Ad
related to: example of offset printing
Search results
Results From The WOW.Com Content Network
Offset printing is a common printing technique in which the inked image is transferred (or "offset") from a plate to a rubber blanket and then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water , the offset technique employs a flat ( planographic ) image carrier.
The problem can occur with most types of printing, and is avoided by the use of slipsheets between copies (so any ink transfer occurs onto discardable paper) or anti-set-off spray powder. The term in offset printing also refers to the unwanted transfer of ink to rollers and friction points throughout the printing press. Ink that is not properly ...
[8] [9] Offset printing or "offset lithography" is an elaboration of lithography in which the ink is transferred from the plate to the paper indirectly by means of a rubber plate or cylinder, rather than by direct contact. This technique keeps the paper dry and allows fully automated high-speed operation.
Offset ink is a specific type of ink used in conjunction with offset printing presses, such as those used to produce letterpress or lithography prints. Such ink must be specially formulated to resist other chemicals it will come in contact with on the printing press.
The letterpress printing process remained virtually unchanged until the 1950s when it was replaced with the more efficient and commercially viable offset printing process. The labor-intensive nature of the typesetting and need to store vast amounts of lead or wooden type resulted in the letterpress printing process falling out of favour.
In intaglio printing, the lines to be printed are cut into a metal (e.g. copper) plate by means either of a cutting tool called a burin, held in the hand – in which case the process is called engraving; or through the corrosive action of acid – in which case the process is known as etching.
Planographic printing means printing from a flat surface, as opposed to a raised surface (as with relief printing) or incised surface (as with intaglio printing). Lithography and offset lithography are planographic processes that rely on the property that water will not mix with oil.
In offset printing, the first sheet costs more than the next 1,000 [citation needed]. Gang-run printing allows multiple jobs to share the setup cost. For example, a 28" x 40" sheet can hold 9 4" x 6" at 5,000 or 18 2,500 postcards (each card takes 4.25" x 6.25" on the sheet to accommodate full bleed. Gang-run printing has been one of the ...