KR20060004143A - Method for sorting of plastic - Google Patents

Abstract

The present invention is to classify the recycled materials collected in the collection house into non-plastic and recycled plastics, and then the recycled plastics are accurately sorted by material by the sorting means, and transported to the final recycling plant to be recycled by material As the sorting method, it relates to a recycled plastic sorting method for improving the sorting reliability of the plastic material according to the accurate selection by the sorting means, rather than the identification through the conventional operator's naked eye.

The present invention is a non-plastic material and a large plastic material of the various types of recycled material collected in the collection box is classified into a separate storage box, the collection and the first sorting step (S10) and other sorted into recycled plastic materials, and the collection and the first classification The foreign material removal step (S20) for selecting and removing foreign substances contained in the recycled plastic materials classified through the step (S10), and the recycled plastic material from which the foreign substances have been removed through the foreign material removal step (S20) for each material The second sorting step (S30) and the second sorting step (S30) is made of a transfer step (S40) for transferring the recycled plastic material classified by each material to the recycling plant by a process such as processing or shredding. .

Recycling sorting method, plastic sorting method, plastic sorting machine

Description

Recycling plastic sorting method {Method for sorting of plastic}

1 is a conventional recycling system diagram;

2 is a recycling system diagram according to the present invention;

3 is a process diagram according to the present invention.

The present invention relates to a method for sorting recycled plastics, and more specifically, to classify recycled materials collected in a collection place into non-plastic materials and recycled plastic materials, and then accurately sorting the recycled plastic materials by material by means of sorting means, and finally recycling plant. Recycling plastic sorting method to be recycled for each material by transporting the material, and the sorting of the plastic material is improved by the sorting means instead of the identification through the naked eye of the conventional worker, thereby minimizing the defective rate of the product. The present invention relates to a method for sorting recycled plastics, which enhances product competitiveness by reducing defective rate, solves problems such as waste of manpower and labor, and contaminants caused by pollutants.

In general, waste cans, bottles, and various packaging materials that can be recycled at home or in factories can be recycled. By separating them into the same group and securing resources through reprocessing, resources are saved as well as waste. It is well known that there is an effect of preventing the environmental pollution caused by.

When the garbage is thrown away at home or at a factory, the waste that can be recycled is separated from the waste that is not. The waste that can be recycled is collected through a separate collection operation, and then the same group, namely, metal, paper and glass bottles. And a method of recycling raw materials separated into plastic materials and sending them to recycling plants for recycling as resources.

Referring to this conventional recycling method, Figure 1 is a conventional recycling system diagram, referring to this, the conventional recycling sorting method is to collect the waste separated by recycling to the collection place after the operator is classified into high and low weight by each type The second sorting step (S2) and the second sorting step (S2) and the second sorting step of sorting the recycled products of the low-weight body according to the weight by a separate sorting means through the first sorting step (S1) and the first sorting step (S1) A third sorting step (S3) is performed in which a sorting operation for subdividing each recycling sorted through S2) is performed.

The first sorting step (S1) is to classify the recyclables collected in the collection box according to the size and volume of the large weight body into a separate collection, and transport only the medium and small weight body through the work conveyor, which is a worker First, the recyclables that are not directly transported through the conveying conveyors such as high-load home appliances, large packaging materials, and large plastic materials are separated first and collected in separate collection boxes. Recycled products are transferred to the conveying conveyor.

In addition, the work conveyor, which is transported to the conveying conveyor, the small-weight recyclables are delivered in a straight line to sort the medium-sized recyclable goods by visual identification of a number of workers located on both sides of the work conveyor paper, glass bottles and metal materials And sorted by type such as plastic materials and collected by separate collection, and small or unreduced recycled materials that are not collected are transferred to the next process through the work conveyor.

