• 자원리싸이클링
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• 제11권1호
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• pp.37-42
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• 2002

This study was conducted in order to remove Poly vinyl chloride(PVC) from the waste plastic film mixture. The fittings of Air Table was modified to increase the separation efficiency of PVC and PE(poly ethylene). PE and PVC was successfully separated from PVC-PE film mixture with the yield of PE 90% or more and with his grade of 99% or more, using the improved Air Table. The details of the separation condition and results will be discussed in this paper. Dry separation, Waste plastic film, PVC, Air Table. The details of the separation condition and results will be discussed in this paper.

• Applied Biological Chemistry
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• 제13권2호
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• pp.131-151
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• 1970

A new method of plastic film coating has been investigated to extend storage life of apples. The film coating was effected by dipping fresh apples in a plastic emulsion. The effect of plastic film coating on the preservation of freshness, respiratory activities and chemical components during storage, has been investigated on four leading varieties of apples. The results are summarized as follows: 1. The effect of film coating on storage life of apples was apparent, resulting in delay of after-ripening, shriveling, softening or physiological impediment as well as reducing consumption of reserve materials and waste fruits. 2. Change in the partial pressure of gas, i.e., increase in carbon dioxide and decrease in oxygen in apple tissue was resulted by the plastic film coating, suggesting that the film deposited on the fruit interfered with the diffusion of gases formed therein. 3. The effects of plastic film coating on the fruit storage varied with the type of plastic emulsions, coating temperature, varieties of apples and degree of fruit ripening. As regard to apple varieties, good results were obtained with PVA 217 for both American Summer Pearmain and Jonathan, and PVC 443 for McIntosh. 4. Reduction in the diminution rates of L-malic acid, ascorbic acid and soluble pectin etc. during storage of apples may account for the improved storage life of the fruits treated with plastic films.

• 자원리싸이클링
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• 제27권4호
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• pp.3-15
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• 2018

플라스틱은 용기, 포장재, 필름 등 다양한 분야에서 사용이 증가하고 있으며, 플라스틱 사용의 증가에 따라 폐플라스틱의 발생도 증가하고 있는 추세이다. 국내의 폐플라스틱은 폐기물 부담금, 생산자책임재활용제도와 자발적 협약 등의 제도에 의하여 관리되고 있다. 최근 폐플라스틱 수거업체에서의 수거 거부에 의한 문제에 대응하기 위하여 환경부에서는 제조 생산 - 분리 배출 - 수거 선별 - 재활용의 순환주기에 따른 재활용 폐기물 관리 종합대책을 발표하였다. 이러한 폐플라스틱 관리에 대하여 국내 폐플라스틱 관리현황과 환경부의 대책을 검토하여 폐플라스틱의 순환주기에 따른 개선방안을 제시하였다.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2003년도 추계정기총회 및 국제심포지엄
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• pp.116-121
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• 2003

In this study, the thermal degradation process has been investigated at various reaction temperature$(350{\sim}400^{\circ}C)$ and times$(30{\sim}120\;min)$ in order to recycle waste plastic films as solid state wax. Waste plastic films were easily melted by adding a small amount of waxes. The effects of wax addition and nitrogen flow rate on their thermal degradation properties were investigated. FT-IR, GPC and viscometer were used to analyze properties of the solid wax including the structure, molicular weight distribution and melt viscosity. The average molecular weight of solid wax was decreased with increasing the reaction time, temperature and amount of wax added, Also, the viscosity of solid wax decreased with increasing the stirring speed at a constant reaction temperature and time, and its viscosity got close to zero above $390^{\circ}C$.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.734-737
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• 2001

A study was conducted in order to remove PVC from the waste plastic film mixture. The fittings of Air Table was modified to increase the separation efficiency of PVC. By using the improved air table, the PE and PVC was successfully separated from PVC-PE film mixture with the yield of PE 90% or more and with the content of PVC in PE 1% or less. The detail of the separation condition and result will be discussed in this paper.

• 공업화학
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• 제28권1호
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• pp.23-28
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• 2017

열중량 분석기와 파이롤라이저-가스크로마토그래피/질량분석기를 이용하여 폐플라스틱 필름의 열분해 특성연구를 수행하였다. 열중량 분석 결과, 최근 사용량이 증가된 녹말 첨가 바이오 플라스틱의 영향으로 폐플라스틱 필름의 열분해는 $200^{\circ}C$에서 $370^{\circ}C$ 사이의 녹말 분해구간과 $370^{\circ}C$에서 $510^{\circ}C$ 사이의 PS, PP, PE와 같은 플라스틱계열의 고분자 분해구간을 가지는 것을 확인할 수 있었다. Revised Ozawa method를 이용한 동역학 분석 결과 폐플라스틱 필름의 열분해 반응 활성화 에너지는 녹말과 플라스틱계열 고분자의 다른 분해 반응에 의해 급격하게 변화되었다. 파이롤라이저-가스크로마토그래피/질량분석 결과 폐플라스틱 필름에 포함된 각 고분자의 열분해 부산물인 levoglucosan (녹말), terephthalic acid (PET), styrene monomer/dimer/trimer (PS), methylated alkenes (PP), alkadiene/alkene/alkane으로 구성된 triplet 피크 (PE)가 나타남을 확인할 수 있었다. 또한 고분자 첨가제로 사용되는 프탈레이트 성분도 검출되었다.

