KR102203443B1 - Apparatus and method for classfying mixture plastic waste - Google Patents

Abstract

The present invention is an apparatus including a sorting unit for classifying waste plastics, wherein the sorting unit is located in a transport unit for transporting the waste plastic in one direction, a heating unit for melting the waste plastic at a predetermined first temperature, and the transport unit. It includes a cooling unit that cools the molten waste plastic to a second temperature lower than the first temperature and separates it from the transfer unit, and includes a heating step, a precooling step, a first cooling step, a second cooling step, and a delivery step. According to the present invention, only waste plastics with a relatively low melting point can be selectively melted, cooled, and separated through the heating unit, so that mixing of other waste plastics can be prevented, and sequential classification of waste plastics by melting point is possible. In addition, the efficiency and accuracy of the classification process can be maximized.

Description

Classification apparatus and method of mixed waste plastics TECHNICAL FIELD [APPARATUS AND METHOD FOR CLASSFYING MIXTURE PLASTIC WASTE}

The present invention relates to an apparatus and a method for classifying mixed waste plastics. In more detail, when a plurality of waste plastics having different melting points from each other are mixed, it relates to an apparatus and method for easily classifying each material by sorting them by melting point.

Plastic is a polymer compound produced by molding by applying heat and pressure. Plastics as described above are provided in various ways for each use and material, for example, polyethylene terephthalate (PET) used in wire coverings, household goods, packaging, etc., obtained by catalytic polymerization of propylene, and used in bottles and containers. Many types of plastics, such as propylene (PP, Polyethylene), packaging materials, and polyethylene (PE) used for insulators, are generally used materials. However, the plastics described above are difficult to decompose, do not rot for a long time, and are difficult to recycle through landfill or combustion because harmful substances are generated during combustion.

In order to solve such a problem, Prior Document 1 (Korean Patent Publication No. 10-2005-0017280) describes a method for recycling plastic through processes such as adding commercial fire and rice husk powder to the mixed waste plastic. Started. However, in the case of Prior Document 1, the result of recycling is limited to plate materials, and since additives such as the commercial fire and rice husk powder must be used, the unit price is increased. In addition, since Prior Literature 1 uses a method of regenerating plastics as they are without sorting them, the necessity of separately separating plastics mixed with a plurality of materials and performing treatments such as recycling has been continuously emerging.

In addition, Prior Document 2 (Republic of Korea Patent Registration No. 10-1556228) discloses a device for classifying mixed plastics by material using a spectroscope, but in this case, it is impossible to sort out pieces of plastic that are difficult to distinguish even with a spectroscope. Separate processes and devices are required for selectively sorting, and thus the efficiency of sorting is extremely reduced.

In addition, Prior Document 3 (Korea Patent Registration No. 10-1236205) discloses a device that induces easy separation through a magnetic separator, a rotating brush, and a blower, but the separation inducing means as described above completely separates the mixed waste plastics. There is a problem that it cannot be performed.

In addition, Prior Document 4 (Republic of Korea Patent Registration No. 10-1459345) selects waste plastics using the difference in specific gravity, but in this case, the mixed waste plastics have a specific gravity of 0.91 g/cc, PP, 0.95 g/cc. Since HDPE (high density polyethylene) having a specific gravity, polyethylene terephthalate having a specific gravity of 1.39 g/cc, and polycarbonate having a specific gravity of 1.22 g/cc are mixed and provided, it is difficult to separate plastics by material due to the difference in specific gravity.

In addition, since the mixed plastics as described above have relatively high molecular weight and viscosity, they are pressed during heating and post-treatment is difficult. In addition, when heat is applied to the extent that all of the mixed plastics are melted, classification is not possible, and therefore, there is a need to develop an apparatus and a classification method capable of easily classifying them.

Prior Document 1: Korean Patent Application Publication No. 10-2005-0017280 (published on February 22, 2005) Prior Document 2: Korean Patent Registration No. 10-1556228 (registered on September 22, 2015) Prior Document 3: Korean Patent Registration No. 10-1236205 (registered on February 18, 2013) Prior Document 4: Korean Patent Registration No. 10-1459345 (registered on November 3, 2014)

The technical object of the present invention is to provide an apparatus and method capable of easily classifying waste plastics having different melting points.

In addition, the present invention is to provide an apparatus and method capable of minimizing the generation of harmful substances during the classification process of mixed waste plastics.

