Anilox Roll Introduction

The flexographic printing press uses a typical short ink supply system with a relatively simple structure. It consists of an ink tank, a rubber roller, a doctor blade, and an anilox roller. Among them, the anilox roller is the core component of the flexographic printing press, which is responsible for evenly transferring a certain amount of ink to the printing plate.

First, the surface structure of the anilox roller in the surface of the anilox roller evenly distributed with many consistent shape of the micro-hole, generally we call it "ink hole", it is these ink hole in the printing plays a storage ink, even ink And the role of quantitative transmission of ink. The ink hole is generally carved in a direction of 45[deg.] with respect to the axis, and the partition wall between the ink holes is called a 'web wall', and the area of ​​the water wall is related to the shape of the ink hole.

Several common ink hole shapes include: quadrangular pyramid, quadrangular pyramid, hexagonal pyramid, trapezoidal cross-hatched, and additional channel ink. The opening degree and depth of the ink hole have a considerable influence on the ink transfer performance of the ink hole. The greater the opening degree and the shallower the depth, the better the ink-transporting property; otherwise, the ink-transmitting property is poor. In the above-mentioned several kinds of ink hole shapes, the opening degree of the hexagonal table-shaped ink hole is relatively large, so its ink setting and ink releasing performance are relatively good. Therefore, ink of this shape is often used in engraving anilox rollers. hole.

However, during the printing process, due to the effect of the squeegee, the anilox roll will wear to a certain degree. Over time, the opening degree of the ink hole will gradually become smaller, and the depth will gradually become shallow, so that the anilox roller can be transmitted. Ink declines, and the total amount of ink delivered gradually decreases. The coating (chromium or ceramic) on the surface of the anilox roller is of great importance for improving the abrasion resistance of the anilox roller and prolonging the service life of the anilox roller.

Second, the number of anilox roller The number of anilox roller refers to the number of ink holes per unit length of the surface of the anilox roller. It is also one of the important parameter indexes of the anilox roller. It also has the ink transfer performance of the anilox roller. Very important influence. In general, the higher the number of lines of the anilox roller, the smaller the amount of ink transferred, and vice versa. In addition, the number of lines of the anilox roller also determines its own scope of application. In general, when printing large areas of solid blocks or requiring less high images, consider using a low number of anilox rollers. For example, 360 lines/inch or so of anilox rollers can be used to print solid areas. On the contrary, when printing fine images or fine texts and lines, an anilox roller with a relatively high number of lines should be used to prevent a serious increase in the value of hue due to the small dots in the high light region being immersed in the ink holes, or the extremely fine tone values. The lines are thicker. However, the number of lines of the anilox roller should not be too high. If the number of lines of the anilox roller is too high, not only will the processing process of the anilox roller pose a certain degree of difficulty, but also, due to the high number of anilox roller network walls. When the thickness becomes thinner, the strength is reduced and it is easily damaged. That is, if the number of lines of the anilox roller is too high, the service life of the anilox roller is shortened accordingly. In general, the number of lines of the anilox roller is four times or five times the number of screens of the printing job. Of course, it also depends on the actual production of the printed image.

Third, the use of anilox roller and protection Anilox roller is a very precise mechanical parts, and it is still the core component of the flexographic printing press, therefore, in the use of the process must be careful to avoid bump or damage. When installing or removing the anilox roller, be sure to press it evenly and gently, and install the anilox roller securely in the support slot or remove it from the printing press. During the printing process, the pressure between the doctor blade and the anilox roller and the roller and the anilox roller should be as small as possible to reduce the wear on the anilox roller. After shutting down, the anilox roller and the rubber roller must be separated from each other. Otherwise, the anilox roller will be bent and deformed due to the long-term stress in one direction, resulting in uneven ink transfer from the anilox roller. In addition, after the end of each printing, the anilox roller must be cleaned in a timely manner to prevent the pigment particles in the ink from drying in the ink hole, causing blockage of the ink holes and affecting the printing production.

During the storage process, the anilox roller should be protected to prevent the surface from being damaged or hit by foreign objects. In addition, it should be placed in a special storage tank to prevent the surface from being stained with oil, dust or dust.