1 layer pressure

　　The layer pressure parameters may be different because the plates of different companies may be different. Take the Shengyi substrate and PP as a multi-layer board mentioned above, in order to ensure the full flow of the resin, make the combination of good combination, and require lower the heating rate (1.0-1.5 ° C / min) and multi-paragraph The pressure is coordinated, and the time is required for a long time during the high temperature stage, and 180 ° C is maintained for more than 50 minutes. Here are the recommended sets of boarding program settings and the actual heating of the plate. The binding force of the pressed plate to detect its copper foil and the substrate is 1.ON / MM. The plates after the picture have no layering and bubbles after six thermal shocks.

　　2 drilling processing

　　Drilling conditions are an important parameter that directly affects the quality of the hole wall of PCB during processing. Because the halogen -free copper plate is used to increase the molecular weight by using the P and N series of official energy groups, and the rigidity of the molecular bond is enhanced, the rigidity of the material is also enhanced. At the same time, the TG points of the halogen -free materials are generally higher than that of ordinary copper plates. Therefore FR-4's drilling parameters are drilled, and the effect is generally not ideal. When drilling without halogen, it is necessary to make some adjustments under normal drilling conditions.

　　3

　　Generally, halogen-free plates are worse than ordinary FR-4, so in the etching process and after welding, you should pay special attention to the soaking time in the alkaline retirement fluid. To prevent the occurrence of substrate white spots.

　　4 Ladder -free welding production

　　At present, there are also many kinds of halogen -free and welded inks launched on the world. The difference in performance and ordinary liquid light -sensitive ink is not very different from ordinary inks.

　　Due to the low water absorption rate and the requirements of environmental protection, the halogen -free PCB board can also meet the quality requirements of the PCB board in other properties. Therefore, the demand for halogen -free PCB boards has become increasing.