What is the difference between water-based ink and oil-based ink for photo machine?

Oil-based ink is to dilute the pigment in oil, such as mineral oil, vegetable oil, etc. The ink adheres to the medium by oil penetration and evaporation on the printing medium; water-based ink uses water as the dispersion medium, and the ink is on the printing medium The pigment is attached to the medium through water penetration and evaporation.


The inks in the photo industry are distinguished according to their uses. They can be divided into two types: One is, water-based inks, which use water and water-soluble solvents as the main components to dissolve the color base. The other is oil-based ink, which uses non-water-soluble solvents as the main component to dissolve the color base. According to the solubility of solvents, they can also be divided into three types. First, dye-based inks, which are based on dyes, are currently used by most indoor photo machines; second, pigment-based inks, which are based on Pigment-based inks are used in outdoor inkjet printers. Third, eco-solvent ink, somewhere in between, is used on outdoor photo machines. Special attention should be paid to these three kinds of inks cannot be mixed. Water-based machines can only use water-based inks, and oil-based machines can only use weak solvent inks and solvent inks. Because the ink cartridges, pipes, and nozzles of water-based and oil-based machines are different when the machine is installed, Therefore, the ink cannot be used indiscriminately.


There are five main factors affecting ink quality: dispersant, conductivity, PH value, surface tension, and viscosity.

1) Dispersant: It is a surface active agent, its function is to improve the physical properties of the ink surface, and enhance the affinity and wettability of the ink and the sponge. Therefore, the ink stored and conducted through the sponge generally contains a dispersant.

2) Conductivity: This value is used to reflect the level of its salt content. For better quality inks, the salt content should not exceed 0.5% to avoid the formation of crystals in the nozzle. Oil-based ink decides which nozzle to use according to the particle size of the pigment. Large inkjet printers 15pl, 35pl, etc. determine the accuracy of the inkjet printer according to the particle size. This is very important.

3) PH value: refers to the pH value of the liquid. The more acidic the solution, the lower the PH value. Conversely, the more alkaline the solution, the higher the PH value. In order to prevent the ink from corroding the nozzle, the PH value should generally be between 7-12.

4) Surface tension: It can affect whether the ink can form droplets. The better quality ink has low viscosity and high surface tension.

5) Viscosity: It is the resistance of the liquid to flow. If the viscosity of the ink is too large, it will interrupt the ink supply during the printing process; if the viscosity is too small, the ink head will flow during the printing process. Ink can be stored for 3-6 months at normal room temperature. If it is too long or will cause precipitation, it will affect the use or plugging. The ink storage must be sealed to avoid direct sunlight. The temperature should not be too high or too low.

Our company exports a large quantity of indoor and outdoor inks,such as eco solvent ink, solvent ink,sublimation ink,pigment ink and has more than 50 local warehouses abroad. We can provide you with consumables at any time to ensure uninterrupted work. Contact us to get your local ink prices.

Post time: Dec-15-2020