... shoes upper made by high frequency welding machine JY15000HR-PLC. with 15kw, This model can weld and cut ... . To produce 100000 pieces of shoe’s uppers a day, if use sewing processing, we need 360 ... set of sewing machines, but for seamless welding, a pair of shoe’s upper only needs 30-60seconds, ... No.3 Fewer ResourcesAccording to the above data, using sewing machine we need 336 worker whose dairy output ...