Solder paste printing is incredibly vital for PCBA, which immediately has an effect on the general welding effect of PCBA. Inside the procedure of PCBA processing, how to do solder paste printing perfectly happens to be a dilemma that manufacturing supervisors need to contemplate. The outcome of solder paste printing is composed of steel mesh, solder paste, printing system and detection system www.smt-dip.com )Supply you with a particular assessment.

1?¡é Metal mesh

The opening of steel mesh should be appropriately enlarged or lessened based on the format of digital parts on PCBA board, so as to ascertain the quantity of tin within the solder pad, in order to accomplish the most beneficial solder influence and steer clear of the phenomenon of continual tin and absence of tin, which requires rigorous analysis by approach engineers. On top of that, the fabric of steel mesh is additionally far more vital, which affects the stress of steel mesh and the company life of recurring use.

In addition, the cleansing and storage natural environment right before feeding is especially important. Right before every on the web procedure, it is actually essential to hold out demanding cleansing, and verify whether the by means of hole is blocked and tin slag exists. Some PCBA suppliers counsel getting the metal mesh tensiometer and conducting the stress exam with the steel mesh prior to each feeding.

2?¡é Solder paste

The solder paste should pick the middle and high-grade models, these kinds of as Qianzhu, weiweituo, etcetera., which is made up of energetic elements such as gold or silver. The solder paste ought to be strictly stored in a very fridge of two to 10 degrees. The related data should be designed for every storage and shipping and delivery. The restoration of solder paste ought to be strictly controlled inside the scope of IPC typical, along with the solder paste mixing course of action must be strictly carried out in advance of heading on line.

3?¡é Solder paste printing

At the moment, manufacturers are applying computerized solder paste printing equipment, the machines can regulate the printing force and pace parameters, and has specified automatic cleaning purpose. The operator only needs to set the parameters strictly in accordance with the laws.

While in the process of mass output, it truly is specially essential to detect the blocking and deflection of the metal mesh, particularly when some defects detected by SPI soon after printing are going up, it really is needed to halt the equipment to check the operation of your metal mesh itself.

4?¡é SPI printing result detection

After the solder paste printing equipment, it is actually incredibly essential to configure SPI solder paste detector. It may efficiently detect a lot of flaws these types of as absence of tin, steady tin, gap, wire drawing, offset etc. In order to maximise the overall welding ppm value.

Administration of solder paste printing effect by itself isn't a mystery, it necessitates administrators to diligently apply each management usually means in PCBA processing process. A closed-loop system is developed to detect and detect defects.