Spinning Process Principle of Spandex Covered Yarn

Spandex covered yarn is generally spun on a hollow spindle spinning machine, which is divided into three parts: spandex yarn feeding, stretching and covering, and relaxing winding. When working, the upper and lower groups of hollow spindles (one group for single-layer coating) are driven by the dragon belt to rotate in opposite directions. On the spandex core thread threaded from the hollow spindle. The covered yarn is wound into a parallel bobbin through the yarn drawing roller and the reciprocating yarn guide.

  The stretching zone is between the spandex yarn feeding roller and the drawing roller. In this interval, the spandex as the core yarn will be drafted 2 to 4 times according to the different uses and specifications of the covering yarn. The take-up area is from the drawing roller to the winding roller. Due to the difference in surface speed between the drawing roller and the winding roller, the yarn is subjected to negative draft (ie overfeeding) in the take-up area to form tension relaxation.

Usually the overfeeding rate is 5% to 10% in single-layer coating, and 10% to 50% in double-layer coating with cotton yarn.

1--One by one feeding roller
2—Spandex silk tube
3--Wire guide
4--Dragon belt
5--One hollow spindle
6—Covered wire
7—Bilateral bobbin
8—Balloon guide wire hook
9—Yarn delivery roller
10—press roller
11—Reciprocating motion wire guide
12—Take-up roller
13—Parallel package of covered yarn

Tags :

• Spandex Covered Yarn