Analysis of Segmental Yarn Spinning Technology Shi Jingjing Yang Enlong Chen Weixiong Xue Yuanyi Hong Lei (Zhejiang Jiaxing College) Law and other line density segment color yarn technology, and compared with the current several segment color yarn production methods. It is believed that the new technology adopts the three-axis four-roller section color spinning device to realize the same point control of the main yarn and the auxiliary yarn, which can be adapted to various lengths of fibers, improve the drying of the yarn and reduce the defects; The adjustment can meet various design requirements; the main and auxiliary yarn blending ratio can be changed at any ratio, and the control is quick and convenient, which can better improve the quality of the segment color yarn and enrich the color effect of the segment color yarn fabric.
Fancy yarns and their fabrics have become popular in recent years. The production of fancy yarns on cotton spinning equipment is a hot topic in the development of new textile products. Duan Cai yarn is a special spinning technology of colored fiber spinning. The yarn color is not only combined by a variety of colored fibers in the same cross section of the yarn, but also in the longitudinal length of the yarn, different combinations of colored fibers are not The distribution of the rules is intermittently changed, so the fabric made of the segmental color yarn has a soft and full color and a strong sense of layering, and has obvious novelty and uniqueness.
1 The status quo of color yarn technology at home and abroad From the perspective of domestic and foreign materials and equipment, the segmental yarn technology mainly uses the needle combing process to carry out color matching. In the multi-fund project: the key project of Zhejiang Key Technology Innovation Team (2012R10012-4), the color of the needle comb is fed with colored or colorless fiber strips, fed from the side of the fuselage to the four seats. The computer program controller controls the color-matching roller speed of the four stepping motor drives in stages to realize segmental color matching, and is made into segment color bars, and then spun into segment color yarns. The process can achieve multi-color matching in the same process. However, the process has certain requirements on the fiber length and fiber type, and is suitable for the needle comb drawing processing method. After the wool fiber strip is drawn by the subsequent process, the length of the color segment is long, and the product has a large limitation; the decorative yarn color strip is Feeding at four different points in the longitudinal direction of the base strip, it is difficult to make the head and tail of any color matching at each point, and the process is difficult to make and change; the equipment is expensive, and there are not many domestic manufacturers. At present, there are three main methods for producing segmental yarns in China.
1.1 Drawer section feeding method Draw frame section feeding method is mainly applied to wool spinning. In the process of copying foreign equipment, the computer program is used to control the frequency conversion or servo motor in the drawing process, and the multi-point position feeds the colored fiber strips in sections to form the segmented tops. This method is suitable for wool fibers with a long fiber length, and the draw frame is a needle combing machine. After the product is processed by the subsequent process, the length of the segment color is longer.
1.2 spinning machine three roller drawing method spinning machine three roller drawing method.
In the spinning process, the three-roller drafting mechanism of the spinning frame is simply modified, the main core yarn A is fed from the middle roller, the auxiliary yarn B is fed from the rear roller, and the auxiliary yarn is controlled by electric or mechanical means for intermittent feeding. The main core yarn A and the auxiliary yarn B are gathered at the middle roller jaws to achieve the segment color effect. This method is currently widely used in China, and its yarn-forming structure is: wrapping the auxiliary yarn on the main core yarn. This type of spinning mechanism is currently mostly used for the production of segmental bamboo yarn.
1.3 spinning machine four roller drawing method spinning machine four roller drawing method.
On the basis of the three rollers, a rubber roller is added to the rear roller, the three roller and the four roller. The rubber roller is used to hold the two rovings fed, the main core yarn is fed from the four rollers, and the auxiliary yarn is from three. The roller is fed, the roving bar A is controlled by the step rubber roller 5, passes over the smaller diameter end of the step rubber roller 5, and the roving whisker B passes over the smaller diameter end of the step rubber roller 5, and is subjected to the step rubber roller. 5 control, the program controller controls the servo motor, so that the three-roller and four-roller step-variable drive is assembled in the main draft formed by one roller and two rollers to realize the segment color yarn effect; the segment color control principle and the spinning The effect is similar to the three-roller drawing method. The difference is that the speeds of the three rollers and the four rollers are adjustable. The main yarn increases the draft control in the rear zone, and the yarn is more well-formed, but its three rollers and four The distance between the holding point of the roving and the two rollers is different, especially the spacing between the two rollers and the four rollers is not suitable for the drafting of the cotton fiber strip, and the roving of the three roller and the four roller. The grip point is not at the same point where the roving length is fed, not Step point control speed and the same site, affect yarn evenness, the adjustment process is complicated.
Although the four-roller method can spin the segmented yarn with relatively uniform dryness, the blending ratio of the main and auxiliary yarns is limited by the quantitative of the main and auxiliary rovings and the draw ratio of the rear zone. The adjustment and control are not convenient enough.
2 line density segment color yarn spinning technology and other line density segment color yarn spinning technology is a new type of segment color yarn spinning method developed for the current problems of the segment color yarn production technology. The spinning method is realized by a three-axis four-roller drawing method, which not only realizes different color combinations of the yarn cross-section and the length direction, but also maintains the yarn strand uniformity. See the specific structure, where A is roving and B is roving.
