Mobile phones currently have a very high through put in the market. They contain high levels of valuable metals. Nokia are involved in research into design for disassembly methods to identify the most cost effective ways of disassembling their phones to retrieve the valuable materials. For Nokia - one of the keys to making money from take back, is to recycle as much of the product as possible as there are high value materials in mobile phones (Tanskanen, 2003).
The Nokia 5510 prototype uses smart materials to disassemble the phone into sections when heated. Shape Memory Alloy SMA actuators curve to open the snap fits holding the cover, display and display window in place.
The screws and screw bosses are made out of a Shape Memory Polymer (SMP), such that no extra parts are required for active disassembly. (Tanskanen, 2003)
Visit the Nokia website to view how disassembly works with SMA and SMP actuators.
References: Tanskanen, P. (2003) A New Life for Old Electronics, Nokia Research Centre, Nokia