PCB board proofing refers to the trial production of printed circuit boards before mass production. Many customers do not understand what work needs to be done. Let me explain in detail for you today: What work do you need to do when making PCB samples?
1. Contact the manufacturer
It is necessary to inform the manufacturer of the product parameters, process requirements and quantity, and upload the drawings.
2. Cutting
According to the requirements of the drawings and documents, on the boards that meet the requirements, cut into small pieces that meet the customer's requirements.
3. Drilling
According to the data, drill the required hole diameter on the corresponding position of the sheet material that meets the size requirements.
4. Immersion copper
A thin layer of copper is chemically deposited on the walls of the insulating holes.
5. Graphic transfer
Graphic transfer is the transfer of the image on the production film to the board.
6. Graphic plating
Electroplate a layer of copper, or gold, nickel and tin on the exposed copper skin of the circuit pattern or on the wall of the hole to reach the required thickness.
7. Withdraw the film
Use NaOH solution to remove the anti-plating coating layer, so that the non-circuit copper layer is exposed.
8. Etching
Etching is to use chemical reaction method to corrode the copper layer of non-circuit parts.
9. Green oil
Transfer the graphics of the green film to the board to protect the circuit and prevent tin on the circuit when soldering parts.
10. Characters
Characters are marked on the PCB board - a mark that is easy to identify.
11. HASL
Spray a layer of lead tin on the bare copper surface not covered with solder resist oil to protect the copper surface from oxidation and ensure good soldering performance.
12. Molding
Through die stamping or CNC cutting machine, the shape forming method required by customers is produced, such as organic cutting, beer board, hand pressing, and hand cutting.
Note: The accuracy of the digital gong board and the beer board is higher, followed by the hand gong, and the hand-cut board can only make some simple shapes.
13. Test
Through electronic 100% testing, detect open circuit, short circuit and other defects that affect the functionality of the circuit board that are not easy to be found visually.
14. Final inspection
Check the defects through 100% visual inspection of the panel appearance, and repair minor defects to avoid outflow of problematic and defective panels.
