Ghost failure of Mitsubishi 3F offset press

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Ghost trouble of Mitsubishi 3F offset press

the problem of "ghost" is often encountered in the printing process. At this time, the film and printing plate have been made, and the revision is unrealistic. The only way to take is to try to minimize the ghost phenomenon in the printing stage. Next, even electronic products and packaging materials, the article will introduce how to minimize the ghost fault in combination with Mitsubishi 3F offset press

1. Cause

a picture we want to print. Since there is a vertical bar ink block between the two horizontal bar ink blocks, the corresponding circumferential direction of the vertical bar ink block requires a large amount of ink. However, in high-speed printing, if the inking roller cannot be supplemented with enough ink in time, or the ink volume of the horizontal bar corresponding to the vertical bar is less than that of other parts, it is easy to produce the ghost of ink shortage

2. Fault handling

although the following methods can not completely eliminate the ghost, they can reduce it to an almost invisible level

(1) adjust the ink supply system. Since the layout with vertical bars requires a large amount of ink, we can increase the ink volume of the ink key corresponding to the vertical bars and supplement the ink supply of this part as much as possible. However, due to the axial movement of the inking roller, in order to ensure the uniformity of the ink color of the whole horizontal bar, the ink volume should be reduced on both sides of the corresponding part of the vertical bar. This ink amount plus the ink amount from the series movement can basically ensure the uniformity of the horizontal bar ink amount

(2) control the fountain method. Mitsubishi 3F offset press has three ways to moisten the plate. In remote control China, all the problems are interrelated, and the three methods can be switched at any time. When ghosts appear, another form of embellishment is generally used. In this way, since the transfer roller 2 is separated from the inking roller 5 and the inking roller 6, the ink retained on the inking roller 1 cannot be transferred, so these excess ink can be used as a supplement to the ink lacking part on the plate, so as to reduce the ghost. However, this fountain method has the lowest number of revolutions of the bucket roll and the emulsification degree of oil n-constant ink is small

(3) adjust the water supply. We know that the ink water balance is a relative balance in the printing process. 3. Due to the large volume of the double column tensile testing machine, the ink water balance can be achieved between 15% and 26%. When the fountain solution is controlled at the balance of more ink and less water, the ink emulsification value is the smallest. Relatively speaking, in the same amount of transferred ink, the emulsification degree is small, and the ink content in the print is high, so the ink color of the print is saturated and bright, which can weaken the ghost effect to a certain extent

through the joint action of the above three methods, the influence of ghost fault in the printing process can be basically reduced to a small extent, so as to improve the quality of prints. This method is very effective in practical operation, and high-quality products can be printed directly without changing the design and process of prints

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