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Rotary printing press
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This article is part of the series on: |
| Technologies |
| Phaistos Disc (1850–1400 BCE) |
| Woodblock printing (200 CE) |
| Movable type (1040) |
| Printing press (1439) |
| Rotary press (1843) |
| Intaglio (printmaking) |
| Lithography (1796) |
| Chromolithography (1837) |
| Offset press |
| Screen-printing (1907) |
| Flexography |
| Thermal printer |
| Photocopier (1960s) |
| Laser printer (1969) |
| Dot matrix printer (1970) |
| Inkjet printer |
| Dye-sublimation printer |
| Digital press (1993) |
| 3D printing |
A rotary printing press is a printing press in which the images to be printed are curved around a cylinder. Printing can be done on large number of substrates paper, cardboard, plastic. Substrates can be sheet feed or unwound on a continuous roll through the press to be printed and further modified if required (die cut, overprint varnish, embossing). Printing presses that use continous rolls are sometimes referred to as "web presses". Rotary drum printing was invented by Richard March Hoe, and then significantly improved by William Bullock
Specific wallpaper printing machines, using mostly wooden printing cylinders, have been widely used throughout Europe.
Today, there are three main types of rotary presses; offset commonly known as web offset, rotogravure, and flexo (short for flexography). While the three types use cylinders to print, they vary in their method.
Offset lithography uses a chemical process which an image is chemically applied to a plate (generally through exposure of photosensitive layers on the plate material). Litho is based on the fact that water and oil do not mix, which enables the planographic process to work. In the context of a printing plate, a wettable surface (the non-image area) may also be termed hydrophilic and (the image area) a non-wettable surface hydrophobic.
Gravure is a process in which small cells or holes are etched into a copper cylinder which is filled with ink.
Flexography is a relief system in which a raised image is created on a typically polymer based plate.
In stamp collecting, rotary-press-printed stamps are sometimes a different size than stamps printed with a flat plate. This happens because the stamp images are further apart on a rotary press, which makes the individual stamps larger (typically 1/2 mm to 1 mm).