| 【文章摘要】 <正> China began to produce bi-oriented polypropylene (BOPP) film in 1958. Due to its excellent performance,BOPP film has beenwidely used in the food industry and other packaging fields. Since Sinopec Guangzhou Petrochemical Company and Beijing Sixth Chemical Plant imported the first batch of BOPP film production lines in 1982,a lot of |