On a Krones stretch blow molder, preform heating is the line’s balancing act. If the heating tunnel doesn’t pull its weight, you get uneven wall distribution, flash, and the reject rate starts climbing. If the lamps spike or drift, you spend the day chasing temperature and watching energy costs creep up. The fix starts with the right Krones PET preform oven parts—specifically, infrared emitters spec’d to the machine.
What matters, technically
We spec Krones oven replacements around short-wave quartz infrared emitters, matched to the machine’s power density and how it responds to heat. Typical ratings are 1.5–2.0 kW per lamp, 230–240 V, with R7s bases and exact envelope lengths to fit the reflector geometry. Peak wavelength lands around 0.9–1.2 μm, chosen so preforms absorb quickly without scorching the surface. Fast start-up—under 2 seconds—cuts warm-up wait and stabilizes the first bottle after a changeover. We hold OEM tolerances on filament geometry and reflector alignment so the heat profile stays repeatable.
Why it works on a Krones
On a Krones heating tunnel, consistent preform heating translates straight into stable stretch blow molding: fewer pinholes, tighter control on the neck finish, and less trim waste. Matched infrared emitters keep the temperature band narrow, so you can run higher output without chasing drift. Energy use drops because the heat goes into the preform, not into cooking the tunnel. Replacement intervals stretch out, too, because the lamps are engineered to the same thermal cycle as the originals—less downtime, less maintenance labor.
The practical details
Installation is straightforward, but alignment is not optional. Reflector cleanliness and proper lamp seating decide whether you get even heating or hot spots. Verify voltage at the socket and make sure lamp wattage matches the oven zone. You’ll see a slight rise in surface temperature at the lamp ends—keep clearances, and follow the OEM wiring and grounding. Use only the specified connectors and mounting clips to prevent arcing and keep the lamp from shifting under vibration.