Finishing new technology is the main topic of post-press development
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The packaging of the product uses a variety of processes to create new decorative solutions. The good solution is to apply a variety of varnishing systems with variable surface-specific plastics and films, new effect colors and finishing. However, it is not all that can be processed as designed by the designer, and can be printed, finished and processed into a perceptively attractive print without problems. The more finishing methods used, the more specialized the entire process. Before making a decision to invest in equipment, it is important to consider very carefully which process is best for which product and which new business area can be used to produce what.
Flexo unit and sheetfed offset for inline finishing
In the packaging and printing industry, most sheetfed offset presses are equipped with flexographic glazing units, which is also increasing in the field of part printing. Offset printing began to use flexographic printing technology in this way. It can be glazed with a cavity scraper and an anilox roller, and it can also perform accurate partial glazing. The flexo unit is located behind the offset printing unit and is typically used for on-line glazing of printed products or partial glazing. When the flexographic unit is located in front of the offset printing unit, the surface of the substrate can be pretreated, for example, by applying white varnish on metal paper or transparent plastic, and by flash printing in the subsequent process.
The advantages of offset printing are high print quality and low cost of prepress and printing. The feature of flexographic printing is the ability to form thicker coatings in a simpler process that can accommodate the printing of larger pigment particles. The flexographic printing ink is similar in viscosity to a thin gravure ink, and can form a thicker and uniform ink layer than offset printing, using different anilox rolls to change the thickness of the ink film. The particle size of the metallic pigment for offset printing was 3.5 μm, and the size of the metallic pigment particles of gravure and flexographic printing was 8 to 9 μm. These flexographic printing units are commonly used for coating opaque white coatings, milky white coatings, metal coatings, foam printing and scattering applications, and UV glazing coatings.
Sheetfed flexo press for off-line finishing
Sheetfed flexographic printing presses are often used as coaters in corrugated board printing. The new sheet-fed flexo press for packaging printing and finishing is equipped with a caries transfer system to ensure accurate transfer between the printing unit and the printing unit. Printed materials range from thin paper to cardboard with a thickness of 1.25 mm.
The sheetfed flexographic printing press is designed in the same way as a sheetfed offset press. There are two flexographic printing units in the offset printing unit that can be used as a coating machine for coating UV coatings or effect coatings. Some special coating methods require thick coatings such as foam printing, scent printing, barrier coatings, gum coatings, iridescent printing, and thick pigment coatings for metallic effects. This model precisely controls the amount of coating.
High quality packaging requires advanced finishing and requires multiple coater/flexographic printing units. If the five or six printing presses with the connected glazing unit are used for glazing or multiple coatings, they will soon become a "bottleneck" in production. Sheetfed flexographic presses used offline can also enter the field of high quality packaging and finishing.
Sheetfed offset press and UV technology for multi-finishing effects
The printing business using UV technology has increased nearly three times, and UV technology represents the highest level of quality, with high efficiency and good consistency when glazing. Of particular interest is the high gloss value of the UV coating and excellent scratch resistance. Under the irradiation of the UV lamp of the printing press, the UV ink and the glazing film are solidified in a fraction of a second, and the printed sheet can be directly processed. The problem of printing dust and solvent evaporation is gone forever.
However, it is not simply to buy equipment to master the UV printing and finishing process. Printers using UV technology need to accumulate experience to digest increased investment costs, materials and energy costs. In factories where traditional printing and UV technology are mixed, it is also necessary to plan the conversion time and adjust the printing parameters. UV prints also have odors, which are subject to further improvement. However, the advantages of UV far outweigh the disadvantages. A wide variety of non-absorbent printed materials are a real challenge for part printing, packaging and label printing.
Introducing a hybrid operation
UV presses need to be adapted to the specific requirements of the printing house and its products. Even for small-format offset printing, the powerful UV technology is equivalent to the UV technology used in medium and large format offset printing in all aspects. Those who are new to UV, it is best to start with UV and traditional printing mixing operations, the original finishing glazing is used as a UV printing machine. In the future, the waterless UV sheetfed offset press will also reveal the finishing benefits of non-absorbent printing materials that can image CTP waterless offset plates and CTP conventional offset plates on the same direct platesetter. , no chemicals to develop.
There is also a growing demand for plastic films. In the past, screen printing dominated this market share, and today's offset printing factory has entered this high-sales market because of its UV technology. However, screen printing now also uses UV technology to compete fiercely with its strong competitors. Since the high temperature-affected dimensional stability of the UV beam generator jeopardizes the printing and finishing processes that require precise overprinting, the UV system requires a significant reduction in the amount of radiation that is solidified in a nitrogen-filled inert gas chamber.
Online double coating
The double coater is a model that replaces the pure UV machine. The double coater can apply a much cheaper conventional ink on the machine with a UV coating device, and can also use some tested special color inks. However, the prerequisite is that there are two coaters on the press and the dryer section is located between the two coaters.
Hybrid technology, a finishing process that deserves careful consideration
The sheetfed offset press can be used with either traditional mineral oil based inks or mixed inks, but with corresponding changes to the press. Since the surface chemistry of the mixed ink is ultimately the same as that of the UV ink, it is necessary to avoid the disadvantages of poor adhesion of the coating and impurities in the bright layer.
High gloss and matt effects can be achieved in one press. The first printing unit is printed with a mixed color and the ink is then dried on a UV intermediate drying unit. Individual elements are then coated with conventional inks and conventional varnishes, followed by final UV coating and hardening, and the interaction of normal inks with UV varnishes in all of the graphic elements printed with the mixed ink/glazing oil. A matt, shiny, structured surface is formed that, similar to a plastic coating, is both visible and touchable, exhibiting an interesting design feature. From this point of view, the options for different combinations of effects are still many and varied.
It can be said that hybrid technology is a way of UV technology, and it is a system. Manufacturers who do not fully use UV machines in part printing will use hybrid technology.