Ctp Plate Of The Four Main Types And Characteristics Of
CTP technology 80 years since the 20th century there has been an irresistible trend of progress. The CTP Plate CTP technology supplies as the support of the development of the CTP technology has played a key role. Currently, CTP plate can be called a wide range of CTP version of this article introduces the material aspects of knowledge.
I. The main types of CTP plate
For now, the market dominant CTP plate there are three types: silver type, photopolymerization type, Thermal Type (thermal imagery). Here we mainly look at the characteristics of these types of plates and their advantages and disadvantages.
1. Silver halide type CTP plate
Silver-based CTP plates include silver halide diffusion transfer version and the silver and PS version Two types of composite plates.
Mainly by silver diffusion transfer version of the base version, silver salt emulsion layer and the physical development nucleus layer. The transfer by the proliferation of imaging technology, the principle is the exposure of the silver by laser scanning version, containing silver halide solvent Developer solution China, Ag + and silver halide solvent complex spread to the image receiving layer, a catalyst in the physical development of nuclear reduced to metal under the silver deposited on the surfaces of the formation of silver images. Develop after the removal by washing the surface of silver halide emulsion layer, exposing the hydrophilic non-image area and image area of sand present in the sense of fat fluid through the fat with long chain thiol selective adsorption of organic molecules in the deposition of silver surface, so that lipophilic image area. Results of silver deposited ink image to start the exclusion of water, rather than the video portion (no silver deposition) are still excluded ink, and then to the computer To plate Purposes.
Silver version with the PS composite plate mainly by the high sensitivity of silver halide emulsion layer and the wide sense of the scope of the PS plate color composite made of. In the coarsening and anodized aluminum on the order of a feeling of light sensitive polymer coating layer, binding layer and silver halide emulsion layer. The imaging principle is, first of all on the silver layer with a laser light, the resin layer to form graphic images of silver, so that the second exposure can protect the following photosensitive layer is not photosensitive. First Development, will be non-exposed parts of the emulsion layer dissolved, and then the second exposure, the UV light used to expose the entire page. As the graphic from the shelter effect of the layer on the light, so UV light only part of the light of non-graphic type photosensitive resin layer decomposition of the exposure, by the second imaging, the second exposure of the resin layer is dissolved, exposing aluminum version of the base Finally, liquid with solid version of the silver image layer can be a sense of lipid processing.
Silver-based characteristics of CTP Plate (1) silver halide type CTP plate has a high sensitivity, up to 1 ~ 3 J/cm2, the use of low output power, can be small, low intensity laser? Also to achieve high-speed plate output. And silver photosensitive type CTP plate speed is sensitive CTP plate in the fastest plates.
(2) silver halide type CTP plates are wide, red laser, green laser, Violet Systems can be used after their washing methods and the same process with the traditional method, and different manufacturers of the chemical solution CTP plate formula is compatible.
(3) silver halide type CTP plates with high resolution and wide spectral response and dot reproduction and good, the line screens up to 300 lines / inch, network coverage up to 1% to 99% , plate quality, up to 250,000 anti-Indian forces over India, more suited to seal volume and high-quality printing.
(4) As the silver halide type CTP plate with silver as the high cost of raw materials, to a certain extent, increased production costs, and the silver-based CTP plates can not operate in the next room to the preservation of the plate with to some limitations.
2. Photopolymer CTP plate type
Photopolymerization type CTP plate mainly by sand purpose of the aluminum substrate, photosensitive layer and protective layer composed of three parts.
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