UV Irradiators

Lamp Irradiator Assemblies

Our proven LIAs (UV Lamp Irradiator Assemblies)are UV reflector assemblies that provide an instant solution to reliable cooling of UV lamps to create a UV curing system. The lamp housing (lamp head) provides mounting and a highly efficient method of focusing UV energy onto the curing surface. Many engineers find that the most time-consuming aspect of building a UV curing system is controlling UV bulb temperature and focusing UV energy on the curing surface. Incorrectly maintaining lamp temperature severely degrades the performance and life of any UV lamp.

Middle section of UV irradiator with internal lamp head

Irradiator Construction

These UV irradiators consist of a heavy-duty housing supporting a linear extruded aluminum reflector heatsink and a UV reflector sheet insert, which acts as an enhanced reflectance liner. The UV reflector sheet is in intimate contact with the aluminum reflector finned extrusion allowing it to resist the heat-related yellowing that plagues other non-heatsink-based designs. In the event that the UV reflector sheet becomes damaged, it is easily replaced, minimizing downtime.

Our UV dryer reflectors are designed specifically for each ultraviolet lamp size. They maintain optimum arc lamp operation temperatures on the medium-pressure mercury vapor lamp envelope, end seals, and end fittings. The UV irradiator forms an air-cooling plenum, cooling the ultraviolet lamp end-fittings and not over-cooling the UV curing lamp envelope.

In addition to lamp cooling (these also work with a metal halide lamp) our Lamp Irradiator Assembly allows for cooling of the work surface and supporting the lamp above the substrate, reflecting UV energy in an efficient curing pattern.

The purpose of an irradiator assembly is to:

  1. Focus the lamp's UV energy optimally for fast curing.
  2. Support the lamp above the substrate.
  3. The lamp head maintains proper cooling of the lamp envelope, capillary, and end-fittings.
UV irradiator cross section showing UV lamp with aluminum reflector E-175

UV Irradiators (reflector assemblies)are used in conjunction with other UV components, such as magnetic ballast, or metal halide ballast and arc lamp, to form a complete UV curing system providing effective UV drying of your product. Replacement UV reflector liners or UV reflector sheets and lamps are also available.

Even Cooling

The heatsink-based UV irradiator system provides thermal mass to allow even lamp cooling. This mass prevents transient changes in heating/cooling from being immediately transmitted to the lamp and impedes localized imperfections in cooling from manifesting themselves into thermal gradients. Heat sink-based LIAs are inherently a more robust approach to uniform lamp cooling and result in longer UV lamp life. We also offer cost-effective heatsink-based highly UV reflective aluminum reflector extrusions in four standard sizes. These sizes include E-175, E-350, PO-50, and PO-70.

Heatsink based UV irradiators provides even UV lamp cooling
Thin sheet UV irradiators provides uneven UV lamp cooling

Efficient Cooling

Optimizing cooling efficiency in an LIA is achieved by using a heatsink-based aluminum reflector, where the material has high thermal conductivity and the design maximizes the effects of surface area and turbulence. Within reason, the more surface area the better the UV lamp cooling. Also important is turbulence, because of the skin effect in cooling. A thin layer of air surrounding a cooling surface acts as a thermal insulator impeding the effect of forced air cooling. This layer needs to be disrupted by turbulent airflow, which can be created by providing irregular fins and fin geometries. For those that want to design their own UV Irradiator for a very cost-effective UV curing system we offer highly UV reflective aluminum reflectors extrusions in four standard sizes, see our E-175, E-350, PO-50, and PO-70

UV lamp cooling with Heat sink based aluminum reflector E-175
UV Lamp cooling only using UV reflector sheet

Our LIA's offer :

  1. Longer UV-lamp life.
  2. More UV energy to the curing target improves your throughput.
  3. Two focus versions.
  4. Faster development time in implementing cooling for UV curing equipment.
  5. No design or tooling investment is required.
  6. Reduced parts count.
  7. An excellent option for a UV retrofit system.
  8. Improved quality and better UV cure result through consistent cooling.
  9. Flexible lengths for almost any UV system: can be used for lamp arc lengths from 4 to 100 inches.
  10. UV Irradiators also have applications in ultraviolet blood irradiation, sterilization, water sterilizers, and air sterilizer.
  11. Optional dichroic reflector quarts sheets.
UV irradiator with internal lamp head, dichroic reflector quarts sheets option

One of the most important features of our LIAs is the construction. This consists of a heavy-duty extruded housing that contains an extruded reflector profile (note these profiles are different than our stand-alone standard aluminum reflectors extrusions: E-175, E-350, PO-50, and PO-70 ). Inside this reflector profile is a high UV reflectance metal insert, which conforms to this profile. In addition to being rugged, the extruded UV reflector provides a large mass, which dissipates heat evenly. It allows uniform cooling across the entire UV lamp length. AC fans with appropriate wiring and lamp mounting provisions (lamp head) are also included.

UV irradiator as part of a complete UV curing system
Top view UV curing system using UV irradiator with internal lamp head

Two focus versions are available:

The elliptical version projects a one-inch wide focus approximately 2.5” inches from the bottom of the LIA to the curing surface, optional dichroic reflector quarts sheets are available.

Elliptical aluminum reflector: E-350, E-175

Non-focused (parabolic reflector) version projects an evenly diffused source of UV energy on the curing surface, approximately 4 to 5" wide, optional dichroic reflector quarts sheets are available.

Non focused Parabolic aluminum reflector: PO-50, PO-70

How much longer is the LIA than the arc of the lamp?

Bottom view UV irradiator, with UV lamp head, UV reflector sheet and mounting of UV lamp

* Overall length is approximately 10 to 11 inches longer than the lamp arc length.

Standard irradiators

Part Number Lamp Arc Length Irradiator Length
HIR1004 4.00" 14.06"
HIR1006 5.31" 16.75"
HIR1008 8.00" 18.93"
HIR10012 12.47" 23.71"
HIR10018 18.47" 29.28"
HIR10020 20.00" 30.65
HIR10025 25.47" 36.28"
HIR10030 30.47" 41.28"
HIR10032 32.00" 43.09
HIR10038 38.47" 49.28"
HIR10042 42.00" 52.81"
HIR10048 48.47" 59.28"
HIR10050 50.00" 60.81"
HIR10055 55.87" 66.68"
HIR10060 60.47" 71.28"
HIR10065 65.00" 75.81"
HIR10072 72.00"" 83.09
HIR10077 77.46" 88.28

* Above chart lists a few of our LIAs, note optional dichroic reflector quarts sheets come in 6" sections.