Abstract: This paper introduced the structure, application, merits, and progress of planetary roller extruder. Nowadays, the theory study in this field mainly concentrated on the calculation of PRE' parametric and the exploration of PRE' plasticizing efficiency. The improvement of the structure included extending the length of planetary section, the combination of PRE and other extruders. PRE had not been used in processing of PVC only, but also used in the field of wood-plastic composite material, PET, silicon rubber, food and so on.

Key words: planetary roller extruder, Application field, Research Progress, structure, plasticizing effect