The selection, tension testing, and cleaning methods of SMT stencils are crucial steps in surface mount technology (SMT) assembly, as they directly affect the effectiveness of solder paste printing and consequently impact the final soldering results. To prevent issues such as insufficient solder, bridging, or solder voids, SMT engineers need to rigorously manage stencil-related processes,…
In surface mount technology (SMT) assembly, there are various factors that can impact the final quality, such as the quality of surface mount components, the quality of PCB pads, solder paste, solder paste printing, placement accuracy of SMT machines, and the temperature profile of reflow soldering. Among these, an essential step in SMT assembly is…
Manual cleaning of oil-based ink after screen printing is essential for maintaining the quality of printed industrial products. However, in most screen printing companies, commonly used ink cleaning agents include gasoline, trichloroethylene, acetone, and benzene, also known as washout solutions. These solutions are widely used due to their fast drying rates and low cost, despite…
The significance of cleaning printed circuit boards (PCBs) lies in removing residual conductive particles, flux, dust, and other contaminants to achieve insulation performance. This helps prevent poor contact, avoid defects during continuity testing, and mitigate corrosion. Therefore, the evaluation of PCB cleaning effects is crucial as it directly impacts the quality of the PCB after…
I. Wave Soldering Principle Wave soldering is a process that utilizes the pumping function to create a special wave of molten solder on the surface of the soldering material. When electronic components are inserted into the solder wave, a point welding process is produced in the soldering area of the component. During the process, the…
Standard manufacturer reflow ovens require a major cleaning once a month to ensure product quality and stable equipment performance parameters. This involves removing detachable components such as condensers, fans, and filters for cleaning. For wave soldering, filters and chain claws need to be cleaned regularly to remove resin stains and high-temperature carbonization. This prevents resin…
During the PCB assembly process, solder paste and flux residue can form residual chemical substances, including organic acids and decomposable ions. Organic acids have corrosive effects, and residual ions on the solder pads may cause short-circuit faults. Moreover, these residues on the PCB are particularly dirty and do not meet the cleanliness requirements of customers.…
The process of water cleaning for PCBA (Printed Circuit Board Assembly) boards involves using water as the cleaning medium, with the addition of small amounts (typically 2% to 10%) of chemical substances such as surfactants and corrosion inhibitors. The cleaning process includes washing, followed by multiple rinses with deionized or purified water, and drying to…
The principle of PCBA board cleaning is essential for both surface mount technology (SMT) and through-hole technology (THT) assembly processes. Cleaning helps remove accumulated surface contaminants from the product during various manufacturing stages, thereby reducing the risk of surface contamination and enhancing product reliability. When cleaning PCBA, it is crucial to ensure compatibility between the…
With the continuous improvement of manufacturing levels in China, steel mesh cleaning machines have been increasingly recognized by enterprises. Using automated cleaning equipment can significantly reduce costs for businesses. Therefore, most companies choose SMT steel mesh cleaning machines instead of manual cleaning. The emergence of steel mesh cleaning machines effectively addresses this issue. So, what…
