Why does the steel mesh often get clogged during solder paste printing?

While we are conductingSolder pasteWhen printing, sometimes the printing steel screen gets clogged. Why is that? Today, JJY solder Paste Manufacturer will analyze it together with everyone:

1The steel mesh was not cleaned thoroughly, with dust or debris. Once it comes into contact with solder paste, they will "clump together", causing the steel mesh to get clogged.

2The opening design of the steel mesh is unreasonable. If the mesh is too small and there are too many burrs, it will cause the solder paste to be unable to be downloaded, thus resulting in mesh blockage.0.4pitchThe openings of the steel mesh are relatively small. If there are many burrs at the edge of the steel mesh, resulting in poor tin plating, it will also get clogged.

3The solder paste blocking of the steel mesh is also related to the working temperature. The working environment can be taken into consideration.

4The composition of solder paste will constantly change during use,The most obvious one is the change in viscosity.When the temperature is relatively high,Flux evaporates relatively quickly,When the humidity is high,The water absorption of solder paste will be more prominent again,All of these will cause changes in the viscosity of the solder paste,This affects its surface tension, and the change in tension will lead to the change in the situation of net disengagement.

5The viscosity of the selected solder paste, the particle size of the tin powder, the material of the scraper, the pressure during operation, the pressure of the pressure plate and the time of plate removal, etc., can also cause the steel mesh to be clogged.

As a 15-year-old veteran solder paste manufacturer, JJY has been dedicated to the research and development and production of solder paste for many years. The quality of the solder paste is stable, without solder bonding, false soldering or establishing a reputation. No residue, Wuxi beads, bright and full solder joints, firm solder joints, and excellent electrical conductivity. If you have any needs, please feel free to contact us.