For the anilox roller, there have been many new developments. However, only by making basic adjustments to the printing process can we see the good results of this new change.
Flexo printers hope that they can have a certain advantage. Printing press and accessory manufacturers have also been advocating the power of their new technology improvements. But if we don't pay attention to the basics, all these new technologies will not bring us the imaginary results.
Let's explain below, what is the basic work? That is, under what circumstances the system needs to be fine-tuned?
——When the rubber nip rill is used instead of the doctor blade, this technique cannot accurately control the thickness of the ink layer on the anilox roller.
——When the pH value or ink viscosity (two key factors affecting the fluidity of the ink) is not monitored, the color density will shift.
——When the gear of the transmission device used is worn by strength, it will cause unstable ink transmission.
——Loose or worn bearings will also cause pressure instability between dust plates.
——Due to repeated loading and unloading, the flexible plate is stretched and deformed.
——We can't think that an 800lpi anilox roller with 200 billion cubic micrometer meshes formed at a 60-degree angle will produce the same ink transfer performance as the 120 million cubic micrometer anilox roller formed at a 30-degree angle. .
——Broken and clogged anilox rollers have an ink transfer performance that is clean and intact. Even under the same engraving data, the ink transfer performance will be different.
All process variables must be correct, so that when we use new technology, we can see the advantages brought by the new technology. Moreover, the requirements for printing quality must correspond to the cost and workload, otherwise there will be situations where the staff insists on their past experience.
FM network technology and hybrid screen technology (the traditional screen with FM is still a long process to be widely used, so the traditional screen technology still accounts for a large proportion when used. If It is too early to consider the use of FM networks, but if printers can use new technologies consciously and systematically, they will have a great advantage in future competition.
Anilox roll manufacturers are always trying their best to develop engraving rolls with higher thread count. When the number of screen lines on the user's version reaches more than 150lpi (even more than 200lpi), the minimum number of anilox roller lines established has reached 800lpi, and it is recommended that if an anilox roller of 1000, 1100, 1200lpi is used, better results .
Over the past 20 years, 800 lpi has been the limit of laser technology and control technology. Only in the last few days has this limit of engraving lines been broken.
The benefits of the new engraving technology are very obvious. The engraving roller with a higher number of lines can support smaller and brighter plate dots and reduce the occurrence of dip. At the time, it will be completely immersed in the mesh, resulting in the phenomenon of ink staining around the dot, resulting in unclear layout and a large dot expansion value).
Although the production of anilox rolls can currently produce more than 2000lpi products, but few people buy more than 1500lpi anilox rolls. The anilox roller of more than 1500 lpi has a small mesh groove and a thin mesh wall. Although this kind of mesh trough can achieve very high printing quality, the ultra-fine mesh wall structure is difficult to support the currently used cleaning methods such as ultrasonic and soda water spray.
In addition to the consideration of the problem of cleaning damage, most printers only need to reach the number of such people when they meet the requirements of their users.
Generally, there are few users who use 1500lpi mesh rollers, and the increasing demand is between 900 ～ 1200lpi. But orders in this range come from high-quality printing jobs, mainly used for narrow, intermediate and wide web printing presses. If an anilox roller above 800 lpi must be used, the optimization of each ink delivery system component is a key factor.
The CO2 laser has been the standard laser generator for engraving in the industry for many years. The YAG laser is also very useful when producing fine engraving effects, because its beam is narrower and can focus on finer points; its energy is more concentrated, and it can get a cleaner mesh in the case of finer mesh walls . The basic engraving capacity of this laser is 1200Lpi; while the capacity of CO2 laser is 700lpi. Therefore, if the required ink dots are finer, this laser product can get a better color tone effect.
If the engraving technique is not considered, the thickness of the mesh wall decreases with the increase of the mesh line. If the 400lpi mesh wall is twice thicker than 800lpi, the service life of the 400lpi anilox roller will be longer and the requirements for use will be lower.
For printers who want to use flexo to obtain offset quality, it is very important to establish standards and monitor variables. The standard of the printing process includes the provisions of the anilox roller ink amount and anilox angle for each line number.
The interchangeability and estimation of the system must be strictly controlled. Once control is established, the integrity of the system must be maintained. This is to maintain the components of the printing press correctly. If we do so, we will find significant changes in printing quality, and the work done is only the basic elements and control of the printing process.
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