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Analysis of newspaper printing electrical experience

in newspaper printing, paper breaking is a headache. Whether it is manual threading or automatic threading, it takes more than 10 minutes to break the paper once. The environmental trend in 2016 may completely eliminate most small and medium-sized paper enterprises. Frequent paper breaks make the operator miserable. Here are some views on the causes of paper breaks

1, edge crack, edge bruise. If it is found in time, deal with it immediately, and this fault is not a big problem

2. The paper roll itself has problems. The paper quality is unqualified or stored improperly, and the center of gravity of the paper roll may shift, resulting in eccentricity. It is generally believed that the paper roll is unqualified if its eccentricity exceeds 5mm, and the eccentricity is easy to cause fracture of 89 high molecular waterproof material sheet. Under normal conditions, the tension and braking force are balanced. When using eccentric paper roll, due to the change of paper roll radius r, the paper is subject to an oscillation with gradually decreasing oscillation period and amplitude. In each short period, the higher the startup speed is, the greater the internal stress of the paper is

3. Abnormal speed change

4. The tension is too large. The paper has tension limit. When increasing the tension, try to stay away from the limit tension. At high speed, a very small change will also produce a very large stress, resulting in paper breakage

5. When the paper feeding must be stopped immediately due to other reasons, the stacker currently breaks the paper tape

6. When the machine is turned on for a long time, ink dirt is deposited on the paper guide roller

for example, the tension of MAN Roland's colorman offset press is controlled by sections. When the machine is turned on for a long time, the deposition of ink scale increases the radius of each roller, thus increasing the tension. In addition, there are many paper guide rollers between the roller and the power roller, and the deposition of ink dirt on them will also increase the tension. When the tension reaches the limit value, the machine beater will break the paper protection

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