Nature of the Work
Printing machine operators, also known as press operators, prepare, operate, and maintain the printing presses in a pressroom. Duties of printing machine operators vary according to the type of press they operate—offset lithography, gravure, flexography, screen printing, letterpress, and digital. Offset lithography, which transfers an inked impression from a rubber-covered cylinder to paper or other material, is the dominant printing process. With gravure, the recesses on an etched plate or cylinder are inked and pressed to paper. Flexography is a form of rotary printing in which ink is applied to a surface by a flexible rubber printing plate with a raised image area. Use of flexography should increase over the next decade, but letterpress, in which an inked, raised surface is pressed against paper, remains in existence only as specialty printing. In addition to the major printing processes, plateless or nonimpact processes are coming into general use. Plateless processes—including digital, electrostatic, and ink-jet printing—are used for copying, duplicating, and document and specialty printing, usually by quick and in-house printing shops, and increasingly by commercial printers for short-run jobs and variable data printing.