Sport shoes upper made by high frequency welding machine JY15000HR-PLC. with 15kw, ... the molecular heating itself, then combines with the super pressure falling on the mould, which makes the every piece ... machine. 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, ...