• Resources Recycling
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• v.22 no.6
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• pp.33-40
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• 2013

Due to the environmental problem caused by plastics largely used in various fields, the importance of recycling is being emphasized. A research on material separation of ABS and PS mixed plastic waste, using a triboelectrostatic separator, was carried out for recovery the ABS. As a results of research on charging characteristic for choosing charging material, it was confirmed that ABS was optimum charging material for a tribo-charger in the material separation of ABS and PS. In the material separation using ABS charger, ABS grade of 99.5% and recovery of 92.5% were achieved at 20 kV, splitter position +2 cm from the center and 30% relative humidity. Therefore, material separation technique for recycling ABS and PS mixed plastic waste was established.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.322-323
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• 2002

다단임팩터와 입자하전기, 전류측정기를 결합하여 입자상물질의 크기분포를 실시간으로 모니터링 할 수 있는 기술에 대하여 기초적인 연구는 선행연구에서 수행되었으며, 다단임팩터의 성능평가 결과는 권순박 등(2002a)이 발표하였으며, 입자하전기에 대한 성능평가결과는 권순박 등(2002b)이 보고하였다. 이에 본 연구에서는 다단임팩터와 입자하전기 및 전류측정장치를 결합하여 입자상물질 실시간 모니터링을 위한 측정장치를 개발하였다. (중략)

• Resources Recycling
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• v.18 no.1
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• pp.13-21
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• 2009

A research on material separation of EVA and PET mixture plastic waste using a triboelectrostatic separator has been carried out. It was found that PP was the best charging material to give the highest charge on the surface of EVA and PET mixture plastics with an opposite polarity. Therefore, a charger of pipe line type using PP material was manufactured for separation of EVA and PET mixture plastic waste. At optimum test conditions that used PP cyclone charger developed in this study, we could separate out PET with a glade of 98.7% and a recovery of 89.7%.

• Proceedings of the Membrane Society of Korea Conference
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• 1993.10a
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• pp.30-30
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• 1993

Polysulfone은 물리적, 화학적 성질이 우수한 재질로 분리막의 소재로 많이 이용되고 있다. 대부분의 막이 sieving mechanism에 기초를 두고 있기 때문에, 크기가 비슷한 물질의 혼합물일 경우는 분리할 수가 없다. 그러나 고정된 전하를 가지고 있는 Polysulfone 하전막을 제조하여, 전기적 효과에 의해서 전하를 띠는 물질과 중성인 물질을 분리해 낼 수 있다. 또한 하전막은 막과 동일한 전하를 가지고 있는 물질과 colloid를 배제하여 막표면에 gel layer가 형성되는 것을 방지하여 fouling을 감소시킬 수 있다.

• Resources Recycling
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• v.16 no.5
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• pp.51-56
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• 2007

Plastics are widely used in everyday life as very useful material. In Korea, about 4 million tons of plastic wastes are generated annually. However, recycling ratio is below 30%, and most of plastic wastes are disposed by landfill and incineration. Hence, the development of material separation technique that can recycle plastic wastes is a necessary situation. In this study, Triboelectrostatic separation for recovery of PET from final plastic wastes obtained from the sink product after wet-type gravity separation has been carried out. In the charging properties, the charge polarity and charge density of PET and PVC were very effective with the tirbo-charger made of PP and HDPE with the decrease in relative humidity. In material separation using HDPE cyclone charger, a PET grade of 96.80% and a recovery of 85.0% were achieved at 30 kV and the splitter position -2cm from the center. In order to obtain PET grade of 98.5%, PET recovery should be sacrificed by 24% with moving the splitter from the center to -6cm position.

• Resources Recycling
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• v.18 no.2
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• pp.30-38
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• 2009

In this research, we studied the scale-up triboelectrostatic process for separation of PVC from higher gravity fraction of plastic wastes produced from wet gravity separation process. High density polyethylene (HDPE) was found to be the most effective materials for a tribo-charger in the separation of plastic tailings. In a commercial scale triboelelctrostatic separator unit, using the HDPE pipe-line charger, a grade of 99.1% with PET, PS and others and a recovery of 86% was obtained under optimum conditions at over 250 kV/m electric field, a splitter position of -8 cm from the center, and less than 40% relative humidity. The developed unit can process the plastic wastes at a 300 kg/h, and the product can be utilized as RPF or RDF of over grade 2.

• Resources Recycling
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• v.11 no.3
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• pp.37-45
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• 2002

Triboelectrostatic Separation procese is a technology that different particles charged after contact and rubbing different materials are separated in an electric field. At this time, charged polarity of different materials depends on their own work function. Therefore this study discovers work functions of various plastics and determines charging characteristics for the specific optimum operation condition. The experiment is conducted with two sample sets composed of various different plastics. Each sample is charged by contact and rubbing different materials. Surface charge of charged particles is measured by Faraday Cage. The specific work function of an each plastic is driven by measured charging amount and charged particles are separated in a certain electric field ($\pm$20 kV). At last, the relationship between charging amount and separation efficiency is induced by the separation experiment.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2005.05a
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• pp.375-376
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• 2005

본 연구에서는 폐전선 피복플라스틱의 재활용을 위해 마찰하전형 정전선별법을 이용하여 PVC와 rubber의 재질분리 실험을 수행하였다. 하전물질의 종류에 따른 실험결과 PVC와 Rubber의 중간 일함수 값을 갖고 있는 PP 재질이 가장 효과적이었으며, 단일 시료보다PVC와 Rubber의 혼합조건에서 더 높은 하전 값을 나타내었다. 하전특성 실험결과 공기량은 10.28wt/s 이상 그리고 상대습도는 40% 이하의 조건에서 입자의 높은 하전량을 얻을 수 있음을 확인하였다. 분리특성 실험결과 전압세기가 25kv 이상 그리고 분리대의 위치는 전기장의 중앙(0)으로부터 Negative 전극으로 -lcm 이동한 지점으로, 이때 PVC의 품위와 회수율을 각각 99.5%와 95%인 결과를 얻었다.

• Resources Recycling
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• v.15 no.1 s.69
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• pp.28-36
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• 2006

The development of material separation technique for waste plastic recycling are the necessary situation restricted by law the reclamation and incineration of waste plastic after 2004, with enforcement of EPR (Extended Producer Responsibility) system. As the this study is the research on the development of electrostatic separation techniques for recycling of life circles waste plastic by development of charging material and charger, the separation efficiency can be improved. Therefore, we developed the charger and electrostatic separator to increase charging efficiency and material separation per object plastics, rising these equipments, we removed PVC up to $99\%$ from two kinds of mixed plastics. And in case of restricting PVC content such as PET, we developed the separation technique that can remove PVC up to $99.99\%$ from PET with PET recovery about $80\%$. Also, as we separated over $98\%$ for three kinds of mixed plastics, and then established material separation technique to increase recycling of plastic.

• Proceedings of the Membrane Society of Korea Conference
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• 2005.05a
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• pp.42-45
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• 2005