In recent years, people's calls for environmental protection printing have become higher and higher, especially the environmental protection printing requirements for food and medical packaging, which have been promoted to the scope of health policy. Flexographic printing, which has always been known as "green environmental protection printing", has attracted more and more attention.

Due to the characteristics displayed in the production process and product environmental protection of flexographic printing, it is increasingly adopted by the majority of food packaging and pharmaceutical packaging manufacturers. So many manufacturers raised the question: how to improve the printing quality of flexographic printing plates? How to make flexographic printing comparable to offset printing and gravure printing?

There are many factors that affect flexographic printing, which has led some manufacturers to go into one of these misunderstandings.

Flexographic printing needs to be realistic, and good printing quality must be considered in many ways.

Plate

The precision and compatibility of plate making are the primary factors affecting the quality of flexographic printing. There is already a digital version, and the accuracy of plate making has been greatly improved. Kodak plate material has been able to be compatible with different levels of transition requirements from 95% to 2%; the traditional version can also achieve more than 150 lines / inch of fineness. Of course, prepress processing is also very important and cannot be ignored. For example, in pattern design, it should avoid the appearance of some highlight areas as much as possible, because too thin highlight points will be worn in a short time, resulting in the appearance of white defects.

Therefore, excellent prepress processing is actually the mother of excellent printing quality. Only on the premise of ensuring excellent pre-press processing, high-quality plates can better play its role.

Ceramic anilox roller

The quality of the ceramic anilox roller is also an important factor that directly affects the quality of flexographic printing.

Many manufacturers say: we can also make anilox rolls, and it is very cheap. Of course, it is not difficult to make one or two well, but not every manufacturer can do it well. There are only three or four factories in the world that can steadily and perfectly complete each anilox roll.

So, what kind of ceramic anilox roll is excellent?

First of all, the roundness of the roller body processing ability, this is not what the average manufacturer can do very well. Many users fall into this misunderstanding: thinking that the surface is like a ceramic roller, it feels no problem. But in fact, have they really tested whether its roundness meets the requirements? If there is no way to meet the requirements, what are the conditions to talk about high-quality printing effects? Not to mention anything comparable to offset and gravure printing!

Secondly, the anti-corrosion treatment of the roller body is also very important. Because water-based inks are acidic and highly corrosive. Some ceramic rollers are processed well, but the anti-corrosion ability does not meet the requirements, so it is not an excellent product. If you want to improve the corrosion resistance of ceramic anilox rollers, not only the base roller should be handled well, but also high density requirements when spraying. The quality of ceramic materials is critical. Cheap and inferior ceramic materials often fail to meet the requirements, and high-quality products cannot be printed.

Furthermore, the parameters that really affect the printing quality are the number of lines and the amount of ink carried by the ceramic anilox roller. Many people know that the higher the line number, the more suitable for high-quality printing, but the high line number means that the amount of ink is not enough to express rich printing colors. Therefore, anilox rollers with high line count and large ink volume can really cooperate with high-quality flexographic printing, and both are indispensable. There are not many manufacturers who can really achieve anilox rollers with high thread count and large ink volume.

To have a high-quality printing effect, we must really pay attention to the quality of the anilox roller and its important role in printing, and then talk about high-quality printing effects.

scraper

Many people think that the metal scraper will damage the ceramic anilox roller, which is a misunderstanding.

With ceramics so hard, how could it be so easily scratched? In fact, if there is no artificial tapping, the ceramic will not be damaged. Scraping the ink of the ceramic roller is just like the ink of the gravure printing. Clearly scraping the excess ink is the guarantee of high-quality printing, so we should prefer the metal scraper. Excellent scrapers should have good elasticity and high precision, and some also have anti-corrosion properties. For example, the performance of Italian CBG gold scrapers in flexographic printing is more prominent and can fully meet the requirements.

double-sided tape

Excellent double-sided tape must have stable viscosity. Many manufacturers believe that the sticky tape is very good, which is a misunderstanding. Because too strong adhesive tape will cause a lot of residual glue, unloading is very difficult. In particular, there are times when there is a problem with the registration, and you need to re-post it. If the adhesive tape is very sticky, causing a lot of residual glue, it will seriously affect the effect of re-sticking, and even pull the version. The quality of the applied flexographic printing products is almost comparable to that of offset printing. It is said that double-sided tape is not as strong as possible. The excellent double-sided tape should have a strong initial viscosity, and the trend will be after a certain strength Stable, so that it will be easy and easy when you unload the version.