In addition, the second sorting step (S2) by the sorting means that the small and low-weight recycled material selected in the first sorting step (S1) is put into the heavy weights, such as metals, and the lower heavy weights such as bottles or plastics As the sorting step, this is a small and low-weight body in which the recycled goods that were not sorted through the sorting operation and the collecting operation in the first sorting step (S1) were finally transferred to the work conveyor. The debris or the smallest recycled material is caught by a net or freely dropped by specific gravity and classified into a separate collection box or conveying conveyor, and only other small metal, nonmetallic or glass bottles and plastics are transferred to the next process.

In addition, the third sorting step (S3) is a step of collecting and sorting the granular metal, non-metallic material, glass bottle and plastic material transferred through the second sorting step (S2) through a work conveyor, and further subdividing them. The small metal, non-metallic or glass bottles and plastics finally discharged through the sorting means of the second sorting step (S2) are transferred to a linear work conveyor, and are identified by the plurality of worker visual identifications located on both sides of the work conveyor. It is a step of sorting by more granularity and materials and collecting them by separate collection.

That is, it is divided into small metal and non-metallic metal cans, cans, aluminum cans, and bottle caps, respectively.Then, in the case of glass bottles, according to the size and color and shape of the bottles, beverage bottles, wine bottles and medicine bottles, and transparent bodies The plastic material is further divided into medium and small beverage bottles, medicine bottles, and passage bowls according to the shape of the bottle.

However, the above classification is to classify the recycled goods by the operator's naked eye, and in particular, in the case of plastic materials, polyethylene terephthalate (PET), polyethylene (PE), polypropylene ( PP), polystyrene (PS), polyvinyl chloride (PVC), ABS, etc. are used in a variety of materials, even workers with expertise can not accurately sort and classify each material with the naked eye, and accordingly classified plastic Ash has a problem in that different materials having similar shapes are mixed and classified.

In addition, the material is different as described above, but in a recycling plant, such as a recycled plastic material that is supplied with a mixture of different plastics molded in a similar shape does not perform a separate sorting operation, if the product is molded into a different material The melting point and the reaction point are different according to each material, so that molding is impossible as the final product, and thus there is a problem in that selection reliability such as an increase in the defective rate of the product and, in some cases, the molding apparatus is broken.

Therefore, due to the above problems, recycling factories, etc. are equipped with separate sorting means to sort out the heterogeneous plastic materials mixed with the recycled plastic materials that have been sorted and completed. Due to the increase in the price of the produced product, there is a problem in that the product price is slightly different, but the competitiveness of the product is inferior, such as the preference of products using existing raw materials rather than recycled products cannot be overcome.

In addition, the recycling screening method, the worker directly touches the recycled products containing the contaminant, and thus there is a problem that the contaminant is introduced into the worker's skin or respiratory tract, such that the infection.

The present invention has been made to solve the above problems, and does not rely on the sorting method to manually identify and classify the recycled plastic material with the naked eye of the various recycled products collected in the conventional sorting method, automatically to the sorting means It improves the sorting reliability of plastic materials by accurate sorting work, and recovers the sorting reliability of defect rate reduction when producing products such as recycling factories due to the mixing of different materials, and strengthens product competitiveness due to waste of equipment cost and manpower. The purpose of the present invention is to provide a method of sorting recycled plastics that minimizes energy waste due to resource recycling by inducing consumer consumption in competition between waste and recycled products.

Still another object of the present invention is to automatically sort out the problem that a number of workers in each step are harmed to the worker, such as being contaminated by contaminants contained on the surface or inside of the recycled product by manual sorting operation. The purpose of the present invention is to provide a recycling plastic sorting method which improves the product competitiveness by reducing waste and labor cost by sorting by sorting means.

Still another object of the present invention is to recover the reliability of sorting plastics and defect rate of products by foreign matters by means of various foreign matters removal means for completely removing other foreign matters other than plastics in the process of sorting only plastics among various recycled products collected in the storage. Its purpose is to provide a method for sorting recycled plastics to minimize generation.

