Material flow compatible melt handling: More recycling in technically demanding applications

Molten handling compatible with material flow

In the joint venture on materials and long-term properties in recycled materials, Fraunhofer LBF is laying the foundations for increasing the rate of polymerase chain reaction (PCR) for industrial applications in technical plastics. The objective is to find out the dependencies between the composition of the input materials, the influencing factors during formulation and the resulting application properties.

The aging properties of post-consumer recycling (PCR) materials are being evaluated early in the development phase as part of the new joint venture. © Ursula Raapke, Fraunhofer LBF

The plastics industry expects viable and practical solutions that significantly increase the proportion of recycled materials, even in technically demanding applications. While post-consumer recycled (PIR) materials still have a very specific composition, the variety of possible combinations (such as foreign polymers, non-plastic parts, additives, adhesives) and aging cases for post-consumer recycled (PCR) materials is very high and subject to To change regional and seasonal fluctuations at least. These also have an impact on the resulting product properties. For example, processability and mechanical properties generally deteriorate with increasing percentage of PCR in the composite or in the product made from it.

Even the identification and evaluation of suitable extruded secondary materials, such as graded and cleaned or re-grinded chips, requires a significant amount of effort. Downstream steps, eg b. Characterization or quality control, and homogenization are also expensive and often associated with the security of large batches. Complexity increases again due to variables in composition (formulation, process). It is often only apparent late in the development or improvement cycle whether target properties (such as mechanical properties and aging resistance) are achieved as a result and whether they are also reliably controlled by other variables, such as batch-to-batch input material flows . Today, this is often done using the trial and error method.

© Ursula Raapke, Fraunhofer LBF

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