Double system has high roller, high-performance sinker, dynamic stitch, motor control reserving carriage,digital technology, high-speed and efficient, to achieve pointelle,tuck, jacquard, intarsia, full needle jacquard, apparent shape, hidden shape, and other irregular patterns. suitable for wool, cashmere, cotton, chemical fiber, silk and all kinds of blended yarn, the production of sweaters, blanket scarfs, gloves, hats and knitted apparel accessories.