In addition, an object of the present invention is to minimize operator intervention in the process of classifying mixed waste plastics by material.

To this end, the present invention is an apparatus comprising a first sorting part and a second sorting part located in the other direction of the first sorting part, the first sorting part a first conveying part and a first conveying part for conveying waste plastic located on the surface in the other direction. It includes a first heating unit located inside the conveying unit and heating the waste plastic by setting the surface temperature of the first conveying unit to a preset first temperature, and the surface temperature of the second conveying unit is controlled through the second heating unit in the second separator. The waste plastic provided at a second temperature higher than the first temperature and having a melting point lower than the first temperature is melted and attached to the first conveying part, and the waste plastic having a melting point higher than the first temperature is moved to the second conveying part. Accordingly, it provides a device for sorting waste plastics by melting point.

According to the present invention, through the first heating unit and the second heating unit provided at a first temperature and a temperature higher than the first temperature, the first transfer unit and the second transfer unit have a first temperature and a second temperature, so that the melting point Only waste plastics lower than the first temperature and the second temperature may be selectively melted, cooled, and separated.

In addition, according to the present invention, by separately collecting and reheating the waste plastic that has not been melted in the first sorting part through the second heating part, it is possible to sequentially classify the waste plastics by melting point, so that the classification process efficiency and Accuracy can be maximized.

1 is a view showing the whole of the mixed waste plastic sorting apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a first classification unit according to an embodiment of the present invention.
3 is a diagram illustrating a second classification unit according to an embodiment of the present invention.
4 is a view showing a first transfer unit and a second transfer unit according to another embodiment of the present invention.
5 is a view showing a first transfer unit and a first heating unit according to an embodiment of the present invention.
6 is a view showing melting and adhesion of waste plastic by a first transfer unit according to an embodiment of the present invention.
7 is a view showing the movement of the molten waste plastic and the movement of the unmelted waste plastic according to an embodiment of the present invention, respectively.
8 is a flowchart showing an overall method of classifying mixed waste plastics according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments disclosed below. In addition, parts irrelevant to the present invention are omitted in the drawings in order to clearly disclose the present invention, and the same or similar reference numerals denote the same or similar components in the drawings.

Objects and effects of the present invention may be naturally understood or more clearly understood by the following description, and the objects and effects of the present invention are not limited only by the following description.

Objects, features and advantages of the present invention will become more apparent through the following detailed description. In addition, in describing the present invention, when it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Prior to explaining the present invention in detail, waste plastic (m) is used and collected separately PE (m1), PP (m2), ABS resin (m3), polycarbonate (m4), PET (m5), polystyrene (m6), etc. refers to a mixture of plastics. That is, the mixed waste plastic (m) means a mixture of waste plastics having a plurality of materials, and in the case of the mixed waste plastic (m) in the present invention, PE (m1) is 130 °C, PP (m2) is 160 °C, ABS Resin (m3) refers to an aggregate of plastics having different melting points of 170°C, polycarbonate (m4) at 250°C, PET (m5) at 260°C, and polystyrene (m6) at 270°C. Here, the waste plastic (m) is pulverized and dried through a separate pretreatment unit and provided in a solid state.

In addition, the other direction in the present invention is the waste plastic into which the first classification unit 100, the second classification unit 200, the third classification unit, the fourth classification unit, the fifth classification unit, and the sixth classification unit to be described later ( m) as a transport direction, which means the upper right direction of FIG. 3 and the right direction of FIG. 4, and one direction is the first classification unit 100 and the second classification unit 200, the third classification unit, and the fourth classification unit. As a direction in which the first transfer unit 110, the second transfer unit 210, the third transfer unit, the fourth transfer unit, the fifth transfer unit and the sixth transfer unit are provided, respectively, provided in the unit, the fifth classification unit, and the sixth classification unit, It means the opposite direction to the other side.

Hereinafter, descriptions of the first classification unit 100 to the sixth classification unit in the present invention will be described only with the first classification unit 100 and the second classification unit 200, and the third to sixth classification units The configuration and operation of the first classification unit 100 and the second classification unit 200 are the same, and a detailed description thereof will be omitted.

