Gravure printing plate, the printing part is lower than the blank part, and the degree of depression with the depth of the image layer is the same, the darker the image layer, the deeper the depth, the blank part is in the same plane, printing, full-page coating After the ink, the ink on the plane (that is, the blank portion) is scraped off with a scraping machine so that the ink remains only on the concave printing portion of the layout, and then the substrate with strong ink absorption is placed on the surface of the layout, and the ink is applied to the larger surface. The pressure causes the ink on the printing section of the plate to be transferred to the substrate and the printed matter is obtained as shown in the figure. Due to the difference in the depth of the printed part of the printing surface, the amount of ink in the printing part will not be equal, and the thickness of the ink layer on the printed product will also be inconsistent. The part with more ink will appear darker and the part with less ink will be lighter. The image appears shaded in tone levels.
(1) Features
a recessed printing surface
b Text of the reverse reading
c Direct printing method
d Nets with 45° text and images (important)
(2) Basic printing principle
Ink in the recessed image area, the ink remaining in the non-image area will be scraped off by the rubber sheet, and then the printing paper will be placed on the plate, and the pressure will be increased, and the graphic will be printed on the plate.
(3) The type of gravure
a flat gravure
b Roller gravure
(4) The gravure production process
a Add a layer of photosensitive film on the copper paper
b Put the film on the plate and expose it
c. The non-exposed area is etched away by the etching solution. The non-exposed area becomes a graphic area. The longer the erosion time, the darker the image becomes.