The desired pattern is achieved by engraving with a laser or a diamond tool or by chemical etching.
Direct laser engraving of rotogravure cylinder.
For a long time the constraint was the availability of lasers of sufficient intensity and power to directly engrave metallic surfaces at reasonable speeds.
Direct laser engraving the latest technological development is the direct engraving of cylinder surfaces using pulsating lasers.
Like bases preparation methods vary in their ability to address specific printing concerns or desired outcomes as well as the necessities of maintenance down time and other operational aspects unique.
The high quality of the daetwyler direct laser systems dls is demonstrated in the image area through high resolution reproduction and outline free vignettes and in line elements through sharp edged text reproduction and excellent evenness of the ink.
As the substrate is sandwiched between the impression roller and the gravure cylinder the ink is transferred from recessed cells to the substrate by capillary action.
The rotogravure cylinder is immersed in the ink sump and during the process of printing the recessed engraved cells pick up the ink and transfer it to the substrate.
If the cylinder is chemically etched a resist in the form of a negative image is transferred to the cylinder before etching.
Hell gravure systems a heliograph holding company is an innovation leader in the manufacture of prepress engraving systems.
The resist protects the non image areas of the cylinder from the etchant.
The relatively strong laser engraves directly in the cylinder s zinc surface.
Unlike the plates the in round engraved sleeves do not have sewing marks in the print.
Beyond the materials that make up the cylinder another key component of gravure performance is the way cylinders are prepared for engraving.
With its numerous technical solutions hell is continuously redefining international standards in its many core areas of expertise the electromechanical and direct laser engraving of gravure and embossing cylinders and the high resolution direct engraving of.
After etching the resist is stripped off.
Besides the preperation of the steelbase accordi.
