Laboratorio – Polylab QC


Measuring Methods Using


  • gas flow
  • electric conductivity
  • capillary viscosity

Applications driven by intelligence
Measuring options provided by the HAAKE PolyLab QC

 Mixing, Kneading, Compounding and Plasticizing

In conjunction with measuring mixers the HAAKE PolyLab QC offers a wide range of different applications.
A typical mixer test is run at a defined speed (shear rate) versus time, and the material’s response is recorded as torque. This “Mixer-Rheogram” (torque, melt temperature vs. time at constant speed) is characteristic for different materials or blends and is often used as a “fingerprint” in quality control for incoming or outgoing product inspection.

Typical Investigations

  • Testing the melting and degradation behaviour of polymer melts
  • Quantifying viscosity when adding nano-particles and other additives
  • Testing the gelation- and plasticizing behaviour, as well as the thermal stability of PVC dry-blends
  • Measuring the flow- and curing behaviour of thermosetting compounds
  • Recording the masticating and vulcanizing behaviour of elastomers
  • Performing electric conductivity measurements during the mixing process

Melting, Conveying, Comperssing, Compounding

Extruders are melting, conveying and compounding polymers under temperature, pressure and shear. The extruded polymer is pressed through a die to form a solid material such as a profile, sheet, film, strand or fibre.
The extrusion process is characterized by monitoring processing power (torque), temperature, pressure and throughput. Special rheological dies (slit, rod) allow the determination of shear viscosity at defined shear rates.

Typical Measurements

  • Simulation of production processes like blown film, wire coating, profile extrusion
  • Testing individual and combined influences of additives (stabilizer, lubricant) and functional additives (antioxidation, UV-stabilizers, pigments and fillers)
  • Investigating the extrudability of newly developed materials
  • Manufacturing films, sheets, strands and profiles for optical, mechanical and weathering tests
  • Measuring rheological behaviour (dynamic viscosity)
  • Compounding and blending of polymers, fillers and additives
  • Dispersion and exfoliation of Nano-fillers in a polymer matrix
  • Small scale production

Flowcurve LLPDE

On-line capillary rheology with HAAKE PolyLab QC is performed using a well defined die geometry (slit or capillary) on an extruder.
The shear stress is derived from the pressure drop in the die (CAN pressure transducer signals) and the shear rate from the weight of the extrudate in a defined period of time.


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