In addition, the outer direction and the inner direction in the present invention are based on the first classification unit 100 and the second classification unit 200. In detail, the outer direction means a direction from the inside of the first classification unit 100 and the second classification unit 200 to the outside, and the inner direction is the first classification unit 100 and the second classification unit 200 It is a direction from the outside to the inside, which means the opposite direction to the outside direction.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a view showing the whole of the mixed waste plastic (m) classification apparatus according to an embodiment of the present invention.

The apparatus for classifying the mixed waste plastics m according to the present invention includes a first classifying unit 100 and a second classifying unit 200.

The first sorting unit 100 is a component for primary sorting the mixed waste plastic m in which plastics having different melting points are mixed. To this end, the first classification unit 100 includes a first transfer unit 110, a first heating unit 120, a cooling unit 600, and a storage unit 700. In addition, the first sorting unit 100 is to determine whether the melting point of the waste plastic (m) seated on the first transfer unit 110 heated to a predetermined first temperature (t1) through the first heating unit 120. According to the selection and melting, the unmelted waste plastic (m) is moved to the second sorting unit 200 to be described later to perform the same sorting and melting operation.

The second sorting part 200 is melted through the first conveying part 110 and the first heating part 120 in the above-described first sorting part 100, and the remaining waste plastics (m ) To perform the melting operation. To this end, the second classification unit 200 includes a second transfer unit 210, a second heating unit 220, a cooling unit 600, and a storage unit 700. Here, the above-described configuration of the cooling unit 600 and the storage unit 700 is the same configuration provided in each of the first classification unit 100 and the second classification unit 200, and the reference numbers in the present invention are unified Please write.

As a more preferred embodiment, the height of the first sorting part 100 (meaning the height in the upward direction from the ground when installed on the ground) may be provided to be greater than the height of the second sorting part 200. This is to induce easier transport of the waste plastic (m) from the first transfer unit 110 to the second transfer unit 210 to be described later. Additionally, the third to sixth classification units are formed to be arranged in the other direction, and are provided at a gradually lower height as described above.

In another embodiment of the present invention, the first classification unit 100 and the second classification unit 200 are provided with a spray unit 400 and a water cooling unit 500 to be described later to easily remove the waste plastic (m). It can be formed into a T to separate. However, the shape of the first sorting part 100 and the second sorting part 200 is not limited thereto, and may be provided as a conventional conveyor.

FIG. 2 is a view showing a first classification unit 100 according to an embodiment of the present invention, and FIG. 5 is a view showing a first transfer unit 110 and a first heating unit 120 according to an embodiment of the present invention. It is a drawing.

The first sorting unit 100 is a mixed waste place?? It is provided for the purpose of sorting and separating waste plastics (m) with the lowest melting point among them. To this end, the first classification unit 100 includes a first transfer unit 110, a first heating unit 120, a cooling unit 600, and a storage unit 700. Here, the configuration of the cooling unit 600 and the storage unit 700 overlapping with the internal configuration of the second classification unit 200 will be described later in FIGS. 8 and 9.

The first transfer unit 110 is configured to heat the waste plastic (m) while at the same time. In detail, the first transfer unit 110 simultaneously carries out transportation and sorting of the waste plastic (m). To this end, the first transfer unit 110 is provided as a transfer means such as a conveyor. As a more preferred embodiment, the first transfer unit 110 may be provided as a metal conveyor of a hinged stainless top chain that is not deteriorated and damaged when heated by the first heating unit 120 to be described later, and facilitates heat transfer. have. Therefore, it is possible to maximize the thermal efficiency related to surface temperature setting through the first heating unit 120. On the other hand, the mixed waste plastic (m) is located in the upper direction of the first transfer unit 110 heated to a first temperature (t1) with a surface temperature set in advance through the first heating unit 120, the first temperature (t1) The first conveying unit 110 having a heated surface selectively melts the waste plastic m in the process of moving the mixed waste plastic m in the other direction. In detail, among the mixed waste plastics (m), the melting point of the waste plastics (m) whose melting point is lower than the first temperature (t1) is melted on the first conveying part 110, and the melted waste plastics (m1) is the first conveying part (110). ) Is adhered to the surface. On the other hand, the waste plastics (m2 to m6) having a melting point greater than the first temperature t1 are not melted and move in the other direction while maintaining a solid state along the first conveying unit 110. Through this, the first transfer unit 110 can easily melt the waste plastic (m) by melting point without a separate sorting means, which has the effect of maximizing the sorting accuracy and efficiency of the waste plastic (m).

