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A stereotype mold ("flong") being made Stereotype casting room of the Seattle Daily Times, c. 1900. In printing, a stereotype, [note 1] stereoplate or simply a stereo, is a solid plate of type metal, cast from a papier-mâché or plaster mould taken from the surface of a forme of type.
The plates, called stereotypes, are coated with ink, then pressed against a continuous roll of paper. Rotary letterpress printing was used in the mid-twentieth century to print most major newspapers. In offset lithography, the image is chemically applied to a plate, generally through exposure of photosensitive layers on the plate material.
So the data was imaged at first onto a film and then the film was copied with UV-light onto UV-sensitive offset printing plates. The final stage in the newspaper pre-press phase is preparing the imaged offset printing plates for mounting onto the plate cylinder inside of the offset press. The plates have to be bent and often also punched so ...
In gravure printing, the image is engraved onto a cylinder because, like offset printing and flexography, it uses a rotary printing press. Once a staple of newspaper photo features, the rotogravure process is still used for commercial printing of magazines, postcards, and corrugated (cardboard) and other product packaging.
Section of a platen printing press in use. The platen is the sturdy plate which applies the pressure to the paper and type. A platen (or platten) is a platform with a variety of roles in printing or manufacturing. It can be a flat metal (or earlier, wooden) plate pressed against a medium (such as paper) to cause an impression in letterpress ...
Subsequent improvements in plates, inks, and paper have further refined the technology of its superior production speed and plate durability. In 2003 lithography was described as the primary printing technology used in the U.S.; most often as offset lithography, “responsible for over half of all printing using printing plates”. [27]
Imposition is the arrangement of the printed product’s pages on the printer’s sheet, in order to obtain faster printing, simplify binding and reduce paper waste. [11] Computer to plate (CTP) uses a laser to burn the image from a computer file onto a printing plate. Plates are made of different materials, depending on the needs of the ...
The general form of letterpress printing with a platen press shows the relationship between the forme (the type), the pressure, the ink, and the paper. Letterpress printing is a technique of relief printing for producing many copies by repeated direct impression of an inked, raised surface against individual sheets of paper or a continuous roll ...