PCB News - Common quality requirements for pcb proofing processing

Common quality requirements for PCB proofing processing

With the development of science and technology, the circuit board industry has become more and more obvious. The electronics industry is currently the most thoroughly globalized and market-oriented field. The pursuit of high-tech and low-cost is an inevitable trend in the development of the electronics industry. High PCB proofing product quality and low cost advantages, the quality of PCB proofing processing in Shenzhen is the quality level of the product. It is a collection of quality, reputation, responsibility and culture, which is our consistent pursuit. When it comes to quality issues, Shenzhen Circuit Board Factory discusses the most. Whether it is a double-sided circuit board or a 4-layer PCB circuit board or other high-precision multilayer PCB circuit boards, the quality problems are related to customer experience. It is said that the customer is God, and the customer is very concerned about the quality of PCB. So, what are the common quality requirements?

Double-sided module binding board

Whether customers are satisfied with the quality of PCB processed products and whether the products meet the needs of customers is the only criterion to measure the quality of the products. The printed circuit board is a special electronic accessory product, one customer, one model, one board, processed according to the customer's special documents, and there is no universality. When the double-sided PCB circuit board is rejected by the customer who ordered, our double-sided circuit board can only be scrapped and will not be accepted by other customers. However, although various printed circuit boards have different circuit patterns and different structural sizes, they also have commonalities. Commonality is its basic requirement. The quality requirements of circuit board factories usually have the following aspects:

(1) Appearance requirements: Shenzhen PCB proofing processing usually requires more stringent appearance. The appearance requires no pollution, inclusions, fingerprints and oxidation on the surface to prevent affecting solderability and insulation. The color of the solder mask is consistent, and there is no peeling, omission, offset, or oil leakage to prevent the welding from being affected. The edge of the board is smooth, without bumps or burrs, so as not to affect the assembly size and insulation. The wire is uniform, without over-corrosion, chipping, and residual copper, so as not to affect the electrical performance. The marking symbols are clear and unambiguous to read, so as not to affect assembly and maintenance. There are no scratches on the surface to avoid affecting the welding assembly and electrical performance. There is no blistering or delamination between conductors or insulating layers, especially multilayer circuit boards, to avoid affecting mechanical and electrical properties.

(2) Electrical performance requirements: It is very important to have a suitable electrical clearance between the wires of the multilayer circuit board. The setting of the appropriate line spacing can prevent flashing between the relevant conductors in the work of PCB processing products. And breakdown, and can successfully pass the review of relevant product safety standards. In the industrial standards and safety standards of circuit board PCB products, different working voltages, different applications and other factors have different regulations on the electrical clearance and creepage distance between conductors.

(3) Mechanical performance requirements: Shenzhen circuit boards require that the copper clad laminates must be baked before cutting to ensure that the water vapor volatile resin in the board is completely cured; when cutting, strictly follow the latitude and longitude directions in the opening instructions; lamination typesetting When setting, open according to the latitude and longitude direction of the PCB processing plate. When typesetting, first distinguish the latitude and latitude directions, and then typeset according to the differentiated latitude and latitude directions to ensure that the latitude and latitude directions are consistent. Completely release, the resin is completely cured; when the characters of the circuit board are baked at high temperature, the shelf needs to be adjusted according to the size of the board. When inserting the shelf, the board is not allowed to be bent or twisted. If the size is different, a separate shelf needs to be inserted for baking.

(4) Environmental resistance and other performance requirements:

Multilayer circuit boards have environmental resistance, mildew resistance, humidity resistance, steam cooking resistance, temperature shock resistance and other properties. The formation of PCB allegro product quality runs through the whole process of product formation, and the product quality of PCB version is related to the whole manufacturing process. Every circuit board factory should pay special attention to quality issues. Quality is produced, not tested. Think of yourself as the consumer of the previous process and the next process as your customer. Behind each circuit board is a group of quality assurance personnel who are silently conducting quality inspections. A complete quality control system is required by every circuit board processing plant.