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?

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.

Read More: Double Sided PCB: A Detailed Guide for Beginners

#PCB Assembly

Oliver Smith

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. Reach Me Now>>
Oliver Smith

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. Reach Me Now>>

What Others Are Asking

What is the difference between a prototype PCB and a production PCB?

My project have gone through from design, prototype to mass production after lots of discussion and adjustment. Now the manufacturer are making our products in their product lines. And I would like to know is there any differences between the prototypes in my hand now and the final products output by the manufacturer?

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What Is PCB Assembly
Will Li

What Is PCB Assembly

PCB assembly refers to the process of assembling all electronic components such as resistors, transistors, diodes, etc. onto a printed circuit board, and the assembly

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