Recycled resin determination device, recycled resin determination method, control program, and recording medium

Abstract

To provide a recycled resin determination device and the like capable of determining the quality of a recycled resin based on a detection signal acquired from an odor sensor.SOLUTION: A recycled resin determination device (2) includes a determination unit (212) that determines the quality of a recycled resin based on at least one of a plurality of detection signals acquired from each of a plurality of sensor elements (11) that output detection signals (114) corresponding to odors derived from the recycled resin, and an output control unit (214) that causes an output device (3) to output a determination result of the determination unit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a recycled resin determination device, a recycled resin determination method, a control program, and a recording medium.

Background Art

[0002] In recent years, the development of technologies for recycling plastic waste into new plastic materials has been underway. For example, Patent Document 1 describes a plastic recycling method in which plastic waste mixed with foreign substances is pulverized into small pieces together with the foreign substances, then heated and melted to form small grains, processed into fine particles, and then extruded into pellets. According to this method, since foreign substances are processed into fine particles together with plastic waste, clogging of the screen can be prevented, and pellets can be produced efficiently.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, recycled resin may emit an abnormal odor compared to virgin resin because odor components are generated due to the decomposition of the resin itself, and there is a possibility that abnormal odor substances may adhere depending on the use before recycling. In the technique described in Patent Document 1 above, among the recycled resins, high-quality ones that do not relatively smell and low-quality ones with a strong smell are recycled into pellets in a mixed state, so there is a problem that the newly recycled pellets become low-quality as a whole.

[0005] One aspect of the present invention has been made in view of the above problems, and an object thereof is to provide a recycled resin determination device or the like that can determine the quality of recycled resin based on a detection signal acquired from an odor sensor.

Means for Solving the Problem

[0006] In order to solve the above problems, a recycled resin determination device according to an aspect of the present invention includes a determination unit that determines the quality of the recycled resin based on at least any one of a plurality of detection signals acquired from each of a plurality of sensor elements that output detection signals corresponding to odors derived from the recycled resin, and an output control unit that causes the output device to output the determination result of the determination unit.

[0007] Also, in order to solve the above problems, an information processing method according to an aspect of the present invention includes a determination step of determining the quality of the recycled resin based on at least any one of a plurality of detection signals acquired from each of a plurality of sensor elements that output detection signals corresponding to odors derived from the recycled resin, and an output control step of causing the output device to output the determination result in the determination step.

Advantages of the Invention

[0008] According to an aspect of the present invention, it is possible to provide a recycled resin determination device or the like that can determine the quality of the recycled resin based on the detection signal acquired from the odor sensor.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

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Figure 7

Embodiments for Carrying Out the Invention

[0010] <Configuration of Odor Detection System 100> Hereinafter, embodiments of the present invention will be described in detail. The odor detection system 100 according to the embodiments of the present invention determines the quality of recycled resin based on detection data 114 (detection signal) acquired from an odor sensor 10 in a resin recycling process.

[0011] Thereby, it becomes possible to sort high-quality recycled resin and low-quality recycled resin, and the value of the recycled resin as a whole can be improved. For example, low-quality recycled resin with a strong odor can be used as a material for benches, etc., and high-quality recycled resin with almost no odor can be used as a material for food trays, etc.

[0012] Here, the recycled resin includes products using recycled resin, crushed products of recovered resin products, and recycled resin pellets used in the manufacture of recycled resin products, etc.

[0013] FIG. 1 is a functional block diagram showing an example of the main configuration of an odor detection system 100 according to an embodiment of the present invention. As shown in FIG. 1, the odor detection system 100 includes an odor detection device 1, an odor determination device 2 (recycled resin determination device), and an output device 3. The odor determination device 2 is communicably connected to the odor detection device 1 and the output device 3.

[0014] The odor detection system 100 is not limited to this. For example, the odor determination device 2 may include the output device 3, or may be configured to include the odor detection device 1. Also, it may be configured to include both the output device 3 and the odor detection device 1.

[0015] The odor detection device 1 is a device for detecting the odor of recycled resin, and includes a sampling bag 12, a sensor chamber 13, and a communication unit 14 for communicating with other devices.

