Introduction
We built these infrared halogen heating lamps for one reason: they’re exactly what PET blowing machines need. This job calls for heat that’s fast, focused, and doesn’t take up a ton of space. The whole point is to get those preforms hot, quickly and consistently, so your blowing cycle never misses a beat. To make that happen, we had to get the engineering right—packing in the power, making sure the fit is perfect, and nailing the connector details.
Let’s Get Into the Details: Power, Voltage, and Size
On a PET blowing line, the heater can’t be slow. It has to jump to temperature and hold steady, cycle after cycle. That’s why we push the wattage into a compact tube—think about 2500W packed into a 300mm body. It’s all about power density, so the preform gets the energy it needs without being overexposed. Voltage is chosen to match the machine’s setup. You’ll often see a 400V rating because it keeps the current lower for the same power. That means smaller wires and less heat building up at the terminals inside the heater block. And the length? It’s not random. A 300mm lamp gives you just enough emitting area to cover the preform’s shoulder and body, while still fitting neatly into standard reflector setups. Here’s the catch: packing that much wattage into a short space means heat spreads. Your machine needs solid airflow and proper heat shielding, so the control panel and nearby parts don’t start cooking.
The Build: Halogen, Coating, and the Right Connections
Halogen is the reason the output stays stable over the lamp’s life. The halogen cycle keeps the filament from blackening, so the infrared output doesn’t fade. The quartz envelope is built for the shock of rapid start-ups and the high filament temps needed for shortwave infrared. We add a reflective coating on the quartz to push energy forward. That sends more usable heat onto the preform and wastes less going backward. The payoff? Faster warm-up and more even heating across the surface. On the shop floor, connectors matter more than you’d think. R7s is the standard double-ended bayonet that clicks in fast and carries the load reliably. For certain mounts, SK15 gives you a tool-free connection that holds up to vibration and repeated swaps. Either way, it’s a drop-in replacement—swap the lamp without rewiring or tweaking the holder.
Why This Works for PET Blowing
In PET blowing, the preform needs to land in a tight temperature window—hot enough to stretch cleanly, without thinning or scorching. Shortwave infrared from a halogen lamp responds instantly, so the heater keeps pace with the cycle timing without overshooting. That’s how you get consistent bottle wall thickness and fewer rejects. The compact 300mm size slips right into existing heating tunnels and reflector setups, so you can upgrade without overhauling the machine layout. Add in 400V wiring and standard R7s or SK15 connections, and installation is straightforward: wire it, set the distance, and run. One reality check: this is a high-intensity heater. If you run it off-voltage or block the airflow, it will burn out fast. Keep the lamp clean, match the voltage, and it will deliver steady heat for thousands of hours.