4. Mottled pattern appears on the surface of the anilox roller Due to the different cleaning intensity of the anilox roller during ultrasonic cleaning, it may cause a mottled pattern on the surface of the anilox roller, that is, a hot spot formed by the sound waves excited by the cleaning liquid on the surface of the anilox cavity. This situation will become more and more serious with increasing abrasion or the gradual saturation of the cleaning solution. Due to the uneven cleaning of the anilox roller surface, the residual ink at the adhesive and the light reflection at the clean place are different. Form a motley pattern. At this time, it is possible to see the mottled pattern on the surface of the anilox roller without using high-end inspection instruments. Once the naked eye can see the mottled surface of the anilox roller, there will definitely be a reflection on the print. 5. Mesh wear When using chrome-plated anilox rollers, wear is a matter of great concern. Because the anilox roller base copper is soft, it is still easy to be worn after chrome plating treatment, and the wear is still relatively fast. Once the chrome plating layer is damaged, the opening of the mesh will become smaller and the mesh wall will become wider, resulting in a sharp decline in the ink transmission capacity of the mesh, that is, the volume of the ink hole of the anilox roller becomes smaller. Because the ceramic material is very hard and dense, the hardness is second only to diamond, so the service life of the ceramic anilox roller is 2 to 5 times that of the chrome-plated roller (refers to normal use and carefully protected, stored, cleaned and managed) . In fact, most of the ceramic anilox rollers that need to be cleaned have suffered other damages before the mesh wall was worn. Perform anilox roll evaluation It can be seen that through careful and careful inspection, you can know when to clean the anilox roller. If there is a problem with the printed matter, you should first find the source of the printing failure on the anilox roller. Most operators often mark anilox rollers that have problems because they know very well which defect of the anilox roller caused printing failures such as stains or dirty lines on the printed product. They sometimes even mark the anilox roller in some way to avoid mistakenly reinstalling it on the printing press. Therefore, in actual work, there is no need for a technician sent by the anilox roll manufacturer to mark which anilox rolls have problems. As long as the operator has basic common sense, uses some simple and practical tools, and after some training and guidance, he devoted himself to work Can do this job well. in conclusion Of course, there are other factors in the flexographic printing process that can cause printing failures, such as the use of printing plates and plate cylinders, the choice and characteristics of inks, and so on. This means that the evaluation of the anilox roller is not the only cure for all diseases. The key is to use assessment as a diagnostic method in a purposeful and flexible manner. The printing workshop is a dynamic environment that may cause damage to the anilox roller at any time. The evaluation performed by the technician of the anilox roll manufacturer is only a hasty check of the existing anilox roll condition at a specific time. Although evaluation by an anilox roll supplier is beneficial, if you really want to improve print quality, reduce unnecessary downtime, reduce the cost of anilox roll cleaning and improve production efficiency, you should carry out the evaluation work in During the entire printing production process, it actively monitors the status of each part of the printing machine on a regular basis. This kind of work is better performed by the printing press operators and auxiliary personnel who are in charge of the printing quality, because they are in the first line of production and deal with these anilox rollers every day. If the anilox roller that has been marked damaged is inadvertently installed on the printing press, it will not only cause printing failure, but also have to pay the waste of time and cost caused by disassembling the anilox roller again. In summary, according to the broad definition of anilox roll evaluation mentioned above, we should no longer call it “anilox roll evaluationâ€, but rather “systematic evaluation and inspectionâ€. If we want to improve and improve the printing quality from the aspect of printing machine operation, the participation and attention of the operator is the basic starting point of the evaluation work. This is truly a perfect solution. Anilox evaluation procedure 1. Thoroughly clean each anilox roller. Carefully place the anilox roller into the journal support on the inspection table. After cleaning the end face of the coel roller, print the serial number and the number of network lines. 2. Check the bearing movement. The bearing seat rotates flexibly, and there should be no swing. 3. Remove the bearing and check the bearing bore with a micrometer. If the bearing bore is severely worn (when it exceeds 0.0005 inches under the printed standard specification) or is scratched, the anilox roller should be sent out for journal repair. 4. Check if there is any burr on the keyway. The burr will hinder the installation of the flat key. If necessary, repair it with a steel file. 5. Check the gear teeth carefully. Burr and wear of gear teeth can cause printing failures, and damaged gears need to be replaced. 6. Carefully inspect the entire surface of the anilox roller and mark the damaged area with a marking label. 7. Set the damaged anilox roller aside for the collar machine to check again. If the damaged area of ​​the anilox roller is outside the normal printing range, it can also be used for individual printing. Even if the damaged area on the surface of the anilox roller is within the printing range, as long as the damaged area is marked, it can still be used in glazing, printing opaque white and glue application devices. 8. Check the damage of the edge of the ceramic anilox roller. Many printers can accept ceramic anilox rollers with slightly damaged edges. If the edge is severely damaged, a filter must be installed to filter out ceramic debris and other impurities in the ink. 9. Record the important data information of each anilox roller in the record book. When you find the same problem on more than one anilox roller, it should be highly valued and marked on the roller for future inspection. 10. When returning the anilox roller to storage, pay attention to whether the environment and conditions for storing the anilox roller are appropriate. Are the mesh rollers too close during storage? Has the surface between the anilox rollers come into contact? Is there enough distance between the gears so as not to touch? Are ink tanks, substrates, printed products and other things placed near the anilox roller? Does the operator get the anilox roller without any effort? If it takes a lot of effort to remove the heavier anilox roller, the labor intensity of the operator will be excessive, and the anilox roller may be damaged. The anilox roller should be supported by the journal when stored, and should never be stacked on top of each other. The anilox roller should be wrapped after cleaning to prevent accidental damage. Items covering the anilox roller should be clean and dry. 11. Strictly inspect the cleaning area. Is there good lighting in the cleaning area? Is it easy to clean the cleaning area after cleaning the anilox roller? If using ultrasonic or water spray cleaning device, is the water tank clean? Is the solvent clean? It is impossible to clean the anilox roller with a chemical cleaning agent saturated with residual ink. 12. Check the doctor blade device. How often does the doctor blade change? The replaced old doctor blade can never be used again. Is the ink tank cleaned without dry ink consolidation? Do any screws touch the surface of the anilox roller and damage the surface? The Mesh Coin Purse is more convenient to carry, comfortable to feel, and easy to clean, so that the most things can be packed in the smallest space. Digital printing, silk-screen printing, and other printing methods and accessories combination for relevant design, is the combination of practicality and aesthetic culture. Mesh Coin Purse,Vintage Mesh Coin Purse,Vintage Metal Mesh Coin Purse,Antique Mesh Coin Purse Jilin Y.F. Import & Export Co.,Ltd , https://www.yfpencilcase.com
