In the traditional ring spinning process, due to the limitation of the diameter of the steel ring, the volume of the yarn on the spinning bobbin is very limited and cannot be directly used for weaving; at the same time, impurities and yarn defects may occur in the raw material or spinning process. Must be removed effectively. The winding process was established for the above purpose. However, the traditional winding equipment has large manual joints, the quality is unstable, and the labor intensity and labor consumption are enormous. Therefore, the replacement of the traditional winder by the automatic winder is an inevitable trend of modern production. It is also a sign of effective quality control in production enterprises.  At present, the purpose of using automatic winder users in China is mostly to reduce labor. However, the development and requirements of the modernization process have actually put forward higher requirements for the automatic winder. These are mainly reflected in the following aspects.  1. The yarn tension is uniform, the density is uniform and controllable  Modern automatic winders have adopted various tension control systems, including balloon tracking, gap tension detection and continuous online tension detection. Example: The principle of the balloon tracking type is to detect the position of the yarn on the spinning tube to control the balloon, so that the tension does not rise when the yarn is small. The gap type tension detecting type adopts the unsteady mode to collect the tension, and the collected value is affected by other factors such as the yarn count, in addition to the tension itself, so the precision is not high. Continuous online tension detection is the most accurate control method. It is characterized by detection and adjustment to the same steady-state parameter, and the accuracy can reach 1CN, which can achieve “what you see is what you getâ€.  High-end applications use a direct continuous on-line monitoring of the yarn tension system to accurately detect all random yarn tension changes. These random tension changes are unpredictable. According to the real-time yarn tension value and calculated by computer, the tension of the yarn is adjusted by the electromagnetic tension disc, and the measurement and control precision of the yarn can reach <1cN, thus ensuring fast and accurate adjustment to a predetermined tension level. Process all bobbin models and compensate for any tension changes. In this way, for any yarn of different modulus characteristics, a high-precision constant tension is maintained throughout the high-speed winding process to ensure high-quality package forming. During the entire unwinding process of the cop It can be operated at the set speed from start to finish, so that the lower part of the winding is unwound without complicated loop tracking system, and the high speed can be maintained in the small yarn, so that the output is greatly improved.  It is also important that when the drum is started, the yarn will form under tension at this stage because the speed cannot be abruptly changed. With the direct continuous on-line monitoring of the yarn tension system, the yarn can also be reached at a high response rate in a timely and rapid manner before the drum reaches full speed.  This tension control system can achieve a large package of 320 mm or more under constant tension (1 cN), which can greatly reduce the yarn breakage rate in the next process. In this way, there is a wide range of applications for direct dyeing of the package, which enables very low density (<0.3 g/cm3) bobbin packages.  2, large package requirements for coils and other special packaging  One of the important factors affecting the size of the cartridge is the overlap of the overlap zone. When the rotational speed of the bobbin and the drum reaches a critical diameter of an integral ratio, an overlap region is formed. In the overlap zone, one of the yarns is arranged on or beside the other yarn to form a strip of parallel yarn. Overlapping strips create speed limits for unwinding, such as the use of the bobbin directly for dyeing, which in turn affects the uniformity of dyeing. This is especially the case when fine yarns are wound. The larger the package, the more severe the parallel strip at the critical diameter. At present, the mainstream anti-stacking system adopts electronic anti-stacking, adopts a slotted cylinder to drive alternating acceleration and deceleration, and artificially forms a slip between the grooved cylinder and the bobbin. However, since the pressure between the bobbin and the drum is fixed, the amount of slip is limited and cannot be effectively controlled.  The requirement for large packages without overlapping areas creates the basic principle of PROPACK. It uses a special set of automatic adjustment cradle pressure drive mechanism. The mechanism is automatically commanded to adjust the cradle pressure at the critical diameter of the bobbin by computer calculations, so that sufficient slip can be formed effectively to eliminate overlap and the winding diameter is no longer limited by overlap. .  In addition, in the case of the bobbin of the elastic yarn, in the case of the large-diameter high-elasticity, the outer layer of the yarn is pressed against the inner layer, and finally the convex end faces are formed on both end faces of the bobbin, causing forming defects. The larger the package diameter, the more severe the bulging condition. The modern advanced winder combines automatic tension control and automatic cradle pressure control organically through a computer. This is the basic principle of VARIOPACK. In this way, the elastic bobbin and the ordinary bobbin yarn can be formed in the same way.  3, the requirements of the length accuracy of the yarn  At present, automatic winders have automatic yarn length counting devices. The current common method is to record the number of revolutions of the drum into a circumference to complete the fixed length function. But the accuracy can only be around 2%. So the ideal way is to directly measure the distance the yarn runs in the yarn path. According to this requirement, there has been a method called ECOPACK, which uses an optical non-contact method to scan and record the moving yarn profile in the yarn path, analyze and compare the signals measured during operation, and convert the signal calculation into the current yarn. The length of the line is compared with the set value and the corresponding action is taken. With this high-precision length measurement method of ECOPACK, the yarn length error value of each package can be controlled within 0.5%. In the next process, such as warping, the same batch of yarn can be almost completely circumvented at the same time, effectively reducing the waste of the yarn that is not wound up and then need to be re-wound.  ECOPACK is particularly suitable for the production of high-quality high-grade yarns, such as fine combed cotton yarns, worsted yarns, compact spun yarns and subsequent processes requiring high-precision yarn lengths, such as warping, double-twisting, etc.  4, adapt to a variety of different yarn winding  With the development of new textile fiber materials and processes, a wide variety of yarn types are required for a wide variety of yarn types. Such as elastic silk core yarn, Linen Yarn , compact yarn, various animal protein fiber yarn.  