What are the common factors affecting the quality of solder paste printing in SMT processing?

inSMTIn processingSolder pasteThe quality of printing is also one of the factors that can directly affect the overall quality of the product, and inSMTMost of the soldering defects in surface mount technology (SMT) processing result from the quality issues of solder paste printing. In high-density and high-precision applicationsSMTThis is particularly evident in surface mount technology. Common solder paste printing defects mainly include insufficient solder, collapse, deviation, sharp edges, and uneven thickness. Below, JJY Solder Paste Manufacturer will briefly introduce some common factors that affect the quality of solder paste printing.

1. Steel mesh

Steel mesh has a direct impact on the quality of solder paste printing, especially as the precision of surface mount components is getting higher and higher nowadays.BGAThe ball spacing is getting smaller and smaller, and the requirements for the flatness and precision of the opening walls of the steel mesh are becoming more and more strict. The quality of the steel mesh will be directly reflected in the printing quality of the solder paste.

Ii. Solder paste

inSMTThe influence of solder paste quality on solder paste printing quality during processing mainly lies in aspects such as solder paste viscosity, particle uniformity, particle size and shape, and metal content in the solder paste. Solder paste with insufficient viscosity may not fully fill the openings of the steel mesh during printing. If the viscosity is too high, the solder paste may stick to the walls of the steel mesh holes but not completely fall off the mesh and land on the pads.

Iii.PCB

PCBThe flatness isSMTThere will also be a direct impact in the processing of solder paste printing, especially for larger sizesPCBIt is even more necessary to specially customize fixtures for support, thereby preventingPCBThe change in solder paste printing volume caused by deformation.

Iv. Printing Parameters

NowadaysSMTMost processing plants use fully automatic solder paste printers for solder paste printing. The parameter adjustment of the printer is also crucial for the quality of solder paste printing, such as printing speed, squeegee Angle, pressure, steel mesh andPCBSeparation speed, etc. .

Shenzhen JJY Industrial Technology Co., Ltd. mainly engages in the production and operation of:SMTSolder paste manufacturers of solder paste, syringe solder paste, lead-free solder wire, wave soldering bar, automatic soldering wire, etc.