JP2021128063A - Material determination device for waste plastic - Google Patents

Abstract

To provide a material determination device for waste plastic with which a calibration plate for spectrum correction can be easily installed and removed and a spectrum for correction can be easily acquired.SOLUTION: A material determination device for waste plastic 1 comprises: a preprocessing unit 51 that corrects a spectrum of reflected light of light with which a conveyance path 3 of a conveyor 2 is irradiated by a light unit 10, the spectrum detected by a mid-infrared camera 4, by using a first spectrum for correction measured in a condition where the reflected light is bright and a second spectrum for correction measured in a condition where the reflected light is dark; a determination unit 52 that determines the material of a waste plastic piece by using the spectrum corrected by the preprocessing unit 51; and an arm unit 14 that moves a calibration plate 11 for acquiring the first and second spectra for correction between a predetermined reference position and a position on the conveyance path 3 irradiated by the lighting unit 10.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to a material determination device for waste plastic.

In the reprocessing of waste plastics, in order to recycle materials, it is required that the products after sorting are less mixed with non-objects and have high purity. Further, when the material contains an expensive material, it is required that the expensive material can be sorted without omission. In addition, it is required to efficiently discriminate and sort black plastics, which have had to be thermally recycled because they cannot be separated in the past, in order to recycle the materials.

In Patent Document 1, the object to be sorted is irradiated with infrared light to receive the reflected light from the object to be sorted, and the resin type of the object to be sorted is determined by a pattern matching method using a spectrum based on the reflected light. It is stated that.

JP-A-2018-100903

By the way, in the material discrimination method based on the spectrum described in Patent Document 1 and the like, the characteristics of the spectrum fluctuate depending on the temperature, aging deterioration, measurement position, etc. Therefore, for example, a white and black calibration plate is installed at the measurement position for correction. The spectrum for is calculated, and the spectrum is corrected using these correction spectra.

However, in such a correction spectrum acquisition work, it is necessary to sequentially install the calibration plate at the irradiation position on the conveyor and remove it after the data acquisition.

An object of the present disclosure is to provide a waste plastic material determination device capable of easily installing and removing a calibration plate for spectrum correction and easily acquiring a correction spectrum.

The waste plastic material determination device according to one aspect of the embodiment of the present invention receives an irradiation unit that irradiates a waste plastic piece conveyed on a transport path with light and a reflected light of the light emitted by the irradiation unit. The reflection spectrum detection unit that detects the spectrum of the reflected light, and the spectrum detected by the reflection spectrum detection unit are measured under the conditions where the reflected light is the brightest, the first spectrum, and the darkest conditions. A pretreatment unit that corrects using two spectra, a determination unit that determines the material of the waste plastic piece using the spectrum corrected by the pretreatment unit, and the first spectrum and the second spectrum are acquired. A calibration plate for this purpose is provided with a moving portion that moves between a predetermined reference position and an irradiation position on the transport path by the irradiation portion.

According to the present disclosure, it is possible to provide a waste plastic material determination device capable of easily installing and removing a calibration plate for correcting a spectrum and easily acquiring a correction spectrum.

A perspective view showing a schematic configuration of a waste plastic material determination device according to an embodiment. Side view of the waste plastic material determination device shown in FIG. Top view of the waste plastic material determination device shown in FIG. Functional block diagram of the discriminator Flowchart of material discrimination process of waste plastic according to the embodiment The figure which shows the extraction method of the spectrum for correction The figure which shows an example of the operation screen of the material judgment apparatus

Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same components are designated by the same reference numerals as much as possible in each drawing, and duplicate description is omitted.

In the following description, the x-direction, the y-direction, and the z-direction are perpendicular to each other. The x-direction and the y-direction are horizontal directions, and the z-direction is a vertical direction. The x direction is the transport direction of the transport path 3 of the conveyor 2. The y direction is the width direction of the transport path 3 of the conveyor 2. Further, in the following, for convenience of explanation, the z positive direction side may be expressed as the upper side and the z negative direction side may be expressed as the lower side.

