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Project managers: Prof. W. Maus-Friedrichs and Prof. V. Wesling
Funding period: 01.01.2019 - 31.12.2020
Funding agency: BMWi via AiF
Project number: 20333 N / 2
Contact: Dr. R. Gustus, Dr. R. Reiter
For medium-sized plastics processors, trouble-free and reproducible processes are of fundamental importance for their profitability. One of the most common causes of production interruptions and rejects are specks and deposits on mold and machine surfaces. Stippling refers to disruptive inclusions in the plastic material, which can have various causes. 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 detaches uncontrollably in the form of specks under the shear forces of the melt flowing over it. 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 prevent deposits.
As part of two projects already funded by the AiF (IGF 18561 N and 403ZN), the mechanisms of adhesion and deposit formation on clean and coated steel surfaces were systematically investigated experimentally. The focus was particularly on the early phase of adhesion and coating formation of polymer melts.
Within the scope of this new AiF-funded project (20333 N / 2), the role of thermomechanical stress and the cleaning of melt-bearing components is to be examined. Suitable guidelines and recommendations for action are to be derived from this. 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.