... Welding,cutting,lace embossing,bronzing,binding,etc, ultrasonic lace sewing machine 1. Features:1) Adopt the Japan piezoelectricity CMOs chip ... alloy steel material is used to make the knurl wheel,the welding head is wearable ,long using life.3 ... . 6) It is easy to change the knurl wheel,according to the needs.7) Continue to work,and ... -woven bags and other products. Ultrasonic lace sewing machine