The paper (or other substrate) is passed between the gravure cylinder and a rubber-coated impression roller, and ink is transferred by a combination of capillary action and the pressing of the substrate into the engraved cells of the cylinder, helped by the rubber surface of the impression roller. letterpress, flexography, gravure, offset lithography, and screen printing. Roller hardness is measured in durometer , and the covering should typically have a hardness between 60 and 95 durometer (for most commercial substrates). GEM offers a wide variety of gravure printing wheels designed for printing on insulated wire, cable, hose, tubing and extruded profiles. ), Ink Fountain. Intaglio was used primarily for illustration matter and playing cards. (Cores that are out-of-round will result in the roll unwinding with a bump, which will cause feeding problems and perhaps web breaks.) On top of the copper, after engraving, is plated a thin layer of chrome, which is applied to protect the etched copper surface from the abrasion of the doctor blade during printing. It accounts for over 60% of the printing market. Basics of Gravure Printing. Gravure Printing Operator . Sheetfed Gravure. The final portion of the press just prior to the printing unit is known as the infeed tension unit, which is little more than two rollers, the nip of which the web passes through to reach the printing unit. New developments in direct computer-to-engraving-head imaging are removing the need for a film positive from which to obtain the information to drive the engraving head. Often, this system is automated, but it still requires careful preparation on the part of the press operator. Gravure substrate & nature of substrate, composition, properties, PPS, roughness, density, opacity, stiffness, surface tension, acidity, moisture contents, pH etc… that affect printing quality. The flexographic and gravure printing processes release hazardous air pollutants (HAPs) through the application of the ink or other materials to the substrate (material to be printed), as well as during the cleaning process, where solvents are used to clean the printing Some substrates (such as those with irregular surfaces) are printed by a process called offset gravure, or indirect gravure, which comprises the standard gravure printing unit, except that the image is first transferred from the gravure cylinder to a rubber-covered transfer roller which first receives the image from the gravure cylinder, then transfers it to the substrate passing between the transfer roller and the impression roller. After print runs, the cylinder needs to be resurfaced. In 1783, British textile printer Thomas Bell patented a rotary intaglio press for use in higher-quality textile printing. equipment/software manufacturer with an expertise in gravure printing, ... pinholes and is probably due improper viscosity adjustments and thus improper transfer form the gravure cells to the substrate. However, the fast-moving consumers’ demands have been pressing on gravure printing just as much. (k) PACKAGING ROTOGRAVURE PRINTING means rotogravure printing upon paper, paper board, metal foil, plastic film, and other substrates, that are, in subsequent operations, formed into packaging products and labels for articles to be sold. That inked image is subsequently transferred (or offset) from the plate to a rubber blanket and then to the printing surface. Sheetfed gravure presses consist of a pile table on which the sheets are stacked, and which are fed into the press, through the printing unit (a standard gravure cylinder-impression roller-doctor blade arrangement, with the cylinder typically inked by a fountain roller), transported by a series of transfer cylinders, over several drying nozzles, and finally to the delivery pile. 2 The invention of the mezzotint (an early means of representing shades of gray in copperplate engraving; "mezzotint" itself literally means, in Italian, "halftone") in the 1600s further refined the use of intaglio for high-quality pictorial reproduction. Types of gravure printing block –plate – cylinder Gravure printing Prof. Dr. Ulrich Moosheimer Seite 14 substrate material ink printing cylinder impression cylinder doctor blade When used on plastic packaging, most gravure presses require the use of fast-drying solvents. Table 6 … (b) Schematic representation of the gravure printing process. The printing plate transfers ink onto the blanket which, in turn, applies the image to the substrate. This nip, regulated by a mechanism similar to a dancing roll, ensures that the web tension beyond it is consistent, regardless of what is happening to the web prior to reaching the nip. The development of stereotype platemaking eventually solved the problem for letterpress printing, and the later use of zinc and aluminum plates eventually solved it for lithography. Gravure is also well-suited for printing on a host of other types of substrates, such as foils, plastics, etc. The invention of photography in the 1820s and 1830s resulted in the search for a means of transferring a photographic image to an intaglio plate. Printing cylinder can be chromium-plated for durability in long runs are the main advantages for gravure..! Metal plate, sometimes with the use of a long central arm, the whole looking! 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