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The demand for plastic film printing is on the rise. In the past, this was a monopoly market for screen printing. With UV technology, offset printing manufacturers can also be involved in this market. Because the high temperature of the UV lamp affects the stability and registration accuracy of the substrate, a new UV curing system is now available. The ink or varnish can be cured in an enclosed chamber filled with inert gas or nitrogen, reducing the UV lamp. Tube performance requirements.
In addition to a single UV-curing device on the market for double coating machines , dual-curing devices are now available. It is possible to perform on-line UV coating on ordinary offset printing inks, and the cost is significantly reduced. After testing, special colors of ink surface can also be UV glazing, provided that the printing machine must have 2 coating units with a drying zone in between.
Mixed Ink Another focus of interest in the on- line processing of processing technology is the hybrid ink technology, which allows the use of both traditional mineral inks and new hybrid inks on a sheet-fed offset press. The premise is that the printing press must be properly modified. Since the chemical properties of the mixed ink surface are virtually the same as those of the UV ink, the ink does not swell the rubber blanket or the rubber roller at the same time as overcoming problems such as weak bonding and poor print glossiness.
To achieve laminating effect Until now, missing printing technology, such as screen printing technology, is a commonly used technique that achieves similar plastic texture effects, but its production efficiency is lower than that of sheet-fed offset printing, and therefore it is not suitable for medium or large batch activities. The printing of the pieces. For this purpose, KBA experts will cooperate with printing ink manufacturers Sun Chemical and Epple to launch a solution suitable for large-volume sheet-fed offset printing: Printing inks, texts, or other images in the first color group of printing presses need to be emphasized. Highlighted parts; then dried and cured by a UV dryer; printed in a later color set with a conventional oil-based offset ink/varnish; and finally UV-cured and UV-cured. In the final print, the text part printed with the mixed ink can achieve high gloss, which can only be achieved through double-layer coating before, not only taking up more equipment resources, but also consuming more Power and energy. The graphic part after printing with oil offset ink will show a matte and matt effect under the interaction of conventional ink and UV varnish. If a special kind of varnish is used, even a film-like effect can be achieved even in visual and tactile sense.
The low-input localized coating can be locally applied using the hybrid ink system. Even if the coating is of a complex shape, it can be obtained by only one glazing unit. In the past, the need for a special printing plate for spot-off offset printing, such as a photosensitive resin plate made by a professional company, or a hand-sculpted glazing plate, was not only expensive to make, but also required an increase in the plate time. The new technology can use two different inks at the same time, using two ink printing graphics to form a sharp contrast on the gloss, to achieve the purpose of local glazing.
Offset manufacturers are always faced with some problems when providing services for printing customers. They need to provide value-added services, prices must be reasonable, and the printing effect must be different. As the printing machinery adopts a modular structure, this lowers the threshold for entry into the above UV technology. Therefore, the upcoming Drupa 2004 is an ideal place for you to weigh all processes and understand the overall overview of inks and offset presses. After all, UV technology will infiltrate commercial offset printing in the coming years.
New Technology of Packaging and Printing (2)
UV printing + conventional offset UV printing press needs some adjustments to meet the requirements of different printing manufacturers and prints, UV printing unit can be combined with small format, medium format, wide offset press. For beginners of UV technology, we recommend that UV printing and conventional offset printing be used at the beginning to ensure that the primer coating layer meets the requirements of the UV printer. In the future, the waterless UV sheet-fed offset press will also prove its advantages in packaging printing and processing, especially printing non-absorbent substrates. With the wide acceptance of UV technology, it will promote the application of waterless UV sheet-fed offset presses. UV technology also includes CTP waterless version and CTcP and other technologies.