How to improve PET preform heat absorption

Mon, 29 Jun 2026 22:36:12 +0800

The blow molder is running, but the preforms still aren’t heating evenly. You watch thin walls blister while the shoulders stay stubbornly cool, and the press keeps hunting for a stable cycle. The issue isn’t raw heat output—it’s heat absorption. If the preform can’t take energy efficiently, the heating tunnel fights itself, and you waste power and time for nothing. What matters, technically We set up infrared heating for PET preforms with spectral output matched to PET and tight lamp geometry. Short-wave quartz emitters punch high intensity in the 1.0–1.6 μm band, tuned to the PET absorption curve. Energy goes into the preform, not the machine frame. Each emitter is rated 1,000–3,000 W, with standard R7s connectors and 100–240 V compatibility, so it drops straight into existing heating tunnels on Sidel, Krones, SIPA, Husky, SACMI, and Nissei ASB blow molders. Reflectors focus the beam onto the neck and body, cutting stray heat and keeping the lamp face temperature lower. Why it works on the floor Even absorption gives you two practical wins. The preform hits set temperature faster, so you can shorten the oven section and trim cycle time. Temperature spread narrows, stretch becomes uniform, and bottle quality settles. On the same line speed, we’ve seen heating time drop 10–20%, with fewer rejects from crystallinity and wall thickness issues. Energy use falls because the lamps deliver more useful energy per watt, and the cooler tunnel helps extend component life. Here is what to keep in mind Installation is plug-and-play on the lamp holders, but the real gain comes from retuning the heating profile. Start by mapping temperature across the preform length, then adjust lamp power zones and dwell time. One constraint: if the tunnel is too narrow, focus gets tight, and you may need to back off power slightly to avoid hot spots. We provide preset curves for common preform weights and colors, and reflectors should be checked for cleanliness every two weeks.

Improve on Quartz IR Heating Bulbs

How to improve PET preform heat absorption