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Capillary rheometry has its origins in polymer melt processing, but is also directly relevant to many other material processes such as high speed coating and printing applications. Based on controlled extrusion of a test material, capillary rheometry enables material flow and deformation properties to be characterized under conditions of high force (or pressure), high shear rate and at elevated temperature.

The basics of the capillary rheometry technique are as follows:

  • The sample under test is loaded into a bore in the temperature-controlled barrel of the capillary rheometer.
  • A capillary die of known dimensions (diameter and length) is mounted at the bottom of the barrel bore.
  • A piston is used to extrude the sample through the capillary die, and the resultant pressure is measured at the die entrance.
  • Shear viscosity is calculated from knowledge of the capillary die dimensions, piston speed and pressure.
  • The shear rate of the test can be varied to produce a flow curve (viscosity versus shear rate).
  • Using a twin bore barrel and a ‘zero length’ die allows simultaneous determination of shear and extensional viscosity.

Capillary rheometry also enables other rheological and process characteristics to be evaluated, including die swell, melt fracture, wall slip, flow/no-flow stress, melt strength, haul off and pVT relationships.

Related products

Rosand range Capillary rheometers for process-relevant material testing. Image
Measurement
Rheology and viscosity
Temperature range
5°C to 500°C
Dispersion type
Dry
Technology
Rheometry - capillary
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Rheology Focus Forum: The importance of good rheological data in co-extrusion processes Webinar - Recorded (English)

The presentation will discuss the coextrusion of two polymer melts in a specially designed die attached to a twin bore capillary rheometer. Physical compatibility and interfacial effects are examined. The melts were characterized in shear and extensi...

Product:
Bohlin range
Date recorded:
November 27 2006
Language:
English


Rheology Focus Forum - Time-Temperature Superposition in Rheology - A Review Webinar - Recorded (English)

Ever since its discovery and critical study by some of the pioneers of polymer rheology and viscoelasticity (Leaderman, Tobolsky, Ferry, Plazek et al), time-temperature superposition (tTS) has proved to be a very useful tool to rheologists, enabling ...

Product:
Bohlin range,Rosand range
Date recorded:
December 19 2007
Language:
English


Best measurement practice for Capillary rheology Webinar - Recorded (English)

This seminar will provide guidance and tips that will help ensure your testing is precise and accurate every time! Even such simple things as correct sample loading and cleaning will have a huge impact on the quality of your data. Other areas covered...

Product:
Rosand RH2000,Rosand RH7/10
Date recorded:
March 14 2007
Language:
English


Using rheology as a Benchmarking tool Webinar - Recorded (English)

The fundamental principle of designing products for various applications lies in the ability to accurately engineer the microstructural properties to achieve the desired performance response. Rheology presents itself as a unique tool to not only prov...

Date recorded:
June 18 2015
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Webinar - Recorded Eastern Time Rheometry - microfluidic flow 

An introduction to capillary rheometry - Evaluating material properties under process relevant conditions Webinar - Recorded (English)

Capillary rheometry has its origins in polymer melt processing, but is also directly relevant to many other material processes such as high speed coating, suspension processing, and printing applications. The technique enables key rheological...

Date recorded:
August 28 2014
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Webinar - Recorded Eastern Time 
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