The Spinning Theory And Process Of Core-Sheath Composite Yarn And The Research On Its Product

A new method of composite yarns which consist of natural staple fibers and filament was put forward, broke through the conventional method of blend spinning, compound spinning and core spinning in yarn ' s structure and property. The core-sheath composite yarn was spinned on the ring frame by the staple sliver and filaments, which is one of excellent ways for natural fabrics to solve the problems caused by raw materials, downstream processing, and finishing, especially for the light worsted fabrics. The difference between components and the peculiarity in structure have much influence on property of the composite yam and the fabric woven by it. It is useful to know of the structure and property of the fabric woven of core-sheath composite yarns for providing scientific evidence to develop functional fabrics for different purposes. In this paper the process and principle of spinning core-sheath composite yarn were introduced, the structure and property of the yarn and its fabric were tested and evaluated.The yarn properties not only depend on the their fiber properties but on the yarn structures. The yarn structure can be described by the fiber geometric arrangement. On the extant theoretical basis, the fibers arrangement and orientation were analyzed in detail by put forward a three-dimensional model. To control the fiber migration is the key to produce high quality yarns.The spinning method determine the yarn structure while the structure and the component affect the yarn ' s property. While spinning the core-sheath composite yarn with staple fibers and filaments on the ring frame, the pre-tension, proportion and the position when the filaments entering the staple sliver have important influence on the yarn' s property. The cross-section of the yarn is ring-shaped; the filament is in its center with the staple fibers covering. The appearance of the yarn is the same like the traditional ring yarn in longitudinal direction. At the same time some methods to evaluate the proportion and the covering rate were introduced in this paper. For the mechanical property, the strength and elongation was studied. The strength-and elongation change with the proportion of components and the pre-tension of filament. Yarns with different counts were tested and compared. And the trend how the pre-tension and proportion affect the strength and elongation was studied. The two factors affect the strength and elongation at the same time. The pre-tension determines if the filament is straight in the yarn, the proportion of the filaments determine the extent on which thefilaments to endure the burden.Because the structure of the yarn is steady, the modification of weave process is little and the phase of finishing is short. In the mechanical property, the composite fabric ' s strength of tensile strength , tearing strength and bursting strength are all much larger than that of staple fabric. In the style, the bending resistance was decreased compared that of staple fabric, which can be seen through the fabric's Aesthetic coefficient and Liveliness percentage was increased in the draping property. With the filament being as the tightness, the anti-crease property was much improved .And the composite fabric was non-iron with super shape-retentive property. Additionally, because of the high covering rate of the staple fibers to the filaments, the yarn is even and the hair is little. The fabric has flat surface with the same appearance and felling as that of staple fabric. And the anti-static is obvious.