the heilongjiang haohua co, ltd is extending its sales market for high-quality products, in keeping with its principle of “promoting the enterprise by improving quality”. at regular meetings on product quality, the company quantitative analyses based on productivity, and product grade, rate, and quality indexes. this led to the recent removal of residues, waste, and impurities on the lower and the upper parts of the stripping tower and to the dredging of waste blocks inside the spiral plate heat exchanger to ensure the normal transfer of slurry and eliminate instability in the pvc resin quality. (by jiang zhongli)