| Summary: | 碩士 === 國立臺灣科技大學 === 材料科學與工程系 === 102 === In recent years, the development of nanofibrous yarn has been focused with the increased technique of eletrospinning. The study use Taguchi method, analysis of variance (ANOVA), and principal component analysis (PCA) to design optimum parameters of different quality characteristics on continuous process of electrospun nanofibrous yarn. After above analysis, the physical properties of the yarn are discussed.
In the experimental procedure, trial-and-error experiments and one-factor-at-a-time (OFAT) experiments are used for affirming suitable choosing of levels before analyzed by Taguchi method. In the study, the discussed control factors are concentration of solution, nozzle size, flow rate, and take-up velocity. The experiment is designed by Taguchi L9(34) orthogonal array. The considered quality characteristics are fiber diameter, fiber uniformity, and fiber arrangement. The optimum parameters of different quality characteristics are obtained through the main effect plot of S/N ratio, then ANOVA and confidence intervals (CI) is applied to prove the results are reasonable. The multiple quality characteristics is analyzed by PCA through the normalized S/N ratio and principal component score. After the optimum parameter of multi-quality is obtained, the effects of twist level on yarn uniformity and tensile strength are discussed.
According to the experiments and analysis results, the optimum parameter of multiple quality characteristics occurs as concentration is 6wt.%, nozzle is 26G, flow rate is 3mL/hr, take-up velocity is 100cm/min, and twist level is 7.4TPC. In additioin, the tensile of nanofibrous yarn achieved to 3.10cN/tex.
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