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Yun, Changsang,Park, Chung Hee Sage Science Press 2015 Textile Research Journal Vol. No.
<P>Fabric movements in a front-loading washer were observed at various conditions with respect to the type of fabric, the number of sheets, the fabric size and the wash spin speed in order to examine their effect on washing efficiency. Fabric movements were categorized into sliding, falling and rotating, which were expected to be influenced by the balance among the centrifugal force, the frictional force and the gravitational force. With increasing the number of sheets, the fabric size and the wash spin speed, fabrics had a tendency to move a longer distance along the drum wall, and thus the most frequent movement shifted from sliding or falling to rotating. The fabric movement patterns during the washing process that were varied according to the washing conditions had a direct effect on washing efficiency. The complex movement pattern, which showed the movements of sliding, falling and rotating by turns during the washing process, exhibited higher washing efficiency than the single movement pattern that represented only sliding or rotating repeatedly.</P>
Yun, Changsang,Park, Chung Hee SAGE Publications 2016 Textile Research Journal Vol.86 No.6
<P>The objectives of this study were to investigate the correlation between fabric movement and washing efficiency in a front-loading washer and to make an algorithm for improving washing efficiency by optimizing fabric movements. A regression model between fabric movement and washing efficiency was made using 14 movement indexes. The angle change of the fabric gravity center, the speed difference between the drum and the fabric, and the shape factor were found to be determining factors for washing efficiency. Various kinds of wash spin speed were employed for making a complex movement algorithm, since it was found that turbulent or complex movement improves the washing efficiency. The optimal algorithm saved energy (25%) and time (27%), as well as achieving higher washing efficiency (4.8%).</P>
세탁 및 건조과정에 의한 스판덱스 혼방 직물의 변형 비교
윤창상 ( Changsang Yun ),고예린 ( Yerin Ko ),송경희 ( Gyeong Hee Song ),신효담 ( Hyodam Shim ),박정희 ( Chung Hee Park ) 한국의류학회 2017 한국의류학회지 Vol.41 No.3
There is increased interest in clothes dryers and garments made of spandex-blend woven fabrics; however, there is limited information available for the laundering and drying these clothes. This study investigates the effects of washing and drying on shrinkage, skewness, and wrinkle for woven fabrics with and without spandex. When spandex with good elastic recovery was blended, the deformed shape from washing and drying improved skewness and wrinkle by easily returning to its original shape. However, these properties had a negative effect on shrinkage in terms of length and area change. When the influence of clothes maintenance was classified, the drying process had the biggest influence of 58%, followed by spinning-rinsing-washing. Tumble drying, in which the fabric is exposed to mechanical force and heat for a long period, had more negative effects on the dimensional stability than line drying. The spandex blend had the effect of preventing skewness and wrinkle in garments, but it was also shown to accelerate shrinkage by garment main-tenance cycles. It was important to control drying in order to reduce shrinkage during the maintenance pro-cess; consequently, this had the greatest influence on the dimensional stability of fabrics. Therefore, line dry-ing was more advantageous for spandex-blend fabrics than tumble drying in terms of management for shrin-kage, skewness, and wrinkle.
의류제품의 세탁조건과 지속가능성: 세탁온도와 세탁시간을 중심으로
윤창상 ( Changsang Yun ),류한나 ( Hanna Ryu ),박소현 ( Sohyun Park ) 대한가정학회 2018 Human Ecology Research(HER) Vol.56 No.5
The use stage of a textile product impacts sustainability more significantly than other stages of the product’s life cycle due to repeated washing and drying. This study determines efficient washing conditions, with high detergency, to reduce energy consumption from excessive washing and improve the washing process sustainability. Detergency was measured at various washing temperatures (20°C, 40°C, and 60°C) and time (10 min, 20 min, and 30 min) using standardized soiled fabrics, i.e., 100% cotton, polyester/cotton (65%/35%), and 100% polyester woven fabric soiled with pigment/sebum, carbon black/mineral oil, soot/mineral oil, cocoa, blood, and red wine. Detergency at the washing condition of 20 ℃ and 30 min was higher than that at 40 ℃ and 10 min. In addition, detergency at the condition of 40 ℃ and 30 min was also higher than that at 60 ℃ and 10 minutes. This may be because a reduced washing effect at low washing temperatures was complemented by increased mechanical action over a long time. Further, washing temperature and time, with the same detergency, differed based on the type of fiber and soil. Also, the influence of a detergent on the detergency depends on the type of soil. The results suggest that energy and detergent have been consumed more than necessary in actual laundry. According to each type of fiber and soil, washing conditions designed to reduce the energy consumption of the washing process while maintaining the same detergency, were determined.
Jiyul Lee,Changsang Yun,Chung Hee Park 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
The movements of clothes in a tumble dryer were analyzed according to fabric characteristics and drum rotationspeeds, along with their effects on drying performances. Furthermore, regression models of the fabric characteristics inrelation to their movements and drying performances were developed. When the drum rotation speed was increased from 35to 50 rpm, dynamic movements were observed at the center of the drum, and the movement ranges continued to expand. However, at 65 rpm, the rotation of clothes occurred primarily along the drum wall. Based on these observations, clothingmovements were categorized into four patterns. In addition, the clothing movements in the dryer were found to be completelydifferent from those in the washer owing to the differences in their internal environment (i.e., the drum and water,respectively). Therefore, seven movement indices were newly introduced for the dryer. Drying rates, shrinkages and gradesfor the smoothness appearance of the clothes tended to decrease in the order of drum rotation speed (i.e., 50 > 35 > 65 rpm),with the exception of polyester shirts. Typically, the cotton samples exhibited lower drying rates and smoothness appearancegrades with higher shrinkage rates than the polyester samples. Moreover, compared to dress shirts, T-shirts showed highershrinkage rates and smoothness appearance grades. Although the standard moisture regain of the fabric significantly affectedthe drying rate, shrinkage was highly influenced by the elongation and standard deviation of the moving distance from thecenter of the sample between frames. The smoothness grade was significantly affected by the number of tumbles.
웨어러블 디바이스를 위한 은 나노와이어 코팅 전도사 개발
김지민 ( Jimin Kim ),윤창상 ( Changsang Yun ) 한국의류학회 2021 한국의류학회지 Vol.45 No.4
Recent advances in electronic technology have engendered a need for research on the use of smart materials in clothing. Electro-conductive fibers are expected to be a crucial element of wearable devices. Therefore, in this study, we have attempted to develop electro-conductive threads and cables using silver nanowires. Based on the characteristics of silver nanowire, in which electro-conductivity can be imparted via heat treatment, we prepared conductive threads by coating nylon yarn with silver nanowires and curing at temperatures of 140°C, 150°C, and 160°C. Conductive threads cured at 140°C had the highest conductivity, followed by threads cured at 160°C and 150°C respectively. The order of the electrical conductivity of the threads after tensile testing was consistent with the original order of the conductivity of the threads. When we evaluated the sensing performance of electro-conductive cables fabricated from these threads, the cables manufactured from threads cured at 140°C and 160°C were found to function normally within temperature and humidity sensors. All the cables operated normally in illuminance and electrocardiogram sensors. Thus, we believe that threads made of silver nanowire have sufficient electrical conductivity to be utilized as wearable sensors.