RHEOGRAPH auto

The RG auto is a semi-automated capillary rheometer which supports the operator with a high number of viscosity measurements in low and high shear rate range by automation of filling, measuring and cleaning. The tester is particularly used in the quality assurance of polymers.

  • ASTM D3835 (Viscosity)
  • ASTM D5099 (Rubber)
  • ASTM D5930 (TCM)
  • ISO 11443 (Viscosity)
  • ISO 17744 (PVT)

The semi-automated capillary rheometer enables the user to carry out automated viscosity measurements. The main automation modules focus on barrel cleaning, capillary closing as well as capillary pre-cleaining.

Furthermore, we offer external cleaning modules for the rheological tester, such as plunger cleaning. Optionally, the capillary rheometer can be equipped with 25kN or 50kN test force and configured between the single-channel systems with a diameter of 9.5mm or 12mm.

Technical specifications
  • Maximum test force of 25, 50kN
  • Single barrel system with 9.5mm or 12mm
  • Dynamic speed range 0.00004 - 40 mm/s (1:1000000)
  • Adaptive signal resolution of only 0.005 % from the pressure transducer range
  • Temperature up to 400°C (500°C optional)
  • Alternative steel grades for barrel and piston with higher corrosion or abrasion resistance
  • Integrated Cleaning Modules: Sewer cleaning, nozzle sealing, nozzle pre-cleaning
  • External Module: Piston Cleaning Tool

Add-Ons for advanced material characterization

The basic instrument of GÖTTFERT capillary rheometers is designed to carry out viscosity measurements with plastics, rubbers and a variety of other materials. By using modular Add-Ons additional characterization possibilities can be used.

The measuring head is mounted below the die. The measurement can be carried out parallel to a viscosity measurement.

  • Determination of the dynamic and static die swell
  • Evaluation of a die swell profile (BASELL method)
  • Swivel arm with continuous height adjustment
  • Laser measuring head in 0.1 μm or 7 μm version
  • Optional with automatic melt cutting device
  • Optional: acquisition of two strings simultaneously
  • Application: Simulation of material swelling behaviour during extrusion

 

Applications

PVT isobaric

This procedure is standardized in ISO 17744 for piston operated instruments. Isobaric PVT measurements are performed at constant pressure...

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PVT isothermal

In isothermal PVT measurement, the measurement process starts at room temperature after the material is filled at melt temperature and...

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Bagley Correction

The Bagley correction is needed to calculate the inlet pressure drop when round hole capillaries...

 

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Weißenberg-Rabinowitsch Correction

Due to shear thinning of polymer melts with pseudoplastic flow behaviour a strong flection of the...

 

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Thermo Stability

Plastics have the property of aging through thermal or mechanical stress...

 

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Melt Elasticity/Strength

The melt strength (elasticity) is determined by withdrawing an extruded strand of capillary rheometer...

 

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Counterpressure chamber

The counter pressure chamber, which offered by GÖTTFERT as an optional Add-on ...

 

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Flow Instabilities (Shark-Skin)

The Shark-Skin effect occurs during the extrusion of plastics, elastomers or food and manifests...

 

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Thermal Conductivity

The measurement of the thermal conductivity is carried out by means of a probe...

 

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Extensional viscosity (Cogswell Modell)

The extensional viscosity can be calculated with measured data of a capillary rheometer...

 

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Die Swell Measurement

The Die Swell measurement is one of many available add-ons for the series of GOETTFERT capillary rheometers...

 

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