Papers by Keyword: Elastic Recovery Rate

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Authors: Lei Xia, Ling Yin, Yan Fei Zhang
Abstract: The objective of this study was to investigate the relationship between fabric property and Clothing Pressure of knitted underwear, using objective pressure evaluates method. Eight kinds of fabric for knitted underwear were tested on the stretching property and elasticity property, and then eight same style of underwear which were made by Eight kinds of fabric were tried on by pressure dummy. Clothing pressure of seven different points was measured and recorded. The linear relationship between fabric property and Clothing Pressure of knitted underwear was obtained. Results showed that Clothing Pressure of knitted underwear was negative correlation with elastic recovery rate of knitted fabric, and was positive correlation with tensile stretch rate.
Authors: Si Die Wu, Jian Wu Lan, Shao Jian Lin, Si Chen
Abstract: To improve the elastic recovery of common poly(ester-ether) fibers, especially under lower temperatures, an imide dicarboxylic acid was prepared with trimellitic anhydride and aminobenzoic acid firstly, and then series of poly(ester-ether-imide) block copolymer(CPI) were prepared with this imide dicarboxylic acid, terephthalic acid, 1,4-butanediol and polytetrahydrofuran glycol .etc. The stuctures and properties were investigated by FT-IR spectra, differential scanning calorimetry(DSC) and capillary Ubbelohde. It was found that the Tm of the polymer was about 140°C and the intrinsic viscosity was 0.7~0.9dL/g. The CPI copolymers were melting spinning. The draw ratio and test temperature effects to the fibers' elastic recovery were studied. The results showed that stretching is beneficial to the improvement of the elastic recovery; the modified fibers' delayed elastic recovery was above 92% at 28°C and over 95% at lower temperatures of 5°C and -10°C, which is a great improvement to the common poly(ester-ether) fibers'.
Authors: Si Deng Zhang, Xu Zhen Zhang, Bin Sun, Long Chen, Zhi Yan Ma, Mei Fang Zhu
Abstract: Polypropylene pre-oriented multifilament were made by melt spinning with fast winding, and then hard elastic polypropylene fibers were made followed by annealing treatment under some conditions. The effects of the conditions of melt spinning and annealing process on the elasticity of polypropylene fibers were studied. The structure and property of hard elastic polypropylene fibers were analyzed by DSC,WAXD,SAXS and Sound velocity anisotropy. The results showed that the hard elasticity of annealed fibers increased with the improving of speed of winding, and the elasticity also increased with the improving of annealing temperature and extension of annealing time, and the elastic recovery rate of PP multifilament can be as high as 93.6%. The crystal phase of unannealed and annealed PP fibers did not change. Annealing leaded to form perfectly the characteristic crystalline structure of crystals of being perpendicular to fiber axis.
Authors: Hui Fang Ma, Jin Zhong Zhu, Hua Li Xin, Sen Lin Liu
Abstract: The strength and tensibility, elastic recovery ratio, evenness and hairiness of the pearl composite yarn were tested and compared with that of the same fineness pearl ring-spun yarn. It is concluded that the strength, elastic recovery and evenness of pearl composite yarn is superior to that of the ring- spun pearl yarn, thick spot or slub number per kilometer 1-8mm of hairiness index of pearl fiber composite yarn are lower than that of the pearl ring- spun yarn.
Authors: Xin Mei Fan, Hao Li Xia, Zhao Xiang Zheng, Yan Pei Li, Yuan Xue
Abstract: This paper studied the mechanical behavior of the filament/staple fiber composite yarn and the pure cotton yarn under the isostress and isostrain of cycling tensile strength with the conditions of small deformation. And it also analyzed the elastic recovery rate, creep rate and stress relaxation rate under the different deformation rate and load. The results show that the mechanical properties of elastic recovery rate, stress relaxation and creep all keep in good range in the experiment of cycling tensile strength with low certain elongation and constant load; as the increase of certain elongation and constant load, the mechanical properties of elastic recovery rate, stress relaxation and creep have much difference, just in terms of the conformality under the cyclic tensile strength, PET/PU/cotton composite yarn shows the best, next is the PU/cotton composite yarn, and then next is the PET /cotton composite yarn, and the pure cotton yarn shows the worst.
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