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Hot Embossing by Matthias Worgull

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3.7.2. Measurement of Friction between Mold and Polymer

A central task is the development of a measurement method, by means of which static and dynamic friction can be determined during demolding under typical hot embossing conditions. Static and dynamic friction forces in microstructured tools, however, can only be measured as the sum of demolding forces. Detailed analysis fails, as it is impossible to determine normal forces acting on the individual sidewalls of the structured tool, which largely depend on the shrinkage of the component and, thus, on a multitude of process parameters and influencing factors. Moreover, force measurement systems of high spatial resolution, which might be integrated in the microstructured tool, are lacking. ...

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