JP7217560B1 - Foreign matter removal equipment for waste plastic - Google Patents

Abstract

The object of the present invention is to reliably remove stainless steel foreign matter and weakly magnetic foreign matter mixed in waste plastic, and supply aluminum vapor-deposited or aluminum foil-coated bags to the recycling process together with general plastic bags without removing them. To provide a waste plastic foreign matter removing device capable of Kind Code: A1 A waste plastic foreign matter removing apparatus for removing foreign matter mixed in waste plastic including a plastic bag coated with aluminum vapor deposition or aluminum foil in a pre-stage of a waste plastic recycling process, and conveying the waste plastic. X-ray equipment consisting of a conveying path, an X-ray source that irradiates X-rays onto the waste plastic being conveyed on the conveying path, and a line sensor that receives the irradiated X-rays; A foreign matter detection unit that detects foreign matter and weakly magnetic foreign matter, and a foreign matter removal unit that removes the stainless foreign matter and weakly magnetic foreign matter detected by the foreign matter detection unit from the conveying path. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a foreign matter removing apparatus for waste plastic used for removing foreign matter such as metal powder from waste plastic such as collected used plastic bags.

Plastics used for food packaging are collected as waste plastics after disposal and reused as raw materials for fuel and plastic products. In such recycling, waste plastics are cut and crushed, then formed into pellets by a granulator, and used as raw materials for fuel and plastic products. Among the waste plastics are candy bags coated with aluminum vapor deposition or aluminum foil. Bags coated with aluminum vapor deposition or aluminum foil can be sent directly to the plastic recycling process, but if they pass through a metal detector, they will be separated and removed as metal, making it impossible to reuse them.

On the other hand, in separate collection before reuse, metal scraps such as iron and stainless steel, and foreign matter such as pebbles are mixed with the waste plastic regardless of whether it is inside or outside. If the pellets are sent to the recycling process with this foreign matter mixed in, not only will the pulverizer and granulator be damaged, but also inconveniences such as reduced pellet combustion efficiency and breakdown of the combustion device will occur. , iron and stainless steel foreign matter must be removed. In this case, it is preferable from the point of view of resource utilization that the waste plastic bags coated with aluminum vapor deposition or aluminum foil be sent to the recycling process together with general waste plastic bags.

Patent Literatures 1 and 2 disclose foreign matter inspection apparatuses for detecting foreign matter such as metal mixed in an aluminum vapor-deposited plastic bag as a product. This contaminant inspection device consists of a metal detector that detects contaminants by turbulence in the magnetic field formed by a coil, and an X-ray detector that irradiates X-rays and detects contaminants based on the X-ray data emitted. Detects mixed foreign matter.

These foreign matter detectors are required to detect foreign matter in the bag without detecting aluminum vapor-deposited plastic bags as foreign matter, and control for this purpose is required. For this reason, for example, in Patent Document 1, when metal detection is performed, it is determined whether or not the detected metal is contained in the bag, and when it is determined that the detected metal is contained in the bag, the concentration region is determined. A region suitable for metal detection is set, and if it is determined that the metal is not contained in the bag, the density region is set to a region suitable for foreign matter detection other than metal. Therefore, in a structure using both a metal detector and an X-ray detector, there is a problem that the control for foreign matter detection is complicated and the structure is complicated.

The foreign matter detectors of Patent Documents 1 and 2 are devices for detecting foreign matter inside aluminum vapor-deposited plastic bags that flow in a food production line, and are different from those that target separately collected waste plastic bags for inspection. . The shape, size, weight, etc. of the aluminum vapor-deposited plastic bags that flow on the production line are well-defined to some extent, and it is possible to detect foreign matter based on a certain range of inspection data. On the other hand, sorted and collected waste plastic bags have various shapes, sizes, and weights, and there are many types of foreign matter, which causes large variations in inspection data. Therefore, the foreign matter detectors of Patent Documents 1 and 2 cannot be used to detect foreign matter in waste plastic collected separately.

