In addition to some of the characteristics of traditional fancy yarns, crocheted fancy yarns have the advantages of novel appearance, no hair removal and no detachment. Since the 1980s, crocheted fancy yarns have become the new darling of fabrics and fashion designers, and have gradually become the new fashionable elements in the domestic and international textile market. 1. Crocheted feather yarns in fancy yarns. As the feather has a fund items: 2010 Shaoxing text of Science level college students research projects (project preparation News of: Tang Limin, E-nail:. tlmusx.edu.cn given directional distribution, highly decorative effect, made of fabric Soft gloss, full cloth, warmth, and easy to lose hair, taking good performance, has a good market prospects. 1 crocheted yarn yarn spinning process principle Production process: With 2 warp needles as a group, there are several warp yarn needle positions between 2 needles. The number of empty needles determines the length of the feather. The warp determines the strength of the feather yarn. Generally, the stronger nylon filament is selected. The feather is formed by the weft yarn. Just like the decorative yarn in the fancy yarn, it mainly plays a decorative role. Therefore, the weft yarn is selected according to the characteristics of the desired feather. Raw materials, such as shiny, colorful, soft or hard feathers. The weft yarn firstly fills the weft yarn on the needle bar of the warp needle on the left side of the warp yarn needle to complete the weft insertion, then rises transversely across several warp yarn empty gauges, and then lowers the weft yarn from the right to the needle bar of the warp needle to complete the weft insertion. In this way, when the warp yarns are moved back and forth two times, the weft yarn needles are finished with weft insertion from left to right. In this way, the weft yarns are continuously connected to each other between two warp yarns to form a yarn path like a sleeper on a railway. Finally, a weaver blade is used to cut the middle of the weft yarns. The weft yarn originally connected between the two warp yarns becomes a feather and is connected to each other. The root warp yarn becomes two feather yarns. 2 Process parameters of crocheted feather yarns The crocheted fancy yarns are produced on the crochet machine using the principle of warp and weft insertion. The main technical parameters of feather fancy yarns include the material specifications of the warp and weft yarns, feather length, density and feathers continuous or interval. Wait. 2.1 Yarn raw material According to the needle number of the warp needle, the number of warp yarns should not be too thick. If the yarn is too thick, the yarn cannot enter the needle hook completely and it is not easy to make a circle or to make a circle. Therefore, there are certain requirements for the fineness of the original yarn, and the strength is also required to be relatively better. The weft yarns mainly play a role in feathers, and need to be selected according to the requirements of the feather design. The available range is relatively large. 2.2 Length of Feather The feather length of the feather yarn is mainly determined by the number of spacers of the two warp needles and the position of the knife, as shown. 2.3 Feather density Feather density is related to the warp input roller speed and the yarn output roller speed of the crochet machine. As the yarn output roller speed decreases, the feather density gradually increases, but the speed reduction is limited because the speed is too high. When it is slow, the warp tension is too small and the old coil cannot unwind and cannot be spun. The density of feathers is also related to the raw material of the weft, and the other parameters remain unchanged. The thicker the yarn, the denser and fuller the feathers. However, due to the influence of the needle number of the weft and weft yarns, the thickness of the selected weft yarn must also be consistent with the needle number, and it is not as thick as possible. Feather continuous flower chain arrangement 2.4 Feather Continuity Spun feather Feather yarn is continuous or the spacing is mainly determined by the flower plate arrangement on the flower plate chain. For a feather length yarn process, if the feathers are to be continuous, their panel arrangement is as shown, if they are spaced, as shown (adjustable depending on the size of the gap). Arrangement of feather chain spacing 3 Conclusion Feather characteristics are mainly determined by the variety, specification and characteristics of the raw material of the weft, especially the gloss and color, which have a particularly obvious effect on the appearance of the feather yarn. The length of the feather is related to the interval of the warp yarn groove and the position of the cutting knife. It is also related to the elasticity of the weft yarn and the tension of the upper machine. Generally, the greater the elasticity and the tension, the greater the recovery after being cut, and the feather is relatively short. Feather density is related to weft raw material, output roller speed, knitting needles and so on. The speed of the output roller is related to the yarn tension, and the speed of the output roller is large, causing the yarn to break more. The continuity of feathers is related to the arrangement of the flower board arrangement. The pre-tensioning control of the warp yarn is very important, the tension is too large, and it is difficult and easy to break in the loop during the spinning process. The tension is too small, the warp yarns are easily cut by the knife or the weft feathers cut continuously. 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