The expansion dryer is the critical equipment for the finishing unit of rubber plant.It can remove 90% moisture from the rubber melt. Based on FLUENT software, the flow of rubber melt in the runner of expansion dryer was numerically analyzed. Under different production conditions, such as pressure difference between inlet and outlet, screw speed and so on, the flow law of rubber melt in the runner of expansion dryer was analyzed according to the velocity and pressure distribution nephograms, so as to improve the quality of rubber.

The expansion dryer was the critical equipment for the finishing unit of rubber plant. It could take off 90% moisture in the rubber melt. The flow behavior of rubber melts in the channel of the expansion dryer was analyzed by FLUENT. Observing the nephogram of the distribution of rubber melts speeds and stress nephogram, the flow rule of rubber melts in the expansion dryer was analyzed. The following research directions were indicated.