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Exclusive use of flexo ink is water-based ink, which has the advantage of environmental pollution, has no effect on human health, non-flammable, safety, ink, stable performance, colorful, non-corrosive materials, simple operation, cheap, printed, good adhesion, water resistance, fast drying per minute printing speed of up to 150 ~ 200m. It is because of these characteristics, flexo water-based ink is particularly suitable for demanding sanitary conditions of food, pharmaceutical, cosmetics and other packaging and decoration printing products in the printing and use. Then it is in use should pay attention to what issues? Water-based flexo ink key indicators 1, fineness Is a measure of the fineness of the ink pigments, fillers and other physical indicators of particle size, directly controlled by the ink manufacturers. Users generally understand can, in use can not change its size. Fineness aqueous flexo ink is generally 20μm or less, the fineness measurement instrument is the fineness of the scraper device. 2, the viscosity Viscosity is one of the main indicators of water-based ink, viscosity values will directly affect the quality of print, so flexographic printing to strictly control the water-based ink viscosity. The viscosity of the aqueous ink is generally controlled within 30 to 60 seconds / 25 ℃ range (paint 4 cup), viscosity control in general preferably 40 to 50 seconds. If the viscosity is too high, poor leveling, will affect the printability of water-based ink, easily lead to dirty version, paste version of such phenomena; if the viscosity is too low, it can affect the ability of the toner carrier drive. If water-based ink placed a long time, some poor stability of the ink easy to precipitate, layered, and some will be false thickening phenomenon. At this time, stirring sufficiently, the above problem can disappear. In the use of fresh water-based ink, be sure to stir in advance, and then make a dilution adjustment. In normal printing, but also regular mixing fountain. Water-based ink easy to freeze below 0 ℃. If water-based ink freezes, can be placed into the high temperature of the room, let the natural dissolved, stir, you can continue to use. In the large temperature difference between winter and summer, the viscosity of the performance of the most sensitive. Temperature is high, fast evaporation, drying also fast in the operation should focus on reducing the drying time or increase the speed of the machine; temperature is low, slow evaporation of water, water-based ink drying is slow, when the operation faster drying of water-based ink speed or additional drying device. Winter, in advance of the aqueous ink stored in warehouse placed inside the workshop, to balance the viscosity. 3, dried Aqueous ink drying is the most important indicator, because of the speed and viscosity as drying, can be directly reflected in the quality of printed matter. The operator must learn more about the drying principle, in order according to the product or the different substrates, a reasonable allocation of water-based ink drying time. Guarantee a good water-based ink drying must also take into account the moderate viscosity or pH stability. Drying of water-based ink include evaporation, absorption and reactivity coagulation three ways. Water-based ink printed completely dry, with strong water resistance and abrasion resistance. Drying too fast, easy ink surface crust, easy to dry water-based ink to the printing plate, resulting in dirty version, pattern around is not clear, and so can not rule out internal moisture, causing misregistration, the available blockers adjusted, but also Printing speed can be increased or closed drying system to solve. In shutdown, the best cleaning anilox roller or fountain, a short shutdown, but also stirring frequently fountain, to prevent surface crust; drying too slow, paper stretching, reduce gloss, will affect the overlapping color printing and adhesion may occur , give the machine operator a lot of trouble. At this time, you should first check the pH value is correct, according to the pH level, the amount of ethanol added stabilizer or put adjusted so that water-based ink drying faster. 4, pH value Aqueous ink contains a certain amount of ammonium, for improving its stability or enhanced water resistance after printing, therefore, pH values are important indicators. Water-based ink the pH of the factory, the general control of about 9. Machine using pH, adjust or control in between 7.8 to 9.3 And the temperature should be based on different substrates and flexible master . At the same time, taking into account the relationship between drying and viscosity, moderate plus adjustments for all kinds of additives. Gold ink should not be too high pH value can be controlled between 8 and 8.5, it contains slightly alkaline. Usually 2 to 3 hours tested once, with the prosecution with the tune, try to control pH optimum printability range. The main additive aqueous ink types, uses, dosage The main water-based ink additives are dilute, stabilizers, retarders, cleaning agents, antifoaming agents, diluents gold ink, UV curing promoting agent gold ink. 1 diluent Diluent is a milky slurry liquid with a certain viscosity, pH value is higher, you can deploy a variety of colors and dilute the four-color ink without reducing viscosity and pH, can be printed directly on the machine using the enhanced product brightness. Dosage according to the user's color artwork and depth of color may be. 2, stabilizers Stabilizer is a colorless transparent liquid, pH value up to 11, it can improve the pH of water-based ink, water-based ink curing enhanced drying time. If the normal printing, pH value was stable viscosity can be too large 1  1 diluted with water to adjust the viscosity of the aqueous ink, the general control of use of 4% to 6%. 3, blockers Blockers (slow drying agent) is a slightly pale yellow liquid, pH value around 5.5, it can inhibit and reduce waterborne curing ink drying time, prevent the surface crust, the speed is too slow and dependent on the water-based ink drying too quickly and causing the dirty version, paste version phenomenon to some extent. When the water-based ink viscosity is too large, but does not require excessive use of blockers, it can be diluted with water before use, the general amount at 3% to 5%. 4, defoamer Defoamer main performance is to eliminate air bubbles in the water-based ink, to prevent the printing of bubbles generated because of the white point, blisters, etc. from the waterlines. Usually in the amount of 0.5% to 1%, the amount of excess, but affect the product quality, the best use is ejected from the spray 5, gold and silver ink thinner Gold and silver ink diluent is a milky turbid liquid, which itself has a certain viscosity, pH, containing slightly alkaline, the main performance is to regulate the gold ink viscosity, improve printability, without the gold and silver ink oxidation, darken to maintain the original luster of gold and silver ink. Dosage is generally controlled within 2% to 8%, and should be based on temperature, substrates, speed and flexibility to use different. 6, UV curing accelerator gold ink Field deployment UV gold ink, the main use of UV curing accelerator gold ink, helping to improve the speed of light curing, improve the speed and increase production. General dosage controlled at 5% to 10% can be. 7, cleaning agents Cleaning agent washing machine is mainly used for printing plate and anilox and handling dry, water-based ink crusts. Leftover ink recovery and utilization Because the fountain must maintain a certain amount of ink in order to ensure the normal printing presses Taiwan, each machine can not run out of ink every time. The end of each batch printing products, generally have a certain amount of remaining ink. Multi-species, multi-color printing units, each product will be a certain amount of ink remaining holding such treatment. If you do not timely adjustment, continue to use it wasteful, increased costs. This requires the deployment of ink when I try to grasp at the lowest point. Leftover ink must be individually bloom, sealed, not to skin or debris mixed with ink. If you do not clean, use mesh filter is good, the next time you use when you first use leftover ink, light colors to dark colors may be transferred to, or printed on rough paper priority to use low-grade products. Preservation of water-based ink Water-based flexo ink retention period is normally one year, more than shelf-life or longer, as long as there are no coagulation of colloidal, only the surface layering or precipitation, just stir, you can continue to use. Storage temperature should be in the range of 5 ℃ -30 ℃. Best kept in the warehouse, can not open saved, not exposure, and do not store below 0 ℃ warehouse. Gold ink shelf life of six months or less than six months.