How close is the pitch of the full poly-siro spinning trumpet?

In the full-sizing, the distance between two single-ply yarns has an important influence on the yarn quality. If the distance is too small, the effect of Siro spinning is not obvious, not only affecting the strength and hairiness of the yarn, but also deteriorating the yarn. If the distance is too large, the angle between the two single yarns is too large, so that the unbalanced spinning tension of the two single yarns increases, and the fibers in the two single yarns are unbalanced by the force, resulting in the fiber transfer failure. In balance, the fibers are not evenly stressed, and the fibers are easily broken or entangled with each other to affect the quality of the yarn. Therefore, in the actual spinning process, a suitable double-trumpet spacing should be selected.

Siro spinning machine was installed on the QFA1528 spinning frame transformed through the full-distribution spinning system and CJ23.8tex pure cotton siro-cluster collecting yarn was spun. The twist coefficient of the yarn was 320, the model of the wire ring was type 6903 4/0, the speed of the spindle 13,000 rev/min, spacer 2.75, negative pressure 2000 Pa, double horn pitch 2 mm, 6 mm, 10 mm, roving weight 4.0 g/10m, roving twist factor 103, among others When the spinning process parameters are the same, three different double-trum spacings are selected for spinning experiments.

YG172A type hairiness meter was used to test the harmful hairiness of yarns over 3mm; YGI35G type barometer was used to test the dry yarn CV value and kilometer details, kilometer thick section, and kilograms of neps; YG063 type single yarn strength was used. The instrument was tested for yarn breaking strength, breaking strength and elongation at break. Six cops were tested for each test and averaged. The test environment temperature is about 2°C and the relative humidity is about 65%.

About 6 mm spacing, the best

According to the test results, when the pitch of the bell mouth is 6 mm, the yarn is the best, the pitch is 10 mm, and the pitch of the yarn 2 mm is the worst. Among them, when the distance between the two bell mouths is 2 mm, the thickest section of the yarn is the most, and when the pitch is 10 mm, the yarn has the most neps. When the distance between the horns increases, the two fiber slivers are drafted at a certain distance and the yarns are combined with the twisted yarn. The coarse details between the two slivers compensate each other and help improve the yarns. Dry. However, if the distance between the two strands is too large, the angle between the two single yarns during the twist forming process will be too large and the convergence point is relatively high with respect to the yarn hook. In this case, the instability of the upward transfer of twist increases, the uneven distribution of twist on the two slivers, and the incompatibility of the two single yarns, not only results in fiber transfer and misalignment, but also affects the strands of single yarns. , And when the two single yarns are intertwined and combined, a nep or knot phenomenon occurs, which affects the yarn dryness. However, if the distance between the bell mouths is too small, the spinning characteristics of siro spinning cannot be reflected. In the gathering area, two strands of fiber slivers will be intertwined, increasing the negative pressure on the fibers in the slivers. The disadvantages are unfavorable, and there will be more coarse knots and neps in the yarn.

Increased spacing, strong growth trend

The experimental results show that with the increase of the flare, the strength of the yarn increases. When the distance between the flares increases to 10 mm, the breaking strength of the yarn decreases slightly, but the elongation at break of the yarn decreases. Still in an increased state. When the distance between the flares is 2mm, the effect of the yarn forming is not obvious, and the probability that the two yarns are put together is larger, the finishing concentration of the negative pressure on the fibers is reduced, and the fibers are held between the fibers. As the resultant force drops, the fibers easily slip off, which is detrimental to the fiber strength. At the same time, in the process of twisting into yarns, the fiber transfer is more confusing and the fiber alignment on the yarn surface is not high, which affects the yarn strength. When the distance between the bell mouths is 6 mm, there is a certain distance between the two strands. During the process of drafting, the two strands will not be intertwined with each other. In the agglomeration area, both strands will be well aggregated, the cohesion between the fibers in the strands is large, the fibers are not easy to slip off, and the fiber arrangement on the surface of the single strands of the two strands is twisted With a high degree of uniformity and a certain degree of strength, the two-strand single-heavy yarn has a more pronounced strand style. When the distance between the horns is 10 mm, although the two slivers can be fully gathered and twisted, the cohesion between the fibers increases, and the fibers are not easily slipped. When the yarn is subjected to an external force, the elongation at break increases. However, during the twisting process, the angle between two single yarns is relatively large, resulting in unstable and inconsistent tension on the two single yarns, which is not conducive to the strength of the yarns.

Spacing increases and hairiness decreases

The test results show that the hairiness of the yarn surface decreases with the increase of the distance between the hairpins. This is because as the distance between the horns increases, the distance between the two slivers increases, and both slivers can achieve a better agglomeration effect. The slivers can be more tightly gathered, accumulate more of the slivers on the edge of the sliver, and more short fibers are drawn into the single-ply body. The length of hair on the surface of the single yarn is less, and the two singles When the yarns are plied and twisted, the long hairs on the single yarn can be further wound into the yarn body, thereby further reducing the number of harmful hairs on the yarn surface.

The Siro spinning device was installed on the QFA1528 spinning frame after full-spinning and the full-spinning spinning yarn was combined with the advantages of full-spinning technology and Siro spinning technology. The analysis of the effect of the yarn on the performance of the Siro has led to the following conclusion: under certain conditions of concentrated negative pressure and other spinning processes, the number of harmful hair feathers on the surface of the yarn presents as the distance between the two flares increases Reduce the trend. In order to increase the strength of the yarn, the largest possible double-trumpet spacing is chosen when spinning the full-size yarn. In order to improve the dryness of the yarn, when the spun yarn is spun, a pitch of about 6mm is selected. Under the condition of certain other spinning conditions, the full performance of Zhongtex full-spinning spinning yarn made by selecting a double-trum mouth spacing of about 6 mm is the best.