Trucos de diseño para diseñar como locos
One of the most common printing systems due to its versatility, quality and definition is gravure. Although less used than its competitors, offset printing or flexo, gravure printing is ideal for packaging of all kinds, large circulation magazines and books. This post explains briefly what it is.
In gravure or rotogravure printing, each of the plates is stamped with depressions, or celos, that store the ink, which is very fluid and transmit it to the printing surface (paper, plastic, cardboard, cellophane, aluminum, etc… ) These depressions are of three types: same width – different depths, as deep – varying width and, finally,different widths – different depths. One of the differences with offset printing is that the plate is recorded directly on the printing cylinder by a diamond head or more recently by a laser. This cylinder is made of iron, steel or aluminum which is then covered with a copper film on which depressions are recorded. To conclude this process the printing cylinder is subjected to treatment with chromium to prolong its life.The depressions or cells can assume almost any shape but the most common are square, diamond or oval. In the picture below you can see the different possible types of depression.
The plate cylinder can reach much larger dimensions than offset printing and flexography cylinders. You can print endless motives. One of his best qualities is, without doubt, its ability to maintain quality and definition of long print runs.
The printer roller receives the ink dipping into an ink recipent, being retained in the depressions, the excess ink is swept so that the rest of the plate is cleaned, this process and the abrasion caused by the chemical components of the inks are the main reasons why the cylinder wear.
The amount of ink applied to the printable surface is determined by the width and depth of the depressions made on the plate. A pressure cylinder helps the transfer of ink on the support. Subsequently the support is passed for a drying tunnel.
As in offset printing there is a body for each of the colors to be printed. The rotogravure printing system can support up to nine bodies.
The major drawback of this printing system is the high cost of recording cylinders. Besides the printing units are much easier and cheaper to maintain.