Quartz glass shield for UV lamp

Fri, 03 Jul 2026 11:49:53 +0800

Out on the press, when you’re running hybrid jobs that mix gel ink with water-based, you hit a familiar wall: the UV spectrum doesn’t line up with the photoinitiators. Wrong wavelengths burn power for nothing, the gel stays tacky, and the water-based layer overcures. The place to fix that is right at the lamp window. What matters under the hood The quartz glass shield on a high-pressure mercury vapor lamp acts as the spectral gatekeeper. It passes the core lines at 365 nm, 385 nm, and 405 nm while cutting the excess infrared that heats the substrate. You’ll see peak irradiance of 12–15 W/cm² at the arc distance, holding within ±2% over the life of the lamp, and dose delivery that stays consistent at 500–1,200 mJ/cm² depending on line speed. It also blocks the 185 nm radiation that makes ozone, so you can run ozone-free and keep sensitive substrates safe. With high thermal shock resistance, the shield keeps its spectral shape even at sustained power densities up to 120 W/cm lamp power. Why this lands on hybrid inks Hybrid sets need selective excitation. Hit the gel layer with 365 nm and you drive cure deep. Use 385–405 nm to top-cure the water-based side without skinning the surface and trapping solvents. Pair the shield with dichroic reflectors and you can shape the spectral power distribution so each layer gets the photon dose it actually needs. You get full cross-linking, a clean surface cure, and adhesion without heat buildup or stress between layers. The payoff is fewer rejects at higher speed, and a lamp that runs cooler, which stretches service life. Here are the shop-floor details Installation tolerances are tight. The shield has to sit flush against the lamp module—even a small gap shifts the spectral profile and can create hot spots. Double-check reflector geometry and the lamp-to-substrate distance so you’re on the specified arc gap. Quartz transmits UVC, so handle it with clean gloves and keep the interlocks engaged during lamp service. When you swap shields, expect the effective spectral output to change how the photoinitiators respond, so recalibrate dose and line speed.

Glass on UV Curing Link

Quartz glass shield for UV lamp