Abstract: The widespread popularity of yarn-dyed products provides a broad space for the production technology of precision winding. The article introduces the technical characteristics of sGD0101 and sHGD0102 precision winder, and carries out the technical problems of winding form, wire tension and overfeeding. Key words: yarn dyeing; precision winding; process technology With the improvement of living standards and the enhancement of market awareness, yarn-dyed products are increasingly favored by people. Not only the yarn-dyed silk is popular in domestic and foreign markets, but also the silk and synthetic silk are also widely used in silk weaving, which promotes the dyeing of the cheese. In the production of yarn-dyed industry, it is becoming more and more prosperous; coupled with the extensive use of shuttleless looms, the loose-type precision winder has been widely promoted in the silk industry. In 1986, the sGD0101 precision winder successfully developed by Shanghai Second Silk Machinery Factory was used as the preferred model by the yarn-dyed, cotton-weaving and knitting industries. It has produced and sold nearly 3,000 units. In summing up the experience of internal and external advanced winding technology, in 1999 the factory successfully developed the electromechanical integration SHGD0102 high-speed precision winder. This model was listed as a national key new product in 2000 and has been put into mass production. The mulberry silk and the high count yarn are relatively small in diameter, so the package needs to adopt the precision winding technology, that is, the winding form with uniform winding density and no overlap, to ensure that the dyeing liquid and the hot air penetration resistance are small when the package is dyed. Convenient leveling and silk drying, keeping the wire retreating smoothly and evenly. The sGD0l0l type sHGD0102 precision winder has a large capacity and achieves the requirements of “precision†and “looseâ€. It is not only suitable for silk, but also widely used. Cotton yarn, polyester filament, low elastic stretch, blended fiber. The formed tube is adapted to the leveling dyeing, and can be smoothly and quickly decomposed during the weaving of the shuttleless loom. The sGD0101 and sHGD02 precision winders are composed of frame, winding forming system, tension control system, overfeeding system, oiling system and electronic roughening. The winding forming mechanism of the sGD010l type is a traditional mechanical collective control. That is, each 24 spindles is controlled by a set of forming mechanisms, so the winding shape of each spindle is the same: sHGDol02 is a new mechanical and electrical integration model, which not only improves the former's wearing parts, but also abandons the traditional The whole mechanical transmission of the ingot box and the guide wire is wound, and the independent servo motor controls the winding and forming of each wire, and the structure is simple, the line speed of the winding forming, the winding ratio, the reciprocating stroke, the edge width, The parameters such as differential amplitude and differential time are completely independent and controlled by the single-spindle in the form of man-machine dialogue. The winding process is designed according to the characteristics of various textile fibers. It can be controlled by the whole machine and can be controlled independently by single spindle. The mixed production of silk, cotton, wool, hemp and chemical fiber materials is multi-purpose; the liquid crystal display and touch screen reduce the volume of the control system, and it is convenient and intuitive. Thanks to the computer control, the optimized process technology data is input on the computer, and the cow production is automatically controlled according to the optimized state, which lays a foundation for the office control operation. 2. About process technology issues The two types of precision winders have already achieved good results in various production plants. Based on the actual production conditions of the factory, these plants have explored reasonable process parameters and solved many technical problems in production, thus ensuring the protection. Production went smoothly. According to the exploration of the factory and the experience of the relevant factory, the technical problems of Dingyi that should be mastered are as follows. 