How is the 6-layer PCB board made

How is the 6-layer PCB board made

The PCB layer refers to the copper layer, while the PCB layer number refers to the number of copper layers. The 6 -layer printing circuit board, as the name suggests, refers to the 6 -layer copper circuit layer on the circuit board. The component layout of the 6 -layer printing circuit board can reduce the cost of manufacturing. Under normal circumstances, consumer electronics products and cost -effective products will apply 6 -layer PCB.

How is the 6 -layer PCB manufactured? The following content reveals the manufacturing of 6 layers of PCB.

6-layer printed circuit board’s basic structure

The 6 -layer PCB is composed of two PCB cores with two PCB layers and two layers on both sides. It belongs to multi -layer PCB.

A PCB core consists of a base material layer and two copper layers. It is cut by double -sided copper plate. Between the copper layer and the PCB core are pre -immersed. The pre -immersion and PCB substrate are the same material, but the pre -immersion is semi -solidified, and the substrate is solidified. A external PCB layer is formed by pre -immersion and copper foil.

The 6th layer includes the signal layer, ground (GND) layer and power layer. The top layer (1st layer) and the bottom layer (layer 6) must be the signal layer. The four internal PCB layers include 2 signal layers, 1 ground floor, 1 power layer, or 1 signal layer, 2 ground floor, 1 power layer. So there are 4 6 -layer PCB stacks.How is the 6-layer PCB board made

6-layer PCB layer 1: Signal 1-GND2-Signal 3-Signal 4-Power Supply 5-Signal 6

How is the 6-layer PCB board made

6-layer PCB superposition two: signal 1-signal 2-GND3-Power 4-Signal 5-Signal 6

How is the 6-layer PCB board made

6-layer PCB superposition 3: Signal 1-GND2-Signal 3-GND4-Power Supply 5-Signal 6

How is the 6-layer PCB board made

6-layer PCB superposition 4: Signal 1-GND2-Signal 3-Power 4-GND5-Signal 6

6-layer PCB manufacturing

The 6 -layer PCB is manufactured by pressing the PCB layer on the upper layer of the PCB core. Once the circuit is etched on the PCB core, after the third and fourth layers are completed, the second and fifth layers are pressed at the core under high temperature and high voltage. Then erode carved circuit on the second and fifth layers. The top and bottom layers are also posted on the 4th layer and etched circuit. Specifies on the top and bottom layers to surface treatment on PCB pads.

You may ask, how does the circuit on the copper layer erode on the 6 -layer PCB?

The two circuit etching methods can be the PCB layer. Which method to choose depends on whether the layer needs to drill HDI through the holes. These two circuit etching methods are.

The front etching -etching solution is the pcb layer of the PCB layer that does not need to drill HDI through the HDI pores. Process-UV-based on the circuit pattern on a copper layer with ultraviolet sensitive membrane printed. The film on the copper on the shadow of the circuit pattern is still liquid, and the thin film on the copper that is not needed hard. The liquid film was then washed off. Then on the exposed copper tin plating as a protective layer. Next, the dry membrane was peeled off. Finally, the unnecessary copper was carved out of alkaline liquid, leaving only the copper in the circuit pattern.

Negative plane etching-etching solution is acid, which is used to require the PCB layer that requires the HDI hole. The process is that the ultraviolet light projected the shadow of the circuit pattern on the copper layer with another kind of ultraviolet sensitive film printed. The film on the copper film under the shadow of the circuit has hardened, and the film on the copper that is not needed is still liquid. The liquid film was then washed off. The unnecessary copper was corroded with acid. Finally, the dry membrane was peeled off, leaving only the copper in the circuit pattern.

For the core part of the PCB, both circuit etching methods can be used; for top and bottom layers, only positive plane etching can be used.

If the PCB hole of the 6 -layer PCB has only PTH holes, the PCB board is mechanically drilled on the PCB board after layer pressure, and then plated copper on the PTH hole for the circuit layer connection.

For the 6 -layer HDI PCB, the top layer, bottom, second and fifth layer perform laser drilling and plating before layer pressure. The core of the PCB is to electroplating through laser drilling and plating before layer pressure.

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