Part D Glazing process and analysis of quality factors
The glazing process is a technique and method for applying a layer of uncoated transparent coating on the surface of the printed product, after leveling, drying, calendering, and forming a thin and uniform transparent bright layer on the surface of the printed matter.
UV glazing process knowledge and troubleshooting
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Third, double glazing system introduction
For those printers who wish to continue using standard inks and are unwilling to use UV gloss for certain print jobs, double glazing is definitely the right choice for them. The two coaters are usually located at the end of the press. In order to eliminate or reduce the possibility of loss of light (the glazing oil penetrates into the ink or substrate), a layer of water-based varnish must be applied between the wet offset ink and the final varnish to isolate the offset ink and use infrared light. Or when heat radiation drying, it can be used as the basis for UV varnish adhesion. At the same time, each glazing unit must have an integrated drying unit, which increases the size and equipment cost of the printing press. However, such equipment can achieve a greater range of gloss than a pure UV printer. In addition to the use of waterborne varnish plus UV varnish, these devices can also be used to apply the same aqueous varnish twice (eg to apply two coats of varnish on the substrate to increase the final gloss), Or apply two different varnishes (eg apply a standard varnish by the first glazing unit and a special effect pigment through the second glazing unit). A double glazing press also has a model in which a flexographic printing unit and drying unit are installed prior to the first offset printing unit to apply an opaque white or special effect primer.
Fourth, the introduction of pure UV glazing system
The use of UV inks and in the final printing line for UV glazing enables the prints to achieve extremely high gloss. However, once such a pure UV system is employed, it is almost impossible to convert to other types of glazing operations.
V. Introduction of composite glazing printing equipment
Unlike a pure UV printer, a composite press is generally a printer that can apply a composite ink and perform the final UV glazing, as well as a conventional offset ink and water glazing. This type of press is able to easily and flexibly switch between these two modes of operation without the need to replace rubber rollers, blankets and dryers. In order to adapt to different modes of operation, the composite press is equipped with IR (infrared), hot air and UV curing devices.
Composite presses are more versatile than pure UV presses and do not require operator experience in UV printing production. The gloss obtained by UV glazing on composite inks is much higher than that obtained by applying two coats of varnish on standard inks, which is close to the level of pure UV systems. Moreover, the composite printing press is particularly excellent in the combination of no light and gloss effects, and the gloss contrast effect obtained is much higher than that of applying a layer of water-based varnish before UV glazing. And composite glazing offers additional options such as a blend of grain and gloss effects. In addition, if a suitable configuration is used, the composite press can print with a small amount of alcohol or even without using alcohol, and environmental protection is guaranteed.
The composite press is the largest combination of UV printing and double glazing, so the composite press is another ideal tool for the UV printing and glazing market. However, the composite printing press can be used with a small amount of printing without even using alcohol, and thus the environmental certificate obtained is highly commended.