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도성준,Doh, Song-Jun The Korean Fiber Society 2009 한국섬유공학회지 Vol.46 No.3
The effects of dry processes and wet processes exerted on cotton fibers from harvesting through repeated washing/drying of garments were investigated. Cotton ginning and carding, as dry processes were designed for enhancing fiber alignment as well as cleanliness of fibers to be processed to subsequent processes. However, these processes somehow damage fibers physically. In addition, repeated washing/drying of garments, as wet processes, also results in degradation of fibers within the garments. In this research the effects of these steps on tensile and dimensional properties of fibers. A theoretical structural model was suggested in order to explain the results shown in the research.
도성준,Doh, Song-Jun The Korean Fiber Society 2009 한국섬유공학회지 Vol.46 No.3
Ginning and carding processes, as opening processes of cotton spinning, give both positive and negative influences on tensile properties of cotton fibers. These processes open and clean harvested fibers while result in decrease in breaking strength and breaking elongation of fibers. In this paper the changes in tensile properties from the opening process to steps of repeated washing/drying of garments were measured and analyzed based on the results of tensile tests on individual cotton fibers. We ginned cottons with three ginning rates and analyzed the tensile properties. It seemed that a certain threshold value of processing rate exists for showing critical detrimental effects on breaking strength of individual fibers while higher process rate resulted in increase in breaking elongation. Compared to tensile properties of hand-ginned cotton, processes performed by opening machine damaged tensile properties of fibers significantly. Subsequent processes (carding, before/after garment laundering) in addition to the ginning process also influenced the tensile properties significantly. While the tensile strength of individual fibers decreased during spinning and knitting processes, the breaking elongation decreased significantly during repeated laundering stages. These phenomena can be explained by the fact that dry processes affect tensile strength while wet processes tensile elongation of individual fibers.
에어 덕트용 PET 니들펀칭 부직포의 제조 및 물성에 관한 연구
배영환,도성준,Bae, Younghwan,Doh, Song Jun 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4
An air intake duct is an automotive part for transferring outside air to the internal combustion engine where the air and fuel are mixed and consumed. While this part has been primarily made of engineering plastics, many manufacturers are attempting to apply textile nonwovens due to their superior sound absorbing performance and lightweight characteristics. In this paper, we studied the manufacturing process of needle punched nonwoven fabric and analyzed various properties in order to investigate the applicability of textile nonwoven as a material for automobile air intake ducts. The nonwoven web was prepared by opening, mixing and carding PET staple fibers and binder fibers. The web was physically bonded by the needle punching process. In addition, we applied heated air through the nonwoven web to improve the mechanical properties of the needle punched nonwoven fabrics by the thermal bonding of interlocking constituent fibers. The results of the tensile test of the nonwoven demonstrated that the hot air treatment to the needle punched nonwoven decreased the elongation of nonwoven, which significantly affects the processability of the air duct production process. Also, the porous structure of the nonwoven improved the sound absorbtion property compared to normal PP plastic. Therefore, the air intake duct made of PET needle punched nonwoven could contribute to decreasing the noise level inside automobiles.
Degradation of Poly(lactic acid) and Poly(butylene adipate-co-terephthalate) Blends in Compost
임정남,도성준,김윤진,유중조,Im, Jung Nam,Doh, Song Jun,Kim, Yoon Jin,Yuu, Jungjo The Korean Fiber Society 2015 한국섬유공학회지 Vol.52 No.5
Geotextiles are used extensively to protect soil from erosion. In this study, we evaluated the mechanical properties and degradation behaviors of poly(lactic acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends. The incorporation of PBAT to PLA decreased the tensile strength and modulus but increased the elongation at break of the blends. Tensile strength and elongation of the PLA/PBAT blend resins were dramatically improved by incorporating a chain extender. When PLA/PBAT blends were composted under $35^{\circ}C$, 90% RH conditions, they showed two-stage degradation and completely lost their mechanical properties after 40 weeks. The PBAT-dominant blend (PLA/PBAT 40/60) showed slightly slower degradation than the PLA-dominant blend (PLA/PBAT 60/40).