The new issue of RFP Rubber Fibres Plastics is out!
Learn how natural rubber can be part of the climate change actions (IRSG, CIFOR/FTA, CIRAD) and how renewable carbon can become an alternative carbon source for the chemical and plastics industry. Read the summary of an independent academic study presented in August 2020 on Continental’s role in the Third Reich and how Fraunhofer LBF enables dynamic plastics testing even at low temperatures without thermal chamber. Find reports on the Virtual double event Foam Expo Connect and Adhesive & Bonding Expo Connect as well as the 30th International Colloquium Plastics Technology of the IKV, which was held as a virtual conference as well, and a Preview to Chinaplas 2021.
- Lara Dammer and Michael Carus from nova-Institute give an overview on the EU Circular Economy Package and Plastics Strategy and explain what they mean for biobased
- Joachim Bertrand (Behn Meyer Europe GmbH) shows ways to significantly improve both the technical performance and the processing of tire tread compounds and to reduce resource consumption by using optimized surface-modified silica.
- Dominik Schramm and Thomas Schmid (CooperStandard) propose a lab method to get access to the extrudability of compounds by means of lip shaping by using a 5-finger die.
- Sahbi Aloui, Wiebold Wurpts and Horst Deckmann (Netzsch Gerätebau GmbH) conclude their article series on methods for simultaneous dynamic-mechanical and dielectric analysis with part 3: dielectric investigation of elastomer composites under dynamic deformation.
- Christoph Zimmermann and Christian Hopmann (IKV at RWTH Aachen University) describe the development of a visco-elasto-plastic material model for thermoplastic elastomers for efficient testing.
Technical articles in this issue:
- The EU Circular Economy Package and Plastics Strategy
L. Dammer, M. Carus (nova-Institute)
Very few policy initiatives in the last few years have received as much public attention as the recently adopted Single-Use Plastics Directive – also known as the single-use plastics ban. This legal act, however, is only one piece of the puzzle with which the European Union is attempting to curb plastic littering and transform the European economy into a circular one. The following article gives an overview on the EU Circular Economy Package and Plastics Strategy and explains what they mean for bio-based plastics.
- New modified silica for optimized tire tread development
J. Bertrand (Behn Meyer Europe GmbH)
In addition to high performance targets for tires, modern car tread development places increasing value on problem-free and resource-saving processing. In the course of the introduction of silica mixtures and their optimization over the past 25 years, the processability of the increasingly filled mixtures became more difficult and more energy intensive. The next step in improving both tire performance and compound processing is the fundamental chemical redesign of the raw materials rubber and filler. This article shows ways to significantly improve both the technical performance and the processing of tread compounds and to reduce resource consumption by using optimized surface-modified silica.
- Access to compound extrudability by using a 5-finger die
D. Schramm, T. Schmid (CooperStandard)
The work presented in this paper proposes and describes a lab method to get access to the extrudability of compounds by means of lip shaping: the use of a 5-finger die, where the five lips have an increasing degree of difficulty, and also represent the variety of thin profile lips in sealing profiles. In order to mirror the derived 5-finger die results to other existing methods, frequency sweep investigations by using an RPA on the model compound, a DoE study is conducted. If the 5-finger die results are summarized into a single number (like a cost function) a general correlation to delta-delta or shear thinning of the complex viscosity curve can be demonstrated.
- Methods for simultaneous dynamic-mechanical and dielectric analysis – Part 3: Dielectric investigation of elastomer composites under dynamic deformation
S. Aloui, W. Wurpts, H. Deckmann
The carbon black structures in the rubber matrix change under mechanical deformation and can therefore be used as “markers” for condition monitoring of elastomer components. Dielectric analysis is a suitable method for measuring this effect. In order to be able to use it for this purpose, it is necessary to know the exact correlation between the mechanical and dielectric properties of the material. The key to understanding this correlation lies in the use of simultaneous dynamic-mechanical and dielectric analysis. The concluding third part of this series presented here, deals with the influence of dynamic-mechanical deformation on the dielectric spectra of a carbon black-filled styrene butadiene rubber (SBR) under dynamic-mechanical deformation.
- Efficient testing and development of a visco-elasto-plastic material model for thermoplastic elastomers
Ch. Hopmann, C. Zimmermann
Thermoplastic elastomers (TPE) show a strong non-linear material behaviour in combination with a stress softening after initial loading and a high residual deformation after unloading. This material property depends on the stress state as well as on the temperature. In order to consider this characteristic during the design and development of TPE parts, suitable material models have to be developed.
Further information about the new issue at https://www.gupta-verlag.com/magazines/rfp-rubber-fibres-plastics-international/04-2020.