Ink is the basic material of custom puzzle books printing, and poor ink is also the main source of food carton pollution. Now there are a variety of inks, performance is not the same. Traditional packaging printing inks are mainly resin and solvent-based printing inks, which contain harmful substances such as heavy metals, organic volatiles and solvent residues, among which solvent-based printing inks contain harmful solvents such as benzene, ethyl acetate, isopropyl alcohol and n-butyl ester. With these two types of inks for printing, the heavy metal elements in the ink are transferred through the packaging, and the human body may cause heavy metal poisoning after direct or indirect intake. Pigment is one of the main substances in the production of ink, if the ink factory uses dyes to replace pigments, then the migration of dyes will also affect the safety of food cartons. In addition, if some accelerators such as siloxanes are added to improve the adhesion of the ink, it will make the ink contain harmful substances such as methanol, which will also affect the safety of food packaging. With the continuous enhancement of people's awareness of environmental protection, hygiene, health and safety, "green food needs green packaging" has become the consensus of the food packaging and printing industry. Food packaging products need to use green ink for printing, which is already an inevitable trend of commodity economy and market development laws. The author believes that the offset printing process of food cartons must be printed with ink made of synthetic pigments and synthetic resins without heavy metals and organic solvents. Soybean ink is a new type of environmental protection ink, it is the use of soybean oil to replace the mineral oil in the ink, made of soybean oil-based ink to replace ordinary petroleum-based ink, because soybean oil is a safe and sanitary substance, made of ink non-toxic, tasteless, can better avoid the pollution of the product. Therefore, our company chooses soybean ink for printing when printing food cartons. In recent years, some fashionable drinks and food markets are hot, the output is quite high, and some packaging factories aim at market dynamics and use flexo printing process for printing. This is because the ink of flexo printing process has great advantages in environmental protection, health and safety. The diluent of the water-based ink used in the process is water and ethanol, which is a non-toxic solvent and has a high safety factor. Flexo printing can also be printed with UV ink, its drying speed, printing quality is better than the printing quality of solvent-based ink and water-based ink, it is also a recognized pollution-free environmental protection ink, in the field of food packaging printing has a broad market. Due to the use of flexographic ink printing, can not spray powder, effectively avoid dust pollution and printing sticky dirty problems. Therefore, only the correct understanding and selection of ink can better improve the safety of food cartons

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