The RHEOGRAPH from GÖTTFERT is a modular platform for the advanced characterization of polymers. The capillary rheometer serves as the basic instrument to which various additional add-ons can be added. The RHEOGRAPH can thus be optimally adapted to the individual requirements of each application. With the fully equipped version, the processing behavior can be characterized completely.
All GÖTTFERT capillary rheometers serve as platform for the following modular add-ons:
The SHARK-SKIN measuring head is mounted at the bottom of the test barrel instead of the capillary. With this option it is possible to measure exactly at which critical shear rates surface inhomogeneities occur.
The sensor for thermal conductivity is mounted just like a standard piston. The barrel is closed at the bottom during the test. The thermal conductivity measurement of solids or melt is performed under stationary conditions.
The CONTIFEED is a mini-extruder which directly feeds the test barrel of a capillary rheometer. This add-on is particularly suitable for thermally unstable material, due to the reduced dwell time. The plasticizing with pre-shearing in the extruder, makes the measuring process very similar to the production process.
The advantages of the CONTIFEED:
Besides the PVT 500, GÖTTFERT also offers the PVT-measurement as an add-on for the capillary rheometer. The measurement characterizes the material specific dependencies between pressure, specific volume and temperature.
The drawability of polymer melts is of utmost importance in many processes of plastics production and processing.
The patented RHEOTENS method has proven to be an extremely sensitive measuring principle that delivers highly reproducible results to show even minimal batch fluctuations.
In addition to the already existing constant speed and constant acceleration, exponential acceleration is now also possible. The determination of the extensional viscosity function according to Prof. Wagner is an integral part of the RHEOTHENS.
The RHEOTENS is well suited as a processability test for materials used in extrusion or film applications.
Our newly developed HAUL-OFF with a maximum speed of 2000 m/min is particularly suited for the characterization of fibre-grade materials. The system can be operated with constant acceleration or at constant speed steps. The pull-down force is measured via a smooth-running, anti-stick coated measuring wheel on a highly sensitive force transducer.
The measuring head is mounted below the die. The measurement can be carried out parallel to a viscosity measurement.
The viscosity of polymers can also depend on the general pressure level. The Counter Pressure Chamber is mounted behind the die and generates a back-pressure at the die outlet, which is measured with an additional pressure sensor.