The first heating unit 120 is a means for heating the above-described first transfer unit 110. In detail, the first heating unit 120 heats the surface temperature of the first transfer unit 110 to a preset first temperature t1, and ultimately, the waste plastic located on the surface of the first transfer unit 110 ( m) is selectively melted to adhere to the surface. To this end, the first heating unit 120 is located inside the first transfer unit 110. In detail, the first heating unit 120 is provided as a heating means such as a heating wire, a coil, a hot air fan, a far-infrared ray, a microwave, and an induction current method, and is provided inside the first transfer unit 110, and the first heating unit 120 By performing heat transfer toward the first heating unit 120 located in the outer direction of the first transfer unit 110, the surface of the first transfer unit 110 is set to be at a first temperature t1. Here, the fact that the first heating unit 120 is positioned in the inner direction of the first transfer unit 110 has an effect of remarkably increasing thermal efficiency compared to that provided in the outer direction of the first transfer unit 110. In detail, when the first heating unit 120 is located outside the first transfer unit 110, the thermal energy radiated from the first heating unit 120 does not move toward the first transfer unit 110 and indiscriminately Move. Therefore, the present invention can derive an effect of minimizing the loss of heat energy compared to a conventional conveyor dryer.

The waste plastic (m1) melted through the first conveying unit 110 as described above is melted on the first heating unit 120 of the first conveying unit 110, converted into a sticky liquid, and attached to the first conveying unit. It moves along (110), and since the temperature around the molten waste plastic (m1) is naturally lowered than the first temperature (t1) in this process, the waste plastic (m1) solidifies again to solidify and a cooling unit (to be described later) ( 600) coagulate through composition. Accordingly, the solidified waste plastic (m1) can be easily separated from the first transfer unit 110, it is possible to easily complete the selection. Meanwhile, the configuration of the first heating unit 120 described above may be provided in the same manner in the second transfer unit 210 to the sixth heating unit to be described later.

3 is a diagram illustrating a second classification unit 200 according to an embodiment of the present invention.

The second classification unit 200 is configured to re-classify the waste plastic m that has not been melted and classified in the first classification unit 100. In detail, the melting point is higher than the preset first temperature t1, so that the waste plastic m that does not melt on the first conveying unit 110 and maintains a solid state is a second plastic that is located in the other direction of the first sorting unit 100. It is dropped and moved to the classification unit 200 to be reclassified. A more detailed description of this will be described later in FIG. 7. Meanwhile, the second classification unit 200 includes a second transfer unit 210 and a second heating unit 220 having the same configuration as the first classification unit 100.

The second transfer unit 210 is heated by the second heating unit 220 to reheat and melt the waste plastic m. In detail, the second transfer unit 210 receives and melts the remaining unmelted waste plastic m from the first transfer unit 110. To this end, the second transfer unit 210 is located in the other direction of the first transfer unit 110. In detail, one end of the second transfer unit 210 facing one direction is located in the other direction than the other end facing the other direction of the first transfer unit 110, but is located in the lower direction of the first transfer unit 110. Through this, the remaining waste plastic (m) that is not attached to the first transfer unit 110 is released from contact at the other end of the first transfer unit 110 and falls downward, and falls in the lower direction of the first transfer unit 110. It is automatically transferred from the located second transfer unit 210 to be moved and melted in the other direction. Accordingly, it is possible to omit a separate delivery means for supplying the waste plastic m from the first transfer unit 110 to the second transfer unit 210, thereby realizing miniaturization and simplification of the sorting apparatus.

