Trouble analysis and elimination of loading unit
There are two types of common faults in the paper loading unit: one is caused by unqualified raw materials, such as the paper roll is not round and deformed, mainly caused by extrusion during transportation; the tension on both sides of the paper roll is not equal, and the surface of the paper roll is uneven Rope shape is a common problem in the production process, as long as the qualified paper roll is replaced, the fault can be eliminated. The second type of failure is caused by improper operation, such as paper breakage, wrinkles, etc., which are caused by the operator's insufficient understanding of the paper's adaptability. Such faults can generally be eliminated by adjusting the tension controller.
Analysis and troubleshooting of printing unit
1. Common faults in water supply
Failure analysis: Excessive water supply makes the excess water on the printing plate too much, and the emulsification of the ink is accelerated, reflecting that the product is light in color, dull, dots are not full, and the color of the plate is unstable.
Remedy: First, check whether the depth of the bucket roller in the sink meets the requirements. If the depth is too deep, the water supply will increase, otherwise it will decrease. The bucket roller can be adjusted in the sink by the eccentric devices at both ends of the bucket roller The position of the water supply is normal; secondly, check whether the pressure between the plate water roller and the plate cylinder is within the technical requirements. The specific method is to judge the ink inking bar of the plate when the plate cylinder is pressed The size of the pressure, the ink bar is generally between 4 and 7mm, or it can be measured with a 0.15mm thick feeler gauge, and the adjustment can be achieved by adjusting with a force of 2kg.
2. Common faults in the ink supply section
Failure analysis: Ink color instability manifests when the amount of ink on the printed sheet is large and small, extremely unstable, and difficult to control. This is because the gap between the ink rollers is too large, resulting in unstable ink layer on the surface of the ink roller, and the amount of ink supply changes accordingly.
Exclusion method: Adjust the gap between each ink roller, which can be measured with a 0.15mm thick feeler gauge, and the adjustment is based on a force of 2kg. It should be noted that if the pressure adjustment between the ink rollers is too large, the frictional force will increase, and the ends of the ink rollers will heat easily damage the ink rollers; but if the pressure adjustment is too small, the ink supply will be unstable and cannot be printed normally .
3. Common faults in stamping part
Failure analysis: If the pressure is too low, the ink transfer is insufficient, the product imprint is false, the dots are not full, the handwriting is missing, and the picture is not clear; too much pressure will reduce the printing plate's durability, and the handwriting, picture and text Deformation increases the machine load.
Removal method: The method of changing the thickness of the blanket can be used, but under special circumstances, this method can not eliminate the fault or it is not ideal and incomplete. At this time, it is necessary to adjust the pressure (gap) between the rollers. Note that you must refer to the random manual and mechanical schematic diagram, consult accurate technical data, and use special tools to adjust to make the pressure reach the technical index.
Failure analysis and elimination of folding unit
Failure analysis: The folding is not allowed, the specifications of the signatures do not meet the quality requirements, and the faults such as page falling, rotten pages, and paper jams occur. The wear of mechanical parts exceeds the technical requirements, the mechanical parts are damaged, and the moving parts are not adjusted properly, etc. will cause the above failures.
Remedy: First of all, observe the product carefully, because the faults can be expressed on the product. As long as you have an accurate understanding of the performance, function, and movement of each mechanical component, you can judge the specific location of the fault by observing the product; after determining the cause of the fault, you can check the corresponding component; by listening, touching, It seems that judging, watching carefully, and discovering problems. When the machine parts are damaged, the sound of movement will be unstable and the moving parts often have heat. The wear of the moving parts will result in the movement of the moving parts. These problems can be eliminated by replacing the parts.
After a fault occurs, you must have an accurate understanding and judgment of the resulting fault. Because the cause of the same fault may be different, the method of elimination is also different, and sometimes different faults can also be eliminated by the same method. Therefore, in actual work, it should be applied flexibly and not rigidly.
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