Offset Rubber Blanket （2）
Advantage analysis and application scope of air cushion blanket
Air-cushion blankets can be widely used mainly because they have the ability to help reduce the resilience of paper adhesion and good mesh point reduction. The surface and structure of the air cushion rubber greatly affect its characteristics, so the traditional rubber has been rarely used.
The blanket 50 years ago was made of natural rubber (INDIA-RUBBER), and later it was replaced by synthetic rubber. For example, the standard orange blankets used in the early Heidelberg GTO and KORD printing presses and the third generation are commonly used nowadays. Air-cushioned blanket (coming out around 1960). The first air cushion rubber was "VULKAN714", followed by Perfect Dot. This rubber is still in use today and has become the standard material for most Heidelberg presses. Commonly used blanket brands in Hong Kong include Meiji in Japan, Phoenix in Germany, VULKAN, PRINTEC, Day in the United States and so on.
Advantages of air cushion blanket:
1. The linear speed of the printing plate and the rubber cylinder are better matched;
2. The outlets have a high degree of restoration;
3. Reduce the deformation of the substrate;
Fourth, reduce the friction on the layout (plate off).
Matters needing attention during the use of the rubber blanket
1. Check the flatness of its surface. The way to check is to hit the full plate, but the printing pressure should be lower than the normal pressure. In this way, the unevenness of the surface can be exposed. If the pressure is too large and the ground is thick, it is difficult to see the difference.
2. If the unevenness of the surface is unacceptable (specific indicators can be judged by experience), you can check the uniformity of the surface of the blanket and liner and whether there are foreign objects on the surface of the roller. After removing the foreign matter, if the unevenness still exists, the method of drawing a "map" can be used. First draw each low (or faint) area, and then put a sticker on the back of the blanket (the thickness of the paper is selected according to the situation).
3. During use, if the surface of the blanket is damaged, the solution is the same as 2. However, if the blanket is dampened, the image formed by it will be empty or blank in the middle, and it will continuously transition to the surrounding area to a place that is not crushed. This is one of the most obvious signs of judging that the blanket has been damaged.
4. The surface of the blanket should be acid and oil resistant to prevent its surface layer from being damaged. Regular contact with oil will cause the blanket to age, and finally make its internal organization loose. Regular contact of the blanket with acidic substances will cause corrosion on its surface. It should be cleaned with fast volatile detergents, such as gasoline, instead of slow volatile substances such as kerosene.
5. The creep and stress relaxation of the blanket. After the rubber blanket is stressed for a long time, there are two manifestations: a. If the length is unchanged, the stress gradually decreases, which is the so-called stress relaxation; b if the stress does not change, the length will gradually increase, which is the so-called creep. After the blanket is installed on the roller, the length will not change, which will cause stress relaxation. Therefore, after a period of use, the blanket needs to be re-tightened. If it is not used for a long time, the blanket should be loosened to avoid stress relaxation.
6. The surface of the blanket should be kept clean. The effective part of the printing needs to be kept clean frequently.
If it is not clean, it will affect the printing pressure. When padding the blanket, the paper usually used is about 0.05mm, and there is a significant difference in the reproduction of the imprint between pad and non-pad. From this we can see the effect of this 0.05mm thick paper. In fact, padding of 0.05mm thick paper increases the printing pressure by 0.05mm (generally, the printing pressure is between 0.05-0.25mm). If ink or other impurities are fixed on the surface of the blanket, the printing pressure will change, and the printing pressure will change. Print quality has an impact. The non-printed parts should also be kept clean, because when the blanket of the printed part is damaged, sometimes the latter part of the rubber needs to be borrowed (usually the printing surface will not exceed the entire blanket). 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 damaged and cannot be used normally. Increased printing pressure will also bring other problems, which will be discussed later. The surface of the blanket should be kept clean. One more thing to pay attention to is the junction of the effective parts of the printing, where the most condensed ink and other impurities. Due to the increase in pressure, the fatigue of the blanket is accelerated. In practice, it has been found that the blanket in this part is most prone to cracks. Therefore, it is necessary to prevent impurities from accumulating here.
Installation steps of the blanket
Step 1-When the printer is in the standby safe state and the printing plate has been installed, put the leading end or chuck end of the blanket into the winding rod or locking system rod to fix it.
Step 2-If necessary, insert a gasket at the leading end or chuck end of the blanket and fix it.
Step 3-Turn off the printing press.
Step 4-Press down the inch switch of the printing press and slowly rotate the roller to roll out the blanket and liner.
Step 5-Put the printer in the standby safe state and put the end of the blanket into the winding rod or locking system rod.
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