Four layer board reference to Printed Circuit board with 4 layers of glass fiber, generally SDRAM use four layer board, although it will increase the cost of PCB, it can eliminate the interference of noise. , Which is using adhesive made of insulating material and copper foil through hot pressing. PCB substrate copper clad laminate reinforcement materials including glass fiber cloth and paper-based. Currently in the PCB industry, epoxy glass fiber cloth board is the most used. Or leather fiber cloth, the mechanical processing performance are are poor. From their structure It can be seen that they have brittleness and obvious delamination, high hardness, large wear on the machined tool. To improve the quality of processing, need to use carbide cutting Tools, large feed processing can guarantee the processing quality.
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