Patent ID: 7637604

Claim:
A single pass progressive dot printing ink-jet process comprising the steps of: applying a first UV curable ink drop to a substrate; applying a second UV curable ink drop on to the first UV curable ink drop without intermediate solidification of the first UV curable ink drop; and subsequently applying additional UV curable ink drops sequentially to the combined first and second UV curable ink drops without intermediate solidification of the first and second UV curable ink drops; wherein a viscosity of the first to the additional UV curable ink drops applied varies in a graduated manner within a range of from 10 up to 30 mPa·s or a range of from 30 down to 10 mPa·s; and a curing speed of the first to the additional UV curable ink drops applied varies in a graduated manner within a range of from 20 up to 70 m/min or a range of from 70 down to 20 m/min.