Current situation and development of the hottest s

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Current situation and development of special printing technology

with the development of science and technology, new processes and materials continue to emerge, and many special printing processes have emerged. These printing processes are different from the printing of conventional books and periodicals, newspapers, picture albums, posters, advertisements, packaging materials, etc. printing professionals refer to all special processing methods that use inks with special properties, printing methods, and printing on special shapes or materials as special printing. Special printing technology is a huge printing technology group formed by the combination of the latest edge science in the long-term development process. At present, there are many kinds of special printing, with more than 60 kinds of processes. They are not only closely related to the ordinary and conventional lithography, relief, intaglio and silk printing, but also have many unique features. Common special printing methods include: metal printing, glass printing, magnetic card and smart card printing, decal printing, self-adhesive label printing, plastic film printing, concave convex printing, stereo printing, laser holographic iris printing, foaming printing, hose printing, magnetic printing, liquid crystal printing, combination printing, special gloss printing, holographic hot stamping, inkjet printing, digital printing, transfer printing, braille printing, etc, It is widely used in finance, medical treatment, health, packaging and decoration, culture and entertainment and other fields

Figure 1: classification of special printing

I. packaging printing has become the mainstream of special printing

packaging printing plays a very important role in protecting products, beautifying commodities, publicizing corporate culture, and realizing the storage, preservation, transportation, sales, use of goods. At the same time, it also beautifies people's life. However, at present, it is still the most common part of life in the food packaging industry, and the framework plays a role in commodity production The bridge between sales and consumption plays an important role in improving the added value of commodities and enhancing the competitiveness of commodities. The development of packaging industry has brought opportunities to lithography, flexo printing, gravure printing and many other printing methods. Special printing and packaging plays an extremely important role in the protection of products, anti-counterfeiting, decoration and beautification and publicity of products. In recent years, China's packaging and printing has made great progress, and packaging and printing has become the growth point and mainstream of the sustainable development of special printing. With the intensification of competition in the packaging and printing industry, packaging products tend to be multifunctional, intelligent and anti-counterfeiting. A single printing method has been unable to meet the requirements of exquisite packaging, and special printing technology is quietly rising. For example, today's popular special hybrid printing technology has grown rapidly in the packaging and printing fields such as folding cartons, anti-counterfeiting labels, and exquisite product manuals. For example, flexographic printing adds the function of silk printing to supplement its own process flow. Similarly, lithography, gravure printing, and silk printing can also be combined with flexographic printing, digital printing, and advanced post press technology automated production machines to form hybrid printing technology, Offset printing is used to print images and gradient patterns. Taking advantage of the thick ink layer and stable ink color of gravure printing or silk screen printing, large areas of field and spot colors, gold silver, pearlescent colors and various imitation metal etching inks are printed, pushing the level of packaging printing to an unprecedented level. If special surface finishing effects are needed, special printing processes such as sanding, ice flower, crystal, wrinkle, etc. can also be added. Later special processing processes such as gold sweeping, UV local glazing, bronzing, embossing, film covering, etc. make the packaging products icing on the cake and improve the main functions of packaging

second, flexographic printing is the ideal way of green special printing

at present, printing enterprises all over the world are promoting environmental protection, and have stepped up the research and development of green materials and pollution-free printing methods. Packaging is based on economic development, scientific and technological progress and the improvement of people's cultural living standards. Green packaging is the theme advocated by modern civilization. With the continuous improvement of people's awareness of environmental protection, Promote the rapid development of green special printing technology. Due to its good printing quality, a wide range of substrate materials, low investment, high efficiency, good environmental performance and other advantages, flexographic printing takes the lead in the field of packaging. It uses water-based ink, does not contain toxic organic substances, just in line with the green development trend of modern packaging and printing, and is especially suitable for the special packaging and printing of food, beverages, drugs and other items. Flexo printing can also use solvent-free UV ink, so there is no solvent emissions, no environmental pollution. Therefore, in order to achieve green printing, we must vigorously promote flexographic printing. Modern flexographic printing equipment has strong comprehensive processing capacity. Almost all narrow width unit flexographic printing machines can carry out post press processing on the same equipment, such as glazing, film coating, die cutting, punching, etc., which effectively improves labor production efficiency, saves land and reduces costs. The innovations of flexographic printing machine, such as shaftless independent drive, sleeve technology, digital plate making, automatic registration control technology, UV drying technology, direct plate making technology, make flexographic printing one of the fastest-growing special printing methods today

Figure 2: colorful packaging printing

III. silk printing is the most widely used printing method of special printing

silk printing is called universal printing. It can print on various printing materials, such as various plastics, textiles, metals, glass, ceramics and other materials. Its unique flexibility, expressiveness and innovation make it widely used in commerce, advertising, decoration, art, construction, publishing Printing and dyeing industry, electronics and other industrial fields. Silk printing products have bright color, thick ink layer and strong sense of subjectivity; The silk plate is elastic, which can be printed on curved surface, spherical surface or uneven special-shaped object in addition to plane object; Because the printing principle of the silk plate is that the ink is directly attached to the surface of the substrate through the silk hole under a certain pressure, according to the requirements of the substrate material, it can be printed with ink, as well as various paints, pastes, gums, etc; The size of silk printing is free. At present, with the rapid development of the advertising market, the proportion of large-scale outdoor advertising printing in the advertising market is increasing. It can be seen that silk printing is an innovative process, which can process a wider range of products and production capacity