Patent Literature 3 discloses a waste plastic sorting device comprising a magnetic sorting device and a wind sorting device. After removing foreign matter such as iron with a magnetic sorting device, the plastic is separated into high-density plastic and light-weight aluminum-deposited confectionery bags by wind power. Since the aluminum-deposited confectionery bags do not react to the magnetic force of the magnetic force sorting device, they can be sent to the subsequent recycling process without being removed. However, since non-magnetic materials such as stones and stainless steel do not respond to magnetic force, they cannot be separated by the magnetic force sorting device. For this reason, these hard materials are mixed in the waste plastic, and there is a risk that the crusher, the granulator, etc., will be damaged if they are reused. In order to prevent this, a manual sorting process is required.

JP 2008-268035 A JP 2018-40640 A JP 2007-105582 A

The present invention has been made in consideration of the above-mentioned problems, and since foreign substances including stainless steel and weak magnetic substances cannot be removed by a magnetic sorter, these foreign substances mixed in waste plastic can be easily removed. To provide a foreign matter removing apparatus for waste plastics capable of surely removing waste plastic bags coated with aluminum vapor deposition or aluminum foil, and supplying the waste plastic bags together with general plastic bags to a recycling process without removing the waste plastic bags. .

An apparatus for removing foreign matter from waste plastic according to the present invention is an apparatus for removing foreign matter from waste plastic, which removes foreign matter mixed in waste plastic, including plastic bags coated with aluminum or aluminum foil, in a pre-process of recycling the waste plastic. an X-ray device comprising a transport path for transporting the waste plastics, an X-ray source for irradiating the waste plastics being transported on the transport path with X-rays, and a line sensor for receiving the irradiated X-rays; A foreign matter detection unit for detecting stainless foreign matter and weakly magnetic foreign matter based on image data of the line sensor; The X-ray device is housed in a box that covers and isolates the X-ray source and the line sensor from the surroundings, and the box has an opening that can be inserted into an existing transport path. It is characterized in that the waste plastic including the aluminum vapor-deposited or aluminum foil-coated plastic bag is supplied to the recycling process.

The waste plastic is supplied by a conveyor belt, and a magnet roll is provided at one end of the conveyor belt. It is characterized by being arranged.

The line sensor is characterized by being a dual line sensor comprising a first line sensor for receiving high-energy X-rays and a second line sensor for receiving low-energy X-rays.

The box is provided with a line sensor height adjusting member for adjusting a height position of the line sensor with respect to the conveying path.

The box body is provided with a detour roller for avoiding interference between the conveying path and the line sensor when running, and a detour roller height adjusting member for adjusting the height position of the detour roller. It is characterized by

According to the waste plastic foreign matter removing apparatus of the present invention, the foreign matter detection unit detects stainless foreign matter and weakly magnetic foreign matter based on the imaging data of the line sensor. Since foreign matter and weakly magnetic foreign matter are removed from the conveying path, damage to the crusher can be prevented. On the other hand, since waste plastic including plastic bags coated with aluminum vapor deposition or aluminum foil is not removed from the transport path, it can be reused together with waste plastic such as general plastic bags, enabling effective utilization of resources. becomes.

A waste plastic is supplied by a conveying belt equipped with a magnet roll, and a magnetic foreign matter removing means for removing magnetic foreign matter by the magnetic force of the magnet roll is arranged upstream of the conveying path of the X-ray apparatus. It is possible to reduce the load of removing metallic foreign matter.

The line sensor is a dual line sensor consisting of a first line sensor that receives high-energy X-rays and a second line sensor that receives low-energy X-rays. Since the object can be identified and the material can be identified, removal can be performed more reliably than determination based on the density of the image with a single line sensor.

Since the X-ray device is housed in the box and the box has an opening that can be inserted into the existing transport path, the box can be moved toward the transport path and the X-ray system can be easily attached to the existing transport path. can be inserted.

Since a line sensor height adjusting member for adjusting the height position of the line sensor is provided on the box body, the line sensor can be prevented from colliding with the belt of the conveying path, and the X-ray device can be easily inserted into the existing conveying path. can be done.

The box is provided with detour rollers for avoiding interference between the conveying path and the line sensor when running, and a detour roller height adjusting member for adjusting the height position of the detouring rollers. By partially changing the running height of the belt and widening the belt interval, the line sensor of the X-ray device can be easily inserted into the existing conveying path.

