On January 19 in 2013, Wu Hnmin, chairman of our company with Pan Gong,the senior engineer of Zhoushan quality supervision bureau, together attended the industry standards review conference held by the national standards committee in Xiamen. Finally our company as the first remainings "tapered differential twin screw extruder" national industry standards and as the third author of "parallel direction twin-screw extruder" the national industry standard approved smoothly. This achievement was a new milestone for our company as the first drafting unit of the national industry standard of "conical concentric twin screw extruder". It fully showed the leading position of our company's technical strength in the plastic machine industry!