纤维力学性能对自捻纱线自捻程度的影响

Effect of fiber mechanical properties on twisting degree of self-twist yarn

为研究纤维力学性能对自捻纱线自捻程度的影响,根据自捻形成过程的总应变能守恒推导出自捻捻回角和纤维抗弯刚度、扭转刚度的关系。结果分析表明:纤维抗弯刚度越大,自捻纱线的自捻捻回角越小;纤维扭转刚度越大,则自捻纱线的自捻捻回角越大;自捻捻回角的大小和纤维的扭转刚度和抗弯刚度之比成正比,即随着纤维扭转刚度和抗弯刚度之比的增大,自捻捻回角增大,所加自捻捻回数增多。通过对苎麻、涤纶、腈纶、羊毛4种纤维所纺的自捻纱线的半周期捻回数进行测试,验证了上述关系并得出结论:羊毛和腈纶纺纱时所得自捻捻回数较多,较适合采用自捻纺纱方式进行纺纱;而涤纶和苎麻所加自捻捻回数较少,不太适合采用自捻纺纱方式开发纺织品。

In order to study the effect of fiber mechanical properties on twisting degree of self twist yarn,and the relationship formula between the twist angle and fiber bending stiffness,torsional stiffness is derived from the conservation of total strain energy during the process of self-twist spinning. The formula shows that the larger bending stiffness has the smaller twist angle and the bigger torsional stiffness has the larger twist angle. So the size of the twist angle is proportional to the radio of fiber torsional stiffness and bending stiffness,namely with the ratio of fiber torsional stiffness and bending stiffness raises,twist angle increases,and the number of the self-twist twists is greater. By testing the number of the self-twist yarn twists respectively spun from ramie,polyester,acrylic and wool,the above relationship is verified and the conclusion can be drawn as： wool and acrylic are more suitable for self-twist yarn by self-twist spinning with greater self-twists number,but polyester and ramie are not suitable for textile development by selftwist spinning with smaller self-twists number.