A schematic configuration of the waste plastic material determination device 1 according to the embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a schematic configuration of a waste plastic material determination device 1 according to an embodiment. FIG. 2 is a side view of the waste plastic material determination device 1 shown in FIG. FIG. 3 is a plan view of the waste plastic material determination device 1 shown in FIG. Here, a configuration is illustrated in which the waste plastic to be determined as a material is a black waste plastic, and two types of materials S1 and S2 (indicated by quadrangular and triangular marks in FIGS. 1 to 3) are mixed. explain. In the following, the black waste plastic pieces of the two types of materials S1 and S2 may be collectively represented by the reference numeral S.

The black waste plastic material determination device 1 conveys a vibration feeder 8 as an example of a supply unit that sequentially supplies black waste plastic pieces S1 and S2, and black waste plastic pieces S1 and S2 supplied by the vibration feeder 8. A conveyor 2 as an example of a transport unit is provided as a main unit. The crushed black waste plastic pieces S1 and S2 are supplied to the vibration feeder 8 via, for example, a charging hopper. The vibration feeder 8 supplies the black waste plastic pieces S1 and S2 to the conveyor 2 while preventing the black waste plastic pieces S1 and S2 from being overlapped with each other by vibrating the mounting surface on which the black waste plastic pieces S1 and S2 are placed. The conveyor 2 has a transport path 3 on its upper surface, and transports the black waste plastic pieces S1 and S2 on the transport path 3 in a direction away from the vibration feeder 8.

Further, the material determination device 1 is an example of an illumination 10 as an example of an irradiation unit that irradiates the black waste plastic pieces S1 and S2 with infrared rays, and an example of a reflection spectrum detection unit that detects the reflection spectrum from the black waste plastic pieces S1 and S2. The main part is a mid-infrared camera 4 as a main part, and a discriminating device 5 for identifying the materials of the black waste plastic pieces S1 and S2 based on the reflection spectrum detected by the mid-infrared camera 4. The illumination 10 has a lamp 10A (see FIG. 6) which is an infrared light source such as a halogen tungsten lamp, and irradiates infrared rays from the lamp 10A toward the black waste plastic pieces S1 and S2. Further, the illumination 10 is installed on the mid-infrared camera 4 so that the reflected light from the black waste plastic pieces S1 and S2 enters the mid-infrared camera 4, and the upper both sides (or the upper one side) of the conveyor 2 in the flow direction with respect to the mid-infrared camera 4. ) Is installed.

As shown in FIG. 1, for example, one mid-infrared camera 4 can measure the entire width direction of the conveyor 2, and is divided into a plurality of (for example, 318) regions along the width direction and is black. The reflected light of near infrared rays from the waste plastic pieces S1 and S2 can be received, and the spectrum of the reflected light can be measured for each region. The mid-infrared camera 4 is composed of, for example, a camera with a spectroscope having a wavelength region of mid-infrared of 3 μm or more. The mid-infrared camera 4 measures at a scan frequency of, for example, 230 Hz, and transmits 318 spectral data to the discriminating device 5 for each scan. The discrimination device 5 outputs the material determination results of the 318 regions to the injection control unit 6, which will be described later, based on the 318 spectral data received from the mid-infrared camera 4.

Further, the material determination device 1 is provided with an injection nozzle 7 that injects air laterally or diagonally in a direction intersecting the transport direction on the downstream side of the conveyor 2 in the transport direction. A plurality of injection nozzles 7 (for example, 318) are arranged side by side in the width direction of the conveyor 2, and the operation of each nozzle is controlled by the injection control unit 6. The injection control unit 6 injects or does not inject air from the injection nozzle 7 according to the material determination result received from the determination device 5, so that, for example, a plurality of regions (for example, a recovery hopper) classified by the partition plate 9 are formed. Black waste plastic pieces S1 and S2 are sorted and dropped to collect waste plastic of a desired material. That is, in the present embodiment, the injection control unit 6, the injection nozzle 7, and the partition plate 9 are made of a desired material from the waste plastic piece flowing through the transport path 3 of the conveyor 2 based on the material determination result by the discrimination device 5. It functions as a collecting device 12 for collecting things.

The operation of the material determination device 1 will be described. For example, when the crushed black waste plastic pieces S1 and S2 are supplied to the vibration feeder 8 via a charging hopper or the like, the vibration feeder 8 gives weight to the supplied black waste plastic pieces S1 and S2 while applying vibration. It is conveyed downstream so as not to become a container, and is supplied to the conveyor 2.

