8/24/2023 0 Comments Print neat calibration sheet![]() ![]() Occasionally, the feeder (which in those days was a person manually inserting paper into the press) would miss a sheet, and the plate would accidentally transfer the image to the blanket. ![]() At that time, stone-based lithographic presses used a natural rubber blanket wrapped around the impression cylinder (the cylinder providing a hard backing to the paper, allowing a clear, firm impression by the plate), and the stone plate transferred the image directly to the paper. The offset press as we know it today was invented around 1905 by Ira Rubel, a papermill owner in Nutley, New Jersey, who also used the contemporary lithographic stone presses to print bank deposit slips. The remainder of this article will deal primarily with sheetfed offset printing. The two basic varieties of offset lithography are sheetfed and web offset lithography. Other forms of lithography include ["direct lithography (or di-litho) and waterless lithography. A term describing the most common form of lithography (a printing process in which the image area and the non-image area co-exist on the same plane, rather than from raised or etched type, as in letterpress and gravure printing, respectively see Lithography) in which a printed image is transferred first to a rubber blanket, and the blanket then transfers (or "offsets") the image to the paper or other surface. ![]()
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