Characteristics for processability and flow behavior
Plastics exhibit viscoelastic behavior. This means that they exhibit neither properties of an ideal-elastic solid nor of an ideal-viscous liquid. The KUZ test laboratory has available various rheological testing and investigation methods. They are applied to characterize the flow behavior in the shear rate range relevant to processing and also to investigate the quiescent structure of the polymer at very small deformations or deformation rates.
- Melt Mass Flow Rate / Melt Volume Flow Rate (MFR / MVR)
- Melt rheology with the plate-plate / cone-plate rheometer ► in rotation or oscillation
- Dynamic mechanical analysis (DMA) under various loads ► torsional, tensile or flexural loading
- Solution viscosity (viscosity number - VZ) of various polymers ► PA, PET, PBT, PC, PMMA, PVC (K-value), PLA
- Online rheology at the injection molding machine
Statements on material behavior
- Flow behavior of plastics
- Stiffness and damping behavior
- Softening, melting, crystallization behavior
- Temperature positions of relaxation regions (e.g. glass transition temperature)
- Crosslinking behavior (curing) of elastomeric or duromeric systems
- Macromolecular degradation and build-up (e.g. post-condensation of PA)
- Flow behavior of the polymer melt in the injection molding process
The speed at which new trends lead to changing customer wishes and new products and innovations is constantly increasing. New developments of corresponding materials are expensive and not always necessary. To ensure that you remain flexible and can actively respond to changing requirements, the modification of existing plastics with appropriate additives is an option.
When it gets hot...
One of the characteristic features of plastics is their strongly temperature-dependent material properties. These depend on the type of plastic and the additives used (e.g. impact modifiers, reinforcing materials, etc.). By using polymer blends or radiation crosslinking, an additional increase in thermal resistance can be achieved.