At present, there are mainly mechanical knotters, mechanical boring tools and air splicers. Mechanical knotters are mainly used for filaments. Mechanical boring can produce a very good appearance of the knot, but due to the lack of single fiber entanglement in the knot, the stability of the knot and the resistance to alternating stress in the next process are not ideal, and at the same time due to equipment input cost and operation The cost is very high and its application is limited. The current mainstream connection method is the air connection method. At present, air splicers have developed to a very mature level, and the following types have been derived:  (1) The spray wet splicer adopts the atomizing water spray device to form a rich water mist in the compressed air during the splicing, which can increase the moment of inertia and the fiber holding force at the joint. The splicing of the coarse yarn or the strand can achieve very good results. At present, the most advanced electronic dose control method can quickly and effectively set and control the water mist content for different number of yarns.  (2) The elastic splicer is suitable for the splicing of the elastic core yarn. It is characterized in that the elastic silk core yarn is kept in the same manner as the ordinary yarn by the open manner. The use of special brake elements, improved yarn and cut yarn paths, and optimized control software ensure safe and smooth processing of the elastic core-spun yarn, maintaining the elastic yarn in the middle of the knot, with excellent strength and appearance. This splicing knot is more resistant to alternating stress during weaving without joint defects, and maintains a stretch style when knitting. The spring splicer can also be used in conjunction with a wet splicing device.  (3) Thermal splicers are mainly used for yarn splicing such as animal protein fibers, such as wool, enamel and blended yarns thereof. The air splicing process is optimized by adjusting the temperature of the splicing air to accommodate the properties of the spliced ​​yarn. The application of heated spliced ​​air takes full advantage of the thermoplasticity of the fibers. The yarn joint structure is stable in the splicing area, so the joint strength is increased and the appearance is improved.  5, winding process to achieve low energy consumption  The automatic winder is now fully integrated with single spindle control, and its energy consumption fluctuates greatly depending on the type and quality of the yarn being processed. The energy consumption of the automatic winding process has become an aspect that has to be considered in spinning. At this stage, the automatic winding equipment adopts variable frequency motor, and the central computer sets the control. In the actual process, in order to ensure that the minimum process requirement limit is not exceeded under the worst case conditions, the setting values ​​of various parameters on the winder are generally set to be high, such as generating a working negative pressure main suction motor, the power may account for Half of the power consumption of the whole machine. If no effective control is taken, the higher speed setting results in a very large consumption of the whole machine.  The most advanced modern winder is based on the use of variable frequency motor, and the automatic computer negative pressure monitoring device can automatically adjust the speed of the suction motor according to the amount of gas consumption. If there is no or only a few spindle movements, then suck The wind turbine runs at a low speed, which reduces the fan's power consumption by more than 50%. If there are many spindle positions in a short period of time, the negative pressure sensor will collect the negative pressure value at that time. Through computer control, the inverter motor speed will be increased rapidly to ensure that the negative pressure is accurately maintained at the set value. The head catches quickly. After this period of time, the system will automatically return to the low speed state. Due to the above principle, the advanced device can set the working negative pressure at a position closer to the limit process requirement, and the corresponding average motor speed can be effectively reduced to achieve energy saving purposes. According to the power consumption ratio of the negative pressure fan in the winder, this design can reduce the average power consumption of the whole machine by up to 20%.  6, winding process to achieve low return wire consumption  At present, most of the conventional self-winding machines do not have the yarn position control, and the time is set in the process of capturing the yarn end. After the yarn ends are caught, the extra set time will cause more lengths of yarn to continue to be inhaled. Conversely, if the set time is too short, the head success rate will decrease. In order to maximize the yarn splicing control and reduce the amount of yarn return, the yarn head sensor control technology is used in the most advanced modern self-winding machine.  This design is equipped with a yarn end sensing device in the winder's yarn catcher. When the yarn end is sucked into the suction arm and reaches the photoelectric sensing device, it will signal to continue the next action while closing the damper to save Energy consumption. Otherwise, the previous action will be maintained until the yarn end is reliably caught. When the yarn end is caught, the sensor can immediately signal the splicing action, and the yarn catching arm no longer has repeated movements to reduce the joint time and yarn waste. Generally, the length of the joint yarn can be controlled at 50. Cm~60 cm can greatly save the yarn. The same principle, such as after the yarn clearer is cut, after accurately determining the position of the yarn end, the length of the detected crepe can be completely sucked out to ensure that there is no crepe in the yarn.  7, the conclusion  The design and manufacturing precision and stability requirements of this kind of equipment are very high. It is one of the main textile equipments that have been researched and developed in recent years by various advanced countries. It is also the main technical reform content of many textile enterprises in China to improve product quality. Various new technology applications will be applied to the self-complexing machine. For the technical reform of many textile enterprises in China, the use of self-supporting equipment is not only to reduce the labor for the winding process, but should focus on the high-speed development of yarn as the starting point to improve the quality of the package and improve the efficiency of the next process. For the main goal. Source: Global Textile Machinery Our cashmere product including 2 series, Fall/Winter Cashmere Yarn and Spring/Summer cashmere yarn. We have color card and hold stock service for all these cashmere yarn. 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