Tempered glass stress removal

Thu, 25 Jun 2026 06:01:41 +0800

On a tempering line, the oven isn’t just a heater. It’s the last checkpoint before the quench, where you lock in the stress distribution. If the thermal field drifts, you’ll see edge warp, optical distortion, or even spontaneous fractures out in the field. So when we talk about stress removal in tempered glass, we need heating that’s repeatable, fast, and uniform across the whole load. What we lean on, technically We build the stress-removal heating around short-wave infrared (SWIR) quartz emitters. They respond quickly and couple directly into the glass. The system runs 100–200 kW, on 380/400 V three-phase, mounted on compact modular frames that drop into existing oven zones. Control is closed-loop SCR or PID with thermocouple feedback, holding setpoint within ±2 °C across the glass surface. That gives you a stable soak that cuts down thermal gradients before quenching, so the glass tempers evenly and residual stress stays in spec. Why it fits the way we work This approach plays nicely across tempering, bending, coating drying, lamination (EVA/SGP/PVB) curing, and insulating glass sealing. In tempering, it shortens the soak and tightens the stress profile, so first-pass yield climbs. In bending, you get repeatable sag control without hot spots. In lamination, it brings the stack up to curing temperature fast while keeping edge overheat in check, which helps with optical defects. Energy use drops too, because the emitters heat on demand instead of chasing temperature by moving a lot of air. The details that matter on the floor Installation is straightforward on most lines, but alignment is tight. Emitter-to-glass distance and the view factor have to be set right to avoid shadows. SWIR emitters are efficient, but they want clean power and proper cooling. Voltage sag and coolant flow issues will show up as drift. Plan a short commissioning window to tune zone balance and sort out emissivity effects across coated or tinted products.

Removal on Pure Quartz Infrared Heat

Tempered glass stress removal