bobbin thread without bobbin

Pre -wound bobbin thread is high technical bobbin applied for multihead embroidery machine. It is 2or 3times longers than the normal thread , it can reduce the number of times of changing thread , hence , it can also improve the output of products , The pre -wound bobbin thread is less 50%loss than tranditiional bobbins (because it won't brought waste if not used up) .Owning to without bobbin ,the head won't touch the bobbin when embroidery , which won't result in no point of needle and breaking of needle head , and reduce the rate of thread -cutting .