Water based screen printing ink printing conditions

The printability of water based screen printing inks is affected by the objective conditions such as printing conditions, surface properties of substrates, ambient temperature and humidity, and the length of storage time. Therefore, some additives need to be finely adjusted to obtain the best ink The printing effect. Auxiliaries commonly used in water based screen printing ink pigment, pH stabilizers, slow drying agent, defoamers, dilute agent, the printing should be familiar with the characteristics and use of additives.

1) Color Used to deepen the color, the amount should generally be controlled at 0 to 30%, more than 30% will make the ink binder content is too low, resulting in decreased adhesion and wear resistance.

2) pH stabilizer is used to adjust and control the pH value of water based screen printing ink to make it stable at 8.0-9.5 to ensure the printing status of water-based ink. At the same time, it also adjusts the viscosity of water based screen printing inks and dilutes the ink.

3) Slow drying agent is used to reduce the degree of dryness of water based screen printing ink, slow drying agent can inhibit and slow down the drying speed of water-based ink to prevent the ink drying on the plate to reduce the blockage and paste version of printing failure occurs . The amount of slow-drying agent should generally be controlled at 0 to 10% of the total amount of ink, if the amount added too much, water based screen printing ink drying is not complete, the print will be dirty or odor.

4) Water based screen printing ink Diluent is mainly used to reduce the depth of color, dosage is not limited. But adding a lot of dilute agent may lead to a slight increase in ink viscosity, then add a small amount of diluent can be adjusted at the same time.

5) Dilution is mainly used to reduce the viscosity of ink, the dosage should be controlled within 3%, it will not reduce the color depth of water based screen printing ink, and can maintain the water based screen printing ink pH unchanged. Thinner should be added slowly while stirring to prevent viscosity too low. If you add more diluent or dilute tap water with high hardness will produce bubbles, defoamers should be added at this time.

6) Water based screen printing ink foam in the use of the main reason is that its use of water as a diluent in the emulsion polymerization must use a certain amount of emulsifier, the emulsion system greatly reduced surface tension.

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