How to apply the most popular ink output informati

2022-09-28
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How to apply the ink output information in the JDF process (Part 1)

after the JDF process is combined into a large version, the corresponding different ink areas provide the ink transfer information to the printing equipment according to the graphic distribution characteristics, so as to shorten the ink control time during printing and reduce the waste of printing time and materials. On the other hand, if the cross-linked thing is used to bind the surface, the printing quality will be better stabilized. However, to make good use of ink preset parameters in actual production, we still need to understand the following links

first, how to control the ink supply in printing

the size of the ink supply is determined by the graphic distribution on the surface of the print. So how to control the amount of ink at the ink bucket roller? It can be seen from Figure 1 that the amount of ink output is related to the ink bucket and the evaluation criteria of these equipment: the gap between the ink bucket rollers. The larger the gap, the greater the amount of ink output. The ink output is also related to the corner of the ink bucket roller. The larger the corner is, the greater the ink output is. Assuming that the ink output is represented by s, the gap between the ink bucket and the ink bucket roller is represented by T, and the angle of the ink bucket is represented by a, then s = a × T。 During normal printing, the ink output s is not allowed to change, that is, the product of a and t is a constant. The reduction of the gap between the ink bucket and the ink bucket roller is limited. The smaller the gap, the more difficult it is to discharge ink. However, if the gap is larger, the impurities in the ink bucket are easy to block the ink discharge, and the increase of the angle of the ink bucket roller is also limited. Therefore, the adjustment principle should be changed to: under the condition of ensuring sufficient ink supply, the gap between the ink bucket and the ink bucket roller should be as small as possible, and the angle of the ink bucket roller should be as large as possible. The ink demand of different printing plates is different, and the ink demand of different positions of the same printing plate is also different, so the ink supply of the ink bucket must be adjustable in the axial direction. This adjustment is mainly achieved by having different gaps between the ink bucket and the ink bucket roller at different positions, that is, S1 = a · T1, S2 = a · T2,... Sn = a · TN. generally, when adjusting, first use a small value of a, that is, a small angle of the ink bucket roller, and then adjust T1, T2... TN well. However, in China's food packaging materials, we can increase the value of a uniformly to achieve the required ink supply

the change of ink layer thickness not only occurs when the ink bucket roller changes the rotation angle and clearance, but also the change of ink volume height of the ink bucket will also affect the change of ink layer thickness. In Figure 2, when the oil ink level continues to decrease from V2 to V3, the field density decreases and the ink color on the printed matter fades. Therefore, in the printing process, with the increase of the number of printing, it is necessary to constantly supplement the ink to maintain a certain height of the ink level in the ink bucket, so as not to affect the ink color of the printed matter. Therefore, the JDF process provides the same ink amount information, but whether to increase a or T needs to be adopted in different ways according to the characteristics of graphic distribution, and we should try to ensure the consistency of the ink volume height of the ink bucket

in the printing process, the ink reaches the printing plate from the ink bucket through the ink transfer roller, ink string roller, ink leveling roller, heavy roller and ink landing roller, and then transfers from the printing plate to the surface of the printing material, going through three journeys: ink feeding, distribution and transfer. In a series of ink transmission and extrusion processes, the ink in adjacent ink areas will expand and affect each other, so the information of ink preset parameters cannot simply correspond the amount of ink required for graphic distribution with the ink area

during the ink feeding stroke, the ink in the ink bucket is sheared by the rotation of the ink bucket roller. Most inks are plastic fluids, which flow only when the shear stress reaches the yield value. The shearing effect of the ink in the ink bucket gradually decreases from near to far from the surface of the ink bucket roller. Therefore, the ink near the surface of the ink bucket roller shears and flows, while the ink away from the surface of the ink bucket roller flows to the ink roller only by gravity

(study and formulate the specification conditions of intelligent manufacturing system solution suppliers to be continued)

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