Ink viscosity and dryness are particularly sensitive to changes in ambient temperature. As the temperature increases, the ink viscosity decreases and the drying speed becomes relatively fast; otherwise, the ink viscosity increases and the drying speed becomes slower. In addition, the humidity of the environment also has an effect on the drying of the ink. Generally speaking, it is better to control the temperature in the printing workshop at 18 ~ 25 ℃ and the humidity at 55% ~ 65%.
Ways to extend the shelf life of ink
1. The remaining ink after printing must be sealed and stored in a dark place, and can be reused in future production. Before re-application, it must be filtered with a filter mesh of more than 100 mesh, and mixed with new ink after sufficient stirring.
2. In some areas in the north, where the winter weather is severely cold, the ink should be prevented from being stored outdoors to prevent the ink from gelling at low temperatures. If the ink is gelled, it can be transferred to a warehouse with a higher temperature, or may be placed in hot water to restore the insoluble matter to its original state.
3. In the storage and management of ink, the principle of "first in first out" should also be followed, that is, the ink purchased first is used first to prevent the ink from affecting its use due to the long storage time.
4. The ink is best sealed to prevent dust. A large number of dust particles or various impurity particles are likely to fall into the ink tank or may be adsorbed on the appearance of the label material, thereby affecting the printing quality.
5. Safety first, keep ink away from fire and heat as much as possible to prevent accidents.
6. It is better to keep constant temperature in the ink warehouse, and the temperature difference with the printing workshop should not be too wide. If the temperature difference between the two is large, the ink should be placed in the printing shop early, which is not only conducive to the stability of the ink performance, but also ensures high production efficiency.
7. The ink also has a certain shelf life. If it is stored for too long, various ingredients in the ink formula may disintegrate and precipitate. Therefore, the ink should not be retained for a long time, the general retention period is about 1 year, otherwise it may affect the printing quality and even cause printing failure.
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