Measuring nozzle for determination of the viscosity of polymer melt extension

摘要

Measuring nozzle for determining the spreading viscosity of polymeric melts during their production with a flow channel that has a rectangular cross section, which has a transition section (3), which narrows in the direction of flow (8 ), between an inlet section (1) and a discharge section (2) of constant cross section respectively, the transition section (3) presenting a zone on the inlet side (4), in which the reciprocal distance of two opposing first channel walls (7) between two opposing hyperbolic second channel walls (6) is continuously reduced in the direction of flow (8), and a subsequent discharge side zone (5), in which both second walls Paired opposite channel lines (6) are parallel to each other, while both first channel walls (7) arranged between them converge hyperbolically in the direction of circulation (8).