On the blow molding line, the heating tunnel is where the game is won or lost before the mold even closes. Uneven preform temperature across zones, drift that creeps in when ambient conditions swing, and lamps that don’t follow the OEM heating curve—those issues add seconds, scrap, and stress to every cycle. A dedicated PC preform heating zone controller puts the heat profile back where it belongs: under your control. What matters, technically We built this controller around short-wave infrared (IR) emitters, tuned specifically for PET preform heating. It delivers closed-loop, zone-by-zone control with ±1°C stability across the heating tunnel, using thermocouple feedback to adjust lamp output in real time. The unit runs on 200–240 V and interfaces with common R7s sockets and quartz halogen lamp assemblies, so you can swap components without rewiring the whole tunnel. Each zone is independently regulated, which means you can fine-tune neck heating, body stretch, and base transition without touching the neighboring zones. Why it works in stretch blow molding Consistent wall thickness and bottle stability start with consistent preform temperature. This controller matches the OEM heating curve for Sidel, Krones, SIPA, Husky, SACMI, and Nissei ASB blow molders, so you get repeatable profiles with fewer startup sheets. You’ll see tighter bottle weight control, less flash and stress whitening, and faster ramps to line speed. Energy use drops too—zone-matched output avoids overdriving lamps just to compensate for drift. The practical details Installation is straightforward, but the heating tunnel is a harsh environment. Keep the controller away from direct heat and vibration, and make sure your lamp type matches the rated emitters. Expect a short commissioning window to tune the PID settings for your specific preform geometry and line speed. Once set, the controller holds the profile, but you still need routine thermocouple checks—accurate control depends on clean, well-positioned sensors.