Conventional offset, good quality, Planográfico proces
It is the main printing process since the second half of the 20th century, ensuring good quality for medium and large print runs and just about any type of paper and some types of plastic (especially polystyrene). Planográfico process, originating in lithography, he makes an indirect impression: there is an intermediate element between the matrix and the paper, which is called a blanket. The image that is in the array (which is metal and is simply called plate) is transferred to a cylinder covered with rubber (blanket) and, hence, to the role. In short: the matrix print blanket, prints the paper. The offset term comes from litographyque offset expression, literally, means lithography out-of-place, mentioning just will indirect printing (lithography, printing was direct, with paper having contact with the matrix).
In the second half of the 1990s, the offset now has a fundamental improvement: machines equipped with CTP systems (computer-to-press), which allow the entry of digital data files directly to the printer, where the recording is made of plates and dispensing Photolithography. Although not appropriate, this process mode has been called digital offset.
[...] The sheetfed midsize also allow a good impression, but require more attention and intervention of the printer and have lower speed. As it is very common for them to have only one or two castles, it is possible that, in jobs that require more than one color, it is necessary for the printing process to take more than one step, it is necessary to wash them for entry a new paint. This means the need for multiple adjustments during the printing process, may lead to greater expenditure of paper and time and registry errors. [...]
[...] In the same form of production, the appearance of the plate may vary as degree of sensitivity, the chemicals used and the printer model to which it is intended. Thus, the plates have different colors: some are gray, bluish other, other greenish or yellowish etc. These stains, however, have nothing to do with the color that will be obtained in print, but only with its technical specifications. The color printing is determined solely by the ink used, and not by the plate or by photolithography. Recording photogravure. It is the most widely used form, as the direct-to-plate is recent (second half of the 1990s) and still expensive. [...]
[...] That is, when the sensitization is carried out, the light "softens" the emulsion was exposed to light. During development, these areas become hydrophilic (ie come to attract moisture), while the areas which were not exposed (that is, those areas that have images to be printed) "harden" and become lipophilic (attract fat). Therefore, these surfaces with the emulsion "hard" attract ink while printing DTP / Direct-to-plate (direct-on-plate) Direct-to-plate or direct-on-plate is as it became known digital platemaking, available today in some great graphics and few bureaus. [...]
[...] A job with less than ten thousand copies tends to be postponed in favor of any other that exceed. In sheetfed, an issue of this order would not necessarily be considered small. Rotating can be divided into two major groups: the high quality and newspaper presses Rotating high quality As the name suggests, offer print quality equal to or higher than the flat and accept frontline roles, such as coated, for example. There, work that could be done in sheetfed becomes cheaper due to the high circulation and the shortest time for production. [...]
[...] Posters, folders, books, brochures, etc. are made in flat machine - the most common in the graphic. But there is one exception, which are rotary high quality, available only in very large graphic and very used for magazines of high circulation. There are on the market many different types of printing presses Flat machines Are the most frequently used by designers and more commonly found in the graphic because they require smaller facilities and cost far less than the rotary. [...]
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