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NIR . . ) [email protected] ( * . . : - . ) NIR ( . . . PET HDPE PVC PP PS LabVIEW . . . . : LabVIEW Journal of Separation Science and Engineering Vol. 2, No. 1, 2010, pp. 85-104

NIRgiau.ac.ir/Uploads/Public/maghalat/joda.pdf,56 04 (,/01 ) , ˘ˇ ; . . . Automated Separation of Plastic Resins Types by the Second Order Derivative Method Based on NIR Reflectance

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Page 1: NIRgiau.ac.ir/Uploads/Public/maghalat/joda.pdf,56 04 (,/01 ) , ˘ˇ ; . . . Automated Separation of Plastic Resins Types by the Second Order Derivative Method Based on NIR Reflectance

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Thermoplastics Using Near-Critical Liquids”, Proc. Globec Davos, Switzerland, Paper 18.

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Automated Separation of Plastic Resins Types by the Second Order Derivative Method Based on NIR Reflectance Spectroscopy

Seyed Mohsen Safavi1, Hamed Masoumi2, Seyed Saeid Mirian3, Mahmoud Tabrizchi4

1. Assistant Professor of Mechanical Engineering, Isfahan University of Technology. 2. Instructor of Mechanical Engineering, Islamic Azad University, Golpayegan Branch. 3. PhD Student of Mechanical Engineering, Isfahan University of Technology. 4. Professor of Chemistry, Isfahan University of Technology.

A R T I C L E I N F O A B S T R A C T

Article history : Received 14 February 2009 Received in revised form 16 May 2010 Accepted 30 June 2010

In this paper, an appropriate, accurate and fast method for automated separation of plastic resins from post consumer plastic wastes is presented. The principle of sorting system operation is based on Near Infrared (NIR) reflectance spectroscopy. In this system, the plastic samples are fed on the sorting conveyor. When the samples are crossing from the near of conveyor end, their NIR reflectance spectrum is taken by a rapid spectrometer device. The control unit takes the second derivative of spectrum graph and then recognizes the sample material by analyzing this graph. Finally the target plastic resin is thrown to proper location by compressed air jet. According to current study, it is possible to separate PET, HDPE, PVC, PP and PS resins automatically by LabVIEW software. The accuracy of this method has been demonstrated for different resins. Also the effect of various parameters such as surface pollution, sample thickness and existence of label and cap has been studied on identification system. Experimental results, have confirmed the high accuracy of this new method.

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Keywords:

Plastic Separation reflectance spectroscopy near infrared 2nd order derivative LabVIEW software