1 is a structural diagram of an apparatus for removing foreign matter from waste plastics according to the present invention; FIG. It is a figure which shows the example of waste plastic. It is a flow of processing of a foreign object detection unit equipped with a dual line sensor. 1 is a front view of an X-ray device; FIG. It is a right view of an X-ray apparatus. FIG. 4 is a front view of a state in which the X-ray device is inserted into an existing transport path; Example 1 FIG. 4 is a front view of a state in which the X-ray device is inserted into an existing transport path; Example 2 FIG. 4 is a front view of a state in which the X-ray device is inserted into an existing transport path; Example 3 FIG. 4 is a front view of a state in which the X-ray device is inserted into an existing transport path; Example 4 FIG. 4 is a front view of a state in which the X-ray device is inserted into an existing transport path; Example 5 FIG. 4 is an explanatory diagram of a height adjusting member for a line sensor and bypass rollers; This is an example in which an X-ray device is provided at a location where the conveyor crosses.

The present invention removes foreign matter from waste plastic that has been discarded in general life and then separately collected, and is used to remove foreign matter in the preceding stage of the recycling process of the separately collected waste plastic. In particular, the present invention detects and removes non-magnetic stainless steel foreign matter and weakly magnetic foreign matter mixed in waste plastic, and does not remove waste plastic bags coated with aluminum vapor deposition or aluminum foil. It is a device that can be supplied to the recycling process together with general plastic bags.

Non-magnetic stainless steel foreign matter to be removed by the present invention is austenitic stainless steel represented by SUS304, SUS316, and SUS316L, and objects such as bolts, nuts, screws, container lids, and other parts that have been discarded. . Foreign matter containing weak magnetic materials includes parts such as pumice stones, paint scum mixed with rust, and pellets and chips in which small parts such as needles and nails are embedded. Other foreign objects such as stones, glass, bolts and nails are removed. SUS304, SUS316, and SUS316L stainless steels have no magnetism when new. However, when rubbed, weak magnetism appears. Even weak magnetism cannot be completely removed by a magnetic sorter, so it is sorted by a sorter equipped with X-rays.

Hereinafter, a foreign matter removing apparatus for waste plastics according to the present invention will be described with reference to the drawings.

FIG. 1 is a structural diagram of an apparatus 100 for removing foreign matter from waste plastics according to the present invention. The foreign matter removing apparatus 100 for waste plastics includes a conveying path 1 of a belt conveyor, an X-ray device 2 having an X-ray source 5 and a line sensor 9 for capturing an X-ray image, and determining whether or not foreign matter is present based on X-ray imaging data. and a foreign object removing unit 4 made up of a sorting plate. Objects determined to be foreign matter by the foreign matter detection unit 3 are collected in the foreign matter collection box 11 . As shown in FIG. 1, the waste plastic 6 is thrown into the conveying path 1, conveyed from left to right, imaged by the X-ray device 2, and the objects determined as foreign matter by the foreign matter detector 3 are The removing unit 4 rotates to collect the foreign matter in the foreign matter collection box 11 . In the present invention, the waste plastics include plastic bags coated with aluminum vapor deposition or aluminum foil, and the plastic bags coated with aluminum vapor deposition or aluminum foil are collected in the foreign matter collection box 11 as described later. It is supplied to the recycling process by the transport path 1 together with other plastics.

The X-ray source 5 consists of a filament (cathode) 7 and a target (anode) 8, and simultaneously generates high-energy X-rays and low-energy X-rays. An object of waste plastic 6 is imaged by a line sensor 9 . The line sensor 9 can be a single line sensor or a dual line sensor 9a. When a single line sensor is used, since the waste plastic 6 is a lightweight waste plastic, it is transparent and has a light shadow. The dual line sensor 9a consists of a first line sensor for obtaining a high energy X-ray image (m) and a second line sensor for obtaining a low energy X-ray image (h). Since the difference (h−m) between the two images differs depending on the object, the material can be identified from this value. More reliable classification can be achieved than in the case of judging an object only by the shading of the image. The foreign matter detection unit 3 is a part that determines whether or not the target object is a foreign matter based on the density of the captured image. The X-ray apparatus 2 particularly wants to remove foreign matter 12 of non-magnetic stainless steel and foreign matter 13 of weak magnetic material. An example of the weakly magnetic foreign matter 13 is pumice stone. The reason why attention is paid to these foreign substances is that iron foreign substances can be removed in advance by a magnetic force sorter, but non-magnetic stainless steel foreign substances 12 and weakly magnetic foreign substances 13 cannot be removed by a magnetic force sorter. There are many examples of this being done. In general, objects that can be removed with the X-ray device 2 include iron, stainless steel, copper, aluminum, stone, and glass.

