How to reduce hairiness?

How to reduce hairiness?

How to effectively control hairiness is a commonplace topic and an important issue in the spinning process. Hairiness not only affects the appearance and feel of spinning yarns, but also easily causes adjacent spinning yarns to become entangled with each other during the weaving process. The resulting opening is not clear, and may even cause warp yarn breakage, reducing labor productivity. Method 1: Adopt collective spinning technology. When the yarn is twisted into yarn, a twisting triangle is formed. The internal and external transfer of fibers is violent, and the fiber head is easily squeezed out of the yarn body to form hairiness. The collective spinning technology can effectively reduce hairiness. The so-called collective spinning technology is to use the collector (trumpet) in the clustering area to cluster the yarn slivers that have completed the drafting effect. That is to say, the D-type drafting principle of the roving frame is applied to the spinning finishing process, that is, in the traditional three-dimensional spinning process. In front of the main drafting area of ​​the roller double short apron drafting device, a pair of rollers are installed to form a gathering area. A collector is used in the gathering area to realize the bundling of yarn slivers after drafting. Remove the collector in the original main drafting zone and optimize the friction boundary distribution in the main drafting zone to improve the evenness quality of the yarn. The twisting triangle area of ​​the yarn is reduced through the aggregation of the yarn sliver, thereby reducing the hairiness of the yarn sliver and reducing the loss of fibers. At the same time, because the fibers in the spinning yarn are more parallel and straight, the yarn strength and other indicators are improved. After the collector is installed, the hairiness amount of the yarn sliver can be controlled in both the main drafting area and the bundling area. After the collector is installed, the whiskers will have a certain convergence effect before entering the twisting triangle area. The width of the whiskers will become narrower from wide, the twisting triangle area will become smaller, and the generation of hairiness will be controlled to a certain extent, especially For the generation of long hairs above 3 mm, the manipulation effect is more significant. Since the bundler’s manipulation of yarn slivers is rigid and non-elastic, improper operation will seriously affect the evenness of the yarn slivers. Therefore, the outlet diameter of the bundler cannot be designed too small, and the bundling effect is therefore limited. The manipulation of hairiness of 1 to 2 mm in length will also have some impact. The finished tube yarn sliver is subject to a certain aggregation effect before twisting. When the yarn sliver is twisted, it is still in the shape of a flat ribbon, and the generation of hairiness is inevitable. However, due to the reduction of the twisted triangle area, the degree of internal and external transfer of fibers is controlled to a certain extent, and the number of long hairiness (mainly formed by the edge fibers of the twisted triangle area) is reduced. Method 2: Pay attention to the warping process. The hairiness on the surface of spinning yarn is mainly produced in the spinning process and increases in the winding process. The length and quantity of spinning yarn hairiness are directly related to the raw material performance, cotton blending plan, short staple rate, process parameters and the inherent quality of the semi-finished products fed in each process. It is also affected by the equipment status, workshop environment, operator level, workshop Governing water equity impacts. Most studies on the surface hairiness of spinning yarns start from the manipulation of the spinning process, but not enough attention is paid to reducing the surface hairiness of spinning yarns during the warping process. There are many warping factors that affect the hairiness of spinning yarns, and the warping machine model is one of them. The transmission method of the traditional 1452A warping machine is drum friction driving the warp beam. Due to the inertial rotation of the warp beam when it is stopped, the warp beam does not stop completely. The warp beam will slip on the drum, which will easily cause the surface of the spinning yarn to be frayed and hairy. Increase. For new warping machines such as Benninger warping machines, due to the use of AC motor driven hydraulic pressure regulating pump and variable speed motor stepless speed regulation to directly drive the warp beam, this transmission method will effectively reduce warp fuzzing caused by warp beam braking. situation occurs. The second is warping tension. Due to the consideration of uniform yarn tension during warping, the weight of the tension washers configured to lead out the spinning yarn at different positions on the creel is different, and the impact on the hairiness of the spinning yarn is also different. The warping tension increases as the weight of the tension washer increases, and the number of hairs also increases. The warping speed also affects the hairiness of spinning yarns. We took 14.5 Tex polyester-cotton blended chemical fiber fabric yarn as an example to conduct experiments. The results showed that as the warping speed increases, the number of hairy roots also continues to increase. This is because as the vehicle speed increases, the warping tension also increases, the friction between the spinning yarn and the yarn guide components on the warping machine intensifies, and the hairiness on the surface of the yarn body increases. The yarn guide distance during warping refers to the distance between the top of the bobbin and the yarn guide porcelain eye. When the warping speed is certain, there must be a certain yarn guide distance, and the tension is small at this time. After actual verification, this distance is usually 180 to 200 mm. Due to different yarn guide distances and different warp tensions, the amount of hairiness is also different. For a certain warping machine model, hairiness can be reduced from three aspects: first, the tension configuration is appropriate to ensure uniform tension, and the rotating member rotates sensitively; second, the surface of the yarn guide member is completely smooth, without cracks or damage, and has little friction on the spinning yarn ; Third, the vehicle speed and tension washer configuration must be adapted. Method Three: Optimizing Winding Components and Processes Winding is a process that increases the hairiness of spinning yarns. After the bobbin is wound, the hairiness increases by 35% to 45%. It is generally believed that winding speed, winding tension, groove drum condition and yarn clearing device are the main reasons for the increase in hairiness of spinning yarns. This is mainly because the spinning yarn is affected by the friction of various friction parts, causing the fibers that are not deeply embedded in the spinning yarn to be pulled out, forming regenerated hairiness. Under the same conditions, the higher the linear speed of the winding machine, the greater the increase in hairiness; the winding tension increases with the increase of the spinning yarn properties, and the winding yarn with the same properties will increase.��, the greater the winding tension, the more the hairiness of the yarn increases; the surface conditions of grooved drums with different materials and different finishing qualities are different, and the hairiness increases at different levels. Generally speaking, compared with bakelite troughs and metal troughs, the hairiness will increase by 15% to 20%; the mechanical clearing device obviously increases the hairiness of the spinning yarn, while the electronic clearing device hardly increases the hairiness. Hairiness. The linear speed of the winding machine should not be too high. The linear speed of the traditional winding machine is generally controlled at 500-600 meters/minute, and the linear speed of the automatic winding machine is generally controlled at 900-1100 meters/minute; in order to ensure good bobbin formation, When finishing without de-looping, the winding tension should be small. Keeping all parts of the winding machine in good condition is an important measure to reduce winding hairiness. Among the main components, electronic yarn clearers and metal troughs should be used in full, because these components have small friction on the spinning yarn, which can not only reduce the hairiness of the spinning yarn, but also improve the overall quality of the package yarn. Reasonable control of the temperature and humidity in the winding workshop will also help reduce the hairiness of spinning yarns. Generally, it is better to control the relative humidity at about 75% and the temperature within 30°C.
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