Two-sided board

Figure 5-9 Placing N-Fets Far Away on a Two-sided Board Can Cause Cross-conduction...

Wet/Dry - wet formed mats are hot-air dried to anhydrous condition and hot pressed between two smooth plates to form a smooth-two-sides board. 

CNC circuit board mill takes Gerber files and mills out two-sided boards. 

All of these limitations are avoided when the blind vias are drilled through a two-sided board used for the outerlayer and next innerlayer in a stack-up. These holes are drilled prior to lamination just as a thin two-sided plated through board. In this case, the process sequence for a bUnd via layer is identical to the sequence for a buried via layer. Such layers can be stack-driUed. 

Standard Plated through hole (PTH) is the current standard of the industry. The following purposes, objectives, and requirements apply to both multilayer and two-sided boards ... 

The preparation of a multilayer board involves laminating together in precise registration individual two-sided boards. Each plane of circuitry is separated by layers of prepreg prior to the lamination process. 

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