[0016] The sampling bag 12 is a sealed container that stores a gas containing odor substances generated from recycled resin and has heat resistance. The material of the sampling bag 12 includes, for example, polyvinylidene fluoride, polyvinyl fluoride, aluminum, fluororesin, or polyester, etc., but is not particularly limited and may be borosilicate glass, stainless steel, etc. In one example, the sampling bag 12 only needs to have resistance to temperatures from 0 to 80 °C.

[0017] When detecting the odor of recycled resin, first, a recycled resin sample to be detected and nitrogen gas are sealed in the sampling bag 12. For example, when the volume of the sampling bag 12 is 2 liters, about 20 g to 40 g of the recycled resin sample and about 200 to 1,000 mL of nitrogen gas are sealed. The amounts of the recycled resin sample and nitrogen gas to be sealed may be appropriately changed according to the volume of the sampling bag 12. Also, instead of the recycled resin sample, the gas generated from the recycled resin sample may be collected and the collected gas may be sealed in the sampling bag 12.

[0018] Next, the sampling bag 12 containing the recycled resin sample and nitrogen gas is heated at about 70 °C for about 2 to 4 hours to generate a gas containing odor substances from the recycled resin sample. The heating temperature and heating time of the sampling bag 12 can be appropriately changed, and heating may not be necessary if detection is possible without heating.

[0019] After the heating of the sampling bag 12 is completed, the sampling bag 12 is left at room temperature for about 15 minutes.

[0020] Thereafter, the gas 121 generated from the recycled resin sample and nitrogen gas (hereinafter referred to as "sample gas") in the sampling bag 12 is supplied into the sensor chamber 13 by a pump or the like.

[0021] The sensor chamber 13 has an accommodation space formed therein, and the odor sensor 10 is disposed in the accommodation space.

[0022] The odor sensor 10 is a sensor that detects odor substances contained in the sample gas 121, and includes a plurality of odor sensor elements 11 having different characteristics. The number of odor sensor elements 11 provided in the odor sensor 10 is not particularly limited. For example, in the present embodiment, five odor sensor elements 11 are provided.

[0023] Since the plurality of odor sensor elements 11 have different characteristics, they can adsorb different types of odor substances. Each odor sensor element 11 detects a change in resistance value (ΔR) due to the adsorption of an odor substance, and outputs a detection signal for each odor sensor element 11. The odor sensor 10 transmits, as detection data 114, the detection intensity of the detection signals output by each odor sensor element 11 to the odor determination device 2 via the communication unit 14. Details of the odor sensor element 11 will be described later.

[0024] Here, the detection data 114 may be a value indicating the detection intensity by the odor sensor 10 based on the detection signals indicating the changes in resistance value (ΔR) respectively detected by the plurality of odor sensor elements 11, as described above. Further, the detection data 114 may be the change over time of the detection intensity by the odor sensor 10. For example, among the detection signals detected by the plurality of odor sensor elements 11, the largest one may be used as the detection intensity by the odor sensor 10.

[0025] FIG. 2 is an example of a graph showing the detection intensity detected by the odor sensor 10. As shown in FIG. 2, L1 indicates the detection intensity when the recycled resin sample is heated at about 70° C. for about 4 hours, and L2 indicates the detection intensity when heated for about 2 hours. L3 indicates the detection intensity when the virgin resin sample is heated at about 70° C. for about 4 hours, and L4 indicates the detection intensity when heated for about 2 hours.

[0026] Here, the "virgin resin" refers to a resin that has no history of being recycled, that is, a newly produced resin. On the other hand, the "recycled resin" refers to a resin produced by including a recycled resin material as a material.

[0027] From FIG. 2, since the detection intensities of the recycled resins L1 and L2 are greater than those of the virgin resins L3 and L4, it can be seen that the recycled resin has a stronger odor compared to the virgin resin.

[0028] Returning to FIG. 1 for explanation again. The odor determination device 2 includes a control unit 21, a storage unit 22, and a communication unit 23 for communicating with other devices.

[0029] The storage unit 22 stores various data used by the control unit 21. When the odor determination device 2 determines the quality of the recycled resin by machine learning described later, the determination model 221 may be stored in the storage unit 22. Although details will be described later, the determination model 221 is a learned model generated by machine learning. Note that the storage unit 22 may be a storage unit within the odor determination device 2 or an external storage communicably connected outside the odor determination device 2.

[0030] The control unit 21 comprehensively controls each part of the odor determination device 2. The control unit 21 includes an acquisition unit 211, an odor determination unit 212, an output control unit 214, and a communication control unit 215.

