Laboratory Single Screw Extruder can be integrated by main unit and single screw extrusion unit. The screw with different structure,diameter, length-diameter radio and compress ratio can be chosen depending on the sample material. Integrating different extruding dies and other auxiliary equipment, the system could simulate many functional experiments in the laboratory.
Equipped with capillary dies, the extrusion unit could be used to measure the melt viscosity over a usual shear rate range. This so called extruding capillary Rheometer could obtain the viscosity information closed to extruding process. The melt flow and die pressure can be obtained under different rotation speed, by changing the screw speed and die cores with different length-diameter ratio, the relation between shear rate and melt viscosity can be calculated with software after dies entrance pressure calibration and nonlinear calibration.
The correlation of material's viscosity and shearing speed and the relationship between its viscosity and shearing stress can be measured through Capillary Die. The principle of polymer's viscosity can be presented in the following way. η=τ/γ τis shearing stress with the unit of kg/cm2 . γis shearing speed with the unit of 1/s. τand γ are acquired by pressure difference of tubule ends and extruding amount of fusant respectively. Test the pressure difference of two ends of tubule and the extruding amount of fusant, through changing rotating speed of extruder screw from 5 to 100 rpm. Save all experiment data. And open the data file by software HPVisco. The data curves will be output on two coordinates with γ-ηand γ-τrespectively..
){kind=link}