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LATEST NEWS
10th November 2025
ICPC, Shanghai, China
Tommi Borg: “Structure and Viscoelastic Properties of Polyethylene by Control Theory”
10th March 2025
New book by Tommi Borg, Control Theory in Rheology, Springer International Publishing.
Read more >>
16th April 2022
Tommi Borg visits for your meetings at
AERC 2022, in Seville, Spain, 26th-28th April 2022.
14th November 2019
Updated RheoPower 5.1 package is now available.
Read more >>
24th September 2018
64-bit RheoPower 5.0 analyses still more accurate thanks to developments. Easy to deploy databases.
Read more >>
16th April 2017
Tommi Borg visits for your meetings at
Chinaplas May 16-19, 2017 - Guangzhou, PR China.
24th November 2015
New published paper
"Linear viscoelastic model for different flows based on control theory",
Appl. Rheol.
Read more >>
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RheoAnalyzer
From measured viscoelastic properties to the structure analyses as MWD and LCB
Accurate results
The quality of fit is evaluated by calculating the percent root mean
square error %RMSE (ref 1).
The data for Cross, Bersted and Neural Net models have the same source.
If data is relatively accurate, it is possible to find the MWD and
other structure properties.
The typical %RMSE-errors of different
known models and computation levels of RheoAnalyzer. Click on the figure to
zoom it.
1. de Vries S. A., L. T. Kale, T. Oswald, and T. P. Karjala, "Molecular
structure - Linear viscoelastic properties modelling for constrained
geometry catalyst polyolefin resins", XIIth Int. Cong. on Rheology,
Quebec (1996).
Applications
Control tool of polymerization can also be used with continuous on-
line devices.
Easier to generate tailored polymers.
Design aid for extrusion dies and processes.
Data feeder for injection mould design tools such as CAD/CAE/CFD simulation software.
General knowledge of relations and structure.
New winds for measurements
The RheoAnalyzer shows relatively absolute error, by which is possible
to develop measuring methods and customs.
Software can be very sensitive to some measuring methods, such as
start-up procedures.
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