• Resources Recycling
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• v.6 no.2
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• pp.42-46
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• 1997

The paper reviews various aspects of recycling of used PET bottles. First, it lists the kinds of PET bottles and the amounts used in Korea. It also reviews the recychng pallcics and culrent recycling status of various countncs such as the USA, Tawan. Japm and Karca. A brief flowsheel of recycling process for PET bottles is prescntzd. Problzms assodated with recychng thesc bottlcs arc discussed and various impravements rcqu~red in make such a recycling process better are also suggested and d~scussed.

• Annual Conference of KIPS
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• 2021.11a
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• pp.640-642
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• 2021

비전 기반의 재활용-PET 선별공정에서, PET 외 물체와의 식별 성능은 물론 PET 용기 내 포함된 이물질 및 라벨, 뚜껑의 존재 여부, 색상에 대한 검출 성능은 재활용 소재 품질에 중요한 영향을 미친다. 본 연구에서는 비전 인공지능 기반의 재활용-PET 자동 선별 시스템을 제안하고, 인공지능 모델의 제작에서 감독학습의 학습 효과를 최적화하기 위한 데이터 레이블링 기법을 제안한다. 재활용대상 PET 와 이물질 파트가 포함된 용기의 컨베이어벨트 선별공정 혼입을 재현한 실험을 통해서, 재활용 소재화 물량과 순도를 최대화하기 위한 인공지능 모델 생성 방법에 대해 고찰한다.

• Resources Recycling
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• v.3 no.1
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• pp.44-51
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• 1994

PET bottles were composed of several different materials such as PET, HDPE, PVC and PP, it is necessary for recycling of PET bottles to precede seperation of each material. This study is purposed of recycling of PET bottles by separation using float and sink method. Pure PET is obtained a proportion of 94% on condition that bottle labels were removed by using tap water. In case the labels were attached on the bottles, PET was unable to obtain because of PVC and PET sink, and PP and HDPE float. Therefore, the labels should be removed before separation of PVC lebels substituted for PP or PE material. The various physical properties of recovered PET and HDPE were measured and compared with the original PET and HDPE, and it is identified that recycling is possible as a result.

• The monthly packaging world
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• s.246
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• pp.58-74
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• 2013

(사)한국페트병자원순환협회는 PET병 재활용에 관계된 한국과 일본의 PET병 재활용 관련 단체 등의 정기적인 교류를 통해 정보를 교환하고 협력방안을 모색하기 위한 정기교류회를 실시하고 있다. 2013년도 정기교류회 세미나에서는 국내 PET병 재질 구조 사전 평가제도 및 정책 동향에 대한 설명과 함께 일본용기포장재활용제도에 대한 안내와 재활용 동향에 대한 소개가 있었다. 본 고에서는 일본 PET병 재활용 연차보고서를 통해 PET병의 재활용 동향을 살펴보도록 한다.

• Journal of the Korea Concrete Institute
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• v.16 no.6 s.84
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• pp.767-776
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• 2004

Polymer concrete shows excellent mechanical properties and chemical resistance compared with conventional normal cement concrete. The polymer concrete is drawing a strong interest as high-performance materials in the construction industry. Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems posed by plastics and save energy. The purposed of this paper is to propose the model for the stress-strain relation of recycled-PET polymer concrete at monotonic uniaxial compression and is to investigate for the stress-strain behavior characteristics of recycled-PET polymer concrete with different variables(strength, resin contents, curing conditions, addition of silane and ages). The maximum stress and strain of recycled-PET polymer concrete was found to increase with an increase in resin content, however, it decreased beyond a particular level of resin content. A ascending and descending branch of stress-strain curve represented more sharply at high temperature curing more than normal temperature curing. Addition of silane increases compressive strength and postpeak ductility. In addition, results show that the proposed model accurately predicts the stress-strain relation of recycled-PET polymer concrete

• Elastomers and Composites
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• v.47 no.2
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• pp.96-103
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• 2012

This paper reviews recent technologies for recycling poly (ethylene terephthalate) wastes. Wide application and non-biodegradability of the PET creates huge amounts of waste and disposal, leading to an environmental problem and economic loss. Chemical recycling can be a promising technology to deal with these problems by converting the waste into useful feedstock material for polyester production. Chemical recycling of polyethylene terephthalate are processes where the PET polymer chain is destructed by the impact of glycol (MEG) causing glycolysis, methanol causing methanolysis or water causing hydrolysis. After intensive purification polyester oligomers or the monomers MEG, dimethyl telephthalate (DMT) or purified terephthalic acid (PTA) are received which are re-used to produce polyester products.

• Composites Research
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• v.30 no.3
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• pp.175-180
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• 2017

Currently, since carbon fiber reinforced plastics (CFRPs) are lightweight and have excellent physical properties, their demand has increased dramatically. Many works have studied the CFRPs based on recycled thermoplastics. In this study, the applicability of recycled composite was evaluated using recycled polyethylene terephthalate (PET). PET was collected from waste materials used in beverage bottles and processed to produce PET films. Optimal thermoforming temperature and time were analyzed by comparing the mechanical properties with forming temperature and time difference for producing PET films. CF mat and PET film were used to determine the suitable parameters for the optimum thermoforming of CF/PET composites. The mechanical properties of each thermoforming condition were verified by bending test. The degree of impregnation of the PET film into the CF mat was evaluated by cross-sectional photographs, whereas the interfacial properties were evaluated by interlaminar shear strength (ILSS). Ultimately, it was confirmed that the thermoforming condition for forming the CF/recycled PET composites yielding the optimal mechanical and interfacial properties was at $270^{\circ}C$ for 5 minutes.

• 재활용회보
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• s.1
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• pp.115-115
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• 2003

• Polymer(Korea)
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• v.34 no.5
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• pp.410-414
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• 2010

Two different types of polymer-modified mortars(PMM) were prepared with recycled PET and fly-ash. One is rigid PMM and the other is flexible PMM which are based on the composition of recycled PET. Their mechanical properties including friction coefficient measurement and damping characteristics such as sound absorption were investigated and compared with the commercial PMM such as epoxy PMM and PET PMM. The result from mechanical properties indicated that the rigid PMM could be competitive with the commercial PET PMM. The measurement of sound absorption coefficient showed that both rigid PMM and flexible PMM had much better damping capacity than commercial PMM. However, the friction coefficient of rigid PMM revealed that it would be suitable for the use as floor material.

• Journal of the Korea Organic Resources Recycling Association
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• v.13 no.1
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• pp.115-123
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• 2005

In this study, life cycle assessment(LCA) technique was employed to evaluate the environmental impact of material recycling of polyethylene terephthalate(PET) bottle. Life cycle inventory was established based on the data collected from recycling companies in Korea. Simapro 5.0 LCA software and Eco-indicator 95 index were used for the analysis. The biggest impact by the material recycling of PET bottle on the environmental category was the global warming. It is because melting and production of the recycled PET product consume a significant amount of electricity and energy. In the environmental pollution discharge, $CO_2$ emission was the highest, followed by NOx. This is probably due to the use of diesel and gasoline in the consumption of electricity and transportation. All the environmental impact showed (-) value except the ozone layer depletion, which means that the material recycling of PET bottle is environmentally fair. The use of recycled PET product greatly reduced the environmental impact.