RCY ELECTRONIC : Production process of halogen free PCB board
As we all know, PCB has halogen and halogen free two types, there are halogen PCB board production flow we introduced before.
However, today let’s talk about the halogen free PCB board and its manufacturing process flow
Lamination parameters may vary from company to plate. For example, the ShengYi raw material of as the multi-layer board mentioned before
In order to ensure the sufficient flow of the resin and good bonding force, we must require the lower heating rate of the sheet (1.0-1.5 ° C / min) and the multi-stage.
In addition, It also require the Multi-stage Pressure matching and in the high temperature phase
a longer time 180 ° C for more than 50 minutes during manufacturing of halogen free PCB board
The pressed plate was used to detect the bonding force between the copper foil and the substrate being 1.ON/mm
2 Drilling processability
Drilling conditions are an important parameter that directly affects the quality of the hole wall
of the PCB during processing. What’s more, the halogen-free copper-clad laminate uses P, N series functional groups
to increase the molecular weight and enhance the rigidity of the molecular bonds
thereby enhancing the rigidity of the material
At the same time, the Tg point of the halogen-free material is generally higher than that of the ordinary copper-clad board,
so the ordinary The drilling parameters of the FR-4 are drilled, and the effect is generally not ideal.
When drilling a halogen-free board, it is necessary to make some adjustments under normal drilling conditions.
3 Alkali Resistance
Generally, the anti-alkaline of the halogen-free PCB material is worse than the ordinary FR-4 pcb material
Therefore, in the etching process and in the reflow process after soldering
special attention should be paid to the fact that the soaking time in the alkaline film-removing liquid cannot be too long,
in case of white spots on the substrate
4 Halogen-Free Soldering production
At present, there are many kinds of halogen-free solder resist inks appeared in the market
and its performance is not much different from that of ordinary liquid photosensitive inks
Halogen-free PCB boards have the requirements of low-water absorption and environmental protection,
and can meet the quality requirements of PCB boards in other performances
Therefore, the demand for halogen-free PCB boards is getting larger and larger.