Offset Quality with Inkjet

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In the rapidly growing world of inkjet printing the holy grail is to deliver the same quality as offset litho, using the same papers as offset litho.

Sounds a simple aim, but as is often the case it sounds simpler than it actually is in practice. Litho printing has been around for many years and papermakers have developed coatings and paper finishes that work wonderfully with offset litho, where the paper surface accepts the oil-based ink while repelling water from the dampening system. When the process is changed to inkjet, and particularly water-based inkjet, the water repelling coating gives some strange results with generally unacceptable print quality through effects of uncontrolled dot spread and coalescence giving fuzzy text and strange, varying colour images.

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