Our company selected an imported three-color printing machine. The ceramic roller was 260 lines. However, after using for a period of time, one or two grooves appeared on the surface of the ceramic roller, which made it possible for almost every type of printing product. There was a slight or severe dew-white line, which made the quality of our products greatly diminished. Sometimes we were met with customer complaints. Every time we wait until we die, the company only takes a few moments to polish it. At least it must be tens of thousands. Money is not a problem, but it is a headache for our operators. Every time they appear, they must take pains to debug, but it is not always ideal. Good times only wait until the scraper wears out to the right time or ink. When the viscosity is appropriate, the dew-white line will change slightly, and it is really impatient!
A: The conventional letterpress and lithographic multicolor printing equipment, which consists of ink fountain roller, ink transfer roller ink roller, and ink roller, needs dozens or even dozens of ink rollers. Infusion requirements, however, the inking system cannot achieve a constant ink supply. The short ink path ink supply device of the flexographic printing press can achieve a uniform and stable ink supply through a constant supply of ink through the anilox roll. It can be seen that the anilox roller is a very important component of the flexographic printing press. Maintaining the surface of the anilox roller and the integrity of the mesh is an important part of achieving normal and uniform ink supply and ensuring the quality of the printed ink.
However, due to the "grooves" appearing on the surface of the anilox roll, it will directly affect the uniformity of the ink toward the layout. The so-called "trench" refers to the surface of the anilox roller horizontal or vertical one or more depressions appear damage marks. Once the “groove†appears on the surface of the anilox roller, it will affect the normal and quantitative normal ink supply and ink deposition, which is also the cause of streaks on the printed page. It can be seen that the “groove†marks of the anilox roller can be avoided to ensure the ink quality of the product. After thinking and analyzing, the author thinks that the reason why the anilox roller produces "grooves" may be related to the following situations.
The bad phenomenon caused by excessive roller pressure
Maintaining a uniform and moderate roll pressure is a reliable guarantee for preventing the surface damage of the anilox roll. However, if the ink supply is not normal due to the mismatch between the anilox roller cable and the printing plate surface structure, the degree of abrasion of the anilox roller may be aggravated due to the mis-rolling pressure. Therefore, the pressure between the anilox roller and the plate roller must be carefully adjusted. If the contact pressure between them is too heavy, the ceramic layer on the surface of the anilox roller can be easily damaged, and the edge of the mesh cavity can be cracked to form a groove. "In order to prevent this from happening, each time after loading, correct the difference between the anilox roller and the plate roller, and use a slight resistance when pulling, so that between the anilox roller and the plate roller, The pressure is adjusted to the parallel state and the contact pressure is maintained uniform.
Anilox roll aging problems
If the rollers of the anilox roller are eccentric or the spindle head and the connector are worn or loosened, the anilox roller can easily contact with the blade or the plate roller during the rolling process. This will cause scrapers and nets. The abnormal wear of the roller, which in turn causes one or more "grooves" on the surface of the anilox roller, should be checked and targeted repair measures must be taken to eliminate undesirable phenomena and improve the accuracy of the anilox roller. .
Bad phenomenon caused by improper maintenance of anilox roller
Ultrasonic cleaning of the anilox roller is to immerse the anilox roller in the tank of the ultrasonic cleaning device of the chemical cleaning solution. The frequency conversion device in the tank emits high-frequency sound waves, so that the solution vibrates and generates bubbles and impact forces, so as to achieve the purpose of cleaning. The anilox roller is cleaned in high frequency ultrasonic vibration for a long time. The ceramic on the surface of the anilox roller is easily damaged and forms a "trench" phenomenon, so it is necessary to grasp the proper cleaning time. In addition, if the roller is disassembled and installed, if it is not careful, it can easily scratch the surface of the anilox roller and cause a "trench" phenomenon. Therefore, it is necessary to carefully maintain and maintain the anilox roller. Care must be taken when disassembling and installing the anilox roller. Unused anilox rolls should be placed on a shelf to prevent deformation. For long-timeless anilox rolls, it is best to protect the roll body with a protective cover. When the anilox roll is sent to a remote site for processing, it must pay attention to packaging well to prevent it from being subject to severe vibration or wear and deformation.
