How to effectively improve the processing speed of

2022-09-22
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How to effectively improve the processing speed of carton flexo printing

when processing cartons by flexo printing, the general production speed is 300 per minute. Because the tensile testing machine can measure the performance of a variety of products - 1000 feet. Although the speed of many flexo printing machines can reach 2000 feet per minute, if you really produce at this speed, there will be many unexpected printing failures. The reason is not the printing press itself, but by the ink formula and substrate surface treatment and other factors

ink feeding: the closed ink scraping system can fully ensure that less ink surface area contacts the wrinkle roller. In order to maintain the effective ink supply of the ink system in a high-speed printing machine, a good ink supply device is needed. At the same time, the ink supply pump and the transverse feed position also need to be optimized

scraping and friction: the application of double-edged ink system increases the friction between the doctor blade and the stripper roll. With the acceleration of printing speed, the surface temperature of the stripper roll is as high as 1400 degrees Fahrenheit. This kind of PCL material also points out that with the proximity and continuous tightening of carbon emission regulations, it will promote another 3D bioprinting system being developed in South Korea. Under the action of high temperature, the ink in the hole of the wrinkle roll begins to dry. When its solvent decreases instantly, the surface tension of the ink will increase, and the surface wettability of the ink will decrease. If water-based ink is used, the hole shape and volume will also affect the ink outflow ratio. Diamond, hexagonal and other spherical holes with edge holes that rely on surface tension dynamics alone can provide better ink flow

printing substrate: another noticeable problem in high-speed printing is the surface tightness of the printing substrate used. Generally, the higher the tightness, the better the moisture absorption and flow performance of the ink, and the better the drying performance

ink moisture absorption: high speed printing reduces the residence time of the ink before reaching the drying device, so it is necessary to adjust the rheology of the ink to meet the conditions of high-speed printing

drying: Although many drying equipment have strong drying capacity, with the improvement of drying speed, we should consider whether the residual solvent is within the requirements. In actual production, the drying temperature may be appropriately increased when necessary to match the drying speed of some inks (such as water-based inks)

ink: the ink itself should be reprocessed to adapt to the printing speed of 1500 feet per minute. The reprocessing treatment includes: adding a solid mixed solvent; Or adjust the pH value; Or add a more suitable surface humidity medium. The color intensity of high-speed printing inks should be appropriately improved. Thinner inks can obtain better printing results, and the drying of prints will also be improved

foaming: foaming, another phenomenon that often occurs in high-speed printing of water-based inks. In high-speed printing, the residual air in the ink cannot be released quickly, resulting in microporosity on the printed matter. In order to effectively solve this problem, defoamers are usually added to the ink system

reprinted from: China Packaging News

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