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 inks are safe, hygienic, non-polluting, and meet environmental protection requirements. It is beneficial to human health; however, it also has shortcomings, such as slow drying speed, low color saturation, and poor stability. It is not suitable for printing on a large area, and long-term storage is prone to precipitation and delamination. ⑵Solvent-based label printing ink has strong adaptability to label materials, stable performance, and high printing quality; but there are environmental pollution problems, and some volatile solvents are harmful to the human body. ⑶UV 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; (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. In the printing process, we often encounter problems such as poor ink fastness, poor ink drying, ink layer adhesion, bubbles, paste plates, dry plates, poor ink transfer, and color deviation. The analysis of these failures is as follows: (1) Poor adhesion of ink. Cause: The surface tension of the printing material is too low, the type of ink and printing material does not match, and the performance of the ink is poor. Solution: Perform surface treatment on the printing material, add wetting agent to reduce ink tension, and replace ink. (2) Poor drying of ink. Reasons: Improper ink solvent ratio, too fast printing speed, high environmental humidity, etc. Solution: Adjust the solvent ratio, reduce the printing speed appropriately, increase the drying temperature, and reduce the environmental humidity. (4) Bubbles. Cause: The ink contains air, the surface tension of the ink is too large, the viscosity of the ink is too low, and the printing speed is too fast. Solution: Add proper amount of defoamer, adjust ink viscosity, and reduce printing speed appropriately. (5) Paste edition. Reasons: The ink pigment particles are too coarse, the ink viscosity is too high, the inking volume is too large, and the printing pressure is too high. Solution: replace the ink, reduce the viscosity of the ink properly, reduce the amount of ink, and reduce the printing pressure. (6) Dry version. Reasons: Ink drying speed is too fast, drying temperature is too high, printing speed is too slow, etc. Solution: Adjust the ink solvent ratio, reduce the drying temperature appropriately, and increase the printing speed. 7) Poor ink transfer. Cause: The type of ink and printing material do not match, the viscosity of the ink is too high, and there is static electricity. Solution: replace ink, adjust ink viscosity, add antistatic agent. (8) Color cast. Reasons: Ink hue deviation, inappropriate ink drying speed, poor ink stability, performance of the printing material, printing process changes, etc. Solution: replace ink, adjust solvent ratio, adjust printing process parameters, etc. (9) Static electricity. Reason: the ink is too thin, the printing speed is too fast, the environment is too dry, etc. Solution: Add antistatic agent, increase ink viscosity, reduce printing speed appropriately, adjust environmental humidity, etc. During the printing process, the following issues should also be noted: (1) Use the same brand of ink produced by the same ink manufacturer to avoid printing failures of different manufacturers and different types of ink. (2) The ink is fully stirred before use, and it should be stirred frequently during the printing process to ensure that the ink system is evenly dispersed. (3) Do not use too much ink every time, and should follow the principle of "less addition, diligent addition", which is conducive to the stability of ink performance and can effectively avoid waste; recording. (4) During the printing process, in order to ensure the quality of the label prints and the smooth production, certain additives should be added to the ink, such as antistatic agents, defoamers, and tack removers. Within the specified range. (5) There are many deficiencies in label printing inks on the market. The most prominent problem is the ink hue deviation: On the one hand, the hue of the same kind of ink produced by different ink manufacturers is different; on the other hand, even if the same kind of inks produced by the same manufacturer have different batches, the hue will also deviate, sometimes even very large. For this reason, printing factories often have to shut down for debugging, which is very unfavorable to the stability of printing quality, which brings great inconvenience to production and seriously hinders the improvement of printing quality. There is still a certain gap between domestic inks and imported inks, especially in high-end products. Domestic ink manufacturers should improve the technical level and production capacity as soon as possible to drive the improvement of the entire ink manufacturing level. In order to achieve a better preservation effect, the label printing ink should be stored in a sealed container under normal temperature, cool, dry, dark and ventilated environment. During the storage and management of label printing inks, the following issues should also be noted: (1) Safety first, keep ink away from fire and heat as much as possible to prevent accidents. (2) It is best to maintain a 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 put into the printing workshop in advance, which is not only conducive to the stability of the ink performance, but also ensures the high efficiency of production. (3) In some areas in the north, the winter is relatively cold, so you should avoid storing the ink outdoors to prevent the ink from gelling at low temperatures. If gelation occurs, transfer it to a warehouse with high temperature or put it in hot water to restore the insoluble matter to its original state. (4) The principle of "first in first out" should be followed in ink storage and management, that is, the ink purchased first is used first to prevent the ink from affecting its use effect due to the long storage time. (5) The ink also has a certain shelf life. If it is stored for too long, various components in the ink will separate and precipitate. Therefore, the ink should not be stored for a long time, and the general storage period is one year. (6) After printing, the remaining ink must be sealed and stored in a dark place. Before re-use, it must be filtered with a filter mesh of more than 100 mesh, mixed with new ink after fully stirred. (7) Label printing factories should effectively manage label printing inks. The specific measures are as follows: label printing factories generally need to set up special material management departments to be responsible for the unified management of raw and auxiliary materials including inks, and establish perfect material management. System, formulate reasonable procedures for incoming and outgoing materials, and implement strict procedures for entering and leaving warehouses. That is, a person in charge is responsible for the management of the ink, and the ink products are partitioned to avoid misleading and misuse. In addition, make a detailed record of the type, origin, batch, quantity and use of ink to ensure product traceability.
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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.
(3) Ink adhesion. Reasons: Ink drying is poor, ink is too soft, printing pressure is too high, environmental humidity is too high, etc. Solution: adjust the ink solvent ratio, add an appropriate amount of anti-sticking agent, increase the drying temperature, reduce the printing pressure, reduce the environmental humidity, etc.
Analysis of mysterious inks for label printing