Flex printed circuits come in different sizes and shapes. While single-layered varieties work best in devices meant for multiple bending cycles, flex circuits with two or more layers are the perfect fit for devices designed to be used in static applications. The bend radius of a flexible circuit largely governs the mechanical design of the device to which the circuit is to be implemented.
From the numbers of factors responsible in bend or flexibility of the flex printed circuits, thickness plays the most essential role. While an approximate circuit thickness of 0.006'' is maintained in each layers of a flexible printed circuit, the areas subjugated to flexion are made less thicker.
Many a modern printed flex circuits are constituted by adhesive-less inner layers with conductors arranged in a staggered manner. Compared to their adhesive counterparts, adhesive-less layers are able to reduce the circuit thickness by .001-.002''. A staggered arrangement of conductors, in comparison to the 'on top' design, helps the circuitry design to withstand better twists and turns.
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