Shanghai Zhongji Machinery Manufacturing Co., Ltd Was established in 1992. Our company has 3 factories in Shanghai which cover a total area of 50,000 square meters of land, with more than 600 staffs and workers. We are the leading and reliable manufacturer of PU/mineral wool sandwich panel production lines, EPS/EPP machines,3D panel machines and roll forming machines, We are the first drafter of the china national standards for 3D panel. During t