What Role Do PCB Boards Play in Electronic Textiles?
PCB Boards Play in Electronic Textiles
The pcb board is the backbone of most modern electronic devices. From the smallest mobile phones to advanced heart rate monitors and rockets, these boards are what makes all the components work together. They allow for the transmission and storage of electrical signals, powering everything from tiny integrated circuits to microprocessors with thousands of pins. Historically, these components were connected with wires and soldered together. However, the technology used to create a pcb board has progressed so far that the copper connections now lie directly on an insulating substrate.
A Printed Circuit Board (PCB) is composed of multiple layers with distinct functions that are fixed to each other using heat and adhesive. Its base material is usually fiberglass, known by its designator FR4. This is the foundation that gives the PCB its rigidity and thickness. It also provides insulation and prevents the conductive pathways from damaging each other. The underlying layer is often coated with metal, usually copper, which acts as an effective conductor of electricity. It may have a single-sided copper coating or a double-sided one. A pcb board may have anywhere from two to 16 layers of copper alternating with substrate layers.
Those copper pathways are made through the use of vias and through-holes. These are drilled holes in the substrate that are then filled with copper to form a connection between different layers of the board. A pcb board can also have silk-screens that mark out the conductive paths and their locations. These silk-screens are useful in preventing mistakes during production.
What Role Do PCB Boards Play in Electronic Textiles?
To make a pcb board, the first step is to prepare the fiberglass substrate by applying a layer of epoxy resin to it. This helps the copper to adhere to it and creates a strong bond. Then, the copper is deposited on top of this layer in a pattern that corresponds with the desired design. A layer of protective solder mask is then applied over the copper to protect it from corrosion.
The resulting pcb board can now be cut into smaller pieces to fit into the device it is meant for. It is important that these pieces can be easily handled and can withstand the stresses of regular wear and tear, as well as washing and other cleaning methods. Achieving this has been a challenge, but advances in flexible circuit technology have made it possible to weave robust interconnects into textiles.
For example, a recent study by Chinese researchers has developed a fabric that can hold electronics and still stay flexible. It is made from a combination of pre-stretched elastic yarn and polyurethane-coated copper fibres that can be stretched for long periods of time before the fibres break off. This makes the fabric suitable for wearable electronic devices like mobile phone holders and MP3 players, but with the ability to resist damage caused by abrasions and stretching. The research focused on developing a process that is resource efficient, automated, and highly scalable in order to enable future mass production of these textile-based circuits.