Print quality
If both UV flexo printing and gravure printing can achieve excellent printing quality, then UV offset printing provides "barrier-free" to meet the quality requirements. The quality of UV offset printing is achievable globally. Sheet-fed UV offset printers have high-quality printing machines in every corner of the world. Moreover, it is not difficult to attach a replication workshop in the factory.
The printing quality is no longer affected by the quality of the attachment (such as the dot capacity of the anilox roller, the hardness of the liner tape, the release of the resin printing ink, etc.). Because every link in the production chain is standardized, no matter which manufacturer needs to spend a small amount of resources, the result is that the print quality is predictable around the world.
Since most printing colleges still focus on UV offset printing as the main course, the operators of UV offset printing machines all have a good printing education foundation. In this way, the factory can replace or increase the production capacity with little training cost.
Process control
The standard of UV offset printing has been deeply rooted in people's hearts, which allows the supply and demand sides to establish a common understanding basis. Control can be carried out in the entire production process, that is, from the source file to the final printing result. The interpretation of quality cannot be arbitrarily defined, but should be explained by common regulations. [NextPage]
UV offset printing costs are lower
Consumables
Because the single-sheet UV offset printing technology is widely used, the price of its consumables is significantly lower than that of UV flexo printing and gravure printing. Some special varieties, such as printed plates, may cost only one-tenth of the latter under the same printing quality, which has obvious advantages in short-run work.
operating
It is easy to install printing plates in UV offset printing, and the printing plates can be used repeatedly. The printing plate is clamped by the mechanical device at the predetermined position of the plate roller, so the error is greatly reduced, the time and technical requirements are also very small, and there is no additional cost, such as adhesive tape.
It is also easy to print spot colors in a four-color combination. Because UV offset printing has been standardized, color matching can be done when separating colors. For some special spot colors, UV offset ink suppliers will use global standards (Pantone, Brunner, ISO, etc.) for color matching. Since all ink suppliers use standardized procedures and accuracy of operation, the waste of ink is greatly reduced. Unlike flexo and gravure printing, the UV offset printing process allows some flexibility in the ink-feeding process. The ink path can be divided into several sections and the ink flow can be adjusted. Advanced UV offset printing units like XpanndTM allow complete control of the ink flow. Therefore, the printing effect can be precisely adjusted, so that the most accurate printing quality can be achieved with the least amount of work. [NextPage]
UV offset printing is a rapidly developing technology
In the competitive process of digital printing, flexo printing and gravure printing, UV offset printing is constantly releasing new technologies, which can also greatly promote narrow web printing.
Plate making technology
UV offset printing has been made directly by computer for many years, and has become a recognized standard. Computer direct printing has also been around for nearly a decade, making UV offset printing profitable in short-run work. The next development direction will be the computer directly making reusable printing plates so that it can compete with digital printing in micro printing.
Color control
Online color control is a recognized function of a single sheet of UV offset press. The flexibility of modern UV offset printing units like XpanndTM in ink management and the already mature color standards make online color density control possible. The automatic color adjustment function based on internationally recognized standards can achieve truly closed production. [NextPage]
Comparison of offset printing and flexo printing
The difference between UV offset printing and UV flexo printing is mainly reflected in the ink path, ink and plate technology. Due to the long ink path, UV offset printing requires a little more automatic control of the ink feeding process, which can include up to 16 ink rollers, dampening systems, and ink tanks. UV flexo printing only requires relatively simple manual adjustment, because its ink path is based on a single ink roller (anilox roller).
On the other hand, especially for printers seeking higher quality, the use of digital imaging plates, high-quality adhesive tapes and inks also makes UV flexo production costs significantly higher than UV offset printing. Both UV offset printing and UV flexo printing have their own advantages and disadvantages in special printing requirements. Obviously, there is no ultimate "winner", only the most appropriate process to meet different needs. Below, we provide some basic comparisons, including some of the most common problems in the printing and packaging industry.
Printing range
In terms of printing range, UV flexo printing has significant advantages compared to UV offset printing. It can be glazed, printed in metallic colors, can transfer 1 to 12 microns of ink layer, and can almost simulate the tactile effect of screen cylinder printing. At the same time, it can print very fine gradient colors. UV offset printing ink transfer is limited to about 2 microns, so its high-quality printing advantages can not be extended to all printing jobs.
Ink color conversion
Due to the short ink path, UV flexo printing can be changed faster than UV offset printing. Modern UV offset printing units such as XpanndTM can also automatically clean multiple sets of printing units, greatly reducing the replacement time.
Self-visibility
Compared with UV offset printing, UV flexo printing can provide better self-visibility, especially in bright colors, strong solid colors, and strong contrast colors (contrast colors). In high-gloss areas, UV offset printing has certain advantages, because the smooth printing effect of UV offset printing is recognized by customers.
