How to reduce the amount of solvent residue when printing food packaging?
The amount of solvent residue has always been a problem that plagues ink companies. The state has already required the residual amount of benzene solvents to reach 3? /? Below in the hygienic requirements of BOPP / PE composite packaging. Improving, how to reduce the amount of solvent residues in the brushes of food packaging printers, has become a major issue for ink companies to consider.
1. Among the three resins of EVA-40W, MP-45 and CL-PP, the solvent residual amount brought by CL-PP is often the highest, and the solvent residual amount brought by EVA-40W is the least, so the compound strength can be guaranteed Under the conditions, the content of CL-PP can be appropriately reduced and the content of EVA-40W can be increased.
2. Select the appropriate CL-PP. The amount of solvent residues caused by CL-PP from different manufacturers in the composite ink varies greatly. If the formulation cost is acceptable, PP803MWS produced by Japan 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 solvent in the ink film.
4. Check whether the solvent used for the ink and the solvent used in the printing machine brush are pure. If there is a small amount of high-boiling solvent, the residual amount of the solvent may be too high, and even the printed product may have serious odor.
5. Adjust in the process of printing and compounding:
â‘ Toluene solvents should be used as little as possible when preparing dilute solvents. A mixed solvent of toluene: acetic acid: butanone = 2: 5: 3 can be used;
â‘¡In 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 the conditions permit, you can open the drying tunnel for multiple drying after the white ink is printed;
â‘¢In the process of printing, the viscosity of ink can be reduced appropriately.
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