Using offset printing blanket to repair damage
During the offset printing process, due to improper adjustment of the conveying part or careless operation, it is often easy to have thicker small paper pieces, hard fiber clumps in the paper, and multiple sheets of paper into the roller, so that the roller blanket is partially concave Sagging, because the printing pressure is insufficient in the low-concave area, the picture and text cannot be transferred completely, and it can be remedied in the following way.
(1) Adopting the method of padding on the back of the blanket. In order to prevent the low concave parts from being seen clearly after dismantling the blanket, you should first draw a corresponding size mark with a ballpoint pen on the low concave part of the front of the blanket. After removing the blanket, find the corresponding size on the back according to the mark just drawn. Draw marks of equal size. The marks must be accurate. After that, choose a paper with a low degree of depression that is indented with the blanket, tear it or cut it into the shape of the same size as the mark. If the thickness of one piece of paper is not enough, you can use two or three sheets to paste with glue and glue In the low recess on the back of the blanket, install the blanket after the glue has dried.
(2) Remedy cleaning with a rubber cloth is also ideal. It is convenient, fast and practical. Use a brush to dip the rubber cloth to clean the reducing agent and apply it to the low-concave areas of the rubber cloth, which will have an immediate effect.
After using the blanket for a period of time, even if it can still be used normally, let it "rest" for a while. Remove the blanket from the machine, first clean the ink and oil stains on it with detergent or gasoline; then wash it with 50% alkaline solution to saponify the oil that has penetrated the surface of the blanket; then wash it with clean water to remove the saponification Then wipe the talc powder and store it according to the method described above, so that the blanket can restore its original elasticity to a certain extent after a period of "rest" and effectively extend its service life.
Because the blanket has the disadvantages of light aging and heat aging, after purchase, the blanket to be used should be rolled outward, wrapped in black paper, and stored in a ventilated and dry place, and away from light and heat sources, oils, The storage temperature of various chemicals such as acid, alkali and salt is preferably around 20 ℃, and the relative humidity is preferably 70%. The new blanket has a smooth anti-oxidation film, which can be scrubbed off with pumice powder dipped in gasoline to ensure good ink absorption on the blanket surface.
The effective parts of printing need to be kept clean frequently. If it is not clean, it will affect the printing pressure. If ink or other impurities are fixed on the surface of the blanket, the printing pressure will change, which will affect the quality of the printing. Non-printed parts should also be kept clean. If this part is not kept clean, as the sludge and other impurities continue to condense, and the printing pressure continues to increase, the surface of the blanket will be destroyed, making it impossible to use normally.
It should also be noted that keeping the surface of the blanket clean is the junction of the effective parts of the printing, where the ink and other impurities condensed are the most. Due to the increased pressure, the fatigue of the blanket is accelerated, and the blanket in this part is most likely to crack, so it is necessary to prevent impurities from accumulating here.
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