The second heating unit 220 is provided for the purpose of re-melting the waste plastic on the surface of the second transfer unit 210 by heating the above-described second transfer unit 210. In detail, the second heating unit 220 has a function of reheating and reselecting the waste plastic m on the second iso unit. To this end, the second heating unit 220 is provided with the same heating means as the first heating unit 120, and transfers heat toward the second transfer unit 210 located in the outer direction, thereby the second heating unit 220 Heat the surface of the. As a more preferred embodiment, the second heating unit 220 may be provided at a second temperature t2 higher than the first temperature t1 described above. In detail, since the second temperature t2 is provided at a temperature higher than the first temperature t1, it is possible to easily sort the waste plastic m on the surface of the second transfer unit 210. For example, PE (m1) contained in the mixed waste plastic (m) is 130 degrees Celsius, PP (m2) is 160 degrees Celsius, ABS resin (m3) is 170 degrees Celsius, and polycarbonate (m4) is 250 degrees Celsius. , PET (m5) has a melting temperature of 260 degrees Celsius, polystyrene (m6) has a melting temperature of 270 degrees Celsius, respectively, and the first temperature (t1) is higher than the melting temperature of PE (m1) and lower than the melting temperature of PP (m2) That is, when provided with 130 degrees Celsius to 160 degrees Celsius, only PE(m1) is selectively melted and classified in the first classification unit 100. In addition, when the second temperature t2 is higher than the melting temperature of PP (m2) and lower than the melting temperature of the ABS resin (m3), that is, 160 degrees Celsius to 170 degrees Celsius, the second classification unit 200 Only PP (m2) is selectively melted and attached to the second transfer unit 210, and ABS resin (m3), polycarbonate (m4), PET (m5) and polystyrene (m6) having a melting point higher than the second temperature (t2) are It does not melt, maintains a solid state, and moves in the other direction. That is, the waste plastics (m2 to m6) that are not melted in the first conveying unit 110 move in the other direction on the second conveying unit 210 and are located in the other direction of the second sorting unit 200. It is further sorted and melted in the sorting section. Through the above-described configuration and selection process, since it is possible to selectively melt and classify the waste plastics (m) in the order of the lowest melting point among the mixed waste plastics (m), compared with a conventional spectrometer or a classification device using a specific gravity difference. The accuracy can be remarkably improved.

4 is a view showing a first transfer unit 110 and a second transfer unit 210 according to another embodiment of the present invention.

As another embodiment of the present invention, the first transfer unit 110 ′ may move along the first classification unit 100 ′. In addition, the second transfer unit 210 ′ may be provided in a rod shape and provided in plurality, and may be spaced apart at a predetermined interval. In addition, an adsorption unit 300 may be further provided in the inner direction of the second transfer unit 210 ′ as described above.

The adsorption unit 300 prevents scattering of the waste plastic m located on the second transfer unit 210 ′, and prevents the molten waste plastic m from being attached to the second transfer unit 210 ′ more easily. It is a configuration that assists to maintain. To this end, the adsorption unit 300 is located in the inner direction of the second transfer unit 210 ′. In addition, the adsorption unit 300 is provided as a suction means such as an adsorber for sucking air. Here, air may be sucked between the second conveying parts 210 ′ formed of a plurality of rods, so that scattering of the waste plastic m may be more effectively prevented.

6 is a view showing the melting and adhesion of the waste plastic (m) by the first transfer unit 110 according to an embodiment of the present invention, Figure 7 is a melted waste plastic (m) according to an embodiment of the present invention ) Is a diagram showing the movement and the movement of the unmelted waste plastic (m), respectively.

Prior to describing the melting, adhesion, and classification of the waste plastic (m) through FIGS. 6 and 7, the mixed waste plastic (m) is limited to FIGS. 6 and 7 as the first plastic (m1) and the second plastic ( m2), the third plastic (m3) and the fourth plastic (m4) will be described as an example. In detail, the first plastic m1 has a melting point that is less than the first temperature t1, which is the surface temperature of the first conveying unit 110, and the melting point of the second plastic m2 is less than the first temperature t1. It is provided to be larger than the second temperature t2 which is the surface temperature of the second transfer unit 210.

6, the first plastic (m1) and the second plastic (m2), which are different materials on the surface of the first transfer unit 110, are moved in the other direction, and at the same time, in the inner direction of the first transfer unit 110 It is heated by the located first heating unit 120. In detail, the surface of the first transfer unit 110 is uniformly heated to a first temperature t1 by the first heating unit 120, and the first plastic (m1) and the second plastic (m2) are the first transfer unit. In the process of moving from (110) to the other side, the melting point is melted in the order of low. In detail, since the melting point of the first plastic m1 is smaller than the surface temperature (first temperature t1) of the first conveying unit 110, it is melted on the first conveying unit 110, and has viscosity when melting. Due to the characteristics of the plastic, it is adhered to the first transfer unit 110. Accordingly, the first plastic m1 is moved in the other direction in the molten state.