FIG. 2 is a diagram showing an example of the waste plastic 6. As shown in FIG. The foreign matter includes a foreign matter 12 made of stainless steel and a foreign matter 13 made of weak magnetic material. The stainless foreign matter 12 includes metal objects using nonmagnetic SUS303, SUS304, SUS316L, and the like. The weakly magnetic foreign matter 13 includes pumice stone. Examples of the waste plastic 6 include a plastic wrap sheet 14, a confectionery bag (aluminum deposition or with aluminum foil) 15, a confectionery bag (aluminum deposition or without aluminum foil) 16, a plastic tray 17, and the like. An aluminum vapor deposition or aluminum foil is indicated by reference numeral 15a. FIG. 2 shows a case where a confectionery bag 16 (with no aluminum vapor deposition or aluminum foil) contains a foreign substance 12 made of stainless steel. In such a case, even if the inside of the confectionery bag cannot be seen from the outside, the foreign matter 12 made of stainless steel can be imaged by X-ray imaging. That is, the stainless steel foreign matter 12 is detected whether it is outside or inside the confectionery bag (aluminum deposition or with aluminum foil) 15 .

Iron foreign matter 22, such as bolts and nuts, can be detected by X-rays. 10 were placed. The magnetic foreign matter removing means 10 is supplied with the waste plastic 6 by a conveying belt 22 having a magnet roll 21 at one end, and the magnetic foreign matter is removed by the magnetic force of the magnet roll 21 . The magnet roll 21 is composed of permanent magnets, and removes the attracted bolts and nuts by dropping them below the conveyor belt 22 . It should be noted that it is difficult to remove weakly magnetic foreign matter even if a strong magnet roll 21 is prepared.

FIG. 3 shows the processing flow of the foreign object detection unit 3 having the dual line sensor 9a. m1 to m5 are images of the object in FIG. 2 taken with low-energy X-rays. h1 to h5 are images of the object in FIG. 2 taken with high-energy X-rays. Since low-energy X-rays have a weak penetrating power, for example, when plastic is irradiated, an image with deep shadows is obtained, whereas high-energy X-rays have a strong penetrating power, so an image with light shadows is obtained. The difference between the shades of the two images, that is, the difference in the amount of transmitted light is calculated, and it is checked whether the difference matches the previously known material. If they match, the material is specified.

As shown in FIG. 3 , when the foreign matter detection unit 3 determines that the object is a stainless foreign matter 12 , the sorting plate of the foreign matter removal unit 4 operates to collect the foreign matter in the foreign matter collection box 11 . When a confectionery bag (aluminum-deposited or without aluminum foil) 16 contains a stainless foreign matter 12, the confectionery bag 16 and the stainless foreign matter 12 are collected together in the confectionery collection box 11 by the foreign matter removal unit 4 operating. Even if the stainless foreign matter 12 is outside the candy bag 16, the candy bag 16 and the stainless foreign matter 12 are collected in the foreign matter recovery box 11.例文帳に追加A nickel-cadmium battery and a lithium battery are examples of the stainless foreign matter 12 . If the case is made of stainless steel and mixed with the waste plastic 6, it may ignite in a post-process, and should be removed as a foreign matter.

As shown in FIG. 3, the confectionery bag 15 (with vapor-deposited aluminum or aluminum foil) has no thickness, but since it is metal, the amount of transmitted light is a little low and there is a shadow. process. In other words, vapor-deposited aluminum or aluminum foil is judged not to be a foreign matter on the basis that it does not damage the grinder. Therefore, the confectionery bag 15 is thrown into the transport path 1 for reuse in the latter stage. The confectionery bag 15 is pulverized and dissolved in a solvent in a subsequent recycling process to separate the aluminum and recover the plastic. The wrap sheet 14 and the plastic tray 17 are also thrown into the transport path 1 for reuse in the latter stage. The pull tab of an aluminum can is determined to be a foreign object because the density is different from the shadow of the confectionery bag (aluminum deposition or aluminum foil) 15 .