• 한국잠사곤충학회지
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• 제43권1호
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• pp.41-48
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• 2001

The purification, dissolution and powdering of stained waste silk obtained from weaving and dyeing process were studied for the surface modification of textile fabric and plastic materials. The whiteness of stained waste silk could be improved through degumming and bleaching with sodium hydrosulfite. The water-soluble fibroin solution can be obtained by dissoving the degummed waste silk in a boiling solution of 50% calcium chloride for 60 minutes. The salts and heavy metals contained in fibroin solution were removed by electric dialysis, wool fiber filtration and gel filtration chromatography. The fibroin powder was prepared by using a fine grinder after the alkali treatment for weakening the silk fiber. The fine fibroin powder of particle size around 30 ㎛ was obtained with a ultra fine-mill, while it was finer below 10 ㎛ with a ball-mill. The dissolved or powdered silk was applied to the surface of fabric with addition of the binder (a urethane resin). The moisture content of polyester and nylon fabrics treated with the silk solution was improved due to hygroscopic property of silk. The fine fibroin powder mixed with the binder ws coated on the surface of synthetic film by use of the air pressed sprayer. It was revealed that the hygroscopicity as well as the softness of fibroin powder coated film was much improved. Therefore, it is thought that the fine silk fibroin powder is applicable as an coating agent for the surface modification of plastic and synthetic leather.

• 인간식물환경학회지
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• 제24권2호
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• pp.195-207
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• 2021

Background and objective: While response measures to particulate matters in rural areas are limited due to poor inventory record keeping in the agricultural sector, it is necessary to control agricultural waste vinyl and the emission of precursors released from open burning and the secondary generation of particulate matters. Currently, the open burning emission calculation method uses the definition prescribed in CAPSS by the National Institute of Environmental Research. Methods: This study presented an open burning emission calculation formula for agricultural waste vinyl, which is included as agricultural waste. As for activity data, the open burning ratio of agricultural waste vinyl, and the annual incineration volume provided in the Status Survey by the Ministry of Agriculture, Food, and Rural Affairs were applied. The emission factor was generated through incineration tests on three agricultural plastic film samples collected by the Korea Environment Corporation. Results: Among precursors, SOx and NOx were selected and their emission features were monitored with incineration experiment infrastructure based on the EPA 5G method. The highest emission concentration by agricultural waste type was concentrated in the first and second quarters. As for emission factor of SO₂, it was calculated at 98.25 g/kg for mulching-use LDPE, 52.31 g/kg for greenhouse-use LDPE, and 14.40 g/kg for HDPE. As for NOx, it was calculated at 18.21 g/kg for mulching-use LDPE, 16.49 g/kg for greenhouse-use LDPE, and 10.67 g/kg for HDPE. Conclusion: This test confirmed the incineration features of PE-based plastics, ascertained the SOx emission factor that had not been included in open burning in the past, and established that low NOx emission concentration is interfered by soil mixed with livestock excretions. The findings from this study are expected to contribute to improving the system for controlling air pollutants in rural environments.

• 한국포장학회지
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• 제27권3호
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• pp.169-174
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• 2021

우리나라가 1인당 플라스틱 년간 소비량이 132 kg(2019)으로 세계1위로 나타났고, 지구온난화와 탄소중립을 위한 국제적 협약이 진해되고 있으며 소비자들도 바이오플라스틱에 대한 관심과 니즈가 증가하고 있어, 바이오플라스틱 소재에 복합 사용화 첨가제를 농도별로 첨가하여 필름을 생산 시 토출량, 용융지수, 인장강도 변화를 조사하였다. 석유계 수지인 LLDPE와 LDPE보다 PLA와 PBAT에서 용융지수가 현저히 높은 것으로 나타났으며 동일 수지나 동일 처리구에서는 heating temperature가 증가함에 따라 용융지수가 증가한 것으로 나타났다. 상용화제 4%를 첨가한 BDP-2 처리구에서 토출양도 비중도 우수한 것으로 조사되었으며, MD 및 TD 방향의 인장강도도 높게 나타나 BDP-2가 복합화 생분해 필름 제조용 제조 방법으로 가장 적합한 것으로 사료되었다.

• 자원리싸이클링
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• 제32권3호
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• pp.57-67
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• 2023

폐플라스틱에 대한 국가 간 수출입 제한에 따라, 폐플라스틱의 국내 처리 및 재활용 방안을 모색할 필요성이 커지고 있다. 본 연구에서는 국내 A 기업의 폐필름 발생 현황 및 운영 정보를 참고하여 가구 표면 마감용 sheet 및 edge 제조시 발생하는 PET·OPP 합성 폐필름의 재활용사업에 대한 비용 편익을 분석하였다. 폐플라스틱 처리는 그간 영세업체에 맡겨져 현황 파악이 어렵고 수익성 담보가 되지 않아, 재활용 기술이 있더라도 활용되기에 어려움이 따랐다. 본 연구에서는 폐플라스틱 물질 재활용 방안의 하나로써, 폐필름 발생 사업장에서 PET·OPP 합성 폐필름을 박리하여 폐PET 재활용이 이루어지는 것으로 가정하되, 재활용 비율은 정부가 「전주기 탈 플라스틱 대책」에서 제시한 수치를 활용하여 2%, 10%, 20%, 30% 재활용할 경우 비용편익을 분석하였다. 본 연구에서는 폐PET 재활용 방안으로 물리적 박리 기술이 도입되는 것으로 가정하여 폐PET 재활용 비율에 따른 비용편익분석을 수행하였다. 그 결과 폐PET의 재활용 비율이 30% 이상일 경우에만, 비용 편익비율(Benefit-cost ration, BCR)이 BCR ≥1 에 해당하여 최소비용 편익비율을 충족하는 것으로 나타났으며 이 때, BCR 값은 1.32였다. 향후 정부의 지원금 할당비율과 단가가 상향될 것으로 예상됨에 따라 비용 편익비율은 더욱 높아질 것으로 사료된다. 해당 사례는 유사 업종의 사업장에 폐PET 재활용 및 수익 창출을 위한 시범 Case가 될 것으로 기대된다.