Compared with traditional double twisting machines, CT1 has made technological improvements on the basis of ST short fiber double twisting machines, significantly increasing the capacity of the ingot can and the winding capacity. The tension and twist control of twisting are more balanced and uniform, making it more suitable for twisting coarse and high-strength yarns. The CT1 carpet yarn doubling machine has the characteristics of large roll and high density. Through a simple twisting process, it provides customers with stable and efficient strand production. This product can be used for twisting various carpet blended yarns such as short fiber yarn, BCF fiber carpet yarn, polypropylene, nylon, polyacrylate yarn, etc. CT1 and CT2 can use both dragon belt transmission and single ingot single control electric ingot transmission, with significant energy-saving effects.