PCB Technical - Ultra-precision six-layer PCB and preparation

The ultra-precision six-layer PCB circuit board leads are refined and the through-holes are miniaturized, which improves the control level of the processing equipment and technology of the circuit board processing plant. At the same time, it is also the overall management ability of the precision six-layer PCB circuit board factory and the personal ability of the employees. The test. The line width/line spacing production capacity of 6/6mil is not too difficult within the current equipment, materials, and process control level, and most PCB manufacturers can produce it. However, it is a big leap to upgrade from 6/6mil to 5/5mil, which makes many small and medium-sized manufacturers amazed. It seems simple, in fact, this requires circuit board processing manufacturers to have strong technical research and development capabilities and financial strength. Subject to the performance parameters of the exposure machine, the processing ability of the etching line, and the control ability of the entire process, to achieve a 5/5 mil line and maintain a high yield rate requires the strong overall strength of the factory to support. The same is true for the production of finished apertures of 0.3mm and below (holes below 0.3mm cannot be drilled by machine, generally laser drilling).

The importance of PCB as a carrier of electronic components

PCB as the carrier of all electronic components, its reliability is very important. A tiny strand of hair or a tiny particle of dust may cause the entire PCB board to be scrapped, or lead to potential failures. So how is the quality guaranteed? Usually everyone thinks that quality should be manufactured, but it is not. If a PCB factory from the beginning of design, including the layout of the factory, the determination of the process flow, the selection of production equipment, the allocation of manpower, the effective evaluation of raw materials, the determination of the management system, etc., can start from the perspective of effective quality control, To make corresponding adjustments, control, and prevention for common quality problems, and fully consider improving production efficiency, then the future quality control and production capabilities of this factory will have a good foundation and guarantee.

What needs to be prepared in advance before the PCB board proofing

Generally, before doing experiments or mass production of PCB boards, they will do PCB board proofing for testing. There are many forms of PCB files. In order to meet the different needs of the market, these different forms of files can generally be opened by PCB board manufacturers. So, what materials need to be prepared before PCB proofing? Follow to find out!

Generally, you need to provide PCB or GERBER files to the PCB manufacturer. The provided files need to include some board manufacturing instructions, such as: the number of board layers, required materials, pad technology, ink color and other specific production requirements. The specific instructions are as follows:

1. Material: It is necessary to explain what material is needed to produce PCB, generally FR4 is commonly used, and the main material is epoxy resin peeled fiber cloth board.

2. Board layer: After the PCB board is proofed, the number of layers has an impact on the price, so it is necessary to indicate how many layers are made.

3. Solder mask color: the normal color is green, other colors need to be noted.

4. Screen printing color: the color of the font and border of the screen printing on the PCB board, the default selection is generally white.

5. Copper thickness: Generally, the copper thickness is scientifically calculated according to the current of the circuit. Generally, the thicker the better, but the cost will be higher, so a reasonable balance is required

Whether the via is covered with solder mask: Over solder mask is to insulate the via, otherwise it is to make the via uninsulated.

6. Surface coating: Before proofing the PCB board it is necessary to indicate whether the surface coating is tin sprayed or gold-plated.

7. Quantity: The quantity of PCBs must be clearly stated.