What are the common factors that affect the quality of solder paste printing?

Everyone knows that when electronic products are processed in surface mount technology (SMT) factories,smtUsed in productionSolder pasteThe quality is of great significance because solder paste can directly affect the quality of the entire board. If a surface mount technology (SMT) processing factory wants to produce good products, it must pay attention to every processing detail. Most soldering defects come from the quality problems of solder paste printing. Common solder paste printing defects mainly include insufficient solder, collapse, deviation, sharp edges, and uneven thickness, etc. Below, Shenzhen JJY Solder Paste Manufacturer will briefly introduce some common factors that affect the quality of solder paste printing to you:

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 is mainly reflected 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. On the other hand, 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. .

JJY solder Paste Manufacturer mainly engages in lead-free solder paste.SMTSurface mount solder pasteLEDResearch, development, production and supply of solder pastes, lead-free solder wires, wave soldering rods and other solder solders. For more knowledge about electronic soldering, please contact us. Welcome to interact with us.