Recycling plastic sorting method according to the present invention for achieving the above object is a non-plastic material and a large plastic material from the various recycled materials collected in the collection is classified into a separate storage box, and the other sorted to collect and recycled plastic material First, the classification step, the foreign material removal step of selecting and removing foreign matters contained in the recycled plastic material classified through the collection and the first classification step, and the recycled plastic material from which the foreign material has been removed through this foreign material removal step The second classification step of sorting by each, and the transfer step of transferring the recycled plastic material classified by each material through the second classification step to the recycling plant by a process such as processing or shredding.

The foreign material removal step according to the present invention preferably further comprises a metal material selection step of selecting and removing metal materials contained in the surface or the like among the classified recycled plastic materials by configuring a separate magnetic force selection means.

In the foreign matter removal step according to the present invention, when the recycled plastic material is transferred to the next process, the recycled plastic material, which is a deteriorated heavy weight by the wind power of the wind power unit, is blown and transferred to the next process, and the foreign matter of the heavy load is freely dropped to remove foreign substances It is preferable to further include a specific gravity selection step.

The foreign material removal step according to the present invention preferably further includes a rotational classification step of separating and removing the recycled plastic materials and the foreign substances while rotating the recycled plastic materials by a separate rotation means.

The rotary classification step according to the present invention is preferably rotated through a rotating means and is classified into medium and small by varying the discharge direction according to the recycled plastic material size during discharge.

It is preferable that the recycled plastic material rotated by the wind is provided with the wind power means in the rotary means of the rotary classification step according to the present invention to facilitate the removal of foreign substances.

It is preferable to provide a heating means in the wind power means of the rotary classification step according to the present invention to dry the recycled plastic material by hot air.

The foreign material removal step according to the present invention preferably further comprises a non-metal reclassification step of selecting and removing non-metallic materials contained in the surface or the like among the classified recycled plastic materials by configuring a separate non-metallic sorting means.

In the second classification step according to the present invention, the compression sorting step of compressing and dropping the recycled plastic material from which the foreign matter is removed in the foreign matter removing step and dropping it to a predetermined position is recycled by the sorting means located at a predetermined position through the compression sorting step. It is preferable to form a plastic screening step of selecting the plastic material by material.

In the plastic sorting step according to the present invention, it is preferable that the recycled plastic material is removed by the sorting means provided in each of the transport conveyors of the multi-stage while the compressed recycled plastic material is transported through the multi-stage transport conveyor.

In the second sorting step according to the present invention, the sorting means for sorting the recycled plastic material is preferably irradiated with near-infrared light to spectroscopy the reflected infrared light source, and then the infrared rays are scanned for each wavelength to be selected according to the material of the plastic material.

Hereinafter, the recycling plastic sorting method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a recycling system diagram according to the present invention, Figure 3 is a process chart according to the present invention, with reference to this, the recycling plastic sorting method is to collect and classify the recycled material collected in the collection and the first classification step (S10) and the collection And a foreign material removal step (S20) for removing the foreign matter contained in the plastic material classified in the first classification step (S10) and the plastic material from which the foreign material has been removed in the foreign material removal step (S20) by the sorting means. The second classification step (S30) and the second classification step (S30) consists of a transfer step (S40) for packaging or shredding the recycled plastic material classified for each material and transported to a recycling plant.

In addition, the collection and the first classification step (S10) is a step of classifying the non-plastic material and the large plastic material in a separate storage box of the various recycled products collected in the storage box, the other recycling plastic material, collected in the storage Non-plastic materials such as metal, paper and glass bottles are sorted out from various recycled products, and bulky recycled materials such as large plastic materials are sorted and collected by separate collection, crushed and packaged and transferred to a recycling plant. Only small plastics are transported to the next process by the transfer conveyor.

In addition, the foreign material removal step (S20) is the sorting and the first sorting step (S10) of the small, the plastic material is transported from the supply conveyor is transported on the conveying conveyor to sort and remove the foreign substances contained in the plastic material In the step of collecting and the first classification step (S10), the non-plastic material and the large plastic material is transferred to the recycling plant, the remaining medium, small plastic material is transported from the supply conveyor and transported to the conveying conveyor, the medium, small plastic It removes foreign substances stuck between the ashes or surfaces, or adhered to by moisture, and transfers only pure plastic material to the next process.

