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Hot Embossing by Matthias Worgull

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9.5. Design of Microstructured Molds

Independent of the further application that will determine the kind of structures on mold inserts, simple design rules can be defined regarding the aspects of mold filling, shrinkage compensation, and reduction of load on structures during demolding.

9.5.1. Mold Filling

The filling of a microcavity depends on the cavity size and the related flow length. Here, the design of the cavity is determinant, but mold filling is also a function of the pressure of the polymer melt during the molding state. During mold filling by the velocity-controlled molding state, the maximum pressure is located in the center of the mold (Section 6.4.2). Therefore, the microcavities should be arranged in a way that the cavities ...

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