A user-friendly simulation tool to predict the migration from multi-layer materials.

This page describes briefly DIFFUSION_1DFV2n and its features.

DIFFUSION_1DFV2n was developed by INRA.

What does DIFFUSION_1DFV2n.sfpp3.html mean?

History of DIFFUSION_1DFV2n

DIFFUSION_1DFV2n is a scientific software developed and running on the framework SFPP3. DIFFUSION_1DFV2n was partly funded by the EU project MIGRESIVES (FP 6th Framework Programme Horizontal research activities involving SMEs Collective Research). It bridges within a nice and rich-content browser page several tools previsously available in separated pages of the on-line version of the SAFE FOOD PACKAGING PORTAL.
In particular, DIFFUSION_1DFV2n includes:

Features implemented in DIFFUSION_1DFV2n

As recommended in the framework SFPP3, DIFFUSION_1DFV2n relies on new Web 2.0 standards allowing end-users to run a professional scientific-application entirely through a web browser. The new rich and user-friendly interface makes it possible to own and exercise control over complex input data (e.g. multilayer structures, arbitrary temperature cycle, variable contact conditions, arbitrary activation laws...), large databases and simulation results. All results can be plotted, compared, tracked and analysed from any modern web browser. In addition, DIFFUSION_1DFV2n offers specific substance links (more than 1,200) to the largest chemical databases publicly available on-line (NIST, NCBI/NIH, EPA, Chemspider databases).


DIFFUSION_1DFV2n is subjected to the distribution license of SFPP3 and to a specific license described here.

The National Institute for Agricultural Research is a mission-oriented public research institution Founded in 1946 under the joint authority of the French Ministry of Higher Education and Research and the Ministry of Agriculture and Fisheries.
Ranked the number one agricultural institute in Europe and number two in the world, INRA carries out mission-oriented research for high-quality and healthy foods, competitive and sustainable agriculture and a preserved and valorised environment.
Molecular diffusion, often called simply diffusion, is a net transport of molecules from a region of higher concentration to one of lower concentration by random molecular motion. The result of diffusion is a gradual mixing of material. In a phase with uniform temperature, absent external net forces acting on the particles, the diffusion process will eventually result in complete mixing or a state of equilibrium.
Molecular diffusion is typically described mathematically using Fick's laws.
A sorption isotherm (also adsorption isotherm) describes the equilibrium of the sorption of a material at a surface (more general at a surface boundary) at constant temperature. It represents the amount of material bound at the surface (the sorbate) as a function of the material present in the gas phase and/or in the solution. Sorption isotherms are often used as empirical models,[1] which do not make statements about the underlying mechanisms and measured variables. They are obtained from measured data by means of regression analysis. The most frequently used isotherms are the linear isotherm or Henry isotherm, Freundlich isotherm, the Langmuir isotherm, and the BET model.
The finite volume method is a method for representing and evaluating partial differential equations in the form of algebraic equations. Similar to the finite difference method, values are calculated at discrete places on a meshed geometry. "Finite volume" refers to the small volume surrounding each node point on a mesh. In the finite volume method, volume integrals in a partial differential equation that contain a divergence term are converted to surface integrals, using the divergence theorem. These terms are then evaluated as fluxes at the surfaces of each finite volume. Because the flux entering a given volume is identical to that leaving the adjacent volume, these methods are conservative. Another advantage of the finite volume method is that it is easily formulated to allow for unstructured meshes. The method is used in many computational fluid dynamics packages.
The Project MIGRESIVES COLL-CT-030309
Most food packages and food contact materials are manufactured using adhesives. The EU regulates food contact materials, as their constituents should not contaminate food and endanger consumer’s health. In contrary to plastics which are regulated by positive lists of authorised ingredients, adhesives are not yet covered by a specific regulation. The MIGRESIVES project wants to elaborate a scientific based risk assessment approach to meet current general EU regulatory requirements. The project outcome may also form a basis for future specific EU legislation and provide industry, especially small and medium sized enterprises, a tool to ensure that migration from adhesives is in compliance with the regulatory requirements.

The concept will be built on the following pillars:
  • (i) classification of adhesives according to chemistry and uses
  • (ii) test strategies based on physico-chemical behaviour of adhesives
  • (iii) modelling migration/exposure from adhesives
  • (iv) providing guidelines to integrate the risk assessment approach into the daily life of companies and
  • (v) extensive training/education to SMEs and large dissemination for general adoption of the concept in Europe.
WEB 2.0
"Web 2.0" refers to web development and web design that facilitates interactive information sharing, interoperability, user-centered design and collaboration on the World Wide Web. Examples of Web 2.0 include web-based communities, hosted services, web applications, social-networking sites, video-sharing sites, wikis, blogs, mashups and folksonomies. A Web 2.0 site allows its users to interact with other users or to change website content, in contrast to non-interactive websites where users are limited to the passive viewing of information that is provided to them.
Although the term suggests a new version of the World Wide Web, it does not refer to an update to any technical specifications, but rather to cumulative changes in the ways software developers and end-users use the Web. Whether Web 2.0 is qualitatively different from prior web technologies has been challenged by World Wide Web inventor Tim Berners-Lee who called the term a "piece of jargon".


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