How to reduce the amount of solvent residue when printing Food Boxes?

How to reduce the amount of solvent residue when printing Food Boxes?

The problem of solvent residues has always been a problem that plagues ink companies. The country has already requested that the residual amount of benzene solvents must be less than 3㎎/㎡ in the hygiene requirements of BOPP/PE composite packaging. As people's requirements for food hygiene continue To improve, how to reduce the solvent residue in the food packaging printing machine brush has become a key consideration for all ink companies.

1. Among the three resins of EVA-40W, MP-45 and CL-PP, CL-PP often brings the highest solvent residue, and EVA-40W brings the least solvent residue, so it can guarantee the composite strength Under these conditions, the content of CL-PP can be appropriately reduced and the content of EVA-40W can be increased.

　　2. Choose the appropriate CL-PP. The amount of solvent residues caused by CL-PP from different manufacturers in composite inks varies greatly. If the cost of the formulation is acceptable, PP803MWS produced by Nippon Paper can be used. Under the same dosage, it can generally be reduced to 50%.

　　3. When dissolving EVA-40W, MP-45 and CL-PP, adding a part of ethyl ester and residual solvent reducing agent can effectively reduce the residual amount of toluene solvents in the ink film.

　　4. Check whether the solvent used in the ink and the solvent used in the printing machine brush are pure. If there is a small amount of high boiling point solvent, it may cause too much solvent residue, and even cause serious peculiar smell in the printed matter.

　　5. Adjust in the process of printing and compounding:

　　① When preparing the dilution solvent, use toluene solvents as little as possible. You can choose a mixed solvent of toluene: acetic acid: butanone = 2:5:3;

　　②In the printing process, increase the exhaust air in the drying tunnel of the printing press, and appropriately increase the temperature of the drying tunnel. If conditions permit, open the drying tunnel for multiple drying after the white ink is printed;

　　③In the printing process, the viscosity of the ink can be appropriately reduced.

https://www.minongpackaging.com/paper-box/food-boxes/food-boxes-for-sandwich.html