SMT Process: Screen Printer

SMT Process: Screen Printer

It's a Machine that print solder paste on Copper pads of PCB (printed circuit board) 

using metal mask and squeegee 

Metal Mask

Solder Paste

Metal Mask and Squeegee

Screen Printer Process

Management Points:

• PCB Size (L,W,T) , PCB fiducial marks (X,Y) .
• Screen Printer Parameters like: Squeegee Speed (print speed), Print pressure (Squeegee force), Separation speed, Metal mask Cleaning Cycle.
• Solder paste should be ready (mixed for 2 min on 1000 RPM in mixer) and on room temperature.

Defects & Errors:

• Short Circuit ( Bridge)
• Excessive Solder Volume 
• Insufficient solder volume or area
• shifted print

Video Contents :

1. Homing machine
2. Load job file
3. Adjust conveyor
4. Insert magnetic block support 
5. Insert Metal mask
6. Add solder paste
7. Run production