PolyLab QC with Rheomix 600 is a new modular torque rheometer available from Rheology Solutions . It can be connected to an interchangeable measuring mixer, single screw extruder or conical twin-screw extruder.
A typical mixer test is run at a defined rotor speed (shear rate). The material’s response to the shear is recorded as torque and displayed versus time. Although the temperature of the mixing chamber is constantly controlled, the material’s melting temperature during a test may rise due to the shear introduced.
The recorded “Rheogram” (torque and melt temperature vs. time at constant speed) is characteristic for different material types and blends. It can be used as a fingerprint in quality control for outgoing and incoming product inspections. As changes in torque are related to structural changes in the material, a Rheogram can be used to investigate and verify reactions of different additive types or concentration on the samples melting behaviour.
The HAAKE PolyLab QC Rheomix 600 is used to investigate:
- The melting and degradation behaviour of polymers
- Viscosity when adding nano particles or other additives
- Gelation and plastification behaviour of PVC dry-blends
- Flow and curing behaviour of thermosetting plastics
- The influence of different additives such as carbon black, fillers, lubricants, accelerators and sulphur for rubber mixers
- Masticating and vulcanising behaviour of elastomers
- Oil adsorption of carbon black
- Adsorption of DOP for PVC dry blends
- Torque in regard to individual and combined influences of fillers and additives
- Processability of plastics
- Electric conductivity measurements for rubber mixers