The choice of substrate is the key
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Pre-coated photosensitive lithography (also known as PS version) has been applied since the 1950s. With its high resolution, smooth dot and high printing durability, it has gradually replaced the plate of protein and multi-layer metal plates, becoming a modern fast printing. New plate. At present, under normal circumstances, the printing durability of the PS version is generally around 100,000 impressions, and the baking resistance of the PS version can be increased by 3-5 times to reach 300,000 to 500,000 impressions, but now many manufacturers reflect PS. The printing capacity of the printing plate is not high, generally only 21,000 30,000 printing, even after printing a few thousand, it will start to lose the version. Here, I only discuss and analyze the plate production and plate making process of the PS version of the printing force according to the personal experience and the PS version production process.
First, the choice of plate
The base of the PS version is aluminum. The aluminum material used in the PS plate belongs to the general industrial grade pure aluminum, the thickness is generally 0.3mm, and the content is 99.5%. The main impurities are iron and silicon, followed by copper, magnesium, zinc, manganese, titanium and the like. The presence of a small amount of impurities in the aluminum plate can increase the tensile strength and hardness of pure aluminum, reduce the elongation, and reduce the electrical conductivity of aluminum.
Second, the composition and coating of the sensitizer
The photosensitive agent for PS plate is composed of a photosensitive material, a film-forming polymer resin, a dye, and an organic solvent. For a photosensitive layer coated with a photosensitizer alone to form a sensitizer, the alkali resistance is strong, the film forming property is poor, and development is difficult; and an appropriate amount of phenol resin is added to the photosensitizer. Although the alkali resistance is poor, the film forming property and the adsorptivity are improved. The ratio of the two is 0.5:1 or 0.62:1. If the photosensitizer is small, the film forming resin is more, the alkali resistance is lowered, and the dot is easily lost. The residual film rate is low, which directly reduces the printing durability of the printing plate.