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Conventional offset

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Young W.
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  1. Definition
  2. Production of the plate
  3. DTP / Direct-to-plate (direct-on-plate)
  4. Types of printers
  5. Conclusion

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. [...]


[...] There are other "dangers". The excess of ink charging, previously mentioned, lead to decalcagem: a printed image in a spot adhesive sheet or the back of the next sheet excess ink, which, as noted, is viscous. Excess moisture, in turn, may delay the drying of printed (especially in our climate, which is naturally moist). Remove the graphic material without it being properly dry is decalcagem assurance and, consequently, drawing loss. A good operator and a good graphic monitoring, however, have to avoid these problems Production of the plate Offset plates can be produced by photoengraving, with the use of phototools or for digital recording, known as direct-to-plate. [...]


[...] Conventional offset 1. Definition 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. [...]


[...] Most of the traditional models are Multilith mark. Semi, its resources are restricted. They do not print halftones, and it is recommended that the tablelands areas do not exceed 1 cm2, otherwise occur failures or spots caused by poor distribution of ink. They are suitable for monochromes or at most bicromias very simple because it does not have good records controls. Sheetfed medium and large: Both large printers as midsize are formed by at least three major components, which are the input unit, groups, units or printing modules (castles) and output units, with the result of the work. [...]

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