Gravure printing ink layer thickness and level control
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In gravure printing plates, the printing part is lower than the blank part, and the degree of depression is the same as the level of the image. The darker the image layer, the deeper the depth, the blank part is on the same plane, and the full-face coating is applied during printing. After the ink, the ink on the plane (ie, the blank portion) is scraped off by the squeegee machine, so that the ink remains only on the printed portion of the lower concave surface, and then the substrate with strong ink absorbing force is placed on the plate surface, and a large The pressure is applied to transfer the printed ink on the printing plate to the substrate to obtain the printed matter, as shown in the figure. Because the depth of the printed portion of the printing surface is different, the amount of ink in the printed portion is not equal, and the thickness of the ink layer on the printed product is also inconsistent. The portion of the ink appears to be richer in color, and the portion of the ink is less colored, thereby making it possible to The image appears to have a tone level that varies from shade to shade.
(1) Features
a concave printed surface
b reversed graphic
c direct printing method
d text and image plus 45 ° net (important)
(2) Basic principles
In the recessed image area, the ink remaining in the non-image area will be scraped off by the rubber sheet, and the paper will be placed on the plate to increase the pressure, and the graphic will be printed on the plate.
(3) Type of gravure
a flat gravure
b drum type gravure
(4) The process of making the gravure
a Add a layer of photosensitive film on the copper paper
b put the film on the plate and then expose
c The non-exposed part is etched away by the etchant, and the non-exposed area becomes the graphic area. The longer the etching time, the darker the picture.