Transactions on Additive Manufacturing Meets Medicine
Vol 3 No 1 (2021): Trans. AMMM
https://doi.org/10.18416/AMMM.2021.2109537

Material Properties, Structural Designs, and Printing Technologies, ID 537

Rapid tooling for micro injection molding of micro medical devices via digital light processing

Main Article Content

Robert Mau (Microfluidics, University of Rostock, Rostock, Germany and Department Life, Light & Matter, University of Rostock, Rostock, Germany), Gabór Jüttner (Kunststoff-Zentrum in Leipzig gGmbH, Leipzig, Germany), Ziwen Gao (Clinic for Oto-Rhino-Laryngology, Hannover Medical School, Hannover, Germany), Farnaz Matin (Clinic for Oto-Rhino-Laryngology, Hannover Medical School, Hannover, Germany), Dorian Alcacer Labrador (HörSys GmbH, Hannover, Germany), Felix Repp (OtoJig GmbH, Hannover, Germany), Samuel John (HörSys GmbH, Hannover, Germany), Verena Scheper (Clinic for Oto-Rhino-Laryngology, Hannover Medical School, Hannover, Germany), Thomas Lenarz (Clinic for Oto-Rhino-Laryngology, Hannover Medical School, Hannover, Germany), Hermann Seitz (Microfluidics, University of Rostock, Rostock, Germany and Department Life, Light & Matter, University of Rostock, Rostock, Germany)

Abstract

High-resolution additive manufacturing methods such as digital light processing (DLP) offer promising opportunities for rapid tooling for micro injection molding (µIM). There are possible savings in time and costs for µIM of small and micro plastic parts for sensors, electronics and (bio)medical products. Here we present the rapid tooling of polymeric molds via DLP 3D printing for the µIM of convex chips (Ø3.5 x 1.16 mm) of polypropylene (PP) as exemplarily chosen geometry and medical relevant material. Five molds (one mold has a total size of 8 x 22 x 10 mm, height x length x width, made of 2 pieces) were 3D printed simultaneously in t ~ 30 min (plus t = 10 min post-curing) with a layer height of z = 50 µm and a photopolymer consumption of m ~ 2 g per mold. The micro-injection-molded PP chips show a significant staircase-effect as a result of 3D printing of the molds. Nevertheless, the molds perform well (no cracks, adequate demolding) when used for a relatively low number of µIM cycles (n ~ 20, Tmold = 30 °C, TPP = 205 °C).

Article Details

How to Cite

Mau, R., Jüttner, G. ., Gao, Z., Matin, F., Alcacer Labrador, D., Repp, F., John, S., Scheper, V., Lenarz, T., & Seitz, H. (2021). Rapid tooling for micro injection molding of micro medical devices via digital light processing. Transactions on Additive Manufacturing Meets Medicine, 3(1), 537. https://doi.org/10.18416/AMMM.2021.2109537

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