Meanwhile, in the foreign material removal step (S20), the metal material selection step (S210) of selecting a metal material among the foreign substances contained in or contained in the plastic material, and the non-plastic material having a higher specific gravity than the plastic material by wind power, freely removes foreign substances. Specific gravity screening step (S220), and the rotary classification step (S230) for separating the foreign matter dried by drying the plastic material by the rotating means and the wind means, and the non-metallic material sorting step for selecting the non-metallic material contained or contained in the plastic material ( S240) and the like.

In this case, the foreign material removal step (S20) is a step of removing foreign substances contained in or contained in the plastic material, the order of each step can be changed in the order of the steps according to how the foreign matter can be surely removed. You can add or delete steps consecutively.

In addition, in the metal material selection step (S210) by forming a separate magnetic force selection means to remove and remove the metal material in close contact between the classified recycled plastic materials or moisture, which is any of the conveying conveyor that the plastic material is transported A separate magnetic force selection means is provided at one side to remove foreign substances such as metals contained in or contained in the plastic material passing therethrough. The magnetic force selection means generates a magnetic force to remove the metal material contained between the plastic material and the surface. In this case, magnetic force selection means using magnetic is preferably used, but not limited thereto, and any means can be used as long as it can remove the metal material.

For example, a permanent magnet is fastened or magnetized to a drive roller constituting a conveying conveyor, and the metal material is inserted into a plastic material or adsorbed to a surface, and the metal material is rotated in the same manner as the drive roller, and the metal material is freely dropped by separating a metal installed on the floor surface. It is also possible to separate and remove the metal material.

And, in the specific gravity screening step (S220), when the recycled plastic material is transferred to the next process by the conveying conveyor, the recycled plastic material, which is a deteriorated heavy weight by the wind power of the wind means, is blown and transferred to the next process. As the foreign material is removed, the wind power of the wind power means is provided with a wind power means before the transfer of the divided space or the next process of the transfer conveyor for transporting the recycled plastic material classified in the first classification step (S10). The plastic material is blown to a strength enough to be blown and then transferred to the next conveying conveyor or the next process, and the heavy load is freely dropped into the interspace to remove foreign substances.

In addition, the rotation classification step (S230) is a step of separating and removing the recycled plastic materials and the foreign matter while rotating the recycled plastic materials in a separate rotation means, the plastic material to be transferred to the conveying conveyor is rotated by a separate rotation means As a result, foreign substances stuck or adhered to or between the plastic materials are removed.

In this case, it is rotated through the rotation means of the rotary classification step (S230) and to be classified as medium, small by varying the discharge direction according to the size of the recycled plastic material during discharge, for example, small according to the size of the mesh type mesh It is preferable that the plastic material of the free fall down, medium plastic material is discharged to the outlet of one side to be separated to be transported to the next process.

In addition, it is preferable to provide a wind power means to the rotation means of the rotary classification step (S230) to facilitate the removal of foreign substances while the recycled plastic material is rotated by the wind, in this case, the wind power means of the rotary classification step (S230) It is preferable to provide a heating means to shorten the drying time of the recycled plastic material by hot air.

On the other hand, the non-metal sorting step (S240) is a step of separating and removing the non-metallic material contained in the surface or the like between the sorted recycled plastic material by configuring a separate non-metallic sorting means, the non-metallic sorting means at one end of the conveying conveyor It is a step of removing and removing the non-metallic material contained in the surface or between the recycled plastic materials provided with.

Thus, the foreign matter removal step (S20) is the next step by removing the foreign matter between the non-plastic material or debris contained or contained on the surface or between the recycled plastic materials classified in the first classification step (S10) in a variety of ways as described above. In the classification step (S30) is to minimize the occurrence of errors when selecting the plastic material.

