In the printing process, the main components of the printing press, such as the plate cylinder, the impression cylinder, the anilox roller, the inking roller, and the transmission gears, may change their accuracy and adjustment accuracy due to various factors. As a result, the printing quality is affected. During the printing process, inspections should be carefully and carefully conducted to find out problems and solve them in a timely manner.
(1) Plate cylinders, impression cylinders, possible problems, mainly three
The concentricity of a cylinder body and the support journal, the concentricity of the plate cylinder and the impression cylinder must be good, when the printer is operating normally, the vibration error can not exceed 0.01mm, otherwise the pressure of the dot is not easy to adjust. Pressure is more important, and the pressure is lighter. Some image dots are printed and some are not printed.
Second, the parallelism between the two rollers changes, the printing pressure changes, if the two rollers are not parallel, one end of the gap is large, so that the printing pressure becomes smaller, the ink transfer volume is small, the printing ink is insufficient; the other end of the gap is small, the printing pressure becomes Large, large amount of ink transfer, so that the printing ink is heavy, easy to form in the same printing surface, one end of heavy ink, the other end of the ink light defects.
Third, the gap between the two rollers changes, the printing pressure changes, the gap between the two rollers is large, the pressure is small, the amount of ink transfer is small, and the printing ink is light, whereas the ink is thick.
(2) Problems that may occur with the anilox roll include problems with the accuracy of the anilox roll itself and the positional accuracy between the plate cylinder and the inking roll.
The accuracy of the anilox roll changes. The accuracy of the anilox roller mainly includes three aspects of the depth of the network, the number of screen lines and the surface finish.
Anilox roller hole depth: The depth of anilox roller wire engraving will directly affect the output of ink volume. The depth of the engraving of the network cable will result in a large amount of ink output, and the printed ink will be thick and deep, with a bright color. However, attention must be paid to the drying of the ink layer. Too much ink layer thickness will make the printed ink color not easy to dry. Can easily form the outside dry and the inner layer is not dry, resulting in the product sticky ink; the other hand, the network line engraving is shallow, anilox roller is difficult to print the ink on the printing plate, the printed product lacks a certain amount of ink, color degree difference.
At present, the depth of the general anilox roller network engraving is between 22μ and 30μ. According to different properties of the substrate and the product using the appropriate depth of network cable. If the ink viscosity, particle size and other factors or the anilox roller surface wear and other factors, change the depth of the anilox roller will reduce the amount of ink to the plate, a direct impact on the quality of the print.
Anilox roller finish: Anilox roller engraving has a good finish, uniform ink transfer, fine texture, and good dot formation. Especially in the flat-screen printing is more obvious, otherwise it will make ink uneven, point-tone tone formed after the dot printing is not ideal, the clarity is also damaged.
The number of anilox roller screens; the number of screen lines on the anilox roller is very important for the printed cable products and is generally configured according to the quality requirements of the printed materials. If the number of anilox roller screens and prints are found during the printing process, If the quality requirements do not match, replace them promptly.
The relative positions of the anilox roller and the plate cylinder and the ink roller are changed, including the change of the parallelism and the change of the gap between them. These changes will change the ink transfer performance of the anilox roller and affect the quality of the printed matter.
(3) Problems that may occur with the inking roller are the loss of surface quality and the change in the positional accuracy of the anilox roller.
The surface quality of the ink roller is damaged. If the surface of the upper roller has grinded lines or scratches, when the dot product is printed, the ink is uneven and the color is uneven. The printed cable is more visible. Therefore, the appearance of the ink roller must not have worn silk lines or scratches, if it is found that it should be replaced in time.
The position of the inking roll and the anilox roll changes, mainly referring to the parallelism and the size of the gap between them. These changes directly affect the change in ink transfer performance, and special attention should be paid to the inspection.
(4) The accuracy of the transmission gear changes, and the accuracy of the gear is the basis for ensuring the concentricity of each roller.
The precision of the gears of each roller is not good, and mechanical defects such as micro-vibration may be generated, which brings certain difficulties to the printing of the network cable, so that the entire screen printing cannot obtain an ideal printing pressure.
