doi: 10.3850/978-981-11-0749-8_715
Influence of Process Temperatures on Blister Creation in Micro Film Insert Molding of a Dual Layer Membrane
Timo Wöhner1, Ben R. Whiteside2, Guido Tosello1, Hans Nørgaard Hansen1 and Aminul Islam1,3
1Technical University of Denmark, Department of Mechanical Engineering, Dk-2800 Kgs. Lyngby, Denmark
2University of Bradford, RKT Centre Polymer MNT, BD7 1DP Bradford, United Kingdom
3Technical University of Denmark, Centre for Acoustic-Mechanical Micro Systems, Dk-2800 Kgs. Lyngby, Denmark
Abstract
In this work the suitability of a dual layer membrane, consisting of a non-woven Polypropylene (PP) support and a membrane layer made out of Polyethylene Terephthalate (PET) for Micro Film Insert Molding (µFIM) was investigated. The emergence of blisters at the surface of the PET-membrane layer was observed for some combinations of the process parameters used in this investigation. Since these blisters are not only an optical issue but can also deteriorate the functionality of the membrane, a blister free overmoulding of the membrane is required. In particular the mold and the barrel temperature were found to influence this blister creation. The influence of these two parameters on the amount of blisters and the blister height, characterized by the areal surface topography parameters peak material portion (Smr1) and reduced peak height (Spk), is presented in this paper.
Keywords: Film insert molding, Blister creation, Process temperatures, Micro injection molding.
