subject: Flexo water-based ink used in several considerations - water-based inks, flexo - Printing Industry [print this page] Flexo water-based ink used in several considerations - water-based inks, flexo - Printing Industry
Flexo printing machine using a special ink is water-based ink, it has the advantage of environmental pollution on human health have no impact, not easy to burn, good security, stability and ink performance, colorful, non-corrosive plates, operating Simple, cheap, printed, good adhesion, water resistance, dry fast, printing speed per minute 150-200m. It is because of these characteristics, flexo water-based ink suitable for demanding conditions on health food, pharmaceutical, cosmetic packaging and decoration printing products such as printing and use. Then it should be noted in the use of what problem?
Print Network HC Flexible Print Machine using a special ink is water-based ink, it has the advantage of environmental pollution on human health have no impact, not easy to burn, good security, stability and ink performance, colorful, non-corrosive Plate , Simple, cheap, printed, good adhesion, water resistance, dry fast, printing speed per minute 150-200m. It is because of these characteristics, flexo water-based ink suitable for demanding health conditions Food Class, Medicine Class, cosmetics etc Package And decoration printing products, printing and use. Then it should be noted in the use of what problem?
Flexo water-based ink key indicators 1, fineness Fineness is a measure of ink pigment, filler particle size and other physical indicators, direct control by the ink manufacturer. General understanding of the user can, in use can not change its size. Flexo water-based ink fineness generally 20 m below the instrument is measuring fineness fineness scraper instrument.
2, viscosity Viscosity is the main indicator of water-based ink, the viscosity value will directly affect the quality of print, so flexography to strictly control the viscosity of water-based ink. The viscosity of water-based ink generally controlled 30-60 seconds / 25 range (with Paint 4 cup), viscosity control in 40-50 seconds generally good. If the viscosity is too high, poor leveling, will affect the water-based ink printability, easily lead to dirty version, paste version of such phenomena; if the viscosity is too low, it will affect the carrier's ability to lead pigment. If water-based ink
place over time, some poor stability of the ink is easy precipitation, stratification, and others may be false thickening phenomenon. At this time, can be fully mixed, the above problems can disappear. Fresh water-based ink used, be sure to stir before, then adjusted for dilution. In normal printing, but also regularly mixing fountain.
Water-based ink easy to freeze below 0 . If water-based ink freezes, it can be placed into a high room temperature, let it dissolve, mix well, may continue to use. Large temperature difference in the winter and summer, the performance of the most sensitive to viscosity. High temperature, rapid evaporation, drying is also faster in operation should focus on reducing the drying time or improve the machine speed; temperature is low, slow evaporation, water-based ink drying too slowly, when in operation faster drying water-based ink speed or additional drying equipment. Winter use, better water storage in advance to the Treasury ink placed inside the shop to balance the viscosity.
3, drying Drying is a water-based ink in one of the most important indicators, as dry as the speed and viscosity, can be directly reflected in the quality of printed materials. Operators must learn more about the drying principle, can be the basis of different products or substrates, and reasonable allocation of water-based ink drying time. Ensure good water-based ink drying the same time, must take into account viscosity, pH, moderate or steady.
Water-based ink drying include evaporation, absorption and reaction of solidification in three ways. After thorough drying water-based ink printing, with strong water resistance and wear resistance. Drying too fast, easy ink surface crust, easy to dry water-based ink to the plate, causing the dirty version, no clear pattern around, and that internal moisture can not be excluded, which led to overprint allowed, adjustments can be blockers, but also can increase printer speed or close the drying system to solve. In shutdown, the best cleaning Anilox roller Or fountain, short stop, we should also always mixing ink fountain to prevent surface crust; drying too slow, paper stretching, reduce gloss, color printing will affect the stack, and a possible adhesion to the machine operator to bring a lot of trouble . At this time, should first check the pH value is correct, according to the level of pH value, amount of stabilizing agent, radiotherapy, or ethanol to adjust to water-based ink drying quickly.
4, pH value
Water-based ink containing a certain amount of ammonium solution used to enhance its stability or enhance the water resistance after printing, therefore, pH is an important indicator of value.
