Fixing the Heat Issues on Your Krones Contiform 3 Pro
Ever pull a bottle off the line and realize the walls are uneven? Or worse, you’re seeing constant failures because of those annoying “cold spots” in the preform heating? It’s frustrating. Usually, it comes down to two things: the lamps aren’t hitting the right spectral output, or they’re just slightly out of alignment. We make drop-in replacement lamps for the Contiform 3 Pro that are built to match—or even beat—the original heat patterns. Getting the heat right These lamps run on high-voltage circuits because you need serious power to heat preforms fast. The trick is in the details. We keep the filament length and diameter incredibly tight. Why? Because it keeps the wattage steady across the whole tube. You won’t get that “bow-tie” effect where the middle is scorching but the ends are cold. Instead, you get a smooth, flat thermal curve. It just works. The build quality We use heavy-wall quartz glass. It has to be tough to handle the shock of heating up and cooling down over and over again. Depending on which version of the machine you’re running, these come with R7s or Sk15 connectors. We make sure the fit is snug. A loose connection is a nightmare—it creates resistance, causes arcing, and burns out your sockets way too early. Plus, we add a special coating to the quartz. It pushes the heat into the PET material where it belongs, rather than wasting it by heating up the oven walls. Real talk for the shop floor Here is the thing: these lamps put out a massive amount of heat. Please, check your cooling blowers. If they’re clogged with dust or just not spinning right, these tubes will bake your oven housing. And a pro tip: during the first 100 hours, keep an eye on your voltage settings. It takes a little bit of tweaking to get the profile exactly right for your specific preform weight. Also, don’t just swap one bulb. Replace them in full sets per zone. If you mix old and new lamps, you’ll end up with mismatched heat zones, and you’re right back where you started.