2.1 Winding form The winding form of the thread on the bobbin directly affects the winding amount of the loop and the quality of the package forming, especially in relation to the quality of the dyeing of the bobbin. The general principle of mastery is that the filaments dyed by the cheese are looser than the yarns directly used for weaving to obtain satisfactory dyeing uniformity and dyeing effect; the winding density of the filaments is looser than that of the silk, because When the filament is subjected to a force of 1 force, the filament is easily elongated due to the rheological property, and the elongation is easily restored when the processing is completed, so that the excessively tight winding density is disadvantageous for the dyeing of the distillate. In daily production, we mainly control the winding angle of the wire, and it is feasible and simple to control the winding ratio. The winding ratio of the commonly used silk thread in production is: high-elastic yarn for knitting: 1:1: low-elastic polyester 2:2 for weaving, 3:2 for silk. The winding values ​​commonly used in production are shown in Table 1. When the winding angle a ≥ 10°, that is, cross-wound, in the table, the windings of the three raw material threads listed are basically cross-wound, and the winding angle of the bottom layer of the bobbin is large to ensure the winding of the yarn. The forming is good, and the winding angle of the low-elastic polyester and the outer silk of the mulberry silk which are favorable for the dyeing liquid in the inner layer of the cheese is 8, 5 respectively. And 9. It is a range of parallel winding, and due to the other solid inner layer winding, the parallel winding of the outer layer can increase the winding container of the wire without damaging good forming. The winding ratio -J of sGD010l type and sHGD0102 type two kinds of precision winder is arbitrarily adjusted according to the raw material process. In daily production, there are several issues worth noting. (1) Resolving the retraction of high-elastic nylon yarn for knitting. The high-elastic yarn for knitting is easy to elongate during processing, and when the external force is removed, the thread is quickly retracted, so that the winding of the thread on the bobbin is very urgent, and the winding is more urgent due to the heat shrinkage of the synthetic fiber. To this end, the following method can be used to solve the problem that after winding the wire into a full cylinder with an empty tube of 110 mm diameter, the wire is slowly slipped out of the smooth bobbin and then placed on an empty bobbin having a diameter of 65 mm. In order to meet the natural retraction of the thread and the retraction of the stored boiling water, the dyed package is not only well formed, but also has a good dyeing effect. (2) The wire is reciprocally wound around the bobbin. The silk threads on both sides are relatively tightly packed, and the varieties with thicker diameters such as viscose filaments tend to produce dyeing on both sides, and the color of the silk thread is obviously lighter than the middle. To this end, a two-step rewinding can be used: firstly wind the wire from the empty cylinder to: 30mm, the squid is first immersed in hot water for more than 15min, so that it is fully contracted by heat, and the drum is dried and then poured into Large tube, and then dyed in the tube, can get better dyeing effect and uniformity. (3) When the silkworm bobbin is dyed, the diameter of the silk thread becomes fine due to the falling off of the silk thread, the winding is very soft, and the forming is deteriorated, which affects the unwinding. To this end, the bobbin should be wrapped with an elastic woven yarn sleeve before dyeing to ensure that the bobbin has a good shape and does not disturb the thread. 2.2 The tension of the thread tension wire directly affects the tightness of the bobbin winding, thus affecting the dyeing; the tension of the thread affects the breakage rate and the shape of the bobbin. If the tension is too large, the package is too tightly wound, and the dyeing is difficult. The yarn breakage increases during production: but the tension is too small, so that the package is too loose, which is easy to cause collapse, etc., and the coin is good for dyeing. Therefore, the tension of the wire can be appropriately adjusted and selected according to the condition of the production workshop of each factory (relative humidity, temperature, line speed at the time of thread production, etc.) and the raw materials, generally based on the softness of the package winding. Table 2 shows the wire tension parameter values ​​of several precision winders in production, and the wire tension of the sHGD01 02 precision winder is measured under the test condition of the line speed of 400~4jom/min. The line speed has reached 700m/min and the tension value can be increased appropriately. Note; the package hardness tester is HP5 type made in Germany. The degree of softness and tightness of the cheese. It can also be expressed by the density of the yarn, and is often controlled at 0.2 to 0.49/m in actual production. Within the range, mulberry silk is generally used at 0.289/m 2.3 Super feed In the production of precision winder, if the wire speed increases, the tension value will also increase, and the excessive tension will form the broken wire of the wire, which limits the wire speed of the annual production and reduces the production efficiency. For this reason, the method of super-feeding of the thread is often adopted, that is, the length of the fed wire is longer than the length of the wound wire, and the condition of the "hard-drawing" of the cheese when the wire is wound is improved to gently wind the wire, and the break can be reduced. . One overfeed is controlled between 102% and 106%. 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