Fixing the Heat Headache in Krones Contiform Systems
Ever pull a batch of PET bottles off the line only to find that weird, cloudy pearlescence or—even worse—walls so thin they feel like they’ll pop if you look at them wrong? It’s frustrating. Usually, it comes down to one thing: your heat distribution is off. When that thermal field isn’t hitting the preform exactly right, your quality goes out the window. That’s why we make replacement lamps specifically for the Contiform series. They aren’t just “compatible”—they’re built to match or even beat the original heat flux specs.
The real secret to a steady heat field
Most blow molding lamps use short-wave infrared, but the magic is actually in the details. We obsess over where the tungsten filament sits and how pure the quartz glass is. Here’s the thing: whether you’re running 230V or 400V, that wattage has to be spread perfectly across the tube. If the filament winding is off by even a tiny bit, you get “cold spots.” We tighten those tolerances. It keeps the heat field flat, so your preforms get treated evenly from top to bottom.
Glass, plugs, and a little bit of science
We use heavy-wall quartz glass because, let’s be honest, high thermal loads make cheap tubes bow. Then there are the connectors—the R7s or SK15 types. It’s not just about making sure they fit into the socket. We make sure the electrical contact is tight. A loose fit causes arcing, and that’s a one-way ticket to a premature burnout. And if you’re struggling with surface scorching? We’ve got coated versions. They shift the emission spectrum, pushing the heat deeper into the PET wall instead of just frying the outside.
The trade-off you need to know about
High-wattage lamps are great for speed. You get more bottles out the door, faster. But there’s a catch. More heat means your oven’s cooling fans have to work a lot harder. If you decide to push the wattage higher than what the OEM originally suggested, keep a close eye on your ambient oven temp. You don’t want to cook your internal wiring. The best part? These are total drop-ins. Just pull the old lamps, wire them up, calibrate your zones, and you’re back in business. No need to tear the machine apart or modify a thing.