On the other hand, the second plastic m2 has a melting point higher than the surface temperature (first temperature t1) of the first transfer unit 110. Accordingly, the second plastic m2 is not melted on the first transfer unit 110 and continuously maintains the injected solid state. Therefore, the second plastic (m2) is located on the first transfer unit 110, but is not adhered.

The third plastic (m3) and the fourth plastic (m4) have a melting point higher than that of the second plastic (m2), which is higher than the surface temperature of the second transfer unit 210 by the second heating unit 220. It is provided so that it is. Therefore, the third plastic (m3) and the fourth plastic (m4) are not melted on the surface of the second transfer unit 210 after moving from the first transfer unit 110 to the second transfer unit 210 and maintain a solid state. While moving in the other direction, it moves to the third transfer unit and the fourth transfer unit, and is selectively melted.

Referring to FIG. 7, the first transfer unit 110 moves in the other direction along the first sorting unit 100 and then returns and moves in one direction. Here, the first plastic m1 that continuously maintains the attached state with the first transfer unit 110 due to viscosity moves in one direction integrally with the first transfer unit 110.

On the other hand, since the second plastic (m2) is not adhered to the first conveying unit 110 and is only seated, the first conveying unit () when the first conveying unit 110 returns from the other end of the first sorting unit 100 ( It is separated from 110) and falls to the second classification unit 200 located in the downward direction. The second plastic m2 is moved and heated again in the other direction along the second splitter 200 to be melted.

Through the above process, mixed waste plastics (m) having different melting points can be easily classified. In addition, since the melting point of plastic is clearly classified and provided for each material, the present invention can significantly improve classification accuracy as compared to the prior art using visual screening and screening using a difference in specific gravity. In addition, the present invention has an effect of reducing the waste of manpower and fatigue of the operator since it is possible to omit the visual screening of the operator after the plastic is selected. On the other hand, the molten waste plastic (m) returned in one direction along the first transfer unit 110 as described above is solidified through the injection unit 400 and water cooling unit 500 to be described later, and from the first transfer unit 110 It is collected separately.

As another embodiment of the present invention, the injection unit 400 and the water cooling unit 500 may be further provided. The injection unit 400 is configured to separate the molten waste plastic m from the first transfer unit 110 and the second transfer unit 210. In detail, the injection unit 400 separates the waste plastic (m) attached by being melted by the first transfer unit 110 and the second transfer unit 210 from the first transfer unit 110 and the second transfer unit 210 It is provided for the purpose of. To this end, the injection unit 400 is provided in the shape of a roller and is located inside the first transfer unit 110 and the second transfer unit 210. In addition, the injection unit 400 receives fluid through a separate fluid supply unit and injects the fluid in an outward direction. Here, as the injection unit 400 is disposed at the lower end of the first transfer unit 110 and the second transfer unit 210 formed in a T-shape, the lower side of the first classification unit 100 and the second classification unit 200 It is possible to easily spray the fluid toward the first transfer unit 110 and the second transfer unit 210 located in the direction. By being provided with the injection unit 400, the molten waste plastic (m) adhered to and attached to the first transfer unit 110 and the second transfer unit 210, respectively, is cooled and solidified, and the first transfer unit 110 and the second transfer unit ( 210) can be easily separated. Therefore, it is not necessary to place a separate separation device such as a scratcher on the surfaces of the first transfer unit 110 and the second transfer unit 210, thus miniaturization and simplification of the classification device can be achieved, and the first transfer unit 110 and the second transfer unit It is possible to prevent damage such as scratches from occurring in the 210, and thus durability can be remarkably increased.

As a more preferred embodiment, the mixed plastics sorting apparatus according to the present invention may further include a water cooling unit 500. The water cooling unit 500 is configured to cool the waste plastic (m). In detail, the water cooling unit 500 cools the waste plastic m that is melted and bonded by the first transfer unit 110 and the second transfer unit 210 to change to a solid state. To this end, the water cooling unit 500 is located in the downward direction of the first transfer unit 110 and the second transfer unit 210. As a more preferred embodiment, when the first classification unit 100 and the second classification unit 200 are formed in a T-shape, the water cooling unit 500 is the first classification unit 100 and the second classification unit 200 It is located in the downward direction of the bottom of ). In addition, the water cooling unit 500 is formed so that the upper surface thereof is opened, and cooling water having a third temperature t3 lower than the aforementioned first temperature t1 and the second temperature t2 is accommodated therein.

