Uu

uc
abbreviation for uppercase.

UCA
acroynm for undercolor addition

UCC
acroynm for Uniform Commercial Code; acroynm for Universal Copyright Convention.

UCR
acroynm for undercolor removal.

UCS
acroynm for uniform color space.

UF
acroynm for urea formaldehyde.

UL
acroynm for Underwriters Laboratories Inc. (US).

ULPA
ultra low particulate air filter for filtering 0.1 micron particles and larger.

ULT
abbreviation for ultimate.

UOM
acroynm for unit of measure.

UP
acroynm for unsaturated polyester.

UR
acroynm for urethane (polyurethane).

USEPA (EPA)
acroynm for United States Environmental Protection Agency.

USGPO
acroynm for United States Government Printing Office.

ultimate adhesion
the maximum adhesion strength attainable from a pressure sensitive adhesive after 72 to 96 hours of application.

ultimate strength
the maximum stress a material is capable of withstanding under a specified load or tension; stress at moment of rupture.

ultramarine blue
a natural or synthetic inorganic pigment with slight red cast, good fade resistance, fair transparency, poor resistance to acids.

ultrasonic bonding
joining of plastic by vibratory mechanical pressure at ultrasonic frequencies (18 to 50 kHz).

ultraviolet curing
(1) the process of polymerization; (2) a reaction initiated by the presence of ultraviolet light; (3) the use of ultraviolet radiation to convert a wet coating or ink into a solid film.

ultraviolet drying system
any system that utilizes ultraviolet radiation to effect the drying or curing of an ink, coating, or adhesive.

ultraviolet inhibitor
various additives put onto fiber or on fabrics to reduce the harmful effects of the sun.

ultraviolet light
highly energetic part of the electromagnetic spectrum of rays falling between 200 and 400 nanometers that are shorter than the wavelengths of visible light.

ultraviolet radiation
the range of electromagnetic radiation (200 to 400 nanometers) that is outside the visible spectrum.

ultraviolet stabilizer
a chemical compound or specific type of formulation designed to absorb ultraviolet rays and prevent them from attacking a thermoplastic resin.

µm
symbol for micron.

umber
a brown variety of iron oxide pigment.

unbleached
a light brown paper manufactured with unbleached pulp; kraft paper.

uncoated
a paper without mineral applications or clay coating.

underbase
in textile printing, the first color down on a dark garment, designed to provide an opaque base for subsequent colors.

undercolor removal (UCR)
a technique used to reduce the yellow, magenta, and cyan dot percentages in neutral tones by replacing them with an increased amount of black.

undercutting
unwanted exposure of photosensitive material beyond the limits of the positive image by slanted or reflected light rays; also refer to halation.

underdeveloped
a photographic film developed for less than the recommended time or in an exhausted developer solution.

underexposed
film or emulsion that has been exposed for less than the recommended time, or at full time with a weak light source, or with a light source that is positioned too far away.

underfeeding
the feeding of a cylinder die cutting press on top of the steel rule die.

underglaze
a ceramic finish applied directly on the bisque ware and subsequently covered with a glaze.

underglaze ink
screen printing enamel for ceramic and glass decorating that is combined with a flux to impart color or design to the bisque ware, with the glaze being applied over the enamel and then fired.

underlay
stitches applied prior to other design elements to neutralize fabric or create special design effects.

under-run
a condition where the number of acceptable prints in a production run is less than the number specified by the customer.

undertone
the appearance of an underlying color tone in a thin ink film on white background or when viewed by transmitted light.

undertrapping
condition where the first color printed shows through an overprinted color that is intended to hide it, or where the background color is visible where the colors meet.

Underwriters Laboratory Inc. (US)
an independent testing laboratory that establishes standards for commercial and industrial electric products and their safety.

uniform color scale
a scale where the units of color difference are separated by nearly equal distances.

uniform color space (UCS)
three dimensional space where all pairs of color judged to be equally different are separated by nearly equal distances.

uniform commercial code (UCC)
a set of legal statutes adopted in the United States to provide consistent and uniform laws for conducting business.

uniformity
without variation or fluctuation; consistant color reproduction and quality from print to print.

Universal Copyright Convention
gives protection to authors or originators of text, photographs, or illustrations to prevent use without permission or acknowledgement.

universal product coding (UPC)
a system of marking merchandise in inventory so that prices or articles can be read by electronic data processing equipment; also referred to as bar coding.

universal screen key device
in halftone photography, a device to determine correct screen distances when exposing through a glass screen.

universal trademark
a non-copyrighted mark used in advertising or business.

unsaturation
in a UV curable formulation, a double-bond in a molecule that reacts to free radicals.

unsharp
a negative, positive, or highlight mask made photographically that has less definition than the maximum; an out-of-focus image made to soften abrupt gradations.

unsharp mask
a sharpening process that first blurs the edges then subtracts the image from the blurred areas to yield a image of enhanced sharpness.

unstable film
a photographic or plastic film that is dimensionally affected by environmental influences such as heat and humidity.

unwind
the first section of a web screen printing press, where the substrate is wound off of a roll and fed into the first printing station.

up-and-down press
a press used for cutting very tough stock and/or for embossing.

urethane
a versatile type of plastic material that can be manufactured into a flexible or rigid sheet, a coating, an ink, or adhesive.

US scale system
a method of evaluating camera lens aperture settings. (The system is no longer used, but older lenses have the markings: 1=f4; 2=f5.6; 4=f8; 8=f11; 16=f16; 32=f22; 64=f32; 128=f45 and 256=f64. Thus each lens opening marked in either system gives twice the exposure of the preceding lens opening).

UV
acroynm for ultraviolet light.

UV ink
a screen printable ink that contains an activator that causes polymerization under exposure to a ultraviolet light source.

UV resistance
to counteract fading under direct sunlight or other UV light source.

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