Fixing Those Annoying Heat Gaps in Your KHS Blow Molder
Ever pull a batch of PET bottles off the line and see that weird pearlescence or spots where the walls are way too thin? It’s frustrating. Usually, it just means your heating isn’t uniform. Either your IR lamps have drifted or the heat field has just given up the ghost. We make quartz IR lamps that slide right into KHS systems to plug those thermal gaps and get your bottles looking right again. The secret is in the winding. Here’s the thing: heat uniformity comes down to how the tungsten filament is wound and how pure the quartz is. If the winding is loose, you get “cold spots.” That’s a nightmare because the preform stretches unevenly, and you’re back to squaring off with quality control. We keep our winding tolerances tight. This keeps the watt-density steady across the whole tube. Plus, we spec these to hit the exact voltage and wattage your KHS oven expects. You get a concentrated punch of heat exactly where the plastic needs it. Built for the grit of the factory floor. We use high-purity fused quartz because we don’t want the tube absorbing the energy—we want that energy hitting the plastic. Depending on your setup, we use R7s or Sk15 connectors. We know these machines vibrate. A lot. So we build the connectors to take a beating without shaking loose. A quick heads-up on the setup. Once you swap in these lamps, your heat field is going to be much more intense and consistent. That’s great, but it might shift your sweet spot for blowing temperatures. You’ll probably want to tweak your PLC setpoints by a few degrees so you don’t accidentally overheat the neck of the preform. And a pro tip? Keep the tubes clean. Oil and dust are the fastest ways to kill a lamp. Keep them spotless, and they’ll last you a long time.