• 자원리싸이클링
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• 제6권2호
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• pp.42-46
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• 1997

PET병은 투명성, 경량성, 안전성, 내약품성 등이 우수하여 94년 현재 약 1,330 백만개가 사용되었으며 연평균 20%의 증가율을 나타내고 있으며 국내 PET병의 재활용율은 약 3%로 재활용체의 영세성, 시장변동 및 기술개발능력 부족 등의 문제를 안고 있다. PET병의 재활용기술은 Hydrocyclone process, Flotation process, Solution washigng process 등이 있으며 PET병을 생산하고 있는 삼양사에서는 Solution washing process를 도입하여 처리량 8,000 톤/년의 재활용 공장을 가동하여 재생 fiber용 뿐만 아니라 포장재용 등에 사용 가능한 재활용 제품을 생산하고 있다.

• 에너지공학
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• 제28권1호
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• pp.45-48
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• 2019

Currently, the global atmosphere around the world is altering at a very rapid pace. Among those changes, some are beneficial, but most of the changes are lead to destruction to our planet. The area of environmental science is a significant resource for learning more about these changes. Due to the urbanization, the human population is increasing, natural resources becoming very limited. To solve the limited resources issues, recycling is absolutely an alternative source for the new demands and limitations. Recycling education is very important to raise awareness among students and their communities about the need for recycling and what materials are recyclable locally. In this paper, we reported the role of sustainability science and technology and the impact of recycling research education in the middle schools, both in developing countries and Asian countries and also we included the brief data of global recycling of waste.

• 자원리싸이클링
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• 제5권4호
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• pp.3-10
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• 1996

• 펄프종이기술
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• 제43권3호
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• pp.11-20
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• 2011

The conditions to which pulp fibers are exposed during paper production, converting, storage, use, and recycling can induce various changes in fiber morphology, surface characteristics, and suitability for paper production by recycled fibers. Most of those changes can be described by hornification. Paper has highly hygroscopic properties which affect dimensional change by relative humidity variation of surrounding condition. The purpose of this study was to investigate the dimensional stability, moisture contents and dip elongation of handsheets at different relative humidity conditions of recycled kraft pulp and BCTMP. By using recycled fibers, dimensional stability was increased because hygroscopic properties of fibers decreased with repeated recycling treatment. Dip elongation of recycled pulp was higher than that of virgin pulp because of its weak fiber-to-fiber bonding. By recycling pulp, the relative bonded area was decreased because fiber could not swell more than virgin pulp. Dimensional stability largely depended on the equilibrium moisture contents of paper, the fiber-to-fiber bonding strength, and the relative bonded area.

• 펄프종이기술
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• 제47권1호
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• pp.52-58
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• 2015

White ledger usually includes white office paper, computer paper, and copy machine paper. Because these grades need high optical properties, fluorescent whitening agents (FWAs) are widely used in the papermaking process. FWAs are the most powerful and effective chemical used to obtain high CIE whiteness and ISO brightness in papers. The rising demand for white or ultra-white papers has increased the use of FWAs. However, FWAs used in white ledger can restrict its use, even though white ledger is widely used as a raw material in paperboard mills. Therefore, it is necessary to develop methods to control FWAs from white ledger to increase its use in paperboard mills. In this study, the behaviors of disulpho fluorescent whitening agent (D-FWA), tetrasulpo fluorescent whitening agent (T-FWA), and hexasulpho fluorescent whitening agent (H-FWA) during the recycling process were identified as a first step to remove FWAs from white ledger. We prepared four types of papers (dyed with D-FWA, T-FWA, and H-FWA), disintegrated these papers, and made handsheets. This recycling process was carried out three times in a laboratory. After each round of recycling, the hand-sheets' CIE whiteness and fluorescence index were measured, and the distribution of FWAs in the Z-direction was observed using CLSM images. FWA reductions in the model papers were calculated using fluorescence indices as a function of the number of recycling. FWAs in handsheets containing T-FWA and H-FWA decreased linearly as a function of the number of recycling, but D-FWA did not show a significant reduction in the fluorescence index after recycling. T-FWA and H-FWA showed similar distributions of D-FWA after recycling. Therefore, as much T-FWA and H-FWA as possible must be detached in the early processes of papermaking at paperboard mills.