[0031] The acquisition unit 211 acquires the detection data 114 transmitted from the odor detection device 1 via the communication unit 23 and transmits it to the odor determination unit 212.

[0032] The odor determination unit 212 performs, for example, principal component analysis on the transmitted detection data 114 and determines the quality of the recycled resin based on the analysis result.

[0033] FIG. 3 is an example of a scatter diagram showing the principal component analysis of the detected odor substances. The scatter diagram plots the values related to the detected odor substances with the horizontal axis being the first principal component PC1 and the vertical axis being the second principal component PC2.

[0034] As shown in FIG. 3, since the population of plots of virgin resin (newly generated resin) and the population of plots of recycled resin are greatly separated from each other, it can be seen that virgin resin and recycled resin have non-similar characteristics. Specifically, it can be seen that the recycled resin has a stronger odor and poorer quality compared to the virgin resin. On the other hand, if the coordinate positions of the population of plots of virgin resin and the population of plots of recycled resin are close, it can be determined that the recycled resin does not have a stronger odor and has high quality compared to the virgin resin.

[0035] In this way, the quality of the recycled resin compared to the virgin resin can be shown based on the plotted coordinate positions. Also, when there are multiple types of recycled resins, the difference in quality between the recycled resins can be shown.

[0036] The odor determination unit 212 generates scatter diagram data and transmits it as determination result data to an output device 3 described later. By displaying this scatter diagram on a display unit 31 described later, the quality of the recycled resin can be visualized and displayed.

[0037] Also, the odor determination unit 212 may set a threshold value P for the detection data 114 and determine the quality of the recycled resin using the set threshold value P. In this case, for example, the threshold values are divided into three grades: high quality for P1 to P2, medium quality for P3 to P4, and low quality for P5 to P6, and the quality of the recycled resin may be determined according to which grade the detection data 114 belongs to.

[0038] Also, the odor determination unit 212 may determine the quality of the recycled resin based on the comparison result between the detection intensity of the virgin resin and the detection intensity of the recycled resin.

[0039] Furthermore, the odor determination unit 212 may determine the quality of the recycled resin using the determination model 221. The determination model 221 is a learned model that has learned the correspondence between the detection data 114 and the quality of the recycled resin by machine learning. In this case, the odor determination unit 212 determines, using the determination model 221, that the quality corresponding to the detection data 114 acquired from the odor sensor 10 is the quality of the recycled resin.

[0040] Returning to FIG. 1 for explanation again. The output control unit 214 transmits the data of the determination result generated by the odor determination unit 212 to the output device 3 via the communication control unit 215.

[0041] The output device 3 includes a display unit 31 and a communication unit 32 for communicating with other devices. The display unit 31 is, for example, a liquid crystal display and displays various information.

[0042] The output device 3 displays, on the display unit 31, for example, a scatter diagram indicating the quality of the recycled resin or a table indicating the quality of the recycled resin, etc., from the data of the determination result received via the communication unit 32. Further, the output device 3 may indicate the quality of the recycled resin by means of graphics, characters, numerical values, etc.

[0043] <Odor sensor element 11> Next, a plurality of odor sensor elements 11 will be described with reference to the drawings. Each odor sensor element 11 outputs, for each odor sensor element 11, a value indicating the change over time in the electrical conductivity of the odor sensor element 11 before and after an odor substance is adsorbed to the odor sensor element 11. Thereby, the odor detection device 1 can detect various odor substances.

[0044] FIG. 4 is a diagram showing an example of the configuration of the odor sensor element 11. As shown in FIG. 4, the odor sensor element 11 is, for example, a chemoresistor type odor sensor element and includes a receiving layer 111, a pair of electrodes 112, and a substrate 113. The receiving layer 111 and the pair of electrodes 112 are disposed on the substrate 113.

[0045] The receiving layer 111 includes various resins 111a and a conductive material 111b uniformly contained in the resin 111a, and selectively adsorbs the odorant to be detected.

[0046] Examples of the composition of the resin 111a include polyvinylidene fluoride, polyolefin, silicone resin, (meth)acrylic resin, polyester resin, polycarbonate, polyacetal resin, furan resin, ketone resin, polyvinyl chloride resin, polyurethane resin, polyamide resin, polyimide resin, polyallylamine resin, polyvinyl acetal resin, and polyether resin. Further, modified products, copolymers, etc. thereof may also be used, and preferably, silicone resin, polyester resin, polyvinyl acetal resin, etc. are mentioned. The resin 111a only needs to be a resin that adsorbs the odorant and is not particularly limited. Since the substances that are easily adsorbed vary depending on the composition of the resin 111a, the odorant can be selectively adsorbed to the receiving layer 111 by changing the composition of the resin 111a.

