This is is an outline presentation on the PCB printing process. It is geared towards students or new employees who do not have any experience in the PCB assembly arena.

1. Business Electronics Soldering
Technologies
Solder Paste Printing Basics
Bob Wettermann
MIT

2. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
Paste Printing
 Load
 Align
 Squeegee
 Blades
 Enclosed Head Technology
 Inspect / Paste problems

3. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Load / Align
 Manual
 Automated
Paste Printing

4. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Load
 Manual
 Automated
Paste Printing
PCB
Camera

5. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Squeegee
 Metal
 Polyurethane / rubber
 Rolls paste across apertures
 30O
-60O
angle of attack
Paste Printing

6. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Squeegee
 Metal

Stainless

Nickel alloy
Paste Printing

7. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Squeegee
 Metal
 Polyurethane / rubber
 Rolls paste across apertures
 30O
-60O
angle of attack
Paste Printing

8. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Squeegee
 Metal
 Polyurethane / rubber
 Rolls paste across apertures
 30O
-60O
angle of attack
Paste Printing

9. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
Stencil
PCB
Paste Printing

10. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
Paste Printing
 Squeegee
 Speed

.2 – 8 in/ sec

Pressure
 .7 – 1.5 lbs
 Faster = higher

11. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Separation
 Separation distance

Very slow
 To transport height

Quick
Paste Printing

12. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Separation
 Separation distance

Far enough for “Snap off”

Very slow (.01”/sec)
Paste Printing

13. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Separation
 Separation distance

Too fast
 Leaves paste
Paste Printing

14. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Good Solder
Paste Printing

15. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Slump

Too much heat

Paste too thin
(Low viscosity)
Paste Printing

16. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Dog Ears

Snap off too fast

Squeegee too fast
Paste Printing

17. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Bleed out

Pressure too high

Poor gasket
Paste Printing

18. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Scooping

Damaged squeegee

Too much pressure
Paste Printing

19. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Torn prints

Snapoff too fast

Clogged stencil
Paste Printing

20. Your BEST choice in Solder Rework/Repair, Solder Training & Soldering Tools
 Paste Inspection / Problems
 Paste left on Screen

Damaged squeegee

Pressure too low

Speed too high
Paste Printing

21. Business Electronics Soldering
Technologies
Solder Paste Printing Basics
Bob Wettermann
MIT
bwet@solder.net
www.solder.net