Two-sided and single-sided PCBs have two and one layers, respectively. They are useful for different devices. Multilayer PCBs have three or more layers of conductive material that are buried under the core of the material.
You may be wondering about how PCB manufacturing companies produce such circuits. They are manufactured by laminating multiple layers under high pressure and temperature.
It is ensured that no trapped air remains between the layers and the conductive surfaces are encapsulated with resin and adhesives. These adhesive materials hold the different layers together.
Fusing and curing complete the manufacturing process and the variety of materials varies from Teflon to ceramic and synthetic-based glass.
The composite material and the core are the same, but the prepeg is not completely cured to be malleable compared to the core. The lamination process corrects the alternative layers.
The manufacturing process involves high pressures and temperatures, so the previous melting melts and joins the different layers.
A gradual cooling process results in a perfectly smooth and hard multi-layer melting plate. PCB manufacturing companies use a precise process to guarantee a zero production error.