Effect of cross-sectional shape of yarn duct of interlacer on yarn motion

In order to make clear the effect of cross-sectional shape of yarn duct on yarn motion,this paper used optical fiber sensors to measure the motions of filaments in various cross-sectional shapes of yarn duct of interlacer.Several pairs of optical fiber sensors distributed in vertical and horizontal directions and the positions of the yarn were decided by whether it can shield the lights emitted from the light-serving optical fiber.It was found that filaments staying in certain position in yarn duct for a long time was good for improving the strength of an interlaced yarn,but not good for the number of tangling parts.The cross-sectional shapes of yarn ducts which can make yarn revolve like a modified form of figure 8 could provide better opening and revolving for filaments and the tangling parts could be formed easily.A kind of elliptical yarn duct could produce the interlaced yarn with large number and proper strength of tangles.