毛条成形中长度损伤的演变与表征:(2)纤维的折钩——隐性损伤

纤维长度在成条加工过程中会损伤变短,除纤维断裂(显性损伤)外,纤维的折钩(隐性损伤)是最主要的损伤。采用从纤维条两端分别抽取纤维制备一端整齐纤维束(称为A试样和B试样)的测试方法,可获得分析纤维隐性损伤的长度特征值。基于长度特征值建立的各差异率和损伤率指标,可有效地表征纤维的隐性损伤。实测证明毛条加工过程中纤维的折钩只能部分消除,剩余约40%,即始终有3%~7%的折钩纤维存在。经对比分析得到较敏感和稳定的指标是短纤维率和加权平均长度。

Characterization and evolvement of fiber-length damage in wool top making: part (2) fiber hooking and bending- implicit damage

Apart from the explicit damage(fiber breaking),fiber-length will be damaged and shortened in top-making by the implicit damage,i.e.fiber hooking and bending.Using a two-end sampling fiber method from a top,two fiber bundle samples,each with one end flush and uniform,are obtained and called sample A &;amp; sample B respectively,and from them the length characteristics for analysis of implicit damage of fiber can be got.Implicit damage of fiber can be effectively characterized by the difference rate and the damage percentage determined by the length characteristics.The test results indicate that the fiber hooking rate can be reduced,but there still exist 40% remnants of the hooking fibers,i.e.3%～7% hooking fibers left in tops,and the more sensitive and stable parameters to evaluate the implicit damage are the difference rates calculated from short fiber content(SFC),Hauteur length and Barbe length.