For now, there are four main types of CTP plates in the market: silver salt type, photopolymerization type, thermal type (thermographic type), and processing-free plate. Below we mainly look at the characteristics and advantages and disadvantages of these types of plates.
Photopolymerization CTP plate
The photopolymerizable CTP plate is mainly composed of three parts: aluminum mesh base, photosensitive layer and protective layer. The photosensitive layer is mainly composed of film-forming resin, sensitizing dye, photoinitiator, monomer or oligomer, stable Agent and other additives. The protective layer is a polyvinyl alcohol oxygen barrier layer, which is mainly used to block the inhibitory effect of oxygen on monomers or oligomers. The imaging principle is that after the plate is scanned by the laser light source, the sensitizing dye in the photosensitive layer of the light-seeking portion first absorbs the photon energy to become an excited state, and then transfers the energy to the photoinitiator, which decomposes to form free radicals, free The base initiates the polymerization of the monomer or oligomer and solidifies, forming a graphic part. The part where no light is seen is removed by development to form a blank part. It should be noted that before development, the protective layer of the unexposed part should be washed away, and then the high-sensitivity polymer layer should be dissolved with an alkaline developer. After the development, the protective layer should be completely removed with a brush. Finally, rinse the layout with a synthetic resin solution. The synthetic resin not only improves the hydrophilicity of the blank part, but also enhances the lipophilicity of the graphic part. It can be printed after drying.
Characteristics of photopolymerization CTP plate
(1) The photosensitive layer of the photopolymerizable CTP plate is very thin, the graphic part and the blank part are basically on the same plane, which belongs to the traditional offset printing type, and has a high sensitivity and fast plate making speed.
(2) The developing solution used for the photopolymerizable CTP plate is alkaline, and the film-forming resin and monomer or oligomer in the photosensitive layer have a certain acidity, which can be dissolved in an alkaline solution and removed by development, and the alkali The contamination of the developer is small, which is beneficial to environmental protection.
(3) The photopolymerizable CTP plate can use different laser light sources such as violet laser diode (410nm), argon ion laser (488nm), FDYAG laser (532nm), infrared laser diode (830nm) And the photopolymerization type CTP plate can be printed with a printing resistance of over 1 million after baking.
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