摘要
为探讨2次包缠的捻向和捻度配置对双包包覆纱结构与性能的影响,以3根异色111 dtex(48 f)无捻涤纶拉伸变形(DTY)长丝纱为原料,保持第1次包缠捻度不变,分别纺制了SZ交叉包缠和SS同向包缠各6种捻比配置的双包包覆纱,对成纱结构进行分析,并对拉伸断裂性能和捻度平衡性进行测试与比较。结果表明:同向包缠不能形成类似交叉包缠的分层包缠稳定结构;2类包覆纱的强力利用率均大于1,断裂伸长率相较原纱均提高25%以上;包覆纱的强力随捻比的增大,先增大后减小,但变化幅度很小;2次包缠的残余扭矩并非简单叠加关系,第2次包缠对第1次包缠的残余扭矩有固结作用;同向包缠包覆纱扭结指数远大于交叉包缠;合理配置2次包缠的捻比,可显著减小交叉包缠包覆纱的扭结指数。
Objective In order to explore the influence of the twist direction and twist configuration of the double wrapping on the structure and properties of the double covered yarns,the influences of twist and twist direction arrangement on the structure,tensile fracture performance and twist balance of covered yarns were experimentally investigated and analyzed,which were produced using the hollow spindle method with double wrapping.Method Three 111 dtex(48 f)untwisted polyester draw texturing yarn(DTY)filament yarns with different colors were employed as raw materials with unchanged wrapping twist,double covered yarns with SZ cross-wrapped and SS co-wrapped were spun separately each with 6 twist ratios,using hollow spindle covering machine.The covering structures of the covered yarns were analyzed by visual observation of the partial enlarged photographs of covered yarns,while the twist balance indexes were tested by open loop method and the tensile mechinical properties were tested by yarn tensile tester.Results The spinning principle of double covered yarns was explained,and the structural model of the two twist direction arrangement of the same direction wrapping and the reverse(cross)wrapping were established(Fig.1 and 2).Partial enlarged views of two types of double covered yarns showed that both types of covered yarns presented mixed color of core yarn and wrapped yarn,and it was found that with the increase of secondary wrapped twist,the finer the degree of color block segmentation mixed and the finer the texture of covered yarn.Meanwhile,the cross-wrapped was found to be able to form a clear layered wrapping structure.Double covered yarns and raw filament yarn showed similar force-extension curves,and the differences were only in the characteristic values like yield load and yield elongation,breaking strength and elongation at break,based on 50 core yarn tests.SZ cross-wrapped and SS co-wrapped covered yarns were produced with twist ratio of 0.9.The tensile test results of three types of raw yarn and two types of 12 covered yarns presented the changes of breaking strengths and their CV value,elongations at break and their CV value and strength efficiencies along with the changes of twist direction and twist ratio of twice wrapping(Tab.1).Different twist direction and twist ratio arrangement produced different twist balance in the double covered yarn,the snarl index test results of 12 composite yarns showed the self-twisting direction,mean values of snarl indexes and their CV value for 10 tests of the two types of double covered yarns with different twist directions and twist ratios(Tab.2).Conclusion It was discovered that co-wrapped can not form a layered wrapping structure similar to crosswrapped,and the strength efficiencies of the two types of covered yarns are greater than 1.The elongations at break are increased by more than 25%,and the strength of covered yarns increase first and then decrease with the increase of twist ratio,but the change range are small.The residual torques of the twice wrappings are not a simple superimposition.The second wrapping has a consolidation effect on the residual torque of the primary wrapping,and the snarl index of co-wrapped covered yarn is much larger than that of cross-wrapped.Reasonable configurating of the twist ratio of the twice wrapping can significantly reduce the snarl index of the cross-wrapped covered yarn.This paper would provide reference for the process design of double wrapped covered yarn.
作者
敖利民
唐雯
AO Limin;TANG Wen(College of Materials and Textile Engineering,Jiaxing University,Jiaxing,Zhejiang 314001,China;Key Laboratory of Yarn Material Forming and Composite Processing Technology of Zhejiang Province,Jiaxing,Zhejiang 314001,China;College of Business,Jiaxing University,Jiaxing,Zhejiang 314001,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2023年第7期50-56,共7页
Journal of Textile Research
基金
浙江省纱线材料成形与复合加工技术研究重点实验室开放基金项目(MTC-2022-01)。
关键词
捻度
捻向
双包包覆纱
拉伸断裂性能
捻度平衡性
残余扭矩
扭结指数
twist
twist direction
double covered yarn
tensile fracture property
twist balance
residual torque
snarl index
作者简介
第一作者:敖利民(1969-),男,教授,博士。主要研究方向为纺织新工艺、新技术与新产品。E-mail:aolimin@126.com。
