Highlights
Proven Excellence in Rheology
The Rosand RH7 and RH10 series of floor-standing capillary rheometers combine maximum force and speed ranges with a robust H-frame design for operation under high loads.
The new digital drive system gives the Rosand RH7/Rh10 outstanding performance in speed control, accuracy and dynamic operating range.
Determination of Uniaxial and Planar Extensional Viscosity
Extensional viscosity (𝜂e) is a rheological property that significantly affects the processability of polymer melts and the mechanical properties of the final product.
Planar extensional viscosity measures a fluid's resistance to deformation when stretched in two dimensions, unlike uniaxial extensional viscosity, which involves stretching in a single direction. It is crucial in processes like polymer film production and coating applications to predict material behavior and ensure consistent product quality.
𝜂e can be readily determined by inlet pressure drop (𝘗en) measurements using NETZSCH Rosand high-pressure capillary rheometers, orifice dies, and the Cogswell method. However, during Pen measurements, polymer can adhere to the underside of the orifice die, leading to an overestimation of 𝘗en.
To overcome this challenge, NETZSCH offers the new free flow dies. Thanks to its new design, it completely eliminates wall sticking and thus allows an accurate measurement of the entrance pressure drop! Uniaxial and planar 𝜂ₑ can now be easily obtained for different materials under controlled conditions!
Our Quality Promise:
NETZSCH's Unlimited Warranty
At NETZSCH, our commitment to quality goes beyond the instruments themselves. We understand that your investment in advanced technology is a long-term one, and that's why we offer something truly unique – our Unlimited Warranty.
Method
Rheology analyses the deformation and flow of fluids. Traditionally, capillary rheometers have been used to measure the shear viscosity and elasticity of viscous materials at high shear rates.
Our high-pressure capillary rheometers enable controlled extrusion of a sample through a high-precision die. This characterizes the flow properties of a material under high force or pressure and/or high shear rate.
Using the double bore option and a die with unknown length, extensional and shear viscosity can be measured simultaneously as a function of deformation and shear rate. Consisting of several components, capillary rheometry enables a reliable rheological measurement of your specific sample.
Single and twin bore barrel options
for cost effective routine measurement capability through to dual measurements for simultaneous assessment of absolute shear viscosity and extensional (elongational) viscosities.
Maximum drive force (up to 20kN)
and maximum speed (up to 1200mm/min) capabilities enable a wide range of shear rates, and correlation with many real material processing conditions.
Rigid one-piece cantilever frame design
providing extreme mechanical strength and stiffness for a compact bench top unit.
Unique swivel head design
gives easy access to the rheometer barrel for sample loading and instrument cleaning.
Range of optional barrel sizes and barrel materials
to permit measurement of thermally-sensitive, chemically-aggressive or aqueous-based samples.
Easily interchangeable melt pressure transducers
to cover all test requirements – configured with low noise, triple-stage amplifiers for optimized measurement sensitivity at the die entrance.
Precise sample temperature control
using three independent zone heaters, with high accuracy platinum resistance thermometers. High temperature (500°C maximum) and cooling coil options also available.
Specifications
| Rosand RH7/RH10 | |
|---|---|
| Number of bores | Double bore |
| Maximum force | 50 kN for RH7, 100 kN for RH10 |
| Frame stiffness | 250 kN |
| Maximum speed | 600 mm/min for RH7, 1200 mm/min for RH10 |
Dynamic range in speed | up to 400,000:1 |
| Speed uncertainty | < 0.1 % |
| Temperature range | Ambient to 400°C (500°C option) 5°C to 300°C (low-temperature cooling coil option) |
| Temperature control | < ± 0.1°C |
| Bore diameter | 15 mm standard (9.5, 12, 19 and 24 mm bore options) |
| Barrel bore length | 290 mm |
| Barrel material | Nitrided steel standard (Hastelloy or stainless steel options) |
| Pressure transducer ranges | 30000, 15000, 10000, 5000, 3000, 1500, 1000*, 500* or 250 psi |
| Pressure transducer accuracy | ± 0.25% |
| Dies | Tungsten carbide, precision ± 5μm |
| Die diameter | 0.5 to 2 mm (in 0.5 mm increments) and 3 mm standard (other diameters, including fine bore dies, available to special order) |
| Maximum shear rate | up to ≈ 108 s-1 (5 * 107 s-1 for RH7) (depending on die and barrel diameter) |
Proven Excellence in Service
At NETZSCH Analyzing & Testing, we offer a comprehensive range of services globally to ensure the optimal performance and longevity of your thermoanalytical equipment. With a track record of proven excellence, our services are designed to maximize the effectiveness of your devices, extend their lifespan, and minimize downtime.
Unlock the full potential of your equipment with our tailored solutions, backed by years of industry expertise and innovation.
Software
Flowmaster software for comprehensive data acquisition and analysis package
Software Modules and Analysis Functions Included
- Constant shear test
- Extensional test
- Manual control
- Flow/no flow
- Non-NewtonianA non-Newtonian fluid is one that exhibits a viscosity that varies as a function of the applied shear rate or shear stress.Non-Newtonian index
- Bagley correction by orifice die and extrapolation methods
- Rabinowitsch correction
- Hagenbach correction for fluid inertia
- Cogswell convergent flow model and extensional viscosity assessment
- Extensive plot and print options
- Data export
Software Options
- Wall slip analysis (Mooney)
- Melt fracture/flow instability
- Die swell
- Material degradation/Thermal StabilityA material is thermally stable if it does not decompose under the influence of temperature. One way to determine the thermal stability of a substance is to use a TGA (thermogravimetric analyzer). thermal stability
- Low-speed degradation
- Eta-0 (Intrinsic Melt Viscosity)
- StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.Stress RelaxationWhen a constant strain is applied to a rubber compound, the force necessary to maintain that strain is not constant but decreases with time; this behavior is known as stress relaxation. The process responsible for stress relaxation can be physical or chemical, and under normal conditions, both will occur at the same time. relaxation
- Low-level scripting
Related Devices
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