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Glossary

Clicking a letter link will take you to the relevant section.

 
UCR
Abbreviation for undercolor removal. Three-color process printing does not produce a good black. Adding black (four-color process) causes other problems, such as excess ink on the page (Note: it is always impossible to trap 400% ink). "Undercolor removal" is the additional work done in color separation to reduce the amounts of yellow, magenta, and cyan to compensate for the addition of black ink. See gcr.

ULTRA VIOLET RADIATION
Also UV. See radiation curing (of inks).

UNCALENDERED
Papers that are not smoothed by going through the calendering process.

UNCOATED FREE SHEET
An uncoated paper free of ground wood pulp.

UNDERRUN
Production and delivery short of the quantity ordered. Trade customs allow for a certain tolerance for overruns and underruns. A quantity of paper made which is less than the quantity specified in the order. See overruns.

UNIT PERFECTING PRESS
See blanket-to-blanket press; perfect/ perfecting press.

UNIT SET FORMS
Generally a single form in a multi-ply business forms format. May be printed or converted by sheet or web printing methods. See continuous forms.

UNITIZED PRESS
A press composed of a series of independent printing stations each station printing only one image on one side of the paper. The press may be either sheet or web fed in design. Most often found in the forms business.

UP
A term used to describe how many similar sheets can be produced from a larger sheet; two up, four up, etc.

UV
Abbreviation for ultra violet radiation. See radiation curing.

UV COATING
A slick, glossy coating applied to the printed paper surface and dried on press with ultraviolet (UV) light. The slick surface of UV coating makes it popular for printing the covers of paperback novels.

UV INK
Ink specially formulated to dry quickly with ultraviolet (UV) light while still on press. UV drying improves turnaround time because it eliminates waiting time for the first side to dry before printing the second side. See radiation curing; special inks composed of materials that set and dry by being exposed to ultraviolet radiation.


 
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