• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 추계 학술발표회
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• pp.1456-1462
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• 2008

This study conducted a direct shear test to evaluate friction properties on contact surface of waste resources including turban shell, gastropod shell and PET bottle film. The contact surface that was considered for computation of shear strength in contact surface were turban shell/turban shell, gastropod shell/gastropod shell, and PET bottle film/PET bottle film. As a result of test, friction angle was found to be $16.7^{\circ}$ for contact surface of turban shell/turban shell, $35.4^{\circ}$ for gastropod shell/gastropod shell, and about $11^{\circ}$ for PET bottle film/PET bottle film. Using the results, the author aims to provide a possibility for application of waste resource in the field.

• 자원리싸이클링
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• 제17권1호
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• pp.43-50
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• 2008

본 연구에서는 마찰하전형정전선별법을 적용하여 폐플라스틱 맥주병(PET, Nylon)의 재활용을 위한 재질분리 연구를 수행하였다. 하전재질 선정을 위한 하전특성 연구결과, PMMA가 폐플라스틱 맥주병(PET, Nylon)의 재질분리에 가장 효과적인 하전재질로 확인되어, PMMA를 사용한 pipe line와 cyclone 하전장치를 개발하였다. 본 연구에서 개발된 pipe line과cyclone 하전장치를 이용한 재질분리 실험결과, 최적 실험조건에서 PET의 품위와 회수율이 각각 99.6%와 88.2%인 결과를 얻어, 폐플라스틱 맥주병(PET, Nylon) 재활용을 위한 재질분리 기술을 확립하였다.

• 한국포장학회지
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• 제30권1호
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• pp.31-42
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• 2024

This review paper provides a detailed analysis of PET (polyethylene terephthalate) bottle recycling in Japan. Japan is a global leader in PET bottle recycling due to its advanced regulatory framework and proactive industry initiatives. Japan's success attributes to the widespread adoption of bottle-to-bottle recycling, driven by the beverage industry's commitment to sustainability. By utilizing post-consumer PET bottle recovery and food-grade mechanical recycling technologies, Japan has achieved significant milestones in PET bottle recycling. This paper examines regulatory frameworks, collection systems, reprocessing facilities, and food safety assessments to highlight Japan's innovative approaches to PET bottle recycling and their impact on global sustainability efforts. Drawing parallels with Korea's early stages of PET recycling, it suggests involving major beverage companies and re-evaluating regulations to promote bottle-to-bottle recycling. The focus is on the implications for Korea to promote circular economy principles in plastic recycling.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.631-636
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• 2002

This study shows basic data for using as the structural lightweight aggregate. This will be the procedural method of recycling environmental close waste PET bottle lightweight aggregate(PBLA) that is rapidly increased the amount of production of waste PET bottle recently, the quality of developed PBLA and the fundamental properties by analyzing of mortar containing with PBLA. After experiment, the result shows the PBLA quality that have oven dry specific gravity of 1.39, unit volume weight of 844 kg/m$^3$ and absorption rate of 0% is satisfied with qualify regulation of lightweight aggregate. The flowability of mortar containing PBLA is increased maximum 16% with increasing mixing ratio of PBLA, however the compressive strength of mortar is decreased maximum 35% with increasing mixing ratio of PBLA.

• 한국포장학회지
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• 제15권3호
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• pp.105-111
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• 2009

In this work, source reduction of poly ethylene terephthalate (PET) packaging are discussed as aspect of sustainability, such as reuse, refill and recycling through the various treatment methods and historical studies for municipal solid waste (MSW) disposal. Since PET has good chemical, physical and mechanical properties, and provides good oxygen and carbon dioxide barrier properties, PET is one of the most widely used thermoplastic polyester in the U.S. and around the world. As the demand for non-renewable PET is increasing, several approaches have been developed to meet economical feasibility and environmental responsibility without degrading material performance. Several companies, such as Coca-Cola Co., Easterform Packaging Co. and Kraft, have tried to develop lightweight PET bottle, and some of lightweight PET bottles are already commercialized. Reuse and refilling for PET container is well developed in Europe, such as Denmark, German and Netherland by supportive legislation and policies. Recycling process is the best way to economically reduce PET waste. In consequence, advanced technique and further development must be provided due to increasing PET packaging waste.

• Advances in concrete construction
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• 제12권6호
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• pp.461-467
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• 2021

Polyethylene-terephthalate (PET) from bottle waste and linear low-density polyethylene (LLDPE) from barrels and tanks waste are widely available and need to be recycled. Recycling them in concrete and mortar is an alternative solution for their disposal. In this study various quantities of sand (5%, 10%, 15% and 20%) were substituted by powder from LLDPE waste. In addition, PET waste fibers (corrugated, straight) were added to the mortar with different percentages (0.5%, 1%, 1.5% and 2%) of cement mass. This paper evaluate the mechanical and physical properties of the composites in fresh (workability, air content and density) and hardened state (compressive and flexural strength, water absorption and total shrinkage). From the experimental results, it can be concluded that the strengthening in tensile of the mortar with plastic waste corrugated fibers is improved. Other important results are that the water absorption and the density rate are less than that of the ordinary mortar.

