PCB Depth control routing technology is the stepstair or groove shaped by partial routing in printed circuit boards(PCBs) manufaturing.It have great advantages in PCB assembly as the special shape of depth routing.
There are two main methods of manufacture stepstair .
Depth control routing:
Filling and embedding cushion material.
We main introduce the control depth of stepstair and manufacture capability for depth control routing. And learn the control of adhesive,the pattern of stepstair rim and the hole’s reliability,size capability of stepstair.
The study for Capability
Mechanical milling:
For the stepstair PCB of mechanical milling,the precision can be +/-4mil is very high as equipment factor.As the stepstair slot is always in the depth of 0.2-0.4mm at some layers, it’s impossible to keep milling to particular layer, there have depth tolerance as the control principle and mechanical precision. At present,main use two ways to control the depth of milling in stepstair milling process.
Filling and embedding cushion material.
Filling cushion material to make depth routing for that stepstair is in middle of PCB center, main control the resin flow at side wall,slot bottom and notch,ensure resin flow stability at bottom, resin flow homogeneity at side wall and no resin flow at notch.
For this kind of stepstair milling PCB, all use FR4 materials and CORE+CORE to lamination. The prepreg thickness 20mil, the chip thickness 20mil. There are different size of stepstair,minimum 20x20mm,maximum 200x200mm,the depth milling is 1.0mm.
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