[0047] The conductive material 111b is realized by, for example, carbon black, metal particles, conductive polymers, etc. Examples of the metal particles include silver, copper, nickel, aluminum, and alloys thereof. Examples of the conductive polymers include polyaniline, polythiophene, polypyrrole, polyacetylene, polyphenylene vinylene, and polynaphthalene.

[0048] The electrode 112 includes a pair of electrodes 112a and 112b arranged apart from each other.

[0049] The receiving layer 111 is arranged, for example, between the electrode 112a and the electrode 112b so as to be in contact with both electrodes of the electrode 112a and the electrode 112b. When a voltage is applied between the electrode 112a and the electrode 112b, a current flows from the electrode 112a to the electrode 112b through the receiving layer 111.

[0050] When an odorant is adsorbed by the receptor layer 111, the receptor layer 111 swells due to the adsorbed odorant. As a result, compared to before adsorption, it becomes more difficult for current to flow through the receptor layer 111, and the value of the resistance (R) increases.

[0051] At this time, the detected resistance value (R) differs depending on the adsorbed odorant. For example, the resistance value (R) is different between the case where odorant A is adsorbed and the case where an odorant B different from odorant A is adsorbed. The odor detection device 1 can detect and identify the adsorbed odorant by detecting this change in the resistance value (R).

[0052] The compositions of the respective receptor layers 111 provided in the plurality of odor sensor elements 11 may be the same or different from each other. When each receptor layer 111 has the same composition, the plurality of odor sensor elements 11 can each detect the same odorant.

[0053] Also, when each receptor layer 111 has a different composition, since there are differences in the adsorption amounts even for the same odorant depending on the composition of the receptor layer 111, each of the plurality of odor sensor elements 11 can output different resistance values (R) for the same odorant.

[0054] The odor sensor 1 includes a plurality of combinations of odor sensor elements 11 having receptor layers 111 with different compositions, thereby being able to detect odorants containing various components that have been difficult to identify heretofore. Also, the identification accuracy of the odorant of the odor sensor 1 can be improved. Note that the combination of the odor sensor elements 11 can be appropriately changed according to the type of odorant to be detected.

[0055] The following is a configuration example of the receptor layer 111 when five odor sensor elements 11 are provided. 1) relates to the resin 111a, 2) relates to the conductive material 111b, 3) relates to the surfactant, and 4) is the ratio of the resin 111a described in 1), the conductive material 111b described in 2), and the surfactant described in 3). (1) 1) Polyvinylpyrrolidone (Polyvinylpyrrolidone K90, manufactured by FUJIFILM Wako Pure Chemical Corporation) 2) SUPER C-65 (manufactured by MTI Corporation, USA) 3) Polyether phosphate ester amine (Disparlon (registered trademark) DA-325, manufactured by Kusumoto Chemicals, Ltd.) 4) 72:20:8 (2) 1) Polymethyl methacrylate (manufactured by FUJIFILM Wako Pure Chemical Corporation) 2) SUPER C-65 (manufactured by MTI Corporation, USA) 3) Polyether phosphate ester amine (Disparlon DA-325, manufactured by Kusumoto Chemicals, Ltd.) 4) 72:20:8 (3) 1) Polyvinyl chloride (manufactured by FUJIFILM Wako Pure Chemical Corporation) 2) SUPER C-65 (manufactured by MTI Corporation, USA) 3) Polyether phosphate ester amine (Disparlon DA-325, manufactured by Kusumoto Chemicals, Ltd.) 4) 72:20:8 (4) 1) Silicone resin (DOWSIL (registered trademark) RSN-0255 Flake Resin, manufactured by DOW Co., Ltd.) 2) SUPER C-65 (manufactured by MTI Corporation, USA) 3) Polyether phosphate ester amine (Disparlon DA-325, manufactured by Kusumoto Chemicals, Ltd.) 4) 72:20:8 (5) 1) Cellulose acetate (manufactured by FUJIFILM Wako Pure Chemical Corporation) 2) SUPER C-65 (manufactured by MTI Corporation, USA) 3) Polyether phosphate ester amine (Disparlon DA-325, manufactured by Kusumoto Chemicals, Ltd.) 4) 72:20:8

[0056] Note that the odor sensor element 11 is not limited to a chemoresistor-type odor sensor element, and may include one or more odor sensor elements used in known odor sensors or the like.

