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The Heidelberg website glossary explains, in alphabetical order, a multitude of terms relevant to printing, as well as some terms used in Heidelberg's product catalogue.
Simply click on the letter of your choice to access the information you need.
- WAN (wide area network)
- A computer network that spans a larger area. See “LAN”.
- Incorrectly printed pages and other paper generated in print shops such as damaged paper, trial runs when setting up presses, packaging materials and various other print products and book returns.
- Waste paper
- Paper and paperboard disposed of as industrial, commercial and household waste, and sent back to the papermaking company for recycling.
- Water-based coating (dispersion coating)
- Coatings manufactured on the basis of water that dry relatively quickly, are odor-free and do not yellow. Water-based coatings are mainly applied using coating units, though in some cases they are also applied using a press inking unit. The layer thickness of the coating can reach 3 µm. Water-based coatings are not as glossy as UV coatings.
- Designs on sheets of paper created by varying paper thickness. A real watermark occurs when the dandy roll displaces (light watermark) or concentrates (shaded watermark) the pulp mass in the wire section of the paper machine. Facsimile, or impressed, watermarks are made in the paper web after it has left the wire section. Imitation watermarks are added off machine by means of a transparent varnish or embossing process.
- WebDAV (web-based distributed authoring and versioning)
- Draft standard RFC 2518, "HTTP Extensions for Distributed Authoring", produced by the IETF (Internet Engineering Task Force). WebDAV extends the HTTP (Hypertext Transfer Protocol) Internet protocol in such a way that the content of documents can be accessed directly via the Internet to allow a team to work on the content and structure of a document. For example, the WebDAV technique allows partners in the printing and media industry to access a PDF document simultaneously and apply correction instructions to it.
- Wet-on-dry printing
- Multi-color print process, in which the first color is allowed to dry before the next is printed; used for color printing on a single color press.
- Wet-on-wet printing
- Multi-color printing-press, in which subsequent colors are printed before the previous have dried.
- White point
- The brightest neutral area of an image, according to which all other areas are adjusted.
- The intensity of white of a paper stock.
- Wood-free paper
- A somewhat misleading term for paper free of mechanical pulp with a woody fiber content of five percent (by weight) or less.
- The oldest method of producing printing forms. The base material is a block of hard wood. Various cutting tools are used to cut out the parts of a pre-sketched image which are to appear clear or uninked. The parts which remain produce the image. The earliest known woodcuts for reproduction on paper date from the sixth century AD in China. The Buxheim Christopherus of 1423 is the oldest dated woodcut in Europe. It is believed that playing cards were printed using woodcuts in the 14th century in Europe.
- Work and tumble
- A procedure, similar to work and turn, by which a printing plate can be printed on both sides. While after turning, the side guide remains at the same paper edge, the front guides are exchanged, so that the second long side of the sheet is fed in to the front of the press, thus allowing for two lay angles. See "work and turn".
- Work and turn
- The procedure by which a printing plate can be printed on both sides. After one side is printed, the plate is turned and the side guide (pull lay) exchanged, while the front guides remain where they are. See "work and tumble".
- A computer-aided process for organizing work sequences by systematically moving documents from one stage of the operation to the next; requires transport of data and files within a network.
- Workflow management
- Control of work processes in computer networks and those of other functional devices; all activities necessary to run and manage computer and network-based production units within a graphic arts production environment.
- Writing papers
- White or color paper stocks that can either be wood based or wood-free, and that may contain wastepaper and include a surface-sizing treatment.
- Abbreviation for "What you see is what you get", a word processing functionality necessary for working with desktop-publishing systems that allows the user to produce text as it will be printed or displayed.
Glossary in PDF-Format (Acrobat Reader)