3. Irregular printing on one side of the paper is not allowed
One-sided irregular irregular overprinting refers to the improper overprinting on one side of the longitudinal crosshair operation surface or transmission surface. The crosshairs that are not properly overprinted are sometimes in the trailing direction of the standard line and sometimes in the direction of the mouth of the standard line. There are two common reasons.
(1) Paper skew
In some machines, the feeder components, such as separation heads and paper pressing balls, are worn or poorly adjusted, which often causes paper skew. When the paper reaches the front gauge, the speed is different. This kind of paper feeding condition may cause irregular irregular printing on one side. If this happens, it means that several parts of the paper machine may have problems at the same time, and they should be checked and solved one by one.
Solution: Turn on the rotary handle of the air pump to rotate the paper feeder. Starting from the suction nozzle, check whether the blower presser foot and paper feed nozzle are coordinated properly. If a problem is found, it should be resolved in time, and then check whether the elevation angle of the front stopper is normal, whether the pressure of the two paper feed wheels is the same, and whether the pressing time is the same. Sometimes the shaft of the paper feed roller is worn seriously or the paper feed roller is not round, it should be replaced. Then check whether the four belts are tight and the belt pulleys are flexible. Some operators put paper strips on the paperboard. These paper strips will affect normal paper feeding if they are arched or worn, and should be replaced. On the new type of separation head, there is a mechanism to adjust the paper skew; the old type separation head uses the change of the angle of the paper pressing frame, that is, changing the angle of the paper pressing roller and the paper belt to remedy, so that the processing can generally overcome the paper skew failure .
(2) Simultaneous failure of regulatory components
The following are three examples for analysis: â‘ The front gauge has a low blocking tongue, and it is difficult for the paper to enter the front gauge. Some operators will increase the pressure of the flat brush wheel, or even press the trailing paper ball on the edge of the paper intentionally, resulting in the phenomenon that the paper does not go in place and passes in place. â‘¡ The gripping force of the swing gripper is insufficient, and the paper is pulled out. Some operators treat it as an overprint failure caused by a single side of the paper not being in place, and increase the pressure of the brush wheel or reduce the paper positioning time. â‘¢ The side gauge is raised too slowly and the paper is pulled out from the swinging teeth, which is easy to handle as a fault caused by the overprinting caused by the paper not going on one side. As a result, the fault was not resolved, but caused irregular unilateral overprinting.
Solution: If one-sided irregular overprinting is inaccurate, first of all, ensure that the paper is fed properly, and handle the pressure of the brush wheel, the trailing brush, and the trailing ball. Then, check whether the paper feed positioning time meets the requirements. If it does not meet the requirements, adjust the accuracy first, and then check the regulatory parts one by one.
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