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Offset printing is a common printing technique in which the inked image is transferred (or "offset") from a plate to a rubber blanket and then to the printing surface. When used in combination with the lithographic process, which is based on the repulsion of oil and water , the offset technique employs a flat ( planographic ) image carrier.
Waterless vs. Conventional Printing Plates Waterless printing is an offset lithographic printing process that eliminates the use of water or the dampening system used in conventional printing. [ 1 ] Unlike traditional printing presses, waterless offset presses do not use a dampening solution to clear the press of ink . [ 2 ]
Most books, indeed all types of high-volume text, are printed using offset lithography. [citation needed] For offset lithography, which depends on photographic processes, flexible aluminum, polyester, mylar or paper printing plates are used instead of stone tablets. Modern printing plates have a brushed or roughened texture and are covered with ...
It is crucial that offset ink resist water-in-ink emulsification (i.e., repel rather than absorb water). It also should withstand degradation by the fountain solution that covers the non-printing areas of the engraved plate. Offset ink needs to be very rich in pigment so that its full color vibrancy is perceptible, even in minute quantity. [2] [3]
When making a multi-color print with a spot color process, every spot color needs its own lithographic film. All the areas of the same spot color are printed using the same film, hence, using the same lithographic plate. The dot gain, hence the screen angle and line frequency, of a spot color vary according to its intended purpose.
An offset transfer moves the image to a printing substrate (typically paper), making the image right-reading again. Offset printing uses a lithographic process which is based on the repulsion of oil and water. The offset process employs a flat (planographic) image carrier (plate) which is mounted on a press cylinder.