The flexographic direct laser platemaking technique transfers the image to the plate by laser ablation of the carbon black layer on the surface of the flexographic plate. The ablated carbon black layer corresponds to the film, so no vacuum is required for the main exposure. The ablated portion of the carbon black layer is directly exposed to the air. The free oxygen in the air passes through the plate resin exposed to the air and reacts with the photoinitiator in the resin throughout the main exposure process. A part of the photoinitiator is consumed, resulting in the partial lack of the photoinitiator that does not produce a cross-linking curing reaction, which we call an oxygen-suppression reaction.
The disadvantages of the oxygen-suppressing reaction are mainly manifested in three aspects:
1) The dot size cannot be 1:1
2) The surface of the printing plate about 10-15um resin can not complete the curing cross-linking reaction, washed away when washing
3) The top of the high light dot is circular
Let us first take a look at the shortcomings of the oxygen-suppression reaction to us what kind of adverse effects.
First of all, the fact that the size of direct laser platemaking sites cannot be copied 1:1 does not meet the habits of pre-press color correction personnel, and it is easy to bring troubles to pre-press color correction personnel when adjusting images. However, this is not the focus of this article and will not be repeated here.
Secondly, when a non-absorbable printing material such as a flexographic printing film is used, it is very easy for the ink to be covered improperly.
In order to solve this problem, ESKO has developed a micro-cell technology to increase the roughness of the surface of the plate by making some pits on the surface of the plate. The rough surface of the plate can transfer more ink, which helps to increase the density and coverage of the ink. Uniformity, to eliminate a large number of printed white spots, Figure (3) is the use of ESKO micro-cell technology printing samples, ink density and uniformity of coverage can be greatly improved. However, because the micro-cells are very fine, if the surface of the printing plate is washed away due to the effect of the oxygen-suppressing reaction because the surface-curing resin cannot complete the curing cross-linking reaction, the micro-cells cannot be produced or the micro-cells produced are not effective. .
Finally, the domes are more sensitive to the printing pressure than the flat-top dots. The printing of the dots is enlarged. Moreover, the dots of the dome are very easy to fall into the cells of the anilox roll under the action of the rotating shear force of the drum. The top of the dot is very easily cut off by the anilox roller net wall, causing the dot to be printed off.
The inhibition of oxygen in the flexo plate direct laser platemaking has had a number of adverse effects on platemaking and printing. Flexible plate suppliers and platemaking equipment suppliers have been devoting themselves to eliminating oxygen-suppressing reactions and have made progress. This is the flat top. Dot plate making technology.
At present, the flat top dot plate making technology can be divided into two categories. One is to physically isolate oxygen from the plate making process by coating the surface of the plate with barrier gas or replacing the air with inert gas. The other type is rich. The flexographic product division of the Lint Group presented the nyloflex® NExT exposure technology at the seminar in Stuttgart, Germany. By using an advanced high-energy UV light source, photopolymerization of the image area was accelerated, and the inhibition of polymerization from oxygen became insignificant. The main advantage of nyloflex® NExT exposure technology compared to other processes is that neither the risks due to the use of inert gases nor the need for additional expensive consumables. In addition, in the current standard digital process flow, it does not need to add any process steps, such as no film or film composite.
The nyloflex® NExT process can be easily integrated into existing digital workflows. The only change is that the nyloflex® NExT process requires the addition of an advanced high-energy UV light source, combined with the use of a conventional UV tube, to achieve images from A 1:1 reproduction of the black film to the plate is reproduced, and the top of the dot is a planar structure rather than a circle.
Plate printing tests made using NExT flat vertex exposure technology show its advantages in printing, such as: Flat-top dots improve printing pressure tolerance and reduce printing ink bars, with micro-cell technology on the surface of the plate The application and smaller outlets can be replicated, expanding the range of printed tones, improving the coverage of inks and the density of the colors in the field. With the use of HD high-definition flexo technology, the printing quality of flexographic products will reach a new standard.
The disadvantages of the oxygen-suppressing reaction are mainly manifested in three aspects:
1) The dot size cannot be 1:1
2) The surface of the printing plate about 10-15um resin can not complete the curing cross-linking reaction, washed away when washing
3) The top of the high light dot is circular
Let us first take a look at the shortcomings of the oxygen-suppression reaction to us what kind of adverse effects.
First of all, the fact that the size of direct laser platemaking sites cannot be copied 1:1 does not meet the habits of pre-press color correction personnel, and it is easy to bring troubles to pre-press color correction personnel when adjusting images. However, this is not the focus of this article and will not be repeated here.
Secondly, when a non-absorbable printing material such as a flexographic printing film is used, it is very easy for the ink to be covered improperly.
In order to solve this problem, ESKO has developed a micro-cell technology to increase the roughness of the surface of the plate by making some pits on the surface of the plate. The rough surface of the plate can transfer more ink, which helps to increase the density and coverage of the ink. Uniformity, to eliminate a large number of printed white spots, Figure (3) is the use of ESKO micro-cell technology printing samples, ink density and uniformity of coverage can be greatly improved. However, because the micro-cells are very fine, if the surface of the printing plate is washed away due to the effect of the oxygen-suppressing reaction because the surface-curing resin cannot complete the curing cross-linking reaction, the micro-cells cannot be produced or the micro-cells produced are not effective. .
Finally, the domes are more sensitive to the printing pressure than the flat-top dots. The printing of the dots is enlarged. Moreover, the dots of the dome are very easy to fall into the cells of the anilox roll under the action of the rotating shear force of the drum. The top of the dot is very easily cut off by the anilox roller net wall, causing the dot to be printed off.
The inhibition of oxygen in the flexo plate direct laser platemaking has had a number of adverse effects on platemaking and printing. Flexible plate suppliers and platemaking equipment suppliers have been devoting themselves to eliminating oxygen-suppressing reactions and have made progress. This is the flat top. Dot plate making technology.
At present, the flat top dot plate making technology can be divided into two categories. One is to physically isolate oxygen from the plate making process by coating the surface of the plate with barrier gas or replacing the air with inert gas. The other type is rich. The flexographic product division of the Lint Group presented the nyloflex® NExT exposure technology at the seminar in Stuttgart, Germany. By using an advanced high-energy UV light source, photopolymerization of the image area was accelerated, and the inhibition of polymerization from oxygen became insignificant. The main advantage of nyloflex® NExT exposure technology compared to other processes is that neither the risks due to the use of inert gases nor the need for additional expensive consumables. In addition, in the current standard digital process flow, it does not need to add any process steps, such as no film or film composite.
The nyloflex® NExT process can be easily integrated into existing digital workflows. The only change is that the nyloflex® NExT process requires the addition of an advanced high-energy UV light source, combined with the use of a conventional UV tube, to achieve images from A 1:1 reproduction of the black film to the plate is reproduced, and the top of the dot is a planar structure rather than a circle.
Plate printing tests made using NExT flat vertex exposure technology show its advantages in printing, such as: Flat-top dots improve printing pressure tolerance and reduce printing ink bars, with micro-cell technology on the surface of the plate The application and smaller outlets can be replicated, expanding the range of printed tones, improving the coverage of inks and the density of the colors in the field. With the use of HD high-definition flexo technology, the printing quality of flexographic products will reach a new standard.
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