The properties of label printing ink mainly include hue, fineness, saturation, gloss, adhesion, viscosity, dryness, etc. these properties have important influence on printing process and printing quality. The effect of 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 environment temperature. When 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 slows down. In addition, the environmental humidity on the drying of ink also affect the humidity of the workshop is too high, is not conducive to drying ink; if the workshop is too dry, 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 clean, dust free and well ventilated and well ventilated.
UV label printing ink performance is good, reliable quality and wide range of application; but the price is high, and the need for special drying equipment, supporting materials also have certain requirements. In the choice of label printing ink to consider printing material type, printing and printing conditions, the special requirements of customers, finishing process, label use and use conditions, the cost of several factors.
Solvent based label printing ink has strong adaptability to label material, stable performance and high printing quality. However, there are environmental pollution problems, and some volatile solvents are harmful to human body.
Safety and health in water-based inks, no pollution, environmentally beneficial to human health; but there are also disadvantages, such as slow drying, color saturation is not high, poor stability, not printing large area field for a long time, prone to precipitation, stratification.
