A UV cure conveyor is open by design: parts have to get in and out. That opening is also where stray UV, lamp heat, and moving parts meet the operator. Safety on a conveyor line is therefore a layout and procedure question, not just a matter of handing out goggles.
Q: What are the main operator hazards on a UV cure conveyor?
A: Stray UV at the infeed and outfeed, UVC on broadband arc configurations, lamp heat, and contact with a moving belt
Unlike a closed bench chamber, a conveyor cannot rely on a door interlock to contain the lamp, because parts must pass through continuously. The hazards cluster at four points: UV escaping through the belt openings and reflecting off parts and fixtures; UVC output from broadband arc assemblies; heat from arc lamp heads and their exhaust; and the mechanical hazard of a running belt. Each has its own control.
Hazard 1: Stray UV You Cannot Feel
UV at curing intensities does not announce itself the way visible glare or heat does. An operator can receive a meaningful exposure near a lamp opening without noticing brightness. Output levels on a conveyor are high — 1,900 mW/cm² at 2 inches for the CDM™ L64 and L88 flood heads at 385/395/405 nm, and 6,150 mW/cm² at 365 nm for the M51 focused beam — so the infeed and outfeed openings deserve the same respect as the lamp face. Controls that help:
- Position operator stations beside the conveyor, not in line with the openings.
- Keep reflective tools and fixtures out of the area directly under and beside the head.
- Never look into the openings to check whether the lamp is on; use the indicator or a radiometer.
Hazard 2: UVC on Broadband Arc Configurations
On the Incure CDM™, x2AC arc assemblies include a 254 nm UVC tube alongside the UVA tube, giving broadband output. x2A configurations run two UVA-only heads and carry no UVC component, which removes the UVC ventilation and PPE requirements associated with UVC exposure. When a process is qualified on x2AC, plan for UVC-rated exhaust and protection from the start; when a process is genuinely UVA-only, the x2A configuration avoids that layer entirely.
Email Us with your lamp-head configuration and floor layout and Incure can help identify where exposure controls are needed.
Hazard 3: Lamp Heat and Ventilation
Every arc configuration on the CDM™ needs forced-air cooling and exhaust ventilation to manage lamp heat, and a two-head x2A configuration adds a second head’s load. Treat the ventilation as a safety system: confirm it is running before the lamp is switched on, keep ducting intact and clear, and allow the lamp head to cool before any maintenance. Mercury-arc lamps also have a warm-up and cooldown cycle, so a lamp that has just been switched off is not yet safe to handle.
Hazard 4: The Moving Belt
The belt runs continuously between 1.5 and 12.0 ft/min. Standard machine-safety habits apply: no loose sleeves or gloves near the drive ends, no reaching under the head to retrieve a part while the belt is moving, and a clear stop procedure before clearing jams. Parts and carriers leaving the cure zone can be warm, so plan the outfeed handling accordingly.
Engineering Controls Beat Procedures
Where a control can be built in, it is more reliable than a rule. LED heads on the CDM™ accept PLC, RS-232, and foot-switch signals, which allows the lamp to switch on only when a part-present sensor sees a part and to switch off when the belt is empty — reducing the time any output is present at the openings at all. Arc heads on the same chassis have no external control port, so their containment relies more heavily on shielding, positioning, and procedure.
Eye and Skin Protection
Eyewear should be rated for UV and certified to ANSI Z87.1 and EN166, in a wraparound style, because exposure around a conveyor spreads across a wide field rather than arriving from one direction. Pair it with sleeves and gloves for anyone working close to the openings, and inspect lenses for scratches or cracks, which can compromise protection.
A Pre-Shift Safety Check
- Ventilation running (arc configurations).
- Shielding and guards in place at both ends.
- Lamp indicator and any part-present interlock working (LED configurations).
- Eyewear and gloves available and undamaged at each station.
- Area under and beside the head clear of reflective items.
- Stop procedure posted and known to every operator.
Head configurations, including which carry UVC, are listed in the Incure CDM™ UV conveyor guide. Where a fully enclosed cure is preferable for sample or rework work, an Incure B/C-Series™ cure chamber provides interlocked containment, and the general overview of conveyor curing is in the curing conveyor industrial guide.
Contact Our Team to review safety arrangements for your UV cure conveyor line.
Visit www.incurelab.com for more information.