On traditional letterpress and planographic multi-color printing machines, the inking system is composed of a dozen or even twenty ink rollers, such as ink fountain roller, ink transfer roller, ink leveling roller, cross-ink roller and inking roller, which can basically meet the printing ink inking Requirements. However, this type of inking system is not easy to achieve a constant ink supply. The flexographic printing machine uses a short ink path ink supply device, through the anilox roller cell to provide a constant amount of ink supply, can basically achieve a uniform and stable ink supply. The anilox roller plays an important role in the flexographic printing machine. Understanding and understanding the anilox roller correctly and using the anilox roller scientifically and rationally are very important instructions for avoiding blindness in operation and improving product quality and production efficiency. significance. 1. The type and performance of the anilox roller Anilox rollers are divided into two types: metal engraved anilox rollers and ceramic anilox rollers. The surface of the anilox roller is engraved with an inked hole, also called a net hole, through which a quantitative and uniform ink transfer and ink application effect can be achieved. Therefore, the use of an anilox roller can accurately control the amount of ink delivery. This is also the advantage of the flexo printing machine's ability to achieve uniform ink delivery on short ink paths. The structure and number of inking holes determine the ink transfer performance and application range of the anilox roller. The uniformity of the inking holes determines the uniform ink quality. The density (number of screen lines), shape, size and depth of the inking holes determine The amount of ink transfer. The manufacturing process of the metal anilox roller is relatively complicated. It is usually a seamless steel tube that is copper plated on its surface after finishing to form an easy-to-process base layer, and then the surface is carved into a uniform shape and uniformly inked holes divided into Chinese flexographic cloth, and finally plated on the surface A layer of metallic chromium to improve wear resistance. The coating on the surface of the ink hole also has an effect on the ink transfer performance of the anilox roller, which is directly related to the service life of the anilox roller. If the plating layer is not wear-resistant, the mesh holes are prone to wear and affect the ink transfer effect. The ceramic anilox roller uses plasma technology to spray a layer of synthetic ceramic coating Cr2O3 on the surface of the roller body, and then engraves ink holes on the roller surface with a laser. The wear resistance of ceramic anilox rollers is better than that of metal anilox rollers, and the inking hole mesh line can be up to 1200 lpi, which is suitable for printing fine color products. Because the ceramic anilox roller can form a thin and uniform ink film, the ink consumption is small, and it is helpful to improve the drying speed of the spring ink layer. It can also reduce the dot expansion during high-speed printing and effectively improve the printing quality of the product. [next] 2. The mesh shape and angle of the anilox roller The shape and angle of the anilox roller are different, and the use characteristics and effects are also completely different. 1. Net shape The cell of the anilox roller generally has a quadrangular pyramid shape, a quadrangular pyramid shape, a hexagonal pyramid shape, a trapezoidal cross-section oblique line shape, and the like. The use of quadrangular pyramid cells is more common in production. Its disadvantage is that the bottom surface of the cells is small, and it is difficult for the ink to come out completely, which brings certain difficulty to cleaning. This kind of mesh is generally only suitable for the use of rubber ink fountain roller inking structure. The four-sided mesa shaped hole has better ink release performance and a certain degree of flexibility. It is not only suitable for rubber ink fountain rollers, but also can be used for the doctor blade device. The anilox roller adopting the doctor blade device can make the ink transfer thin and even, and has certain promotion effect on improving the quality of the color screen printing. Hexagonal pyramid-shaped mesh holes have good inking and releasing performance, and are not easy to produce moire during the ink transfer process, which is more suitable for printing screen products. Hexagonal anilox roller also has high strength, which can effectively reduce the wear of the doctor blade. Trapezoidal cross-shaped oblique mesh cells are carved at a 45 ° spiral angle with the anilox ink roller lines. This kind of mesh cells can better ensure the fluidity and ink transfer of ink. It is mainly suitable for high viscosity inks and can also be used for glazing coating process. 