The structure of the plate is composed of aluminum base, photosensitive resin layer and silicone rubber layer. During exposure, the silicone rubber layer that is exposed to light reacts, the silicone rubber layer is removed by the developer, and the portion that is not exposed to light forms a blank portion of the printing plate, forming a negative plate.
The graphic part of the negative type non-horizontal version is slightly concave, and the ink is not easy to diffuse after the ink is applied. The silicone rubber layer in the blank part has a repelling effect on the ink. Therefore, we can use no wetting liquid during printing, thus avoiding the cause of the wetting liquid Many failures. The ink used in waterless offset printing is lower in viscosity and adhesion than water-based offset printing inks. The main components are high-viscosity modified phenolic resins and high-boiling non-aromatic solvents, which are easily decomposed when heated. Keep fit.
Waterless offset printing, the dot increase value is small, the dot increase value can be controlled within 3%, 200 to 500 lines / in fine screen line can be used, and high resolution image prints can be printed. If combined with FM screening technology, unparalleled high-end and exquisite printed matter can be printed. Waterless offset printing removes water that is difficult to control, no ink emulsification, and the ink color of the printed product is uniform and highly saturated. When printing with waterless offset printing, generally 5 sheets of paper can be used for official printing, with low paper consumption rate and high production efficiency. Waterless offset printing, as an advanced printing technology, may replace traditional waterborne offset printing.
Since waterless printing does not use fountain solution, there is no emulsification of the ink. However, due to the lack of moisturizing water to repair and clean the printing surface during printing, the printing surface is prone to smearing. For this reason, the printing pressure of waterless printing should be lower than that of PS printing.
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