On the line, glass has no patience for uneven heat. A single hot spot in the lehr, a cold edge during coating cure—next thing you know, you’re looking at optical distortion, bow, or a hairline fracture that only shows up at final inspection. Stress relief infrared gives you a direct way to control thermal gradients before they get locked into the glass. What matters, technically We set up stress relief IR with NIR emitters that respond quickly and keep the spectrum tight: 20–60 kW per zone, wired for 240 V or 400 V. The emitters run hot, but the design keeps the heat where it belongs—on the glass surface—so you don’t waste energy to convection and you don’t cook nearby seals or belts. Zone spacing is matched to your glass width, and each module can be tuned independently to flatten the temperature profile across the ribbon. Why it fits the work we do In tempering, you need a uniform preheat so compression stays balanced and you don’t get edge roll-in. In bending, you need controlled sag so the glass hits the mold line without wrinkles. In lamination and coating drying, you need solvents to leave without boiling the surface. Stress relief infrared hits those marks with rapid, repeatable heating that shortens dwell time and keeps the process window stable. The payoff is fewer rejects, consistent optical quality, and throughput that doesn’t swing around. Here are the practical details NIR is line-of-sight, so reflectors, emitter alignment, and glass emissivity matter. Surface coatings and printed patterns change absorption, so the first pass needs mapping. The system works with most OEM line layouts, but you still need to verify clearances, cooling, and power distribution before installation. Plan a short commissioning run to set zone balance—keeps overshoot from showing up when you’re running line speed.