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Shown below are the definitions for: U
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ucr Abbreviation for "undercolor removal"-, also see "gcr". 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.
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ultra violet radiation Also UV; see "radiation curing" (of inks).
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underruns A quantity of paper made which is less than the quantity specified in the order; see .. overruns".
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unit perfecting press See "blanket-to-blanket press"; also see "perfect/ perfecting press".
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unit set forms See "continuous forms"; generally a single form in a multi-ply business forms format. May be printed or converted by sheet or web printing methods.
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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.
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uv inks See "radiation curing"; special inks composed of materials that set and dry by being exposed to ultraviolet radiation.
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uv Abbreviation for ultra violet radiation; see .'radiation curing".
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