Getting Your PET Preforms to Actually Heat Through
If you’re running high-speed lines—think Krones Contiform or Husky HyPET—you already know the headache. The biggest bottleneck is always heat penetration. When the infrared energy doesn’t actually reach the core of the preform wall, things go south. You end up with uneven stretching and those annoying thin spots in the bottle. We built our replacement lamps to stop that. We basically tweaked the spectral output so it hits the PET polymer way more aggressively. The power side of things To get that heat deeper into the plastic, we pushed the wattage higher without changing the size of the lamp. By dialing in the voltage and current, we crammed more heat density into every millimeter of the quartz tube. It’s simple: the lamp hits its operating temp faster and stays stable, even when you’re cycling rapidly. You get a consistent heat soak. That means you can stop slowing down the machine just to compensate for cold spots. The build We use a heavy-wall quartz glass because the halogen cycle creates a lot of internal pressure. It needs to be tough. But the real secret is the internal coating. Instead of letting energy bleed out into the oven walls, it bounces that heat right back toward the preform. We stuck with standard R7s or Sk15 connectors, too. They’re drop-in replacements. You just pop them in. No rewiring sockets or messing with lamp holders. A few warnings from the field Here’s the thing: high-output lamps put out a ton of heat, which puts a lot of stress on your electrical gear. If you move up to a higher wattage tube, do yourself a favor and check your contactors and wiring. If a connector isn’t seated perfectly, it’ll arc and burn out under the load. Plus, take a look at your oven’s cooling airflow. You want to make sure the ambient temp doesn’t trigger a thermal trip when you’re running these lamps at 100%. It’s a small check that saves a lot of downtime.