Characteristics of Water-Based flexo ink By ecat expertise Water based flexo ink has many of Characteristics, some of these Characteristic are physical and other are chemical because printing by using water based flexo ink become one of most important type of ink due to,flexo water based ink hasn’t bad effect in environment especially ,during production of water based flexo ink or during printing by using water based flexo ink. We can classify the flexo ink characteristic into physical Characteristic like, viscosity, appearance, odor, liquidity, glossy, drying time ….etc. And chemical Characteristic, like PH , chemical composition ,solubility,…etc. evaluating water based flexo ink Each one of previous Characteristic is very important in evaluating water based flexo ink before printing and during the printing also after print. That means the applicant must know well each of these Characteristics what it means and what's the effect of Characteristic in water based flexo ink as ink used for print the required designed. Such as viscosity is one of most important Characteristic to detect when you select your type of water based flexo ink before printing, selection of suitable type of ink has accepted required of Characteristic make the printing itself more easy for the operator who doing the printing process because viscosity controlled by the machine printing speed also type of anliox acts very important factor to avoid problems during printing process and suitable viscosity means ,recommended viscosity of water based flexo inks for the machine ,it means ,sometime the suitable ink for X machine should be medium viscosity ( around X sec. by Y equipment ) ,if water based flexo ink producer doesn'tconsider this range of required viscosity during producing the water based flexo ink ,many problems will happen during printing if the viscosity of water based flexo ink is higher this range or lower this range that’s why Characteristic of water based ink is very important to know before select your ink.
Flexographic printing standardization By ecat experts Based on film printing, the flexographic printing started out to conquer the world by this standardization. The corrugated board printing process stands at the beginning of this route. But the evolution will occur much faster than in other areas, because we can make use of the experiences from the already obtained results. The most important parameters and influence quantities are: *Reproduction *Printing inks *Presses *Anilox rollers *Printing plates *Printing substrates Reproduction: A flexographic printing plate can never be better than the film from which it is produced. Printing Inks About the inks, we will remember issues such as control of viscosity, missing process colors, etc. Especially the viscosity become a secret word in corrugated printing, Because no-one likes using a viscosity cup at the printing machine. Particularly in the half printing, specific minimum viscosities have to be used. To avoid blade streaks, you print ink from 25 sec to 35 sec by ford #4. As important as this is the precise experience about process colors and the pigment content of water based ink. Anilox Rollers. Anilox roll is connected to the same problems as the other parameters. So a lot of opinions are available, but these opinions often cannot be transferred from one operator to other. You also have to consider if the user mainly prints solid or halftones. Many machine operators do not know the screen count of the anilox roller, the cell volume or how much ink is transferred. Presses The flexographic direct printing press is the poor relative printing. In our countries Most of the today printing units were designed many years ago and they often remind us of stamping aggregates instead of printing units. Did you ever adjust the printing pressure to 10 micron with a handwheel which is used on these presses? With other printing presses these problem do not arise. Printing Substrate Today the printing substrate is the most important factor for the printing quality. For example, you cannot print a certain motif on a coated paper and afterwards, with the same quality, onto a brown kraft liner. Today you have to use only coated paper with high grammage. There are already existing many normal papers which can be printed excellently.
Qualified water based inks How can you sure it is a qualified water based ink? And what are Benefits? By ecat experts You can make a quality control sheet to compare between two water based ink suppliers and to ensure the quality of your ordinary supplier as following: pH: it is the main important parameter in water based ink and you can use pH-Meter to test Solid content: you simply can use oven and balance to compare at least three samples to get the best result. Viscosity: it can be measured by ford cup 4 or Brookfield. Gloss: you can compare it by using Gloss-Meter Fineness: as it affect the cylinder and Doctor Blade and it can be detected by Hegman Gauge Color Strength, transparency and different shades: can be compared by using X-Rite. Heat and Cold resistance, water, soap and alkali resistance, scratch: they can be measured by making a draw down and comparing both samples. Foam ratio: foam is major in water based system with ink movement (especially during color mixing, printing process) and it is affect the quality of your final printing so you should be aware how to control or prevent foam generation. Benefits of using qualified water based inks: You can save money specially by using less quantity of ink to get the best printing Makes sure that, your final product is permanent qualified and obtaining a consistent quality To make sure it is more stable qualified final product. To provide the cleanliness of image with no haloing areas Obtaining the optimum press operating speeds To save your viscosity and drying stability especially against bad effect of different pH changes. As you know standard pH range is 8-9 and if you have a higher pH it will cause lower viscosity and lower drying time. To minimize waste products during first printing trials