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2. Remedy 1 Use an electrostatic eliminator to eliminate the static eliminators used on the printing presses, such as induction static eliminators, high-frequency high-voltage static eliminators, and high-frequency high-voltage static eliminators, etc., which should be placed near the drum when installed.
2Improve the relative humidity of the printing shop. The generation of static electricity is related to the relative humidity of the operating environment. When the relative humidity of the workshop is lower than 40%, electrostatic problems are likely to occur. Therefore, when printing, sprinkle some water around the paper stack and the machine, or use air to humidify. Adjusts the relative humidity in the printing shop to avoid static electricity.
3 Humidifying the paper When the moisture content of the paper is low, the paper is susceptible to static electricity. When the paper is charged with static electricity, it is necessary to hang the paper or place the paper stack in a relatively humid environment for a period of time. However, care must be taken to prevent the occurrence of paper ruffles.
4 Reduce the speed of the printing press When the static electricity is severe, reduce the friction between the paper and the paper, the paper and the machine by reducing the speed of the printing press, thereby reducing the generation of electrostatic charge.
Second, the printer improper adjustment caused by paper failure printing paper through the feeder, the paper transfer station, and then through the former rules, examples of position, and finally by the rubber roller and the impression roller rolling and printing. In these links, improper adjustment of one part of the machine will affect the operation of the paper and cause printing failures. Therefore, the following machine parts must be adjusted.
1. The suction nozzle, the blowing nozzle, and the pressure lever are not uniform in the size of the paper blowing nozzle, or the suction position of the suction nozzle is improper, resulting in that the paper cannot be separated to form double sheets or multiple sheets; the suction nozzle is inhaling too much, causing the paper to double Zhang, Zhang Zhang, too small to form an empty Zhang.
Remedy: Adjust the amount of air and inspiratory volume through the two air valves on the air pump until it is suitable; adjust the position of the nozzle to the right.
2. When the pickup belt and the paper feed belt do not match each other, the speed of each transport belt is inconsistent. As a result, the paper skews. When the pressure roller is not positioned properly or the rotation is not flexible, the paper feed is skewed, or the paper is skewed. The paper-feeding table cannot be stretched naturally, and the paper arches unevenly. After rolling, the printed product is wrinkled.
Remedy: Adjust the axis of the conveyor belt under the control of the feeding table so that all the feeder belts are loosely connected. Check whether the axles are worn and the pressure is uniform. Fill the oil regularly.
3. Side guide Pull the paper through the front gauge and the gauge to pull the paper to the side fence to complete positioning. When the tensile force of the side gauge is too large, the paper arches under the resistance of the side gimbal baffle. After the embossing, the printed product forms an inverted arc-shaped fold.
Remedy: Adjust the side gauge to normal.
4. When the impression cylinder bite prints, when the impression force of the impression cylinder is inconsistent, arching will occur at the mouth of the paper. After imprinting, the printed product forms a circular fold in the mouthpiece; or the paper corner is just half bitten by the impression cylinder and causes the paper edge to be subjected to excessive force. After the printing, a fold is formed at the edge of the paper.
Remedy: Check the teeth and the toothpaste, if there is wear, need to be replaced; adjust the teeth force to make it uniform; check the bite bite paper position is appropriate.
The relationship between printing quality and paper is very large. As a printing job, we must fully understand this point, continuously accumulate experience, and take corresponding countermeasures, so as to improve the quality of printed matter and reduce the scrap rate caused by paper factors.
(c) Paper electrostatic factors Causes and hazards In the printing process, the paper on the stack is separated and transported forward by the friction between the transfer belt and the platen. Between paper and paper, paper and machine are always in friction. Friction produces charge. When the charge is gathered, the paper is charged. When the paper has the same kind of polar charge, the papers are mutually exclusive, resulting in inaccurate overprinting during printing and a misfeeding of the paper; when the paper has a heterogeneous charge, it causes empty sheets, double sheets, and multiple sheets when the paper is fed. Improper overprinting and other problems; paper surface with static electricity is also easy to absorb some paper hair and dust, resulting in prints appear flowers or spots and other defects, so the elimination of paper static electricity is very important.