The black waste plastic pieces S1 and S2 supplied to the transport path 3 on the upper surface of the conveyor 2 are transported in the transport direction on the x positive direction side, and are infrared from the illumination 10 at a position where the mid-infrared camera 4 can image. Light is emitted. The mid-infrared camera 4 receives the light reflected by the black waste plastic pieces S1 and S2 of the infrared rays emitted from the illumination 10, and outputs the light receiving result (data of the light receiving spectrum) to the discriminating device 5.

The discriminating device 5 identifies the materials of the black waste plastic pieces S1 and S2 based on the light receiving result input from the mid-infrared camera 4. The details of the material determination method by the determination device 5 will be described later with reference to FIGS. 4 to 9. The discrimination device 5 outputs the material identification result to the injection control unit 6.

The injection control unit 6 selects an injection nozzle 7 according to the material from among the plurality of injection nozzles 7 arranged, measures the timing, and transmits the control signal. The injection nozzle 7 that has received the control signal opens the nozzle opening and injects air. By injecting air from the injection nozzle 7 at an appropriate timing according to the discrimination result of the discrimination device 5, the material to be sorted and the material not to be sorted can be separated and collected.

In the examples of FIGS. 2 and 3, the black waste plastic piece S1 on the conveyor 2 receives air from the air injection nozzle 7 that has received the control signal, is blown off by the collecting device 12 provided for each material, and falls. Will be recovered. Further, since the black waste plastic piece S2 on the conveyor 2 does not receive air from the injection nozzle 7, it is collected by a collecting device 12 different from the black waste plastic piece S1. By injecting and stopping the injection nozzle 7 in this way, black waste plastic pieces made of a plurality of materials can be sorted and collected for each material.

FIG. 7 is a diagram showing an example of an operation screen of the material determination device 1. The operation screen shown in FIG. 7 is displayed on, for example, a display device installed in the main body of the material determination device 1. As shown in FIG. 7, the material names of the plastics to be sorted are listed on the operation screen, and the first system (“primary” in FIG. 7 and the second system (“secondary” in FIG. 7”) are listed. ), The material to be jetted and sorted can be individually selected. The display device on which the operation screen is displayed is, for example, a touch panel, and by an operation such as pressing the "OFF" display in the "spray selection" column. By switching to the "ON" display, it is possible to set the injection nozzle 7 to inject air and separate it by the collecting device in the case of the material (ABS in FIG. 7). In addition, on the operation screen, "input raw material area ratio". It is also possible to provide a column and display the ratio of each material mixed with the material according to the judgment result of the material judgment process.

FIG. 4 is a functional block diagram of the discrimination device 5. As shown in FIG. 4, the discrimination device 5 includes a pretreatment unit 51 and a determination unit 52.

The pretreatment unit 51 performs pretreatment such as correction and processing of the reflection spectra of the black waste plastic pieces S1 and S2 detected by the mid-infrared camera 4. The preprocessing unit 51 corrects the detected reflection spectrum by using, for example, a spectrum measured under a bright condition and a spectrum measured under a dark condition. The "dark condition" means a condition that is relatively darker than the above-mentioned "bright condition".

The determination unit 52 determines the materials S1 and S2 of the waste plastic piece S using the spectrum corrected by the pretreatment unit 51. The determination unit 52 can estimate the correspondence between the spectrum and the material by using an arbitrary method such as known pattern matching or a machine learning algorithm.

The discriminating device 5 is physically configured as a computer system including a CPU (Central Processing Unit), a main storage device such as a RAM (Random Access Memory) and a ROM (Read Only Memory), a communication module, and an auxiliary storage device. can do. Each function of the discriminating device 5 shown in FIG. 4 operates various hardware under the control of the CPU by causing a CPU, RAM, or the like to read predetermined computer software, and reads and writes data in the RAM. It is realized by doing. That is, by executing the material determination program according to the present embodiment on the computer, the determination device 5 functions as the preprocessing unit 51 and the determination unit 52 in FIG.

The discriminating device 5 may be a circuit composed of an analog circuit, a digital circuit, or an analog / digital mixed circuit. Further, a control circuit for controlling each function of the discriminating device 5 may be provided. The implementation of each circuit may be by ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array) or the like.

