SMD components come in a variety of shapes, including rectangular sheets, cylindrical rows, or special shapes, with soldering ends or pins manufactured in the same plane. They are suitable for surface mounter attachment of electronic components. Reflow soldering involves pre-distributing solder paste onto PCB circuits, which is then re-melted to complete the mechanical and electrical connection between the surface mount component terminals or pins and the printed circuit board pads.
SMT and SMD use a no-clean process in surface mount technology. The wastewater discharged after product cleaning during the production process can cause pollution of water quality, land, and animals and plants. Additionally, the use of organic solvents rich in chlorofluorohydrogen (CFC & HCFC) for cleaning can also pollute and damage the air and atmosphere. The residual cleaning agent on the machine board can cause corrosion, which seriously affects the product quality. However, using a no-clean process can reduce cleaning process operation and machine maintenance costs and minimize damage caused by the assembly board (PCBA) during movement and cleaning. It’s important to note that there are still some components that cannot be cleaned.
The amount of flux residue has been carefully controlled in order to meet product appearance requirements and eliminate the need for visual inspection of cleaning conditions. Continuous improvement of residual flux has enhanced its electrical function, preventing potential product damage from leakage current. The no-clean process has successfully undergone numerous international safety inspections, validating the stability and non-corrosive nature of the chemical substances in the flux of the SMT placement machine.
This process is also referred to as a product structure table or product structure tree, and in some industries, it may be known as a “recipe” or “element table”. In MRP II and ERP systems, the term “material” encompasses all products, semi-finished products, work-in-process, raw materials, accessories, cooperative parts, consumables, and other production-related materials.
