The process flow and reliability design of PCB manufacturing are introduced

According to the predetermined design, the conductive pattern formed by the PCB board, pcb stackup calculator printed components, or a combination of the two is called the PCB board. The following describes the manufacturing process of PCB board.

Single-sided hard plate: Single side copper plate punching (brush, dry) drill or punch the silk screen anticorrosive pattern or repair the board anticorrosive pattern with dry film curing, dry brush cleaning, dry silk screen resistance welding pattern (commonly used green oil), UV curing silk screen character marking pattern, UV curing silk screen preheating, punching technology forming electrical opening, short circuit test cleaning, short circuit test, cleaning, intervention coating, anti-oxidation (drying) ) or tin mist hot air finishing flat inspection packaging finished products.

PCB board

Double-sided rigid PCB: CNC drilling detection, 1 oz vs 2 oz deburring brush plating (through hole metallization)(thin copper plate electroplating -RRB detection brush cleaning screen negative circuit pattern, curing (nickel corrosion) detection, negative circuit pattern detection, curing (nickel/gold), negative circuit pattern detection, screen printing negative circuit pattern detection, negative circuit pattern detection, negative circuit pattern detection, screen printing negative circuit pattern detection, negative circuit pattern detection, curing (nickel/gold), Tinning line pattern, tinning printing materials (except tin)(sensitive dry or wet film, exposure, development, heat curing, commonly used photothermal curing green oil), often used for cleaning and brush wire printing resistance welding pattern hot curing green oil (photoresist nickel/gold, hot curing common photoperiodic hot curing green oil) cleaning, drying screen printing feature pattern, Curing (tinning or organic welding) film shape treatment cleaning, drying flux inspection, packaging plant.

Multi-layer plate through hole metallization process: wire drawing, drilling, exposure light resistant dry film or photoresist, photoetching, inner roughing, inner roughing of deoxygenated layer (outer single-sided copper-clad plate, circuit manufacturing of B-grade adhesive sheet, inspection of plate adhesive sheet, drilling positioning hole). , (hot air leveling or organic solder resistance). The process of metallizing multilayer laminates through holes is realized by brushing the positioning holes. Drilling positioning holes, CNC drilling pretreatment and electroless plating of the whole plate, exposing and developing the bottom plate with photoresist plating dry film or coating photoresist plating agent, controlling and checking the number of positioning holes of the thin copper coating of the whole plate. The light resistance of full plate electroless copper plating and thin copper plating is controlled by the number of holes. Electroplating dry film development or electroplating light exposure surface, repair linear electroplating tin-lead alloy or nickel u 002f gold removal etching Check screen printing resistance welding pattern or photosensitive welding pattern printing characteristics diagram (hot air) or organic welding film)u002FNC cleaning shape cleaning,

PCB board

Multilayer PCB board technology is developed on the basis of double-sided metallization technology. According to experts from the China Epoxy Resin Industry Association, in addition to the double-sided process, the process has several unique contents: metal hole connection, drilling and decontamination, positioning system, layering and special materials. Our commonly used computer card is mainly an epoxy glass substrate for double-sided PCB board, one side is a plug-in, the other side is a welded surface component foot. We can see that the solder joints are very regular. We call it discrete welding surface solder joint.

Why other copper wires are not tinned. Because in addition to the welding pad and other components, other components have anti-wave welding resistance film on the surface. The surface solder resistance film is mostly green, and a few use yellow, black, and blue, so the solder resistance oil is often called green oil in the PCB industry. Its function is to prevent bridge during wave crest welding, improve welding quality and save solder. It is also the permanent protective layer of PCB, which can be moisture-proof, anti-corrosion, anti-mold and anti-mechanical scratches. From the appearance, the surface is smooth and bright green solder resistance film, which is the green oil of the plate heat curing. Not only good appearance, but also high solder joint accuracy.

PCB board drilling detection

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