Similarly, the injection control unit 6 can also be physically configured as a computer system including a CPU, RAM and ROM, a communication module, an auxiliary storage device, and the like, and loads predetermined computer software into the CPU, RAM, and the like. The function is realized by making it.

FIG. 5 is a flowchart of the material discrimination process of the waste plastic according to the embodiment. Each process of the flowchart shown in FIG. 5 is executed by the discriminating device 5.

In step S01, the preprocessing unit 51 _{acquires the spectrum S org} (n, w) taken by the mid-infrared camera 4. Here, n is the number of sensors (the number of spectrum detection regions divided in the width direction of the conveyor 2 by the mid-infrared camera 4), and when the number of sensors is 318, 0 to 317 corresponding to each detection region. An integer is used. w is the wavelength of the spectrum, and in the present embodiment, a total of 131 wavelengths are set between 2700 (nm) and 5300 (nm) in increments of 20 (nm), and an integer of 0 to 130 corresponding to each wavelength is set. Is used. That is, S _org (n, w) represents the numerical value of the intensity of the spectrum of the wavelength w in the nth spectrum detection region along the width direction of the conveyor 2.

In step S02, the preprocessing unit 51 _{corrects the spectrum S org} (n, w) _{acquired in step S01, and calculates the corrected spectrum S cor} (n, w). Due to this correction, the spectrum due to the influence of changes in the concentration of water vapor and carbon dioxide in the measurement space, the temperature of the black waste plastic pieces S1 and S2 to be measured, the aging deterioration of the illumination 10 and the mid-infrared camera 4, the position on the conveyor 2, and the like. It can absorb the difference in strength characteristics. The corrected spectrum S _cor (n, w) can be calculated by, for example, the following equation (1).

ここで、W_ref（ｎ，ｗ）は、反射光が明るい条件で計測した第１の補正用スペクトルである。D_ref（ｎ，ｗ）は、反射光が上記の明るい条件よりも暗い条件で計測した第２の補正用スペクトルである。これらの補正用スペクトルW_ref（ｎ，ｗ）、D_ref（ｎ，ｗ）は、例えば、材質判別処理を実行する前に中赤外線カメラ４の校正を行うときに抽出できる。

Here, W _ref (n, w) is the first correction spectrum measured under the condition that the reflected light is bright. D _ref (n, w) is a second correction spectrum measured under a condition in which the reflected light is darker than the above-mentioned bright condition. These correction spectra W _ref (n, w) and D _ref (n, w) can be extracted, for example, when the mid-infrared camera 4 is calibrated before the material discrimination process is executed.

FIG. 6 is a diagram showing an extraction method _{of spectra W ref} (n, w) and D _{ref (n, w) for correction.} As shown in FIG. 6, a calibration plate 11 for acquiring a correction spectrum is installed in the imaging region of the mid-infrared camera 4 on the transport path 3 of the conveyor 2, and the spectrum of the reflected light by the mid-infrared camera 4 is provided. By detecting, the spectra W _ref (n, w) and D _ref (n, w) for correction can be obtained.

_{In the case of the first correction spectrum W ref} (n, w) (first spectrum) measured under conditions where the reflected light is bright, a calibration plate 11 (aluminum, stainless steel, etc.) that reflects all wavelengths in the mid-infrared region is placed. With the illumination 10 turned on, all wavelengths (w = 0 (2700), 2 (2720), ..., 130 (5300)) for all sensors (n = 0, 1, 2, ..., 317). )) Get the data.

_{In the case of the second correction spectrum D ref} (n, w) (second spectrum) measured under conditions where the reflected light is dark, a calibration plate 11 (aluminum, stainless steel, etc.) that reflects all wavelengths in the mid-infrared region is placed. With the light 10 turned off (or with the camera shutter closed), all wavelengths (w = 0 (2700), 2 () for all sensors (n = 0, 1, 2, ..., 317) 2720), ..., 130 (5300)) data are acquired.

