Study On Axial Compression Bending Property Of Variable Cashmere Singe Fiber

Cashmere is precious and rare animal fiber in the world, but as a result of thechanges in the natural environment, breed improvement and the way of rearing,thecashmere fiber in bending properties has a certain degree of variability, which affectsthe spinning process and fabric wearability. So it is necessary to study variationcashmere fiber compression bending performance. This subject tested variationcashmere fiber compression bending performance of different ages, different breedsand different production areas; and pointed out that the relationship between thevariation cashmere compression bending performance and age, sheep species,origin;At the same time, the subject also studied the tensile property and crystallity offour fiber types of variation cashmere.The compression bending experiment was made on the cashmere which werefrom goats at different ages and gender, from which a large number of data wascollected, and the statistical of the peak value of force, the equivalent flexuralmodulus, the flexural rigidity and the compression bending curve of the cashmerefrom ewes in different ages were obtained. Study found that the peak value of force ofthe cashmere fiber form the three-year-old ewes were larger, and the second-fine fiberfrom the two-year-old ewes were smaller; the peak value of force of the twodimorphic fiber from the one-year-old ewe were smaller; the peak value of force andflexural rigidity of hair from Lamb were smaller; the scope of equivalent flexuralmodulus of single fiber compression bending form ewes in different ages were limited.For the compression bending curve of four fiber type, the compression bendingprocess of the second-fine fiber, two dimorphic fiber, hair are similar, but the flockingfiber’s is slightly different.About the compression bending properties of different sheep cashmere, mainlyfor lamb, ewe, wether, ram: the flexural rigidity and the peak value of force ofcashmere from ram were larger, which were respectively0.4745mN and7.2254×10-5cN·cm2; the flexural rigidity and the peak value of force of cashmerefrom ewe were smaller, which were respectively0.1493mN and2.8717×10-5cN·cm2;the flexural rigidity and the peak value of force of the second-fine fiber from ram were larger, which were respectively1.6888mN and24.9639×10-5cN·cm2; theflexural rigidity and the peak value of force of the two dimorphic fiber from ewe werelarger; the flexural rigidity and the peak value of force of the two dimorphic fiberfrom wether were smaller; the flexural rigidity and the peak value of force of the hairfrom ewe were larger; the flexural rigidity and the peak value of force of the two hairfrom lamb were smaller.About the compression bending performance of variable cashmere from differentareas, the cashmere fiber from different areas changed little; for the second-fine fiber,the first areas was larger than the others, the flexural rigidity and the peak value offorce of which were respectively1.8469mN and33.9328×10-5cN·cm2; the twodimorphic fiber and the hair from different areas changed greatly; among those aeras,the second areas were largest, which were respectively28.5057mN and539.7828×10-5cN·cm2; and the eighted areas were smallest, which were respectively7.5515mN and143.9823×10-5cN·cm2.The comparison between variable cashmere and normal cashmere showed that:the peak value of force and the flexural rigidity of the variable flocking fiber and thevariable second-fine fiber were larger than those of normal; the peak value of forceand the flexural rigidity of the variable two dimorphic fiber and the variable hair weresmaller than those of normal. The equivalent flexural modulus of cashmere changedlimited.Among those four types of cashmere fiber, the breaking strength of the flockingfiber and the second-fine fiber were similar, and the breaking strength of the twodimorphic fiber and the hair were similar, and the breaking strength of the twodimorphic fiber and the hair were larger than that of the flocking fiber and thesecond-fine fiber. The elongation of the flocking fiber and the two dimorphic fiberwere similar. The elongation of those four types of cashmere fiber was about30～40%. The initial modulus and intensity of the flocking fiber were larger than others.About the work of fracture, the hair was largest, then wasthe two dimorphic fiber, thesecond-fine fiber and the flocking fiber are smaller.Typical cashmere specimens were detected by X-ray diffraction test, and basedon the X-ray diffraction pattern, we analyzed crystallity of the sample. results showedthat: the crystallity of the hairwas largest,then was the flocking fiber, the twodimorphic fiber and the second-fine fiber, and the tensile property had a degree ofrelevance with crystallity. Compression Bending property of cashmere had loosely Relationship with crystallity.