[0057] <Detection of odor substances> FIG. 5 is a diagram for explaining the detection of odor substances by the odor sensor element 11. The upper diagram in FIG. 5 is a diagram for explaining the detection of odor substances in the sensor chamber 13 in time series, and the lower diagram is a graph showing the resistance value (R) corresponding to the upper diagram.

[0058] As shown in FIG. 5, first, in the first step (time: T0 to T1), nitrogen gas N2 is supplied into the sensor chamber 13 to discharge the odor substances remaining in the sensor chamber 13. At this time, the resistance value (R) of the odor sensor element 11 hardly changes and remains horizontal.

[0059] Next, in the second step (time: T1 to T2), the sample gas 121 containing the odor substance is supplied into the sensor chamber 13. Since the odor substance is adsorbed on the receiving layer 111 of the odor sensor element 11, the receiving layer 111 swells. As the receiving layer 111 swells, the resistance value (R) increases.

[0060] When the detection is completed, in the third step (time: T2 to T3), nitrogen gas N2 is supplied into the sensor chamber 13 as a purge gas to discharge the odor substances in the sensor chamber 13. At this time, as the odor substances are discharged, the resistance value (R) decreases and returns to the resistance value (R) before the gas containing the odor substances is supplied. <Flow of quality determination process of control unit 21>

[0061] With reference to FIG. 6, an example of the flow of the above-described configuration process in the control unit 21 of the odor determination device 2 will be described. FIG. 6 is a flowchart showing an example of the flow of the odor determination process executed by the control unit 21.

[0062] First, the acquisition unit 211 acquires the detection data 114 transmitted from the odor detection device 1 via the communication unit 14 and the communication unit 23, and sends the acquired detection data 114 to the odor determination unit 212 (S1). Note that the acquisition unit 211 may send the detection data 114 to the storage unit 22 and have the storage unit 22 store the detection data 114.

[0063] The odor determination unit 212 receives the detection data 114 sent from the acquisition unit 211. The odor determination unit 212 determines the quality of the recycled resin based on the received detection data 114 (S2: determination step).

[0064] The odor determination unit 212 generates determination result data based on the determined result. Note that the odor determination unit 212 may send the generated determination result data to the storage unit 22 and have the storage unit 22 store the determination result data associated with the detection data 114.

[0065] The output control unit 214 sends the determination result data sent from the odor determination unit 212 to the output device 3 (S4: output control step). <Timing of quality determination>

[0066] FIG. 7 is a diagram for explaining the timing of determining the quality of the recycled resin. As shown in FIG. 7, as an example of the resin recycling process, first, plastic products 51 are distributed in the market. Then, they are used by consumers or the like and become used plastic products 52. The used plastic products 52 are collected and washed 53. After that, they are crushed into small pieces by a crusher or the like and become crushed materials 54. The crushed materials 54 are further processed into fine particles and then formed into recycled resin pellets 55. The recycled resin pellets 55 are formed into plastic products again.

[0067] The odor determination device 2 according to the present invention can, for example, perform quality determination on the crushed material 54 at the stage shown as "P1" in FIG. 7, that is, after the used plastic product 52 is crushed into the crushed material 54 and before it is formed into the recycled resin pellets 55. Thereby, the crushed material 54 can be sorted by quality before being formed into the recycled resin pellets 55.

[0068] Further, the determination device 2 can, for example, perform it on the recycled resin pellets 55 at the stage shown as "P2" in FIG. 7, that is, after being formed into the recycled resin pellets 55 and before being formed into a plastic product again. Thereby, the recycled resin pellets 55 can be sorted by quality in the state immediately before being formed into a plastic product.

[0069] The quality determination by the odor determination device 2 is not limited to this. For example, it may be performed after washing before being crushed, or on the finished product after the recycled resin pellets 55 are formed into a plastic product. Also, quality determination may be performed on the recycled resin pellets 55, and the quality of the plastic product after completion may be predicted based on the determination result.

