A comparative study on performance characteristics of multicomponent core-spun yarns containing cotton/PET/elastane

Abstract

This paper experimentally investigated the characteristics of different (filament and multicomponent) core-spun yarn type. Filament core-spun yarns comprised cotton covered drawn textured (DTY) polyester (PET) filaments with four different filament finenesses. Regarding the production of multicomponent (dual) core-spun yarns, both PET with four different filament finenesses and elastane with four levels of draft variable were fed simultaneously. Yarn samples were produced with modified ring spinning system at the same spinning conditions. As a control group, 100% cotton ring-spun yarn was also manufactured. Tensile properties, unevenness, imperfections and hairiness of yarn samples were determined. Also, fatigue characteristics of yarn samples were examined at two different loading of cycles. The results showed that filament fineness had a significant effect on all yarn properties being determined. Dynamic modulus and dynamic strain properties of yarns, filament fineness, elastane draft and number of cycle were found to be statistically significant at 0.05 level.     

不同品种百合内外鳞片游离氨基酸组成的主成分分析及聚类分析

为研究不同品种百合鳞茎中游离氨基酸(free amino acids,FAAs)综合品质的差异,以7种百合内外鳞片为研究对象,采用液相色谱-串联质谱法测定游离氨基酸种类和含量,采用味道强度值、主成分分析法及聚类分析法综合评价。结果表明:百合中氨基酸含量丰富,均含有21种FAAs,总量在4.10～10.10 mg/g之间。不同品种之间总游离氨基酸(total free amino acids,TFAAs)、必需氨基酸(essential amino acids,EAAs)、呈味氨基酸、药用氨基酸含量均存在差异。整体上,内片TFAAs含量高于外片,平均值分别为7.00 mg/g和6.18 mg/g;所有品种中,兰州(平陆)、兰州(兰州)、川百合中TFAAs含量较高,岷江百合最低;卷丹、川百合中EAAs含量高,内外片含量均占TFAAs的10%以上;呈味氨基酸中,以苦味和鲜味氨基酸占优势,谷氨酸和精氨酸为主要贡献者;药用氨基酸含量丰富,所有品种占TFAAs的49.18%～70.15%。通过主成分分析提取5个主成分,累计方差贡献率为88.803%,能较好体现FAAs综合信息。根据综合排名得出前3...