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초임계 유체 염색용 염료에 따른 면 섬유의 염색 특성 : C.I. Disperse orange 155, C.I. Disperse red 167
최현석,김훈민,전태영,Choi, Hyunseuk,Kim, Hunmin,Jeon, Taeyoung 한국염색가공학회 2022 韓國染色加工學會誌 Vol.34 No.2
In this study, the dyeing properties of supercritical fluid dyed cotton fabrics were investigated which use two types of dyes, such as C.I. Disperse orange and C.I. Disperse red 167. Dyeing temperature, pressure and leveling time were equally applied at 130 ℃, 250 bar, and 60 minutes with reference to the related literature, and experiments were performed at concentrations of 0.04, 0.1, 0.4 and 0.8 % o.w.f with different concentrations. Dyeability was confirmed through measurement of washing fastness and color coordinate, and a calibration curve of each dye was drawn up and the absorbance of the residual dye was measured to confirm the amount of residual dye and the dye exhaustion rate at the corresponding concentration. As a result of color difference measurement, as the concentration increased, the L<sup>*</sup> value decreased and the K/S value increased. However, as the concentration increased, the increase in K/S value decreased compared to the input amount, and this tendency was more obvious in C.I. Disperse red 167 than in C.I. Disperse orange 155. The dye exhaustion rate which was calculated by using the amount of residual dye in the pot was also C.I. Disperse orange 155 was 96.16 % and C.I. Disperse red 167 was 94.57 %. However, as the dyeing concentration increased, the dye exhaustion rate decreased, that C.I. Disperse orange was 95.33 % and C.I. Disperse red 167 was 90.63 %. As a result of the washing fastness test for both dyes, dyed samples of which concentrations were 0.4 and 0.8 % o.w.f decreased by 0.5 ~ 1.0 grade. This is predicted because the dye did not completely adhere to the amorphous region of the cotton fiber and the dye simply adsorbed. The fastness to rubbing also maintained at least grade 3-4 up to the 0.1 % o.w.f concentration, but at the concentration of 0.4 % o.w.f or higher, it fell to grade 1 or lower, showing a very poor friction fastness.
최훈석(HoonSeok Choi),김기홍(Ki-Hong Kim),전태영(TaeYoung Jeon) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
This paper presents a dynamic analysis of a high speed flight-vehicle as it is launched from rail guided structure. The important performance of the rail guided structure is that the flight-vehicle should be separated from the rail in a stable condition at the initial stage. Rail guided structure model studied in this paper is composed of rail structures, spring loaded detent and night-vehicle. The flight-vehicle has two hangers, one of which was constrained by detent mechanism prior to launch. As the vehicle moves, the forward hanger presses against the slope face of the detent level. In order for the vehicle to be moved, enough load must be applied to overcome the detent spring force. In this paper, launching mechanism and dynamic behavior of night-vehicle were studied. Analysis of the dynamics of the rail guided structure and flight-vehicle were simulated using MBD(multi body dynamic) simulation. AS a results of MBD simulation, detent force, contact force, roll/pitch/yaw motions of launched vehicle at the initial stage were plotted.