With the economic development, the wide application of labels in commodities has driven the rapid development of the label printing industry. However, at present, people do not know much about label printing inks than label materials and printing methods. Label printing inks, such as a mysterious field, urgently need to be recognized and explored.
There are many types of label printing inks. According to the different solvents used, they can be divided into three categories-water-based label printing inks, solvent-based label printing inks and UV label printing inks:
1. Water-based ink is safe and hygienic, non-polluting, meets environmental protection requirements, and is beneficial to human health; however, it also has shortcomings, such as slow drying speed, low color saturation, and poor stability. , Layering phenomenon.
2. Solvent-based label printing inks have strong adaptability to label materials, stable performance, and high printing quality; but there are environmental pollution problems, and some volatile solvents are harmful to humans.
3. UV label printing ink has excellent performance, reliable quality, and wide application range; but the price is relatively high, and requires special drying equipment, and also has certain requirements for supporting materials.
When selecting label printing inks, it is necessary to comprehensively consider several factors such as the type of printing material, printing method and printing conditions, customer's special requirements, post-press processing technology, label use and use conditions, and cost. The performance of label printing ink mainly includes hue, fineness, saturation, gloss, adhesion, viscosity, dryness, etc. These properties have an important impact on the printing process and printing quality.
The influence of the printing workshop environment on ink performance and printing quality is mainly reflected in the following two aspects:
(1) The viscosity and dryness of the ink are sensitive to the ambient temperature. As the temperature increases, the viscosity of the ink decreases and the drying speed becomes faster;
On the contrary, the viscosity of the ink increases and the drying speed becomes slower. In addition, the humidity of the environment also affects the drying of the ink. Too high humidity in the workshop is not conducive to ink drying; if the workshop is too dry, it is easy to cause printing failure due to static electricity.
(2) The sanitary condition of the printing workshop is also very important. Therefore, the printing workshop should be kept clean, free of dust, and well ventilated and exhausted.
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