Therma-flo is the first measuring method to characterize a flowing polymer melt during the injection molding process.
For many applications, classical rheometer measurements are used for the rheological characterization of polymers. From this, for example, an MFI value is derived which allows a statement to be made about the flowability of the polymer melt. However, these rheometer measurements are more comparable to an extrusion process than to an injection molding process. A statement on the material behaviour during injection moulding can therefore only be derived to a limited degree. For example, classical rheometer measurements do not take into account the influence of the plastification unit, the interaction between mould temperatures and the melt, the wall thickness of the component and finally the pressure-dependent viscosity.
The Therma-flo characterization measures the flow behavior directly in the injection molding process and thus provides the customer with
- a realistic prediction of the pressure requirement as a function of wall thickness and temperature
- an opportunity to verify the quality and plausibility of simulation input data and results
- a possibility to directly compare different materials for each specific application with regard to technical and economic aspects
- a simple preliminary analysis to evaluate the influence of the wall thickness on the filling pressure, as well as the sensitivity with regard to the melt temperature and injection speed without the modeling effort of a complete simulation.