The injection-rolling nozzle is one of the most important components in polymer's continuous injection direct rolling process. The basic theory for molten polymer mould channel design and the advantage of extrusion channels lead us to design a new channel for the injection-rolling nozzle. Simulation results show whether the channel structure design is feasible, and will allow the molten polymer flow to be even, yet also optimized for uniform velocity. The finite element method is used to optimize several key structural parameters for nozzle, which are then used as optimization object parameters. Compared with the previous results, molten flow velocity is more uniform after optimization. The velocity difference of 0·3 mm s −1 is slower at the outlet compared with 60 mm s −1 , and the total length of the nozzle has decreased. Finally, experiments results show that the channel with optimization has better flow speed uniformity.

A vane extruder consists of a group of vane plasticization units that can together be considered a vane pump. During extrusion, materials in the extruder are plasticized and conveyed by positive conveying and suppressed by normal stress. A mathematical model of the pumping capacity of polymer solids in the vane extruder is established based on its structure and conveying mechanism. The minimum bulk density under atmospheric pressure and leakage coefficient in this model are obtained experimentally. Four general polymer materials are chosen to investigate the pumping conveying capacity of polymer solids in the vane extruder. The experimental results of the first vane plasticization unit show that the pumping conveying capacity increases almost linearly with the rotor velocity and is only slightly influenced by the material properties. Furthermore, the leakage coefficient increases when the temperature and velocity in the vane extrusion process are set inappropriately; this reduces the pumping conveying capacity of polymer solids in the vane extruder.