A common type is the Selfil yarn, which is composed of one strand of staple fibers with some twist and a filament strand wrapped around the staple strand.

• 常用的自捻纱是长丝自捻纱,它包括一根具有一定捻度的短纤纱,还有一根缠绕在短纤纱表面的长丝纱。