NUVA2

GEW’s DoseGuard Laboratory Unit is the perfect quality control system for any pressroom with multiple GEW UV-equipped machines. It offers a fast, simple and accurate method to measure the UV output of any GEW UV Arc or LED cassette across its entire width under standard conditions. The system can analyse any GEW cassette manufactured since 2000.

How does the DoseGuard Laboratory Unit work?

The DoseGuard sensor is mounted inside the Lab Unit, below the lamp mounting position. When a cassette is inserted, the Lab Unit will run the lamp at the selected power level and scan the entire length of the lamp. Irradiance in mW/cm2 is measured and UV dose at any speed is calculated for easy comparison of expected curing performance. Warning levels can be set to easily identify non-conforming cassettes and data can be simply exported via USB in Excel format.

What’s included?

All units include a cassette housing, a power supply, a heatsink, a fan and a touchscreen for operation.

UV cassettes are provided by the customer from the production systems to be analysed.

An ozone filter can be included as an optional extra, enabling the Lab Unit to be used stand-alone without the need for any extraction ducting.

The benefits for your press room

• Reduces rejects through early detection of under‑curing, enabling timely corrective action.
• Strengthens GMP compliance through reliable, auditable quality control reporting.
• Improves maintenance decisions through early detection of UV lamp ageing.
• Detects and clarifies the impact of reflector and quartz window conditions on curing performance.

GEW’s LED bench-top lab unit allows fast, accurate UV LED irradiation of samples or radiometers and can be specified with different wavelengths as required.

GEW’s LED lab unit utilises a high precision linear drive to pass a sample tray under the UV LED array.

Variable speed control ensures highly repeatable testing up to 100m/min with UV power adjustable in set increments and LED array height adjustable up to 25mm.

A simple magnetic hinged tray carries print samples or can accommodate an EIT radiometer for precise UV power measurement.

Controlling temperature is critical for many applications. GEW’s array of cooling options ensures even the most powerful UV systems do not damage substrates.

The UV curing process is energy-intensive and causes both direct and indirect heating of the target substrate, which in the majority of cases needs to be controlled. For safety reasons, some form of barrier behind the target substrate to shield off and dissipate stray radiation from the lamp is essential for protecting the machine and its operators. The three most common methods of substrate cooling that meet both of these requirements are:

Air cooled heatsinks
Water cooled heatsinks
Water cooled chill rollers

Where roll material is being processed, the most common solution for this is an extruded aluminium heatsink plate. GEW have a very neat solution for this which is integral to the UV lamphead and can be either air or water cooled, depending on the application. For the majority of processes this method is very effective, unless very heat sensitive materials are being used.