The lower ends of the injection unit 400 and the first transfer unit 110 and the second transfer unit 210 located in the outer direction of the injection unit 400 are located inside the water cooling unit 500. In detail, the injection unit 400 is disposed so as to be immersed in the cooling water having a third temperature t3 as it is located inside the water cooling unit 500 with an open top surface. Accordingly, the injection unit 400 injects a fluid toward the first transfer unit 110 and the second transfer unit 210 while submerged in the cooling water, and in this process, the molten waste solidified by the cooling water in the water cooling unit 500 The plastic m is separated from the surfaces of the first transfer unit 110 and the second transfer unit 210 by fluid in a solid state. Through the configuration of the injection unit 400 and the water cooling unit 500 as described above, the molten waste plastic m can be easily separated from the first transfer unit 110 and the second transfer unit 210.

The mixed plastics sorting apparatus according to the present invention further includes a cooling unit 600 and a storage unit 700 configuration.

The cooling unit 600 adds waste plastic (m) remaining on the surfaces of the first transfer unit 110 and the second transfer unit 210 despite passing through the aforementioned injection unit 400 and water cooling unit 500 It is a configuration that cools and separates. To this end, the cooling unit 600 is located inside the first transfer unit 110 and the second transfer unit 210. In detail, the cooling unit 600 is provided in a downward direction of the first transfer unit 110 and the second transfer unit 210 and is installed inside the first transfer unit 110 and the second transfer unit 210. In addition, the cooling unit 600 has a preset fourth temperature and sets the surface temperatures of the first transfer unit 110 and the second transfer unit 210 to a fourth temperature, where the fourth temperature is the aforementioned third temperature ( It is provided at a temperature lower than t3). Accordingly, the cooling unit 600 is not solidified in the spraying unit 400 and the water cooling unit 500, and thus the waste plastic (m) continuously attached to the surfaces of the first and second conveying units 110 and 210 The waste plastic m remaining in the first transfer unit 110 and the second transfer unit 210 may be completely separated and removed by solidifying by cooling to a lower temperature. Meanwhile, the waste plastic (m) separated from the first transfer unit 110 and the second transfer unit 210 through the cooling unit 600 is stored in the lower direction of the first transfer unit 110 and the second transfer unit 210 It descends toward the part 700 and is collected.

8 is a flow chart showing the overall classification method of the mixed waste plastic (m) according to an embodiment of the present invention.

The classification method according to an embodiment of the present invention is a method of classifying mixed waste plastics (m) having different melting points as described above, and a heating step, a melting step, a precooling step, a first separation step, a second separation step, It includes a transfer step and a reheat step.

The heating step is a step of heating the first conveying unit 110 before melting the waste plastic m. Specifically, the heating step is a pre-treatment step of the melting step for heating and melting the waste plastic m through the first heating unit 120 and the first transfer unit 110. To this end, the first heating unit 120 located inside the first splitting unit 100 raises and maintains the surface temperature of the first transfer unit 110 to a first temperature t1.

The melting step is a step of heating and melting the waste plastic (m) in earnest. To this end, the first transfer unit 110 having a surface temperature of the first temperature t1 in the melting step heats the mixed waste plastic m located on the surface to the first temperature t1, and in this process, the melting point The waste plastic m lower than the first temperature t1 is melted on the first conveying unit 110. Here, the waste plastic (m) is attached so as to stick to the first transfer unit 110 by viscosity generated during melting. On the other hand, when the melting point is higher than the first temperature t1, the waste plastic m is located on the surface of the first transfer unit 110 when the solid state is maintained.

The pre-cooling step is a step of air-cooling the molten and solid waste plastics (m). To this end, the first transfer unit 110 moves the waste plastic m in the other direction.

The first separation step has the purpose of separating from the first transfer unit 110 by cooling and solidifying the waste plastic (m) attached to the first transfer unit 110 by the viscosity generated by melting. To this end, the injection unit 400 provided by being submerged in the coolant having a third temperature t3 in the water cooling unit 500 in the first separation step transfers the fluid toward the first transfer unit 110 and the second transfer unit 210. By spraying, the waste plastic (m) is solidified and separated.

