Read Models for the Migration of Additives in Polyolefins (Classic Reprint) - L E Smith | PDF
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Models for the Migration of Additives in Polyolefins (Classic Reprint)
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Simple models for assessing migration from food-packaging films.
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An effect on the blooming of additives and consequently the migration of substances migration modeling, which is now an accepted tool for compliance testing.
This paper discussed the present status and progress of research on migration model of the small molecular additives in food contact plastic at home and abroad, the deterministic model and non-deterministic model research and theoretical issues which need to be resolved were emphatically introduced, the development of migration theory model.
Matical models to predict migration of additives from food-contact polymers.
Exposure estimates for non-substantive additives may be based on migration studies, or alternatively, on scenarios involving partitioning of the additive between paper fibers and slurry water.
A simple and friendly-to-operations am file format is then proposed to exchange data between cad models and the am process, its performance of data migration is evaluated and 3d printing experiment is carried out to validate the feasibility of the data migration.
Migration of conventional model transfer format on additive manufacturing.
The results indicate that the weibull model can be used to describe and analyze the migration of additives from plastics to foods with a meaning of the parameters in terms of the underlying physical phenomena.
To reduce the amount of compliance testing for food contact polymers the use of migration modelling has been proposed. This study was conducted to provide valid data for the independent evaluation of two such diffusion-based models using a range of different high density polyethylene (hdpe) polymers and plastics additives.
Trends amongst common species according to their migration pattern. Migrants were described by fitting log linear regression models to point-count census.
The migration of chemicals from food contact materials into foods is an important issue in food models describing the mass transfer of additives and other con-.
The considered additives, where we assume that we have a certain diffusion in the undisturbed polymer layer and a much improved mobility of the additive in the swollen layer and concentration jump at the interfaces. Rudolph particularly considered the consequence of the model. The following general formula relates the migration of an additive.
Some chemicals in the food container or packaging would migration after contacting with food for a long time. We analyze three classical plasticizer migration models in china, and give contrast analysis. Then we measured the antioxidants migration status under different circumstances, getting the original experimental data.
Owing to their simplicity, two migration models based on fick's second law have been frequently used for the assessment of migration of additives and contaminants from food-packaging films. While the two models are known to provide accurate estimates of diffusion coefficients for complete migration, they could generate considerable estimation.
Potential migration of the substance (at max use level in 'worse-case' plastic(s)) was assessed by:-m-clay m-tio2 a) theoretical considerations, migration modelling b) specific migration from plastic(s) into simulants using an element as indicator c) migration test using a surfactant solution to stabilise nps followed by malls and af4-icp-ms.
It was possible with a newly developed model to estimate the migration with very high accuracy. This result leads to the somewhat surprising conclusion that the controlling step in the migration of the additive to the surface was not the migration within the polymer bulk. Migration is probably due to a temperature dependent partitioning.
(1999) compared these two solutions for the migration of a number of additives from hdpe into olive oil, and found that the fda model was more accurate in most situations, but underestimated the results more frequently. In europe, the piringer model has been evaluated and a comparison of model predicted values with experimental.
Migration of low molecular weight additives in polyolefins and copolymers. Modelling the migration of additives from polymer films to foods and food simulating liquids.
The transport and deposition of polydispersed expiratory aerosols in an aircraft cabin were simulated using a lagrangian-based model validated by experiments.
This migration standard doesn’t account for bioaccumulation of chemicals found in multiple products within a person’s diet. And many of the health issues associated with food additives.
Low-density polyethylene (ldpe) films additivated with the three model migrants (bzp, dpbd and uvitex ® ob) were used to conduct the migration assays.
We present results from a new study of the effects of migration to the usa on the well-being of transnational families in high emigration communities within.
20 dec 2018 mathematical modeling of chemical migration from food packaging into low migration risk, or synthesizing plastic additives with low diffusivity.
Using a simple diffusion model to predict residual monomer migration—considerations and limitations.
Polymer additive migration to foods--a direct comparison of experimental data and values calculated from migration models for polypropylene.
Deterministic or mechanistic models mathematically describe the physico-chemical mechanisms underlying the phenomenon of migration. Various scientific studies have shown that the migration of chemicals from fcms into food follows predictable physical, and mathematically characterizable, processes.
The migration and segregation of a minor silicone containing additive in a multilayer, organic coating system has been investigated by x-ray photoelectron spectroscopy (xps) and time-of-flight secondary ion mass spectrometry (tof-sims). The silicone containing additive employed was the most compatible thermally stable, polyester.
Created by: migration models: probabilistic variability in migration model outputs as a result of the uncertainty in model inputs mixed effect models with deterministic models probability distribution of the diffusion coefficient using molecular mass distribution of outputs monte carlo sampling fourier amplitude sensitivity test (fast) latin.
Keywords migration, diffusion, additives, polymer, low density polyethylene, polymer swelling, fick, stochastic modelling the diffusion of small molecules from polymers into food is studied. A better understanding of this process is important for the development of mathematical models to predict migration from packaging plastics into food.
Citeseerx - document details (isaac councill, lee giles, pradeep teregowda): description of work: to analyse by means of mathematical and physical models the migration of additives and residual small chemical species from plastics into foods with which they are in contact.
The mathematical modeling of migration of additives from plastics to food simulants was studied using experimental data published in the literature, following two routes: the conventional approach.
3 may 2011 abstract the mathematical modeling of migration of additives from plastics to food simulants was studied using experimental data published.
The model presented hère can be used in a général case: ail diffusion coefficients dépend on thé simulant concentration in thé polymer at each time and at each.
Migration of chemical additives from polypropylene material to food simulants (50% ethanol solution and isooctane) at the temperature of 293, 313 and 343 k are investigated by using molecular dynamics (md) simulation technique based on the classical mechanics. A two-phase md model is firstly established to simulate the migration dynamic process.
This paper explores the impacts of the hiv/aids epidemic on children and families in northern tanzania using the concept of social resilience.
22 dec 2016 ion migration has been related to hysteresis in perovskite solar cells, but not the viability of the ion transport model for explaining hysteresis because the at the perovskite/spiro-ometad interface with alternati.
22 oct 2020 models describing the mass transfer of additives and other con-. Taminants has not been used to model migration from packaging.
Item type: student project report additional information: most of the restricted substances still have no analytical method for the determination of their migration levels, mathematical models are of great interest since they are able to predict migration of additives and other low molecular components from plastic packaging materials.
Migration modelling as a tool can be used in many different situations. Some of the most typical usages of the tool are: compliance studies: according to the jrc guideline on migration modelling, it is legally acceptable to use migration modelling in order to prove compliance with a specific migration limit.
20 sep 2018 because the safety standard is the same for all food additives, whether subject to the one simple approach to modeling migration for specific.
Migration results that are more refined than other worst-case scenario approaches. Integration of the migration model with datasets containing information on chemicals’ concentrations and physical properties derived from laboratory analyses.
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