2. Arrangement angle of net hole In addition to the shape of the anilox roll cells affecting printability, the arrangement angle of the cells also has a certain effect on printing. When printing color products, if the angle of the printed image and text does not match the angle of the anilox version of the cell, moire can easily appear on the printed product. The arrangement angles of commonly used net holes are 30 °, 45 °, 60 °, etc. The 30 ° hexagonal mesh hole has good ink transfer performance, but the horizontal mesh wall on the surface of the anilox roller is likely to cause the doctor blade and anilox roller surface to be worn. In addition, because the anilox roller rotates at a high speed, the horizontal mesh wall will destroy the uniformity of the ink flow, making it difficult to form a uniform ink layer in the 30 ° hexagonal mesh cavity. This kind of angle cell is more suitable for glazing coating process, and also suitable for machines without squeegee structure for printing solid version, line version or text version products. The 45 ° prismatic mesh has better working performance, and can effectively avoid moire when printing color pictures. But the bottom of the mesh is prone to plug the ink, which makes the ink transfer incomplete and increases the difficulty of cleaning, so this mesh is not suitable for printing fine color printing products. The 60 ° hexagonal mesh cell has the highest area utilization rate per unit area. The mesh wall is narrow and the remaining area is small. The mesh cell has a shallow depth and a wide opening. The amount of ink transfer is significantly increased, and the ink transfer It is also smooth and easy to clean. [next] 3. The correct use and maintenance of the anilox roller 1. Choose the anilox roller according to the characteristics of the substrate If the surface of the substrate is rough, the ink absorption is large, and an anilox roller with a small number of anilox lines should be used. Because the mesh holes are large, the amount of ink transfer is large. Conversely, if the printing surface is relatively smooth and the amount of ink absorption is small, an anilox roller with a high number of anilox lines and a small amount of ink transfer should be used. Common options are as follows: For lapping of printed products, 100 lpi anilox roller can be used; for printing solid version on absorbent materials, 150 lpi anilox roller can be used; For printing solid version on non-absorbent plastic, aluminum foil and other materials, 200 lpi anilox roller can be used; For printed text version, field version, line version or screen type products, 250 ～ 300 lpi anilox roller can be selected as appropriate; For printing screen products on non-absorbent plastic, aluminum foil and other materials, 350 lpi anilox roller can be used; For printing dark-colored prints, 400 lpi anilox roller can be used; For printing special fine products, 450 ～ 550 lpi anilox roller can be used as appropriate. 2. Select the anilox roller according to the screen line of the printing plate In order to accurately and completely reproduce the dots of each tone layer of the flexographic printing, it is necessary to ensure that each dot on the printing plate can be inked, to avoid the dots falling into the mesh wall of the anilox roller and the ink hole, resulting in no ink or Insufficiency. Therefore, the area of ​​the aperture of the ink hole of the anilox roller selected should be smaller than the dot area of ​​the printing plate, that is, the line number of the anilox roller should be greater than the mesh line number of the printing plate, to ensure that each printing plate dot is transmitted by one or several meshes The ink hole of the ink roller provides ink. In order to prevent moire on printed products, the anilox roller's cell angle is preferably 45 °. The ratio of the number of anilox lines of the anilox roller to the number of screen lines of the printing plate is generally 3: 1 to 4: 1. 3. Select the anilox roller according to the characteristics of the printing layout For printing fine anilox plates or fine text layouts, anilox rollers with a higher anilox number can be selected. In this way, the amount of ink transfer is small, and the ink coating is uniform. Conversely, for printing large-area or large-format layouts, you can choose an anilox roller with a small number of screen lines to ensure that the layout obtains a uniform and sufficient amount of ink for China Flexo 2009. 4. Choose anilox roller according to different inking device Under the condition of the same number of anilox lines, the ink transfer volume of the quadrangular pyramid inking hole is generally smaller than that of the quadrangular pyramid-shaped inking hole, and the volume of the tapered inking hole will be reduced due to wear. Therefore, the anilox ink roller with quadrangular pyramid inking hole structure is suitable for the rubber ink fountain roller-anilox ink roller inking system, and the anilox ink roller with quadrilateral and hexagonal meridian ink holes is suitable for anilox ink roller -Squeegee inking system. When the ink scraper is used to scrape off the floating ink on the surface of the anilox roller, it is required to scrape cleanly, and no ink is left on the surface of the anilox roller, so the volume of the ink hole of the anilox roller used in this type of inking system must be Larger, and the number of anilox rollers requires more than 500 lpi. 5. Close the processing technology of the anilox roller If the edge angle of the anilox roller is made into 90 ° right angle, the edge is easy to be scratched. For this reason, the manufacturing process of the anilox roller can add a finishing process to make the edge angle of the mesh into a rounded corner, which can reduce the damage of the edge of the mesh. 6. Close the maintenance of the anilox roller When cleaning the anilox roller, the cleaning agent or method provided by the cleaning machine or ink factory should be used for cleaning to prevent damage to the anilox roller due to improper cleaning. When using ultrasonic to clean the anilox roller, immerse the anilox roller in an ultrasonic cleaning tank equipped with a chemical cleaning solution. The frequency conversion device in the tank emits high-frequency sound waves, so that the solution vibrates to generate bubbles and impact power to achieve the purpose of cleaning. If the ceramic anilox roller is cleaned in high-frequency ultrasonic vibration for a long time, the ceramic on the surface is easily damaged, so the cleaning time should be moderate. If you are not careful during the disassembly and installation process, it is easy to scratch 27 equipment and equipment China Flexo Printing Spring Equipment and Equipment 28 Injury to the surface of the anilox roller and produce grooves. Therefore, the anilox roller should be carefully maintained and maintained. Any unused anilox roller should be placed on the shelf to prevent deformation; for an anilox roller that has not been used for a long time, it is best to protect the roller body with a sheath to protect it; When the corrugated roller is sent to other places for processing, more attention should be paid to packaging to prevent it from being subjected to severe vibration or wear and deformation. [next] 4. Precautions for using anilox roller 1. Pay attention to the correct control of roller pressure During printing, maintaining a uniform and moderate pressure on the anilox roller is a reliable guarantee to prevent damage to the surface of the anilox roller. However, if the screen line of the anilox roller does not match the screen line of the printing plate, resulting in abnormal ink supply, the wear of the anilox roller may often be exacerbated by incorrectly applying roller pressure. 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 series of scratches. trace. In order to prevent this phenomenon, in printing production, to correct the pressure between the anilox roller and the plate roller, the method of plugging the anilox roller and the plate roller on both sides with a plug of appropriate thickness can be used. At the time of drawing, with a slight resistance as the degree, the pressure between the anilox roller and the plate roller is adjusted to a parallel state, and the contact pressure should be kept uniform. 2. Pay attention to the correct adjustment of the scraper The scraper is a wearing part. After a period of use, it will inevitably cause abrasion and cause the working surface to be uneven. It is easy to scrape the longitudinal part of the anilox roller into a groove. In addition, if the doctor blade device loosens or trembles, it is easy to aggravate the degree of wear of the anilox roller. Therefore, the worn scraper should be processed and sharpened in time. If the squeegee is abnormally loose, corresponding technical measures should be taken to eliminate it to ensure its normal use. When using a squeegee, pay attention to adjust the contact surface parallel to the anilox roller, and adjust the pressure as lightly as possible, as long as the excess ink on the surface of the anilox roller can be scraped off. The angle between the scraper and the anilox roller should also be adjusted, which can effectively reduce the degree of wear. When the anilox roller has no ink, never let the scraper directly dry-contact the anilox roller. Through these control measures, the "groove" generated by the anilox roller can be reduced. 3. Pay attention to keeping the machine clean The anilox roller should be carefully checked and cleaned of dust or other impurities on the surface of the anilox roller before use to prevent the anilox roller from being damaged by abnormal friction. If the surface of the anilox roll is damaged, stop using it immediately, so as not to damage the ink fountain roller and the printing plate, and affect the printing quality of the product. During production, the transmission gear between the anilox roller and the ink fountain roller should be inspected. If there are impurities clogged, they should be cleaned up, and a certain amount of gear lubricant should be applied to prevent the anilox roller from jumping and damage. In summary, as the core component of the flexographic printing machine's inking system, the anilox roller is very important to the printing production efficiency and product quality. Careful use and maintenance of anilox rollers can effectively improve production efficiency and ensure the printing quality of products. Waterproof Gym Bag Waterproof Gym Bags Waterproof Gym Bag,Small Waterproof Gym Bag,Fashion Waterproof Gym Bags,Cool Waterproof Gym Bags,Gym Bag For Jogging,Trendy Gym Bags For Women Kang Jin Apparel Co., Ltd. , http://www.classicsbags.com
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