Spinning mills are designed by the material and targeted yarn count. Once it is fixed, it is not easy to make the factory flexible in material and yarn count especially in ring spinning. However, VORTEX, air-jet spinning machines may make the factory more flexbile. For example, by putting core filament in spinning, if the filament is colored, it is eary to produce "melange" effect yarn, without mixing white and color fiber. Also it is easy to have color vatiation without contamination or cleaning. Also, it is easy to start Coarse count, if the material contains synthetic or synthetic blend. In normal case, the yarn count decides the capacity in preparation line and ring spinning specification, ring diameter or bobbin length. It is not easy to change the yarn count variation, once it is fixed. However, VORTEX wtih core yarn device may make it possible to spin coarse count at the end of spinning process, by adding filament to make the yarn coarse. Thus, VORTEX with core yarn filament device make spinning factory more flexible.