Fine Print Knowledge Center
The online guide to print and design.
- Usenet
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A bulletin board system that is accessed through the internet that provides access to more than 14,000 newsgroups which includes every interest group imaginable.
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- User Datagram Protocol
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UDP
The TCP/IP protocol that allows packets of data, or datagrams, to be sent from one Internet application to another. UDP is a “connectionless” protocol, because, unlike TCP, it does not require the sender and receiver to establish a connection before data is transmitted.
It’’s considered “unreliable,” because it doesn’‘t guarantee that datagrams will arrive in the same order they were sent, or even that they will arrive at all.
If reliability is desired, it’’s up to the application using UDP to provide it.
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- User-Agent
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A software program that helps a client or server application perform specific jobs, or seek out information, etc.
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- UV
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Ultraviolet
The part of the spectrum where the wavelenght of light is shorter than the wavelength of visible light.
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- UV Coating
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Ultraviolet Coating
UV Coating Coating systems based on unsaturated polyesters or polyacrylates, or a combination of the two, in which ultra-violet light triggers the drying process. This high-energy light breaks chemical bonds in the coating material’s molecules, which then link up to form long, highly-branched chains, causing the material to solidify.
The drying process takes only seconds, which means that UV coatings can be worked quickly. These coatings contain no volatile substances, making the layer thickness of the liquid and dry coating similar. UV coatings can be applied inline in very high layer thicknesses (up to 8 mm), have excellent gloss and can be barely distinguished from laminated products (film-lamination), though they do emit a odor.
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- UV Ink
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Ultraviolet Ink
Printing inks cured with ultraviolet light.
These inks contain no volatile substances, but instead, in addition to color pigments, individual molecules and short molecular chains that can link to form polymers and so-called photo-initiators.
The latter decompose when exposed to UV light and form highly reactive fragments.
These radicals trigger a polymerization process in which stable, three-dimensional network structures are formed. UV inks are primarily used to print non-absorbent materials, such as metal (sheet metal) and plastic, but also high-quality paper boards and labels.
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- UV Invisible Fluorescent Ink
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Ultraviolet Invisible Fluorescent Ink
UV invisible fluorescent ink is transparent white or colorless and can only be detected under ultra violet light.
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