1. The influence of environment on the performance of label ink.
1) The effect of temperature and humidity at the printing site on the performance of ink. Ink viscosity and dryness are more sensitive to ambient temperature. As the temperature increases, the ink viscosity decreases and the drying speed becomes relatively faster; otherwise, the ink viscosity increases and the drying speed becomes slower. In addition, the environmental humidity also affects the drying of the ink. If the humidity in the workshop is too high, it is not conducive to the drying of the ink. On the contrary, if the workshop is too dry, it is easy to generate static electricity, which will cause a series of printing failures. Therefore, if there are conditions, it is best to set up air conditioners and humidity control equipment at the printing site, so that the temperature and humidity in the site are constant, which is conducive to the stability of the printing technology. Generally speaking, the temperature of the printing site should be controlled at 18~25℃, and the humidity should be controlled at 55%~65%.
2) The hygienic conditions of the printing site are also very important. If the hygienic conditions in the site are poor, a large number of dust particles and various impurity particles may fall into the ink tank and be adsorbed on the surface of the label material, affecting the printing quality. Therefore, the printing workshop should be kept clean, dust-free, and well ventilated.
Second, the impact of environment and climate on the storage and management of label inks.
1) It is best to maintain a constant temperature in the ink warehouse, and the temperature difference from the printing workshop should not be too different. If the temperature difference between the two is large, the ink should be put into the printing factory in advance, which is not only conducive to the stability of the ink performance, but also ensures the production efficiency.
2) In some northern areas, the climate is cold in winter, so avoid keeping the ink outdoors to prevent the ink from gelling at low temperatures. If the ink appears to gel, it can be transferred to a warehouse with a higher temperature, or put in hot water to restore the insoluble matter to its original state.
3) The ink also has a certain shelf life. If the storage is too long, the various components of the ink prescription may be separated and precipitated under the influence of the environment. Therefore, the ink should not be stored for a long time, and the general storage period is about 1 year. Otherwise, it may affect the printing quality and even cause printing failure.
4) The remaining ink after printing must be sealed and kept in a dark place, which can be reused in future production. Before using it again, it must be filtered with a filter of more than 100 mesh, and mixed with new ink after fully stirring.
