D1-S2-P2-A-Rheologically-optimized
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02.06.2017<br />
Example 2:<br />
Analysis of poor capability<br />
Souce: Master Thesis Arnout Oldenburger , University of Twente (2014)<br />
• The diagram shows the meter weight of a particular tread size for PCR<br />
tyres (silica cap compound) produced over > 10 different runs.<br />
• It can be seen clearly that the uniformity between runs has potential to<br />
be improved.<br />
• Customers frequently ask extrusion line manufacturers how to solve<br />
these kind of problems.<br />
‣ The answer is: Understand the rheology of the rubber compounds<br />
© Harburg-Freudenberger Maschinenbau GmbH<br />
All rights reserved<br />
Dr. Gerard Nijman: Relaxed Extrusion<br />
June 16, 2017<br />
7<br />
Key questions<br />
• What is the nature of the consistency of rubber compounds and how<br />
does it influence the extrudate dimensions?<br />
• How to plasticize a rubber compound and how to deal with extrudate<br />
swell?<br />
• How can a better understanding of the rheology of a rubber compound<br />
contribute to a better extrusion process?<br />
© Harburg-Freudenberger Maschinenbau GmbH<br />
All rights reserved<br />
Dr. Gerard Nijman: Relaxed Extrusion 8<br />
June 16, 2017<br />
4
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