Comprehensive interpretation of the impact of spinning methods on yarn properties
Abstract: Physical properties of short fiber Different short fiber spinning technology has different effects on the physical properties and appearance of the yarn, and even affects the characteristics of the final product. (1) Different spinning methods have different yarn structures. The structure of short fiber yarn is different from that of filament yarn. The first is the arrangement of the external and internal fibers of the yarn. The external structure includes the appearance and surface structure of the yarn. Such as: the arrangement of fibers on the surface of the yarn; the hairiness of the yarn; the friction coefficient of the yarn; the characteristics of the yarn; the wear resistance and surface of the yarn
Physical properties of short fibers
Different short fiber spinning technologies have different effects on the physical properties and appearance of the yarn, and even the characteristics of the final product.
(1)Different spinning methods have different effects on yarn structure. The structure of short fiber yarn is different from that of filament yarn. The first is the arrangement of the outer and inner fibers of the yarn. , the external structure includes the appearance and surface structure of the yarn. Such as: the arrangement of fibers on the surface of the yarn; the hairiness of the yarn; the friction coefficient of the yarn; the characteristics of the yarn; the wear resistance of the yarn and other surface characteristics.
(2)The internal structure of the yarn is mainly the entire cross-section of the yarn body and the longitudinal arrangement of the yarn, fiber directionality, elongation, b>
The internal structure of displacement and twist includes: yarn strength; fiber mixing degree; bending strength; compressibility; resilience(Tendency to knot).
The above explanation of structural implications is not necessarily complete, but it provides a sense of the complexity of yarn properties.
Spinning Technology
In order to obtain the conceptual application of the influence of spinning process on yarn structure3dtex, 38
mmviscose staple fiber, trial spinning in5different spinning process systems.
(1)Traditional ring spinning process;(2)Compact spinning ring spinning Yarn technology;(3)Double nozzle(MTS)False wrapping spinning technology; b>(4)Vortex Spinning(MVS)Spinning; (5)Rotor spinning.
(1)The external structure of the yarn mentioned above can be seen on a scanning electron microscope. Applied microelectronic photography photos: including rotor spinning, air-jet spinning, vortex spinning, ordinary ring spinning and compact ring spinning. From the photos, you can see the external fiber orientation of the yarn produced by the five processes, among which the tight ring spinning More fibers form yarn in the outer structure of the spindle yarn, and almost all fibers are formed in the yarn body. The short fiber yarn is improved. The twist structure of the yarn is clearly visible, and one end of the fiber is twisted into the yarn body along the length of the yarn. , the tight ring-spun yarn has good orientation.
(2)Traditional ring spinning, under the same twist conditions, the surface of traditional ring spinning is disordered, and a large number of fiber tail ends are not twisted into the yarn body. A single fiber protruding outside the yarn may be caused by the steel ring/traveler or yarn guide.
(3)Vortex spinning is similar to ring spinning. The fibers are well arranged in the yarn body and the spinning speed is high350/Time sharing,
The wrapped fibers are in a thin spiral shape. The twist is basically the same as ring-spun yarn, and the actual twist of the yarn is basically the same as the calculated twist. The ratio of wrapped fibers to untwisted yarn core fibers is very high, almost completely covering the yarn core fibers. Therefore, the appearance of vortex yarn is basically similar to ring-spun yarn, and the outer wrapped fibers are together with the untwisted yarn core. Form true twist.
(4)Double-nozzle false-twisted yarn, double-nozzle false-twisted yarn, and vortex yarn are essentially different, double-nozzle air-jet yarn Wrapping fibers only account for 6%-8% of the total fibers. About 90% of the fibers are stretchable. Twisted, it can be clearly seen that the wrapping fiber wraps the yarn core more tightly than the vortex yarn.
(5)Rotor spinning, regardless of whether the rotor yarn belongs to the true twist category, the fiber arrangement on the rotor yarn is disordered, and the fibers in the middle of the yarn showZ andS directions, and the fibers are straight. It can be clearly seen that the wrapped yarn is not tangled, which is the advantage of rotor yarn and the basis of its characteristics.
Hairiness
Flying flowers and wool caused by spinningComparing fabrics with ring-spun yarns, non-traditional spinning fabrics feel thicker and harder than ordinary ring-spun yarn products, and there is also a small difference in bending strength between ordinary ring-spun yarns and compact yarns.
Another problem arises. When the yarn is deformed, the yarn becomes flat and deformed after being compressed on the warp and weft yarn cross-section. Detection of yarn thick places shows that when the yarn compression force increases, the thick places decrease.
The structure of the rotor yarn results in fiber distribution. At the fiber wrapped areas, the hand feels harder and the deformation force is smaller than the yarn without wrapping. Knitted fabrics and woven fabrics produced by rotor yarn often have an uneven, thicker and harder appearance than ring-spun yarn.
For comparison, the yarn slugs were tested under 1OOcN pressure conditions, which showed that the yarn has a good twist structure and is equivalent to Approximately95%of the deformed MTSdouble nozzle air-jet yarn are parallel untwisted fibers, which are more likely to produce Deformation, according to this test, the rotor yarn feels relatively hard. The yarn deformation can be detected by the tightness of the yarn on the appearance of the loom or knitted fabric.
Yarn resilience
The rebound of yarn is very important for textile processing, such as skew deformation of knitted fabrics. Resilience is measured by detecting the knotting force of the yarn. The resilience of truly twisted yarns such as compact ring-spun yarns and ordinary ring-spun yarns is different from that of non-traditional yarns. Rotor yarns with forward twist or reverse twist have even knots. lower.
The resilience of air-jet spinning is lower, mainly because of the higher proportion of parallel untwisted fibers. True-twisted yarns have greater resilience than non-traditional yarns, so when the fabric is further processed into knitted fabrics Less skew.
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Comprehensive interpretation of the impact of spinning methods on yarn properties
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