On the composition of film negatives

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Film is film now generally refers to film, and can also refer to the negative in the printing plate. The basic components of the film are: (1) used as a photosensitive drug film (also known as "emulsion"); and used as a support film (2) Film base.

The PS version is an aluminum version for printing. Specifically, the film is printed on the PS version!

"PS version" is the abbreviation of "Presensitized Plate" from English, and the Chinese meaning is pre-coated photosensitive plate. It was first developed by American 3M company (Minisota Mining & Manufacturing Company) in 1950. PS version is divided into "photopolymerization type" and "photolysis Two types are available. The photopolymerization type uses the negative version of the original printing plate. The diazo photosensitive film of the graphic part is hardened by the light, and it is left on the plate. The diazo photosensitive film of the non-graphic part does not see the light and does not harden. The developer is dissolved and removed. The photo-decomposition type is printed with the positive image of the original plate. The diazo compound in the non-graphic part is decomposed by light, and is dissolved and removed by the developer. The oleophilic part is a diazo photosensitive resin with a high publishing base plane of about 3μm, which is a good oleophilic hydrophobic film, the ink is easy to spread on, but the water is difficult to spread on. The diazo photosensitive resin also has good resistance Abrasion and acid resistance. If baked at 230 ～ 240 ℃ for 5 ～ 8min to enamelize the photosensitive film, the hardness of the printing plate can also be improved, and the printing durability of the printing plate can reach 200,000 to 300,000 sheets. The hydrophilic part of the version is an aluminum oxide film, high The publishing base plane is about 0.2 ～ 1μm, and the hydrophilicity, abrasion resistance and chemical stability are relatively good, so the printing plate has a high printing durability. The PS version has fine mesh and high resolution, resulting in dots It is clean and complete, so the color reproduction is good, and the image clarity is high; the blank part of the PS version has a higher moisture content, the printing plate consumes a large amount of water, and the water and ink balance is easy to control.

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