Wool shape and the size effect

Wool fiber The edge height CST of the surface flakes of wool fiber is not only related to fiber length, but also related to fineness, both of which are positively correlated. A high CST value will significantly reduce H3 and increase pilling levels. The shrinkage rate and shrinkage recovery rate of thinner fibers are larger, and the shrinkage rate and shrinkage recovery rate decrease with the increase in fiber fineness.

Relatively speaking, the correlation between shrinkage elasticity and fiber fineness is low. The greater the curl speed, the poorer the resistance to pilling. Fabrics made of fibers with low bending stiffness are prone to pilling, and wool that is too fine (diameter: less than 8.5 μm) has low bending stiffness. No matter the static coefficient of friction or the dynamic coefficient of friction, all of them increase with the increase of fiber fineness, the height of wool fiber scales is related to DFE and DFE decreases with the increase in fiber length. The higher the DFEd, the less fluff and pilling will be visible because the fibers do not slip easily.

On the other hand, in the process of rubbing fabric, whether one end of the fiber construction is stuck or both ends at the same time When fixing some fibers will be stretched, and this part of the fibers will be entangled during the stretch release process due to the drawing effect, which will cause more curling. High curl frequency significantly reduces H3 tendency and pilling. The fibers in the sphere are difficult to slide due to the tight effect of the package, and there is no resistance to loosen and entangle when the external force disappears; the fibers in the yarn body are straightened and easy to pull out, and the fibers are curled and difficult to pull back when the external force disappears, that is, one-direction movementing. Therefore, it can also be considered whether the probability of pilling due to friction can be reduced by controlling the curl deformation of wool fibers.

Coarse fiber, the hair value is greatest when the grade is medium. The pilling experiment of wool knitted fabrics shows that coarse fiber fabrics do not pill easily. Under the condition of low grip, the coarse fiber fabric has less pilling and the pilling weight is lighter, the pilling number of the medium fiber fabric is more than that of the coarse fiber, and the pilling quality is heavy, and the change length has a great influence on the pilling number of the medium fine fiber and the quality of the individual hair follicles were not significant.

The number of globules formed by fine fiber materials is considerably higher than that of thick fiber and medium fiber materials. With the increase in density, the number of hairballs in fine fibers decreased to some extent, but ratherts of which increased the quality of a single hairball. Increased twist will reduce pilling to some extent, but there is critical pick-up and there is also critical twist for yarn hairiness. If the critical intake is exceeded, it will easily cause the short fiber to protrude from the surface of the yarn when the twist is high, which also shows that the short fiber should not be processed into single with high twist or high strength yarn. For fine fibers, the increase in twist is unfavorable for yarn dryness, coarse details and hair particles, causing the corresponding fabrics to pill easily.

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