The traditional letterpress and planographic multicolor printing equipment, the inking system composed of the ink fountain roller, the inking roller string ink roller and the inking roller, etc., need a dozen or even dozens of ink rollers. Requirements, however, the inking system cannot achieve a constant supply of ink. The short ink path ink supply device of the flexographic printing machine can basically achieve a uniform and stable ink supply through the anilox roller's cell with a constant amount of ink supply. It can be seen that the anilox roller is a very important component on a flexographic printing machine. Keeping the anilox roller surface and mesh holes intact is an important part of achieving normal and uniform ink supply and ensuring the quality of the printing ink color.
However, the "groove" appearing on the surface of the anilox roller due to damage will directly affect the uniformity of the ink color on the â…¡ surface. The so-called "groove" refers to one or several dents on the surface of the anilox roller in the horizontal or vertical direction. Once "grooves" appear on the surface of the anilox roller, it will affect the uniform and quantitative normal ink supply and inking, which is also the cause of the streak on the printing plate surface. It can be seen that the "groove" mark of the anilox roller can be avoided to ensure the ink color quality of the product. After thinking and analyzing, the author thinks that the reason for the "groove" of the anilox roller may be related to the following situations.
Undesirable phenomena caused by excessive roller pressure
Maintaining a uniform and moderate roll pressure is a reliable guarantee to prevent damage to the surface of the anilox roll. However, if the ink supply of the anilox roller does not match the structure of the printing plate and the ink supply is abnormal, the wear of the anilox roller may be exacerbated by the pressure of the roller. Therefore, it is necessary to carefully adjust the pressure between the anilox roller and the plate roller. If the contact pressure between them is too heavy, it is easy to damage the ceramic layer on the surface of the anilox roller, causing the edge of the mesh to crack and form a "groove" "In order to prevent this phenomenon, each time the plate is installed, the anilox roller and the plate roller should be corrected. When drawing, a slight resistance is used to make the gap between the anilox roller and the plate roller. The pressure should be adjusted to the parallel state and the contact pressure should be kept uniform.
Undesirable phenomena caused by aging of anilox roller
If the anilox roller body is eccentric or the shaft head and connecting parts are worn or loose, the anilox roller will easily contact the scraper or plate roller during the rolling process, which will cause the scraper and the mesh Unusual wear of the anilox roller, which causes one or more "groove" phenomena on the anilox roller surface. This should be checked and targeted repair measures should be taken to eliminate bad phenomena to improve the accuracy of the anilox roller. .
Defects caused by improper maintenance of anilox rollers
The use of ultrasonic cleaning anilox roller is to immerse the anilox roller in the groove of the ultrasonic cleaning device of the chemical cleaning solution. The frequency conversion device in the groove emits high-frequency sound waves to vibrate the solution and generate bubbles and impact force. The anilox roller is cleaned in high-frequency ultrasonic vibration for a long time, and the ceramic on the anilox roller surface is easily damaged to form a "groove" phenomenon, so it is necessary to grasp the appropriate cleaning time. In addition, if the anilox roller is disassembled and installed, if it is not careful, it will easily scratch the surface of the anilox roller and cause "groove" phenomenon. Therefore, care must be taken to maintain and maintain the anilox roller carefully, and the anilox roller should be handled with care when removing and installing it. Any unused anilox rollers should be placed on the shelf to prevent deformation. For anilox rollers that are not used for a long time, it is best to protect the roller body with a sheath. When sending anilox rollers to be processed in different places, more attention should be paid to packaging to prevent them from being subjected to severe vibration or wear and avoiding deformation.
Improper adjustment of the blade or bad phenomenon. The blade is a wearing part. After a certain period of use, the blade will inevitably produce wear and make the working surface uneven, so that the longitudinal part of the anilox roller is easily scraped into a "groove". In addition, if the scraper device has looseness and tremor, it is easy to aggravate the wear of it and the anilox roller and the degree of friction between it and the anilox roller. Therefore, the worn scraper should be processed and sharpened in time. If there is any abnormal phenomenon of loosening of the scraper, corresponding technical measures should be taken to eliminate it to ensure its normal use.
When using the doctor blade, you should also pay attention to adjust the contact surface parallel to the anilox roller, the pressure should be adjusted as lightly as possible, as long as the excess ink on the surface of the anilox roller can be scraped off, it should also be at an angle to the anilox roller The adjustment is good, which can effectively reduce the chance of "groove" generated by the worn anilox roller.
Technological measures to prevent "grooves" in anilox rolls
The characteristics of the flexographic equipment and process determine that the accuracy requirements of the anilox roller are much higher than those of ordinary relief and offset printing rollers. Therefore, only high-precision anilox rollers can guarantee the printing quality of products. To this end, we must pay attention to making a suitable anilox roller. If the angle of the cell edge of the anilox roller is set to 90. The corners are most likely to crack or wear and cause the "groove" phenomenon. For this reason, the angle of the edge of the mesh should be made into a rounded corner to reduce the damage of the mesh. On the other hand, according to the characteristics of the printing plate, the anilox roller should be used reasonably. Selecting an appropriate number of lines of the anilox roller is helpful to prevent the "groove" phenomenon of the anilox roller caused by uncomfortable roller pressure. The cell density of the anilox roller is generally four times that of the flexographic dot line. In addition, when making anilox rolls,
It is intended to adopt a suitable mesh shape. The hexagonal platform has a large opening angle, which is easy to transfer ink and ink, and the partition wall between the mesh holes has high strength, which can better resist the friction force of the scraper on it, reduce the degree of wear of the mesh holes, and avoid the formation of "groove" on the roller surface. Slot phenomenon.
A floating shelf is a form of shelf with its wall fixings hidden within the shelf board, with no visible supporting brackets. It can be supported on hidden rods or bars that have been attached to studs. A thick floating shelf may be made of a hollow-core shelf glued to a cleat.
A floating shelf may have two or more channels open from the back towards, but without reaching, the front, into which slide fasteners attached to the wall, typically held in place by screws inserted through the bottom of the shelf.
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