Screen Printing Exposure Calculator
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Screen exposure: why “seconds on the timer” is the last number you should trust blindly
A clean stencil is the intersection of chemistry, optics, mechanical contact, and record-keeping. The calculator above only handles one narrow slice: the relationship between UV irradiance, time, and energy density when your meter and your target dose share consistent units at the stencil plane. Everything else—emulsion class, mesh, halftone, ink system, humidity—still belongs to your process control.
Measuring irradiance where it matters
Manufacturers specify exposure doses for films and emulsions under defined measurement conditions. If your radiometer reading is taken at the glass instead of the emulsion stack, or with the vacuum frame open, you are not comparing apples to apples. Small geometry differences change seconds more than beginners expect—which is exactly why the scenario rows swing time when irradiance moves ±10%.
Step wedges and washout are still the ground truth
Even perfect math cannot smell undercured photopolymer. A controlled step test, documented lamp hours, and a repeatable washout protocol will beat any single-point formula. Treat online calculators as whiteboard sketches that help you bracket a test matrix, not as a replacement for a proof print.