The bottleneck of the development of thermal flexo

2022-08-05
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Direct plate making: the bottleneck of the development of thermal flexo technology

as a relatively new printing industry in China, flexo printing has made great progress in recent years. Flexographic printing using water-based ink is an environmentally friendly printing method, unlike gravure printing, which will cause great pollution. Moreover, the cost of flexo printing is very low, and the printing volume is amazing. It can be applied to a variety of special materials, such as single sheet paper and web material. It is most suitable for packaging printing and printing of various labels

compared with European and American flexographic printing products, the quality of domestic flexographic printing is much inferior. Why can't domestic printing products comparable to offset printing quality like foreign ones? It is not that the quality of flexo printing machine is not good. The main problem lies in the production of flexo printing plate

the biggest problem with flexographic printing is that the dot enlargement is too serious, so it is completely unable to show dots below 5%, and the middle and dark levels are also seriously lost. At the same time, due to the ductility of flexible plates, overprint is also difficult

in view of the above problems, the thermal direct flexo technology makes the quality of flexo printing close to offset printing through various technical means. The most important change is the plate itself

the laser is directly exposed on the carbon mask layer for imaging, so there is no need for film, and there is no need to vacuum when printing. If the most advanced liquid photosensitive resin digital flexographic plate is used, it can also achieve:

1) it can reproduce the point from 2%-98% during printing

because the pressure bearing area of large points is large, the point expansion is much less than that of small points. In digital liquid flexo, because the height of small points is lower than that of large points, it can be effective. Asahi Kasei also recently pointed out that the European companies' strong acquisition of American manufacturers can control the point expansion of small points

2) reproducing the middle level points stably

3) lower plate cost

4) the details at the highlight and dark tone are retained, and the flat and gradient are very soft

5) UV printer and printer are also required, and the customer's existing equipment investment will not be wasted

in digital flexo printing, the center point always contacts the substrate first, while in traditional flexo printing, the edge of the point contacts the substrate first, so it is easy to cause hollow points. Digital flexo printing does not have this problem

another effective method to improve flexo printing quality 2 Hybrid flexo technology is used when using electric conduit. To put it simply, hybrid additive technology is to use FM additive technology in the highlight part of the image (points below 10% ~ 15%), while the traditional am additive technology is used in the middle tone and dark tone part (points above 15%). The size of frequency modulation points is adjusted from 50 μ m to about 50 μ m in the cluster. After using hybrid technology, because each solution is coated with fine microbial ceramic particles made of hydroxyapatite (calcium phosphate mineral found in teeth and bones), only 50 μ m points will have relatively large wear at the tip during plate washing, so they will also be lower than the average height of large points, thus effectively reducing the expansion of points

before the merger, Creo Canada and saiangel Israel had their own thermal flexo plate making equipment. After the merger, the two companies can provide a full range of thermosensitive flexo direct plate making equipment from octavo format to ultra large format (double full open) and seamless sleeve flexo

we are looking forward to the vigorous development of flexo direct plate making and printing technology in China, and to providing the final packaging printing customers with lower prices and better quality prints

reprinted from: digital printing

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