earticle

영어

The in creasing use of plastics in food packaging mat erials has led to the issue of food - packaging mutu al inter actions from residues in the plastics . Plastic films are commonly print ed by using solvent - based ink t o decorate the packaged food for consumer attention. However, the residual solvents can not be completely removed and they can migrat e into the contained food which lead t o undesir able off- flavors. Partitioning (Kp) of printing ink solvent s was studied in two types of pla stic films with differ ent chemical structu e and polarity. At 25 。C, Kp of toluene is higher than that of isopropan ol in PP, but isopropanol showed higher Kp value than toluene in EVOH. This showed that polarity had a significant effect on the partitioning of printing ink solvents into the plastic films. Printing solvent s had a higher affinity to the polymer with similar polarity that it did to the different one.