The Rosand RH7 and RH10 are used in hundreds of research laboratories globally and the robust H frame design permits operation under ultra-high loading conditions, as well as providing optimized space for multiple accessory configurations.
Research-level Rosand RH7 and RH10 capillary rheometers offer high-flexibility measurement capabilities for high pressure materials and high shear rate extrusion from polymer melts to ceramics, and from foodstuffs to inks and coatings.
The key features of the Rosand RH7 and RH10 are:
- High force range (up to 100kN) and wide dynamic speed range (>225,000:1) permit test correlation with real material processing conditions.
- Twin bore barrels as standard enable absolute shear viscosity measurements and simultaneous calculation of extensional viscosity.
- Range of optional barrel sizes and barrel materials to allow measurement of thermally sensitive, chemically aggressive or aqueous-based samples.
- Precise sample temperature control using three independent zone heaters, with 10 times DIN accuracy platinum resistance thermometers. High temperature (500ºC maximum) and cooling coil options also available.
- Rigid ‘H’ frame design for compliance-free measurements in transient tests such as pVT determination.
- Open design below barrel exit to accommodate optional accessories such as die swell measurements, melt cutters, slot die system and melt strength (Haul Off).
- Wide range of high precision tungsten carbide dies as standard to cover all materials and test types.
- Easily interchangeable melt pressure transducers to cover all test requirements
- Nitrogen purge option available for testing in a dry, inert atmosphere to minimize sample degradation.
- Integral fume chamber with extraction to vent sample gases for operator safety.
- Proprietary bi-modal speed control algorithms suited to low and high speed operation optimize shear rate measurement range for a particular die.
Evaluating different operating regimes with a process model is quicker and less expensive than with an equivalent laboratory or pilot program but the quality of the simulation is key. Malvern Panalytical rheometers can provide the material data that Compuplast software requires to develop a simulation that accurately reflects process behavior. Simulating alternative operating strategies, equipment designs or materials identifies an optimal operating condition.
John Perdikoulias, Vice President, Compuplast