... extruder, spiral tube-based company 2, by matching the high reliability of the hardened gear box, low noise, "jingcheng" DM series ... tube-based company2, by matching the high reliability of the hardened gear box, low noise, high transmission efficiency, smooth operation, durable. 3 ... -mode feed-type spiral flow channel, head for the high-quality carbon steel materials, multi-channel by heat-treatment ...