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What is the relationship between the knife and gravure printing ink
Source: Date:2016-8-24
On the gravure printing process, soluble ink first related to the formation of knife fault. Because of the short gravure printing ink, from the blade to imprint point distance is usually less than 1 / 4 version and perimeter, sometimes in order to avoid high light the small dot premature dry ink, but also a sense of the scraper to imprint point closer to further shorten the distance. If there is a problem with the solubility of ink, scraper is likely to embedded ink impurities and particles, and on the gravure pull stripe, transferred to the printing material formed on the wire cutter. Especially ink prepared in accordance with the provisions of the proportion of mixed solvent added, there will be a volatilization of solvent and balance, mixed solvent adding proportion and in the process of evaporation of the solvent volatilization rates of serious asymmetry, which will directly lead to mixed solvent of slow drying agent retention, drying agent to escape.
In gravure printing ink, if slow dry agent of solubility parameters close to the solubility parameters of the resins, the residence is really solvent, ink is unlikely to appear the problem of poor solubility. But if drying agent of solubility parameters close to the solubility parameter of resin, stranded will be false solvent, which will bring a series of ink dissolved. At this time, the originally scattered uniform ink in the printing process will be re agglomeration of particles, wire cutter is one of the typical problems in the gravure printing.
Gravure printing production line to solve the knife wire fault of the classical approach of is in ink disk back to the ink tube installation of metal mesh, or a lady with silk stockings (one or two layers), online on the ink filter. But due to the dissolution of the ink itself, and about 20% after the barrel is open, the ink added mixed solvents on resin solubility, gravure printing technology and can not effectively inhibit ink particles to re unite.
Moreover, due to the short ink characteristics of gravure printing, the knife failures are inevitable. Gravure printing ink is very short, from the blade the intaglio surface excess ink scrape, to ink in rubber embossing roll from the gravure network points transferred to the printing material, the ink the length does not exceed version and the perimeter of the 1 / 4.
This is because the gravure printing process using positive scraper, scraper under version and rotating tangent direction of the ink impact, gravure printing scraper must move left and right along the axial and to prevent particles embedded node. When printing high light the small dot, there needs to be a scraper seat upwards and inwards, regulation, cutter head to version roller center regulation, the scraper to imprint point closer, which further reduce the ink. The ink is shorter, the risk for particles embedded in the knife roller formed between the wire cutter is greater. Here it is necessary to explain incidentally that flexo why no wire cutter: flexo roller blade will also because ink dissolved problems generated particles embedded node and the pull-out wire, but due to the flexo printing ink is gravure printing is much longer, for 1 / 2 roller circumference and 1 / 2 version and perimeter, which makes roller pull thread before they were transferred to the substrate material, has been covered with the ink fast leveling.
Toluene ink in the solubility in the advantage due to toluene solvent impact, since toluene is a good miscibility of solvent with other solvent, as long as the matched with other solvents mixed solvent in line with the aforementioned three principles of solubility, gravure printing ink on the solubility can be guaranteed, the printing process appear wire cutter probability will be greatly reduced.
No benzene ketones without the ink in the printing process is easy to cause the failure of wire cutter. At the beginning of printing, the fault is not obvious, but after a period of time to find the increase in the number of knife wire, and this knife is often caused by the unknown particles embedded in the scraper. And this type of ink is easy to bond on the scraper, after cleaning up will be improved, but after a period of time will find the scraper on the ink, if not processed will soon form a knife.
Phase comparison of toluene ink, benzene free without the solubility of ketones ink can not fully meet the corresponding indexes for toluene ink, and stability problem has become the main dilemma, printing process resulting loss become its Achilles heel.
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