Faster production on a UV light curing conveyor starts with arithmetic, not experiments. If you can predict the dose a part receives at a given belt speed, you can set the line's speed from the adhesive's data sheet instead of guessing and scrapping parts. Q: How do you calculate UV dose on a curing conveyor? A: Dose (mJ/cm²) is irradiance (mW/cm²) multiplied by the time a point on the part spends under the lamp. On a conveyor, that time equals the lamp's illuminated length in the direction of travel divided by belt speed. Double the belt speed and the dose halves; halve the speed and it doubles. The Three Numbers You Need Every dose estimate on a conveyor comes down to three inputs: Peak irradiance of the lamp head at the working distance, in mW/cm². Illuminated length along the belt, in inches. Belt speed, converted to inches per second. Belt speed is usually quoted in feet per minute, so convert first. Multiply by 12 to get inches per minute, then divide by 60. On Incure's CDM™ conveyor, which runs from 1.5 to 12.0 ft/min, that gives a range of 0.3 in/s at the slowest setting to 2.4 in/s at the fastest, with the nominal 6.0 ft/min setting at 1.2 in/s. A Worked Calculation Using Published Head Data Take the CDM™ + M51 focused-beam head. Its published peak is 6,150 mW/cm² at 365 nm across a 5-inch illuminated length. At 6 ft/min (1.2 in/s), a point on the part spends 5 ÷ 1.2 = 4.17 seconds under the beam. Multiply: 6,150 × 4.17 ≈ 25,630 mJ/cm², which matches the 25,630 mJ/cm² UVA figure Incure publishes for that configuration at 6 ft/min. The same method checks out on a flood head. The CDM™ + L64 has a 6-inch length along the belt and 1,900 mW/cm² peak at 385/395/405 nm. At 12 ft/min (2.4 in/s), dwell is 6 ÷ 2.4 = 2.5 seconds, and 1,900 × 2.5 = 4,750 mJ/cm². At 1.5 ft/min (0.3 in/s), dwell is 20 seconds, and the result is 38,000 mJ/cm². Those are exactly the two ends of the L64's published dose range. Running the Calculation Backward The more useful direction is usually the reverse: start from the dose your adhesive needs and solve for belt speed. Required dwell (s) = required dose ÷ irradiance Belt speed (in/s) = illuminated length ÷ required dwell As a hypothetical, suppose an adhesive's data sheet calls for 15,000 mJ/cm² and you plan to use the L64 at 1,900 mW/cm². Dwell = 15,000 ÷ 1,900 ≈ 7.9 seconds. Belt speed = 6 ÷ 7.9 ≈ 0.76 in/s, or about 3.8 ft/min. If that speed is too slow for the takt time of the upstream station, the calculation has already told you the lamp head, not the belt, is the constraint — before any parts have been run. Email Us with your adhesive's dose requirement and target line speed, and Incure can run the numbers against each CDM™ lamp head. Arc Heads: Use the…