38 pellets conveying system 粒料传输系统 39 blending silos 掺混料仓 40 product pellets conveying system 产品粒料传输系统 41 bagging system 包装单元 42 propylene feed drum 丙烯进料罐 43 propylene feed pump 丙烯进料泵 44 propylene feed guard filter 丙烯进料保护过滤器 45 prepolymerizer feed cooler ...