When to consider running your job on a digital press
Digital presses came onto the market in the late 1980's. The presses were slow and prone to breakdowns. It was said that some press manufacturers made customers purchase two machines so that at least one was running at all times. The quality was just OK, usually looking like a photocopy.
Times have changed and the digital press industry has grown up. That's putting it mildly. With players such as Xerox, Kodak and Hewlett-Packard as industry leaders, the technology is good and getting better.
The biggest improvements have come in quality. I'm most familiar with Xerox's Igen3 press. This press prints 14 X 22 sheets with amazing quality. The sheets this press puts out aren't quite as nice as a good sheetfed press sheet, but it's not far off. Images are rich in color and ink coverage is good, even on solid areas.
The two major reasons to utilize the capabilities of a digital press are run length and a need for variable data.
Run Length
Digital presses are economical on short runs-very short. Make-ready times are very quick on a digital press and don't require a lot of paper. By contrast, make-ready times can be quite lengthy on a conventional press and use from 200 - 2,000 sheets, depending on the job. This makes short runs very economical on the digital press.
However digital presses don't run very fast. The fastest Indigo runs at 2,000 sheets per hour. Conventional offset presses run anywhere from 7,000 to 15,000 sheets per hour.
You can also print more pages (up to 16 pages, 8 ½ X 11) on a conventional offset press. Digital presses can run only 4 pages, 8 ½ X 11 on a single press sheet. That translates into higher costs on a digital press for booklet jobs.
You don't have to be a math wiz to see it doesn't take long before the digital press is no longer economical. The chart below shows some comparative pricing of jobs printed digitally and conventionally. The pricing is based on an 8½ X 11 page size printing four-color process on 80# gloss enamel text. Booklets are saddle stitched.