• 한국포장학회지
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• 제4권2호
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• pp.24-32
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• 1998

인쇄하지 않은 복사용지에 대해 침지, 탈수, 건조등 일련의 리사이클링 사이클의 반복횟수에 따라 얻어지는 재생지의 광학적 성질의 변화와, 리사이클링 횟수를 달리한 펄프를 이용하여 고지를 제조한 후 하여 고지의 탈묵성 변화를 살펴보았다. 그 결과, 리사이클링 횟수 증가에 따라 얻어진 재생지의 백색도는 원래보다 약10% 저하되었으나, 섬유간 결합감소에 따른 비산란계수의 증가로 불투명도는 약10%정도 증가하는 경향을 보였다. 또한, 리사이클링 횟수에 따른 고지의 탈묵성은 섬유의 표면 자유에너지 감소, 즉 섬유의 소수화 증가로 인하여 약간 저하되는 것으로 나타났다.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2003년도 추계정기총회 및 국제심포지엄
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• pp.165-169
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• 2003

Current volume reduction methods for wasted expandable polystyrene (EPS) foam are summarized and compared each other. Wasted EPS foam has not been recycled effectively because of its large volume to weight ratio. This has prevented from its proper recycling because of high cost of transportation to recycling plant. Successful recycling of wasted EPS foam results directly from successful, i.e. economically and environmentally, volume reduction of wasted EPS foam. This paper deals with various methods for volume reduction methods of wasted EPS foam. Five typical methods of volume reduction are introduced and they are compared each other in terms of expected PS properties after volume reduction, cost effectiveness of each process, possible effects on environment caused by the volume reduction process, and possible recycled products. The methods include thermal, solvent, far infrared and mechanical compaction. Comparison in this paper is made mostly in qualitative manner. The focus in this study is concentrated on summarizing and comparing existing methods of volume reduction for wasted EPS foam.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2005년도 추계학술대회
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• pp.411-417
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• 2005

In the last year, the number of registered vehicles in Korea surpassed the 15 million mark, and increase in number continuously. Nowdays, this tendency has raised some problems inevitably in the view of expansion of ELV(End of Life Vehicles) and earth environment pollution resulted from it. A foreign country is strengthening law about a car recycling for to solve this problem. Car recycling technology in Japan was introduced in this paper.

• 자원리싸이클링
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• 제23권3호
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• pp.71-77
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• 2014

초임계 유체공정 및 반응상용화에 의한 불융/불용성 폐플라스틱 재활용은 다양한 분야에서 응용이 가능하며, 고부가가치의 신제품생산과 연계하여, 국내 유화산업의 국제 경쟁력 확보가 가능하다고 판단된다. 본 연구에서는 초임계유체를 이용하여 불융/불용 폐플라스틱의 자원순환기술에 대한 특허와 논문을 분석하였다. 분석범위는 1993년에서 2012년까지의 미국, 유럽연합, 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였으며, 기술의 정의에 의해 필터링하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술 등에 따라 분석하여 고찰하였다.

• 자원리싸이클링
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• 제20권5호
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• pp.16-33
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• 2011

E-waste는 종류가 많고 유통경로가 다양하여 눈에 보이지 않는 흐름이 주류를 형성하고 있다. E-waste에는 레어메탈의 사용이 많을 뿐 아니라 유해한 중금속도 함유되어 있어 자원확보면에서, 환경오염방지면에서 재자원화 처리가 필수적이며 정확한 재자원화 물질흐름의 분석이 요구되고 있는 실정이다. 이러한 관점에서 2008년 1월부터 실시한 "전기 전자제품 및 자동차의 자원순환에 관한 법률" 중에서 E-waste와 관련된 법률내용의 골자, 리싸이클링시스템, 리싸이클링현황, E-waste 배출량 추정과 물질흐름 및 PCB의 경제학을 논하였다. 그리고 현시점에서 한국의 E-waste 재자원화산업을 약술하였다.