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레이온 직물의 Wet-Fixation 에 의한 DP 가공에 관한 연구(Ⅰ) : 일욕법과 이욕법의 비교 One Bath and Two Bath Processes
허윤숙,김은애 한국의류학회 1989 한국의류학회지 Vol.13 No.3
The purpose of this study was to investigate the changes in easy-care and strength properties of the wet fixation processed viscose rayon fabrics. Rayon fabrics were treated with mixed resins of melamine formaldehyde (MF) and DMDHEU by one bath and two bath wet fixation processes. The MF/DMDHEU mixed resin concentrations were 50/100, 50/150, 100/100, 100/150 and 150/100(g/1). Magnasium chloride was used as a catalyst. Treated fabrics were evaluated by nitrogen content, DP rating, wrinkle recovery angle, breaking strength, tearing strength and abrasion resistance. The properties were compared to the fabrics treated by conventional Pad-Dry-Cure (PDC) method. Wet fixation processed fabrics showed DP ratings of higher than 3 and higher than 275 degrees of wrinkle recovery angles in all the mixed resin concentrations. Wet fixation processed fabrics showed increase in breaking strength and tearing strength but decrease in abrasion resistance. However, the decrease in abrasion resistance was much less than the conventional PDC treated fabrics. The one bath wet fixation processed fabrics showed better physical properties than the two bath processed fabrics in general. The optimum treatment condition was the mixed resin concentration of MF/DMDHEU, 100/100 g/l in one bath wet fixation process.
레이온 직물의 Wet-Fixation 에 의한 DP 가공에 관한 연구 (Ⅱ) : 처리온도 및 시간의 영향 Effect of Treatment Temperature and Time
허윤숙,김은애 한국의류학회 1989 한국의류학회지 Vol.13 No.4
The purpose of this study was to investigate the effects of treatment temperature and time on thelof easy-care and strength properties of the wet fixation processed rayon fabrics. Viscose rayon fabrics were treated with mixed resins of melamine formaldehyde (MF) and DMDHEU by one bath and two bath wet fixation processes. The MF/DMDHEU mixed resin concentrations were 50/100, 50/150, 100/100 and 100/150(g/1). Magnasium chloride was used as a catalyst. The wet fixation conditions were 24hrs at room temperature, 20 mins at 75℃ and 5 mins at 105℃. Wet fixation processed fabrics did not show the difference in the resin add-one, DP ratings and wrinkle recovery angles by the different treatment temperatures and times. DP ratings were in the order of 105℃ > 75℃ > room temp, in one bath and two bath wet fixation. Breaking and tearing strength of one bath processed fabrics showed in the order of 75℃ > room temp > 105℃. The breaking strength of two bath processed fabrics showed in the order of 105℃ > 75℃ > room temp. Tearing strength showed in the order of 75℃ > 105℃ > room temp. Abrasion resistances were in the order of 75℃ > 105℃ > room temp. in one bath and two bath processes.
인간-의복-환경 모델을 이용한 직물의 투습완층능력 평가
허윤숙,유화숙,김은애,Heo, Yun-Suk,Yu, Hwa-Suk,Kim, Eun-Ae 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.2
The purpose of this study was to evaluate the buffering capacity against water vapor of fabrics by using an apparatus that simulated the human-clothing-environment system. The influence of the hydrophilicity of fabrics, thickness of air layer and air flow on the buffering capacity were analyzed. The wear trials were performed to examine whether the buffering capacity index could work as an index to predict the subjective comfort sensation. Polyester and cotton fabrics were used as specimens. The changes of humidity and temperature of air layer in the simplated system were measured and the buffering indices K , K and $\beta$ were determined by considering , , , and tant$\beta$. Results showed that buffering index for polyester was higher than cotton. As the thickness of air layer increased, buffering capacity increased. When there was an air current, buffering capacity increased much higher. In wear trials it was confirmed that the buffering index obtained by the apparatus was in good agreement with the subjective sensation of wetness.
편성물의 섬유의 종류,실의 굵기 및 니트타입에 따른 투습완충능력
김은애,허윤숙,유화숙 한국의류학회 1996 한국의류학회지 Vol.20 No.1
The purpose of this study was to evaluate the effect of chacteristics of knit fabrics on the microclimate of the skin simulating system. To determine the effect of characteristics of knit fabrics, vapor state of sweat pulse was simulated in the closed system. Different contents of fibers such as cotton, wool and polyester with different yarn size and knit types were chosen for specimens. The changes of humidity and temperature of air layer in the simulated systems were measured. Buffering indices, K_d and β_T, were determined by considering α_P, ΔP_max, t_max, and tansβ. Physical properties of knit fabrics such as thickness, porosity, air resistance and moisture vapor transport were measured. Results showed that vapor pressure of wool was lower than cotton or polyester. This was attributed to the hydrophilicity of wool which absorbed moisture rather quickly and retained in the knit fabric. The time to decrease vapor pressure was faster for polyester than cotton or wool. As a result, K_d was in the order of wool>polyester>cotton. β_T of wool was lower than cotton or polyester due to its lower porosity and slower desorption rate. For the yarn size, K_d was in the order of 80's>60's>30's; thinner and lighter yarn showed better water vapor transport property. For knit type, buffering capacity of single jersey was better than interlock knit fabric. Statistical analysis showed that the air permeability was the most influential factor for the water vapor transport properties.
부유물 감김 해양사고 발생 시 토크 증가에 따른 고속 디젤기관 선박 추진시스템 안전성 평가
윤현우,남궁호,허윤숙,송명호 한국기계기술학회 2024 한국기계기술학회지 Vol.26 No.4
Recently marine accidents involving floating objects have been continuously increasing due to domestic coastal traffic conditions, and as a result cases of secondary-linked reduction gear damage have also occurred one after another. This research aims to evaluate the ship propulsion system safety through the analysis the effect of the torsional stress generated on the propeller shaft system when a rope or net is wrapped around a propeller at sea through theoretical analysis, simulation analysis, and ship empirical test.