John Morris

Overview

The RHEOGRAPH 200 N keeps the pressure of the nitrogen acting on the polymer melt constant. Our high-precision pressure control unit can register pressure differences of less than one bar with an accuracy of 0.02%, forming the basis of these highly accurate measurements.

Whyuse nitrogen? Because it makes it possible to achieve unparalleled accuracy!

The RHEOGRAPH 200 keeps the pressure of the nitrogen acting on the polymer melt constant. Our high-precision pressure pressure differences of less than one bar with an accuracy of 0.02%, forming the basis of these highly accurate measurements.
Features

Why Multi-Barrel Measurements?
A nitrogen-driven multi-barrel measurement system is samething revolutionary. For the first time it is possible to simultaneously run multi-point controlled stress measurements (depending on the number of capillaries) - independent of the chosen die geometries - where the same controlled stress is applied. This unique measurement and control concept, for example, allows the design of an automated measurement for the determination of polymer wall slip according to Mooney.

Accuracy has been Improved 20-Fold!
Compared to other commercially available capillary rheometers used in conjunction with DMS-pressure transducers (with a typical accuracy of about 0.5% of full scale), the new nitrogen driven capillary rheometer expands the measuring range towards the smallest still measurable pressures.

The Rheograph 200 features a pneumatically driven piston to assist in the feeding of the sample material and to help with the cleaning and purging of the old material.

Benefits

• The accuracy is increased by a factor of 20 compared to conventional pressure transducers.
• Measuring range extended to very lew viscosity fluids.
• It is possible to perform two constant stress sweeps simultaneously in one experiment.
• Fuily automated test routines
• Easy to operate
• Advanced rheology evaluation program WinRHEO 11 operates under Microsoft Excel and offers many features including different correction and evaluation functions.

This new concept incorporates a high precision pressure controller with an accuracy of 0.02% of the nominal pressure range and aresolution of 0.01 bar.

With this it is possible to evaluate the characteristic "transition zone" between Newtonian and power law behavior in the viscosity curve of many polymers.