On the insulating glass line, the second seal is where the line speed meets the risk. Silicone needs heat fast, but if that heat isn’t even, you end up with uncured beads, thermal stress, and a pile of rework. We built our infrared curing modules to handle that trade-off in actual production, not in theory.
What matters under the hood
We run short-wave infrared emitters in a focused, line-of-sight setup. The energy hits the silicone directly, without turning the whole frame into a hot plate. That gives you a controlled thermal profile that stays inside typical silicone cure windows, often hitting the required surface temperature in seconds instead of minutes. Output tracks line speed, and the beam pattern is shaped to cover the seal path evenly—no hot spots that bubble or skin over while the core stays soft. The unit drops straight into common IG sealing stations, with standard mounting and wiring that keeps changeover under an hour.
Why it fits the way the line runs
IG lines live on takt time. Infrared gets the silicone to cure temperature quickly, so the second seal doesn’t become the bottleneck. Because the heat goes right where it’s needed, the surrounding area stays cooler. That cuts down unwanted convection and eases the load on plant HVAC.
The payoff shows up as fewer temperature-related defects, higher first-pass yield, and less scrap from adhesion failures after dicing. Energy use drops too, since the emitters only draw when the seal is present and at the set point—no steady burn like a full-room oven.
Here are the practical details
Infrared curing is line-of-sight, so fixture geometry matters. Spacer edges can cast shadows and create uneven heating unless the emitter layout and reflectors are matched to the seal path. Plan on a short commissioning run to dial in distance, power, and speed for your bead profile and silicone formulation.
And keep the emitter window clean. Dust and overspray scatter energy and drift the profile. A quick weekly inspection keeps the process stable and the line moving.