-temperature and high-pressure steam is sprayed onto the plastic through the spray element 3, which can quickly remove impurities such as glue and oil from the plastic. By adjusting the different temperatures of the high-temperature and high-pressure steam output by the steam generator 2 and adjusting the size of the discharge port on the cleaning shell, different types of plastics are heated and shrunk at different temperatures and discharged from the discharge port, thereby sorting out different types of plastic materials. The sorted different types of plastics can then be reused.

[0073] The plastic cleaning system provided by this invention facilitates the sorting and reuse of plastics of different materials. For example, at different temperatures, one type of plastic falls out of the outlet of the cleaning shell, and at another temperature, another type of plastic of the same kind falls out of the outlet of the cleaning shell.

[0074] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for cleaning plastics, characterized in that, include: A cleaning system includes a housing, jetting components, and a steam generator. The housing contains a rotatable cleaning chamber, and the jetting components are located within the cleaning chamber and communicate with the steam generator. The cleaning system also includes a rotating part and jetting parts. One end of the rotating part extends into the cleaning chamber and is rotatably connected to the inner wall of the housing. Multiple jetting parts are arranged axially on the rotating part, and multiple jetting components are arranged axially on the jetting parts. The system further includes the steam generator outputting high-temperature, high-pressure steam which is then sprayed through the jetting components onto the plastic inside the cleaning chamber. Additionally, multiple jetting components simultaneously clean the plastic inside the cleaning chamber. The cleaning shell includes a first cleaning shell and a second cleaning shell sleeved inside the first cleaning shell. The second cleaning shell is used to hold plastic. The first cleaning shell is provided with a first discharge port, and the second cleaning shell is provided with a second discharge port. The first cleaning shell can rotate relative to the second cleaning shell to make the first discharge port and the second discharge port communicate. The cleaning system also includes a temperature sensor and a controller located inside the cleaning housing; The plastic cleaning method includes the following steps: Place the unwashed plastic into the cleaning shell; When the steam generator is turned on, it outputs high-temperature and high-pressure steam, which is then sprayed onto the plastic inside the cleaning shell through the injector. Adjusting the temperature of the high-temperature and high-pressure steam output from the steam generator and adjusting the size of the discharge port on the cleaning shell, rotating the cleaning shell, allows different types of plastics to melt and shrink at different temperatures and be discharged from the discharge port, thereby separating different types of plastic materials within the plastic. First, adjust the size of the discharge port on the cleaning shell to the initial preset value to discharge impurities from the plastic through the discharge port. Adjust the size of the discharge port on the cleaning shell to a first preset value. The discharge area of ​​the first preset value is larger than the area of ​​the initial preset value. Adjust the steam generator to output high-temperature and high-pressure steam to a preset first temperature. The first plastic material inside the sprayed plastic melts and shrinks into granules, which are discharged from the discharge port with a size of the first preset value. Continue adjusting the temperature of the high-temperature, high-pressure steam output from the steam generator until the different types of plastic materials within the plastic have been sorted.

2. The plastic cleaning method as described in claim 1, characterized in that, The output high-temperature and high-pressure steam has different temperatures ranging from 90℃ to 350℃.

3. The plastic cleaning method as described in claim 1, characterized in that, The cleaning system also includes a water treatment device connected to the cleaning shell and the steam generator. After adjusting the temperature of the high-temperature and high-pressure steam output by the steam generator and adjusting the size of the discharge port on the cleaning shell, different types of plastics are heated and shrunk at different temperatures and discharged from the discharge port, thereby separating different types of plastic materials, the system further includes: the water treatment device recovers the steam condensate sprayed onto the plastic, performs water purification treatment, and then sends the purified water back to the steam generator for reuse.

4. The plastic cleaning method as described in claim 1, characterized in that, The process of adjusting the temperature of the high-temperature and high-pressure steam output from the steam generator and adjusting the size of the outlet on the cleaning shell, rotating the cleaning shell to allow different types of plastics to melt and shrink at different temperatures and exit from the outlet, thereby separating different types of plastic materials, also includes: dehydrating the cleaned plastics.

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