The Research On Slub Yarn With Yarn Count And Twist Changing Produced By Ring Spinning

Microcomputers (single-chip computers) were used on most of the slub controlling devices of ring spinning machines nowadays. The working principle of this slub controlling device is to control the turning speed of the middle and back rollers of the spinning machine to get the slub yarn. During the developing of new types of slub yarn, it was found that the twists distribution of slub part and of the base part is unreasonable (the twists of the slub part is much more than the other base yarn part along with the increasing of the slub length). In order to solve this problem, a ZP—20D type intelligent controlling system that can control the yarn count and the yarn twists was added on the EJM128K type spinning machine. Two actuating motors were added to the original spinning drive system. One motor is to control the middle-back roller, the other is to control the front roller. A photoelectric sensor was set onto the principal axis of the headstock. The controlling cabinet (PLC controlling system) was set up on the head of the machine. And by properly design the parameters such as fuzzy composition, twists, slub length, coarse and density of slubs, the 72.9tex pure cotton slub yarn for denim with yarn count and twists changing effect was successfully produced. The test result of the yarn shows that the twists of the base yarn part is 52T/10cm which can meet the demand of 52～54T/10cm. The twists of the slub part is 40.6T/10cm which can meet the 40～42T/10cm twists requirement. The tested length of slub is 81.3～90cm and the distance between the slubs is 90.6～99.8cm, which can meet the demand of length of slub as 80～90cm, and the 90～100cm demand on length of the base yarn part. The twists of the base yarn part and the twists of slub part was controlled differently by using the controlling system which can control the yarn count and the yarn twists. The base yarn part was get more twists and the slub part was get relatively lower twists so that the twists of the base yarn part and the twists of the slub part in a same yarn is getting proper.