As a transfer medium for imprinting, blankets have a huge impact on the quality of offset products. Correct use of the rubber cloth plays an important role in increasing the service life of the rubber and ensuring the printing quality of the product.
1. The blanket must be washed frequently to keep its surface clean
The principle of offset printing clearly shows: whether the blanket can completely transfer the graphic ink layer on the printing plate and transfer it evenly to the paper surface. The flatness and elasticity of Chen should be better. Keep the surface of the blanket clean and tight Want. We know that during the high-speed printing process, due to the adhesion of the blanket and the "separation work" effect when the ink layer is broken, the surface of the blanket will inevitably gradually accumulate impurities such as paper dust, fillers and pigments. When the printing surface is poor in strength, the filler is too much and the paper is not strong, or the ink is printed with coarse particles and large specific pigments and the viscosity is not suitable, it will cause accumulation of impurities on the surface of the blanket, which affects normal wetting Influencing the transfer of the ink layer, resulting in imprinting void ills. Based on this situation, the blanket must be washed frequently during printing to eliminate the accumulation layer on the surface to achieve uniform ink transfer and imprint transfer. Normally, print about 3000 sheets of scrubbing blanket once, but in the actual operation process, it 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, wipe a layer of water on the surface of the blanket with a wiper, and then stop the operation. At this time, take a wipe with a small amount of gasoline in your right hand, scrub the blanket first to dissolve the ink impurities, and then use your left hand to wipe off the dirt and wipe it with a dry wipe. If the accumulation layer on the blanket is thick, if it is not cleaned once, it can be wiped repeatedly with gasoline cloth until the dirt is completely removed, and then wiped clean with a dry cloth. In order to ensure the integrity and clarity of the printed sheets just after printing, it is best to apply a layer of talcum powder after cleaning the blanket to make the residual solvent on the surface dry. In fact, cleaning the blanket is a meticulous job, not only to be clean, but also to be careful to ensure the cleaning effect. The gasoline on the cloth should not be dipped too much at once, so as not to fall on the machine and cause dirt. If the oil is dipped too little, it will not dissolve the ink stains and it is difficult to wash. Therefore, after the dirt on the blanket is cleaned with gasoline, wipe the stain with a dry cloth, and the cleaning effect is better.
Third, the use and maintenance of blankets
Offset printing equipment not only prints fine products, but also general products. It needs to print good-quality coated paper, but also to print offset paper, whiteboard paper, etc. Therefore, using two blankets separately is effective to ensure product quality. New blankets can be used for printing high-end fine products, and old blankets are used for printing general products. If the downtime is a little longer, or every time before work, the blanket must be cleaned. When dry, depending on the degree of fouling, thoroughly scrub the surface of the blanket with pumice powder. If the blanket is not used temporarily, apply a layer of talcum powder after washing, wrap it in black paper and place it in a cool place, and Avoid heavy pressure. To prevent the aging of rubber blanket or deformation under pressure. In order to avoid rolling the rubber sheet out of the dents, the length of the liner paper should be cut one by one to 2 to 3 mm, so that the trailing edge of the liner is stepped, which is also conducive to tightening the inner layer. In order to avoid accidental damage to the rubber blanket, the paper feeder and the operating table must be carefully optimised during printing to prevent the corners, paper balls, and foreign objects from damaging the blanket through the impression cylinder.
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