unevenness
Lack of the uniformity of the density or thickness of the printed ink.
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UV lamp check-up
The life of UV lamp is regarded to have been run down when UV power comes to 70% of the initial condition. The life is approximately 1000-1500 hours. It is essential to maintain good condition of UV lamp to cure the ink properly. It is necessary to measure the efficiency of the lamp regularly with UV power meter or UV integral light meter.
