Blister Machine Blister Material PVC Pseudo Fluid

The polyvinyl chloride melt is a non-Newtonian pseudo-fluid. The larger the shear rate, the smaller the apparent viscosity, and the change is quite sensitive. When the temperature is raised, the viscosity does not decrease much. Even if the plastic is below the decomposition temperature, it will cause heat and oxidative degradation due to the high temperature for a long time, which will affect its performance. Therefore, to improve the fluidity of polyvinyl chloride melt, the main consideration should be to increase the shear rate (increase the pressure). In fact, increasing the external force helps the movement of macromolecules, which reduces Tf and enables macromolecules to flow at lower temperatures.