PET bottle blow molding preheating

Mon, 08 Jun 2026 04:22:21 +0800

On the blow molding floor, preform temperature is the first hard constraint in the stretch blow molding window. If heating is uneven or drifts, you get flash, weak biaxial orientation, and a heap of scrap before you see one good bottle. We build infrared preheating setups that put repeatable energy into the preform neck and body, so your Sidel, Krones, SIPA, Husky, SACMI, or Nissei ASB runs the way it was meant to. What matters, technically We match the emitter to the preform cycle. Short-wave halogen quartz for fast response. Medium-wave when you want a broader, gentler profile. NIR when you need deeper, more uniform heating. Typical ratings are 100–1,000 W, 100–240 V, with quartz tube lengths sized to the heating tunnel. R7s or custom connectors give you a direct drop-in fit. Spectral output is tuned to PET absorption, and the reflectors are shaped to concentrate energy where the preform needs it—neck ring to shoulder, shoulder to body. The result is stable surface temperature with minimal overshoot. Why it works on the line Infrared preheating shrinks the time between preform indexing and the blow station. That shortens cycle time and helps stabilize bottle geometry. With a tighter temperature band, you cut brittleness and stress-whitening, scrap drops, and you can keep the same mold running lighter material without sacrificing strength. Energy use comes down because the heat is delivered on demand and focused, not wasted heating the air. Replacement intervals stretch, too, since the emitter and holder are matched to the OEM tunnel geometry—fewer hot spots and less thermal shock. The details that keep it honest Installation is straightforward, but alignment is not optional. Tube position, reflector gap, and the preform path all have to be within tolerance. Double-check voltage and connector type against your blow molder’s spec, and make sure the power profile lines up with preform wall thickness and cycle rate. On high-humidity lines, keep the quartz clean and dry. Moisture shifts output and shortens service life. Plan for routine inspection, and the heating window stays consistent shift after shift.

Bottle on Warm IR Patio Lab Systems

PET bottle blow molding preheating