Knowledge of the maintenance of flexographic printing anilox roller
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In daily work, if the anilox roller cannot be used reasonably, it will not only affect the uniform transmission of the ink, but also damage the printing quality of the printed matter, and greatly reduce the service life of the anilox roller itself. Therefore, the first step in the maintenance of flexographic anilox rolls is to learn to use them properly.
Anilox roller operation
First, the anilox roller blade angle
The angle between the blade and the tangential line of the anilox roll contact is generally between 25 degrees and 30 degrees. If the angle is too large, the scraper is almost against the anilox roller, and the surface of the anilox roller is not smooth. When it is running at high speed, it will cause the elastic scraper to vibrate or jump, causing the solution to be bounced and cause coating. The unevenness of the amount of cloth causes a problem that the difference in coating amount is large. In addition, too large angles can easily damage the blade.
Second, the sharpness of the anilox roller scraper
The sharpness of the blade depends mainly on the angle of blade wear and the purity of the solution and the quality of the knife. In the case of a new knife, the sharpness of the knife should be such as to effectively scrape the layer of adhesive on the anilox roll without creating a knife. When the sharpness of the knife is moderate, the solution layer can be effectively scraped off, thereby obtaining a uniform coating amount, and conversely, the difference in coating amount becomes large.
Third, the flatness of the anilox roller scraper
If the flatness of the blade is not warped, the coating amount is uniform, otherwise the difference in coating amount becomes large. The flatness of the scraper depends on the method of installing the scraper. Of course, it may also be related to the sticking of foreign matter on the insert or the lining of the insert. Therefore, the lining should be wiped off during the loading, and then the new knives should be placed behind the lining. Load into the slot. Rotate the back screw of the knife, first tighten it from the middle of the blade, then gradually tighten it to both sides, and tighten the two sides. In order to prevent the blade from warping, it should be completed two or three times when tightening the screw. While screwing the screw, hold the block cloth and clamp the blade and the lining, and pull it tightly to one side, so that the knife is relatively flat. In order to ensure the difference in coating amount within the standard range.
Fourth, the left and right movement of the anilox roller scraper
The left and right movement of the scraper plays an important role in feeding the scraping line, improving the utilization of the scraper, and reducing the wear on the anilox roller. From this aspect, the mesh wall is less worn, the net is relatively deep, and the fluid portion is more loaded, which is beneficial to achieve The amount of coating required. The aluminum foil and the polyvinyl chloride sheet are heat-sealed after discussion of the optimum coating amount of the aluminum foil substrate and the adhesive, and the degree of adhesion of the two after heat sealing is usually measured by the heat-sealing strength of the adhesive layer. In a certain range, the heat-sealing strength of aluminum foil and PVC is proportional to the coating amount, but it is not proportional to a certain extent. In most cases, the coating amount can be satisfied at 3-6g/cm^2. Heat seal strength requirements. If the coating amount is increased, the heat seal strength value tends to balance as the coating amount increases to a certain value, and the heat seal strength curve tends to be balanced, and the strength change is small, so that it is not necessary to increase the amount of the adhesive coating, and increase cost.
Scraper use precautions:
(1) Do not over pressurize the squeegee in order to get more color to increase the anilox roller and blade wear;
(2) Do not rotate the dry anilox roller against the squeegee;
(3) Each time the squeegee is updated, the pressure needs to be reset, and the wrong pressure setting will produce scraper fragments and damage the roller surface;
(4) Stop using the scraper that has exceeded the maximum wear degree, establish a daily flow to monitor the change of the scraper wear, stably control the wear level of the scraper, and avoid damage to the anilox roller;
(5) Keep the roller parallel to the scraper at all times, and check and calibrate every 15 days.