Figure 3: flexible printing production line with modular design and on-line processing

IV. special printing increases the function of printing materials

special printing not only shows the ordinary printing effect, but also injects more new functions into printing products by directly printing patterns or words on various products, selecting special function printing processes, and adding special functions, so as to improve the grade of products, create brand effect, and stimulate consumption, The economic benefits of adding additional functions of products are immeasurable, and they are more and more favored by businesses and consumers. In addition to visual effects, many special printing products can also enjoy special functions through hearing, smell, touch and so on. For example, the new special gloss printing, which is popular in the printing industry in recent years, is widely used in commodity packaging, advertising posters, office stationery and so on. At present, there are mainly metal gloss printing, pearlescent printing, pearl gloss printing, refractive printing, variable gloss printing, laser holographic iris printing, Crystal Gloss printing, imitation metal etching printing and matte printing. Among them, metal gloss printing uses aluminum foil metal composite paper, which is printed with transparent ink to form a special metal gloss effect on the print. Pearlescent printing is to first print silver paste on the surface of the print, and then print extremely transparent ink. The silver flash reflects a pearlescent effect through the ink layer. Pearl gloss printing is printing with ink mixed with mica particles, which makes the printed products produce a gloss effect similar to pearls and shellfish. Refractive printing is the unique effect of light refraction by using a refractive plate to imprint the pattern on the print through a certain pressure. Matte printing adopts matte ink printing or ordinary ink printing followed by matting film, which can produce hazy weak gloss characteristics. These special gloss printing also has a relatively safe anti-counterfeiting effect. Perfume printing is to add perfume microcapsules to the printing ink, print the same fragrance as the food on the food package, and print the fragrance of various perfume on cosmetics. When the capsule is destroyed, the fragrance gradually emits. New materials and processes are also widely used in special printing, such as multi-layer labels used in the pharmaceutical industry, double-sided labels, film labels, electronic labels, in mold labels, smart labels and anti-counterfeiting labels used in the cosmetics industry, which add new functions to the original ordinary labels

Figure 4: silk printing methods suitable for various surfaces

v. special inks inject life color into special printing

with the continuous improvement of printing quality requirements, higher requirements are also put forward for inks. Today, with the rapid development of science and technology, various special inks continue to appear and are used in the field of special printing. They not only make the printing quality excellent, but also meet a variety of special needs such as environmental protection, anti-counterfeiting and so on. Therefore, the emergence of magnetic inks, fluorescent inks, photochromic inks, thermotropic inks and so on has made the development of special printing industry leap to a new height. In particular, UV ink, which has a matte texture and smooth skin touch different from ordinary nylon, is a kind of green environmental protection ink with rapid development. Compared with thermosetting and volatile drying inks, it has the characteristics of low temperature rapid curing, no volatile organic solvents, less pollution, small land occupation, high efficiency and low energy consumption. With the increase of the variety of UV curing raw materials, UV special inks with different functions and varieties have appeared. With the popularity of digital printing at home and abroad, a new type of electronic ink suitable for digital printing machines has also been used. Nano ink makes the dispersion of ink more stable, with good flow and lubricity, strong covering power and high gloss due to the high fineness of its pigment. At the same time, the particle size of the resin in the ink is fine, and the film formation is continuous, uniform and thin, so that the printed image is clearer, the color is more gorgeous and dazzling. At the same time, nano materials have special properties of self-cleaning, anti fouling, corrosion resistance, abrasion resistance and impact resistance, which are also widely used by people

Figure 5: comparison between digital printing process flow and ordinary lithography process

VI. anti counterfeiting function is an important performance of special printing

with the continuous development of science and technology, a variety of anti-counterfeiting technologies have been produced, developed and gradually matured in various disciplines, and the scope of application is becoming more and more extensive. At present, the domestic anti-counterfeiting printing materials mainly include watermark banknote paper, safety paper and fluorescent paper, which are suitable for the anti-counterfeiting printing of banknotes, certificates and bills. The widely used anti-counterfeiting printing technologies mainly include: laser holographic anti-counterfeiting technology, special ink anti-counterfeiting technology. Anti counterfeiting inks include: UV excited fluorescent ink, sunlight excited discoloration ink, thermal anti-counterfeiting ink (thermochromic ink), chemical reaction discoloration ink, intelligent machine reading (machine expert identification) anti-counterfeiting ink, multi-functional or comprehensive anti-counterfeiting ink (laser holography plus fluorescent anti-counterfeiting ink), which reduces the shortcomings of horizontal bright spots caused by uneven heat dissipation and non-1 crystallinity. It is a special ink, such as light variable anti-counterfeiting ink, etc. The plate making and printing anti-counterfeiting technology of special printing is mainly used for the printing of banknotes and securities, and now it is also used in general businesses

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