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LATEST NEWS

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 >>

7th November 2014
RheoPower 4.3 is also available as true 64-bit for heavy computations. Read more >>

20th August 2014
Tommi Borg gives an oral presentation at The International Conference on Polyolefin Characterization (ICPC) September 21-24, 2014 - Valencia, Spain. >>

30th October 2013
New RheoPower 4.2 produce accurate MWD by Multi-Record Analyze. Read more >>

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Simulations for orientation level

Since the modelled and measured MWDs are related to molecular orientations at different deformations, we can use the principle reported to model orientation during flows and for final end products, where a high degree of orientation can cause warping and dimensional deviations over time. This would simultaneously provide accurate and complete pressure data, and an explanation for the entrance effects. Also, the filling phases of high-speed injection moulding could be simulated based on measured data, which is not possible by other ways using the original measured viscosity data for 1840H LDPE.

The orientation for a mobile-phone cover during the filling phase of injection moulding at one layer is shown in Fig in colour, where regions with higher % values are darker (where the orientation was also higher). The filling was complete in 0.3 s, and there was nonhomogeneous turbulence in the orientation at t=0.1 s during the filling phase (as shown in Fig.).




















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