Differential Shear-Compression Theory of Solids Conveying in Vane Extruder

Based on the study of the solids conveying in the vane extruder, a new concept of the differential shear-compression theory is presented. The objective existing of shear and compressive forces is proved by the mathematical method. And the exerted force is proved to be depended on the compression displacement and the differential of compression speed when solid materials are transported in the solids conveying zone of the vane extruder at any moment. Because of the rotor eccentricity to the stator, a conveying mathematical model between the thickness of the material differential laminate and the rotor angle is established. The nonlinear function E(β) andG(β), related to the thickness, density and compactness of materials are obtained through experiment, and the radial force of inner surface of the stator acted on the differential laminate is calculated by the Hooke's law. Based on the torque balance of the material laminate, the force is calculated by integration in the chamber. The finite element analysis of the mathematic model are applied to verify the validity of the differential shear-compression theory, which is also practical to metal material rolling, high pressure double roll crush and other processes with converging geometry.

Power Consumption Analysis of Polymer Solids Discharging Process in Vane Plasticization Extruder

This paper deals with the study of power consumption in the discharging process of polymer particulate solids in a vane plasticization extruder. The structure and operating principle of the innovational vane extruder are completely different with conventional screw extruders. The process of conveying materials in vane extruder is based on volume transportation. Solids conveying zone is the first section of polymer processing in extruder. Large amounts of energy are consumed in the zone. The solids conveying process is composed of feeding, compacting and discharging process in the vane extruder. The discharging process is very unique and worthy of further study because of the particularity of the vane extruder. A mathematical model has been developed to analyze the power consumption in the process. The model shows the structural parameters have significant influence on the power consumption. In addition, the model is verified by experimental results.