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Offset printing has supplanted letterpress printing in most printing plants; the last letterpress facility for a newspaper was installed in the 1980s. For offset printing, the printing plates are typically prepared by coating them with light-sensitive materials, and creating the image on the plate by direct optical exposure (the photo-offset ...
A stereotype mold ("flong") being made Stereotype casting room of the Seattle Daily Times, c. 1900. In printing, a stereotype, [note 1] stereoplate or simply a stereo, is a solid plate of type metal, cast from a papier-mâché or plaster mould taken from the surface of a forme of type.
The plate's ground side is then dipped into acid, or the acid poured onto it. The acid bites into the surface of the plate where it was exposed. Biting is a printmaking term to describe the acid's etching, or incising, of the image; its duration depends on the acid strength, metal's reactivity, temperature, air pressure and the depth desired. [8]
Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...
The hardness of the plate surface made it possible to print a good number of impressions without the metal of the plate wearing the lines out under the pressure of repeated intaglio printing, which would have happened with unfaced copper. So "A shimmering pale grey became for the first time a possibility in line engraving, and it is this that ...
Flexography (often abbreviated to flexo) is a form of printing process which utilizes a flexible relief plate. It is essentially a modern version of letterpress, evolved with high speed rotary functionality, which can be used for printing on almost any type of substrate, including plastic, metallic films, cellophane, and paper.
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Cycles of pad printing on the plates. From the home position, the sealed ink cup (an inverted cup containing ink) sits over the etched artwork area of the printing plate, covering the image and filling it with ink. The sealed ink cup moves away from the etched artwork area, taking all excess ink and exposing the etched image, which is filled ...
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