The quality characteristics of the current flexo market are: large patterns, large color blocks, good at text and lines, medium and thick dots (the number of printing plates plus screen lines is less than 133 lines / inch), and the best color gamut is midtone (the dot area The hierarchical expressiveness of the round screen image in the area of ​​2% to 3% or more and 70% or less is the strongest).
The following are the latest technologies and their characteristics of flexo:
First, the flat-top dot technology of laser flexo. This is a hot technology in recent years, which further improves the wear resistance of high-gloss small dots on the basis of direct plate-making technology, thereby improving the printing plate's durability.
Second, Kodak FlexcelNX flexo dot technology. It uses square laser technology to randomly generate polygon rectangles, and the minimum dot diameter of the printing plate reaches 10μm.
Third, Esko HD network technology. With a circular laser, due to the oxygen participation in the main exposure process, the photosensitive resin does not react completely, and the dots become sharper and the diameter becomes smaller through plate washing.
Fourth, Japan's Asahi's water-washing technology. It is characterized by the surface tension of the printing plate that matches the surface tension of the UV ink, so it is not prone to blockage during printing. I have conducted a follow-up test on this printing plate and found that its surface tension is 1 to 2 mN / m lower than the surface tension of the laser printing plate we usually use.
Fifth, DuPont's thermal version technology. This is an environmentally friendly technology that is really worthy of our attention. It changes the uncured photosensitive resin from solid to liquid by heating, and then sucks the liquefied resin from the non-woven fabric under a certain pressure, eliminating the use of plate washing liquid ( (Including organic solvents and aqueous solvents) The interference on the surface tension of the printing plate during plate washing can control the surface tension of the inked area and the depressed area of ​​the printing plate without fluctuation.
Sixth, ContiTech's rubber plate technology. It is built on the basis of the offset printing rubber blanket. The offset resistance of the offset printing blanket is very high, which can reach 5 million to 6 million prints, so it is a way to consider to reduce the cost of flexo printing.
Seventh, other pre-press technologies for flexo, such as square-circle screen technology, hybrid screen technology for special areas, and micro-pore technology on the surface of the printing plate (field screening technology).
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