The PCB circuit board industry has always had strict quality requirements for the production process. Among them, redness of the PCB circuit board caused by solder mask screen printing is a common undesirable phenomenon. It not only affects the external aesthetics of the PCB, but also affects the circuit board. There are also quality risks in the performance. This article – pcb Equipment Network will lead you to have an in-depth understanding of the causes and solutions to the redness of the PCB board caused by solder mask screen printing on the PCB circuit board.
1. The reason why PCB circuit board solder mask screen printing causes redness on the board surface
1. The thickness of the solder mask layer is not up to standard or there are residual bubbles:
The solder mask layer refers to a layer of protective layer covered on the circuit board after printing with ink solder mask screen to prevent the circuit from being affected by factors such as the outdoor environment; when the thickness of the solder mask layer is not up to standard or there are residual bubbles, it is necessary to During this stage, oxidation reactions are prone to occur when encountering high temperature environments, resulting in redness on the board surface, resulting in poor PCB quality.
- The ink quality is not up to standard:
If the ink itself used for solder mask screen printing has quality problems, such as expired ink and increased ink viscosity, it may cause the protective effect of the solder mask layer to fail, or it may not completely cover the circuit, leaving gaps and other quality loopholes, ultimately leading to Undesirable phenomena such as redness on the board surface may cause unknown risks and impacts on its performance and quality.
3. Flux and solder mask ink do not match:
Poor quality of PCB printed circuit boards often occurs in the coordination of related or adjacent processes. For example, the flux and solder resist ink do not match or are incompatible, which may also lead to conflicts, property changes, etc., resulting in redness of the board surface.
2. Solving strategies for PCB circuit board solder mask screen printing causing redness on the board surface
1.PCB circuit board solder mask screen printing-pre-production specification optimization:
Solder mask ink selection, ink viscosity modulation, ink quality shelf life, flux and other related consumables standard management and operating standards, forming parameters and steps to avoid PCB defect risks caused by raw materials.
2.PCB circuit board solder mask screen printing-in-production process optimization:
The PCB circuit board screen printing machine continuously summarizes and debugs and forms standardized parameter configurations based on printing needs to ensure scientific and reasonable ratios, thereby ensuring sustained and stable production quality.
3.PCB circuit board solder mask screen printing-post-production quality inspection optimization:
Develop reasonable quality inspection process steps to ensure timely detection of problems to avoid expansion of losses and reduce the impact on production efficiency.
4.PCB circuit board solder mask screen printing-employee production training:
Improve employees’ ability to identify, diagnose, analyze and solve process quality problems, enhance professional skills and understanding of the principles of bad problems, conduct regular assessment and training, and formulate standard operating procedures so that employees can operate efficiently and accurately, and respond to and solve various problems in a timely manner. an emergency situation.
3. PCB circuit board solder mask screen printing causes the board surface to become red. What to do in summary
The problem of PCB circuit board solder mask screen printing board redness is a common problem in the production process, but it is not a complicated problem. It is often only small and in the initial stage, and it is easy to occur in unprofessional and standardized factories. To solve this problem, the focus needs to be formed Professional and standardized operating procedures, selecting appropriate PCB circuit board solder mask screen printing machine equipment and professional operators to avoid the occurrence of such low-level errors, which will affect the company’s quality and comprehensive benefits.
Post time: Mar-12-2024