Stencil Wipe Frequency and Under Stencil Cleaning The underside of a printing stencil collects paste with every board. If it is not removed, the paste builds up, blocks the apertures and transfers onto the next board in places where it does not belong. Wiping is the control, and how often…

Flexible Circuit Dynamic Bend Design Rules A flexible circuit that is bent once during assembly is a different design problem from one that bends ten thousand times in service. Repeated bending accumulates fatigue damage in the conductors, and the design rules that allow a single form will fail quickly under…

Cleaning Nozzle Maintenance and Spray Quality Control Cleaning is usually judged by its result rather than by its equipment, until a batch fails an ionic contamination test and the cause turns out to be a partly blocked nozzle. Spray quality drifts slowly, so the failure appears weeks after the change…

High Mix Production and Paste Jetting Economics Printing paste through a stencil has been the default for surface mount assembly for decades, and it remains the fastest way to deposit alloy on a board that will be built in volume. Paste jetting changes the economics for a different kind of…

PCB Placement Nozzle Handover: Passing It On Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB placement nozzle handover from the perspective of a PCBA factory floor, covering…

PCB Placement Nozzle Specification: Writing It Down Precisely Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB placement nozzle specification gives you a practical advantage when…

PCB Placement Nozzle Risks: What Could Go Wrong Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB placement nozzle risks gives you a practical advantage when…

Backdrilling: Key Checks Before Release A plated through hole connects the layers it is meant to connect, and it also creates a length of barrel below the lowest connected layer that serves no purpose electrically. At low frequencies that stub is invisible. At multi gigabit rates it behaves as a…

Droplet Volume Control in Small Volume Production Printing solder paste through a stencil is efficient because one squeegee stroke deposits every pad on the board at once. That efficiency assumes the board will be built in a quantity that justifies a stencil, an aligned printer and the setup time that…

PCB Placement Nozzle Review: A Second Look Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains PCB…