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plastic food packaging materials  additive  migration simulation , relationresultegion )  the center  layer and an outer layer of  migration  ,some  assumptions of the  transfer  parameters are shown in table 1  .
table 1  evaluation of reversemigration  parameter value tab.1parametersforestimationofreversemigration*  :that  the value 40  .c  in  some assumptions of  swelling  conditions,  bht from the  center  layer and an outer layer  to the  alcohol  migration  output  ,see figure 5  .
can see,  using the established  simulation model  can facilitate the study of  some  mixed boundary conditions  on migration of additives  ,make up the existing  analytical  model  with  experimental study  ,compared  ,save time  ,abercrombie deutschland,reduce costs  .
5  theapplication of  finite element method  to establish the  mathematical  model is able to predict  the migration process of  multilayer  structure  .calculation  model gives  food packaging  migration  method to solve the problem  ,not only  1010080604o2oo figure 540℃under the assumption that theswelling  under the conditions of bht  to  fig.
5outputforbhtmigrationwithassumptionofswellingtoethanolat40  ℃alcoholmigration  can be used for  the same material and  multilayer  structure  ,replica mac cosmetics,and  can be used for different  kinds of materials  .if  some  parameters related to the  show  ,can simulate any  laminated  or composite  extrusion structure of  film in the  migration of additives  .
furthermore  ,this model can simulate the  mixing and  irregular  boundary conditions  of  additive migration  behavior  .this model  became the  determining  additives from plastics packaging materials to food  the migration of an  effective  utility  ,expand the  migration  method  .
  yuan zhenhua  . food packaging  materials  chemical  to  food  migration and    zhejiang journal of preventive medicine,  1999,,zeddamchafia  ,ecco skor,  ,2002180:191,1999118(2- 3):227  zhu yong  ,ugg online,wang zhiwei.
  recycled plastic  migration of pollutant in  finite element    packaging engineering  ,2005,26(5):88  ,  ,2003,16:107,,franzr  ,  --  rundschau  ,2003,90:137 ～,co1omboi  ,lapasinr.experimentaldetermi  - nationofthetheophyllinediffusioncoefficientinswollensodi  -  um    ,2001,76:93,,geddeuw.
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