For the current state of the art of flexo printing, the following five aspects are introduced from the printing plate, the ink, the anilox roller, the flexo press, and the flexographic process control represented by the label flexo. 2. Flexo ink technology 3. New anilox roller technology We are specialized Plastic Lid For Wet Wipe Bag manufacturers & suppliers/factory from China. Wholesale Plastic Lid For Wet Wipe Bag with high quality as low price/cheap.Each category represent their own group of specific products geared towards specific needs and results.All private label products are [made-to -order"according to customers requirements and market needs. Look forward to your cooperation! Baby Cleaning Wet Wipe,Plastic Box Wet Wipes,Plastic Lid For Wet Wipe Bag,Personal Care Make Up Wipes,Wet Wipes Packaging Lid,Plastic Wipes Lid Shaoxing Extra Beauty Hygienics Co.,Ltd , https://www.cnextrabeauty.com
1. The latest technology of the flexo that has been published
First, the laser-flexible flat top dot technology, which is a very hot technology in recent years, is based on the direct plate-making technology to further improve the wear resistance of high-gloss small dots, thereby improving the printing durability of the printing plate. Second, Kodak FlexcelNX flexographic dot technology, which uses square laser technology, randomly generates polygonal rectangles with a minimum dot diameter of 10 μm. Third, Esko HD dot technology uses a circular laser. Due to the participation of oxygen during the main exposure process, the photosensitive resin is not completely reacted, and the dot is sharpened by the washing, and the diameter becomes small. Fourth, Asahi Kasei (by Asahi) version washing techniques, which is characterized by having a surface tension of the UV ink to match the surface tension of the printing plate, the printing plate is not prone to plugging. I have followed this type of plate and found that the surface tension is 1~2mN/m lower than the surface tension of the laser plate we usually use. Fifth, DuPont's thermal plate technology, this is an environmentally friendly technology that deserves our attention. It warms the uncured photosensitive resin from solid to liquid and then liquefies it from a non-woven fabric under a certain pressure. The resin is sucked out to get rid of the interference with the surface tension of the printing plate when washing with the washing solution (including the organic solvent and the aqueous solvent), and the surface tension of the inking area and the depressed area of ​​the printing plate can be controlled to not fluctuate. Sixth, ContiTech's rubber plate technology, which is based on the offset horse brand blanket, the offset printing blanket has a very high printing durability, which can reach 5 million to 6 million impressions, so to reduce the cost of flexo printing, This is a way to consider. Seventh, other prepress technologies of flexo, such as square round web technology, hybrid mesh technology in special areas, and micro-hole technology on the surface of printing plates (in-situ screening technology). Why should we emphasize prepress technology here? As the saying goes, "seven-point version, three-point printing" is about the importance of plate making, and the importance of plate making is mainly reflected in prepress technology. Therefore, we must understand and master prepress technology when we engage in printing.
What are the characteristics of the new flexo technology? First, the flat top dot is a major correction to the laser flexo, which restores and improves the UV curing strength of the printing plate and improves the printing durability of the printing plate. Second, the most basic principle of flexo determines the characteristics of the printing plate. The printing durability of the printing plate of the flexographic ink printing process is the highest, which can exceed the printing durability of the gravure of 600,000 to 700,000 printing (no plating, one time) The printing durability after engraving), but the printing durability of the flexographic UV ink and solvent ink printing process is much worse, and the printing plate often has a lot of problems in the second printing, such as the break point of the independent point. , plate cracking, wear, insufficient printing resistance, lack of nets, etc. Third, there is a deficiency in the conventional washing method, that is, the solubility of the washing solvent fluctuates. In fact, flexographic suppliers have fixed testing methods for washing solvents, such as periodically testing several data, and then adding certain solvents according to the test values. But how many companies in the industry insist on doing this? As far as I know, everyone is running out of old solvents and then changing a new bucket of solvent. As for what is missing, only some companies are doing this. Because of this, the surface tension of the printing plate is fluctuated. Fourth, research on the surface tension of printing plates that matches the surface tension of inks is worthy of attention. In recent years, many companies in China have been working on this. As far as I know, a company that does KFC product packaging found in production that after a certain type of printing plate is determined, if the ink with different surface tensions is used, the probability that the printing plate will not block the plate is greatly increased. Therefore, the new technology based on the basic principles of flexo is worthy of our attention. The first-line flexographic technicians in China have been keenly aware of this.
In short, quality and cost are the internal driving force of flexo innovation, flat-top outlets, fine small outlets, all to improve the quality of flexo printing and reduce its cost. It is not a purely theoretical issue, but a real one. Cost issues, practical issues.
In recent years, flexo ink technology has made great progress. It is no problem to use solvent-based inks for film printing to achieve a drying speed of 600m/min. Paper printing is represented by Tetra Pak, which is 600m/min dry. Speed ​​water-based inks are no longer a problem, and UV inks printed on non-absorbent materials such as films and aluminum foils are commonly used on labels and are not a problem. It is worth noting that the adhesion of the flexo ink to the non-absorbent material, the drying speed, and the characteristics of non-adhesion and retention on the printing plate make the flexo ink quality system more complete.
When we talked about the anilox roller technology, we paid more attention to the matching of the number of screens and the number of screen rollers. The earliest was 1:4, and then it was increased to 1:5, 1:6, 1:7. A basic principle is that the minimum dot diameter of the printing plate must be greater than or equal to the opening diameter of the anilox roll cell to prevent the minimum dot of the printing plate from being inserted into the anilox roll cell. The improvement of the mesh shape of the laser ceramic anilox roller around the optimum ratio of the depth of the cell to the diameter of the opening is based on this basic theory. Generally, the depth of the cell is 23% to 33% of the diameter of the opening, and the optimum ratio is 28 %.
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August 07, 2021