Printing Glossary - Letter U

Unbleached is A Paper that has not been treated with bleaching. This paper has a light brown hue. It concerns the properties or grades of the paper stock.

Uncoated: A Paper that has not been coated. It concerns the properties or grades of the paper stock.

Under-color Removal can be defined as used in the process of color web printing to reduce the cost of ink and to improve trapping. Here, the color of color separation films is reduced in areas where the three colors overprint or when the black film becomes increased in these areas. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.

In print practice, under-run means When an order made or delivered is less than the quantity that was specified by the customer, it is referred to as an under-run. In trade practice, allowance for under-runs is permitted. It is a standard concept in printing. Usage varies with process and material.

In print practice, under-trimmed means When a paper is trimmed to a size that is smaller than the trim size specified. It concerns the properties or grades of the paper stock.

Uniformity means When the structure of the paper, its color, and the finish is uniform, uniformity is said to be achieved. It concerns the properties or grades of the paper stock.

Unit refers to The combination of plate, inking, and impression operations to print each color. A 4-color press has four printing units, which have their plate, ink, and impression functions. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.

In print practice, uv means Process of drying process color inks by the means of Ultra Violet radiations. It is done on high-speed multicolor offsets presses. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.

UV Curing refers to Drying UV inks with light reaction instead of drying with heat or oxidation. It affects drying, adhesion, and print appearance.

UV Inks describes Refers to solvent-less inks that are cured by the use of UV radiation in the printing process. UV inks are used in narrow web letterpress presses, screen printing, and flexographic printing. It affects drying, adhesion, and print appearance. Formulation choices influence drying time and rub resistance.