In the past few years, the online surface finishing of single-sheet digital prints has not only been increasing in number, but also getting better and better. Only additional printing units can achieve higher efficiency. For end customers, post-press processing of printed matter is the most important part. A variety of glazing and laminating, as well as embossing and die cutting not only give the printed product a gorgeous appearance, but also have the functionality of being waterproof, resistant to light or wear. In this regard, offset printing can be achieved with a variety of machines, using connection, near-line or offline to "finish" the print.
Compared with offset printing, digital printing is subject to certain restrictions in terms of diversification of surface finishing. But digital printing has a new way to obtain the same effect as offset printing. These effects can be achieved online, without having to move the printed pages from one workstation to the next. To this end, suppliers have provided a variety of solutions.
The overall solution is the most popular, which requires the use of one or more units of digital printing presses. In addition, external devices integrated in the online workflow can also be provided.
Kodak NexPress
Kodak's NexPress SX series is a good example of integrated solutions. At present, special dry toners are provided to the five printing units, which can achieve impressive results. For example, Gold Dry Ink (golden dry toner) not only produces a metallic gold color, but also replicates other metallic colors like copper. To this end, Gold Dry Ink is overprinted on other toners in order to achieve the appropriate color tone. Dry toners have similar functions for pearlescent and glow effects.
Three-dimensional transparent dry toner can print out tactile effects. This toner absorbs charge through the fifth printing unit, and produces a raised ink layer after fixing, the height of which can be set accurately. The transparent toner can not only be overprinted on the toner, but also directly printed on the unprinted paper, producing a matte and high gloss gloss effect. The coating prevents wear and dirt on the entire printed page. In order to achieve a high-gloss effect with transparent dry toner, the standalone Kodak NexPress requires the use of high-gloss units near the line.
Especially for safety tasks, red fluorescent dry toner can only see a specific color when the corresponding incident light is on the paper. Therefore, it is impossible to copy the protective documents faithfully to the original. There are other special toners for photo printing and expanding the color gamut.
Trucoat online UV coating machine
Trucoat online UV coating machine can achieve other surface finishing effects. California ’s Tec Lighting machine manufacturer ’s equipment can be connected to each printing press through a sheet conveyor belt, and choose matt or high gloss UV varnish coating printing products.
HP Indigo
Hewlett-Packard's various digital presses use electronic inks developed by Benny Landa. This toner can overprint up to 50 layers. From the entry-level HP Indigo 3550 with 5 printing ink sets to the high-end HP 10000 with 7 printing ink sets, through the proficient use of standard colorants and special colorants, you can easily achieve a variety of surface finishes on the machine Decoration effect.
Electronic ink can be stirred outside the machine just like offset ink. Another feature of Indigo is that it can print a unique printing color-white, in order to print transparent substrates, or other colors on the metal substrate as the base color. HP Indigo electronic ink can produce a partial glazing effect similar to matt UV glazing.
The additional printing device can also be equipped with HP Indigo transparent electronic ink. Overprinting up to 50 layers can produce a very precise relief effect. In order to achieve the embossing effect, you can choose to overlay printing with electronic ink and the corresponding coating. There is also a special paper that can print up to 250 layers of yellow electronic ink.
HP Indigo provides a special "invisible red" electronic ink for security printing. This toner can only be seen when the corresponding incident light is irradiated, so it can be used for anti-counterfeiting. When printing photos, use different spot colors, such as light cyan and light magenta, and black, to ensure that almost the entire color spectrum is reproduced.
Fuji Xerox
From traditional photocopiers to iGen4 high-efficiency digital presses, Fuji Xerox provides a wide range of solutions. However, the surface finish of Fuji Xerox equipment may not be as diverse as other suppliers.
Fuji Xerox DocuColors 800 and 1000 series printers already provide a variety of options with the help of transparent dry toner. Transparent dry toner can provide partial glazing to the entire surface, and can produce different glazing effects on fine lines. The top iGen4 can also achieve online polishing effect. The "matte dry toner" equipped with it is especially suitable for photo printing and can realize page finishing.
In addition, there is EpicCTI-635 online high-efficiency coating system, which can coat UV or water-based varnish during high-speed operation of the equipment, including matte, mercerized, high-gloss, and metallic and pearlescent effects. Can also be partially coated with glazing and safety varnish, but only use the flexographic version.
Canon
Canon provides a variety of surface finishes with the imagePRESS C1 + small system. The machine uses 5-color printing, with the help of transparent toner to produce a matte and shiny full or partial glazing effect. Using transparent toner and some technologies can also produce a metallic color effect.
The online surface finishing of digital printing machines is diverse and very convenient, especially the printing device can be used to make the surface finishing more convenient. Not every surface finishing function can be connected with every device. On the other hand, changing the equipment from one surface finishing method to another will result in loss of efficiency, offsetting the increased efficiency of employees who no longer need to transport printed sheets from the machine to offline surface finishing. If each printing job is to be adjusted and operated on the equipment, the advantage of digital printing suitable for a small number of prints becomes an unfavorable factor.
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