The program SML is a joint development of the Federal Food Safety and Veterinary Office (FSVO, Switzerland), the company Advanced Kinetics and Technology Solutions AG (AKTS AG, Switzerland) and MDCTec Systems GmbH (Germany).

The verification of compliance of food packaging by the application of recognized diffusion models was introduced in recent the European legislation.

Employing advanced Finite Element Analysis (FEA) migration modelling with the SML software [1] predicts the migrating amount of organic substance like residual monomers, additives, contaminants, reaction products, non-intentionally added substances from plastic multi-layer or multi-material multi-layer materials into the packed food or other contact media like pharmaceuticals, cosmetics, drinking water or environment. The presented method insures the compliance of plastic food contact materials and articles with specific migration limits according to EU Regulations [2,3] and Swiss Legislation [4]. The technique allows the specific migration assessment for complex materials, e.g. different geometries and any multi-layer structure. Simulation of the migration process is based on Fick’s 2nd law of diffusion under consideration of partitioning between adjacent layers or contact media in closed systems [1-4]. Temperature dependence of the diffusion process is considered by the Arrhenius equation. Diffusion coefficients of substances in polymer are estimated by generally recognised estimation procedures like the Piringer model based on polymer specific constants (AP-values) [2] which are available for a limited number of polymers. Extension of the AP value model by Brandsch [5] for estimation of diffusion coefficients based on the glass transition temperature of polymers opens modelling opportunities for any polymer or polymer mixture which is characterised by a glass transition temperature. Estimation of partition coefficients between contact layer and contact medium (e.g. polymer and food simulant or water) is based on the migrants polarity expressed by the octanol/water partition coefficient of the substances [6]. Time dependent migration curves and the concentration profile inside all layers of multi-layer structures can be computed for both, migrant from the material and from the contact medium. Simulation of release of substances from multi-layer materials in extended temperature ranges and under temperature conditions is possible at which experimental investigation would be very difficult, e.g. when temperature fluctuates during the observation time occur. Complex surrounding temperature profiles can be considered such as stepwise, modulated, shock and additionally for temperature profiles reflecting real atmospheric temperature changes (yearly temperature profiles of different climates with daily minimal and maximal fluctuations).

Download AKTS-SML Demo
Version 5.092 |  *.zip | 13.8 MB

(Note: Simply download the above *.zip file and doubleclick on it. Username : admin, Password : admin)
Click here to see our video webinar and learn the basics of AKTS-SML software.

AKTS-SML Version 5 – Tutorial and Method