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In 1995, the flexographic direct plate-making technology was introduced into the market, which greatly improved the accuracy and quality of plate making, and avoided some defects of the traditional plate-making technology, which made the flexographic plate-making technology achieve a qualitative leap. However, since the advent of direct plate-making technology, some of the inherent defects of flexo have not been well solved. To this end, high-definition flexo printing technology came into being, and has become the promoter of the development of flexo printing. This article will focus on high-definition flexo printing technology and its impact on the future development of the packaging printing market.
HD flexo technology consists of high-resolution laser imaging technology and high-definition dot technology.
1. High resolution laser imaging technology
Flexographic plate-making technology typically has an imaging resolution of 2100 ppi and a laser spot size of 18 μm, while HD flexo technology has an imaging resolution of up to 4000 ppi and laser spot size down to 6 μm, which not only better reproduces image detail, but also It can avoid the generation of moiré. More importantly, the 4000ppi imaging resolution has more available grayscales. In addition to meeting the 256-level gray step usually required in the design phase, it can still be retained after the tone compensation. Sufficient gray steps give the prints excellent visuals while providing high definition and high contrast.
2. HD network technology
The high-definition dot technology adopts a brand-new screening technology in the high-light area, which is different from the “hybrid†screening in the usual sense, but the “differential modulation†screening. That is to say, the dots maintain the regular grid arrangement, just like the standard AM circular dots, but in the highlight region, there are no independent dots or irregularly spaced dots (see Figure 1) by changing the dot size. In the end, these differentiated dots will also participate in the printing, so that the highlights can be faded to zero printing, while ensuring the printing durability of the plates.
At the same time, high-definition dot technology selectively uses special screening techniques for the field and shadow areas, namely microcell technology. In general, the application of the microcell structure to the entire printing plate affects the overall quality of the printed image, while the high-definition dot technology enables the in-situ and dark-adjusted areas to achieve gravure printing through controlled micro-cells. Among them, controllable means that the micro-grid does not appear on the edge of the pixel, so that the edge of the printed graphic or dot can be kept intact and sharp. In addition, with the same amount of ink printing conditions, the use of micro-cell technology can result in a smoother, higher density field, and a higher contrast dark tone.
The above content is selected from the 9th issue of “ Printing Technology·Digital Printing Arts †of Science and Technology Media in 2013. For more journal content, please pay attention to the journal channel, and click on the latest journal content to enter the electronic journal channel of Keyin.com.
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