TIANHUA INSTITUTE OF CHEMICAL MACHINERY & AUTOMATION Co.,LTD Located in Lanzhou,P.R.China. Original Lanzhou LANTAI Plastics Machinery Co.,LTD. was organized by rubber & plastics machinery of TIANHUA. TIANHUA has built the Research Center of Polymer Compounding and Extruding of Gansu Province in Lanzhou, and built the largest Manufacture Base of Twin-screw in Nanjing. The comprehensive strength is the NO.1 in the industry.