Discussing the Difference Analysis of UV Printing Quality (I)

Summary
As the island's printing production methods, inks, and technologies are changing with each passing day, and then taking into account the future trend of environmental protection, it is necessary to consider high-speed, high-quality, and non-pollution on the printing press. Therefore, this article is aimed at UV inks. In addition to inks, this article also discusses the interrelationship between printing presses and dryers to find out the most appropriate quality assessment of the printing process.
Preface
With the advancement of printing technology, the printing quality is gradually becoming faster. However, in the process of speeding up, some problems occur, such as drying. UV inks have better drying conditions than other conventional inks, so they can be printed in a wide range of materials and UV inks can be used in various formats. In view of this, UV inks will occupy a large seat in various inks in future printing trends. Because UV inks have a wide range of applications, the two types of layouts are discussed in view of the speed of rotation lithographs, the large amount of production, and the wide range of printed materials for screens. How to get the most suitable quality [Figure 1] must be analyzed with the cost, quality, and product value.

Figure 1

贰 贰 UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV UV 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、. Until 1960 oil was successfully developed by a British company. UV inks were not initially appreciated because of the fast drying and solvent-free all-solid components that UV inks emphasize. At the time, there were no better conditions than other inks. However, UV inks are very popular on the screen. Because of the screen printing, its printing speed is not faster than that of other types of printing. Strictly speaking, the difference is large, and the printed ink film is particularly strong. Naturally, the time required is longer. The main reason is “solvent”. This thing. And the disadvantages of the solvent in the screen, such as the ink plug the network can not be printed, only due to the relationship between the solvent evaporated in the mesh; ink is too hard to print and the ink is too thin and can not be printed, are caused by solvents . In short, the problems brought about by the "solvent" in the industry will be very nerve-racking. Therefore, the two major characteristics of UV ink to solve the problems plagued by screen printers, and the industry still think UV ink development is too slow.
Second, the characteristics of UV inks [1] simple and less inventory: the new UV ink only has to be able to mix the four basic colors required, and its printing ink film thickness is thin, the amount of ink required is reduced, it is very simple Therefore, inventory can be reduced.
[2] Opacity Easy to control: The pigments or pigments can be added to the extension to achieve your desired brightness in a standard ratio.
[3] Color matching ability: The pigment added to the stretching group can be given an appropriate viscosity, hue and lightness, and can be provided with an extremely rich color, so long as two or more basic colors are mixed to obtain various desired colors.
[4] Ink saving: Since the composition contains no solvent, only one-third to one-half of the traditional one is needed, and the desired effect can be obtained with the ink volume.
[5] The ink roller and the printing plate are not blocked: Unirradiated ink, even if it can not be dried for at least 48 hours on the ink roller or printing plate, there is no need to worry about the crust on the roller or the plate is blocked .
[6] Provincial ink: Only three quarters to one-fifth of the traditional ink hot stove can be dry.
[7] Gloss: The gloss of UV inks is very good, and special treatment can also be used to achieve special effects.
Third, UV ink and traditional ink comparison UV ink and traditional ink the biggest difference, can be regarded as its constituent molecules. It is an all-solid-state tissue form and contains no solvents. And its media, pigments, resins and other chemicals are different from traditional inks. Traditional inks contain solvents [40%–60%], which require the solvent to completely evaporate before leaving a dry film of ink that is made up of blending agents, pigments, and additives. UV ink pigments and resin systems, unlike conventional inks, do not have such high brightness and opacity.
Fourth, the advantages and disadvantages of UV ink UV is a type of electromagnetic wave, and UV ink is the use of UV radiation energy to achieve its drying effect. There are many types of UV dry-solid systems, but the principle is based on the chemical reactions caused by the sensitizer's absorption of high-intensity ultraviolet light [UV]. The sensitizer is a chemical product with special reaction ability, which can convert light energy into chemical energy and instant solidify different mixtures. But the most important point is that the energy of the UV light used is 600 times that of the home fluorescent lamp, so it will not dry immediately due to sunlight in the environment.
[1] Advantages 1. Volatile Organics: Most UV products contain little or no organic solvent.
2. To improve the quality of finished products: Through the crosslinked structure of polymers, not only is it highly tough [Toughness], but it is also anti-fouling [stainresistance] and anti-abrasion [abrasionresistance] And the characteristics of solvent resistance [Solventresistance].
3. Low energy demand: The energy consumed by a typical radiative solid-state production line requires only 25% of the energy required for drying with heat energy.
[2] Disadvantages 1. Dryness due to "line of sight": UV products usually only dry under UV irradiation.
2. Difficulties in dry solids containing pigment systems: UV has difficulty penetrating thicker and pigmented coatings. In general, only EB has a good effect. Recent research and development in chemical and light energy have improved the effect of UV on the product.
3, raw material prices are too high: the current high prices of raw materials is due to the market is small, coupled with high research costs, resulting in product unit prices higher than the traditional products. It should be noted here that UV products are 100% solids, unlike traditional inks, coatings and adhesives containing volatile solvents.
4, dry solid equipment [curingunit]: high cost of basic equipment investment prices.
5. Possible hazards of UV products: Most UV products can be considered skin irritants before they are dried. However, these products, due to their low volatility, can reduce such problems if they can maintain the habit of wearing skin care gloves and goggles during operation.
6, poor adhesion: In general, compared with traditional products, some materials, including steel and aluminum sheet poor adhesion, for chemical improvement and post-baking treatment [post-Baking] Can eliminate some of the problems of poor adhesion, but also reduce the stress caused by shrinkage in the dry process.