• 자원리싸이클링
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• 제12권5호
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• pp.16-22
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• 2003

폐 PET 병을 재가공하여 콘크리트용 경량골재(LAPET)로 제조하였으며, LAPET의 품질 및 LAPET사용 모르터의 물성에 대하여 검토하였다. LAPET의 비중 및 단위용적 중량이 각각 1.39 및 844 kg/㎥로 강모래에 비하여 매우 작으며, LAPET의 혼합률이 클수록 골재의 비중이 작아지므로 강도가 크게 떨어졌으나, LAPET를 25 및 50%로 혼합한 경우 재령 28일 압축강도는 30 MPa 이상의 강도를 발현하였다. LAPET의 입형은 대부분이 일정한 형대로 둥근 모양을 지니고 있었으며, 표면조직이 매끄러워 모르터의 유동성을 크게 향상시켰다. 한편, LAPET가 단입도로 구성되어 있어 모르터의 모세관 흡수량은 LAPET를 혼합하지 않은 모르터에 비하여 크게 나타났다. LAPET의 내부구조는 유기질 계통의 고분자 재료인 PET로 구성되어 있어 흡수율이 0％이므로 일반 경량골재의 단점을 개선하는 효과가 있었으며, LAPET를 경량콘크리트용 골재로 재이용하게 되면 폐 자원 재활용 및 환경오염을 미연에 방지하는 일석이조의 효과가 기대된다.

• 대한토목학회논문집
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• 제28권3A호
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• pp.401-406
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• 2008

본 연구에서는 폐 PET병을 사용하여 구조적으로 효과가 있는 재생 PET섬유를 생산하였고 세 가지 형상의 재생 PET섬유와 시멘트 매트릭스와의 부착성능을 평가하였다. 또한 세 가지 형상의 재생 PET섬유로 보강된 콘크리트의 휨성능 시험을 실시하였다. 시험결과 재생 PET섬유는 우수한 부착성능의 증가를 보여주었다. 휨시험 결과 재생 PET섬유는 콘크리트의 휨인성을 증가시킨다는 것을 증명하였다. 부착 및 휨시험 결과를 기본으로 요철형 재생 PET섬유의 부착 및 휨성능이 다른 형상의 섬유와 비교하여 가장 우수하였다.

• 콘크리트학회논문집
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• 제19권2호
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• pp.233-239
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• 2007

본 연구의 주요 목적은 시멘트 복합 재료의 소성 수축 균열 제어에 폐 PET병으로부터 만들어진 재생 PET 섬유의 효과를 평가하는 것이다. PET은 플라스틱 재료라 알려진 재료로 음료수 병 등에 다양하게 적용되어 왔다. 그렇지만 폐 PET 병은 사용 후에 환경적 측면에서 큰 문제점으로 부각되고 있다. 따라서 폐 PET 병을 재활용하는 방법에 대한 연구는 환경 및 경제적 측면에서 중요하게 되었다. 폐 PET 병을 재활용하는 방법 중 시멘트 복합 재료의 보강 섬유로 사용하는 방법은 효과적인 방법 중에 하나이다. 본 연구에서는 시멘트 복합 재료의 소성 수축 균열에 재생 PET 섬유의 형상 및 길이의 효과를 얇은 슬래브 실험을 통해서 조사하였다. 실험 계획은 섬유의 형상, 길이 및 혼입률의 영향을 이해하기 위하여 수행하였다. 재생 PET섬유의 형상은 straight, crimped및 embossed type의 3가지 형상을 포함하며, 각 3가지 섬유형상 마다 3가지 수준의 섬유 혼입률 및 2가지 종류의 섬유 길이에 대해서 조사하였다. 실험 결과 재생 PET섬유는 시멘트 복합 재료의 소성 수축 균열에 효과적이었다. 섬유의 길이의 관점에서 길이가 긴 섬유는 섬유의 형상이 동일할 때 섬유체적비가 적을 때 효과적이며, 섬유체적비가 증가하면 길이가 짧은 섬유가 더욱더 효과적이었다. 또한 embossed type의 섬유는 적은 섬유 혼입률에서 다른 형상의 섬유보다 소성 수축 균열 제어 효과가 우수하였으며, 높은 섬유 혼입률에서는 straight type의 섬유가 다른 형상의 섬유보다 시멘트 복합 재료의 소성 수축 균열 제어에 가장 효과적이었다.

• Design & Manufacturing
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• 제17권4호
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• pp.33-41
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• 2023

Excessive use of plastic bottles contributes to a significant environmental issue due to the high volume of plastic waste generated. To address this, efforts are needed to reduce the weight of plastic bottles. However, indiscriminate weight reduction may compromise the essential rigidity required for plastic bottles. Extensive research on rib shape for pressure vessels are exists, but there is a few research of rib shapes to enhance the stiffness of plastic bottles. The following results were obtained from the analyses conducted in this study. 1) Among the rib cross-sections of square, trapezoid, and triangle, the buckling critical load of PET bottles with square-shaped ribs is improved by about 14% compared to the buckling critical load of PET bottles without ribs. 2) The buckling critical load is improved by about 18% when a square-shaped rib with an aspect ratio of 0.2 is applied, compared to the buckling critical load of the bottle without the rib. 3) When longitudinal and transverse square ribs were applied to the axial direction of the PET bottle, the buckling critical load was improved by about 32% and 58% compared to the buckling critical load of the PET bottle without ribs, respectively, indicating that applying longitudinal ribs is effective in reinforcing the stiffness of PET bottles. 4) When 14 transverse ribs were applied, the maximum improvement was about 48% compared to the buckling critical load of the plastic bottle without ribs. 5) When 3 longitudinal ribs were applied on each side, the maximum improvement was about 76% compared to the buckling critical load of the bottle without ribs. Therefore, it was concluded that for effective stiffness reinforcement of a 500ml square bottle with a thickness of 0.5mm, 3 square-shaped ribs with an aspect ratio of 0.2 should be applied in the longitudinal direction relative to the axial direction of the bottle.