How do components not get knocked off or fall off during reflow?

Last week we visited a PCBA factory. We were looking at reflow ovens. A lot of them have a metal conveyor belt the boards sit on. On a double sided board, when you put the board on the metal belt, won't the metal belt knock components off as they are only held on by paste?

PCB Assembly
November 6, 2023

Dots of glue are used where components may fall off. If components are on the bottom side of the board, then all are glued. Boards with bottom side components must be raised on stand-offs to provide clearance from the conveyor.

#PCB Assembly

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

Oliver Smith

What Others Are Asking

How do I remove kapton tape from soldered parts in bulk?

I have a batch of PCBs with SMT nuts which has been assembled onto a PCB – the nut has kapton tape on top to allow easy pickup for assembly. How can we do this faster/what’s a better method?

Oliver Smith November 23, 2023

Why do through-hole components fail to solder correctly down onto the PCB?

I am an electrical engineer in a company. Recently I am developed a new product in lab and making a sample for further confirmation. When I solder TH component, feel a little troublesome. Any soldering expert to help?

Oliver Smith September 13, 2023

Is aluminium foil a good substitute for kapon tape when soldering?

I want to desolder a tiny surface mount button from the motherboard of a phone. There are a lot of similarly tiny components surrounding it that I do not want to damage with heat from the soldering iron. Can I use aluminium foil in lieu of kapton tape to protect these components?

Oliver Smith December 5, 2023