Printing process
Compared with UV flexo printing, the strong advantage of UV offset printing is not in the gap in printing quality, but in meeting the quality requirements more simply and economically. For those jobs with strict quality requirements, the platemaking source for offset printing is easier to find and the printing variables are more standardized. [NextPage]
standardization
UV offset printing has long been entrenched in global standards, while UV flexo printing mostly relies on local standards. Both printing methods can get similar printing results, but the application range of UV offset printing is wider and the cost is lower.
Short version printing: new job
The modern UV offset printing group can provide a fast conversion printing combination, adjust the ink at a low speed, and quickly adjust the ink according to the substrate, making UV offset printing and UV flexo printing in the conversion of new jobs almost the same in terms of substrate and time loss . Although UV flexo printing has the advantage of a shorter ink path, the ink supply management of UV offset printing is more flexible. If the UV flexo process has been standardized locally, then the two are similar. Otherwise, UV offset printing can have a clear advantage, because its standards are global, and its final printing results are also predictable on a global scale.
Flexo printing has advantages when printing colors are frequently changed, and when printing materials are unknown, because the UV offset printing group needs to coordinate the water-ink balance and UV flexo printing can start printing in real time. UV offset printing has certain advantages in dealing with unknown spot color printing, because it has achieved the most advanced standardization in the supply chain.
Short version printing: repetitive jobs
Modern printing machines such as AthenaTM, I-CombatTM and XpanndTM are equipped with computer intelligence technology in a global or regional standardized environment, making UV offset printing and UV flexo printing equally effective in repetitive jobs, because most of the variables are already Controlled by the computer.
In some simpler configurations, UV flexo printing has obvious advantages because of its short ink path and stable ink supply to the anilox roller.
limitation
The limitation of UV offset printing is that the repeat length size is not flexible enough because of the high price and large size of the printing group. Although the actual experience of label printers has shown that the use of 4 to 5 sets of repeating lengths for rotary machines is sufficient to cover most of today's needs. However, flexo printing can print any repeat length size, the investment cost is very small.
The limitation of UV flexo printing is printing on rough surfaces such as wine label paper or recycled cardboard, because it uses direct printing technology. UV offset printing can be printed on any substrate without increasing production costs. [NextPage]
Why use wet offset printing, waterless offset printing
Wet offset printing is the most common printing process in the printing industry today. The basic principle is to use the water-ink balance of the printing area (printing ink) and non-printing area (water) on the printing plate. The key is to maintain the stability and control of ink and water balance.
Waterless offset printing uses a silicon coating on the printing plate as a non-printing area, removing water and ink balance control, and eliminating the use of water as a medium.
Print quality
Printing without water makes the printing dots of waterless offset printing sharper and better performance. Waterless offset printing has the ability to achieve higher line counts and contrast.
Printing durability
Wet offset printing is more compatible than waterless offset printing. Water can be seen as a cleaning function for printing plates and ink paths, a bit like a self-cleaning function during printing.
In the waterless printing plate, dust and paper dust will damage the silicon coating of the waterless offset printing, making the selection of the substrate and the cleaning requirements of the working environment more demanding.
In general, waterless offset printing requires more demanding printer maintenance and operator skills. Even with a slight error in the process, the print quality may also vary greatly. The problem of ink temperature, although after years of technological development, waterless offset printing is still a very complicated process. Each process requires perfect control in order to achieve high printing quality.
Claim
When the printing speed is higher than 150 meters per minute, wet offset printing requires cooling rollers to cool the heat accumulated in the printing group, which may affect the performance of the ink and the density of the ink.
Waterless offset printing requires a cooling roller to cool the ink path at any printing speed, as well as cooling the printing plate in the center of the plate roller, because the temperature of the printing ink is extremely sensitive to controlling the printing quality. The working temperature of printing ink is limited to a very narrow range, only 3 ~ 4 ℃. Depending on the supplier, above or below this temperature, the printing ink will become unstable and the printing quality will be affected. In order to achieve better control of printing results, air conditioning temperature control is required in the factory. [NextPage]
Consumables
There is only one supplier of waterless offset printing plates, not many ink and ink suppliers. The suppliers of wet offset printing consumables are actually numerous.
Consumables cost
Because waterless offset printing is not much in the industry, the cost of consumables is significantly higher than that of wet offset printing. In some cases, the price of inks and plates can be three times higher.
Waste products during commissioning
The waterless offset claims that it does not need to deal with the balance of water and ink, so it can reduce machine waste. On the other hand, modern wet offset printing can automatically adjust the ink supply and water treatment, which also makes the control of water and ink balance more accurate and faster, which is comparable to waterless offset printing. In fact, the process of controlling the ink supply will largely affect the performance of wet offset printing and waterless offset printing.
Printing on plastic substrates
Because there is no water, waterless offset printing can achieve good printing results in a short printing turnaround time, provided that the conditions such as temperature and cleaning must be met, and the basic parameters have been correctly set.
For substrates that do not understand, wet offset printing still needs more time, and more waste products are generated. When repeating the same printing job on a known substrate, the advanced offset printing unit can store the existing ink parameters, and can perform repeated printing. Its preparation time is shorter, which is similar to waterless offset printing.
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