The production process of PC board is extrusion molding, and the main equipment required is an extruder.Because the processing of PC resin is more difficult, it requires higher production equipment.Most of the domestic equipment for the production of PC boards is imported, most of which come from Italy,Germany and Japan.Most of the resins used are imported from GE in the United States and Baver in Germany.Before extruding, the material should be strictly dried so that its water content is below 0.02% (mass fraction). The extrusion equipment should be equipped with a vacuum drying hopper, sometimes several in series.The temperature of the body of the extruder should be controlled at 230-350°C, gradually increasing from back to front.The machine head used is a flat extrusion slit machine head. After extrusion, it is calendered and cooled. In recent years,

In order to meet the requirements of PC board anti-ultraviolet performance,A thin layer containing anti-ultraviolet (UV) additives is often applied to the surface of the PC board.This requires the use of a two-layer co-extrusion process,That is,the surface layer contains UV assistants and the bottom layer does not contain UV assistants. The two layers are compounded in the nose,It becomes one after extrusion. This kind of head design is more complicated.Some companies haveadopted some new technologies, and Bayer has adopted technologies such as specially designed melt pumps and confluencers in the coextrusion system.In addition, in some occasions, there are dew drops on the PC board.
So there should be an anti-dew coating on the other side.Some PC boards need to have anti-ultraviolet layers on both sides,This kind of PC board production process is more complicated.