_{The calibration plate 11 is arranged when acquiring the correction spectra W ref} (n, w) and D _ref (n, w), as shown by the dotted line arrows in FIG. 6, for example, the transport path of the conveyor 2. It is preferable that the image is movably installed between the position of the imaging region of the mid-infrared camera 4 and the standby position outside the imaging region of the mid-infrared camera 4 and the irradiation range of the illumination 10. In other words, the calibration plate 11 can be fixed at a predetermined position in the field of view of the mid-infrared camera 4 and a predetermined position outside the field of view, and is preferably movable between both predetermined positions. The surface roughness of the calibration plate 11 is set to about 3.2a to 6.3a of JIS B 0601-2001 standard so that halation does not occur in the mid-infrared camera 4 due to the light from the illumination 10, and the surface finish is vibrated. It is preferable to make it random with no bias in a specific direction such as (non-directional hairline).

Further, the thickness of the calibration plate 11 should be as thin as possible, and the calibration plate 11 is inserted at a low position as close as possible to the conveyor 2. As a result, the height of the surface of the calibration plate 11 approaches the plastic that is actually sorted, so that more accurate calibration can be performed. Further, if the width of the calibration plate 11 in the transport direction is about four times the width of the lamp 10A illuminating the belt (convey path 3), it is easy to insert the calibration plate 11, and it is convenient because damage to the belt due to heat can be prevented. good. Further, the end portion of the calibration plate 11 on the downstream side in the transport direction (that is, the leading portion when the calibration plate 11 is moved from the outside of the field of view to the inside of the field of view of the mid-infrared camera 4 in FIG. 6) has a portion facing the conveyor 2. It is preferable that it has been scraped. This is convenient because it is possible to prevent the calibration plate 11 from coming into contact with the conveyor 2 when the calibration plate 11 is arranged at a predetermined position in the field of view of the mid-infrared camera 4.

As shown in FIG. 6, in the present embodiment, the material determination device 1 uses a mid-infrared camera as a calibration plate 11 for acquiring the _{correction spectra W ref} (n, w) and D _{ref (n, w).} An arm portion 14 (moving portion) for moving between a predetermined reference position outside the field of view of 4 and an irradiation position on the transport path 3 by the illumination 10 is provided.

A calibration plate 11 is connected to the tip portion 14A of the arm portion 14. The arm portion 14 is configured to be rotatable about the base end portion 14B and along the circumferential direction when the extending direction of the arm portion 14 is the radial direction. The calibration plate 11 is installed so that the main surface that receives the light from the illumination 10 faces the rotation center of the arm portion 14.

By making the calibration plate 11 for calibration of the mid-infrared camera 4 movable by the arm portion 14 in this way, the calibration plate is placed in a place that does not interfere with the selection of waste plastic pieces of the material determination device 1 when calibration is not performed. 11 can be moved. Further, when performing calibration, the calibration plate 11 can be installed at a predetermined position simply by rotating the arm portion 14, and work such as positioning and fixing of the calibration plate 11 becomes unnecessary. As a result, the calibration plate 11 for correcting the spectrum can be easily installed and removed, and the acquisition of the correction spectrum can be easily performed.

The calibration plate 11 may be movable between a predetermined reference position outside the field of view of the mid-infrared camera 4 and an irradiation position on the transport path 3 by the illumination 10, and rotates like the arm portion 14. The configuration is not limited to this, and other movement methods may be used.

Further, the conveyor 2 may be stopped when the correction spectrum is acquired. In this case, if the calibration plate 11 is not correctly arranged at the position of the imaging region of the mid-infrared camera 4 due to some malfunction of the arm portion 14 or the like, the infrared rays of the illumination 10 irradiate the infrared rays on the transport path 3 of the conveyor 2. The temperature of the part will rise, and there is a risk of burning or ignition. Therefore, when the calibration plate 11 is not fixed in the field of view of the mid-infrared camera 4, it is preferable to provide an interlock so that the illumination 10 does not irradiate infrared rays.

Returning to FIG. 5, in step S03, the determination unit 52 determines the materials S1 and S2 of the waste plastic piece S using _{the corrected spectrum S cor (n, w).} The determination unit 52 can estimate the correspondence between the spectrum and the material by using an arbitrary method such as known pattern matching or a machine learning algorithm.

