... , enlarged the working fime, and makes the rounding thread axis rotational speed to 3800 round/min. Producing speed increase 1/3.2 ... reduced the heat generated by friction, makes thread unconnected. hold the shape, not easy to broke. No. of bobbins Feed in 70 ... offer oil system is added, uniform filling for the thread, not easy to offer the thread, more uniform pattern, more three-dimensional sense.