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Influence of thermo-mechanical wear on the deposit formation on coated steel surfaces in plastics processing machines

Influence of thermo-mechanical wear on the deposit formation on coated steel surfaces in plastics processing machines

Project managers: Prof. W. Maus-Friedrichs and Prof. V. Wesling

Funding period: 01.01.2019 - 31.12.2020

Funded by: BMWi via AiF

Funding-Number: 20333 N / 2

Contact: Dr. R. Gustus, Dr. R. Reiter

In the plastics processing industry, the formation of unknown deposits at the interface between polymer melt and steel surfaces can pose major challenges, which occurs especially on screws, barrels and tools. If deposits form on melt carrying machines and tools, there is no material exchange with the flowing melt. As a result, the material degrades and later deposits will detach during production and lead to quality restrictions mostly as spots in the products. The formation of deposits is a phenomenon for which there is still no reliable and effective remedy. In practice, thin coatings are often applied to machine and tool surfaces to reduce deposit formation.

Within the framework of two projects already funded by the AiF (IGF 18561 N and 403ZN), the mechanisms of adhesion and deposit formation on pure and coated steel surfaces were systematically investigated. The focus was on the early stage of polymer melt adhesion and deposition.

Within this new project (20333 N / 2) funded by the AiF, the role of thermomechanical stress and the cleaning procedure to the coatings surface and it protective function will be investigated. Suitable guidelines and recommendations will be propose. The guidelines should include the thermomechanical design of the components with regard to permissible deformation, the design of the coating systems with regard to sufficient ductility, as well as recommendations for cleaning processes.

 

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