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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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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...

Product:
Rosand range
Date recorded:
August 28 2014
Language:
English

Keywords: English Rosand range Rheology and viscosity Rheometry - capillary Polymers, plastics and rubbers Webinar - Recorded Eastern Time 

Polymer solution characterization – Part 4 Webinar - Live (English)

Polymeric materials are the most studied of all rheological materials and polymeric solutions in particular are perhaps the most interesting. They are ubiquitous in every-day life and play an important role in applications ranging from jo...

Date:
September 16 2014
Language:
English

Keywords: English Rheology and viscosity Rheometry - capillary Rheometry - rotational Polymers, plastics and rubbers Webinar - Live Eastern Time Microrheology Rheometry - microfluidic flow 

Reómetros capilares Introducción y aplicaciones en polímeros Webinar - Recorded (Spanish)

Los Reómetros Capilares son los más adecuados para simular los procesos de fabricación de los polímeros. En este webinar veremos la introducción a un reómetro capilar, sus cálculos y algunas aplicaciones con sus resultados.

Product:
Rosand range
Date recorded:
April 19 2012
Language:
Spanish

Keywords: Rosand range Rheology and viscosity Rheometry - capillary Polymers, plastics and rubbers Webinar - Recorded Central Europe Time Spanish 

Reología explicada - Flujo y Viscosidad Webinar - Recorded (Spanish)

Conocimiento de los principios de algunas medidas reológicas fundamentales.

Product:
Kinexus range
Date recorded:
May 28 2011
Language:
Spanish

Keywords: Kinexus range Rheology and viscosity Rheometry - capillary Rheometry - rotational Webinar - Recorded Central Europe Time Spanish 

Introducción básica a reología Webinar - Recorded (Spanish)

Esta presentación cubrirá las diferencias entre un viscosímetro y un reómetro, los diferentes tipos de geometrías que utiliza un reómetro, partes que lo componen y la información que podemos obtener del equipo. Así como algunas aplicacion...

Product:
Kinexus range
Date recorded:
March 21 2011
Language:
Spanish

Keywords: Kinexus range Rheology and viscosity Rheometry - capillary Rheometry - rotational Webinar - Recorded Central Europe Time Spanish 
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Glossary