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Impact of melt viscosity changes induced by pellet water absorption on the replication quality of micro needle arrays

: Eigenbrod, Hartmut

Preprint urn:nbn:de:0011-n-2666358 (233 KByte PDF)
MD5 Fingerprint: fc6df828ededc101c0d4388e7da177a8
Erstellt am: 16.11.2013

Azcarate, S. ; 4M Association:
4M 2013, 10th International Conference on Multi-Material Micro Manufacture. Proceedings. CD-ROM : 8-10 October 2013, San Sebastián, Spain
Singapore: Research Publishing, 2013
ISBN: 978-981-07-7247-5
ISBN: 978-981-07-7248-2
International Conference on Multi-Material Micro Manufacture (4M) <10, 2013, San Sebastian>
European Commission EC
FP7-NMP; 260174; IMPRESS
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPA ()
Produktqualität; product quality; process control; injection moulding; Prozessstabilität; Polycarbonat; IMPRESS; Fertigung; Prozessautomatisierung

Micro and nano sized features on surfaces enable new product functionalities. On the lab scale, this has been demonstrated for many applications e.g. for devices with tailored optical or mechanical properties. When process steps are scaled-up in order to establish high volume production, special care must be taken to guarantee the quality of the work pieces. When using (compression) injection moulding for mass production the melt viscosity is a key parameter to achieve good product qualities. In this paper, the impact of water absorption on melt viscosities and work piece qualities is evaluated. Qualitative and quantitative results are presented for micro needle arrays which are produced on the IMPRESS platform (compression injection moulding machine in combination with several peripheral modules).