The second separation step is a step for completely separating the waste plastic m remaining on the surfaces of the first transfer unit 110 and the second transfer unit 210 in the first separation step. To this end, in the second separation step, the cooling unit 600 cools the surfaces of the first transfer unit 110 and the second transfer unit 210 to a fourth temperature lower than the third temperature t3. Accordingly, the waste plastic (m) is separated from the surfaces of the first transfer unit 110 and the second transfer unit 210.

The transfer step is a step of moving the unmelted waste plastic m to the second sorting unit 200 through the first transfer unit 110 after the preliminary cooling step. To this end, the second sorting part 200 is located in the other direction of the first sorting part 100, and the solid waste plastic m is the second sorting part 200 at the other end of the first sorting part 100. It falls to one end of.

The reheating step is a step of reheating and melting the solid waste plastic (m) moved to the second fractionating unit 200. To this end, in the reheating step, the second heating unit 220 heats the second transfer unit 210 to a second temperature t2 higher than the first temperature t1 described above, so that the surface of the second transfer unit 210 is It is kept constant at the second temperature t2. Accordingly, the waste plastic (m) on the second transfer unit 210 is heated again, and in this process, the waste plastic (m) having a melting point lower than the second temperature (t2) is selected to melt and the second transfer unit 210 Adhered to the surface of the Thereafter, the above-described pre-cooling step, the first separation step, and the second separation step are sequentially performed.

Through a series of configurations and processes as described above, waste plastics (m) having different melting points can be easily classified by material, but classification accuracy can be remarkably improved. In addition, it is possible to minimize equipment-related costs since it is not necessary to use a separate transportation means in the process of moving the waste plastic m.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art with ordinary knowledge of the present invention will be able to make various modifications, changes and additions within the spirit and scope of the present invention, such modifications, changes and additions Should be seen as falling within the scope of the above claims.

If a person of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible within the scope of the technical spirit of the present invention, so that the present invention is described in the foregoing embodiments and the accompanying drawings. Is not limited by.

In the exemplary system described above, the methods are described on the basis of a flowchart as a series of steps or blocks, but the present invention is not limited to the order of the steps, and certain steps may occur in a different order or concurrently with the steps described above. I can. In addition, those skilled in the art will appreciate that the steps shown in the flowchart are not exclusive, other steps may be included, or one or more steps in the flowchart may be deleted without affecting the scope of the present invention.

100: first classification unit 110: first transfer unit
120: first heating unit 200: second classification unit
210: second transfer unit 220: second heating unit
300: adsorption unit 600: storage unit

Claims (6)

A device including a first classification unit 100 and a second classification unit 200 located in the other direction of the first classification unit 100,
The first classification unit 100,
A first transfer unit 110 for transporting the waste plastic located on the surface in the other direction; And
A first heating unit 120 located inside the first transfer unit 110 and heating the waste plastic by setting the surface temperature of the first transfer unit 110 to a preset first temperature t1; and ,
The surface temperature of the second transfer unit 210 is provided at a second temperature t2 higher than the first temperature t1 through the second heating unit 220 in the second classification unit 200,
The waste plastic having a melting point lower than the first temperature t1 is melted and attached to the first transfer unit 110,
As the waste plastic having a melting point higher than the first temperature t1 moves to the second conveying unit 210, the waste plastic is sorted by melting point,
The first transfer unit 110 and the second transfer unit 210 are provided with a plurality of hinged stainless steel saw chains,
By further comprising an adsorption unit 300 respectively positioned in the inner direction of the second transfer unit 210 and adsorbing and fixing the waste plastic, the scattering of the waste plastic is prevented, and the molten waste plastic uses the adhesive force to prevent the first It is located on the classification unit 100 and the second classification unit 200,
Water cooling to solidify the waste plastic melt-adhered to the first and second separators 100 and 200 by receiving cooling water in the downward direction of the first and second separators 100 and 200 A portion 500 is further provided, and the waste plastic melted and adhered on the first and second classification units 100 and 200 is immersed in the water cooling unit 500 and solidified to thereby reduce the waste plastic. Separation apparatus for mixed waste plastics, characterized in that separating from the first classification unit 100 and the second classification unit 200.
delete delete delete The method of claim 1,
The first heating unit 120 and the second heating unit 220 are classified as one of heating means such as a heating coil, a heating wire, a hot fan, a far infrared ray, a microwave, an induced current method, and the like.
delete

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