As shown in FIG. 6, the illumination 10 has a lamp 10A (sheath heater, carbon lamp, cantal lamp, etc.) that is an infrared light source, and a reflector 10B (reflecting portion) that collects the heat of the lamp 10A. The lamp 10A is formed so as to extend along the width direction (y direction) of the conveyor 2, and is arranged to radiate infrared rays in all directions around the axis along the y-axis. The reflector 10B is arranged on the opposite side of the conveyor 2 from the conveyor 2 with respect to the lamp 10A, and is formed to be curved along the circumferential direction around the axis of the lamp 10A, whereby the lamp 10A to the conveyor 2 Can collect infrared rays radiated on the opposite side, reflect them on the conveyor 2 side, and send them. As a result, the infrared rays emitted by the lamp 10A can be efficiently irradiated to the waste plastic pieces on the transport path 3, and the reflection spectrum can be detected more accurately. Further, since the reflector 10B is curved, the light reflected by the reflector 10B can be applied to the waste plastic piece on the transport path 3 at various angles, and the unevenness of light hitting can be reduced. The reflector 10B is made of, for example, a member plated with aluminum, stainless steel, or aluminum.

Further, as shown in FIG. 6, a cover 10C for preventing heat radiation is covered around the lamp 10A in the circumferential direction. The cover 10C is made of a material that does not have absorption that interferes with measurement with near-red light or medium-red light, for example, quartz glass, and is formed so as to singly or doublely cover the periphery of the lamp 10A. As a result, wasteful heat radiation of the lamp 10A can be prevented, and the infrared rays emitted by the lamp 10A can be efficiently irradiated to the waste plastic pieces on the transport path 3.

Further, a cooling structure may be provided to prevent heat generation of the lamp 10A. For example, the cover 10C may be formed so as to cover the lamp 10A with a pipe made of quartz glass, and air may be circulated in the pipe to prevent heat generation.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those skilled in the art with appropriate design changes to these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the above-mentioned specific examples, its arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. The combinations of the elements included in each of the above-mentioned specific examples can be appropriately changed as long as there is no technical contradiction.

In the above embodiment, the case where the waste plastic whose material is to be determined is the black waste plastic S has been described as an example, but waste plastics of other colors such as red and blue may be used. Further, waste plastics having different colors may be mixed and used.

In order to prevent the temperature of the belt of the conveyor 2 from rising, it may be made of a white material, or a cooling structure may be provided such as blowing cold air on the back surface of the irradiation position of the lamp 10A of the conveyor 2 or bringing the cooled rollers into contact with each other. ..

Further, in order to avoid damage due to temperature rise, a heat-resistant material such as polyurethane or silicon, which is heat-resistant, may be used as the material of the belt of the conveyor 2.

1 Waste plastic material judgment device 2 Conveyor 3 Conveyor 4 Mid-infrared camera (reflection spectrum detector)
5 Discrimination device 51 Pretreatment unit 52 Judgment unit 10 Lighting (irradiation unit)
10A lamp (light source)
10B reflector (reflecting part)
10C cover 11 Calibration plate 14 Arm part (moving part)
S1, S2 Black waste plastic pieces

Claims (4)

It is a material judgment device for waste plastic.
An irradiation part that irradiates a piece of waste plastic transported on the transport path with light,
A reflection spectrum detection unit that receives the reflected light of the light emitted by the irradiation unit and detects the spectrum of the reflected light, and a reflection spectrum detection unit.
The spectrum detected by the reflection spectrum detection unit is used as a first correction spectrum measured under a condition in which the reflected light is bright and a second correction spectrum measured under a condition darker than the bright condition. Pre-processing unit to correct and
A determination unit that determines the material of the waste plastic piece using the spectrum corrected by the pretreatment unit, and a determination unit.
A moving unit that moves the calibration plate for acquiring the first and second correction spectra between a predetermined reference position and an irradiation position on the transport path by the irradiation unit.
A waste plastic material determination device equipped with. The moving portion has an arm portion connected to the calibration plate at its tip, and the arm portion rotates along a circumferential direction when the extending direction of the arm portion is the radial direction around the base end. Possible to be configured,
The waste plastic material determination device according to claim 1. The irradiation part is
A light source that extends in the width direction of the transport path and radiates infrared rays in all directions around the axis in the extending direction.
It has a reflecting portion that is arranged on the side opposite to the transport path with respect to the light source and is formed by being curved along the circumferential direction around the axis of the light source.
The waste plastic material determination device according to claim 1 or 2. The irradiation part is
A cover that covers the periphery of the light source and prevents heat radiation.
The waste plastic material determination device according to claim 3.

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