FIG. 4 is a front view of the X-ray device 2. FIG. The X-ray device 2 consists of a box 23 . The X-ray device 2 is configured to be insertable into an existing transport path (belt conveyor) 1 . A touch display 24 and an operation panel 25 are provided on the front of the box 23, and a patrol lamp 26 and a buzzer (not shown) are provided on the roof to inform an abnormal state of the device. Casters 27 for facilitating movement of the box 2 and level feet 28 for floating the casters 27 are provided at the bottom. At the left end of the conveying path (belt conveyor) 1, there are a foreign matter removal section 4 and a foreign matter recovery box 11 (not shown).

FIG. 5 is a right side view of the X-ray device 2. FIG. FIG. 5 shows a state in which the back cover covering the rear and the protective covers covering the left and right sides are opened. In this state, the opening 29 of the box 23 is open. The internal line sensor 9 is positioned near the center of the opening 29 . Line sensor 9 is shown as a single line sensor. According to this, the box 23 can be moved rearward and the X-ray apparatus 2 can be inserted or inserted into the conveying path (belt conveyor) 1 . The existing conveying path (belt conveyor) 1 in the inserted state is indicated by the one-dot chain line in FIG. As shown in FIG. 5, the X-ray source 5 is located above the box 23 and radiates downward. The light is irradiated so as to cover the width of the conveying path (belt conveyor) 1 . An image processing PC 30 installed at the bottom of the box 23 analyzes the X-ray captured image. The image processing PC 30 corresponds to the foreign object detector 3 in FIG.

FIG. 6 is a front view of the state in which the X-ray device 2 is inserted into the existing transport path (belt conveyor) 1 in the first embodiment. The transport path (conveyor belt) 1 is shown inside the box 23 but visible. FIG. 6 shows an example in which the line sensor 9 is inserted between the upper belt 1a and the lower belt 1b of the existing conveying path (belt conveyor) 1. FIG. An image processing PC 30 installed at the bottom of the box 23 analyzes the X-ray captured image.

FIG. 7 is a front view of the state in which the X-ray device 2 is inserted into the existing transport path (belt conveyor) 1 in the second embodiment. The transport path (conveyor belt) 1 is shown inside the box 23 but visible. In FIG. 7, the line sensor 9 is inserted into the space of the conveying path (belt conveyor) 1 widened by the detour rollers 31 . Since the detour roller 31 pushes down the lower belt 1b to expand the space between it and the upper belt 1a, the line sensor 9 can be easily inserted into the conveying path (belt conveyor) 1 by moving the box 23. - 特許庁

FIG. 8 is a front view of the state in which the X-ray device 2 is inserted into the existing transport path (belt conveyor) 1 in the third embodiment. Since the detour roller 31 pushes up the upper belt 1a to expand the space between it and the lower belt 1b, the line sensor 9 can be easily inserted into the conveying path (belt conveyor) 1 by moving the box 23. - 特許庁That is, the X-ray device 2 can be easily inserted into the conveying path (belt conveyor) 1 .

FIG. 9 is a front view of the state in which the X-ray device 2 is inserted into the existing transport path (belt conveyor) 1 in the fourth embodiment. The line sensor 9 is positioned above the upper belt 1a of the conveying path (belt conveyor) 1, and the transfer plate 32 is arranged above the line sensor 9. That is, the line sensor 9 is arranged inside the transfer plate 32 . Since the waste plastic 6 placed on the transfer plate 32 is not conveyed, an air blower 33 is provided to blow it forward. A heavy metal piece or the like that is difficult to move forward with the blower 33 is detected by a sensor, a patrol lamp 26 is turned on, and a buzzer is sounded.

FIG. 10 is a front view of the state in which the X-ray device 2 is inserted into the existing transport path (belt conveyor) 1 in the fifth embodiment. The line sensor 9 was positioned above the upper belt 1a of the conveying path (belt conveyor) 1, and the upper belt 1a pushed down the upper belt 1a with the detour roller 31. A substantially horizontal transfer plate 32 is arranged above the line sensor 9. - 特許庁Since the waste plastic 6 placed on the transfer plate 32 is not conveyed, an air blower 33 is provided to blow it forward. A heavy metal piece or the like that is difficult to move with the blower 33 is detected by a sensor, the patrol lamp 26 is turned on, and a buzzer is sounded.

