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PCB circuit boards are widely used in China, and pollutants will be generated during the manufacturing process of printed circuit boards, including residues of flux and adhesives and other pollutants in the manufacturing process such as dust and debris. If the PCB board cannot effectively guarantee the clean surface, resistance and leakage will cause the PCB circuit board to fail, thereby affecting the service life of the product. Therefore, cleaning the PCB circuit board is an important step in the manufacturing process.
Semi-aqueous cleaning mainly uses organic solvents and deionized water, plus a certain amount of active agent, a cleaning agent composed of additives. This cleaning is between solvent cleaning and water cleaning. These cleaners are organic solvents, flammable solvents, high flash point, low toxicity, safe to use, but must be rinsed with water and then dried.
Water purification technology is the development direction of clean technology in the future. It is necessary to establish pure water source and discharge water treatment workshop. Using water as the cleaning medium, surfactants, additives, corrosion inhibitors and chelating agents are added to the water to form a series of water-based cleaning agents. Can remove water solvents and non-polar contaminants.
Used in the soldering process without clean flux or clean solder paste, after soldering directly into the next process for cleaning, no longer free cleaning technology is currently the most commonly used alternative technology, especially mobile communication products are basically one-time use Method to replace ODS. Solvent cleaning is mainly used for solvents to dissolve and remove contaminants. Solvent cleaning requires simple equipment due to its fast volatilization and strong solubility.
The above four cleaning technologies can achieve a certain cleaning effect, but how to clean the PCB board quickly and effectively? The application of ultrasonic cleaning machine can be solved. It uses ultra-high frequency to transform into kinetic energy in the liquid medium to produce cavitation effect, form countless tiny bubbles, and then hit the surface of the object, causing surface dirt to fall off, so as to achieve the effect of cleaning. Because it passes through the liquid, as long as the liquid can touch the surface, it can be cleaned in place, leaving no dead corners.
It can work on each surface of multiple objects at the same time. It is very effective and fast, and can be cleaned in about 15 minutes. One of the advantages of using ultrasonic cleaning is that it can effectively restore, improve the ability of pads and components, and reduce electromagnetic interference.
