About UsYou Are Here: Home > About Us Shanghai Zhongji Machinery Manufacturing Co. Ltd (“Zhongji” in short) was established in 1992. Our company has 3 factories located at the Qingpu and Jiading Industrial Zone in Shanghai which cover a total area of 50,000 square meters of land, with more than 600 staffs and workers. As the leading and reliable manufacturer of Sandwich Panel Production Lines, PU Foaming Machines and Roll Forming Machines, we are mainly engaged in the research & development of our products, machine manufacturing, plant designing, and talent training. We are the first drafter of the China National Standards for 3D Panel. During the past 20 years, we passed and had been approved for the CE certificate, ISO 9001:2000 Quality Management System Certificate, and have more than 50 patents. The double belt continuous sandwich panel line can produce PU fire-proof board, door board, PU + Mineral wool sandwich panels, and high standard rock wool sandwich panels. PU high pressure foaming machines have different adjustment range.