A heat pipe includes a pipe containing phase changeable working media therein. The magnetic cladding sidewalls at least partially surround the conductive material and the magnetic cladding cap is substantially recessed within the trench with respect to the top of the trench. The imaging device is built in a mobile phone or the like, for example. The protective film includes a high thermal conductivity layer and a low thermal conductivity layer laminated on the high thermal conductivity layer. Finally, the present invention also includes a printstream aggregation method facilitating the printing of print orders.