Scraper misadjustment or presence of defects Squeegee is a consumable part. After a certain period of use, the scraper will inevitably wear out, making its working surface uneven, and it is easy to make the longitudinal part of the anilox roller scraped into a “trenchâ€. In addition, if the squeegee device is loosened or tremors, it may easily aggravate the abrasion of the anilox roller and the degree of friction of the anilox roller. Therefore, the worn scraper should be processed and ground in time. If the squeegee has an abnormal phenomenon of loosening, it should be taken to eliminate the corresponding technical measures to ensure its normal use. When using a squeegee, attention should also be paid to aligning the contact surface with the anilox roller in parallel. The pressure should be reduced as much as possible, as long as the excess ink on the surface of the anilox roller can be scraped off, and the angle of the anilox roller is also required. Adjust it so that it effectively reduces the chance of wearing the anilox roller creating a "trench".
Technology measures to prevent "grooves" from appearing in the anilox roll
The characteristics of the flexographic equipment and process have determined that the accuracy of the anilox roll is much higher than that of general offset and offset rubber rolls. Therefore, only the high-precision anilox roller can guarantee the printing quality of the product. For this reason, care should be taken to make a suitable anilox roll. The angle of the cell edge of the anilox roll is 90. The corners are most prone to cracking or wear and cause the phenomenon of "trenches". For this reason, it is advisable to make the edge angles of the net holes into rounded corners, which can reduce the damage of the net holes. On the other hand, according to the characteristics of the printing layout, the use of anilox rollers is a reasonable choice. Choosing the right number of anilox roller will help prevent the “groove†phenomenon of the anilox roller caused by the unsuitable roller pressure. Generally, the density of the dot space of the anilox roller is four times that of the flexible version dot line. In addition, note also when making anilox rollers
Intended to use the appropriate shape of the cell. The hexagonal table shape has a large opening angle, which is easy to transmit ink and ink, and the partition wall between the cells has high strength and can better resist the friction force of the scraper, reduce the degree of wear of the net holes, and avoid the occurrence of "ditches" on the roller surface. Slot phenomenon.
A: The conventional letterpress and lithographic multicolor printing equipment, which consists of ink fountain roller, ink transfer roller ink roller, and ink roller, needs dozens or even dozens of ink rollers. Infusion requirements, however, the inking system cannot achieve a constant ink supply. The short ink path ink supply device of the flexographic printing press can achieve a uniform and stable ink supply through a constant supply of ink through the anilox roll. It can be seen that the anilox roller is a very important component of the flexographic printing press. Maintaining the surface of the anilox roller and the integrity of the mesh is an important part of achieving normal and uniform ink supply and ensuring the quality of the printed ink.
However, due to the "grooves" appearing on the surface of the anilox roll, it will directly affect the uniformity of the ink toward the layout. The so-called "trench" refers to the surface of the anilox roller horizontal or vertical one or more depressions appear damage marks. Once the “groove†appears on the surface of the anilox roller, it will affect the normal and quantitative normal ink supply and ink deposition, which is also the cause of streaks on the printed page. It can be seen that the “groove†marks of the anilox roller can be avoided to ensure the ink quality of the product. After thinking and analyzing, the author thinks that the reason why the anilox roller produces "grooves" may be related to the following situations.
The bad phenomenon caused by excessive roller pressure
Maintaining a uniform and moderate roll pressure is a reliable guarantee for preventing the surface damage of the anilox roll. However, if the ink supply is not normal due to the mismatch between the anilox roller cable and the printing plate surface structure, the degree of abrasion of the anilox roller may be aggravated due to the mis-rolling pressure. Therefore, the pressure between the anilox roller and the plate roller must be carefully adjusted. If the contact pressure between them is too heavy, the ceramic layer on the surface of the anilox roller can be easily damaged, and the edge of the mesh cavity can be cracked to form a groove. "In order to prevent this from happening, each time after loading, correct the difference between the anilox roller and the plate roller, and use a slight resistance when pulling, so that between the anilox roller and the plate roller, The pressure is adjusted to the parallel state and the contact pressure is maintained uniform.
