Solder paste manufacturer — during Solder Paste printing, there are several types of quality issues: insufficient solder paste, solder paste bridging, and overall printing misalignment. What factors cause these problems? Shenzhen JJY, the Solder Paste Manufacturer, explains:

Solder paste insufficient: It results in insufficient solder joints of components after soldering, leading to missing components, deviation, and tombstoning.

The key reasons are: basic equipment parameters such as squeegee pressure, angle, speed, and release speed are not set correctly; the circuit board fixture inside the printer is loose; solder paste is missing on the stencil or there are contaminants on the circuit board, or stencil thickness is uneven; solder paste was not replenished in time during printing; after printing, the board was accidentally knocked by human error; expired solder paste was reused, etc.

Solder paste bridging: It causes open circuits and component deviation after soldering.

The key reasons are: circuit board design flaws, and the gap between pads is too small; the stencil apertures are skewed, not cleaned thoroughly, and solder paste release is poor; solder paste has poor properties, with poor viscosity and slump; basic machine parameters such as squeegee pressure, angle, speed, and release speed are not set correctly; after printing, the board was accidentally squeezed by human error and stuck together.

Overall deviation during solder paste printing: It causes poor soldering across the entire board of components, such as insufficient solder, missing leads, deviation, etc.

The key reasons are: the circuit board positioning reference is unclear, or it is not aligned with the stencil reference; the mold support pins were not positioned in time; common faults in the printer's optical positioning system; missing solder paste deposits and stencil apertures inconsistent with the circuit board design.

Shenzhen JJY Industrial Technology Co., LTD Main business: production of solder (Solder Wire, solder paste, Solder Bar, solder sheet, tin foil, etc.), as well as LED-type solder paste, Leaded Solder Paste, leaded silver solder paste, stainless steel PCB-type solder paste, SMT Solder Paste, lead-free Flux paste, no-clean solder wire, lead-free solder wire, Leaded Solder Wire, lead-free and leaded solder strips wave soldering rods, solder wires for automatic soldering machines.