Modulators in Computer to Plate (CTP) Technology

In the printing, the modulator has become an indispensable important device for transmitting graphic and text information. It was used in early applications such as laser engraving machines, electronic scanning color separation machines, laser imagesetters, and laser printers.
With the development of printing technology, the newly emerging computer-to-plate (CTP) technology, also known as non-film-making, is a high-tech that has been rapidly developed in the 1990s.
It is a digitized graphic message processed by the computer and recorded directly on the plate by laser modulation scanning. Therefore, the plate making equipment is composed of a computer prepress processing system and a laser plate making machine. Dozens of models have been introduced. The principle is almost the same, and computer-controlled laser beam modulation scan plate imaging technology is used.
The electronic computer delivers the processed digitized graphic information to the electro-acoustic transducer of the acousto-optic modulator. At this point, the laser beam is modulated by the acousto-optic modulator, and its first-order diffracted light is directed to the multi-faceted rotating mirror, and then scanned and exposed by the Fθ objective lens on the printing plate to be directly made into an offset printing plate. The plates produced have the advantages of good quality and high speed.
The Laserite 100 FLUV laser direct plate making system consists of a computer, argon ion (Ar+) laser, acousto-optic modulator, multi-faceted rotating mirror, and Fθ objective lens.
The commonly used lasers in the CTPlate computer-to-plate technology are argon ion lasers (488 nm and 514.5 nm), ytterbium-doped yttrium aluminum garnet lasers (1,06 μm), and HeNe lasers (632.8 μm). Among them, air-cooled argon ion lasers are mostly used.
It can be seen that the computer-to-plate technology can omit the intermediate process from the original to the printing plate in the traditional printing. Suitable for light and newspaper printing in fast, low-volume production. Further use in formal printing becomes its future development direction. It plays an important role in promoting the modernization of printing.

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