PCB News - Proofing process of multi-layer pcb circuit board

Proofing process of multi-layer PCB circuit board

With the rapid development of automotive electronics, communication electronics, industrial control, instrumentation, medical electronics, aerospace and other industries, the multilayer PCB circuit board industry also meets the needs of the market and consumers from time to time, and promotes the rapid increase in industry output value from time to time However, the competition in the multi-layer PCB circuit board industry is increasing. Many circuit board manufacturers do not hesitate to reduce prices and exaggerate consumption to attract a large number of customers. However, low-priced PCB boards must use low-priced materials, which affects the quality of production, short service life, and the product is prone to appearance damage, bumps and other quality problems.

The purpose of multi-layer PCB circuit board proofing is to determine the strength of consumer manufacturers, which can effectively reduce the defective rate of multi-layer PCB circuit boards, and to lay a solid foundation for future mass consumption. Let's look at the multi-layer PCB circuit board proofing process.

Multilayer PCB circuit board proofing process:

One, contact the circuit board manufacturer

First of all, you need to notify the manufacturer of the documents, process requests, and quantities. Regarding "What parameters are required for multi-layer PCB circuit board proofing?" Order, and follow up the progress of consumption.

Second, open material

Purpose: According to the request of the engineering materials MI, cut the large sheets that meet the request into small pieces of consumer boards to meet the small pieces of sheets requested by the customer.

Process: large sheet - cutting board according to MI request - curb board - beer fillet\grinding - board out

Three, drilling

Purpose: According to the engineering materials, drill the required hole diameter in the corresponding position on the sheet material that meets the requested size.

process: stacked plate pin - upper plate - drilling - lower plate - inspection\repair

Four, Shen copper

Purpose: Copper sinking is the application of chemical methods to deposit a thin layer of copper on the wall of the insulating hole.

process: rough grinding - hanging board - automatic copper immersion line - lower board - dip 1% dilute H2SO4 - thickened copper

Five, graphics transfer

Purpose: Graphic transfer is to transfer the image on the consumer film to the board.

Process: (blue oil process): grinding plate - printing the first side - drying - printing the second side - drying - exploding - shadowing - inspection; (dry film process): hemp board - pressing film - standing - right Position-Exposure-Standing-Development-Check

VI. Graphic plating

Purpose: Pattern electroplating is to electroplate a copper layer with the required thickness and a gold-nickel or tin layer with the required thickness on the exposed copper skin of the circuit pattern or the hole wall.

process: upper board - degreasing - second water washing - micro-etching - water washing - pickling - copper plating - water washing - pickling - tin plating - water washing - lower board

七, Remove the film

Purpose: Use NaOH solution to remove the anti-electroplating masking layer to expose the non-circuit copper layer.

Process: water film: insert rack - soak alkali - rinse - scrub - pass machine; dry film: release board - pass machine

8. Etching

Purpose: Etching is to use chemical reaction to corrode the copper layer of non-circuit parts.

Nine, green oil

Purpose: Green oil is to transfer the graphic of the green oil film to the board to maintain the circuit and prevent the tin on the circuit when welding parts.

process: grinding plate - printing photosensitive green oil - curium plate - exposure - developing; grinding plate - printing the first side - drying plate - printing the second side - drying plate

十, Character

Purpose: Characters are provided as a mark for easy identification.

Process: After the green oil finishes - cool and stand - adjust the screen - print characters - back

eleven, gold-plated fingers

1. Purpose: to plate a layer of nickel/gold with the required thickness on the plug finger to make it more hard and wear-resistant.

process: upper plate - degreasing - washing twice - micro-etching - washing twice - pickling - copper plating - washing - nickel plating - washing - gold plating

2, tin plate (a process in parallel)

Purpose: Tin spraying is to spray a layer of lead tin on the exposed copper surface that is not covered by solder mask to protect the copper surface from corrosion and oxidation to ensure good soldering performance.

process: micro-erosion - air drying - preheating - rosin coating - solder coating - hot air leveling - air cooling - washing and air drying

12. Forming

Purpose: Organic gongs, beer board, hand gongs, and hand-cutting can be produced by die stamping or CNC gong machine.

Clarification: The accuracy of the data gong machine board and the beer board is higher, and the hand gong is second, and the minimum hand-cutting board can only be made with some simple shapes.

13. Test

Purpose: After electronic 100% testing, to detect defects that affect functionality, such as open circuits and short circuits that are not easy to find visually.

Process: upper mold - release board - test - pass - FQC visual inspection - unqualified - repair - return test - OK - REJ - scrap

Fourteen, final inspection

Purpose: After 100% visual inspection of board appearance defects, and stop repairing minor defects to prevent problems and defective boards from flowing out.

Detailed work flow: incoming materials - view materials - visual inspection - qualified - FQA spot check - qualified - packaging - unqualified - disposal - inspection OK!

Due to the high technical content of the design, processing and manufacturing of the multi-layer PCB circuit board manufacturers. Therefore, as long as every detail of PCB proofing and manufacturing is done accurately and rigorously, high-quality PCB products can be obtained. To win the love of more customers and win a larger market.