On the spectacle glass line, annealing isn’t some gentle finale—it’s the last gate that decides whether the lens ships or hits the scrap pile. When the heat isn’t even, residual stress just lays low until final inspection, and suddenly the rework pile is out of control. We built our spectacle glass annealing lamp to put repeatable thermal control into the process, plain and simple. No more guesswork.
What matters under the hood
The unit runs on short-wave infrared quartz emitters, chosen because they respond fast and dump heat directly into the glass. That cuts the dependence on convection, which is what tends to create hot and cold bands. Output is tuned for annealing duty, with tight spectral control so the surface doesn’t get hammered while the bulk of the glass hits the soak window. The emitters run on standard industrial voltages, and the housing is designed to fit into existing annealing stations without forcing a line redesign.
Why it holds up on spectacle glass
Spectacle lenses need uniform stress relief across curves and across thicknesses that change from one run to the next. Our lamp keeps a stable thermal field that holds setpoint instead of chasing drift, so annealing behaves like a controlled step—not a wild card fighting polishing and coating. You end up with fewer stress fractures, less warpage, and a yield that doesn’t yo-yo. On the floor, cycles get shorter because the lamp comes up to temperature fast and resets quickly between batches.
Here’s the thing: it’s radiant heat, so line-of-sight matters. Fixture alignment and emitter-to-glass distance have to stay within a tight window to keep the temperature spread consistent. We give you the mounting data and the tolerances spelled out.
And quartz emitters don’t like contamination. Handle them with clean gloves and keep the reflector free of dust. Set it once, lock it down, and it will run shift after shift.