rotary press


rotary press
a printing press in which the type or plates to be printed are fastened upon a rotating cylinder and are impressed on a continuous roll of moving paper.
[1925-30]

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Printing press that prints on paper passing between a supporting cylinder and a cylinder containing the printing plates.

In contrast, the flatbed press has a flat printing surface. The rotary press is used mainly in high-speed, web-fed operations in which the press takes paper from a roll, as in newspaper printing. Many of these large presses not only print as many as four colours but also cut and fold and bind in a cover, all in one continuous automatic process. Paper passes through some presses at nearly 20 mph (30 kph); large presses can print up to 60,000 copies of 128 standard-size pages in an hour. See also R. Hoe.

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      printing press that prints on paper passing between a supporting cylinder and a cylinder containing the printing plates. It may be contrasted to the flatbed press (q.v.), which has a flat printing surface. It is primarily used in high-speed, web-fed operations, in which the press takes paper from a roll, as in newspaper printing. Many of these large presses not only print as many as four colours but cut and fold and even bind in a cover—in one continuous automatic process. Paper passes through some presses at nearly 20 miles (30 km) per hour, the speed limited partly by the tensile strength of the paper; large presses can print up to 60,000 copies of 128 standard-size pages in an hour.

      In its simplest form a rotary press consists of two cylinders turning in opposite directions, with the plate cylinder having curved printing plates attached to its surface and the impression cylinder working to press the paper to the inked plates as the paper passes between the cylinders. A simple two-colour rotary press uses two plate cylinders in succession, each bearing a different typeform and each having its own inking system. The same side of the same sheet of paper receives two successive impressions of two different colours as it passes through the press. Printing on both sides of a sheet of paper and printing in three, four, or even five colours can be achieved in a rotary press by using different combinations and successions of plate and impression cylinders. Extremely high rates of production can be achieved in very large, highly automated roll-fed rotary presses. These machines have cylinders with a circumference large enough to accommodate two or more plates, so that with each revolution the cylinder prints two or more copies of the same page. Similar arrangements enable a cylinder to print eight copies of the same page in a single revolution.

      Quality control is extremely important in colour printing, because the various colour impressions received by a page must be in perfect register with each other. This control is achieved in rotary presses by photoelectric cells (photoelectric cell) that selectively pick up guide marks printed in each colour as they go by and that react to any irregularities in the distance between these guide marks. Any error is automatically corrected by modifying either the speed of one group of cylinders or the pressure of the rollers that control the tension of the paper between one cylinder group and the next. See also printing.

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Universalium. 2010.

Look at other dictionaries:

  • rotary press — n. a printing press with curved plates mounted on cylinders that rotate against and print on paper fed either in individual sheets or from a continuous roll or web …   English World dictionary

  • Rotary press — Rotary press. См. Ротационный пресс. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • rotary press — ro′tary press′ n. pri a printing press in which the type or plates to be printed are fastened upon a rotating cylinder and impressed on a continuous roll of moving paper Compare cylinder press • Etymology: 1925–30 …   From formal English to slang

  • rotary press — noun a printing press for printing from a revolving cylinder • Hypernyms: ↑press, ↑printing press …   Useful english dictionary

  • rotary press — noun a printing press that prints from a rotating cylindrical surface on to paper forced against it by another cylinder …   English new terms dictionary

  • rotary press — /roʊtəri ˈprɛs/ (say rohtuhree pres) noun See press1 (def. 33b) …   Australian English dictionary

  • Direct planographic rotary press — Ротационная машина для непосредственного печатания с плоских (металлических) форм на бумаге, ротационная литографская печатная машина …   Краткий толковый словарь по полиграфии

  • Direct rotary press — Ротационная машина для непосредственного печатания с формы на бумаге …   Краткий толковый словарь по полиграфии

  • Flat-bed rotary press — Рулонная плоскопечатная машина …   Краткий толковый словарь по полиграфии

  • Indirect rotary press — Ротационная печатная машина с офсетным цилиндром …   Краткий толковый словарь по полиграфии


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