SMT solder paste thickness standard: with the complexity of electronic products, solder paste printing is becoming more and more refined. At present, compared with other SMT processes, solder paste printing process has more variables, some of which are beyond human control. Solder paste printing process has many potential instabilities. According to the latest research results, the printing process has a variability of more than 60%. The reason for this great variability is that the printing process contains a large number of uncertain process parameters, including the type of solder paste, formula, environmental conditions, the type and thickness of steel mesh, the width thickness ratio and area ratio of openings, the types of printing machines, scrapers, printing head technology, printing speed, etc.

Speaking of the thickness of printing steel mesh, SMT solder paste thickness standard is most related to this factor. For example, we often use 0.12mm steel mesh solder paste thickness. Usually, when we open the steel mesh thickness of 0.12mm to print, we think that the thickness of our solder paste is 0.12mm, but it is actually wrong, because according to the printing process, there is a certain gap between our PCB and the steel mesh directly. In the process of printing solder paste, the solder paste will fill the gap, and then take off the mesh. Then when we test this thickness, It can be imagined whether the solder paste is thicker than the steel mesh. How much is the thickness standard of SMT solder paste? We need to constantly define this in our study, because there is no standard definition of SMT solder paste thickness standard in the world, only different judgment standards, but one thing remains the same, that is, good welding effect is the best amount of solder paste. Generally, 0.12mm thick steel mesh, and the thickness of solder paste is usually between 0.1-0.16mm, which is more suitable. Beyond this range, there will be some solder paste welding defects more or less.