How to do the maintenance of offset blanket
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As a medium for imprinting, the blanket has a great influence on the quality of the offset product. Proper use of the blanket will play an important role in improving the service life of the rubber and ensuring the printing quality of the product.
First, the blanket must be washed to keep the surface clean
The principle of offset printing clearly shows whether the blanket can completely transfer the ink layer on the printing plate and transfer it evenly onto the paper surface. The flatness and elasticity of Chen Ping are better, keeping the surface of the blanket clean and tight. Want. We know that in the high-speed printing process, due to the adhesiveness of the blanket and the "separation work" when the ink layer breaks, the surface of the blanket will inevitably accumulate impurities such as paper dust, fillers and pigments. When the printing surface is inferior in strength, the filler is often combined with the paper which is not strong; or the printing with the coarse-grained, relatively large pigment and the viscosity is unsuitable, the surface of the blanket is accumulated, which affects the normal wetting, and Affect the transfer of the ink layer, causing the vacancy of the imprint. Based on this situation, the blanket must be washed frequently in the printing to eliminate the accumulation layer on the surface to achieve uniform transfer of ink and transfer of the print. Usually, about 3,000 sheets of blankets are wiped and washed once, but the actual printing process should be controlled according to the printing effect to ensure the stability of printing quality.
Second, master the correct cleaning method of the blanket
For safe operation and easy cleaning, the machine should be rotated at a low speed, and a layer of water should be applied to the surface of the blanket with a cloth and then stopped. At this point, take a piece of tarpaulin on your right hand and rub a small amount of gasoline. First scrub the blanket to dissolve the dirt. Then use your left hand to dry the crepe and wipe off the dirt. If the accumulation layer on the blanket is thick, if it is not cleaned once, it can be wiped repeatedly with a petrol cloth until the dirt is completely removed, and then cleaned with a dry cloth. In order to ensure that the printed image just printed is complete and clear, it is best to apply a layer of talcum powder after the blanket is cleaned so that the solvent remaining on the surface is dried. In fact, cleaning the blanket is a meticulous work, both to be clean and neat, and to be careful to ensure the cleaning effect. The gasoline on the cloth can't be too much at once, so as not to cause dirt when it is squeezed to the machine. If the oil is too small, it will not dissolve the dirt and it will be difficult to clean. Therefore, when the dirty cloth on the blanket is cleaned with gasoline, the dry cloth is used to dry the stain, and the cleaning effect is good.
Third, the use and maintenance of blankets essentials
Offset printing equipment not only prints fine products, but also prints general products. It only needs to print paper with good paper and printing offset paper and white paper. Therefore, the use of two blankets in each case is effective for ensuring product quality. New blankets can be used for high-grade fine products, and old blankets for general products. If the downtime is a little longer, or the blanket must be cleaned before each shift. When dry, depending on the degree of fouling, thoroughly rub the surface of the blanket with pumice powder. For the temporary use of no blanket, after washing, apply a layer of talcum powder, then wrap it in black paper and place it in a cool place. Do not stress. To prevent the blanket from aging or being deformed under pressure. In order to avoid rolling the blanket out of the dent, the length of the liner paper should be cut into 2 to 3 mm one by one, so that the trailing edge of the liner is stepped, which is also advantageous for wrapping the inner layer. In order to avoid accidental crushing of the blanket, the paper feeder and the operating table must be carefully watched in the printing to prevent the folding angle, paper dough and foreign matter from smashing the blanket through the impression cylinder.