With this efficient means of laser printing plate production, is the field of prepress and plate making unremitting efforts to the goal. As a high-energy, high-performance recording tool, since the 20th century, 70 years, laser engraving machine to have been offset, gravure plate-making areas are playing an increasingly important role. Information processing in the computer graphics based on the use of laser on the film and offset printing and graphic record of the output is the most common and the most promising method of offset printing plate. The so-called "CTFilm", "CTPlate" in a matter of course includes a laser printed version of record.
As we all know, mechanical electromagnetic electronic gravure engraving machine is the German Haier (HellGmbH) invented by the company in 1962. This is very close to the time the invention of the laser. In fact, the company's technical staff at the time tried to use laser engraving copper rollers, but because of the high reflectivity of copper on the rate of the light failed, they turned into high-energy electron beam engraving of research and success.
Gravure Printing laser records began in 1977, when the company had used the British CrosfieldElectronics laser with a polymer resin layer on the gravure cylinder carved out of network points, making a gravure roller. Although the quality and stability of other reasons, the system did not really put into practical in large numbers, but as a useful technology research and exploration are as laser gravure version of the plate that way you can continue to develop.
May 2000, held in Düsseldorf, Germany Drupa2000 printing event, people see the printed version of the laser recording technology entered the practical stage, in addition to the technology used for flat printing CTPlate become hot outside, several manufacturers have introduced gravure and flexo plate laser plate-making equipment, a CTC (ComputerToCylinder) a bright spot.
Take the profit sharing of electronic technology in laser engraving gravure technology types:
To the type of network points in terms of intaglio, usually there are four types, namely: an area of variable network points, sunken depth of variable network points, size and dent depth can change network points, FM network points. In the current technology level, the four network points have been achieved for laser engraving.
1. Variable area network points
As the name suggests, only by changing the type of network points reproduce the image of its opening area changes in tone level. Larger color depths of the network points, while the color of light at the smaller network points, network points of the dent depth unchanged. This feature is concerned, similar to the principle of image reproduction offset outlets. Therefore, the type of intaglio printing, also known as "network intaglio."
Should be noted that, although the image tone reproduction of the basic principles and offset similar to the structure of its network but can not point out the basic technical requirements Gravure Printing, which is: we must form and retain the net wall, not in the printed edition a large area of non-network field wall. Therefore, in terms of the microstructure of network points, it is not the same level Indian outlets.
2. Dent variable depth of network points
This is the most typical gravure network points, often referred to as "classic gravure" or "traditional intaglio." Only by changing the type of network points of its network points sunken depth of tone reproduction of the image-level changes. Sunken deeper color depths of the network points, while the color of light at the network points sunken shallow hole in the area of the same network. The same size as network points, so the network is equivalent to the thickness of the wall.
3. Dent variable size and depth of network points can be
In the electronic gravure engraving machine electromagnetic carved drum machines often see this network points, which is a non laser-type electric carving intaglio most common type of network points. The network points is characterized by: the color depths of the net open area and sunken hole depth are large, surface color area of shallow open network points and sunken depth is small, obviously the thickness of the wall network is not equal.
4. FM network points
The principles of the FM screening applied to the gravure, and intaglio printing can generate FM network points.
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