Stop Fighting Your SIPA Oven’s Hot and Cold Spots
Ever notice those annoying “cold spots” on your PET preforms? It’s a headache. Usually, it happens because the lamps you’re using aren’t actually pulling the power the machine expects. When you mix and match lamps with different tolerances, the heat gets uneven. We fixed this by building quartz infrared tubes that are made specifically for the SIPA rotary footprint. No guessing. It’s all about the electrical load Here’s the thing: the label on the lamp doesn’t tell the whole story. If your system is wired for a specific voltage and wattage, even a tiny 5% difference in a lamp can mess up the heat distribution across the whole oven. We keep our wattage tolerances tight. Why? Because when every lamp in the bank puts out the exact same IR intensity, you can finally stop messing with the heating profiles every ten minutes. It just works. The nuts and bolts of the build We use high-purity quartz glass because these things take a beating with rapid heating and cooling. They’re designed as simple drop-in replacements. Whether you’re dealing with R7s or SK15 connectors, they fit perfectly. But the real secret is in the filament centering. If that filament is even slightly off-center, you get uneven heat density. That’s how you end up with bottles that have weird wall thickness. We make sure it’s dead center. A quick heads-up for the floor Getting your power matched 100% kills that “zebra stripe” effect on preforms. Your thermal soak becomes stable, which is a huge relief. Just a word of caution: running these at full rated power puts more stress on your oven’s ventilation. If your cooling fans are clogged or just too small, the oven will get too hot, and you’ll lose the benefits of the power matching. Stick to the original OEM specs when you wire them up. Your lamps will last longer, and you’ll spend less time replacing them.