Prepreg is an element of unprocessed FR4. The FR4 is utilized in the Absolute PCB industrialized process, where it performs the utility of required imprinted cores jointly. It can also help glue the copper foil with the imprinted substances together. Thus, the prepreg PCB can differ in thickness in agreement with the altitude of the imprinted boards. If we evaluate prepreg vs. core, the end is FR4 covered with copper on either side and made in a core industrial unit. But the prepreg is a type of virgin FR4 that finds itself into the structure of a PCB board.
The research process of prepreg involves:
- Strengthen with resin which can be moreover thermoplastic or thermoset.
- Deduction of surplus resin
- Research of curling with high and low-temperature settings
Relevance in the PCB Manufacturing Process
The everyday relevance of the prepreg PCB mechanized process lays in bonding the copper realms of a copper-plated shield with copper foils applied in multi-layer stiff type PCBs. Further, it uses in a flexible circuit or rigid-flex circuit board developed process too.
The multi-layered PCB of inflexible type employs prepreg in bonding the CCL or copper-coated cover with copper foil.
Composite PCBs categorize as Flex circuits with stiffener PCB and Rigid-flex board.
With stiffener PCB type in flex circuit, the PCB layer achieved on its own to multi-layer style. In this issue, the prepreg implementation lies in connecting the FPC with a stiffener.
Superior engineering experts use prepregs to minimize the heaviness of the part they are planning. The minor heaviness parts a consider necessary where the devices or products are hypothetical to act contrary to any flow or resistance. For Example, aerospace requires insubstantial components. Not many profitable products charge well in terms of cost-efficiency when they consider less.
Major industries where prepreg finds its relevance are construction, defense, Marine, Transportation, Infrastructure, power, and wind energy.
Importance of Prepreg
Prepreg is an essential part of the PCB mechanized process because:
- These are simple to relate to and trained to work. It does not need much mechanical expertise. Even a less-savvy person can become known with prepregs with regular use.
- As compared to the wet style layups, PCB prepreg material is significantly less messy.
- These are accessible in several types, such as hybrid, fiberglass, and Kevlar as well.
Function of Prepreg
It plays a vital role in the PCB expansion process. Its function is securing the copper foil to an imprinted core or fusing the two imprinted roots. The prepreg uses to begin protection inside conducting parts of a multi-layered PCB board.
It configures a receiving substrate on which the copper coils can be suitably fused. Technically speaking, it is an FRP strengthening fiberglass impregnated with resin. Therefore, it does a job of holding the layers mutually to accomplish a preferred thickness of the PCB board. It is primarily responsible for the correct binding of coatings and insulation and for reducing the overall weight.
Conclusion: The PCB layer is double-sided to multi-layer type in the rigid-flex board. This formation achieves by using prepreg to bond CCL with copper foil and bonding FPC with stiffener.