[0070] 〔Example of Realization by Software〕 The function of the odor determination device 2 (hereinafter referred to as the "device") is a program for causing a computer to function as the device, and can be realized by a program for causing a computer to function as each control block of the device (especially each part included in the control unit 21).

[0071] In this case, the above device includes a computer having at least one control device (for example, a processor) and at least one storage device (for example, a memory) as hardware for executing the above program. By executing the above program with this control device and storage device, each function described in the above embodiments is realized.

[0072] The above program may be recorded on one or more computer-readable recording media, rather than temporarily. This recording medium may or may not be provided in the above device. In the latter case, the above program may be supplied to the above device via any wired or wireless transmission medium.

[0073] Also, part or all of the functions of each of the above control blocks can also be realized by a logic circuit. For example, an integrated circuit in which a logic circuit functioning as each of the above control blocks is formed is also included in the scope of the present invention. In addition to this, for example, it is also possible to realize the functions of each of the above control blocks by a quantum computer.

[0074] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0075] 〔Summary〕 The recycled resin determination device according to Aspect 1 of the present invention includes a determination unit that determines the quality of the recycled resin based on at least any one of a plurality of detection signals acquired from each of a plurality of sensor elements that output detection signals corresponding to odors derived from the recycled resin, and an output control unit that causes the output device to output the determination result of the determination unit.

[0076] The recycled resin determination device according to Aspect 2 of the present invention, in the above Aspect 1, the determination unit may determine the quality of the recycled resin based on a comparison result between a control detection signal corresponding to an odor derived from a resin having no history of being reused and the detection signal corresponding to the odor derived from the recycled resin.

[0077] The recycled resin determination device according to Aspect 3 of the present invention, in the above Aspect 1 or 2, the recycled resin may be recycled resin pellets used in the manufacture of recycled resin products.

[0078] The recycling resin determination device according to aspect 4 of the present invention may be, in the above aspect 1 or 2, the recycled resin may be a pulverized product of a recovered resin product.

[0079] The recycling resin determination device according to aspect 5 of the present invention may be, in the above aspect 1 or 2, the recycled resin may be a product using the recycled resin.

[0080] The recycling resin determination method according to aspect 6 of the present invention includes a determination step of determining the quality of the recycled resin based on at least any one of a plurality of detection signals obtained from each of a plurality of sensor elements that output detection signals corresponding to the odor derived from the recycled resin, and an output control step of causing an output device to output the determination result in the determination step.

[0081] The control program according to aspect 7 of the present invention may be a control program for causing a computer to function as the recycling resin determination device of aspects 1 to 5, and may be a control program for causing a computer to function as the determination unit and the output control unit.

[0082] The recording medium according to aspect 8 of the present invention may be a computer-readable recording medium recording the control program according to aspect 7.

Description of reference numerals

[0083] 2 Odor determination device (Recycling resin determination device) 3 Output device 11 Odor sensor element 54 Pulverized product 55 Recycling resin pellet 114 Detection data (detection signal) 212 Odor determination unit 214 Output control unit

Claims

1. A determination unit that determines the quality of the recycled resin based on at least any one of a plurality of detection signals obtained from each of a plurality of sensor elements that output detection signals corresponding to the odor derived from the recycled resin; An output control unit that causes the output device to output the determination result of the determination unit; A recycled resin determination device comprising the above.

2. The determination unit: Determines the quality of the recycled resin based on the comparison result between a reference detection signal corresponding to the odor derived from a resin having no history of being reused and the detection signal corresponding to the odor derived from the recycled resin. The recycled resin determination device according to Claim 1.

3. The recycled resin is recycled resin pellets used in the manufacture of recycled resin products. The recycled resin determination device according to Claim 1.

4. The recycled resin is a pulverized product of a recovered resin product. The recycled resin determination device according to Claim 1.

5. The recycled resin is a product using the recycled resin. The recycled resin determination device according to Claim 1.

6. A determination step of determining the quality of the recycled resin based on at least any one of a plurality of detection signals obtained from each of a plurality of sensor elements that output detection signals corresponding to the odor derived from the recycled resin; An output control step of causing the output device to output the determination result in the determination step; A recycled resin determination method including the above.

7. A control program for causing a computer to function as the recycled resin determination device according to Claim 1, the control program for causing a computer to function as the determination unit and the output control unit.

8. A computer-readable recording medium recording the control program according to Claim 7.

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