Because the production machines of enameled wire are all single-headed pay-off and single-headed take-up, there is no multi-threading. In fact, most multithreaded heads are produced by users-electronics factories. In the process of pay-off, it is necessary to stop and replace the transformer skeleton every few minutes. When the machine stops, the pay-off tension control of some machines is not in place. Due to inertia, the upper coil collapses, pressing the lower thread end. When the machine is restarted, the thread end is pressed and pulled off. Formed the initial chaotic line. If it can't be used normally after disconnection, the spool must be removed from the winding machine for processing. Of course, the treated ones can be used again. However, in the process of dealing with disordered lines, if one line is accidentally broken, it will become a three-headed ..................................................................................................................................., and if two lines are broken, it will become a five-headed. This is the process of "multi-threading". In fact, multi-thread ends are easy to handle: use a sharp blade to pick a few turns of thread, and grab the picked thread ends and pull them up. Until a head appears.