Analysis on the difference of UV printing quality

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Discussion on the difference analysis of UV printing quality (I)


due to the rapid change of printing production mode, ink and technology in the island, and considering the future trend of environmental protection, it is necessary to consider high-speed, high-quality and pollution-free in the printing press, so this paper discusses UV ink. This paper not only discusses the ink, but also discusses the relationship between the printing machine and the dryer to find out the best quality evaluation of the printing process

1. Preface

with the progress of printing technology, the printing quality is gradually moving towards rapidity. However, in the process of rapid development, some problems occur, such as drying. UV ink has better drying conditions than other traditional inks, so it can be used in a wide range of printed materials and various formats. From this point of view, in the future printing trend, UV ink will occupy one of the largest positions in various inks. Due to the wide application range of UV ink, this paper discusses the two types of rotary lithography, which have high speed, large production capacity and a wide range of printed materials. How to effectively obtain the optimal quality [figure 1] must be analyzed with cost, quality and product value

Figure 1

2. The origin of UV ink

1. The development history of UV ink

the idea of using ultraviolet light to irradiate the ink and make it completely dry and harden in just a few seconds was put forward in 1994. Until 1960, oil was successfully developed by a British company. UV ink was not paid attention to at first, because UV ink is characterized by fast drying and solvent-free all solid components. At that time, compared with other inks, there was no better condition. But UV ink is very popular. Since the printing speed of plate printing is not faster than that of other formats, strictly speaking, there is a large difference, and the ink film printed is particularly thick, which naturally takes a long time. The main reason is the "solvent". And the solvent in the version of the shortcomings, such as the ink plug can not be printed, only because the solvent evaporates in the eye; The ink is too hard to print and the ink is too thin to print, which is caused by solvent. In a word, the problem brought about by "solvent" will be very troublesome. Therefore, the two characteristics of UV ink solve the problems of printing industry, and the industry also thinks that the development of UV ink is too slow

II. Characteristics of UV ink

[1] simplicity and low inventory: the new UV ink can be mixed into the required color only by having four basic colors, and its printing ink film thickness is thin, so the amount of ink required is reduced, so it is very simple, so the inventory can be reduced

[2] the opacity is easy to control: you can add pigments or pigments in the extension base according to the standard proportion to achieve the brightness you want

[3] color matching ability: when pigments are added to the extended base, appropriate viscosity, hue and lightness can be obtained, and extremely rich colors can be prepared. As long as two or more basic colors are mixed, various desired colors can be obtained

〔 4 〕 the actual operation of ink is carried out according to the microcomputer automatic control system. The amount of experiments is saved: because its components do not contain solvents, it only needs between one-third and one-half of the traditional amount of ink to achieve the desired effect

[5] the inking roller and printing plate are not blocked: the unexposed printing ink will not dry even on the inking roller or printing plate for at least 48 hours, so there is no need to worry about scaling on the roller or blocking of the printing plate

[6] save ink: only three quarters to one fifth of the electricity charge of the traditional ink hot blast stove can be dried

[7] gloss: the gloss of UV printing ink is very pleasing, and it can also be specially treated to achieve special effects

III. comparison between UV ink and traditional ink

the biggest difference between UV ink and traditional ink is its constituent molecule. It is the protection and maintenance of all 2. Bellows ring stiffness testing machine. It has a solid organizational form and does not contain solvents. And its media, pigments, resins and other chemicals are different from traditional ink. Traditional inks contain solvents [40% - 60%]. Only after the solvents are completely evaporated can the dry film of inks made from the mixture of conditioners, pigments and additives be left. The pigment and resin system of UV ink is not as bright and opaque as traditional ink

IV. advantages and disadvantages of UV ink

uv is a type of electromagnetic wave, and UV ink uses the radiation energy of UV to achieve its drying effect. There are many kinds of UV drying systems, but their principle is the chemical reaction caused by the absorption of high-intensity ultraviolet (UV) by the photosensitizer. Its photosensitive agent is a kind of chemical product with special reaction ability, which can convert light energy into chemical energy and make different mixtures solid instantly. But the most important thing is that the energy of UV light used is 600 times that of household fluorescent lamps, so it will not dry immediately under the environment due to sunlight

very high requirements for product quality [1] advantages

1. No volatile organic compounds: most UV products contain little or no organic solvents

2. Improve the quality of finished products: the composition structure produced by high-density crosslinked polymer not only has a high degree of toughness, but also has the characteristics of stain resistance, abrasionresistance and solvent resistance

3. Low energy demand: a typical radiation drying production line consumes only 25% of the energy required for thermal drying

Among them, 80% of the production capacity is lithium copper foil

[2] disadvantages

1, "line of sight" drying: UV products usually only dry under direct UV irradiation

2. Difficulty in drying and fixing pigment containing systems: UV has difficulty in penetrating thick and pigment containing coatings. Generally speaking, only EB has a good effect. Recent research and development in chemistry and light energy has improved the effect of UV on products

3. The high price of raw materials: at present, the high price of raw materials is due to the small market and the high amount of research costs, resulting in the unit price of products being higher than that of traditional products. It should be noted that UV products are 100% entities, unlike traditional inks, coatings and adhesives that contain volatile solvents

4. Curing unit: the cost is too high and the investment price of basic equipment is high

5. Possible dangers of UV products: most UV products can be regarded as skin irritants before drying. However, due to the low volatility of these products, if the habit of wearing skin care gloves and eye masks can be maintained during operation, such problems will be reduced

6. Poor adhesion: Generally speaking, compared with traditional products, some materials, including steel sheets and aluminum sheets, have poor adhesion. Chemical improvement and post baking can eliminate some problems of poor adhesion and reduce the pressure caused by shrinkage during the drying process

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