Identification of plastics by infrared absorption using InGaAsP laser diode

Inada, Koji; Matsuda, Rina; Fujiwara, Chizuru; Nomura, Mitsutoshi; Tamon, Tatsumi; Nishihara, Ikkan; Takao, Takeshi; Fujita, Toshihiro

doi:10.1016/s0921-3449(01)00080-5

Cited by 25 publications

(12 citation statements)

References 7 publications

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“…In this research project, laser diode as a light source for a single wavelength was chosen, instead of a complicated scanning system. The advantages of laser diode are small size, low investment and maintenance costs, and low power consumptions [9][10].…”

Section: Introductionmentioning

confidence: 99%

Laser diode sensors for measuring mechanical properties of recycled plastics

Wasasiri

Pranonsatit

2009

2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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Uncertainty of mechanical properties is one of obstacles in the use of recycled plastic as raw materials. This paper presents a method for measuring mechanical properties of plastic products that are partially made of recycled plastic. Specifically, the plastic type of interest in this project is Polypropylene. The proposed method employs an analysis through a relationship between optical transmittance and tensile strength, which varies with recycled compositions. Adopted from spectroscopy technique, laser diode sensor was used to measure optical transmittance. The sensor is composed of a 1550 nm laser diode as a light source and a photodiode as a detector. Experimental results from laser sensing method are equivalent to results from spectrometry. Optical transmittance, as well as tensile strength, linearly increases with the ratio of recycled plastic. Statistically, every linear function has the coefficient of determination (R 2 ) over 0.95. Thus, the mathematical relationships between optical transmittance and tensile strength were generated. In conclusions, the tensile strength of plastic with different percentages of recycled mixture can be measured by the use of the demonstrated laser diode sensor.

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Section: Introductionmentioning

confidence: 99%

Laser diode sensors for measuring mechanical properties of recycled plastics

Wasasiri

Pranonsatit

2009

2009 6th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technolog

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“…6) since the recycling processes are priority [12]. Separation is further complicated by the current design of products in which polymers are blended with other materials and polymers are currently sorted and separated manually or mechanically, which means its high cost and inefficiency [13].…”

Section: Plastic Waste Managementmentioning

confidence: 99%

Polystyrene Wastes: Threat or Opportunity?

Gutiérrez

Haro

Garcı́a

et al. 2014

The Handbook of Environmental Chemistry

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The recycling of polystyrene (PS) wastes could be considered even economically feasible if, apart from the intrinsic environmental benefits, the wastes are transformed into high-added value products with enhanced properties. In this work, the development of an integral recycling process for polystyrene wastes by means of a new and cost-effective alternative to traditional plastic recycling techniques has been proposed. The methodology consists of the selective dissolution of the plastic wastes with suitable natural solvents (terpene oils) to get a volume reduction without degradation of the polymer chains. The employment of a natural solvent for the treatment of polystyrene wastes transforms the process in an environmentally friendly technology. High pressure CO 2 is proposed to perform the solvent removal in order to avoid the formation of undesirable by-products and to improve the quality of the recycled plastic, since it acts as a physical foaming agent. The use of CO 2 is very attractive because it makes the polymer-solvent separation easier, improves the mass transfer into the highly swelled polymer bulk and allows the tuning of the final properties of the recovered PS. A controlled foaming of the polystyrene-solvent mixtures can be easily carried out at moderate temperatures and pressures by exploiting the advantages that provide the recycling with a natural solvent, obtaining completely free of solvent PS foams. Adjusting the

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“…Conventionally, in the automatic plastics sorting system, it is common to use equipment applying near-infrared spectroscopic analysis with diffraction grating [31], acoust-optic tunable filter [32], or an optical filter [33]. Equipment applying Fourier transforming infrared spectrometry [34], Raman spectrometry [35] or infrared absorption using InGaAsP laser diode [36,37] are also used. Although these devices offer high accuracy, they are not always suitable for current sorting system from the viewpoint of cost-efficiency and handling [37].…”

Section: Dry Separating Techniquesmentioning

confidence: 99%

“…Equipment applying Fourier transforming infrared spectrometry [34], Raman spectrometry [35] or infrared absorption using InGaAsP laser diode [36,37] are also used. Although these devices offer high accuracy, they are not always suitable for current sorting system from the viewpoint of cost-efficiency and handling [37]. Generally speaking, dry gravity separation has the attraction of low capital input and operating cost which together with the lack of water, chemicals and drying requirements means it is environmentally friendly [38].…”

Section: Dry Separating Techniquesmentioning

confidence: 99%

Progress in Separating Plastic Materials for Recycling

Dodbiba

Fujita

2004

Physical Separation in Science and Engineering

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In order to deal with the problems facing the plastics processing industry research, work is focused primarily on designing, developing and testing a variety of separation and sorting techniques able to recover plastics from wastes, which can be re-used or re-processed to form new products. In this regard, technologies developed in mineral processing can be of great help. Various techniques for separating plastics materials have been recently developed. These techniques can be divided in two main categories, i.e. wet separating techniques and dry separating techniques. This paper presents the recent progress in separating plastics reviewing the potential of the available techniques.

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Identification of plastics by infrared absorption using InGaAsP laser diode

Cited by 25 publications

References 7 publications

Laser diode sensors for measuring mechanical properties of recycled plastics

Laser diode sensors for measuring mechanical properties of recycled plastics

Polystyrene Wastes: Threat or Opportunity?

Progress in Separating Plastic Materials for Recycling

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