Because Siro spun cotton yarn is fed into the spun yarn drafting area by two strips with a certain spacing, they are drawn separately and twisted into yarn. There is a situation where the two strands have a broken end and the other runs a single yarn. In addition, when the spinning tension is stable, the yarn is spun continuously, resulting in a wrong yarn count. In order to ensure the spinning quality, a single yarn of Siro spun cotton yarn needs to be installed to interrupt the assembly. Single yarn interrupted.