The additives commonly used in water-based inks mainly include pH stabilizers, defoamers, quick-drying agents and slow-drying agents.
1. pH stabilizer: The pH stabilizer is mainly used to adjust the pH value of ink.
The problem of the pH value of ink is often mentioned by various ink manufacturers to promote ink products to printing companies. Low pH value is easy to cause ink agglomeration. If the pH value is high, the viscosity is relatively low. Generally, the pH value of the ink should be detected during the printing process. When the pH value is lower than 8, an appropriate amount of pH stabilizer should be added to keep the ink in a good printing state. The pH value of water ink in European countries is neutral. When the pH value is adjusted to 8.5, its fluidity and gloss reach the best state, but during the printing process (within 1 hour), due to the volatilization of amine solvents, the viscosity of the ink It will increase rapidly, the gloss will decrease, the fluidity will deteriorate, and a large number of unqualified products will appear. If you adjust the pH, you need to add amine solvents, and during the printing process (within 1 hour), you need to constantly check (with acidity Plan), a little carelessness, waste products will appear, and the entire workshop is filled with an unpleasant odor, such products are regarded as bad in the printability, such as the pH value of ink is between 7-8, ink The stability is the best. Users can add pure water as a solvent to reduce the viscosity, which will not increase the cost, and will also reduce the taste of the ink resin.
2. Defoamer:
If the ink viscosity is too high, the pH value is low, the printing speed is fast, and the printing technician adds too much water, it is easy to produce bubbles. When the air bubbles are relatively large, there will be phenomena such as whiteness of the printed product and low ink infusion, which will seriously affect the printing quality. It is generally recommended to add two kinds of foam inhibitors and surface defoamers to the ink mixture to solve the foaming phenomenon of the ink. The use ratio is 1 to 2%.
3. Quick-drying agent:
In the process of using ink, due to the different resin selected by the ink manufacturer or the speed of the machine being too fast, it may cause the ink to dry more slowly. Accelerating the desiccant can adjust the drying speed of the ink to meet the requirements of the printing machine speed and improve the production efficiency. Its use ratio is 2 to 3%.
Fourth, slow drying agent:
The slow-drying agent can inhibit and slow the drying speed of the ink, play a moisturizing role, prevent the ink from drying on the printing plate or the anilox roller, and reduce the occurrence of printing failures such as blocking and paste printing. The use ratio is between 1 and 2% .
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