Anilox roll aging problems
If the rollers of the anilox roller are eccentric or the spindle head and the connector are worn or loosened, the anilox roller can easily contact with the blade or the plate roller during the rolling process. This will cause scrapers and nets. The abnormal wear of the roller, which in turn causes one or more "grooves" on the surface of the anilox roller, should be checked and targeted repair measures must be taken to eliminate undesirable phenomena and improve the accuracy of the anilox roller. .
Bad phenomenon caused by improper maintenance of anilox roller
Ultrasonic cleaning of the anilox roller is to immerse the anilox roller in the tank of the ultrasonic cleaning device of the chemical cleaning solution. The frequency conversion device in the tank emits high-frequency sound waves, so that the solution vibrates and generates bubbles and impact forces, so as to achieve the purpose of cleaning. The anilox roller is cleaned in high frequency ultrasonic vibration for a long time. The ceramic on the surface of the anilox roller is easily damaged and forms a "trench" phenomenon, so it is necessary to grasp the proper cleaning time. In addition, if the roller is disassembled and installed, if it is not careful, it can easily scratch the surface of the anilox roller and cause a "trench" phenomenon. Therefore, it is necessary to carefully maintain and maintain the anilox roller. Care must be taken when disassembling and installing the anilox roller. Unused anilox rolls should be placed on a shelf to prevent deformation. For long-timeless anilox rolls, it is best to protect the roll body with a protective cover. When the anilox roll is sent to a remote site for processing, it must pay attention to packaging well to prevent it from being subject to severe vibration or wear and deformation.
Scraper misadjustment or presence of defects Squeegee is a consumable part. After a certain period of use, the scraper will inevitably wear out, making its working surface uneven, and it is easy to make the longitudinal part of the anilox roller scraped into a “trenchâ€. In addition, if the squeegee device is loosened or tremors, it may easily aggravate the abrasion of the anilox roller and the degree of friction of the anilox roller. Therefore, the worn scraper should be processed and ground in time. If the squeegee has an abnormal phenomenon of loosening, it should be taken to eliminate the corresponding technical measures to ensure its normal use. When using a squeegee, attention should also be paid to aligning the contact surface with the anilox roller in parallel. The pressure should be reduced as much as possible, as long as the excess ink on the surface of the anilox roller can be scraped off, and the angle of the anilox roller is also required. Adjust it so that it effectively reduces the chance of wearing the anilox roller creating a "trench".
Technology measures to prevent "grooves" from appearing in the anilox roll
The characteristics of the flexographic equipment and process have determined that the accuracy of the anilox roll is much higher than that of general offset and offset rubber rolls. Therefore, only the high-precision anilox roller can guarantee the printing quality of the product. For this reason, care should be taken to make a suitable anilox roll. The angle of the cell edge of the anilox roll is 90. The corners are most prone to cracking or wear and cause the phenomenon of "trenches". For this reason, it is advisable to make the edge angles of the net holes into rounded corners, which can reduce the damage of the net holes. On the other hand, according to the characteristics of the printing layout, the use of anilox rollers is a reasonable choice. Choosing the right number of anilox roller will help prevent the “groove†phenomenon of the anilox roller caused by the unsuitable roller pressure. Generally, the density of the dot space of the anilox roller is four times that of the flexible version dot line. In addition, note also when making anilox rollers
Intended to use the appropriate shape of the cell. The hexagonal table shape has a large opening angle, which is easy to transmit ink and ink, and the partition wall between the cells has high strength and can better resist the friction force of the scraper, reduce the degree of wear of the net holes, and avoid the occurrence of "ditches" on the roller surface. Slot phenomenon.
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