Transparent inks often have the problems of difficulty and low accuracy in tracking and overprinting, which is a headache. Let's see how people in the industry can avoid this problem!
There are more and more applications of transparent inks. However, when using transparent inks, there is a headache that has troubled people in the industry. That is, tracking and overprinting of transparent inks is difficult and low precision, especially when they are prone to stretch deformation. When printing on the printing materials (such as PE, PA and other substrates), the thinner the printing material, the more difficult it is to track overprinting, not to mention that the overprinting error is controlled to ± 0.3mm when printing with transparent ink. This is More difficult to achieve.
Causes of tracking overprint problems with transparent inks
Why does transparent ink have tracking overprint problem? As we all know, in the production of flexible packaging gravure printing, tracking overprinting is that the visible light emitted by the color ink is reflected by the mirror surface to the tracking eye, and the tracking eye receives the tracking signal to achieve effective tracking of the overprint. However, in order to ensure the transparency effect of the transparent ink, the tracking overprint signal is usually weakened, or even no signal.
Solution
1. Some packaging and printing companies adopt a method of adding a small amount of white ink to the transparent ink to enhance the tracking signal. But practice has proved that this method will make the transparent ink appear weak white, which will affect the visual effect of the final print.
2. Some people in the industry have figured out a clever solution in tracking overprinting of transparent ink. The specific method is to add an appropriate amount of colorless fluorescent ink to the transparent ink, which can emit a wavelength signal that can be recognized by the tracking eye, thus Enhance the tracking signal to achieve the purpose of tracking overprinting. Practice has proved that after adding colorless fluorescent ink, the tracking signal intensity of transparent ink is obviously enhanced. More importantly, after adding colorless fluorescent ink, under the irradiation of long-wave ultraviolet light, the transparent ink can emit invisible light with a wavelength of 365nm, which not only maintains the transparent effect of the transparent ink, but also improves the anti-counterfeiting of printed products to a certain extent. The effect is really multi-purpose. At present, this measure has been successfully applied in actual production.
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