III. Bars
Bars are also called ink bars, and the symptoms are relatively simple, that is, prints with a pitch dimension that is perpendicular to the printing direction are equidistant.
The cause of the bar is mainly gear and mechanical vibration. Whether or not the mechanical precision is high or low, whether the gear design is reasonable and whether the gears are properly assembled is the main reason for producing bars.
The solutions to the bar are:
1. Corrected gears: Axial forces are harmful in the drive. They cause the gears to flutter back and forth in the drive. This kind of turbulence can lead to ink bars on the prints and wear on the plate. Because the helix angle is determined by the main drive gear, this parameter must be the same as the version of the roller gear, but the treatment of the manufacturers in the elimination of the impact of the axial force is different, the general practice is The top corner of the gear is chamfered at 45 degrees to remove the front, but a well-known manufacturer's practice is to grind the tooth from the root to the top of the gear on both sides of the gear, grinding the height of the tooth to the height of 1/3-1/ 2 is not equal; the gap of the axial force is freed to avoid the vibration of the gear caused by the axial force generated during the operation of the gear.
2. Misalignment of printing plates The intention of misplacing typesetting is to reduce the runout of the plate rollers due to the reasons for the layout of the plates. Practice has proved that it is difficult to support the bouncing caused by unreasonable layouts because only the two side layers are difficult to handle. We found that when this situation is severe, the runout of the plate roller causes vibration of the anilox roller and causes abnormal wear of the blade. At a speed of 300m/min, an order of 50,000m was printed. After printing, it was found that the scraper using Swedish blue steel was actually worn out with a pronounced wave pattern.
3. Using softer double-sided tape as cushioning is a very practical solution. However, when adopting this method, it is necessary to take into account the pinholes caused by the use of medium-density double-sided adhesives or low-density double-sided adhesives in the field printing. This requires the remedy of the problem of pinholes in the previous section. In order to achieve not only buffer the emergence of the bar, but also to avoid the drawbacks of the pinhole.
Bars are also called ink bars, and the symptoms are relatively simple, that is, prints with a pitch dimension that is perpendicular to the printing direction are equidistant.
The cause of the bar is mainly gear and mechanical vibration. Whether or not the mechanical precision is high or low, whether the gear design is reasonable and whether the gears are properly assembled is the main reason for producing bars.
The solutions to the bar are:
1. Corrected gears: Axial forces are harmful in the drive. They cause the gears to flutter back and forth in the drive. This kind of turbulence can lead to ink bars on the prints and wear on the plate. Because the helix angle is determined by the main drive gear, this parameter must be the same as the version of the roller gear, but the treatment of the manufacturers in the elimination of the impact of the axial force is different, the general practice is The top corner of the gear is chamfered at 45 degrees to remove the front, but a well-known manufacturer's practice is to grind the tooth from the root to the top of the gear on both sides of the gear, grinding the height of the tooth to the height of 1/3-1/ 2 is not equal; the gap of the axial force is freed to avoid the vibration of the gear caused by the axial force generated during the operation of the gear.
2. Misalignment of printing plates The intention of misplacing typesetting is to reduce the runout of the plate rollers due to the reasons for the layout of the plates. Practice has proved that it is difficult to support the bouncing caused by unreasonable layouts because only the two side layers are difficult to handle. We found that when this situation is severe, the runout of the plate roller causes vibration of the anilox roller and causes abnormal wear of the blade. At a speed of 300m/min, an order of 50,000m was printed. After printing, it was found that the scraper using Swedish blue steel was actually worn out with a pronounced wave pattern.
3. Using softer double-sided tape as cushioning is a very practical solution. However, when adopting this method, it is necessary to take into account the pinholes caused by the use of medium-density double-sided adhesives or low-density double-sided adhesives in the field printing. This requires the remedy of the problem of pinholes in the previous section. In order to achieve not only buffer the emergence of the bar, but also to avoid the drawbacks of the pinhole.
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