The mechanism was transformed on a conventional spinning frame drafting mechanism. Subsequently, the roller is designed as a coaxial double roller structure, that is, in the structural design of the rear roller, the fixed rear roller and the looper-mounted looper rear roller are fixedly mounted on the rear roller shaft, corresponding to each chain position, and the rear roller is fixed. Paired with the back cover of the looper, the effective width is one-half of the original width. The two rear rollers have the same outer diameter. The corresponding rear rubber roller is also designed to be mounted on the same rubber roller shaft. Roller. A looper roller drive shaft is added behind the rear roller shaft and a toothed belt pulley is provided to drive the looper rear roller through the toothed belt. The servo motor controlled by the program controller drives the rear double roller to rotate, and the rotation speed can be set in different time periods. The drafting mechanism is characterized in that the spacing between the main and auxiliary yarns is the same; the double rear rollers are mounted on the same shaft, and the jaws formed by the rubber rollers are on the same axis, and the roller can realize synchronous and co-speed control of the fiber strips.
When spinning, the linear density is T, A and B, respectively. The roving is fed to the rear roller through the yarn guide and the split grid, and is controlled by the fixed rear roller and the looper. The spacing of the rear drafting zones of the two roving strips is the same. After the double roller speed setting, the speed coupling equal-feed control method is adopted, so that the two sets of rovings of the A and B groups are kept at any time during the process of the feed speed segmentation, and the two sets of rovings are fed. The sum of the quantities is fed into the rear drafting zone unchanged, and after being bundled by the collector, the medium roller is fed at different drafting ratios, and merged in the front drafting zone of the spinning frame, and the drafting output of the front roller is performed. Coronation into colored yarn of equal density section.
In normal spinning, in the i-th process section, the feeding amount of the two sets of rovings of the A and B groups is controlled by the line speeds vSl and V of the fixed roller and the looper roller on the rear roller coaxial, respectively. The feeding amount of the inner and rear rollers is (T A Vs + T B xt, the fed roving strips enter the middle roller jaws through the collector, merge in the apron drafting zone, and are drawn through the front roller, roving The strip is twisted into a piece of colored yarn. In the transmission and control of the mechanism, the fixed roller and the looper roller are respectively driven by the rear roller shaft and the looper roller drive shaft, and the rotation speed is controlled by the computer program controller, which can be used for the rear pull The parameters of the extension zone are set in time segmentation, and the V-solid i and V-live speeds in each time zone are controlled. For the roving strips with the same number of special pairs of A and B, control V-solid i+V live i =V solid l+1+V live 1+1 is a constant, which can ensure that the feeding amount of the roving strip in the middle roller jaw is unchanged; for the roving strips with different special numbers of the two groups, the special number is T A and T B, the roving strip is fed from the fixed roller, and the roving strip is fed from the looper roller, as long as the V-speed is controlled by the V-line speed. The amount of T/T times, or the increment of V solid line speed is the T B/T times of the reduction of the V live i line speed, which ensures the feeding of the roving strips in the middle roller jaws. The amount is constant; the length of each segment can be controlled to control the length of the segment color; by setting various ratios of V solid/V live i, the combination of different fibers and colors can be achieved.
It can be seen from the above control principle that the method of color-spinning yarn of equal-line density segment has obvious technical advantages compared with the segment-spinning method adopted at home and abroad. Since the mechanism realizes the same point control of the main yarn and the auxiliary yarn, It is suitable for fibers of various lengths, and the yarn is improved by dryness and the defects are reduced. The length of the segment can be adjusted to meet various design requirements; the blending ratio of the main and auxiliary yarns can be changed at any ratio, and the control is quick and convenient. This spinning method better improves the quality of the segment yarn and enriches the color effect of the surface of the segmented yarn fabric.
3Conclusion The segmental yarns of the draw frame segmentation method are mainly used for the long length of woolen and segmental colors; the segmental yarns produced by the three-roller drawing method of the spinning frame are currently used more; the four-roller drawing method of the spinning frame is produced. The segmental yarns are relatively uniform, but the adjustment and control are inconvenient. The three-axis four-roller color spinning device with coaxial line speed coupling control can easily realize the constant feeding amount of the two kinds of fiber strips, thereby achieving equal-line density spinning. It is easy to achieve different color combinations in the cross section and length direction of the yarn, and better maintain the uniformity of the yarn strip. The spinning technology overcomes the defects of the existing color yarn spinning structure, realizes the same point control of the main yarn and the auxiliary yarn, is suitable for the spinning of various fibers, and can be used for spinning various types of roller drawing spinning mechanisms. Technical transformation of the section color yarn. The color yarn forming method is applied to the color spinning process, which can better meet the process design requirements of the segment color spinning yarn, and achieve the purpose of further improving the quality of the segment color yarn and enriching the color effect of the segment color yarn fabric.
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