In addition, the second classification step (S30) is to classify the recycled plastic material transported in the foreign material removal step (S20) for each material, and the recycled plastic material from which the foreign material is removed in the foreign material removal step (S20) transfer conveyor. As it is transported through, the sorting process is precisely performed by PET, PP, PE, PS, ABS, etc. for each material of the plastic material by a separate sorting means rather than the sorting by the naked eye of the worker as in the prior art.

In this case, the second classification step (S30) is a compression sorting step (S310) for compressing and dropping the recycled plastic material from which the foreign matters have been removed in the foreign matter removing step (S20) to a predetermined position, and the compression sorting step (S310) Through the sorting means located in the predetermined position through the plastic sorting step (S320) for sorting the recycled plastic material by material, that is, the compression sorting step (S310) is a hopper to which the plastic material from which the foreign material is removed and the The plastic material provided from the hopper is compressed to a predetermined size and dropped to a predetermined position. For example, the plastic material is compressed through a compression roller and then molded into a predetermined size. It is preferable that an awl or the like can be formed on the surface of the roller.

In addition, the plastic sorting step (S320) is to sort the plastic material by each material by the sorting means for the plastic material is compressed to a predetermined shape through a compression sorting step (S310), for example, foreign matter is As the removed and compressed recycled plastic material is transported through the multi-stage transfer conveyor, the recycled plastic material is preferably sorted by material by the sorting means provided in each of the multi-stage transfer conveyors, and the sorting means is reflected by irradiating near infrared rays. After the spectroscopic infrared light source is analyzed by scanning the infrared wavelength by wavelength to be selected by the material of the plastic material.

For example, the sorting means condenses a halo ganlamp for irradiating a halogen light source to the plastic material and infrared rays reflected from the plastic material irradiated by the halo ganlamp and condensing / balancing lenses for equilibrating the condensed light source. Collimator Lens) and the optical fiber condensing / equalizing light from the condensing / parallel lens, and the monochromatic light processing unit (Monochrometer) which detects and converts a predetermined infrared light source into an electrical signal by spectroscopic and monochromatic light processing received through the optical fiber. And an amplifier including a preamplifier and a log amplifier to amplify and filter a signal output from the monochromatic light processing unit to a predetermined level, and to convert a nonlinear signal into a linear signal. Analog / Digital Converter (ADC, Analog / Dig) an ital converter) and a digital signal for controlling the monochromatic light processing unit according to a result of comparing the digital signal output from the analog / digital converter with a predetermined specific parameter value and converting and outputting the protocol to be compatible with a computer. A computer for displaying the spectral graph and the substance name through a display unit by calculating data received through the DSP and the digital signal processor by a set program, and databaseting a specific parameter value under the control of the computer. It consists of a database provided to.

Not limited to this, for example, the sorting means is configured to automatically remove the plastic material by the release of the air and the probe group consisting of the first to the third probe unit paired by five of the analyzer and the plurality of input optical fibers connected to the analyzer. A group of solenoid valves composed of first to third solenoid valve units connected to the air compressor and the air compressor and a plurality of conveyors for transporting plastic materials, and a plurality of conveyor motors connected to the air compressors. Conveyor motor unit consisting of a control unit (PCL) connected to the above-described components to perform the overall control of these, that is, a hopper (Hopper) for accommodating the plastic material and the plastic material freely falling from the hopper And are installed on the first to seventh conveyors and the second, fourth and sixth conveyors, respectively. The second, fourth, and sixth points at the point where the plastic material falls freely and falls by the operation of the first to third probe units and the second, fourth, and sixth conveyors for analyzing the type of plastic material being used. The first to third nozzle units respectively installed at the lower portion of the conveyor and the second, fourth, and sixth conveyors are installed so as to be perpendicular to the upper and lower parts of the first and third nozzle units, respectively. High pressure air is provided to the third and fifth and seventh conveyors and the first to third nozzle units which perform horizontal transfer of the plastic materials so that they can be collected in the collection container when the classification of the plastic materials is completed. And a first to fifteenth solenoid valve for controlling the air ejection of a plurality of nozzles provided between the supplying air compressor and the first to third nozzle units.

