Ideal temperature for PET preform blowing

Tue, 23 Jun 2026 16:21:49 +0800

On the blow molding floor, the heating tunnel is where the whole run lives or dies. If preforms come out at 90°C instead of the sweet spot—105–115°C—you’re staring down haze, weak stretch, and scrap that climbs fast. Let the lamps chase the setpoint and overshoot, and you’re burning polymer, wasting energy, and burning through lamp life. We built this infrared upgrade to break that loop. What matters under the hood We match the OEM heating profile with short-wave infrared emitters tuned to how PET actually absorbs heat. The quartz envelope runs at 220–240 V, hits standard R7s connectors, and drops straight into Sidel, Krones, SIPA, Husky, SACMI, and Nissei ASB tunnels without rewiring. Power density is set so the preform surface hits target quickly while the core stays even—no hot spots, no cold bands. Response is quick, too: the lamp hits stable output in seconds, so setpoint changes track without lag. Stretch blow molding lives and dies on temperature control. With this emitter upgrade, you sit inside the ideal preform temperature window more consistently, so parison stretch is uniform and you can trim bottle weight without giving up strength. On the floor, that shows up as 3–5% less scrap and a 4–6% cycle-time gain on 0.5 L bottles, because the heating tunnel stops fighting variability. Heating-block energy drops 8–12%, and lamp life stretches to 5,000+ hours, which means fewer changeouts and less downtime. Here’s what to watch for It’s plug-and-play only when the reflector geometry and lamp spacing match your blow molder’s tunnel. If you run at very high line speeds, double-check the power rating per zone to keep the temperature band tight. Plan on a 30-minute tunnel recalibration after the first changeover to lock in the new profile.

Ideal on Pro-Grade Warm IR Heating

Ideal temperature for PET preform blowing