Cotton siro compact spinning

Siro spinning is also known as double-twist spinning, and it is called A and B yarn in China. Recently, it was officially designated as Siro spinning. Siro spinning is to feed two rovings with a certain distance on the spinning frame. After being drafted, the front roller outputs the two single-yarn slivers. Due to the transmission of twist, the single-yarn slivers have a small amount of The twist is further twisted into a twisted yarn similar to a ply after splicing, which is wound on the bobbin.