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When users select a computer-to-plate system, they rarely mention the plates and their development process. This is surprising. According to Mr. Gary Wall, general manager of IGP Co., Ltd., a supplier of ctp plate developing equipment, “This is a problem that we have to consider. People usually only consider whether the appearance of the tool is good-looking and ignore the technology itself.â€
In the past, different Ctp plates and their development process always had a lot of obvious differences. With the continuous advancement of plate-making machine technology, this situation has also been correspondingly alleviated, and the common features on the plate have become more and more.
In fact, every company that installs a ctp system (either thermal or visible light) claims that the quality of overprinting has improved greatly since the use of cleaner plates. In addition, since the filmmaking process does not use film, it solves the bottleneck problem of slow plate making speed, greatly improves production efficiency, and greatly reduces waste.
So far, the main differences between the various ctp systems still revolve around the type of plate used and its development process. It is true that all metal plates, whether thermal plates or visible plates, use the same aluminum plate as a substrate, but the methods of graining and anodizing on the surface of the aluminum plate vary from manufacturer to manufacturer.
However, the main difference between various printing plates is the type of laser energy, heat source, or light source used to activate the reaction when the thin emulsion coating on the aluminum plate is exposed. Since the laser can only emit energy at a fixed wavelength, the emulsion layer properties of the imaging plate need to be adjusted to match the wavelength of the specific energy emitted by the laser. Therefore, a specific plate coating material formula is required for each type of laser to ensure that the plate reaches a reaction peak in the corresponding wavelength region of the laser.
Ablation layer For so-called "visible" printing plates, the coating is made of a photopolymer or silver salt material with photosensitivity, while the thermal plate coating is made of a temperature-sensitive photopolymer or ablation layer. composition. Each has its own advantages and disadvantages in terms of image quality, exposure speed, exposure, and development processes.
First consider the imaging quality. The thermal plate is sensitive to infrared lasers between 800 and 850 nm. The dual nature of the coating means that images can only be recorded when the energy amplitude and phase changes have reached a certain level. That is, the plate area that does not reach the target temperature will not react and will not be exposed. As a result, clean, sharp-edged dots can be created that can be used to make fine screen lines. In addition, the printing plate can be baked, suitable for long-run printing or UV ink printing production.
However, the heat-sensitive coating requires a higher amount of energy to react than a silver salt or slightly less sensitive photopolymer material.
The sensitivity of the thermal plate is similar to that of a traditional plate, allowing rapid imaging of relatively low energy lasers. In general, they can obtain higher dot resolution, and photopolymer emulsions require more than 100 times more laser energy. (To be continued)
Ctp is the long-term choice (a)
The choice of plate has a direct impact on any ctp process. Therefore, when choosing a thermal, violet or visible light plate, choose carefully.