Digital printing and finishing technology
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I also remember that at Drupa 2016, the Scodix company in Israel was very lively and the products were eye-catching. The company's finished samples and various fine prints made on the spot surprised almost every visitor. Scodix's "hot" is based on its innovative Scodix sense high-gloss partial finish, Scodix foil analog aluminum finish, Scodix glitter partial flash finishing technology, based on which local glazing, bronzing and partial gold deposits can be achieved. Effect.
Digital printing has become one of the mainstream printing methods in the printing industry. It perfectly explains the most active side of printing with short-term, personalized and on-demand advantages. However, the market is increasingly demanding the quality and characteristics of printed materials. It is not only expected that the quality of digital printing products is comparable to the quality of traditional printing, but also that digital printing products have rich performance effects, such as bronzing, bump, rainbow effect, etc. How to use digital technology to achieve these effects is the direction that the industry has been studying.
Scodix is the first to use digital technology to achieve printing efficiency and match digital printing speed. In addition, there are Ricoh production digital printing machines on the market, as well as DS series digital hot stamping systems introduced by China Institute of Printing Science and Technology, etc. Etc., they use different technical routes to achieve post-press finishing effects such as bronzing, glazing, and gold-plating. This article will introduce these technologies in detail.
Scodix UV inkjet technology
Scodix uses 100% solids UV ink, solvent-free volatilization, high printing efficiency, ink is diluted with reactive monomer to ensure the system is at a lower viscosity (about 10mpas), so that the ink can pass through the nozzle and spray in the form of ink droplets. The surface of the substrate. The curing of the ink is a crosslinking reaction initiated by the activation of the initiator by ultraviolet rays. If the curing is incomplete, the heating of the resin component in the ink can produce a strong viscosity and then transfer.
Key technology. Scodix RSP technology is a scanning and positioning technology. Based on the dual CCD acquisition system and compensation software, the original can be rotated, scaled and moved to adapt to the substrate, thus achieving precise positioning and strict registration.
Process. Scodix Sense achieves a change in the effect of the matte to bright light on the ink layer by changing the parameters of the system transparency; Scodix Crystals achieves a 3D glazing effect through the accumulation of ink layers; Scodix Foil achieves a bronzing effect by heat-activated transfer after curing the ink layer; Scodix Glitter A layer of bright powder is applied before the ink layer is cured and post-cure to achieve a gold-splitting effect.
Ricoh toner printing technology
The most representative model of this technology is the Ricoh Pro C7100SX single-page color production digital printing machine, which can print colors other than CMYK four colors, and can also realize white, metallic and local UV expressions, especially suitable for high-end. Proofing and small prints in carton and plastic boxes.
Key technology. (1) The fifth color: white or transparent color can be used as the fifth color, the white toner expands on the colored paper, and can also be used on transparent media, such as light box, window sticker, transparent toner It can achieve partial glazing, watermarking, and a metal-like effect that provides a high-grade special feeling. (2) VCSEL: VCSEL is a vertical cavity surface emitting laser technology that can simultaneously emit 40 laser beams to achieve high resolution (1200 × 4800dpi), enabling small text and thin lines to be vividly reproduced. (3) AC transfer technology: AC transfer technology improves the transfer effect of textured paper, so that thick elasticity and large fixing belt can apply enough pressure and heat to fully melt the carbon powder, thus achieving fine print of textured paper.
Process. The toner is composed of resin, carbon black, magnetic iron oxide, charge control particles, lubricant, and hot melt plastic. The resin and carbon black are the main image forming materials. If the carbon black is removed from the carbon powder, it becomes a transparent toner. . Increasing the transparency of the resin in the toner can increase the gloss of the transparent toner. After printing four colors and then printing a transparent color toner, the partial gloss of the graphic can be increased, thereby achieving a prominent glazing effect. Printing a golden yellow and then overprinting the transparent toner will give a metallic effect (fake gold).
Sino-Indian Institute of Waterborne UV Inkjet Technology
China Printing and Technology Research Institute DS series digital hot stamping system is a new digital post-printing finishing technology based on water-based UV nano-ink research and development. The principle is to print the water-based UV ink on the surface of the substrate through a high-precision printing nozzle, directly curing, transfer curing or gold-slurry curing, thereby completing the requirements of different finishing.
Key technology. (1) Resin nano-scale dispersion: Resin dispersed in water in the form of nanoparticles is the key to ensure that the ink is not blocked. At the same time, water is used as a solvent to ensure that the glue does not have any corrosive effect on the nozzle, which greatly prolongs the life of the print head; Resin nano-dispersion can be used to prepare a more stable nano-suspension system by physical dispersion and chemical vapor blending.
(2) Viscosity and wetting of UV glue: Viscosity is an important guarantee for the smooth progress of UV inkjet, and the viscosity and resin solid content are mutually restrictive. The higher the solid content, the subsequent drying process can be greatly simplified. Therefore, high solid content and low viscosity are a key factor; for different materials, wettability and wetting speed have important and strict requirements. Therefore, hot stamping for different material surfaces is also very important.
(3) Independent module technology: The digital hot stamping process includes four steps of printing, drying, stamping and curing. The fineness of printing is the premise, drying is to better imprint, the first three steps jointly determine the quality of hot stamping, and the final step of curing, to ensure the durability of the hot stamping effect. To achieve four modules to be relatively independent, in order to transport, maintenance, replacement, but also to ensure the continuity of the four modules, in order to facilitate the automated production of the line.
(4) Software automation technology: the four steps of printing, drying, embossing and curing are automated, thus achieving one-button operation, keeping the quality of hot stamping stable and convenient and quick.
Process. (1) glazing: the surface of the substrate is kept at a constant temperature of 30 to 50 ° C. The water-based UV ink is sprayed on the surface of the substrate to form a transparent viscoelastic state. After printing, the ink is leveled and enters the UV unit. Crosslinking occurs to form a dry, smooth surface.
(2) Hot stamping: The hot stamping unit uses the adhesiveness of the ink to peel off the aluminized layer on the hot foil to remain on the surface of the substrate, and enter the UV unit. The ink resin crosslinks to form a flat, high-adhesive hot stamping image. Hot stamping process.
(3) Sagin: After printing, sprinkle a layer of gold powder or metal sheet, enter the rolling unit to press the gold powder or metal sheet into the glue, enter the UV unit to solidify the glue layer, and finally recover the excess powder to complete the gold casting process.
Summary
From the perspective of price, efficiency, quality, environmental protection, etc., all of the above three products have their own advantages. Scodix products are suitable for high-volume high-end markets, such as post-printing finishing of the printing. Ricoh toner printing machine is only the glazing The product is added to the product, the customer will not buy this equipment because of the glazing business. After all, the equipment price is more than 2 million, but the toner gilding process is a very mature process, and once the toner is partially stamped in the future. And integrated into the printing machine, will greatly enhance the added value of the product; China Academy of Science and Technology DS series digital bronzing system for small-scale short-running market, such as proofing, personalized product customization, hot stamping high-definition, price Being close to the people is the biggest advantage of this product.