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Rheological testing

Rheology is the scientific discipline that deals with the deformation and flow behavior of matter. The main focus of rheology is on investigating the flow and deformation properties of materials under different stresses, temperatures and time windows or frequencies.

The term "rheology" is derived from the Greek words "rheo" (flow) and "logos" (teaching). In its basic meaning, rheology therefore investigates how materials react to external forces and how their structure changes under different conditions. The results of rheological investigations are particularly important for the processing industry, as they provide insights into the flow and deformation properties of materials during production and thus provide information for the design of process machines and their parameterization.

Rheology provides a variety of physical and engineering parameters, including viscosities, shear and strain rates, elasticities, deformations and deformation rates, as well as mass and volume flow rates. Rheological measurements are usually carried out using special devices known as rheometers, which are used to measure these parameters in a laboratory environment, i.e. with small quantities of material under precisely defined conditions.

Martina Schubert
Project Manager | Special Services and Expert Reports
Würzburg
m.schubert@skz.de
Dr. Irene Reuther
Group Manager | Special services and expert reports
Würzburg
i.reuther@skz.de

Weitere Einzelheiten zum Verfahren

Extract from our test methods

Accredited test methods
 

  • Melt mass flow rate (MFR) and melt volume flow rate (MVR) according to DIN EN ISO 1133-1, 1133-2 and ASTM D1238, among others
  • Determination of solution viscosity in accordance with DIN EN ISO 307, DIN EN ISO 1628-1, -2, -3 and -5, among others
     

Non-accredited test methods
 

  • Rotational rheometry (plate-plate and cone-plate geometry)
  • Determination of shear viscosity functions using a high-pressure capillary rheometer (HKR)
  • Dynamic mechanical analysis (DMA)
What types of flow processes can we test?
  • Flow through tubes and capillaries (telescopic shear)
  • Flow in the gap between two parallel flat round plates
Technical test equipment
  • 3 Ubbelohde glass capillary viscometers for determining the viscosity numbers of viscosity numbers and intrinsic viscosities both at room temperature and in the high temperature range
  • 2 melt flow rate testers for determining MVR and MFR values
  • Various rheometers for evaluating the rheological processing properties of polymer melts, adhesives, pastes, oils, greases and gels: Storage modulus, loss modulus, curing kinetics, pot life, flow curve, viscosity curve
  • Dynamic mechanical analysis (DMA) to investigate the viscoelastic material behavior
What are typical areas of application for rheological testing?

Process development and optimization:
Rheological measurements make it possible to understand the flow behavior of plastic melts during manufacturing processes such as injection molding, extrusion or blow molding. This is crucial for optimizing processing parameters and improving product quality.

Quality control:
Rheological tests are used in the plastics industry to monitor material quality and consistency during production. Deviations in rheological properties can indicate changes in material composition or processing conditions.

Material development:
When developing new plastic materials, characterizing their rheological properties is crucial. This helps to develop materials with specific flow behavior, melt stability and processability properties.

Formulation of compounds:
Rheological tests are important in the development of compound materials that combine different polymers and fillers. The rheological properties influence the processability and end applications of such compounds.

Behavior at different temperatures:
The temperature dependence of the rheological properties of plastics is important to ensure that materials remain stable in different environments and applications. Dynamic mechanical analysis (DMA) is a rheological technique that investigates this.

Injection molding and extrusion processes:
Rheological measurements support the optimization of injection molding and extrusion processes by providing insight into melt viscosity and flow behavior during these processes.

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SKZ · German Plastics Center
Friedrich-Bergius-Ring 22
97076 Würzburg

Telefon: +49 931 4104-0
E-Mail: info@skz.de

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SKZ Training Center – Welding
Frankfurter Str. 19 c
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Telefon: +49 931 4104-123
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06118 Halle (Saale)

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31224 Peine

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European Center for Dispersion Technologies (EZD)
Weißenbacher Str. 86
95100 Selb

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Sales partner – Italy
PROCHEMA S.r.l.
Via Buonarotti 175
20900 Monza, Italy

Telefon: +39 039 281561
E-Mail: info@prochema.it

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Plastics Bavaria Equipment & Systems srl
Str. Iancu Jianu, nr. 26
500178 Braşov, Romania

Telefon: +40 268 412 559
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SKZ Standort Würzburg, SKZ Weiterbildung

SKZ – Testing GmbH
Friedrich-Bergius-Ring 22
97076 Würzburg

Tel. +49 931 4104-0

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