At the same time, if the gear transmission surface is not clean and dirt, it will affect the transmission accuracy.
(1) Plate cylinders, impression cylinders, possible problems, mainly three
The concentricity of a cylinder body and the support journal, the concentricity of the plate cylinder and the impression cylinder must be good, when the printer is operating normally, the vibration error can not exceed 0.01mm, otherwise the pressure of the dot is not easy to adjust. Pressure is more important, and the pressure is lighter. Some image dots are printed and some are not printed.
Second, the parallelism between the two rollers changes, the printing pressure changes, if the two rollers are not parallel, one end of the gap is large, so that the printing pressure becomes smaller, the ink transfer volume is small, the printing ink is insufficient; the other end of the gap is small, the printing pressure becomes Large, large amount of ink transfer, so that the printing ink is heavy, easy to form in the same printing surface, one end of heavy ink, the other end of the ink light defects.
Third, the gap between the two rollers changes, the printing pressure changes, the gap between the two rollers is large, the pressure is small, the amount of ink transfer is small, and the printing ink is light, whereas the ink is thick.
(2) Problems that may occur with the anilox roll include problems with the accuracy of the anilox roll itself and the positional accuracy between the plate cylinder and the inking roll.
The accuracy of the anilox roll changes. The accuracy of the anilox roller mainly includes three aspects of the depth of the network, the number of screen lines and the surface finish.
Anilox roller hole depth: The depth of anilox roller wire engraving will directly affect the output of ink volume. The depth of the engraving of the network cable will result in a large amount of ink output, and the printed ink will be thick and deep, with a bright color. However, attention must be paid to the drying of the ink layer. Too much ink layer thickness will make the printed ink color not easy to dry. Can easily form the outside dry and the inner layer is not dry, resulting in the product sticky ink; the other hand, the network line engraving is shallow, anilox roller is difficult to print the ink on the printing plate, the printed product lacks a certain amount of ink, color degree difference.
At present, the depth of the general anilox roller network engraving is between 22μ and 30μ. According to different properties of the substrate and the product using the appropriate depth of network cable. If the ink viscosity, particle size and other factors or the anilox roller surface wear and other factors, change the depth of the anilox roller will reduce the amount of ink to the plate, a direct impact on the quality of the print.
Anilox roller finish: Anilox roller engraving has a good finish, uniform ink transfer, fine texture, and good dot formation. Especially in the flat-screen printing is more obvious, otherwise it will make ink uneven, point-tone tone formed after the dot printing is not ideal, the clarity is also damaged.
The number of anilox roller screens; the number of screen lines on the anilox roller is very important for the printed cable products and is generally configured according to the quality requirements of the printed materials. If the number of anilox roller screens and prints are found during the printing process, If the quality requirements do not match, replace them promptly.
The relative positions of the anilox roller and the plate cylinder and the ink roller are changed, including the change of the parallelism and the change of the gap between them. These changes will change the ink transfer performance of the anilox roller and affect the quality of the printed matter.
(3) Problems that may occur with the inking roller are the loss of surface quality and the change in the positional accuracy of the anilox roller.
The surface quality of the ink roller is damaged. If the surface of the upper roller has grinded lines or scratches, when the dot product is printed, the ink is uneven and the color is uneven. The printed cable is more visible. Therefore, the appearance of the ink roller must not have worn silk lines or scratches, if it is found that it should be replaced in time.
The position of the inking roll and the anilox roll changes, mainly referring to the parallelism and the size of the gap between them. These changes directly affect the change in ink transfer performance, and special attention should be paid to the inspection.
(4) The accuracy of the transmission gear changes, and the accuracy of the gear is the basis for ensuring the concentricity of each roller.
The precision of the gears of each roller is not good, and mechanical defects such as micro-vibration may be generated, which brings certain difficulties to the printing of the network cable, so that the entire screen printing cannot obtain an ideal printing pressure.
At the same time, if the gear transmission surface is not clean and dirt, it will affect the transmission accuracy.
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