Referring to the operation state of the sorting means having such a configuration, the program processor of the control unit configured to control the analyzer and the analysis program processing unit constituting the analyzer and the probe group connected to the analyzer, that is, added to the first to third probe units An operation of a conveyor motor unit implemented with a plurality of lighting lamps, a plurality of motors for driving the pneumatics and the first to seventh conveyors, respectively, is disclosed.

At this time, the plastic material accommodated in the hopper is dropped freely and transported on the first conveyor, and then the plastic material is horizontally transported along the second conveyor to pass through the first probe unit.

At this time, five input-side optical fibers are equally spaced along the width of the conveyor belt of the second conveyor in the first probe unit, and an illumination lamp, which is a near-infrared light source passing through the input-side optical fiber, is incident on the plastic material and reflected. The reflected light is incident to the optical connection device configured inside the analyzer through the input side optical fiber, which is then input to the analysis program processor which is converted into a frequency conversion and a digital signal through a monochromatic light processing unit and implemented by a computer, thereby entering the reflected light information. Perform comparative analysis with a database containing data by materials and plastics.

As a result of the comparative analysis, when the reflected light information inputted by the plurality of input side optical fibers falls within the same or similar range as the data stored in the database, high pressure air may be emitted to the nozzle corresponding to the input side optical fiber side which has detected this. Since the solenoid valve is opened, the free fall material is blown to the first classifier so that the plastic material of the same type can be collected.

This operation principle is the same as the operating principle of the second and third probe units and the second and third nozzle units configured in the fourth and sixth conveyors.

Therefore, it is possible to allow plastic materials of different materials to be collected in the second and third sorting boxes, and such overall program control is processed by the control program processing unit constituting the control unit.

In addition, the wavelength range of the near-infrared ray used above is preferably 1 ~ 1.5㎛, in addition to the method using the near-infrared, drop the sample to the plastic material to be transported by the conveying conveyor to the plastic material for each material according to the reaction value Various sorting methods for sorting the sorting method and other plastic materials can be used by adopting a preferred method for automatically sorting, rather than sorting through the human eye.

And, the final transfer step (S40) is a step to be recycled by transporting to the reprocessing plant, etc. by shredding or packaging the plastic material stored in each collection according to the plastic type through the second classification step (S30), Each sorting means is provided in a plurality of conveyors, the plastic material to be conveyed to the conveyor is sorted by material, and then each sorted plastic material is transferred to a separate collection and stored, and shredded plastic material stored in the collection by material Or package it and transport it to a reprocessing plant.

Therefore, the various kinds of recycled materials collected in the first storage area are classified by non-plastic materials and plastic materials by the first worker, and among them are ordinary plastic materials, but they can be visually identified as PET, PE, PP, PS, ABS, etc. By accurately sorting countless plastic materials by means of sorting means and supplying them to the reprocessing plant, the reduction of defect rate due to the improvement of sorting reliability is minimized, thereby enhancing product competitiveness.

In addition, in the process of sorting the plastic material to remove the foreign matter stuck between the plastic material or attached to the surface completely, it is possible to minimize the defective rate of the product accordingly.

As described above, the recycled plastic sorting method according to a preferred embodiment of the present invention is automatically performed by a sorting method of manually identifying and classifying recycled plastic ashes manually with the naked eye of various recycled products collected by the conventional sorting method. Accurate sorting operation by sorting means improves the sorting reliability of plastic materials, restoring the sorting reliability of defect rate reduction when producing products such as recycling plants due to the mixing of different materials, and strengthening the product competitiveness due to waste of equipment and manpower As a result, the consumption of resources is minimized by inducing consumer consumption in competition between existing products and recycled products.

