Fixing Those Annoying Heat Spots in KHS Blow Molding
Ever pull a batch of bottles off the line and see those weird wall thickness variations or deformed shapes? It’s frustrating. Usually, it comes down to one thing: your preforms aren’t heating evenly. The culprit is almost always the infrared (IR) profile of your quartz tubes. If the heat isn’t hitting the plastic just right, the bottle suffers. That’s why we built our quartz lamps to match—and honestly, beat—the thermal performance of the original parts. The secret is in the build. Heat uniformity isn’t magic; it’s about how the filament is wound and how pure the quartz is. We use high-purity fused quartz so the IR light actually gets through instead of getting trapped. We also obsess over where the filament sits. By tightening those tolerances, we kill off the “cold spots” you find in those cheap, budget tubes. The result? The heat hits the preform consistently from one end of the oven to the other. No surprises. No headaches during install Nobody wants to spend a weekend rewiring racks. We designed these as simple drop-in replacements for KHS systems. We matched the electrical load and the physical size exactly. Since we use standard R7s or SK15 connectors, you can swap them out quickly during a maintenance window and get back to work. These lamps are built for speed, too. They handle high watt-densities, which means they ramp up fast. If you’re running high-speed PET production, you need that concentrated heat to penetrate the plastic instantly. A quick word of caution Here’s the thing: when you crank up the heat density to speed up your cycles, your oven’s ventilation has to work harder. Just make sure your cooling fans can handle the extra heat in the air. If they can’t, you’re risking melted wiring or burnt-out tubes. It’s a simple check, but it saves a lot of pain later. One last tip: we sell these in wholesale lots for a reason. When every tube comes from the same production run, they all have the same resistance and spectral output. This stops that annoying “striping” effect on your bottles and keeps your quality steady.