11A and 11B are explanatory diagrams of the height adjusting member 40 of the line sensor 9 and the height adjusting member 41 of the bypass roller 31. FIG. Both the height adjusting member 40 and the height adjusting member 41 are provided with a slit 35 in the L-shaped support, one end or both ends of the line sensor 9 and the detour roller 31 are vertically movably passed through the slit 35, and the height adjusting screw 34 is It is fixed with The detour roller 31 is preferably rotatable. It is not limited to such a configuration, and a ball screw may be used to enable accurate height adjustment.

FIG. 12 shows an example in which an X-ray device 2 is provided at a location crossing a conveyor. The X-ray device 2 can be installed at a location where the first conveying path and the second conveying path cross over the conveyors. Since the space in the height direction is smaller than when the X-ray apparatus 2 is installed at a horizontal portion of the transport path, a step is required on the floor. Since it takes time to move the sorting plate after the detection of the foreign object, the height must be suitable for this time. The X-ray device 2 is installed horizontally.

According to this embodiment, it is possible to reliably remove non-magnetic stainless foreign substances (such as spoons, knives, nails, etc.) mixed in with waste plastic that are difficult to remove with a magnetic sorter, and to remove plastic bags made of aluminum vapor deposition or aluminum foil. It is suitable as an apparatus for removing foreign matter from waste plastics that can be sent to the recycling process without waste plastics.

1 Conveyor path (belt conveyor)
2 X-ray device 3 Foreign matter detector 4 Foreign matter remover (sorting plate)
5 X-ray source 6 Waste plastic (object)
7 filament (cathode)
8 target (anode)
9 Line sensor 9a Dual sensor 10 Magnetic foreign matter removing means 11 Foreign matter recovery box 12 Stainless foreign matter 13 Weakly magnetic foreign matter 14 Wrap sheet 15 Confectionery bag (aluminum vapor deposition or aluminum foil available)
15a aluminum vapor deposition or aluminum foil 16 candy bag (without aluminum vapor deposition or aluminum foil)
17 plastic tray 20 transport belt 21 magnet roll
22 Iron foreign objects (bolts, nuts, etc.)
23 box 24 touch display 25 operation panel 26 patrol lamp 27 caster 28 level foot 29 opening 30 image processing PC
31 Detour roller 32 Transfer plate 33 Blower 34 Height adjustment screw 35 Slit 40 Line sensor height adjustment member 41 Detour roller height adjustment member 100 Waste plastic foreign matter removal device m1 to m5 Low energy X-ray image h1 to h5 High energy x-ray image

Claims (5)

A waste plastic foreign matter removing apparatus for removing foreign matter mixed in waste plastic including a plastic bag coated with aluminum vapor deposition or aluminum foil in a pre-stage of a recycling process of the waste plastic,
a transport path for transporting the waste plastic;
an X-ray device comprising an X-ray source for irradiating X-rays onto the waste plastic being conveyed on the conveying path, and a line sensor for receiving the irradiated X-rays;
a foreign matter detection unit that detects stainless foreign matter and weakly magnetic foreign matter based on the imaging data of the line sensor;
a foreign matter removing unit that removes stainless steel foreign matter and weakly magnetic foreign matter detected by the foreign matter detection unit from the conveying path,
The X-ray device is housed in a box that covers and isolates the X-ray source and the line sensor from the surroundings, and the box is provided with an opening that can be inserted into an existing transport path,
An apparatus for removing foreign substances from waste plastics, wherein the waste plastics including the plastic bag coated with aluminum vapor deposition or aluminum foil is supplied to the recycling process. The waste plastic is supplied by a conveyor belt, and a magnet roll is provided at one end of the conveyor belt. 2. The apparatus for removing foreign matter from waste plastics according to claim 1, wherein the foreign matter removing apparatus is arranged. 3. The line sensor according to claim 1, wherein said line sensor is a dual line sensor comprising a first line sensor for receiving high-energy X-rays and a second line sensor for receiving low-energy X-rays. waste plastic foreign matter removal equipment. 2. The device for removing foreign matter from waste plastics according to claim 1 , wherein the box is provided with a line sensor height adjusting member for adjusting a height position of the line sensor with respect to the conveying path. The box body is provided with a detour roller for avoiding interference between the conveying path and the line sensor when running, and a detour roller height adjusting member for adjusting the height position of the detour roller. 2. The apparatus for removing foreign matter from waste plastic according to claim 1, wherein

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