By adding auto-control driving servomeechanism system on DB200SN rotor spinning frame,pure cotton bunchy yarn of rotor spinning is spun by changing the drafting ratio with different feed quantum.

• 在2种长丝超喂率下,通过调整复合纱的捻系数使棉纤维和涤纶长丝复合以纺制不同类型的转杯纺复合纱。