Specifications: They are used for state manufactured 1332 fype seride spooler,doubling frame,two-for-one twister and other necessary sifuations for taking place of original mechanical small knot fying machine to obtain yarns without warp piecing,improve the quaity of yarn and strengthen the market competitive power. This product can realize Non-piecing connection of yarn to avoid abuse resulting from traditional knot tying. Applicable kind of yarn： Single yarn of cotton,wool,silk,chemical fibre and mixed spinning,ply of pure wool and wool-mixed spinning. Applicable density：60--7tex Piecing strength：not less than 80% of original yarn Piecing diamefer：not treater than 1.3times orininal yarn Pressure of compressed air：0.59-0.64Mpa