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Islam A.,Technical University of Denmark | Hansen H.N.,Technical University of Denmark | Marhofer M.,Technical University of Denmark | Bondo M.,SONION Roskilde A S
Proceedings of the 11th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2011 | Year: 2011

Two component (2k) injection moulding is growing rapidly even in the field of precision micro moulding. Besides combining different material properties in the same product, two component moulding can eliminate many assembly steps in manufacturing process chain. One of the biggest technical challenges associated with 2k moulding is the unavailability of suitable material combinations which can meet the diverse requirements both from product and process point of view. This paper presents a new pair of commercial polymer materials (BASF Ultramid A3EG10 and Kraiburg TPE Thermolast K TC5PCZ) that fulfils the criteria for 2k moulding both from product and process considerations. Ultramid A3EG10 is PA6.6 thermoplastic with 50 % glass fibre reinforcement. Thermolast K TC5PCZ is a thermoplastic elastomer based on hydrated styrene block copolymers (TPE-S). By using this pair of materials, a demonstrator 2k micro part (Socket house for hearing aid) has been fabricated by the use of state-of-the-art 2k micro moulding machine. The tests performed on the demonstrator showed potential for the material pair to be used in high precision two component moulding applications. All the test procedures and results presented in this paper can be a valuable source of information for researchers and scientists who work with two component micro injection moulding.


Islam A.,Technical University of Denmark | Hansen H.N.,Technical University of Denmark | Risager F.,Sonion Roskilde A S | Tang P.T.,IPU
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2014

The trend towards miniaturization is ever going in the hearing aid industry. The Moulded Interconnect Device (MID) technology can offer the unique possibility to reduce the size of the hearing aids by combining electrical and mechanical functions in the same components. On the other hand, one of the main concerns for MIDs in hearing aids is the corrosion of metal tracks. This paper investigates the corrosion of the MID parts based on different base materials, layer thickness and mechanical wear of the MIDs. The results presented in the paper will be useful for designing MIDs in hearing aids and other electro-mechanical applications. Copyright © (2014) by the Society of Plastics Engineers.

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