On the plant floor, the heating tunnel is where you earn your keep. Polycarbonate preforms move through, and the window for uniform heating is tight. Too cold, and you get weak stretch, crystallization, or blow-out. Too hot, and you risk yellowing, degradation, and wasted material. If the infrared emitters underperform, every downstream station pays for it—scrap, slow cycles, and rework. We supply polycarbonate preform infrared solutions that drop straight into your blow molders—Sidel, Krones, SIPA, Husky, SACMI, Nissei ASB—without re-engineering the line. The approach is straightforward: match OEM parameters, deliver stable output, and keep your heating window repeatable, shift after shift.
What matters technically
Polycarbonate absorbs infrared differently than PET, especially in the near-infrared (NIR) band. If the spectrum is off, you chase surface heat while the core lags, or you overshoot and stress the material. Our emitters are tuned for PC, delivering a tight output band that penetrates quickly and evens out the temperature profile. We build the heating core around short-wave infrared halogen quartz emitters, chosen for fast response and predictable spectral output. Each lamp runs on standard voltages (220–240 V, 380–400 V), with wattage matched to the preform geometry and your machine’s heating tunnel length. You get the same interface as the original: R7s connectors, quartz tube dimensions, and mounting hardware that install without modifications. Key specs you can plan around:
- Peak wavelength tuned for PC absorption, not generic PET settings
- Power density matched to preform wall thickness and cycle rate
- Rapid start-up, so you can pull heat quickly when the line starts or changes grade
- Reflector geometry that focuses the pattern onto the preform shoulder and body, reducing stray heat on the neck
- Repeatable output tolerance, so the first piece matches the thousandth Every lamp goes through a burn-in and measurement process, checking output stability, hot-spot uniformity, and connector integrity. The result is a heating block you trust to hit setpoint, not just on paper.
Why it works where you run it
Polycarbonate blow molding demands tight control. The material has a narrower processing window than PET, and it shows stress quickly if heated unevenly. In stretch blow molding, inconsistent preform temperature translates directly into inconsistent bottle weight, wall distribution, and top load. Our infrared solution is built around that reality. The spectral match gives you faster throughput without chasing temperature drift. The emitter response is fast enough to trim heat quickly during grade changes, so you spend less time on setup and less material on start-up scrap. On the machines you run, this matters:
- Sidel SBO and SBO Compact lines run at high rates; the heating tunnel has to deliver stable heat in a short dwell. Our emitters keep the preform profile within tolerance, so blow station pressure behaves predictably.
- Krones Contiform and similar rotaries depend on consistent timing. With our matched emitters, you reduce temperature swing between cavities, which smooths out fill weight and cuts rejects.
- SIPA, Husky, SACMI, and Nissei ASB systems each have their own tunnel geometry. We match the lamp length, power, and mounting to the OEM footprint, so you don’t rework brackets or re-balance airflow. You also see the operational gains that matter on the board:
- Energy use drops because the emitter delivers heat where it counts, with less waste to the tunnel structure.
- Downtime for lamp replacement falls, since the quartz assembly and connectors are built to run long cycles under repeated thermal shock.
- Quality becomes steadier. When preform temperature is repeatable, bottle thickness, clarity, and top load fall within spec with less adjustment.
The practical details that keep it running
Installation is straightforward when you plan for it. These emitters are plug-and-play only if the machine’s socket, voltage tap, and mounting are aligned. Confirm the voltage per zone, the connector type (typically R7s), and the lamp length before ordering. If your line has variable power controls, we match the lamp’s resistance curve so the control responds as the original did. One constraint you can’t ignore: infrared emitters are sensitive to the environment in the tunnel. Dust, coolant mist, and solvent residue can coat the quartz, and that film changes output fast. Keep the tunnel clean and the airflow consistent. In harsh environments, schedule a quick wipe and inspection at each preventive maintenance window. It’s a small task, but it prevents output drift and extends lamp life. Also, polycarbonate is more sensitive to overheating than PET. If you run the same power settings you use for PET, you will push the material. We calibrate the system to PC, and we recommend setting the temperature profile conservatively, then adjusting by bottle performance rather than by arbitrary setpoints. If you are converting a line from PET to PC, the heating zones may need rebalancing. The neck and shoulder often need different energy than the body. We provide zone-by-zone recommendations based on your preform and machine model, so you don’t guess. We back this solution with an OEM-aligned build: material selection, quartz workmanship, strict output testing, and supply capacity that matches your maintenance schedule. Whether you run a single blow molder or an entire plant network, the goal is the same—heat the preform right, keep the line moving, and make bottles that pass spec without fuss.