In addition, by the sorting means, a plurality of workers in each step are automatically harmed by the sorting means, without automatically causing a problem that the worker is contaminated by contaminants contained on the surface or inside of the recycled product through manual sorting. By performing the screening operation, there is an effect of improving the product competitiveness due to waste of labor and labor costs.

In addition, in the process of sorting only plastic materials among various recycled materials collected in a collection house, various foreign material removal means for completely removing other foreign materials other than plastic materials to restore the reliability of sorting plastic materials and to minimize the occurrence of product defects caused by foreign materials. It is effective.

Although described with reference to a preferred embodiment of the present invention as described above it is illustrative of the best embodiment of the present invention by way of example, not limiting of the invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (11)

Among the various recycled materials collected in the collection place, the non-plastic material and the large plastic material are classified into a separate storage box, and the collection and first classification step (S10), which is classified as other recycled plastic materials, A foreign material removal step (S20) of selecting and removing foreign matters contained in the recycled plastic material classified through the collection and first classification step (S10), A second sorting step (S30) of sorting the recycled plastic material from which the foreign matter is removed through the foreign material removing step (S20) for each material; Recycling plastics sorting method characterized in that formed in the transfer step (S40) for transferring the recycled plastic material classified by each material through the second sorting step (S30) to the recycling plant by a process such as processing or shredding. The method of claim 1, The foreign material removal step (S20) further comprises a metal material selection step (S210) for selecting and removing metal materials contained in the surface or the like among the classified recycled plastic materials by forming a separate magnetic force selection means. Plastic sorting method. The method of claim 1, In the foreign material removal step (S20), when the recycled plastic material is transferred to the next process, the recycled plastic material, which is degraded by the wind power of the wind means, is blown and transferred to the next process, and the foreign material of the heavy load is freely dropped to remove the foreign material. Recycling screening method characterized in that it further comprises a specific gravity screening step (S220). The method of claim 1, The foreign matter removal step (S20) is a recycling sorting method further comprises a rotary classification step (S230) for separating and removing the recycled plastic materials and foreign matter while rotating the recycled plastic materials by a separate rotation means. The method of claim 4, wherein The rotary sorting step (S230) is rotated through the rotating means and when sorting the recycling sorting method characterized in that the discharge direction according to the size of the recycled plastic material to be classified as medium, small. The method according to claim 4 or 5, Recycling plastics sorting method characterized in that the recycled plastic material to be rotated by the wind means in the rotation means of the rotary classification step (S230) is dried by the wind to facilitate the removal of foreign substances. The method of claim 6, Recycling plastic sorting method characterized in that the heating means is provided in the wind power means of the rotary classification step (S230) to dry the recycled plastic material by hot air. The method of claim 1, The foreign material removal step (S20) further comprises a non-metallic sorting step (S240) for selecting and removing a non-metallic material contained in a surface or the like among the classified recycled plastic materials by configuring a separate non-metallic sorting means. Recycling plastic sorting method. The method of claim 1, The second classification step (S30) is a compression sorting step (S310) for compressing and dropping the recycled plastic material from which the foreign matter is removed in the foreign matter removing step (S20) to a predetermined position, and predetermined through the compression sorting step (S310) Recycling plastic sorting method characterized in that it is formed by the plastic sorting step (S320) for sorting the recycled plastic material by material by the sorting means located in position. The method according to claim 1 or 9, The plastic sorting step (S320) is characterized in that the recycled plastic material is removed and the compressed recycled plastic material is transported through the multi-stage conveying conveyor, and the recycled plastics are sorted by material by the sorting means provided in each of the multi-stage conveying conveyors. Is a method of sorting recycled plastic. The method according to claim 1 or 9, In the second sorting step (S30), the sorting means for sorting the recycled plastic material is characterized in that it is selected by the material of the plastic material by spectroscopy of the reflected infrared light source by irradiating near-infrared light and then scanning by analyzing the infrared wavelength by wavelength Plastic sorting method.

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