SHANGHAI HONGJIN ULTRASONIC ELECTRONIC EQUIPMENT FACTORY is a professional ultrasonic welding machines manufacturer with more than 10 years experiences offering ultrasonic plastic welding machine, ultrasonic sewing machine Ultrasonic spot welding machine, spot welder ultrasonic metal welding machine, automatic sponge scrubber making machine geocell production line, geogrid production line non woven bag making machine,etc.br< br