Shape characteristics of compact spinning

Other things being equal, the more yarn hair, the more severe the pilling of the fabric, and also the quality of the fabric will be affected. Therefore, based on ring spinning, there are several new spinning methods to reduce the hairiness of the yarn. Compared with the traditional ring spinning system, the compact spinning system greatly improves the yarn structure, yarn surface hairiness and yarn strength. Among them, the smoothness and strength of the yarn body surface are related to the hairiness of the yarn surface, and the pilling performance of the fabric is also affected by the hairiness of the yarn surface.

Currently, the wool worsted yarn spinning system adopts relatively mature compact spinning technology, such as Com4 Wood produced by Italian COGNETEX company, 800 Aircomtex produced by German ZINSER company and SUESEN company . The basicsof this equipment are about the same, that is, an accumulation zone has been added, which is located between the drawing zone and the spinning zone of the traditional ring key spinning machine. The problem of hairiness in the enhanced triangular region is fundamentally solved in the compact spin system. The main principle is to use the airflow to actively control the fibers to reduce hairiness. The compact spinning system uses the mechanism to actively control the fibers to make it the most adaptable. It can adapt to different raw materials such as cotton, wool and hemp, and can also adapt to different yarn tensions. It is very applicable.

The essential difference between compact spinning and ring polyester spinning is changing the static and passive method of traditional ring spinning. The mechanical bundling is the active bundling of airflow force. The advantage of this is that it not only hIt can effectively improve the control ability of the main drawing zone for the movement of the floating fibers, but also actively reduce the bundled fibers and the hook phenomenon caused by the bundled fibers, that is, Air-flow slot type compact spinning technology, which can improve the height of triangular area decreases or eliminates, hairiness and flying flowers decreases, spin tension decreases, and production improves speed and yield.

However, according to Mourad Krifa\'s application of compact spinning technology to short and medium cotton fibers, the research results show that yarn hair and tensile properties are not significant lower. In the ring binding spinning technology, the outer fiber of the yarn is subject to greater tension due to the large twisting triangle area. As soon as a large external force is applied to the yarn, the outer fiber will break first, causingthe yarn\'s strength utilization rate is only 60% of the sum of the strength of a single fiber. However, in the compact spinning technology, the added triangular area is smaller and the peripheral fibers are better controlled, so the yarn strength, hairiness and other indicators are better than that of the traditional ring.Dye spun yarn.

The fiber transfer rate in the compact spinning system is high, which is beneficial for increasing yarn strength. The generated negative pressure accumulates and the spinning triangle becomes extremely small or even disappears. The above analysis shows that compact spinningThe transfer speed of yarn fibers in the radial position is higher, and the transfer speed of R fibers is also higher.The former is beneficial to reduce the spinning twist triangle area, and the latter can reduce the effect of yarn density reaches. time, compared to traditional cyclodyne yarn, the diameter ofthe compact spun yarn decreases, that is, the density of the compact spun yarn increases, and the interaction between the fiber and the fiber increases, which improves the characteristics of the yarn\'s strong and compact spun yarn.

(1) Yarn structure and performance analysis of compact spun yarn

The physical properties and performance of yarn are closely related to its structure. The necessary condition to predict the performance of yarn, and the internal structure of yarn mainly refers to the geometric structure of yarn fiber, that is, the spatial shape of fibers, especially including the distribution of twist in three-dimensional space of fibers in the cross section of yarn, the shape of fibers It is relatively scientific and practical to use the tracer fiber method to study the fiber arrangement in the yarn, such as the transfer coefficient and the orientation degree of the fiber in the yarn. Track, the modern testing softwarere can also be used to directly measure the distribution position of the tracer fiber in the radial direction of the yarn.

(2) Fiber transfer in compact spun yarn

Similar to the internal and external transfer of fibers in traditional ring starch spun yarn, there is also fiber transfer in compact spun yarn, and the spiral history of the fiber is regular and the spiral history is close to the ideal spiral fiber curve: in addition, the tracer fiber in the compact spinning yarn will stop for a certain time at the axis of the yarn or the outer farm distance, while at the ring The fibers of the silver poly-spun yarn are thinner, and the fibers hardly stick. If you compare the diameters of the two yarns, the compact spun yarn is about 10% smaller than the traditional ring-spun yarn. The linear density of the yarn is high

(3) The hairiness of the compact spinning yarn

The evennessThe softness of the poly-spun yarn is better than that of the traditional ring-dyed yarn. The edges are also neater; while the traditional ring spinning yarn has more hair and the number of long hair is significantly higher than that of the compact spinning yarn.

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