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How to make a high-quality cable and field version on a plate at the same time In general, in the case of a sufficient flexo printing machine, the same color cable and field version should be divided into two production, because the cable version Thinner ink layers are required for printing, while thicker ink layers are required for field and line versions. However, under certain special circumstances, it is necessary to print the same color network lines and field images on the same plate. Under this circumstance, on the one hand, when printing, the choice of anilox roller has to be compromised. Usually, it is a priority to meet the printing requirements of the cable screen version at the expense of the thickness of the ink layer in the field. On the other hand, when making the printing plate, Grasp the different exposure times to ensure the quality of the same plate version of the Internet and field parts. The difference between the image part and the field part of the cable is mainly due to the different depth of corrosion. The cable part needs to have a strong foundation in order to “stand†during the process of brushing the printing plate, so the corrosion depth should be shallower. Different depths of corrosion can be obtained with different back-exposure times by masking local methods. The front exposure time should also be similar, but it is said that the current flexographic plate manufacturer has introduced a new type of flexographic plate. No matter if the printing part is a cable or a field, this type of plate needs only one uniform front exposure. Time avoids the hassle of multiple exposures and makes flexo plate making easier.
Why the rubber ink roller is easy to wear The rubber ink roller is driven by the gear of the anilox roller. There are two functions: one is to mention the ink from the ink plate in the ink transfer system; the other is to use the ink in the ink. "Off, leaving a layer of relatively uniform ink on the anilox roller, but its role is far less than the role of reverse squeegee. Regardless of whether the machine is printing or not, once the ink is filled in the ink tray, the rubber roller and the anilox roller start to rotate. However, once there is no ink or water between the two rollers, ie, in a completely dry condition, rotation of the two rollers under the condition of surface contact should absolutely be avoided. Because although the two roller surfaces are in contact with each other, the linear velocity of the surface is different. The linear speed of the surface of the rubber roller is slightly lower than that of the anilox roller. The lubricant between the two rollers. In the absence of water or ink between the two rollers, if the two rollers come into contact with each other, the hardened skin of the rubber roller will be worn out in a very short time, and the damage will be exacerbated, and the entire rubber roller will be scrapped. Therefore, it should be remembered that rubber rollers and ceramic anilox rollers cannot be "dry-ground."
Use the squeegee should pay attention to the use of the squeegee in the ink transfer system is optional, for coarse printing or UV coating, it is not necessary to use a squeegee, just adjust the rubber roller and With the pressure between the anilox rollers, a substantially uniform ink layer can be obtained. For the printing of general printing products, a squeegee should be used. The pressure between the rubber roller and the anilox roller should be smaller to ensure that there is enough ink to evenly reach the squeegee blade. Only afterwards can a uniform ink layer be obtained. In addition, the screws on the squeegee holder should be carefully adjusted. The screws can change the contact pressure between the squeegee blade and the surface of the anilox roller. If the above method does not work, that is still can not get a smooth and even ink layer, you can check the blade of the squeegee to see if it has physical damage or life, it may also be the screw of the fixed squeegee blade loose, resulting in the blade and net Roller axis is not parallel. Do not scrap the squeegee with small defects. You can run the squeegee on other stencil printers and run it until the defects are worn out. A squeegee can continue to be used even if it rubs off a few millimeters of its width during its life. (Liang Xinyu Witlon (Hong Kong) Limited) ("The Graphic Arts Society Monthly")
What are the requirements for making flexible version on film types?
When the flexographic plate is exposed on the front of the plate making machine, to ensure the quality of the film and the flexographic printing surface, the platemaking machine is equipped with a vacuum pump for vacuum, and the side of the film which is required to be close to the flexographic plate must be rough (brushed). In this way, the presence of air bubbles between the film and the flexo plate can be prevented from affecting the quality of the flexographic printing surface, and the pressure strips used for the flexing plate and the flexographic edge are also provided with an indentation and a lateral air guide. In addition, there are specific requirements for the blackness and transparency of the film.