PCBA stencil play the irreplaceable role,efficient and precise electronic welding guarantee

During the process of SMT.The main function of the PCBA stencil is to print precisely solder paste on the PCB solder pad, providing a foundation for subsequent component SMT and reflow soldering. A good quanlity stencil can significantly improve solder quanlity, decreasing defective rate.

The core role of Stencil

The Stencil is usually made of steel material, through laser cutting or chemistry etching process to pen holes at the special place.  

Soder paste cover solder pad average through these opening holes, this can insure to make reliable electronic connection during components welding.

The thinckness of the stencil, the size of holes and shape will derectly influence the deposition amount, and influence the effect of welding.

So PCBA Stencil is critical for high-quality solder paste application in SMT

PCBA Stencil types and selections

the main stencil have 3 types

1.Laser stencil   high precision, applicable to high precise PCB,

the edge of the hole is smooth, reduce solder soder paste residue

2.Chemical etching stencil: low cost, applicable to normal PCB, but the precision is not good as laser stencil.

3. Electroforming stencil: strong durability, but long production cycle, mainly for special process need

For selection stencil, need condering PCB design, space of components and solder paste, insure the best printing effect.

PCBA Stencil Usage and maintenance

To extend the life of the stencil and insure the quanlity printing,

the operation worker need regular clean the stencil, to avoid solder paste block the hole. When storing, need avoid squeezing or scratch, prevent deformation from accuracy

Conclusion

Although PCBA stencil is little part, but directly influence the quanlity and efficiency of SMT.

Reasonable selction, correct usage and regular maintenance can let stencil make the biggest value When the electronice manufacturer, and help high efficiently production.