Printed circuit boards (PCB) are of two types according to their substrates – rigid printed circuit boards and versatile printed circuit boards.
The PCBs of yesterday were mostly rigid. In this modern era of mobile technology where most people are inching toward miniaturization, a requirement was felt for circuit boards that were lightweight, flexible, thin, small, along with high wiring density. Flexible printed circuit boards were invented to respond to these requirements. These are Flexible printed circuit boards that can be three-dimensionally wired and might be reshaped to fit available space.
A flexible type of PCB is comprised of a versatile board, wirings provided on the flexible board, and connection pads being conductive through wirings, which are provided around the edge of the flexible board. A copper foil is laminated into a resin substrate the layers and joined with adhesive or with the use of heat and pressure into an important board. There may be a couple of conductive layer for producing circuitry for both sides. There are insulating layers, adhesive layers, and encapsulating layers involving the conductive layers to make certain sufficient insulation. The plastic substrate of flexible printed circuit boards is actually created of polyimide or similar thermoplastic material, such as polyetherimide.
The substrate will then be coated by having an adhesive and contains a cable with a plurality of embedded electrically conductive lines. Apertures can be formed at one of the insulation layers for electrical link to other electronic components. Electronic devices are then connected to one another. In general, the front and rear surfaces seem to be engrossed in insulating layers to prevent a wiring pattern from being conducted to many other wiring pattern formed on Flexible printed circuit boards.
* Take thin polyimide sheets which are copper plated on both sides. Cut the sheet in the required size. Be sure that the copper is just not smudged as well as the edges of your sheet are certainly not uneven, which could harm the printer later.
* Require a solid ink printer that prints in melted wax. Wax forms a layer on the copper that protects it later while etching.
Use Computer Aided Design (CAD) software to draw in a diagram of your respective circuit.
* Utilize the printer to print this design on the polyimide sheet. The printed areas will come up as copper traces. Use dark, easily distinguishable colors, for example black or magenta.
* Soak the printed polyimide sheet in ferric chloride. We are now at the stage called etching, wherein ferric chloride can be a copper etchant. It takes as much as around 30 minutes to the dexbpky07 traces to dissolve and also the polyimide to show up.
* The circuit is now ready for mounting. You are able to cut it into smaller circuits as needed or apply it as it is. Holes are drilled with laser to mount electronic components. The Flexible Circuits is already prepared to solder.