Inert gas UV curing
Atmospheric oxygen reduces the effectiveness of UV curing in some inks and coatings. Reducing the oxygen level within the UV lamp housing increases production speeds significantly. Inert gas, typically nitrogen, is introduced to the lamp housing to displace oxygen, reducing it to a very low level.
The GEW solution
GEW have developed a compact system in which an inert curing chamber is built around the UV lamphead and sealed against a chilled roller. Oxygen is purged from the chamber using nitrogen gas, which is introduced in a controlled manner via a “nitrogen knife” at the web inlet and via an injector in the curing chamber. An oxygen sensor within the chamber continuously monitors the oxygen level, which is automatically regulated to the number of parts per million set by the operator.