Running a Controlled Stencil Separation-Speed Trial

Stencil separation is one variable in the printing process. A useful speed trial changes that variable deliberately and captures the resulting deposit shape and consistency. Adjusting separation, pressure and paste preparation together makes it difficult to learn which change mattered.

Define the defect before changing the program

Alpha’s SMT troubleshooting guide identifies separation speed as a variable in poor print definition and notes that suitable settings depend on paste chemistry. Its guidance supports a material-specific trial rather than a universal fastest or slowest setting.

Record the observed feature, affected apertures and current recipe. Preserve images showing the deposit condition immediately after printing. If the problem appears only after later handling or heating, establish that sequence before calling it a release defect.

Hold the surrounding conditions steady

Choose candidate settings within equipment and material guidance. Document whether the machine uses a single separation speed or a more detailed movement profile. A similarly named setting on another printer may describe a different portion of the motion.

Capture the sequence of prints

Record trial order and any pause between conditions. Inspect both initial and repeated prints as required by the plan. If cleaning or paste replenishment occurs during the trial, label the event and consider whether the comparison needs to be repeated.

Evaluate deposit form as well as a numeric volume result. A similar total volume can be distributed differently around an aperture. Keep photographs and location-specific measurements together so the process decision is reviewable.

For example, one candidate may improve release at a difficult feature while worsening a neighboring aperture family. Report that tradeoff explicitly and review tooling or other process options rather than selecting only the favorable locations.

Keep rejected trial conditions in the evidence set with their observed outcomes. They explain why the released setting was selected and help a later reviewer avoid repeating the same unsuccessful adjustment when a superficially similar defect returns.

Verify the chosen operating condition

Confirm the selected setting through a representative production sequence, including the relevant restart and cleaning events. A successful short comparison should lead to a defined release, not an undocumented operator preference.

Save the final recipe revision and the evidence supporting it. Review applicability when paste, stencil construction or board support changes.

The step-stencil guide covers transition-specific effects, while post-cleaning review checks a separate source of short-lived print variation.