Research on the application of multi-quality processing parameters optimization to the development of functional warm fabrics

Autor: Wei-Lun Lan, 藍偉倫
Rok vydání: 2019
Druh dokumentu: 學位論文 ; thesis
Popis: 107
This series study develops a multi-functional poly(ethylene terephthalate) (PET) fabric with far-infrared function and moisture absorption heating properties for warming clothing application. The study is divided into two parts: In Part I, polyethylene terephthalate (PET) is used as the polymer matrix, and nano germanium powder is uniformly mixed with PET by the melt blending process for modification, in order that the PET composite has far-infrared function. Afterwards, the modified PET is made into 75d/72f fully drawn yarn (FDY) by melt spinning and melt drafting. The properties of the yarn, including tensile strength, elongation at break, yarn count (in denier), far-infrared emissivity, and far-infrared heating are discussed. In order to optimize the quality of yarn in the melt spinning process, this study designs process parameters consisting of germanium powder addition, melt temperature, mold temperature, nozzle temperature, gear pump speed, and take-up speed using the Taguchi method. Then, the analytic hierarchy process (AHP) is applied to obtain the weights of each quality, which will be used in the technique for order preference by similarity to an ideal solution (TOPSIS) to obtain the optimal processing parameters for multi-quality yarn. The results show that the tensile strength of the optimized modification PET yarn is 4.84 g/d, the elongation at break is 41.26%, yarn count is 74.39d/ 72f, the far-infrared emissivity is 89% and the far-infrared heating is 6.3°C. The properties of the optimized modified yarn are obviously better than general PET yarn. In part II, the moisture absorption heating PET yarn is made by the hydrophilic PET, and the process parameters optimization for melt spinning is presented. First, in order to improve the hydrophilicity of PET, the modified PET is polymerized by terephthalic acid (TPA), ethylene glycol (EG), polyethylene glycol (PEG) oligomers, and sodium-5-s ulfobis(β-hydroxyethyl) isophthalate (SIPE). Then, the hydrophilic PET is made into a moisture absorption heating PET yarn, specified to a 75d/72f FDY by melt spinning. The properties of this yarn including hygroscopic heating, surface resistance, tensile strength, elongation at break, and yarn count are presented. In order to improve the properties of this yarn, the Taguchi method combined with grey relational analysis (GRA) is used to obtain the optimal multi-quality process parameters for melt spinning. From experiment results, this modified yarn has excellent hygroscopic heating, surface resistance and elongation. At the same time, it is shown that the warming fabric forms from part I and this modified yarn can get the properties as far-infrared radiation of 89%, textile heating of 8.1°C and surface resistance of 107Ω. Compared with the commercially available heating clothes, the warm fabric developed by this research institute has a high heat-increasing has multi-functionality, and can be applied to a cold latitude country at a high latitude.
Databáze: Networked Digital Library of Theses & Dissertations
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