To make high-quality printing, a layer of foam with average thickness, uniform hardness and good elasticity should be used as the base layer. Among them, the text and the integrated version are relatively hard; the layered and gradient version is relatively soft. In addition, the release paper is a surface with a concave-convex feeling, and it is easy to drive off the bubbles when affixing the plate. German Lohmann double-sided tape is one of the excellent brands.

Sleeve

For flexographic printing, the most advanced model is a satellite wide format printing machine, such as Uteco in Italy. Only this type of flexographic printing machine can achieve the highest precision registration, tending to zero pressure. Only in this kind of machine can flexographic printing have the opportunity to print the effect that is closest to offset printing and gravure printing, and can really have the opportunity to replace offset printing and gravure printing. When printing easy-to-stretch materials, this type of flexographic printing machine shows unparalleled advantages.

Satellite flexo printing machines are usually equipped with inflation shafts, and sleeves are used. Since there are not many manufacturers producing sleeves, there are relatively few misunderstandings. However, we recently encountered some customers. Due to the aging of the equipment, the system air pressure was insufficient, and some suppliers misled them: the lack of air pressure can increase the inner diameter of the sleeve a little bit, and it does not need too much air pressure. In fact, this approach is wrong, they simply misunderstood the benefits of the sleeve. The correct method is to make the inner diameter of the sleeve a little smaller. When installing, the air pressure is a little bigger, and then the sleeve is enlarged and the sleeve is stabilized. After the gas is retracted, the sleeve returns to the original inner diameter and the sleeve is tighter. The stability in is good. If the inner diameter is large, the sleeve is easy to slip if it is not tight, the positioning pin will be worn quickly, and new sleeves need to be replaced frequently, thereby increasing more costs. The most important thing is to affect the printing speed and printing quality.

An excellent sleeve should have high accuracy, high roundness, good elasticity of the cylinder base, uniform surface treatment, uniform hardness, and the cylinder wall should not be too thick. If the diameter of the inflation shaft is insufficient, a larger inflation shaft or a sleeve-type inflation shaft should be used. The biggest advantage of the printing sleeve is to quickly change the plate roller, replace the anilox roller, and enhance the flexibility of the flexographic printing machine. It can not only do long version work but also short version work, and can also easily retain the version.

The most advanced technology now is the shock-absorbing sleeve and anti-static sleeve to match the printing speed of the satellite machine up to 600 meters / minute, or to match the printing with solvent ink. German Polywest sleeve is an excellent brand belonging to this category.

Air cushion liner

At present, the level of flexographic printing presses used for carton direct printing is already very high, and the flexographic printing plate has reached an ultra-thin version of 2.84mm. The direct-printed carton should be added with a high-elasticity air cushion liner after the printing plate. The best currently is the R-bak bottom liner of the US Rogers. But in use, many people have a big misunderstanding-anti-install R-bak.

The design of R-bak is used to thicken the printing plate to reach the printing gap designed by the original machine, and increase the flexibility of the printing plate material, reduce the dot spread and the pressure of the printing plate on the corrugated paper, so that the highly elastic printing plate material can be fully Print to every place on the uneven corrugated cardboard surface that needs to be printed. However, these three functions can only be fully utilized when R-bak is installed. That is to say, the original R-bak design must paste each flexible version on an R-bak with a larger thickness and a larger area No film is added in the middle, and the flexible plate is directly covered by R-bak. R-bak imitations are also appearing on the market. The color and appearance are similar. The feature is cheaper, which attracts many manufacturers to use. Indeed, if counterfeit products and genuine R-bak products are used in a reverse way, the effect of the two is not much different, so customers will not care. But if you use R-bak in the right way, you can distinguish between genuine R-bak and counterfeit goods. R-bak works very well. Correct selection and use can really improve the printing quality. In summary, it is not impossible to improve the quality of flexographic printing, comparable to offset printing and gravure printing. As long as the vast majority of flexographic printing supporters start today, choose high-quality flexographic printing materials correctly, use these high-quality materials correctly, and cooperate with the ever-changing high-tech equipment, flexographic printing will catch up with offset printing and gravure printing just around the corner.

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