With the continuous improvement of people’s quality of life, packaging bags have become one of the indispensable items in our daily life. Plastic packaging bags have brought great convenience to people’s lives. When we see a bag, it is full of beautiful patterns and texts. Of course, it also contains some sales information of merchants and enterprises. Therefore, today, Jianhongxing Packaging would like to discuss these printings with you. Whether the patterns and characters in the pictures are harmful to our human body.Plastic packaging ink is mainly composed of pigments, bonding agents, solvents and auxiliary agents. Among them, organic solvents and heavy metals are harmful to human body.Ink is divided into two types:Inorganic and organic pigments. Both are insoluble in water and other media, with bright colors and good stability. Some inorganic pigments contain lead, chromium, copper, mercury and other heavy metal elements, which are toxic to a certain extent and cannot be used to print food packaging and children’s toys. Some organic pigments contain biphenyl gum, which contains carcinogenic ingredients and should be strictly prohibited. Organic solvents can dissolve many natural and synthetic resins, which are important components of various inks, but some of them can damage the human body and subcutaneous fat. Prolonged exposure can cause chapped and rough skin. If it penetrates into the skin or blood vessels, it will harm human blood cells and hematopoietic function as well as blood. It is inhaled into the trachea, bronchi, lungs or spread to other organs through blood vessels and lymphatic vessels, and may even cause chronic poisoning of the body. Some inks have toxicity issues with heavy metal ions. Pigments and dyes contain carcinogenic ingredients and are harmful to human health.large number of inks, organic solvents and adhesives are used in the printing of composite packaging materials. Although these auxiliary materials have no direct contact with food, some toxic substances will migrate into food during food packaging and storage, endangering people’s health.Organic solvents such as ethanol, isopropanol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, and xylene are often used in printing inks. Although most solvents can be removed by drying, residual solvents can migrate into food and pose a hazard to humans. Solvents used in gravure printing inks are butanone, xylene, toluene, butanol, etc. Butanone, in particular, has a strong residual odor. Because the pigment particles in the ink are very small and have strong adsorption capacity, although they have been heated and dried during the printing process, they are usually not completely dried due to the short time and speed. Especially for printed matters with large ink area and thick ink layer, there are more residual solvents. These residual solvents are carried over to the compounding process where they are more difficult to escape after compounding and will migrate and permeate slowly.Therefore, only by keeping the solvent remaining on the plastic packaging bags to a minimum can people’s health be protected to the greatest extent.