Material lab testing The Capillary Rheometer

At Primo, our Capillary Rheometer plays a key role in material testing. By measuring how molten plastics flow under controlled temperature and shear conditions, it provides valuable insights into viscosity, processability, and overall material performance.

Understanding Material Behaviour Before Production Begins 

Optimising plastic extrusion starts with understanding how a material behaves under real processing conditions.

At Primo, the Capillary Rheometer is an important tool in our material laboratory. It measures how molten plastics flow under controlled temperature and shear conditions, providing valuable insight into viscosity and flow behaviour.

This information helps our specialists understand how a material is likely to behave during extrusion — before production starts.

Understanding Flow Behaviour in Extrusion

In extrusion, material behaviour has a direct influence on process stability and product quality. Differences in viscosity and flow behaviour can affect wall thickness, dimensional stability, surface finish and mechanical properties. 

Without reliable material data, process optimisation can become a matter of trial and error. This can result in longer start-up times, increased scrap and unnecessary production delays. 

A Capillary Rheometer replaces assumptions with measurable data. By characterising the flow behaviour of a material at relevant processing temperatures and shear rates, we can better understand how it will behave in an extrusion process. 

This allows process conditions to be selected and adjusted with greater confidence, helping to create more stable and predictable production.

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From Material Data to Die Design

The value of rheological data goes beyond material selection and process optimisation. The flow data obtained with the Capillary Rheometer can also be used as input for flow simulations during extrusion die design.

By incorporating the measured viscosity and flow behaviour of the material into the simulation, engineers can predict how the polymer will flow through the die before the die is manufactured. This provides valuable insight into pressure distribution, flow balance and potential areas where the die design may need to be adjusted.

Combining accurate material data with flow simulation significantly reduces the need for trial-and-error during die development. Potential design issues can be identified and addressed digitally before manufacturing and testing the die.

Instead of manufacturing a die, testing it, modifying it and testing it again, more development work can be done virtually. This can shorten development time, reduce the number of trial runs and minimise material and production costs.

From Material Validation to Full-Scale Production

The Capillary Rheometer is also valuable during material selection and validation.

Before a material is introduced into full-scale production, its flow behaviour can be compared with defined requirements or reference materials. Potential processing issues can therefore be identified at an early stage, reducing technical risk and avoiding costly surprises during scale-up.

The result is a more informed development process, shorter optimisation cycles and greater confidence that the selected material will perform as expected in production.

Better Material Data. Better Extrusion Decisions

For extrusion manufacturers, rheological data is not simply a laboratory measurement. It is a practical tool that connects material characterisation, flow simulation, die design and production optimisation. 

By combining Capillary Rheometer measurements with flow simulation, practical extrusion experience, material expertise and R&D capabilities, Primo can help customers:

  • Understand material flow behaviour

  • Use accurate material data in extrusion flow simulations

  • Optimise extrusion die designs before manufacturing

  • Reduce trial-and-error during die development

  • Shorten development and start-up times

  • Improve process stability

  • Reduce material waste

  • Support consistent product quality

At Primo, the Capillary Rheometer is one of many advanced tools in our material laboratory. Together with our technicians, R&D specialists and material experts, it helps us evaluate materials, simulate extrusion processes, optimise die designs and develop reliable extrusion solutions tailored to each application.

Accurate material data helps us simulate the flow before we manufacture the die. Better input leads to better designs, fewer trials and faster development.

Want to optimise material performance and reduce development time? Contact Primo to discuss your next project. 

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Primo provides extensive expertise in materials, processing, and manufacturing of extruded plastic profiles and gaskets.  As a global company, the Primo Group proudly employs over 1,000 skilled professionals across Europe and Asia.  Our commitment to excellence ensures that we deliver world-class products and solutions to our valued end customers, making a positive impact in diverse industries worldwide.

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Jaakko Salo
Jaakko Salo
Group Commercial Director

Jaakko Salo is the group's head of sales, with a broad understanding of the different markets and industries. In close collaboration with Primo’s dedicated sales teams, Jaakko is your guarantee for a future-fit approach to product development. In the area of sales development, Jaakko is at the forefront of the search for advanced solutions with a lower carbon footprint and faster time-to-market, in line with our FUTURE FIT programme and our slogan "Profiles of Tomorrow".
Speaks: English, Finnish

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About Primo

Headquartered in Copenhagen, Denmark, Primo A/S operates 11 sales and production sites across Europe, China and the USA.  Founded in 1959 by the Grunnet family, Primo specializes in custom-designed plastic profile solutions. The company employs around 1000  people and reported a turnover of 180  million EUR as of December 31, 2024.