[Office Partner Information Center] Factors affecting the quality of inkjet printers In addition to the performance of the machine and paper, it is necessary to count the ink. Today, Xiaobian will lead you to conceptually understand the ink, how to judge the ink quality, and why it can affect Print quality.
Printer ink classification
1. If classified according to color base, ink can be divided into:
Dye-type inks, which are dye-based inks, are also the inks used in most inkjet printers.
Pigment type ink - an ink based on pigment. 
2. If the ink is distinguished by solvent, it is divided into:
Aqueous ink - water and a water-soluble solvent are the main components of the dissolved chromophore.
Oily ink - a water-insoluble solvent is used as the main component of the dissolved chromophore.
The above concepts cross each other during actual use. For example, some pigment inks may be aqueous inks or oily inks. However, in terms of its nature and the actual requirements of the printer, water-based inks and oil-based inks are never allowed to be mixed in the same printhead.
The shelf life of ink is generally two years. The preservation of ink requires sealing, avoiding direct sunlight, and the temperature should not be too high or too low (normal room temperature can be).
Three major factors affecting ink quality
1. Purity of solvent in water
2. Humectant
Since the volatile components and moisture in the mouth will evaporate when the nozzle is idle, the moisturizing must pass.
3. Defoamer
If there are a large number of air bubbles in the ink cartridge during printing, it may cause interruption of printing or damage to the print head.
How to judge the quality of ink
1. Purity and salt content of raw materials
High-purity raw materials will better restore the saturation of the image and fully express the bright parts of the image; if the salt content is too high, the ink will produce a certain amount of alkali in the high-temperature inkjet process, resulting in blockage of the ink nozzle.
2, viscosity
The viscosity of the ink is too large, which will interrupt the ink supply during printing; the viscosity is too small, and the ink head will flow during the printing process.
Ink is generally classified into 1 to 8 weather resistance. The higher the number of grades, the longer the weather resistance. Including anti-UV, acid rain, moisture resistance, sand resistance and so on.
Because different inks have different chemical reagents and different solution compositions, regardless of the chemical composition and color system composition, Xiaobian puts forward some suggestions for everyone to use.
1. When converting indoor and outdoor inks, especially when converting indoors to indoors, please empty the original ink first, then clean the pipeline with cleaning liquid or pure water. Otherwise, the chemical substances in the ink may cause chemical reaction to block the nozzle.
2. Users of thermal foaming machines such as HP and NovaJet must empty the air when filling the ink. Otherwise, the ink head will be burned, the life of the nozzle will be reduced, or the ink head may be damaged, or the ink may be broken. .
3. Users of micro-piezoelectric machines such as Epson, Mimaki, Mutoh, Roland, etc., after using new ink, because the ink head and ink need to have a fusion time, it is normal for the test strip to break within a few hours;
If the ink is not produced in a single color or at all, or after a long time of use, there may be a phenomenon of ink breakage, which may result in insufficient ink (less than two-thirds) or excessive (enrichment) in the ink bag, or air in the pipe, scraping The film and the waste ink pad are caused by too much ink; it is best to manually empty the pipe air and handle the ink bag portion, and clean the dirty portion.
4, piezoelectric machine is best to print test drawings every day to keep the nozzle moist; long-term shutdown, should be turned on once a week to ensure that the ink pipe is smooth and the ink head is wet.
Ink ink plug rate
Since the ink can only use neutral ink and does not react with any material, the ink must be attached to the coating. The water-based PIGMENT ink is used to extend the outdoor weathering time and improve the waterproof performance. UV (UV) is added to the ink, and UV is added. The composition and the plugging rate can be said to be proportional to each other. Therefore, when the UV component is too high, the plugging phenomenon will occur. Therefore, the aqueous pigment ink must also cover the ultraviolet shielding film to ensure outdoor weathering time. The UV component in the ink must be in a certain proportion. Otherwise, the plug is inevitable. After the ink has waterproof performance, without any protective measures, the outdoor weather resistance is less than eight months, it is not easy to cause plugging, otherwise it must be coated with UV glue. Therefore, the solvent ink can only reduce the UV component to reduce the plugging rate, and the weathering period of the solvent can not exceed 2 months.
Resistance to performance
Regardless of the ink or ink, the difference in the type of solvent is the difference between the use of dye and pigment. In general, the resistance of dyes is far less than that of pigments, and the resistance level of dyes varies from one color to another; Magenta is the worst, Cyan (green), yellow (yellow) ) and Black (Black) is far better than Magenta. The weather resistance of the pigments is better for each color, and the resistance level is on average from six to eight.
In fact, in addition to the color factor, the formulation of the ink is the key to the weather resistance of the ink, in addition to the use of mild and non-corrosive solvents, heat-resistant agents, UV absorbers, antioxidants, and free radical grabbing agents. Adding can enhance the weather resistance of the ink dye;
In addition, the selection of the protective film on the coating layer material is also one of the important factors affecting the performance of the weathering;
In addition, its weather resistance will also vary with the time and length of the external environment, the humidity of the area, the length of daylight exposure, the orientation of the picture, and the climate of the place.
Therefore, the length of the anti-waiting period is guaranteed to be absolute. In fact, it is impossible to make the same guarantee in terms of professional technology and evaluation from different angles. This is an absolute guarantee different from ordinary items.
At the end of the article, Xiao Bian summarizes some of the questions that users often ask and answers, hoping to let you know more about the impact of ink on print quality.
1. How does viscosity affect printing?
Viscosity is absolutely important for inkjet printing. To get the best performance of inkjet printers, the viscosity of the ink must be kept within a certain range. How to make the viscosity too high, the ink will block the nozzle. If the viscosity is too low, the air will be reversed. Flow back to the nozzle, causing ink leakage. By maintaining the viscosity within the specific range, the maximum density can be obtained without ink or ink leakage.
2. What is the relationship between temperature and viscosity?
The increase in ink viscosity is generally due to the fact that the ink jet printer is operated in a colder environment and becomes thicker as the ink cools. The simple solution is to increase the temperature and keep the environment in the studio above 20 degrees Celsius. . Lower temperatures also cause the adhesion of the ink on the media to diminish and the dots to appear.
3. If the viscosity is too high or too low, what is the relationship between painting and painting?
If the viscosity is too high, you will start to see a decrease in density as the ink drops become less. If the ink is too thick, the ink droplets will no longer come out of the nozzle and will stop printing with the right to use.
If the viscosity is too low, the ink will flow out of the printhead and cause air to flow back into the ink chamber.
4. What is the relationship between surface tension and inkjet?
Surface tension is the attraction between molecules on the surface of a liquid. For example, if you look at the raindrops on the window, the beginning of the circle is caused by surface tension. The water molecules are tightly concentrated to form a hemisphere. The tension of pure water is very high, about 75 (to reach a square centimeter). Most organic solvents are very low, about 25 dynes square centimeters. This is why oily solvents are even better.
But since the plane tension of water is so large, why can I use water-based inks? This is the beginning of chemistry. Since the water is hydrolyzed by pure water, the water molecules are tied together, so the surface tension is increased. A chemical element called "wet basis" is added to the aqueous ink. This wet-based molecule has one end in contact with water, breaking the hydrogen bond and the other contacting the substrate. The wet base reduces the surface tension of the ink. And damp the substrate, another alcohol-like solution, can also reduce the surface tension of the aqueous ink.
5. What is added to the water-based protective film?
The water-based protective film is an aqueous protective film containing both alcohol components. Sprinkling has three functions; reducing surface tension and making water-based protective film
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